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gerrit.cesnet.cz / github / CESNET / libyang / 6a044b2f43008de5eec6896268eab601220241b8 / . / src / xpath.c
blob: 38489eead8ae6e713ec6f53dd359584575eae528 [file] [log] [blame]
/**
* @file xpath.c
* @author Michal Vasko <mvasko@cesnet.cz>
* @brief YANG XPath evaluation functions
*
* Copyright (c) 2015 - 2019 CESNET, z.s.p.o.
*
* This source code is licensed under BSD 3-Clause License (the "License").
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSD-3-Clause
*/
#define _GNU_SOURCE
/* needed by libmath functions isfinite(), isinf(), isnan(), signbit(), ... */
#define _ISOC99_SOURCE
#include "common.h"
#include <math.h>
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "xpath.h"
#include "dict.h"
#include "xml.h"
#include "printer_data.h"
#include "tree_schema_internal.h"
#include "plugins_types.h"
static LY_ERR reparse_or_expr(struct ly_ctx *ctx, struct lyxp_expr *exp, uint16_t *exp_idx);
static LY_ERR eval_expr_select(struct lyxp_expr *exp, uint16_t *exp_idx, enum lyxp_expr_type etype, struct lyxp_set *set, int options);
/**
* @brief Print the type of an XPath \p set.
*
* @param[in] set Set to use.
* @return Set type string.
*/
static const char *
print_set_type(struct lyxp_set *set)
{
switch (set->type) {
case LYXP_SET_EMPTY:
return "empty";
case LYXP_SET_NODE_SET:
return "node set";
case LYXP_SET_SCNODE_SET:
return "schema node set";
case LYXP_SET_BOOLEAN:
return "boolean";
case LYXP_SET_NUMBER:
return "number";
case LYXP_SET_STRING:
return "string";
}
return NULL;
}
/**
* @brief Print an XPath token \p tok type.
*
* @param[in] tok Token to use.
* @return Token type string.
*/
static const char *
print_token(enum lyxp_token tok)
{
switch (tok) {
case LYXP_TOKEN_PAR1:
return "(";
case LYXP_TOKEN_PAR2:
return ")";
case LYXP_TOKEN_BRACK1:
return "[";
case LYXP_TOKEN_BRACK2:
return "]";
case LYXP_TOKEN_DOT:
return ".";
case LYXP_TOKEN_DDOT:
return "..";
case LYXP_TOKEN_AT:
return "@";
case LYXP_TOKEN_COMMA:
return ",";
case LYXP_TOKEN_NAMETEST:
return "NameTest";
case LYXP_TOKEN_NODETYPE:
return "NodeType";
case LYXP_TOKEN_FUNCNAME:
return "FunctionName";
case LYXP_TOKEN_OPERATOR_LOG:
return "Operator(Logic)";
case LYXP_TOKEN_OPERATOR_COMP:
return "Operator(Comparison)";
case LYXP_TOKEN_OPERATOR_MATH:
return "Operator(Math)";
case LYXP_TOKEN_OPERATOR_UNI:
return "Operator(Union)";
case LYXP_TOKEN_OPERATOR_PATH:
return "Operator(Path)";
case LYXP_TOKEN_LITERAL:
return "Literal";
case LYXP_TOKEN_NUMBER:
return "Number";
default:
LOGINT(NULL);
return "";
}
}
/**
* @brief Print the whole expression \p exp to debug output.
*
* @param[in] exp Expression to use.
*/
static void
print_expr_struct_debug(struct lyxp_expr *exp)
{
uint16_t i, j;
char tmp[128];
if (!exp || (ly_log_level < LY_LLDBG)) {
return;
}
LOGDBG(LY_LDGXPATH, "expression \"%s\":", exp->expr);
for (i = 0; i < exp->used; ++i) {
sprintf(tmp, "\ttoken %s, in expression \"%.*s\"", print_token(exp->tokens[i]), exp->tok_len[i],
&exp->expr[exp->tok_pos[i]]);
if (exp->repeat[i]) {
sprintf(tmp + strlen(tmp), " (repeat %d", exp->repeat[i][0]);
for (j = 1; exp->repeat[i][j]; ++j) {
sprintf(tmp + strlen(tmp), ", %d", exp->repeat[i][j]);
}
strcat(tmp, ")");
}
LOGDBG(LY_LDGXPATH, tmp);
}
}
#ifndef NDEBUG
/**
* @brief Print XPath set content to debug output.
*
* @param[in] set Set to print.
*/
static void
print_set_debug(struct lyxp_set *set)
{
uint32_t i;
char *str;
int dynamic;
struct lyxp_set_node *item;
struct lyxp_set_scnode *sitem;
if (ly_log_level < LY_LLDBG) {
return;
}
switch (set->type) {
case LYXP_SET_NODE_SET:
LOGDBG(LY_LDGXPATH, "set NODE SET:");
for (i = 0; i < set->used; ++i) {
item = &set->val.nodes[i];
switch (item->type) {
case LYXP_NODE_NONE:
LOGDBG(LY_LDGXPATH, "\t%d (pos %u): NONE", i + 1, item->pos);
break;
case LYXP_NODE_ROOT:
LOGDBG(LY_LDGXPATH, "\t%d (pos %u): ROOT", i + 1, item->pos);
break;
case LYXP_NODE_ROOT_CONFIG:
LOGDBG(LY_LDGXPATH, "\t%d (pos %u): ROOT CONFIG", i + 1, item->pos);
break;
case LYXP_NODE_ELEM:
if ((item->node->schema->nodetype == LYS_LIST)
&& (((struct lyd_node_inner *)item->node)->child->schema->nodetype == LYS_LEAF)) {
LOGDBG(LY_LDGXPATH, "\t%d (pos %u): ELEM %s (1st child val: %s)", i + 1, item->pos,
item->node->schema->name,
(str = (char *)lyd_value2str((struct lyd_node_term *)lyd_node_children(item->node), &dynamic)));
if (dynamic) {
free(str);
}
} else if (((struct lyd_node_inner *)item->node)->schema->nodetype == LYS_LEAFLIST) {
LOGDBG(LY_LDGXPATH, "\t%d (pos %u): ELEM %s (val: %s)", i + 1, item->pos,
item->node->schema->name,
(str = (char *)lyd_value2str((struct lyd_node_term *)item->node, &dynamic)));
if (dynamic) {
free(str);
}
} else {
LOGDBG(LY_LDGXPATH, "\t%d (pos %u): ELEM %s", i + 1, item->pos, item->node->schema->name);
}
break;
case LYXP_NODE_TEXT:
if (item->node->schema->nodetype & LYS_ANYDATA) {
LOGDBG(LY_LDGXPATH, "\t%d (pos %u): TEXT <%s>", i + 1, item->pos,
item->node->schema->nodetype == LYS_ANYXML ? "anyxml" : "anydata");
} else {
LOGDBG(LY_LDGXPATH, "\t%d (pos %u): TEXT %s", i + 1, item->pos,
(str = (char *)lyd_value2str((struct lyd_node_term *)item->node, &dynamic)));
if (dynamic) {
free(str);
}
}
break;
case LYXP_NODE_ATTR:
LOGDBG(LY_LDGXPATH, "\t%d (pos %u): ATTR %s = %s", i + 1, item->pos, set->val.attrs[i].attr->name,
set->val.attrs[i].attr->value);
break;
}
}
break;
case LYXP_SET_SCNODE_SET:
LOGDBG(LY_LDGXPATH, "set SCNODE SET:");
for (i = 0; i < set->used; ++i) {
sitem = &set->val.scnodes[i];
switch (sitem->type) {
case LYXP_NODE_ROOT:
LOGDBG(LY_LDGXPATH, "\t%d (%u): ROOT", i + 1, sitem->in_ctx);
break;
case LYXP_NODE_ROOT_CONFIG:
LOGDBG(LY_LDGXPATH, "\t%d (%u): ROOT CONFIG", i + 1, sitem->in_ctx);
break;
case LYXP_NODE_ELEM:
LOGDBG(LY_LDGXPATH, "\t%d (%u): ELEM %s", i + 1, sitem->in_ctx, sitem->scnode->name);
break;
default:
LOGINT(NULL);
break;
}
}
break;
case LYXP_SET_EMPTY:
LOGDBG(LY_LDGXPATH, "set EMPTY");
break;
case LYXP_SET_BOOLEAN:
LOGDBG(LY_LDGXPATH, "set BOOLEAN");
LOGDBG(LY_LDGXPATH, "\t%s", (set->val.bool ? "true" : "false"));
break;
case LYXP_SET_STRING:
LOGDBG(LY_LDGXPATH, "set STRING");
LOGDBG(LY_LDGXPATH, "\t%s", set->val.str);
break;
case LYXP_SET_NUMBER:
LOGDBG(LY_LDGXPATH, "set NUMBER");
if (isnan(set->val.num)) {
str = strdup("NaN");
} else if ((set->val.num == 0) || (set->val.num == -0.0f)) {
str = strdup("0");
} else if (isinf(set->val.num) && !signbit(set->val.num)) {
str = strdup("Infinity");
} else if (isinf(set->val.num) && signbit(set->val.num)) {
str = strdup("-Infinity");
} else if ((long long)set->val.num == set->val.num) {
if (asprintf(&str, "%lld", (long long)set->val.num) == -1) {
str = NULL;
}
} else {
if (asprintf(&str, "%03.1Lf", set->val.num) == -1) {
str = NULL;
}
}
LY_CHECK_ERR_RET(!str, LOGMEM(NULL), );
LOGDBG(LY_LDGXPATH, "\t%s", str);
free(str);
}
}
#endif
/**
* @brief Realloc the string \p str.
*
* @param[in] ctx libyang context for logging.
* @param[in] needed How much free space is required.
* @param[in,out] str Pointer to the string to use.
* @param[in,out] used Used bytes in \p str.
* @param[in,out] size Allocated bytes in \p str.
* @return LY_ERR
*/
static LY_ERR
cast_string_realloc(struct ly_ctx *ctx, uint16_t needed, char **str, uint16_t *used, uint16_t *size)
{
if (*size - *used < needed) {
do {
if ((UINT16_MAX - *size) < LYXP_STRING_CAST_SIZE_STEP) {
LOGERR(ctx, LY_EINVAL, "XPath string length limit (%u) reached.", UINT16_MAX);
return LY_EINVAL;
}
*size += LYXP_STRING_CAST_SIZE_STEP;
} while (*size - *used < needed);
*str = ly_realloc(*str, *size * sizeof(char));
LY_CHECK_ERR_RET(!(*str), LOGMEM(ctx), LY_EMEM);
}
return LY_SUCCESS;
}
/**
* @brief Cast nodes recursively to one string @p str.
*
* @param[in] node Node to cast.
* @param[in] fake_cont Whether to put the data into a "fake" container.
* @param[in] root_type Type of the XPath root.
* @param[in] indent Current indent.
* @param[in,out] str Resulting string.
* @param[in,out] used Used bytes in @p str.
* @param[in,out] size Allocated bytes in @p str.
* @return LY_ERR
*/
static LY_ERR
cast_string_recursive(const struct lyd_node *node, int fake_cont, enum lyxp_node_type root_type, uint16_t indent, char **str,
uint16_t *used, uint16_t *size)
{
char *buf, *line, *ptr;
const char *value_str;
int dynamic;
const struct lyd_node *child;
struct lyd_node_any *any;
LY_ERR rc;
if ((root_type == LYXP_NODE_ROOT_CONFIG) && (node->schema->flags & LYS_CONFIG_R)) {
return LY_SUCCESS;
}
if (fake_cont) {
rc = cast_string_realloc(LYD_NODE_CTX(node), 1, str, used, size);
LY_CHECK_RET(rc);
strcpy(*str + (*used - 1), "\n");
++(*used);
++indent;
}
switch (node->schema->nodetype) {
case LYS_CONTAINER:
case LYS_LIST:
case LYS_RPC:
case LYS_NOTIF:
rc = cast_string_realloc(LYD_NODE_CTX(node), 1, str, used, size);
LY_CHECK_RET(rc);
strcpy(*str + (*used - 1), "\n");
++(*used);
for (child = lyd_node_children(node); child; child = child->next) {
rc = cast_string_recursive(child, 0, root_type, indent + 1, str, used, size);
LY_CHECK_RET(rc);
}
break;
case LYS_LEAF:
case LYS_LEAFLIST:
value_str = lyd_value2str(((struct lyd_node_term *)node), &dynamic);
/* print indent */
rc = cast_string_realloc(LYD_NODE_CTX(node), indent * 2 + strlen(value_str) + 1, str, used, size);
if (rc != LY_SUCCESS) {
if (dynamic) {
free((char *)value_str);
}
return rc;
}
memset(*str + (*used - 1), ' ', indent * 2);
*used += indent * 2;
/* print value */
if (*used == 1) {
sprintf(*str + (*used - 1), "%s", value_str);
*used += strlen(value_str);
} else {
sprintf(*str + (*used - 1), "%s\n", value_str);
*used += strlen(value_str) + 1;
}
if (dynamic) {
free((char *)value_str);
}
break;
case LYS_ANYXML:
case LYS_ANYDATA:
any = (struct lyd_node_any *)node;
if (!(void *)any->value.tree) {
/* no content */
buf = strdup("");
LY_CHECK_ERR_RET(!buf, LOGMEM(LYD_NODE_CTX(node)), LY_EMEM);
} else {
switch (any->value_type) {
case LYD_ANYDATA_STRING:
case LYD_ANYDATA_XML:
case LYD_ANYDATA_JSON:
buf = strdup(any->value.json);
LY_CHECK_ERR_RET(!buf, LOGMEM(LYD_NODE_CTX(node)), LY_EMEM);
break;
case LYD_ANYDATA_DATATREE:
rc = lyd_print_mem(&buf, any->value.tree, LYD_XML, LYDP_WITHSIBLINGS);
LY_CHECK_RET(rc);
break;
/* TODO case LYD_ANYDATA_LYB:
LOGERR(LYD_NODE_CTX(node), LY_EINVAL, "Cannot convert LYB anydata into string.");
return -1;*/
}
}
line = strtok_r(buf, "\n", &ptr);
do {
rc = cast_string_realloc(LYD_NODE_CTX(node), indent * 2 + strlen(line) + 1, str, used, size);
if (rc != LY_SUCCESS) {
free(buf);
return rc;
}
memset(*str + (*used - 1), ' ', indent * 2);
*used += indent * 2;
strcpy(*str + (*used - 1), line);
*used += strlen(line);
strcpy(*str + (*used - 1), "\n");
*used += 1;
} while ((line = strtok_r(NULL, "\n", &ptr)));
free(buf);
break;
default:
LOGINT_RET(LYD_NODE_CTX(node));
}
if (fake_cont) {
rc = cast_string_realloc(LYD_NODE_CTX(node), 1, str, used, size);
LY_CHECK_RET(rc);
strcpy(*str + (*used - 1), "\n");
++(*used);
--indent;
}
return LY_SUCCESS;
}
/**
* @brief Cast an element into a string.
*
* @param[in] node Node to cast.
* @param[in] fake_cont Whether to put the data into a "fake" container.
* @param[in] root_type Type of the XPath root.
* @param[out] str Element cast to dynamically-allocated string.
* @return LY_ERR
*/
static LY_ERR
cast_string_elem(struct lyd_node *node, int fake_cont, enum lyxp_node_type root_type, char **str)
{
uint16_t used, size;
LY_ERR rc;
*str = malloc(LYXP_STRING_CAST_SIZE_START * sizeof(char));
LY_CHECK_ERR_RET(!*str, LOGMEM(LYD_NODE_CTX(node)), LY_EMEM);
(*str)[0] = '\0';
used = 1;
size = LYXP_STRING_CAST_SIZE_START;
rc = cast_string_recursive(node, fake_cont, root_type, 0, str, &used, &size);
if (rc != LY_SUCCESS) {
free(*str);
return rc;
}
if (size > used) {
*str = ly_realloc(*str, used * sizeof(char));
LY_CHECK_ERR_RET(!*str, LOGMEM(LYD_NODE_CTX(node)), LY_EMEM);
}
return LY_SUCCESS;
}
/**
* @brief Cast a LYXP_SET_NODE_SET set into a string.
* Context position aware.
*
* @param[in] set Set to cast.
* @param[out] str Cast dynamically-allocated string.
* @return LY_ERR
*/
static LY_ERR
cast_node_set_to_string(struct lyxp_set *set, char **str)
{
int dynamic;
switch (set->val.nodes[0].type) {
case LYXP_NODE_NONE:
/* invalid */
LOGINT_RET(set->ctx);
case LYXP_NODE_ROOT:
case LYXP_NODE_ROOT_CONFIG:
return cast_string_elem(set->val.nodes[0].node, 1, set->root_type, str);
case LYXP_NODE_ELEM:
case LYXP_NODE_TEXT:
return cast_string_elem(set->val.nodes[0].node, 0, set->root_type, str);
case LYXP_NODE_ATTR:
*str = (char *)lyd_attr2str(set->val.attrs[0].attr, &dynamic);
if (!dynamic) {
*str = strdup(*str);
if (!*str) {
LOGMEM_RET(set->ctx);
}
}
return LY_SUCCESS;
}
LOGINT_RET(set->ctx);
}
/**
* @brief Cast a string into an XPath number.
*
* @param[in] str String to use.
* @return Cast number.
*/
static long double
cast_string_to_number(const char *str)
{
long double num;
char *ptr;
errno = 0;
num = strtold(str, &ptr);
if (errno || *ptr) {
num = NAN;
}
return num;
}
/**
* @brief Callback for checking value equality.
*
* @param[in] val1_p First value.
* @param[in] val2_p Second value.
* @param[in] mod Whether hash table is being modified.
* @param[in] cb_data Callback data.
* @return 0 if not equal, non-zero if equal.
*/
static int
set_values_equal_cb(void *val1_p, void *val2_p, int UNUSED(mod), void *UNUSED(cb_data))
{
struct lyxp_set_hash_node *val1, *val2;
val1 = (struct lyxp_set_hash_node *)val1_p;
val2 = (struct lyxp_set_hash_node *)val2_p;
if ((val1->node == val2->node) && (val1->type == val2->type)) {
return 1;
}
return 0;
}
/**
* @brief Insert node and its hash into set.
*
* @param[in] set et to insert to.
* @param[in] node Node with hash.
* @param[in] type Node type.
*/
static void
set_insert_node_hash(struct lyxp_set *set, struct lyd_node *node, enum lyxp_node_type type)
{
int r;
uint32_t i, hash;
struct lyxp_set_hash_node hnode;
if (!set->ht && (set->used >= LYD_HT_MIN_ITEMS)) {
/* create hash table and add all the nodes */
set->ht = lyht_new(1, sizeof(struct lyxp_set_hash_node), set_values_equal_cb, NULL, 1);
for (i = 0; i < set->used; ++i) {
hnode.node = set->val.nodes[i].node;
hnode.type = set->val.nodes[i].type;
hash = dict_hash_multi(0, (const char *)&hnode.node, sizeof hnode.node);
hash = dict_hash_multi(hash, (const char *)&hnode.type, sizeof hnode.type);
hash = dict_hash_multi(hash, NULL, 0);
r = lyht_insert(set->ht, &hnode, hash, NULL);
assert(!r);
(void)r;
if (hnode.node == node) {
/* it was just added, do not add it twice */
node = NULL;
}
}
}
if (set->ht && node) {
/* add the new node into hash table */
hnode.node = node;
hnode.type = type;
hash = dict_hash_multi(0, (const char *)&hnode.node, sizeof hnode.node);
hash = dict_hash_multi(hash, (const char *)&hnode.type, sizeof hnode.type);
hash = dict_hash_multi(hash, NULL, 0);
r = lyht_insert(set->ht, &hnode, hash, NULL);
assert(!r);
(void)r;
}
}
/**
* @brief Remove node and its hash from set.
*
* @param[in] set Set to remove from.
* @param[in] node Node to remove.
* @param[in] type Node type.
*/
static void
set_remove_node_hash(struct lyxp_set *set, struct lyd_node *node, enum lyxp_node_type type)
{
int r;
struct lyxp_set_hash_node hnode;
uint32_t hash;
if (set->ht) {
hnode.node = node;
hnode.type = type;
hash = dict_hash_multi(0, (const char *)&hnode.node, sizeof hnode.node);
hash = dict_hash_multi(hash, (const char *)&hnode.type, sizeof hnode.type);
hash = dict_hash_multi(hash, NULL, 0);
r = lyht_remove(set->ht, &hnode, hash);
assert(!r);
(void)r;
if (!set->ht->used) {
lyht_free(set->ht);
set->ht = NULL;
}
}
}
/**
* @brief Check whether node is in set based on its hash.
*
* @param[in] set Set to search in.
* @param[in] node Node to search for.
* @param[in] type Node type.
* @param[in] skip_idx Index in @p set to skip.
* @return LY_ERR
*/
static LY_ERR
set_dup_node_hash_check(const struct lyxp_set *set, struct lyd_node *node, enum lyxp_node_type type, int skip_idx)
{
struct lyxp_set_hash_node hnode, *match_p;
uint32_t hash;
hnode.node = node;
hnode.type = type;
hash = dict_hash_multi(0, (const char *)&hnode.node, sizeof hnode.node);
hash = dict_hash_multi(hash, (const char *)&hnode.type, sizeof hnode.type);
hash = dict_hash_multi(hash, NULL, 0);
if (!lyht_find(set->ht, &hnode, hash, (void **)&match_p)) {
if ((skip_idx > -1) && (set->val.nodes[skip_idx].node == match_p->node) && (set->val.nodes[skip_idx].type == match_p->type)) {
/* we found it on the index that should be skipped, find another */
hnode = *match_p;
if (lyht_find_next(set->ht, &hnode, hash, (void **)&match_p)) {
/* none other found */
return LY_SUCCESS;
}
}
return LY_EEXIST;
}
/* not found */
return LY_SUCCESS;
}
/**
* @brief Free dynamic content of a set.
*
* @param[in] set Set to modify.
*/
static void
set_free_content(struct lyxp_set *set)
{
if (!set) {
return;
}
if (set->type == LYXP_SET_NODE_SET) {
free(set->val.nodes);
lyht_free(set->ht);
set->ht = NULL;
} else if (set->type == LYXP_SET_SCNODE_SET) {
free(set->val.scnodes);
} else if (set->type == LYXP_SET_STRING) {
free(set->val.str);
}
set->type = LYXP_SET_EMPTY;
}
/**
* @brief Free dynamically-allocated set.
*
* @param[in] set Set to free.
*/
static void
lyxp_set_free(struct lyxp_set *set)
{
if (!set) {
return;
}
set_free_content(set);
free(set);
}
/**
* @brief Initialize set context.
*
* @param[in] new Set to initialize.
* @param[in] set Arbitrary initialized set.
*/
static void
set_init(struct lyxp_set *new, struct lyxp_set *set)
{
memset(new, 0, sizeof *new);
if (set) {
new->ctx = set->ctx;
new->ctx_node = set->ctx_node;
new->root_type = set->root_type;
new->local_mod = set->local_mod;
new->trees = set->trees;
new->format = set->format;
}
}
/**
* @brief Create a deep copy of a set.
*
* @param[in] set Set to copy.
* @return Copy of @p set.
*/
static struct lyxp_set *
set_copy(struct lyxp_set *set)
{
struct lyxp_set *ret;
uint16_t i;
int idx;
if (!set) {
return NULL;
}
ret = malloc(sizeof *ret);
LY_CHECK_ERR_RET(!ret, LOGMEM(set->ctx), NULL);
set_init(ret, set);
if (set->type == LYXP_SET_SCNODE_SET) {
ret->type = set->type;
for (i = 0; i < set->used; ++i) {
if ((set->val.scnodes[i].in_ctx == 1) || (set->val.scnodes[i].in_ctx == -2)) {
idx = lyxp_set_scnode_insert_node(ret, set->val.scnodes[i].scnode, set->val.scnodes[i].type);
/* coverity seems to think scnodes can be NULL */
if ((idx == -1) || !ret->val.scnodes) {
lyxp_set_free(ret);
return NULL;
}
ret->val.scnodes[idx].in_ctx = set->val.scnodes[i].in_ctx;
}
}
} else if (set->type == LYXP_SET_NODE_SET) {
ret->type = set->type;
ret->val.nodes = malloc(set->used * sizeof *ret->val.nodes);
LY_CHECK_ERR_RET(!ret->val.nodes, LOGMEM(set->ctx); free(ret), NULL);
memcpy(ret->val.nodes, set->val.nodes, set->used * sizeof *ret->val.nodes);
ret->used = ret->size = set->used;
ret->ctx_pos = set->ctx_pos;
ret->ctx_size = set->ctx_size;
ret->ht = lyht_dup(set->ht);
} else {
memcpy(ret, set, sizeof *ret);
if (set->type == LYXP_SET_STRING) {
ret->val.str = strdup(set->val.str);
LY_CHECK_ERR_RET(!ret->val.str, LOGMEM(set->ctx); free(ret), NULL);
}
}
return ret;
}
/**
* @brief Fill XPath set with a string. Any current data are disposed of.
*
* @param[in] set Set to fill.
* @param[in] string String to fill into \p set.
* @param[in] str_len Length of \p string. 0 is a valid value!
*/
static void
set_fill_string(struct lyxp_set *set, const char *string, uint16_t str_len)
{
set_free_content(set);
set->type = LYXP_SET_STRING;
if ((str_len == 0) && (string[0] != '\0')) {
string = "";
}
set->val.str = strndup(string, str_len);
}
/**
* @brief Fill XPath set with a number. Any current data are disposed of.
*
* @param[in] set Set to fill.
* @param[in] number Number to fill into \p set.
*/
static void
set_fill_number(struct lyxp_set *set, long double number)
{
set_free_content(set);
set->type = LYXP_SET_NUMBER;
set->val.num = number;
}
/**
* @brief Fill XPath set with a boolean. Any current data are disposed of.
*
* @param[in] set Set to fill.
* @param[in] boolean Boolean to fill into \p set.
*/
static void
set_fill_boolean(struct lyxp_set *set, int boolean)
{
set_free_content(set);
set->type = LYXP_SET_BOOLEAN;
set->val.bool = boolean;
}
/**
* @brief Fill XPath set with the value from another set (deep assign).
* Any current data are disposed of.
*
* @param[in] trg Set to fill.
* @param[in] src Source set to copy into \p trg.
*/
static void
set_fill_set(struct lyxp_set *trg, struct lyxp_set *src)
{
if (!trg || !src) {
return;
}
if (trg->type == LYXP_SET_NODE_SET) {
free(trg->val.nodes);
} else if (trg->type == LYXP_SET_STRING) {
free(trg->val.str);
}
set_init(trg, src);
if (src->type == LYXP_SET_SCNODE_SET) {
trg->type = LYXP_SET_SCNODE_SET;
trg->used = src->used;
trg->size = src->used;
trg->val.scnodes = ly_realloc(trg->val.scnodes, trg->size * sizeof *trg->val.scnodes);
LY_CHECK_ERR_RET(!trg->val.scnodes, LOGMEM(src->ctx); memset(trg, 0, sizeof *trg), );
memcpy(trg->val.scnodes, src->val.scnodes, src->used * sizeof *src->val.scnodes);
} else if (src->type == LYXP_SET_BOOLEAN) {
set_fill_boolean(trg, src->val.bool);
} else if (src->type == LYXP_SET_NUMBER) {
set_fill_number(trg, src->val.num);
} else if (src->type == LYXP_SET_STRING) {
set_fill_string(trg, src->val.str, strlen(src->val.str));
} else {
if (trg->type == LYXP_SET_NODE_SET) {
free(trg->val.nodes);
} else if (trg->type == LYXP_SET_STRING) {
free(trg->val.str);
}
if (src->type == LYXP_SET_EMPTY) {
trg->type = LYXP_SET_EMPTY;
} else {
assert(src->type == LYXP_SET_NODE_SET);
trg->type = LYXP_SET_NODE_SET;
trg->used = src->used;
trg->size = src->used;
trg->ctx_pos = src->ctx_pos;
trg->ctx_size = src->ctx_size;
trg->val.nodes = malloc(trg->used * sizeof *trg->val.nodes);
LY_CHECK_ERR_RET(!trg->val.nodes, LOGMEM(src->ctx); memset(trg, 0, sizeof *trg), );
memcpy(trg->val.nodes, src->val.nodes, src->used * sizeof *src->val.nodes);
trg->ht = lyht_dup(src->ht);
}
}
}
/**
* @brief Clear context of all schema nodes.
*
* @param[in] set Set to clear.
*/
static void
set_scnode_clear_ctx(struct lyxp_set *set)
{
uint32_t i;
for (i = 0; i < set->used; ++i) {
if (set->val.scnodes[i].in_ctx == 1) {
set->val.scnodes[i].in_ctx = 0;
} else if (set->val.scnodes[i].in_ctx == -2) {
set->val.scnodes[i].in_ctx = -1;
}
}
}
/**
* @brief Remove a node from a set. Removing last node changes
* set into LYXP_SET_EMPTY. Context position aware.
*
* @param[in] set Set to use.
* @param[in] idx Index from @p set of the node to be removed.
*/
static void
set_remove_node(struct lyxp_set *set, uint32_t idx)
{
assert(set && (set->type == LYXP_SET_NODE_SET));
assert(idx < set->used);
set_remove_node_hash(set, set->val.nodes[idx].node, set->val.nodes[idx].type);
--set->used;
if (set->used) {
memmove(&set->val.nodes[idx], &set->val.nodes[idx + 1],
(set->used - idx) * sizeof *set->val.nodes);
} else {
set_free_content(set);
set->type = LYXP_SET_EMPTY;
}
}
/**
* @brief Remove a node from a set by setting its type to LYXP_NODE_NONE.
*
* @param[in] set Set to use.
* @param[in] idx Index from @p set of the node to be removed.
*/
static void
set_remove_node_none(struct lyxp_set *set, uint32_t idx)
{
assert(set && (set->type == LYXP_SET_NODE_SET));
assert(idx < set->used);
if (set->val.nodes[idx].type == LYXP_NODE_ELEM) {
set_remove_node_hash(set, set->val.nodes[idx].node, set->val.nodes[idx].type);
}
set->val.nodes[idx].type = LYXP_NODE_NONE;
}
/**
* @brief Remove all LYXP_NODE_NONE nodes from a set. Removing last node changes
* set into LYXP_SET_EMPTY. Context position aware.
*
* @param[in] set Set to consolidate.
*/
static void
set_remove_nodes_none(struct lyxp_set *set)
{
uint16_t i, orig_used, end;
int32_t start;
assert(set && (set->type != LYXP_SET_EMPTY));
orig_used = set->used;
set->used = 0;
for (i = 0; i < orig_used;) {
start = -1;
do {
if ((set->val.nodes[i].type != LYXP_NODE_NONE) && (start == -1)) {
start = i;
} else if ((start > -1) && (set->val.nodes[i].type == LYXP_NODE_NONE)) {
end = i;
++i;
break;
}
++i;
if (i == orig_used) {
end = i;
}
} while (i < orig_used);
if (start > -1) {
/* move the whole chunk of valid nodes together */
if (set->used != (unsigned)start) {
memmove(&set->val.nodes[set->used], &set->val.nodes[start], (end - start) * sizeof *set->val.nodes);
}
set->used += end - start;
}
}
if (!set->used) {
set_free_content(set);
/* this changes it to LYXP_SET_EMPTY */
memset(set, 0, sizeof *set);
}
}
/**
* @brief Check for duplicates in a node set.
*
* @param[in] set Set to check.
* @param[in] node Node to look for in @p set.
* @param[in] node_type Type of @p node.
* @param[in] skip_idx Index from @p set to skip.
* @return LY_ERR
*/
static LY_ERR
set_dup_node_check(const struct lyxp_set *set, const struct lyd_node *node, enum lyxp_node_type node_type, int skip_idx)
{
uint32_t i;
if (set->ht && node) {
return set_dup_node_hash_check(set, (struct lyd_node *)node, node_type, skip_idx);
}
for (i = 0; i < set->used; ++i) {
if ((skip_idx > -1) && (i == (unsigned)skip_idx)) {
continue;
}
if ((set->val.nodes[i].node == node) && (set->val.nodes[i].type == node_type)) {
return LY_EEXIST;
}
}
return LY_SUCCESS;
}
int
lyxp_set_scnode_dup_node_check(struct lyxp_set *set, const struct lysc_node *node, enum lyxp_node_type node_type, int skip_idx)
{
uint32_t i;
for (i = 0; i < set->used; ++i) {
if ((skip_idx > -1) && (i == (unsigned)skip_idx)) {
continue;
}
if ((set->val.scnodes[i].scnode == node) && (set->val.scnodes[i].type == node_type)) {
return i;
}
}
return -1;
}
void
lyxp_set_scnode_merge(struct lyxp_set *set1, struct lyxp_set *set2)
{
uint32_t orig_used, i, j;
assert(((set1->type == LYXP_SET_SCNODE_SET) || (set1->type == LYXP_SET_EMPTY))
&& ((set2->type == LYXP_SET_SCNODE_SET) || (set2->type == LYXP_SET_EMPTY)));
if (set2->type == LYXP_SET_EMPTY) {
return;
}
if (set1->type == LYXP_SET_EMPTY) {
memcpy(set1, set2, sizeof *set1);
return;
}
if (set1->used + set2->used > set1->size) {
set1->size = set1->used + set2->used;
set1->val.scnodes = ly_realloc(set1->val.scnodes, set1->size * sizeof *set1->val.scnodes);
LY_CHECK_ERR_RET(!set1->val.scnodes, LOGMEM(set1->ctx), );
}
orig_used = set1->used;
for (i = 0; i < set2->used; ++i) {
for (j = 0; j < orig_used; ++j) {
/* detect duplicities */
if (set1->val.scnodes[j].scnode == set2->val.scnodes[i].scnode) {
break;
}
}
if (j == orig_used) {
memcpy(&set1->val.scnodes[set1->used], &set2->val.scnodes[i], sizeof *set2->val.scnodes);
++set1->used;
}
}
set_free_content(set2);
set2->type = LYXP_SET_EMPTY;
}
/**
* @brief Insert a node into a set. Context position aware.
*
* @param[in] set Set to use.
* @param[in] node Node to insert to @p set.
* @param[in] pos Sort position of @p node. If left 0, it is filled just before sorting.
* @param[in] node_type Node type of @p node.
* @param[in] idx Index in @p set to insert into.
*/
static void
set_insert_node(struct lyxp_set *set, const struct lyd_node *node, uint32_t pos, enum lyxp_node_type node_type, uint32_t idx)
{
assert(set && ((set->type == LYXP_SET_NODE_SET) || (set->type == LYXP_SET_EMPTY)));
if (set->type == LYXP_SET_EMPTY) {
/* first item */
if (idx) {
/* no real harm done, but it is a bug */
LOGINT(set->ctx);
idx = 0;
}
set->val.nodes = malloc(LYXP_SET_SIZE_START * sizeof *set->val.nodes);
LY_CHECK_ERR_RET(!set->val.nodes, LOGMEM(set->ctx), );
set->type = LYXP_SET_NODE_SET;
set->used = 0;
set->size = LYXP_SET_SIZE_START;
set->ctx_pos = 1;
set->ctx_size = 1;
set->ht = NULL;
} else {
/* not an empty set */
if (set->used == set->size) {
/* set is full */
set->val.nodes = ly_realloc(set->val.nodes, (set->size + LYXP_SET_SIZE_STEP) * sizeof *set->val.nodes);
LY_CHECK_ERR_RET(!set->val.nodes, LOGMEM(set->ctx), );
set->size += LYXP_SET_SIZE_STEP;
}
if (idx > set->used) {
LOGINT(set->ctx);
idx = set->used;
}
/* make space for the new node */
if (idx < set->used) {
memmove(&set->val.nodes[idx + 1], &set->val.nodes[idx], (set->used - idx) * sizeof *set->val.nodes);
}
}
/* finally assign the value */
set->val.nodes[idx].node = (struct lyd_node *)node;
set->val.nodes[idx].type = node_type;
set->val.nodes[idx].pos = pos;
++set->used;
if (set->val.nodes[idx].type == LYXP_NODE_ELEM) {
set_insert_node_hash(set, (struct lyd_node *)node, node_type);
}
}
int
lyxp_set_scnode_insert_node(struct lyxp_set *set, const struct lysc_node *node, enum lyxp_node_type node_type)
{
int ret;
assert(set->type == LYXP_SET_SCNODE_SET);
ret = lyxp_set_scnode_dup_node_check(set, node, node_type, -1);
if (ret > -1) {
set->val.scnodes[ret].in_ctx = 1;
} else {
if (set->used == set->size) {
set->val.scnodes = ly_realloc(set->val.scnodes, (set->size + LYXP_SET_SIZE_STEP) * sizeof *set->val.scnodes);
LY_CHECK_ERR_RET(!set->val.scnodes, LOGMEM(set->ctx), -1);
set->size += LYXP_SET_SIZE_STEP;
}
ret = set->used;
set->val.scnodes[ret].scnode = (struct lysc_node *)node;
set->val.scnodes[ret].type = node_type;
set->val.scnodes[ret].in_ctx = 1;
++set->used;
}
return ret;
}
/**
* @brief Replace a node in a set with another. Context position aware.
*
* @param[in] set Set to use.
* @param[in] node Node to insert to @p set.
* @param[in] pos Sort position of @p node. If left 0, it is filled just before sorting.
* @param[in] node_type Node type of @p node.
* @param[in] idx Index in @p set of the node to replace.
*/
static void
set_replace_node(struct lyxp_set *set, const struct lyd_node *node, uint32_t pos, enum lyxp_node_type node_type, uint32_t idx)
{
assert(set && (idx < set->used));
if (set->val.nodes[idx].type == LYXP_NODE_ELEM) {
set_remove_node_hash(set, set->val.nodes[idx].node, set->val.nodes[idx].type);
}
set->val.nodes[idx].node = (struct lyd_node *)node;
set->val.nodes[idx].type = node_type;
set->val.nodes[idx].pos = pos;
if (set->val.nodes[idx].type == LYXP_NODE_ELEM) {
set_insert_node_hash(set, set->val.nodes[idx].node, set->val.nodes[idx].type);
}
}
/**
* @brief Set all nodes with ctx 1 to a new unique context value.
*
* @param[in] set Set to modify.
* @return New context value.
*/
static int32_t
set_scnode_new_in_ctx(struct lyxp_set *set)
{
uint32_t i;
int32_t ret_ctx;
assert(set->type == LYXP_SET_SCNODE_SET);
ret_ctx = 3;
retry:
for (i = 0; i < set->used; ++i) {
if (set->val.scnodes[i].in_ctx >= ret_ctx) {
ret_ctx = set->val.scnodes[i].in_ctx + 1;
goto retry;
}
}
for (i = 0; i < set->used; ++i) {
if (set->val.scnodes[i].in_ctx == 1) {
set->val.scnodes[i].in_ctx = ret_ctx;
}
}
return ret_ctx;
}
/**
* @brief Get unique @p node position in the data.
*
* @param[in] node Node to find.
* @param[in] node_type Node type of @p node.
* @param[in] root Root node.
* @param[in] root_type Type of the XPath @p root node.
* @param[in] prev Node that we think is before @p node in DFS from @p root. Can optionally
* be used to increase efficiency and start the DFS from this node.
* @param[in] prev_pos Node @p prev position. Optional, but must be set if @p prev is set.
* @return Node position.
*/
static uint32_t
get_node_pos(const struct lyd_node *node, enum lyxp_node_type node_type, const struct lyd_node *root,
enum lyxp_node_type root_type, const struct lyd_node **prev, uint32_t *prev_pos)
{
const struct lyd_node *next, *elem, *top_sibling;
uint32_t pos = 1;
assert(prev && prev_pos && !root->prev->next);
if ((node_type == LYXP_NODE_ROOT) || (node_type == LYXP_NODE_ROOT_CONFIG)) {
return 0;
}
if (*prev) {
/* start from the previous element instead from the root */
elem = next = *prev;
pos = *prev_pos;
for (top_sibling = elem; top_sibling->parent; top_sibling = (struct lyd_node *)top_sibling->parent);
goto dfs_search;
}
for (top_sibling = root; top_sibling; top_sibling = top_sibling->next) {
/* TREE DFS */
LYD_TREE_DFS_BEGIN(top_sibling, next, elem) {
dfs_search:
if ((root_type == LYXP_NODE_ROOT_CONFIG) && (elem->schema->flags & LYS_CONFIG_R)) {
goto skip_children;
}
if (elem == node) {
break;
}
++pos;
/* TREE DFS END */
/* select element for the next run - children first,
* child exception for lyd_node_leaf and lyd_node_leaflist, but not the root */
if (elem->schema->nodetype & (LYS_LEAF | LYS_LEAFLIST | LYS_ANYDATA)) {
next = NULL;
} else {
next = lyd_node_children(elem);
}
if (!next) {
skip_children:
/* no children */
if (elem == top_sibling) {
/* we are done, root has no children */
elem = NULL;
break;
}
/* try siblings */
next = elem->next;
}
while (!next) {
/* no siblings, go back through parents */
if (elem->parent == top_sibling->parent) {
/* we are done, no next element to process */
elem = NULL;
break;
}
/* parent is already processed, go to its sibling */
elem = (struct lyd_node *)elem->parent;
next = elem->next;
}
}
/* node found */
if (elem) {
break;
}
}
if (!elem) {
if (!(*prev)) {
/* we went from root and failed to find it, cannot be */
LOGINT(node->schema->module->ctx);
return 0;
} else {
*prev = NULL;
*prev_pos = 0;
elem = next = top_sibling = root;
pos = 1;
goto dfs_search;
}
}
/* remember the last found node for next time */
*prev = node;
*prev_pos = pos;
return pos;
}
/**
* @brief Assign (fill) missing node positions.
*
* @param[in] set Set to fill positions in.
* @param[in] root Context root node.
* @param[in] root_type Context root type.
* @return LY_ERR
*/
static LY_ERR
set_assign_pos(struct lyxp_set *set, const struct lyd_node *root, enum lyxp_node_type root_type)
{
const struct lyd_node *prev = NULL, *tmp_node;
uint32_t i, tmp_pos = 0;
for (i = 0; i < set->used; ++i) {
if (!set->val.nodes[i].pos) {
tmp_node = NULL;
switch (set->val.nodes[i].type) {
case LYXP_NODE_ATTR:
tmp_node = set->val.attrs[i].attr->parent;
if (!tmp_node) {
LOGINT_RET(root->schema->module->ctx);
}
/* fallthrough */
case LYXP_NODE_ELEM:
case LYXP_NODE_TEXT:
if (!tmp_node) {
tmp_node = set->val.nodes[i].node;
}
set->val.nodes[i].pos = get_node_pos(tmp_node, set->val.nodes[i].type, root, root_type, &prev, &tmp_pos);
break;
default:
/* all roots have position 0 */
break;
}
}
}
return LY_SUCCESS;
}
/**
* @brief Get unique @p attr position in the parent attributes.
*
* @param[in] attr Attr to use.
* @return Attribute position.
*/
static uint16_t
get_attr_pos(struct lyd_attr *attr)
{
uint16_t pos = 0;
struct lyd_attr *attr2;
for (attr2 = attr->parent->attr; attr2 && (attr2 != attr); attr2 = attr2->next) {
++pos;
}
assert(attr2);
return pos;
}
/**
* @brief Compare 2 nodes in respect to XPath document order.
*
* @param[in] item1 1st node.
* @param[in] item2 2nd node.
* @return If 1st > 2nd returns 1, 1st == 2nd returns 0, and 1st < 2nd returns -1.
*/
static int
set_sort_compare(struct lyxp_set_node *item1, struct lyxp_set_node *item2)
{
uint32_t attr_pos1 = 0, attr_pos2 = 0;
if (item1->pos < item2->pos) {
return -1;
}
if (item1->pos > item2->pos) {
return 1;
}
/* node positions are equal, the fun case */
/* 1st ELEM - == - 2nd TEXT, 1st TEXT - == - 2nd ELEM */
/* special case since text nodes are actually saved as their parents */
if ((item1->node == item2->node) && (item1->type != item2->type)) {
if (item1->type == LYXP_NODE_ELEM) {
assert(item2->type == LYXP_NODE_TEXT);
return -1;
} else {
assert((item1->type == LYXP_NODE_TEXT) && (item2->type == LYXP_NODE_ELEM));
return 1;
}
}
/* we need attr positions now */
if (item1->type == LYXP_NODE_ATTR) {
attr_pos1 = get_attr_pos((struct lyd_attr *)item1->node);
}
if (item2->type == LYXP_NODE_ATTR) {
attr_pos2 = get_attr_pos((struct lyd_attr *)item2->node);
}
/* 1st ROOT - 2nd ROOT, 1st ELEM - 2nd ELEM, 1st TEXT - 2nd TEXT, 1st ATTR - =pos= - 2nd ATTR */
/* check for duplicates */
if (item1->node == item2->node) {
assert((item1->type == item2->type) && ((item1->type != LYXP_NODE_ATTR) || (attr_pos1 == attr_pos2)));
return 0;
}
/* 1st ELEM - 2nd TEXT, 1st ELEM - any pos - 2nd ATTR */
/* elem is always first, 2nd node is after it */
if (item1->type == LYXP_NODE_ELEM) {
assert(item2->type != LYXP_NODE_ELEM);
return -1;
}
/* 1st TEXT - 2nd ELEM, 1st TEXT - any pos - 2nd ATTR, 1st ATTR - any pos - 2nd ELEM, 1st ATTR - >pos> - 2nd ATTR */
/* 2nd is before 1st */
if (((item1->type == LYXP_NODE_TEXT)
&& ((item2->type == LYXP_NODE_ELEM) || (item2->type == LYXP_NODE_ATTR)))
|| ((item1->type == LYXP_NODE_ATTR) && (item2->type == LYXP_NODE_ELEM))
|| (((item1->type == LYXP_NODE_ATTR) && (item2->type == LYXP_NODE_ATTR))
&& (attr_pos1 > attr_pos2))) {
return 1;
}
/* 1st ATTR - any pos - 2nd TEXT, 1st ATTR <pos< - 2nd ATTR */
/* 2nd is after 1st */
return -1;
}
/**
* @brief Set cast for comparisons.
*
* @param[in] trg Target set to cast source into.
* @param[in] src Source set.
* @param[in] type Target set type.
* @param[in] src_idx Source set node index.
* @return LY_ERR
*/
static LY_ERR
set_comp_cast(struct lyxp_set *trg, struct lyxp_set *src, enum lyxp_set_type type, uint32_t src_idx)
{
assert(src->type == LYXP_SET_NODE_SET);
set_init(trg, src);
/* insert node into target set */
set_insert_node(trg, src->val.nodes[src_idx].node, src->val.nodes[src_idx].pos, src->val.nodes[src_idx].type, 0);
/* cast target set appropriately */
return lyxp_set_cast(trg, type);
}
#ifndef NDEBUG
/**
* @brief Bubble sort @p set into XPath document order.
* Context position aware. Unused in the 'Release' build target.
*
* @param[in] set Set to sort.
* @return How many times the whole set was traversed - 1 (if set was sorted, returns 0).
*/
static int
set_sort(struct lyxp_set *set)
{
uint32_t i, j;
int ret = 0, cmp, inverted, change;
const struct lyd_node *root;
struct lyxp_set_node item;
struct lyxp_set_hash_node hnode;
uint64_t hash;
if ((set->type != LYXP_SET_NODE_SET) || (set->used == 1)) {
return 0;
}
/* find first top-level node to be used as anchor for positions */
for (root = set->ctx_node; root->parent; root = (const struct lyd_node *)root->parent);
for (; root->prev->next; root = root->prev);
/* fill positions */
if (set_assign_pos(set, root, set->root_type)) {
return -1;
}
LOGDBG(LY_LDGXPATH, "SORT BEGIN");
print_set_debug(set);
for (i = 0; i < set->used; ++i) {
inverted = 0;
change = 0;
for (j = 1; j < set->used - i; ++j) {
/* compare node positions */
if (inverted) {
cmp = set_sort_compare(&set->val.nodes[j], &set->val.nodes[j - 1]);
} else {
cmp = set_sort_compare(&set->val.nodes[j - 1], &set->val.nodes[j]);
}
/* swap if needed */
if ((inverted && (cmp < 0)) || (!inverted && (cmp > 0))) {
change = 1;
item = set->val.nodes[j - 1];
set->val.nodes[j - 1] = set->val.nodes[j];
set->val.nodes[j] = item;
} else {
/* whether node_pos1 should be smaller than node_pos2 or the other way around */
inverted = !inverted;
}
}
++ret;
if (!change) {
break;
}
}
LOGDBG(LY_LDGXPATH, "SORT END %d", ret);
print_set_debug(set);
/* check node hashes */
if (set->used >= LYD_HT_MIN_ITEMS) {
assert(set->ht);
for (i = 0; i < set->used; ++i) {
hnode.node = set->val.nodes[i].node;
hnode.type = set->val.nodes[i].type;
hash = dict_hash_multi(0, (const char *)&hnode.node, sizeof hnode.node);
hash = dict_hash_multi(hash, (const char *)&hnode.type, sizeof hnode.type);
hash = dict_hash_multi(hash, NULL, 0);
assert(!lyht_find(set->ht, &hnode, hash, NULL));
}
}
return ret - 1;
}
/**
* @brief Remove duplicate entries in a sorted node set.
*
* @param[in] set Sorted set to check.
* @return LY_ERR (LY_EEXIST if some duplicates are found)
*/
static LY_ERR
set_sorted_dup_node_clean(struct lyxp_set *set)
{
uint32_t i = 0;
LY_ERR ret = LY_SUCCESS;
if (set->used > 1) {
while (i < set->used - 1) {
if ((set->val.nodes[i].node == set->val.nodes[i + 1].node)
&& (set->val.nodes[i].type == set->val.nodes[i + 1].type)) {
set_remove_node_none(set, i + 1);
ret = LY_EEXIST;
}
++i;
}
}
set_remove_nodes_none(set);
return ret;
}
#endif
/**
* @brief Merge 2 sorted sets into one.
*
* @param[in,out] trg Set to merge into. Duplicates are removed.
* @param[in] src Set to be merged into @p trg. It is cast to #LYXP_SET_EMPTY on success.
* @return LY_ERR
*/
static LY_ERR
set_sorted_merge(struct lyxp_set *trg, struct lyxp_set *src)
{
uint32_t i, j, k, count, dup_count;
int cmp;
const struct lyd_node *root;
if (((trg->type != LYXP_SET_NODE_SET) && (trg->type != LYXP_SET_EMPTY))
|| ((src->type != LYXP_SET_NODE_SET) && (src->type != LYXP_SET_EMPTY))) {
return LY_EINVAL;
}
if (src->type == LYXP_SET_EMPTY) {
return LY_SUCCESS;
} else if (trg->type == LYXP_SET_EMPTY) {
set_fill_set(trg, src);
lyxp_set_cast(src, LYXP_SET_EMPTY);
return LY_SUCCESS;
}
/* find first top-level node to be used as anchor for positions */
for (root = trg->ctx_node; root->parent; root = (const struct lyd_node *)root->parent);
for (; root->prev->next; root = root->prev);
/* fill positions */
if (set_assign_pos(trg, root, trg->root_type) || set_assign_pos(src, root, src->root_type)) {
return LY_EINT;
}
#ifndef NDEBUG
LOGDBG(LY_LDGXPATH, "MERGE target");
print_set_debug(trg);
LOGDBG(LY_LDGXPATH, "MERGE source");
print_set_debug(src);
#endif
/* make memory for the merge (duplicates are not detected yet, so space
* will likely be wasted on them, too bad) */
if (trg->size - trg->used < src->used) {
trg->size = trg->used + src->used;
trg->val.nodes = ly_realloc(trg->val.nodes, trg->size * sizeof *trg->val.nodes);
LY_CHECK_ERR_RET(!trg->val.nodes, LOGMEM(src->ctx), LY_EMEM);
}
i = 0;
j = 0;
count = 0;
dup_count = 0;
do {
cmp = set_sort_compare(&src->val.nodes[i], &trg->val.nodes[j]);
if (!cmp) {
if (!count) {
/* duplicate, just skip it */
++i;
++j;
} else {
/* we are copying something already, so let's copy the duplicate too,
* we are hoping that afterwards there are some more nodes to
* copy and this way we can copy them all together */
++count;
++dup_count;
++i;
++j;
}
} else if (cmp < 0) {
/* inserting src node into trg, just remember it for now */
++count;
++i;
/* insert the hash now */
set_insert_node_hash(trg, src->val.nodes[i - 1].node, src->val.nodes[i - 1].type);
} else if (count) {
copy_nodes:
/* time to actually copy the nodes, we have found the largest block of nodes */
memmove(&trg->val.nodes[j + (count - dup_count)],
&trg->val.nodes[j],
(trg->used - j) * sizeof *trg->val.nodes);
memcpy(&trg->val.nodes[j - dup_count], &src->val.nodes[i - count], count * sizeof *src->val.nodes);
trg->used += count - dup_count;
/* do not change i, except the copying above, we are basically doing exactly what is in the else branch below */
j += count - dup_count;
count = 0;
dup_count = 0;
} else {
++j;
}
} while ((i < src->used) && (j < trg->used));
if ((i < src->used) || count) {
/* insert all the hashes first */
for (k = i; k < src->used; ++k) {
set_insert_node_hash(trg, src->val.nodes[k].node, src->val.nodes[k].type);
}
/* loop ended, but we need to copy something at trg end */
count += src->used - i;
i = src->used;
goto copy_nodes;
}
/* we are inserting hashes before the actual node insert, which causes
* situations when there were initially not enough items for a hash table,
* but even after some were inserted, hash table was not created (during
* insertion the number of items is not updated yet) */
if (!trg->ht && (trg->used >= LYD_HT_MIN_ITEMS)) {
set_insert_node_hash(trg, NULL, 0);
}
#ifndef NDEBUG
LOGDBG(LY_LDGXPATH, "MERGE result");
print_set_debug(trg);
#endif
lyxp_set_cast(src, LYXP_SET_EMPTY);
return LY_SUCCESS;
}
/*
* (re)parse functions
*
* Parse functions parse the expression into
* tokens (syntactic analysis).
*
* Reparse functions perform semantic analysis
* (do not save the result, just a check) of
* the expression and fill repeat indices.
*/
/**
* @brief Look at the next token and check its kind.
*
* @param[in] ctx Context for logging.
* @param[in] exp Expression to use.
* @param[in] exp_idx Position in the expression \p exp.
* @param[in] want_tok Expected token.
* @param[in] strict Whether the token is strictly required (print error if
* not the next one) or we simply want to check whether it is the next or not.
* @return LY_ERR
*/
static LY_ERR
exp_check_token(struct ly_ctx *ctx, struct lyxp_expr *exp, uint16_t exp_idx, enum lyxp_token want_tok, int strict)
{
if (exp->used == exp_idx) {
if (strict) {
LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_EOF);
}
return LY_EINVAL;
}
if (want_tok && (exp->tokens[exp_idx] != want_tok)) {
if (strict) {
LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_INTOK,
print_token(exp->tokens[exp_idx]), &exp->expr[exp->tok_pos[exp_idx]]);
}
return LY_EINVAL;
}
return LY_SUCCESS;
}
/**
* @brief Stack operation push on the repeat array.
*
* @param[in] exp Expression to use.
* @param[in] exp_idx Position in the expresion \p exp.
* @param[in] repeat_op_idx Index from \p exp of the operator token. This value is pushed.
*/
static void
exp_repeat_push(struct lyxp_expr *exp, uint16_t exp_idx, uint16_t repeat_op_idx)
{
uint16_t i;
if (exp->repeat[exp_idx]) {
for (i = 0; exp->repeat[exp_idx][i]; ++i);
exp->repeat[exp_idx] = realloc(exp->repeat[exp_idx], (i + 2) * sizeof *exp->repeat[exp_idx]);
LY_CHECK_ERR_RET(!exp->repeat[exp_idx], LOGMEM(NULL), );
exp->repeat[exp_idx][i] = repeat_op_idx;
exp->repeat[exp_idx][i + 1] = 0;
} else {
exp->repeat[exp_idx] = calloc(2, sizeof *exp->repeat[exp_idx]);
LY_CHECK_ERR_RET(!exp->repeat[exp_idx], LOGMEM(NULL), );
exp->repeat[exp_idx][0] = repeat_op_idx;
}
}
/**
* @brief Reparse Predicate. Logs directly on error.
*
* [7] Predicate ::= '[' Expr ']'
*
* @param[in] ctx Context for logging.
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @return LY_ERR
*/
static LY_ERR
reparse_predicate(struct ly_ctx *ctx, struct lyxp_expr *exp, uint16_t *exp_idx)
{
LY_ERR rc;
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_BRACK1, 1);
LY_CHECK_RET(rc);
++(*exp_idx);
rc = reparse_or_expr(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_BRACK2, 1);
LY_CHECK_RET(rc);
++(*exp_idx);
return LY_SUCCESS;
}
/**
* @brief Reparse RelativeLocationPath. Logs directly on error.
*
* [4] RelativeLocationPath ::= Step | RelativeLocationPath '/' Step | RelativeLocationPath '//' Step
* [5] Step ::= '@'? NodeTest Predicate* | '.' | '..'
* [6] NodeTest ::= NameTest | NodeType '(' ')'
*
* @param[in] ctx Context for logging.
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression \p exp.
* @return LY_ERR (LY_EINCOMPLETE on forward reference)
*/
static LY_ERR
reparse_relative_location_path(struct ly_ctx *ctx, struct lyxp_expr *exp, uint16_t *exp_idx)
{
LY_ERR rc;
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_NONE, 1);
LY_CHECK_RET(rc);
goto step;
do {
/* '/' or '//' */
++(*exp_idx);
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_NONE, 1);
LY_CHECK_RET(rc);
step:
/* Step */
switch (exp->tokens[*exp_idx]) {
case LYXP_TOKEN_DOT:
++(*exp_idx);
break;
case LYXP_TOKEN_DDOT:
++(*exp_idx);
break;
case LYXP_TOKEN_AT:
++(*exp_idx);
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_NONE, 1);
LY_CHECK_RET(rc);
if ((exp->tokens[*exp_idx] != LYXP_TOKEN_NAMETEST) && (exp->tokens[*exp_idx] != LYXP_TOKEN_NODETYPE)) {
LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_INTOK,
print_token(exp->tokens[*exp_idx]), &exp->expr[exp->tok_pos[*exp_idx]]);
return LY_EVALID;
}
/* fall through */
case LYXP_TOKEN_NAMETEST:
++(*exp_idx);
goto reparse_predicate;
break;
case LYXP_TOKEN_NODETYPE:
++(*exp_idx);
/* '(' */
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_PAR1, 1);
LY_CHECK_RET(rc);
++(*exp_idx);
/* ')' */
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_PAR2, 1);
LY_CHECK_RET(rc);
++(*exp_idx);
reparse_predicate:
/* Predicate* */
while ((exp->used > *exp_idx) && (exp->tokens[*exp_idx] == LYXP_TOKEN_BRACK1)) {
rc = reparse_predicate(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
}
break;
default:
LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_INTOK,
print_token(exp->tokens[*exp_idx]), &exp->expr[exp->tok_pos[*exp_idx]]);
return LY_EVALID;
}
} while ((exp->used > *exp_idx) && (exp->tokens[*exp_idx] == LYXP_TOKEN_OPERATOR_PATH));
return LY_SUCCESS;
}
/**
* @brief Reparse AbsoluteLocationPath. Logs directly on error.
*
* [3] AbsoluteLocationPath ::= '/' RelativeLocationPath? | '//' RelativeLocationPath
*
* @param[in] ctx Context for logging.
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression \p exp.
* @return LY_ERR
*/
static LY_ERR
reparse_absolute_location_path(struct ly_ctx *ctx, struct lyxp_expr *exp, uint16_t *exp_idx)
{
LY_ERR rc;
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_OPERATOR_PATH, 1);
LY_CHECK_RET(rc);
/* '/' RelativeLocationPath? */
if (exp->tok_len[*exp_idx] == 1) {
/* '/' */
++(*exp_idx);
if (exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_NONE, 0)) {
return LY_SUCCESS;
}
switch (exp->tokens[*exp_idx]) {
case LYXP_TOKEN_DOT:
case LYXP_TOKEN_DDOT:
case LYXP_TOKEN_AT:
case LYXP_TOKEN_NAMETEST:
case LYXP_TOKEN_NODETYPE:
rc = reparse_relative_location_path(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
/* fall through */
default:
break;
}
/* '//' RelativeLocationPath */
} else {
/* '//' */
++(*exp_idx);
rc = reparse_relative_location_path(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
}
return LY_SUCCESS;
}
/**
* @brief Reparse FunctionCall. Logs directly on error.
*
* [9] FunctionCall ::= FunctionName '(' ( Expr ( ',' Expr )* )? ')'
*
* @param[in] ctx Context for logging.
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @return LY_ERR
*/
static LY_ERR
reparse_function_call(struct ly_ctx *ctx, struct lyxp_expr *exp, uint16_t *exp_idx)
{
int min_arg_count = -1, max_arg_count, arg_count;
uint16_t func_exp_idx;
LY_ERR rc;
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_FUNCNAME, 1);
LY_CHECK_RET(rc);
func_exp_idx = *exp_idx;
switch (exp->tok_len[*exp_idx]) {
case 3:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "not", 3)) {
min_arg_count = 1;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "sum", 3)) {
min_arg_count = 1;
max_arg_count = 1;
}
break;
case 4:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "lang", 4)) {
min_arg_count = 1;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "last", 4)) {
min_arg_count = 0;
max_arg_count = 0;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "name", 4)) {
min_arg_count = 0;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "true", 4)) {
min_arg_count = 0;
max_arg_count = 0;
}
break;
case 5:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "count", 5)) {
min_arg_count = 1;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "false", 5)) {
min_arg_count = 0;
max_arg_count = 0;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "floor", 5)) {
min_arg_count = 1;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "round", 5)) {
min_arg_count = 1;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "deref", 5)) {
min_arg_count = 1;
max_arg_count = 1;
}
break;
case 6:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "concat", 6)) {
min_arg_count = 2;
max_arg_count = INT_MAX;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "number", 6)) {
min_arg_count = 0;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "string", 6)) {
min_arg_count = 0;
max_arg_count = 1;
}
break;
case 7:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "boolean", 7)) {
min_arg_count = 1;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "ceiling", 7)) {
min_arg_count = 1;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "current", 7)) {
min_arg_count = 0;
max_arg_count = 0;
}
break;
case 8:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "contains", 8)) {
min_arg_count = 2;
max_arg_count = 2;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "position", 8)) {
min_arg_count = 0;
max_arg_count = 0;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "re-match", 8)) {
min_arg_count = 2;
max_arg_count = 2;
}
break;
case 9:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "substring", 9)) {
min_arg_count = 2;
max_arg_count = 3;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "translate", 9)) {
min_arg_count = 3;
max_arg_count = 3;
}
break;
case 10:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "local-name", 10)) {
min_arg_count = 0;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "enum-value", 10)) {
min_arg_count = 1;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "bit-is-set", 10)) {
min_arg_count = 2;
max_arg_count = 2;
}
break;
case 11:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "starts-with", 11)) {
min_arg_count = 2;
max_arg_count = 2;
}
break;
case 12:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "derived-from", 12)) {
min_arg_count = 2;
max_arg_count = 2;
}
break;
case 13:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "namespace-uri", 13)) {
min_arg_count = 0;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "string-length", 13)) {
min_arg_count = 0;
max_arg_count = 1;
}
break;
case 15:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "normalize-space", 15)) {
min_arg_count = 0;
max_arg_count = 1;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "substring-after", 15)) {
min_arg_count = 2;
max_arg_count = 2;
}
break;
case 16:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "substring-before", 16)) {
min_arg_count = 2;
max_arg_count = 2;
}
break;
case 20:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "derived-from-or-self", 20)) {
min_arg_count = 2;
max_arg_count = 2;
}
break;
}
if (min_arg_count == -1) {
LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_INFUNC, exp->tok_len[*exp_idx], &exp->expr[exp->tok_pos[*exp_idx]]);
return LY_EINVAL;
}
++(*exp_idx);
/* '(' */
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_PAR1, 1);
LY_CHECK_RET(rc);
++(*exp_idx);
/* ( Expr ( ',' Expr )* )? */
arg_count = 0;
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_NONE, 1);
LY_CHECK_RET(rc);
if (exp->tokens[*exp_idx] != LYXP_TOKEN_PAR2) {
++arg_count;
rc = reparse_or_expr(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
}
while ((exp->used > *exp_idx) && (exp->tokens[*exp_idx] == LYXP_TOKEN_COMMA)) {
++(*exp_idx);
++arg_count;
rc = reparse_or_expr(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
}
/* ')' */
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_PAR2, 1);
LY_CHECK_RET(rc);
++(*exp_idx);
if ((arg_count < min_arg_count) || (arg_count > max_arg_count)) {
LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_INARGCOUNT, arg_count, exp->tok_len[func_exp_idx],
&exp->expr[exp->tok_pos[func_exp_idx]]);
return LY_EVALID;
}
return LY_SUCCESS;
}
/**
* @brief Reparse PathExpr. Logs directly on error.
*
* [10] PathExpr ::= LocationPath | PrimaryExpr Predicate*
* | PrimaryExpr Predicate* '/' RelativeLocationPath
* | PrimaryExpr Predicate* '//' RelativeLocationPath
* [2] LocationPath ::= RelativeLocationPath | AbsoluteLocationPath
* [8] PrimaryExpr ::= '(' Expr ')' | Literal | Number | FunctionCall
*
* @param[in] ctx Context for logging.
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @return LY_ERR
*/
static LY_ERR
reparse_path_expr(struct ly_ctx *ctx, struct lyxp_expr *exp, uint16_t *exp_idx)
{
LY_ERR rc;
if (exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_NONE, 1)) {
return -1;
}
switch (exp->tokens[*exp_idx]) {
case LYXP_TOKEN_PAR1:
/* '(' Expr ')' Predicate* */
++(*exp_idx);
rc = reparse_or_expr(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
rc = exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_PAR2, 1);
LY_CHECK_RET(rc);
++(*exp_idx);
goto predicate;
break;
case LYXP_TOKEN_DOT:
case LYXP_TOKEN_DDOT:
case LYXP_TOKEN_AT:
case LYXP_TOKEN_NAMETEST:
case LYXP_TOKEN_NODETYPE:
/* RelativeLocationPath */
rc = reparse_relative_location_path(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
break;
case LYXP_TOKEN_FUNCNAME:
/* FunctionCall */
rc = reparse_function_call(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
goto predicate;
break;
case LYXP_TOKEN_OPERATOR_PATH:
/* AbsoluteLocationPath */
rc = reparse_absolute_location_path(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
break;
case LYXP_TOKEN_LITERAL:
/* Literal */
++(*exp_idx);
goto predicate;
break;
case LYXP_TOKEN_NUMBER:
/* Number */
++(*exp_idx);
goto predicate;
break;
default:
LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_INTOK,
print_token(exp->tokens[*exp_idx]), &exp->expr[exp->tok_pos[*exp_idx]]);
return LY_EVALID;
}
return LY_SUCCESS;
predicate:
/* Predicate* */
while ((exp->used > *exp_idx) && (exp->tokens[*exp_idx] == LYXP_TOKEN_BRACK1)) {
rc = reparse_predicate(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
}
/* ('/' or '//') RelativeLocationPath */
if ((exp->used > *exp_idx) && (exp->tokens[*exp_idx] == LYXP_TOKEN_OPERATOR_PATH)) {
/* '/' or '//' */
++(*exp_idx);
rc = reparse_relative_location_path(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
}
return LY_SUCCESS;
}
/**
* @brief Reparse UnaryExpr. Logs directly on error.
*
* [17] UnaryExpr ::= UnionExpr | '-' UnaryExpr
* [18] UnionExpr ::= PathExpr | UnionExpr '|' PathExpr
*
* @param[in] ctx Context for logging.
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @return LY_ERR
*/
static LY_ERR
reparse_unary_expr(struct ly_ctx *ctx, struct lyxp_expr *exp, uint16_t *exp_idx)
{
uint16_t prev_exp;
LY_ERR rc;
/* ('-')* */
prev_exp = *exp_idx;
while (!exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_OPERATOR_MATH, 0)
&& (exp->expr[exp->tok_pos[*exp_idx]] == '-')) {
exp_repeat_push(exp, prev_exp, LYXP_EXPR_UNARY);
++(*exp_idx);
}
/* PathExpr */
prev_exp = *exp_idx;
rc = reparse_path_expr(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
/* ('|' PathExpr)* */
while (!exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_OPERATOR_UNI, 0)) {
exp_repeat_push(exp, prev_exp, LYXP_EXPR_UNION);
++(*exp_idx);
rc = reparse_path_expr(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
}
return LY_SUCCESS;
}
/**
* @brief Reparse AdditiveExpr. Logs directly on error.
*
* [15] AdditiveExpr ::= MultiplicativeExpr
* | AdditiveExpr '+' MultiplicativeExpr
* | AdditiveExpr '-' MultiplicativeExpr
* [16] MultiplicativeExpr ::= UnaryExpr
* | MultiplicativeExpr '*' UnaryExpr
* | MultiplicativeExpr 'div' UnaryExpr
* | MultiplicativeExpr 'mod' UnaryExpr
*
* @param[in] ctx Context for logging.
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @return LY_ERR
*/
static LY_ERR
reparse_additive_expr(struct ly_ctx *ctx, struct lyxp_expr *exp, uint16_t *exp_idx)
{
uint16_t prev_add_exp, prev_mul_exp;
LY_ERR rc;
prev_add_exp = *exp_idx;
goto reparse_multiplicative_expr;
/* ('+' / '-' MultiplicativeExpr)* */
while (!exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_OPERATOR_MATH, 0)
&& ((exp->expr[exp->tok_pos[*exp_idx]] == '+') || (exp->expr[exp->tok_pos[*exp_idx]] == '-'))) {
exp_repeat_push(exp, prev_add_exp, LYXP_EXPR_ADDITIVE);
++(*exp_idx);
reparse_multiplicative_expr:
/* UnaryExpr */
prev_mul_exp = *exp_idx;
rc = reparse_unary_expr(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
/* ('*' / 'div' / 'mod' UnaryExpr)* */
while (!exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_OPERATOR_MATH, 0)
&& ((exp->expr[exp->tok_pos[*exp_idx]] == '*') || (exp->tok_len[*exp_idx] == 3))) {
exp_repeat_push(exp, prev_mul_exp, LYXP_EXPR_MULTIPLICATIVE);
++(*exp_idx);
rc = reparse_unary_expr(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
}
}
return LY_SUCCESS;
}
/**
* @brief Reparse EqualityExpr. Logs directly on error.
*
* [13] EqualityExpr ::= RelationalExpr | EqualityExpr '=' RelationalExpr
* | EqualityExpr '!=' RelationalExpr
* [14] RelationalExpr ::= AdditiveExpr
* | RelationalExpr '<' AdditiveExpr
* | RelationalExpr '>' AdditiveExpr
* | RelationalExpr '<=' AdditiveExpr
* | RelationalExpr '>=' AdditiveExpr
*
* @param[in] ctx Context for logging.
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @return LY_ERR
*/
static LY_ERR
reparse_equality_expr(struct ly_ctx *ctx, struct lyxp_expr *exp, uint16_t *exp_idx)
{
uint16_t prev_eq_exp, prev_rel_exp;
LY_ERR rc;
prev_eq_exp = *exp_idx;
goto reparse_additive_expr;
/* ('=' / '!=' RelationalExpr)* */
while (!exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_OPERATOR_COMP, 0)
&& ((exp->expr[exp->tok_pos[*exp_idx]] == '=') || (exp->expr[exp->tok_pos[*exp_idx]] == '!'))) {
exp_repeat_push(exp, prev_eq_exp, LYXP_EXPR_EQUALITY);
++(*exp_idx);
reparse_additive_expr:
/* AdditiveExpr */
prev_rel_exp = *exp_idx;
rc = reparse_additive_expr(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
/* ('<' / '>' / '<=' / '>=' AdditiveExpr)* */
while (!exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_OPERATOR_COMP, 0)
&& ((exp->expr[exp->tok_pos[*exp_idx]] == '<') || (exp->expr[exp->tok_pos[*exp_idx]] == '>'))) {
exp_repeat_push(exp, prev_rel_exp, LYXP_EXPR_RELATIONAL);
++(*exp_idx);
rc = reparse_additive_expr(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
}
}
return LY_SUCCESS;
}
/**
* @brief Reparse OrExpr. Logs directly on error.
*
* [11] OrExpr ::= AndExpr | OrExpr 'or' AndExpr
* [12] AndExpr ::= EqualityExpr | AndExpr 'and' EqualityExpr
*
* @param[in] ctx Context for logging.
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @return LY_ERR
*/
static LY_ERR
reparse_or_expr(struct ly_ctx *ctx, struct lyxp_expr *exp, uint16_t *exp_idx)
{
uint16_t prev_or_exp, prev_and_exp;
LY_ERR rc;
prev_or_exp = *exp_idx;
goto reparse_equality_expr;
/* ('or' AndExpr)* */
while (!exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_OPERATOR_LOG, 0) && (exp->tok_len[*exp_idx] == 2)) {
exp_repeat_push(exp, prev_or_exp, LYXP_EXPR_OR);
++(*exp_idx);
reparse_equality_expr:
/* EqualityExpr */
prev_and_exp = *exp_idx;
rc = reparse_equality_expr(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
/* ('and' EqualityExpr)* */
while (!exp_check_token(ctx, exp, *exp_idx, LYXP_TOKEN_OPERATOR_LOG, 0) && (exp->tok_len[*exp_idx] == 3)) {
exp_repeat_push(exp, prev_and_exp, LYXP_EXPR_AND);
++(*exp_idx);
rc = reparse_equality_expr(ctx, exp, exp_idx);
LY_CHECK_RET(rc);
}
}
return LY_SUCCESS;
}
/**
* @brief Parse NCName.
*
* @param[in] ncname Name to parse.
* @return Length of @p ncname valid bytes.
*/
static long int
parse_ncname(const char *ncname)
{
unsigned int uc;
size_t size;
long int len = 0;
LY_CHECK_RET(ly_getutf8(&ncname, &uc, &size), 0);
if (!is_xmlqnamestartchar(uc) || (uc == ':')) {
return len;
}
do {
len += size;
if (!*ncname) {
break;
}
LY_CHECK_RET(ly_getutf8(&ncname, &uc, &size), -len);
} while (is_xmlqnamechar(uc) && (uc != ':'));
return len;
}
/**
* @brief Add @p token into the expression @p exp.
*
* @param[in] ctx Context for logging.
* @param[in] exp Expression to use.
* @param[in] token Token to add.
* @param[in] tok_pos Token position in the XPath expression.
* @param[in] tok_len Token length in the XPath expression.
* @return LY_ERR
*/
static LY_ERR
exp_add_token(struct ly_ctx *ctx, struct lyxp_expr *exp, enum lyxp_token token, uint16_t tok_pos, uint16_t tok_len)
{
uint32_t prev;
if (exp->used == exp->size) {
prev = exp->size;
exp->size += LYXP_EXPR_SIZE_STEP;
if (prev > exp->size) {
LOGINT(ctx);
return LY_EINT;
}
exp->tokens = ly_realloc(exp->tokens, exp->size * sizeof *exp->tokens);
LY_CHECK_ERR_RET(!exp->tokens, LOGMEM(ctx), LY_EMEM);
exp->tok_pos = ly_realloc(exp->tok_pos, exp->size * sizeof *exp->tok_pos);
LY_CHECK_ERR_RET(!exp->tok_pos, LOGMEM(ctx), LY_EMEM);
exp->tok_len = ly_realloc(exp->tok_len, exp->size * sizeof *exp->tok_len);
LY_CHECK_ERR_RET(!exp->tok_len, LOGMEM(ctx), LY_EMEM);
}
exp->tokens[exp->used] = token;
exp->tok_pos[exp->used] = tok_pos;
exp->tok_len[exp->used] = tok_len;
++exp->used;
return LY_SUCCESS;
}
void
lyxp_expr_free(struct ly_ctx *ctx, struct lyxp_expr *expr)
{
uint16_t i;
if (!expr) {
return;
}
lydict_remove(ctx, expr->expr);
free(expr->tokens);
free(expr->tok_pos);
free(expr->tok_len);
if (expr->repeat) {
for (i = 0; i < expr->used; ++i) {
free(expr->repeat[i]);
}
}
free(expr->repeat);
free(expr);
}
struct lyxp_expr *
lyxp_expr_parse(struct ly_ctx *ctx, const char *expr)
{
struct lyxp_expr *ret;
size_t parsed = 0, tok_len;
long int ncname_len;
enum lyxp_token tok_type;
int prev_function_check = 0;
uint16_t exp_idx = 0;
if (strlen(expr) > UINT16_MAX) {
LOGERR(ctx, LY_EINVAL, "XPath expression cannot be longer than %ud characters.", UINT16_MAX);
return NULL;
}
/* init lyxp_expr structure */
ret = calloc(1, sizeof *ret);
LY_CHECK_ERR_GOTO(!ret, LOGMEM(ctx), error);
ret->expr = lydict_insert(ctx, expr, strlen(expr));
LY_CHECK_ERR_GOTO(!ret->expr, LOGMEM(ctx), error);
ret->used = 0;
ret->size = LYXP_EXPR_SIZE_START;
ret->tokens = malloc(ret->size * sizeof *ret->tokens);
LY_CHECK_ERR_GOTO(!ret->tokens, LOGMEM(ctx), error);
ret->tok_pos = malloc(ret->size * sizeof *ret->tok_pos);
LY_CHECK_ERR_GOTO(!ret->tok_pos, LOGMEM(ctx), error);
ret->tok_len = malloc(ret->size * sizeof *ret->tok_len);
LY_CHECK_ERR_GOTO(!ret->tok_len, LOGMEM(ctx), error);
while (is_xmlws(expr[parsed])) {
++parsed;
}
do {
if (expr[parsed] == '(') {
/* '(' */
tok_len = 1;
tok_type = LYXP_TOKEN_PAR1;
if (prev_function_check && ret->used && (ret->tokens[ret->used - 1] == LYXP_TOKEN_NAMETEST)) {
/* it is a NodeType/FunctionName after all */
if (((ret->tok_len[ret->used - 1] == 4)
&& (!strncmp(&expr[ret->tok_pos[ret->used - 1]], "node", 4)
|| !strncmp(&expr[ret->tok_pos[ret->used - 1]], "text", 4))) ||
((ret->tok_len[ret->used - 1] == 7)
&& !strncmp(&expr[ret->tok_pos[ret->used - 1]], "comment", 7))) {
ret->tokens[ret->used - 1] = LYXP_TOKEN_NODETYPE;
} else {
ret->tokens[ret->used - 1] = LYXP_TOKEN_FUNCNAME;
}
prev_function_check = 0;
}
} else if (expr[parsed] == ')') {
/* ')' */
tok_len = 1;
tok_type = LYXP_TOKEN_PAR2;
} else if (expr[parsed] == '[') {
/* '[' */
tok_len = 1;
tok_type = LYXP_TOKEN_BRACK1;
} else if (expr[parsed] == ']') {
/* ']' */
tok_len = 1;
tok_type = LYXP_TOKEN_BRACK2;
} else if (!strncmp(&expr[parsed], "..", 2)) {
/* '..' */
tok_len = 2;
tok_type = LYXP_TOKEN_DDOT;
} else if ((expr[parsed] == '.') && (!isdigit(expr[parsed + 1]))) {
/* '.' */
tok_len = 1;
tok_type = LYXP_TOKEN_DOT;
} else if (expr[parsed] == '@') {
/* '@' */
tok_len = 1;
tok_type = LYXP_TOKEN_AT;
} else if (expr[parsed] == ',') {
/* ',' */
tok_len = 1;
tok_type = LYXP_TOKEN_COMMA;
} else if (expr[parsed] == '\'') {
/* Literal with ' */
for (tok_len = 1; (expr[parsed + tok_len] != '\0') && (expr[parsed + tok_len] != '\''); ++tok_len);
LY_CHECK_ERR_GOTO(expr[parsed + tok_len] == '\0',
LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_EOE, expr[parsed], &expr[parsed]), error);
++tok_len;
tok_type = LYXP_TOKEN_LITERAL;
} else if (expr[parsed] == '\"') {
/* Literal with " */
for (tok_len = 1; (expr[parsed + tok_len] != '\0') && (expr[parsed + tok_len] != '\"'); ++tok_len);
LY_CHECK_ERR_GOTO(expr[parsed + tok_len] == '\0',
LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_EOE, expr[parsed], &expr[parsed]), error);
++tok_len;
tok_type = LYXP_TOKEN_LITERAL;
} else if ((expr[parsed] == '.') || (isdigit(expr[parsed]))) {
/* Number */
for (tok_len = 0; isdigit(expr[parsed + tok_len]); ++tok_len);
if (expr[parsed + tok_len] == '.') {
++tok_len;
for (; isdigit(expr[parsed + tok_len]); ++tok_len);
}
tok_type = LYXP_TOKEN_NUMBER;
} else if (expr[parsed] == '/') {
/* Operator '/', '//' */
if (!strncmp(&expr[parsed], "//", 2)) {
tok_len = 2;
} else {
tok_len = 1;
}
tok_type = LYXP_TOKEN_OPERATOR_PATH;
} else if (!strncmp(&expr[parsed], "!=", 2) || !strncmp(&expr[parsed], "<=", 2)
|| !strncmp(&expr[parsed], ">=", 2)) {
/* Operator '!=', '<=', '>=' */
tok_len = 2;
tok_type = LYXP_TOKEN_OPERATOR_COMP;
} else if (expr[parsed] == '|') {
/* Operator '|' */
tok_len = 1;
tok_type = LYXP_TOKEN_OPERATOR_UNI;
} else if ((expr[parsed] == '+') || (expr[parsed] == '-')) {
/* Operator '+', '-' */
tok_len = 1;
tok_type = LYXP_TOKEN_OPERATOR_MATH;
} else if ((expr[parsed] == '=') || (expr[parsed] == '<') || (expr[parsed] == '>')) {
/* Operator '=', '<', '>' */
tok_len = 1;
tok_type = LYXP_TOKEN_OPERATOR_COMP;
} else if (ret->used && (ret->tokens[ret->used - 1] != LYXP_TOKEN_AT)
&& (ret->tokens[ret->used - 1] != LYXP_TOKEN_PAR1)
&& (ret->tokens[ret->used - 1] != LYXP_TOKEN_BRACK1)
&& (ret->tokens[ret->used - 1] != LYXP_TOKEN_COMMA)
&& (ret->tokens[ret->used - 1] != LYXP_TOKEN_OPERATOR_LOG)
&& (ret->tokens[ret->used - 1] != LYXP_TOKEN_OPERATOR_COMP)
&& (ret->tokens[ret->used - 1] != LYXP_TOKEN_OPERATOR_MATH)
&& (ret->tokens[ret->used - 1] != LYXP_TOKEN_OPERATOR_UNI)
&& (ret->tokens[ret->used - 1] != LYXP_TOKEN_OPERATOR_PATH)) {
/* Operator '*', 'or', 'and', 'mod', or 'div' */
if (expr[parsed] == '*') {
tok_len = 1;
tok_type = LYXP_TOKEN_OPERATOR_MATH;
} else if (!strncmp(&expr[parsed], "or", 2)) {
tok_len = 2;
tok_type = LYXP_TOKEN_OPERATOR_LOG;
} else if (!strncmp(&expr[parsed], "and", 3)) {
tok_len = 3;
tok_type = LYXP_TOKEN_OPERATOR_LOG;
} else if (!strncmp(&expr[parsed], "mod", 3) || !strncmp(&expr[parsed], "div", 3)) {
tok_len = 3;
tok_type = LYXP_TOKEN_OPERATOR_MATH;
} else if (prev_function_check) {
LOGVAL(ctx, LY_VLOG_NONE, NULL, LYVE_XPATH, "Invalid character 0x%x ('%c'), perhaps \"%.*s\" is supposed to be a function call.",
expr[parsed], expr[parsed], ret->tok_len[ret->used - 1], &ret->expr[ret->tok_pos[ret->used - 1]]);
goto error;
} else {
LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_INEXPR, parsed + 1, expr);
goto error;
}
} else if (expr[parsed] == '*') {
/* NameTest '*' */
tok_len = 1;
tok_type = LYXP_TOKEN_NAMETEST;
} else {
/* NameTest (NCName ':' '*' | QName) or NodeType/FunctionName */
ncname_len = parse_ncname(&expr[parsed]);
LY_CHECK_ERR_GOTO(ncname_len < 0, LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_INEXPR, parsed - ncname_len + 1, expr), error);
tok_len = ncname_len;
if (expr[parsed + tok_len] == ':') {
++tok_len;
if (expr[parsed + tok_len] == '*') {
++tok_len;
} else {
ncname_len = parse_ncname(&expr[parsed + tok_len]);
LY_CHECK_ERR_GOTO(ncname_len < 0, LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_INEXPR, parsed - ncname_len + 1, expr), error);
tok_len += ncname_len;
}
/* remove old flag to prevent ambiguities */
prev_function_check = 0;
tok_type = LYXP_TOKEN_NAMETEST;
} else {
/* there is no prefix so it can still be NodeType/FunctionName, we can't finally decide now */
prev_function_check = 1;
tok_type = LYXP_TOKEN_NAMETEST;
}
}
/* store the token, move on to the next one */
LY_CHECK_GOTO(exp_add_token(ctx, ret, tok_type, parsed, tok_len), error);
parsed += tok_len;
while (is_xmlws(expr[parsed])) {
++parsed;
}
} while (expr[parsed]);
/* prealloc repeat */
ret->repeat = calloc(ret->size, sizeof *ret->repeat);
LY_CHECK_ERR_GOTO(!ret->repeat, LOGMEM(ctx), error);
/* fill repeat */
LY_CHECK_GOTO(reparse_or_expr(ctx, ret, &exp_idx), error);
if (ret->used > exp_idx) {
LOGVAL(ctx, LY_VLOG_NONE, NULL, LY_VCODE_XP_INTOK, "Unknown", &ret->expr[ret->tok_pos[exp_idx]]);
LOGVAL(ctx, LY_VLOG_NONE, NULL, LYVE_XPATH, "Unparsed characters \"%s\" left at the end of an XPath expression.",
&ret->expr[ret->tok_pos[exp_idx]]);
goto error;
}
print_expr_struct_debug(ret);
return ret;
error:
lyxp_expr_free(ctx, ret);
return NULL;
}
/*
* warn functions
*
* Warn functions check specific reasonable conditions for schema XPath
* and print a warning if they are not satisfied.
*/
/**
* @brief Get the last-added schema node that is currently in the context.
*
* @param[in] set Set to search in.
* @return Last-added schema context node, NULL if no node is in context.
*/
static struct lysc_node *
warn_get_scnode_in_ctx(struct lyxp_set *set)
{
uint32_t i;
if (!set || (set->type != LYXP_SET_SCNODE_SET)) {
return NULL;
}
i = set->used;
do {
--i;
if (set->val.scnodes[i].in_ctx == 1) {
/* if there are more, simply return the first found (last added) */
return set->val.scnodes[i].scnode;
}
} while (i);
return NULL;
}
/**
* @brief Test whether a type is numeric - integer type or decimal64.
*
* @param[in] type Type to test.
* @return 1 if numeric, 0 otherwise.
*/
static int
warn_is_numeric_type(struct lysc_type *type)
{
struct lysc_type_union *uni;
int ret;
uint32_t i;
switch (type->basetype) {
case LY_TYPE_DEC64:
case LY_TYPE_INT8:
case LY_TYPE_UINT8:
case LY_TYPE_INT16:
case LY_TYPE_UINT16:
case LY_TYPE_INT32:
case LY_TYPE_UINT32:
case LY_TYPE_INT64:
case LY_TYPE_UINT64:
return 1;
case LY_TYPE_UNION:
uni = (struct lysc_type_union *)type;
LY_ARRAY_FOR(uni->types, i) {
ret = warn_is_numeric_type(uni->types[i]);
if (ret) {
/* found a suitable type */
return 1;
}
}
/* did not find any suitable type */
return 0;
case LY_TYPE_LEAFREF:
return warn_is_numeric_type(((struct lysc_type_leafref *)type)->realtype);
default:
return 0;
}
}
/**
* @brief Test whether a type is string-like - no integers, decimal64 or binary.
*
* @param[in] type Type to test.
* @return 1 if string, 0 otherwise.
*/
static int
warn_is_string_type(struct lysc_type *type)
{
struct lysc_type_union *uni;
int ret;
uint32_t i;
switch (type->basetype) {
case LY_TYPE_BITS:
case LY_TYPE_ENUM:
case LY_TYPE_IDENT:
case LY_TYPE_INST:
case LY_TYPE_STRING:
return 1;
case LY_TYPE_UNION:
uni = (struct lysc_type_union *)type;
LY_ARRAY_FOR(uni->types, i) {
ret = warn_is_string_type(uni->types[i]);
if (ret) {
/* found a suitable type */
return 1;
}
}
/* did not find any suitable type */
return 0;
case LY_TYPE_LEAFREF:
return warn_is_string_type(((struct lysc_type_leafref *)type)->realtype);
default:
return 0;
}
}
/**
* @brief Test whether a type is one specific type.
*
* @param[in] type Type to test.
* @param[in] base Expected type.
* @return 1 if it is, 0 otherwise.
*/
static int
warn_is_specific_type(struct lysc_type *type, LY_DATA_TYPE base)
{
struct lysc_type_union *uni;
int ret;
uint32_t i;
if (type->basetype == base) {
return 1;
} else if (type->basetype == LY_TYPE_UNION) {
uni = (struct lysc_type_union *)type;
LY_ARRAY_FOR(uni->types, i) {
ret = warn_is_specific_type(uni->types[i], base);
if (ret) {
/* found a suitable type */
return 1;
}
}
/* did not find any suitable type */
return 0;
} else if (type->basetype == LY_TYPE_LEAFREF) {
return warn_is_specific_type(((struct lysc_type_leafref *)type)->realtype, base);
}
return 0;
}
/**
* @brief Get next type of a (union) type.
*
* @param[in] type Base type.
* @param[in] prev_type Previously returned type.
* @return Next type or NULL.
*/
static struct lysc_type *
warn_is_equal_type_next_type(struct lysc_type *type, struct lysc_type *prev_type)
{
struct lysc_type_union *uni;
int found = 0;
uint32_t i;
switch (type->basetype) {
case LY_TYPE_UNION:
uni = (struct lysc_type_union *)type;
if (!prev_type) {
return uni->types[0];
}
LY_ARRAY_FOR(uni->types, i) {
if (found) {
return uni->types[i];
}
if (prev_type == uni->types[i]) {
found = 1;
}
}
return NULL;
default:
if (prev_type) {
assert(type == prev_type);
return NULL;
} else {
return type;
}
}
}
/**
* @brief Test whether 2 types have a common type.
*
* @param[in] type1 First type.
* @param[in] type2 Second type.
* @return 1 if they do, 0 otherwise.
*/
static int
warn_is_equal_type(struct lysc_type *type1, struct lysc_type *type2)
{
struct lysc_type *t1, *rt1, *t2, *rt2;
t1 = NULL;
while ((t1 = warn_is_equal_type_next_type(type1, t1))) {
if (t1->basetype == LY_TYPE_LEAFREF) {
rt1 = ((struct lysc_type_leafref *)t1)->realtype;
} else {
rt1 = t1;
}
t2 = NULL;
while ((t2 = warn_is_equal_type_next_type(type2, t2))) {
if (t2->basetype == LY_TYPE_LEAFREF) {
rt2 = ((struct lysc_type_leafref *)t2)->realtype;
} else {
rt2 = t2;
}
if (rt2->basetype == rt1->basetype) {
/* match found */
return 1;
}
}
}
return 0;
}
/**
* @brief Check both operands of comparison operators.
*
* @param[in] ctx Context for errors.
* @param[in] set1 First operand set.
* @param[in] set2 Second operand set.
* @param[in] numbers_only Whether accept only numbers or other types are fine too (for '=' and '!=').
* @param[in] expr Start of the expression to print with the warning.
* @param[in] tok_pos Token position.
*/
static void
warn_operands(struct ly_ctx *ctx, struct lyxp_set *set1, struct lyxp_set *set2, int numbers_only, const char *expr, uint16_t tok_pos)
{
struct lysc_node_leaf *node1, *node2;
int leaves = 1, warning = 0;
node1 = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(set1);
node2 = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(set2);
if (!node1 && !node2) {
/* no node-sets involved, nothing to do */
return;
}
if (node1) {
if (!(node1->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(ctx, "Node type %s \"%s\" used as operand.", lys_nodetype2str(node1->nodetype), node1->name);
warning = 1;
leaves = 0;
} else if (numbers_only && !warn_is_numeric_type(node1->type)) {
LOGWRN(ctx, "Node \"%s\" is not of a numeric type, but used where it was expected.", node1->name);
warning = 1;
}
}
if (node2) {
if (!(node2->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(ctx, "Node type %s \"%s\" used as operand.", lys_nodetype2str(node2->nodetype), node2->name);
warning = 1;
leaves = 0;
} else if (numbers_only && !warn_is_numeric_type(node2->type)) {
LOGWRN(ctx, "Node \"%s\" is not of a numeric type, but used where it was expected.", node2->name);
warning = 1;
}
}
if (node1 && node2 && leaves && !numbers_only) {
if ((warn_is_numeric_type(node1->type) && !warn_is_numeric_type(node2->type))
|| (!warn_is_numeric_type(node1->type) && warn_is_numeric_type(node2->type))
|| (!warn_is_numeric_type(node1->type) && !warn_is_numeric_type(node2->type)
&& !warn_is_equal_type(node1->type, node2->type))) {
LOGWRN(ctx, "Incompatible types of operands \"%s\" and \"%s\" for comparison.", node1->name, node2->name);
warning = 1;
}
}
if (warning) {
LOGWRN(ctx, "Previous warning generated by XPath subexpression[%u] \"%.20s\".", tok_pos, expr + tok_pos);
}
}
/**
* @brief Check that a value is valid for a leaf. If not applicable, does nothing.
*
* @param[in] exp Parsed XPath expression.
* @param[in] set Set with the leaf/leaf-list.
* @param[in] val_exp Index of the value (literal/number) in @p exp.
* @param[in] equal_exp Index of the start of the equality expression in @p exp.
* @param[in] last_equal_exp Index of the end of the equality expression in @p exp.
*/
static void
warn_equality_value(struct lyxp_expr *exp, struct lyxp_set *set, uint16_t val_exp, uint16_t equal_exp, uint16_t last_equal_exp)
{
struct lysc_node *scnode;
struct lysc_type *type;
char *value;
LY_ERR rc;
struct ly_err_item *err = NULL;
if ((scnode = warn_get_scnode_in_ctx(set)) && (scnode->nodetype & (LYS_LEAF | LYS_LEAFLIST))
&& ((exp->tokens[val_exp] == LYXP_TOKEN_LITERAL) || (exp->tokens[val_exp] == LYXP_TOKEN_NUMBER))) {
/* check that the node can have the specified value */
if (exp->tokens[val_exp] == LYXP_TOKEN_LITERAL) {
value = strndup(exp->expr + exp->tok_pos[val_exp] + 1, exp->tok_len[val_exp] - 2);
} else {
value = strndup(exp->expr + exp->tok_pos[val_exp], exp->tok_len[val_exp]);
}
if (!value) {
LOGMEM(set->ctx);
return;
}
if ((((struct lysc_node_leaf *)scnode)->type->basetype == LY_TYPE_IDENT) && !strchr(value, ':')) {
LOGWRN(set->ctx, "Identityref \"%s\" comparison with identity \"%s\" without prefix, consider adding"
" a prefix or best using \"derived-from(-or-self)()\" functions.", scnode->name, value);
LOGWRN(set->ctx, "Previous warning generated by XPath subexpression[%u] \"%.*s\".", exp->tok_pos[equal_exp],
(exp->tok_pos[last_equal_exp] - exp->tok_pos[equal_exp]) + exp->tok_len[last_equal_exp],
exp->expr + exp->tok_pos[equal_exp]);
}
type = ((struct lysc_node_leaf *)scnode)->type;
if (type->basetype != LY_TYPE_IDENT) {
rc = type->plugin->store(set->ctx, type, value, strlen(value), LY_TYPE_OPTS_SCHEMA,
lys_resolve_prefix, (void *)type->dflt_mod, LYD_XML, NULL, NULL, NULL, NULL, &err);
if (err) {
LOGWRN(set->ctx, "Invalid value \"%s\" which does not fit the type (%s).", value, err->msg);
ly_err_free(err);
} else if (rc != LY_SUCCESS) {
LOGWRN(set->ctx, "Invalid value \"%s\" which does not fit the type.", value);
}
if (rc != LY_SUCCESS) {
LOGWRN(set->ctx, "Previous warning generated by XPath subexpression[%u] \"%.*s\".", exp->tok_pos[equal_exp],
(exp->tok_pos[last_equal_exp] - exp->tok_pos[equal_exp]) + exp->tok_len[last_equal_exp],
exp->expr + exp->tok_pos[equal_exp]);
}
}
free(value);
}
}
/*
* XPath functions
*/
/**
* @brief Execute the YANG 1.1 bit-is-set(node-set, string) function. Returns LYXP_SET_BOOLEAN
* depending on whether the first node bit value from the second argument is set.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_bit_is_set(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
struct lyd_node_term *leaf;
struct lysc_node_leaf *sleaf;
struct lysc_type_bits *bits;
LY_ERR rc = LY_SUCCESS;
uint32_t i;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type != LYXP_SET_SCNODE_SET) || !(sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
LOGWRN(set->ctx, "Argument #1 of %s not a node-set as expected.", __func__);
} else if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_specific_type(sleaf->type, LY_TYPE_BITS)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of type \"bits\".", __func__, sleaf->name);
}
if ((args[1]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[1]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #2 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #2 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
if ((args[0]->type != LYXP_SET_NODE_SET) && (args[0]->type != LYXP_SET_EMPTY)) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INARGTYPE, 1, print_set_type(args[0]), "bit-is-set(node-set, string)");
return LY_EVALID;
}
rc = lyxp_set_cast(args[1], LYXP_SET_STRING);
LY_CHECK_RET(rc);
set_fill_boolean(set, 0);
if (args[0]->type == LYXP_SET_NODE_SET) {
leaf = (struct lyd_node_term *)args[0]->val.nodes[0].node;
if ((leaf->schema->nodetype & (LYS_LEAF | LYS_LEAFLIST))
&& (((struct lysc_node_leaf *)leaf->schema)->type->basetype == LY_TYPE_BITS)) {
bits = (struct lysc_type_bits *)((struct lysc_node_leaf *)leaf->schema)->type;
LY_ARRAY_FOR(bits->bits, i) {
if (!strcmp(bits->bits[i].name, args[1]->val.str)) {
set_fill_boolean(set, 1);
break;
}
}
}
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath boolean(object) function. Returns LYXP_SET_BOOLEAN
* with the argument converted to boolean.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_boolean(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
LY_ERR rc;
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
rc = lyxp_set_cast(args[0], LYXP_SET_BOOLEAN);
LY_CHECK_RET(rc);
set_fill_set(set, args[0]);
return LY_SUCCESS;
}
/**
* @brief Execute the XPath ceiling(number) function. Returns LYXP_SET_NUMBER
* with the first argument rounded up to the nearest integer.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_ceiling(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
struct lysc_node_leaf *sleaf;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type != LYXP_SET_SCNODE_SET) || !(sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
LOGWRN(set->ctx, "Argument #1 of %s not a node-set as expected.", __func__);
} else if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_specific_type(sleaf->type, LY_TYPE_DEC64)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of type \"decimal64\".", __func__, sleaf->name);
}
set_scnode_clear_ctx(set);
return rc;
}
rc = lyxp_set_cast(args[0], LYXP_SET_NUMBER);
LY_CHECK_RET(rc);
if ((long long)args[0]->val.num != args[0]->val.num) {
set_fill_number(set, ((long long)args[0]->val.num) + 1);
} else {
set_fill_number(set, args[0]->val.num);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath concat(string, string, string*) function.
* Returns LYXP_SET_STRING with the concatenation of all the arguments.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_concat(struct lyxp_set **args, uint16_t arg_count, struct lyxp_set *set, int options)
{
uint16_t i;
char *str = NULL;
size_t used = 1;
LY_ERR rc = LY_SUCCESS;
struct lysc_node_leaf *sleaf;
if (options & LYXP_SCNODE_ALL) {
for (i = 0; i < arg_count; ++i) {
if ((args[i]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[i]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #%u of %s is a %s node \"%s\".",
i + 1, __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #%u of %s is node \"%s\", not of string-type.", __func__, i + 1, sleaf->name);
}
}
}
set_scnode_clear_ctx(set);
return rc;
}
for (i = 0; i < arg_count; ++i) {
rc = lyxp_set_cast(args[i], LYXP_SET_STRING);
if (rc != LY_SUCCESS) {
free(str);
return rc;
}
str = ly_realloc(str, (used + strlen(args[i]->val.str)) * sizeof(char));
LY_CHECK_ERR_RET(!str, LOGMEM(set->ctx), LY_EMEM);
strcpy(str + used - 1, args[i]->val.str);
used += strlen(args[i]->val.str);
}
/* free, kind of */
lyxp_set_cast(set, LYXP_SET_EMPTY);
set->type = LYXP_SET_STRING;
set->val.str = str;
return LY_SUCCESS;
}
/**
* @brief Execute the XPath contains(string, string) function.
* Returns LYXP_SET_BOOLEAN whether the second argument can
* be found in the first or not.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_contains(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
struct lysc_node_leaf *sleaf;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
if ((args[1]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[1]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #2 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #2 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
rc = lyxp_set_cast(args[0], LYXP_SET_STRING);
LY_CHECK_RET(rc);
rc = lyxp_set_cast(args[1], LYXP_SET_STRING);
LY_CHECK_RET(rc);
if (strstr(args[0]->val.str, args[1]->val.str)) {
set_fill_boolean(set, 1);
} else {
set_fill_boolean(set, 0);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath count(node-set) function. Returns LYXP_SET_NUMBER
* with the size of the node-set from the argument.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_count(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
struct lysc_node *scnode = NULL;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type != LYXP_SET_SCNODE_SET) || !(scnode = warn_get_scnode_in_ctx(args[0]))) {
LOGWRN(set->ctx, "Argument #1 of %s not a node-set as expected.", __func__);
}
set_scnode_clear_ctx(set);
return rc;
}
if (args[0]->type == LYXP_SET_EMPTY) {
set_fill_number(set, 0);
return LY_SUCCESS;
}
if (args[0]->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INARGTYPE, 1, print_set_type(args[0]), "count(node-set)");
return LY_EVALID;
}
set_fill_number(set, args[0]->used);
return LY_SUCCESS;
}
/**
* @brief Execute the XPath current() function. Returns LYXP_SET_NODE_SET
* with the context with the intial node.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_current(struct lyxp_set **args, uint16_t arg_count, struct lyxp_set *set, int options)
{
if (arg_count || args) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INARGCOUNT, arg_count, "current()");
return LY_EVALID;
}
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
lyxp_set_scnode_insert_node(set, set->ctx_scnode, LYXP_NODE_ELEM);
} else {
lyxp_set_cast(set, LYXP_SET_EMPTY);
/* position is filled later */
set_insert_node(set, set->ctx_node, 0, LYXP_NODE_ELEM, 0);
}
return LY_SUCCESS;
}
/**
* @brief Execute the YANG 1.1 deref(node-set) function. Returns LYXP_SET_NODE_SET with either
* leafref or instance-identifier target node(s).
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_deref(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
struct lysc_ctx cctx;
struct lyd_node_term *leaf;
struct lysc_node_leaf *sleaf = NULL;
const struct lysc_node *target;
const struct lyd_node *node;
char *errmsg = NULL;
const char *val;
int dynamic;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type != LYXP_SET_SCNODE_SET) || !(sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
LOGWRN(set->ctx, "Argument #1 of %s not a node-set as expected.", __func__);
} else if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_specific_type(sleaf->type, LY_TYPE_LEAFREF) && !warn_is_specific_type(sleaf->type, LY_TYPE_INST)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of type \"leafref\" nor \"instance-identifier\".",
__func__, sleaf->name);
}
set_scnode_clear_ctx(set);
if (sleaf && (sleaf->type->basetype == LY_TYPE_LEAFREF)) {
cctx.ctx = set->ctx;
rc = lys_compile_leafref_validate(&cctx, (struct lysc_node *)sleaf, (struct lysc_type_leafref *)sleaf->type, &target);
/* it was already validated, it must succeed */
if (rc == LY_SUCCESS) {
lyxp_set_scnode_insert_node(set, target, LYXP_NODE_ELEM);
}
}
return rc;
}
if ((args[0]->type != LYXP_SET_NODE_SET) && (args[0]->type != LYXP_SET_EMPTY)) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INARGTYPE, 1, print_set_type(args[0]), "deref(node-set)");
return LY_EVALID;
}
lyxp_set_cast(set, LYXP_SET_EMPTY);
if (args[0]->type != LYXP_SET_EMPTY) {
leaf = (struct lyd_node_term *)args[0]->val.nodes[0].node;
sleaf = (struct lysc_node_leaf *)leaf->schema;
if (sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST)) {
if (sleaf->type->basetype == LY_TYPE_LEAFREF) {
/* find leafref target */
val = lyd_value2str(leaf, &dynamic);
node = ly_type_find_leafref(set->ctx, sleaf->type, val, strlen(val), (struct lyd_node *)leaf,
set->trees, &leaf->value, &errmsg);
if (dynamic) {
free((char *)val);
}
if (!node) {
LOGERR(set->ctx, LY_EINVAL, errmsg);
free(errmsg);
return LY_EINVAL;
}
/* insert it */
set_insert_node(set, node, 0, LYXP_NODE_ELEM, 0);
} else {
assert(sleaf->type->basetype == LY_TYPE_INST);
node = (struct lyd_node *)lyd_target(leaf->value.target, set->trees);
if (!node) {
val = lyd_value2str(leaf, &dynamic);
LOGERR(set->ctx, LY_EVALID, "Invalid instance-identifier \"%s\" value - required instance not found.", val);
if (dynamic) {
free((char *)val);
}
return LY_EVALID;
}
}
}
}
return LY_SUCCESS;
}
/**
* @brief Execute the YANG 1.1 derived-from(node-set, string) function. Returns LYXP_SET_BOOLEAN depending
* on whether the first argument nodes contain a node of an identity derived from the second
* argument identity.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_derived_from(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
uint16_t i;
struct lyd_node_term *leaf;
struct lysc_node_leaf *sleaf;
struct lyd_value data = {0};
struct ly_err_item *err = NULL;
LY_ERR rc = LY_SUCCESS;
int found;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type != LYXP_SET_SCNODE_SET) || !(sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
LOGWRN(set->ctx, "Argument #1 of %s not a node-set as expected.", __func__);
} else if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_specific_type(sleaf->type, LY_TYPE_IDENT)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of type \"identityref\".", __func__, sleaf->name);
}
if ((args[1]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[1]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #2 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #2 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
if ((args[0]->type != LYXP_SET_NODE_SET) && (args[0]->type != LYXP_SET_EMPTY)) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INARGTYPE, 1, print_set_type(args[0]), "derived-from(node-set, string)");
return LY_EVALID;
}
rc = lyxp_set_cast(args[1], LYXP_SET_STRING);
LY_CHECK_RET(rc);
set_fill_boolean(set, 0);
if (args[0]->type != LYXP_SET_EMPTY) {
found = 0;
for (i = 0; i < args[0]->used; ++i) {
leaf = (struct lyd_node_term *)args[0]->val.nodes[i].node;
sleaf = (struct lysc_node_leaf *)leaf->schema;
if ((sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST)) && (sleaf->type->basetype == LY_TYPE_IDENT)) {
/* store args[1] into ident */
rc = sleaf->type->plugin->store(set->ctx, sleaf->type, args[1]->val.str, strlen(args[1]->val.str),
LY_TYPE_OPTS_STORE, lys_resolve_prefix, (void *)sleaf->dflt_mod, set->format,
(struct lyd_node *)leaf, set->trees, &data, NULL, &err);
if (err) {
ly_err_print(err);
ly_err_free(err);
}
LY_CHECK_RET(rc);
LY_ARRAY_FOR(data.ident->derived, i) {
if (data.ident->derived[i] == leaf->value.ident) {
set_fill_boolean(set, 1);
found = 1;
break;
}
}
if (found) {
break;
}
}
}
}
return LY_SUCCESS;
}
/**
* @brief Execute the YANG 1.1 derived-from-or-self(node-set, string) function. Returns LYXP_SET_BOOLEAN depending
* on whether the first argument nodes contain a node of an identity that either is or is derived from
* the second argument identity.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_derived_from_or_self(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
uint16_t i;
struct lyd_node_term *leaf;
struct lysc_node_leaf *sleaf;
struct lyd_value data = {0};
struct ly_err_item *err = NULL;
LY_ERR rc = LY_SUCCESS;
int found;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type != LYXP_SET_SCNODE_SET) || !(sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
LOGWRN(set->ctx, "Argument #1 of %s not a node-set as expected.", __func__);
} else if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_specific_type(sleaf->type, LY_TYPE_IDENT)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of type \"identityref\".", __func__, sleaf->name);
}
if ((args[1]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[1]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #2 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #2 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
if ((args[0]->type != LYXP_SET_NODE_SET) && (args[0]->type != LYXP_SET_EMPTY)) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INARGTYPE, 1, print_set_type(args[0]), "derived-from-or-self(node-set, string)");
return LY_EVALID;
}
rc = lyxp_set_cast(args[1], LYXP_SET_STRING);
LY_CHECK_RET(rc);
set_fill_boolean(set, 0);
if (args[0]->type != LYXP_SET_EMPTY) {
found = 0;
for (i = 0; i < args[0]->used; ++i) {
leaf = (struct lyd_node_term *)args[0]->val.nodes[i].node;
sleaf = (struct lysc_node_leaf *)leaf->schema;
if ((sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST)) && (sleaf->type->basetype == LY_TYPE_IDENT)) {
/* store args[1] into ident */
rc = sleaf->type->plugin->store(set->ctx, sleaf->type, args[1]->val.str, strlen(args[1]->val.str),
LY_TYPE_OPTS_STORE, lys_resolve_prefix, (void *)sleaf->dflt_mod, set->format,
(struct lyd_node *)leaf, set->trees, &data, NULL, &err);
if (err) {
ly_err_print(err);
ly_err_free(err);
}
LY_CHECK_RET(rc);
if (data.ident == leaf->value.ident) {
set_fill_boolean(set, 1);
break;
}
LY_ARRAY_FOR(data.ident->derived, i) {
if (data.ident->derived[i] == leaf->value.ident) {
set_fill_boolean(set, 1);
found = 1;
break;
}
}
if (found) {
break;
}
}
}
}
return LY_SUCCESS;
}
/**
* @brief Execute the YANG 1.1 enum-value(node-set) function. Returns LYXP_SET_NUMBER
* with the integer value of the first node's enum value, otherwise NaN.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_enum_value(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
struct lyd_node_term *leaf;
struct lysc_node_leaf *sleaf;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type != LYXP_SET_SCNODE_SET) || !(sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
LOGWRN(set->ctx, "Argument #1 of %s not a node-set as expected.", __func__);
} else if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_specific_type(sleaf->type, LY_TYPE_ENUM)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of type \"enumeration\".", __func__, sleaf->name);
}
set_scnode_clear_ctx(set);
return rc;
}
if ((args[0]->type != LYXP_SET_NODE_SET) && (args[0]->type != LYXP_SET_EMPTY)) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INARGTYPE, 1, print_set_type(args[0]), "enum-value(node-set)");
return LY_EVALID;
}
set_fill_number(set, NAN);
if (args[0]->type == LYXP_SET_NODE_SET) {
leaf = (struct lyd_node_term *)args[0]->val.nodes[0].node;
sleaf = (struct lysc_node_leaf *)leaf->schema;
if ((sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST)) && (sleaf->type->basetype == LY_TYPE_ENUM)) {
set_fill_number(set, leaf->value.enum_item->value);
}
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath false() function. Returns LYXP_SET_BOOLEAN
* with false value.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_false(struct lyxp_set **UNUSED(args), uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
set_fill_boolean(set, 0);
return LY_SUCCESS;
}
/**
* @brief Execute the XPath floor(number) function. Returns LYXP_SET_NUMBER
* with the first argument floored (truncated).
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_floor(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int UNUSED(options))
{
LY_ERR rc;
rc = lyxp_set_cast(args[0], LYXP_SET_NUMBER);
LY_CHECK_RET(rc);
if (isfinite(args[0]->val.num)) {
set_fill_number(set, (long long)args[0]->val.num);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath lang(string) function. Returns LYXP_SET_BOOLEAN
* whether the language of the text matches the one from the argument.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_lang(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
const struct lyd_node *node;
struct lysc_node_leaf *sleaf;
struct lyd_attr *attr = NULL;
const char *val;
int i, dynamic;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
rc = lyxp_set_cast(args[0], LYXP_SET_STRING);
LY_CHECK_RET(rc);
if (set->type == LYXP_SET_EMPTY) {
set_fill_boolean(set, 0);
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INCTX, print_set_type(set), "lang(string)");
return LY_EVALID;
}
switch (set->val.nodes[0].type) {
case LYXP_NODE_ELEM:
case LYXP_NODE_TEXT:
node = set->val.nodes[0].node;
break;
case LYXP_NODE_ATTR:
node = set->val.attrs[0].attr->parent;
break;
default:
/* nothing to do with roots */
set_fill_boolean(set, 0);
return LY_SUCCESS;
}
/* find lang attribute */
for (; node; node = (struct lyd_node *)node->parent) {
for (attr = node->attr; attr; attr = attr->next) {
/* annotations */
if (attr->name && !strcmp(attr->name, "lang") && !strcmp(attr->annotation->module->name, "xml")) {
break;
}
}
if (attr) {
break;
}
}
/* compare languages */
if (!attr) {
set_fill_boolean(set, 0);
} else {
val = lyd_attr2str(attr, &dynamic);
for (i = 0; args[0]->val.str[i]; ++i) {
if (tolower(args[0]->val.str[i]) != tolower(val[i])) {
set_fill_boolean(set, 0);
break;
}
}
if (!args[0]->val.str[i]) {
if (!val[i] || (val[i] == '-')) {
set_fill_boolean(set, 1);
} else {
set_fill_boolean(set, 0);
}
}
if (dynamic) {
free((char *)val);
}
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath last() function. Returns LYXP_SET_NUMBER
* with the context size.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_last(struct lyxp_set **UNUSED(args), uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
if (set->type == LYXP_SET_EMPTY) {
set_fill_number(set, 0);
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INCTX, print_set_type(set), "last()");
return LY_EVALID;
}
set_fill_number(set, set->ctx_size);
return LY_SUCCESS;
}
/**
* @brief Execute the XPath local-name(node-set?) function. Returns LYXP_SET_STRING
* with the node name without namespace from the argument or the context.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_local_name(struct lyxp_set **args, uint16_t arg_count, struct lyxp_set *set, int options)
{
struct lyxp_set_node *item;
/* suppress unused variable warning */
(void)options;
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
if (arg_count) {
if (args[0]->type == LYXP_SET_EMPTY) {
set_fill_string(set, "", 0);
return LY_SUCCESS;
}
if (args[0]->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INARGTYPE, 1, print_set_type(args[0]), "local-name(node-set?)");
return LY_EVALID;
}
/* we need the set sorted, it affects the result */
assert(!set_sort(args[0]));
item = &args[0]->val.nodes[0];
} else {
if (set->type == LYXP_SET_EMPTY) {
set_fill_string(set, "", 0);
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INCTX, print_set_type(set), "local-name(node-set?)");
return LY_EVALID;
}
/* we need the set sorted, it affects the result */
assert(!set_sort(set));
item = &set->val.nodes[0];
}
switch (item->type) {
case LYXP_NODE_NONE:
LOGINT_RET(set->ctx);
case LYXP_NODE_ROOT:
case LYXP_NODE_ROOT_CONFIG:
case LYXP_NODE_TEXT:
set_fill_string(set, "", 0);
break;
case LYXP_NODE_ELEM:
set_fill_string(set, item->node->schema->name, strlen(item->node->schema->name));
break;
case LYXP_NODE_ATTR:
set_fill_string(set, ((struct lyd_attr *)item->node)->name, strlen(((struct lyd_attr *)item->node)->name));
break;
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath name(node-set?) function. Returns LYXP_SET_STRING
* with the node name fully qualified (with namespace) from the argument or the context.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_name(struct lyxp_set **args, uint16_t arg_count, struct lyxp_set *set, int options)
{
struct lyxp_set_node *item;
struct lys_module *mod;
char *str;
const char *name;
int rc;
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
if (arg_count) {
if (args[0]->type == LYXP_SET_EMPTY) {
set_fill_string(set, "", 0);
return LY_SUCCESS;
}
if (args[0]->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INARGTYPE, 1, print_set_type(args[0]), "name(node-set?)");
return LY_EVALID;
}
/* we need the set sorted, it affects the result */
assert(!set_sort(args[0]));
item = &args[0]->val.nodes[0];
} else {
if (set->type == LYXP_SET_EMPTY) {
set_fill_string(set, "", 0);
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INCTX, print_set_type(set), "name(node-set?)");
return LY_EVALID;
}
/* we need the set sorted, it affects the result */
assert(!set_sort(set));
item = &set->val.nodes[0];
}
switch (item->type) {
case LYXP_NODE_NONE:
LOGINT_RET(set->ctx);
case LYXP_NODE_ROOT:
case LYXP_NODE_ROOT_CONFIG:
case LYXP_NODE_TEXT:
mod = NULL;
name = NULL;
break;
case LYXP_NODE_ELEM:
mod = item->node->schema->module;
name = item->node->schema->name;
break;
case LYXP_NODE_ATTR:
mod = ((struct lyd_attr *)item->node)->annotation->module;
name = ((struct lyd_attr *)item->node)->name;
break;
}
if (mod && name) {
switch (set->format) {
case LYD_UNKNOWN:
rc = asprintf(&str, "%s:%s", lys_prefix_find_module(set->local_mod, mod), name);
break;
case LYD_JSON:
rc = asprintf(&str, "%s:%s", mod->name, name);
break;
default:
LOGINT_RET(set->ctx);
}
LY_CHECK_ERR_RET(rc == -1, LOGMEM(set->ctx), LY_EMEM);
set_fill_string(set, str, strlen(str));
free(str);
} else {
set_fill_string(set, "", 0);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath namespace-uri(node-set?) function. Returns LYXP_SET_STRING
* with the namespace of the node from the argument or the context.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINVAL for wrong arguments on schema)
*/
static LY_ERR
xpath_namespace_uri(struct lyxp_set **args, uint16_t arg_count, struct lyxp_set *set, int options)
{
struct lyxp_set_node *item;
struct lys_module *mod;
/* suppress unused variable warning */
(void)options;
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
if (arg_count) {
if (args[0]->type == LYXP_SET_EMPTY) {
set_fill_string(set, "", 0);
return LY_SUCCESS;
}
if (args[0]->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INARGTYPE, 1, print_set_type(args[0]), "namespace-uri(node-set?)");
return LY_EVALID;
}
/* we need the set sorted, it affects the result */
assert(!set_sort(args[0]));
item = &args[0]->val.nodes[0];
} else {
if (set->type == LYXP_SET_EMPTY) {
set_fill_string(set, "", 0);
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INCTX, print_set_type(set), "namespace-uri(node-set?)");
return LY_EVALID;
}
/* we need the set sorted, it affects the result */
assert(!set_sort(set));
item = &set->val.nodes[0];
}
switch (item->type) {
case LYXP_NODE_NONE:
LOGINT_RET(set->ctx);
case LYXP_NODE_ROOT:
case LYXP_NODE_ROOT_CONFIG:
case LYXP_NODE_TEXT:
set_fill_string(set, "", 0);
break;
case LYXP_NODE_ELEM:
case LYXP_NODE_ATTR:
if (item->type == LYXP_NODE_ELEM) {
mod = item->node->schema->module;
} else { /* LYXP_NODE_ATTR */
/* annotations */
mod = ((struct lyd_attr *)item->node)->annotation->module;
}
set_fill_string(set, mod->ns, strlen(mod->ns));
break;
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath node() function (node type). Returns LYXP_SET_NODE_SET
* with only nodes from the context. In practice it either leaves the context
* as it is or returns an empty node set.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_node(struct lyxp_set **UNUSED(args), uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
lyxp_set_cast(set, LYXP_SET_EMPTY);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath normalize-space(string?) function. Returns LYXP_SET_STRING
* with normalized value (no leading, trailing, double white spaces) of the node
* from the argument or the context.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_normalize_space(struct lyxp_set **args, uint16_t arg_count, struct lyxp_set *set, int options)
{
uint16_t i, new_used;
char *new;
int have_spaces = 0, space_before = 0;
struct lysc_node_leaf *sleaf;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if (arg_count && (args[0]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
if (arg_count) {
set_fill_set(set, args[0]);
}
rc = lyxp_set_cast(set, LYXP_SET_STRING);
LY_CHECK_RET(rc);
/* is there any normalization necessary? */
for (i = 0; set->val.str[i]; ++i) {
if (is_xmlws(set->val.str[i])) {
if ((i == 0) || space_before || (!set->val.str[i + 1])) {
have_spaces = 1;
break;
}
space_before = 1;
} else {
space_before = 0;
}
}
/* yep, there is */
if (have_spaces) {
/* it's enough, at least one character will go, makes space for ending '\0' */
new = malloc(strlen(set->val.str) * sizeof(char));
LY_CHECK_ERR_RET(!new, LOGMEM(set->ctx), LY_EMEM);
new_used = 0;
space_before = 0;
for (i = 0; set->val.str[i]; ++i) {
if (is_xmlws(set->val.str[i])) {
if ((i == 0) || space_before) {
space_before = 1;
continue;
} else {
space_before = 1;
}
} else {
space_before = 0;
}
new[new_used] = (space_before ? ' ' : set->val.str[i]);
++new_used;
}
/* at worst there is one trailing space now */
if (new_used && is_xmlws(new[new_used - 1])) {
--new_used;
}
new = ly_realloc(new, (new_used + 1) * sizeof(char));
LY_CHECK_ERR_RET(!new, LOGMEM(set->ctx), LY_EMEM);
new[new_used] = '\0';
free(set->val.str);
set->val.str = new;
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath not(boolean) function. Returns LYXP_SET_BOOLEAN
* with the argument converted to boolean and logically inverted.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_not(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
lyxp_set_cast(args[0], LYXP_SET_BOOLEAN);
if (args[0]->val.bool) {
set_fill_boolean(set, 0);
} else {
set_fill_boolean(set, 1);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath number(object?) function. Returns LYXP_SET_NUMBER
* with the number representation of either the argument or the context.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_number(struct lyxp_set **args, uint16_t arg_count, struct lyxp_set *set, int options)
{
LY_ERR rc;
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
if (arg_count) {
rc = lyxp_set_cast(args[0], LYXP_SET_NUMBER);
LY_CHECK_RET(rc);
set_fill_set(set, args[0]);
} else {
rc = lyxp_set_cast(set, LYXP_SET_NUMBER);
LY_CHECK_RET(rc);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath position() function. Returns LYXP_SET_NUMBER
* with the context position.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_position(struct lyxp_set **UNUSED(args), uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
if (set->type == LYXP_SET_EMPTY) {
set_fill_number(set, 0);
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INCTX, print_set_type(set), "position()");
return LY_EVALID;
}
set_fill_number(set, set->ctx_pos);
/* UNUSED in 'Release' build type */
(void)options;
return LY_SUCCESS;
}
/**
* @brief Execute the YANG 1.1 re-match(string, string) function. Returns LYXP_SET_BOOLEAN
* depending on whether the second argument regex matches the first argument string. For details refer to
* YANG 1.1 RFC section 10.2.1.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_re_match(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
struct lysc_pattern **patterns = NULL, **pattern;
struct lysc_node_leaf *sleaf;
char *path;
LY_ERR rc = LY_SUCCESS;
struct ly_err_item *err;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
if ((args[1]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[1]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #2 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #2 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
rc = lyxp_set_cast(args[0], LYXP_SET_STRING);
LY_CHECK_RET(rc);
rc = lyxp_set_cast(args[1], LYXP_SET_STRING);
LY_CHECK_RET(rc);
LY_ARRAY_NEW_RET(set->ctx, patterns, pattern, LY_EMEM);
*pattern = malloc(sizeof **pattern);
path = lyd_path(set->ctx_node, LYD_PATH_LOG, NULL, 0);
rc = lys_compile_type_pattern_check(set->ctx, path, args[1]->val.str, &(*pattern)->code);
free(path);
if (rc != LY_SUCCESS) {
LY_ARRAY_FREE(patterns);
return rc;
}
rc = ly_type_validate_patterns(patterns, args[0]->val.str, strlen(args[0]->val.str), &err);
pcre2_code_free((*pattern)->code);
free(*pattern);
LY_ARRAY_FREE(patterns);
if (rc && (rc != LY_EVALID)) {
ly_err_print(err);
ly_err_free(err);
return rc;
}
if (rc == LY_EVALID) {
ly_err_free(err);
set_fill_boolean(set, 0);
} else {
set_fill_boolean(set, 1);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath round(number) function. Returns LYXP_SET_NUMBER
* with the rounded first argument. For details refer to
* http://www.w3.org/TR/1999/REC-xpath-19991116/#function-round.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_round(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
struct lysc_node_leaf *sleaf;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type != LYXP_SET_SCNODE_SET) || !(sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
LOGWRN(set->ctx, "Argument #1 of %s not a node-set as expected.", __func__);
} else if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_specific_type(sleaf->type, LY_TYPE_DEC64)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of type \"decimal64\".", __func__, sleaf->name);
}
set_scnode_clear_ctx(set);
return rc;
}
rc = lyxp_set_cast(args[0], LYXP_SET_NUMBER);
LY_CHECK_RET(rc);
/* cover only the cases where floor can't be used */
if ((args[0]->val.num == -0.0f) || ((args[0]->val.num < 0) && (args[0]->val.num >= -0.5))) {
set_fill_number(set, -0.0f);
} else {
args[0]->val.num += 0.5;
rc = xpath_floor(args, 1, args[0], options);
LY_CHECK_RET(rc);
set_fill_number(set, args[0]->val.num);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath starts-with(string, string) function.
* Returns LYXP_SET_BOOLEAN whether the second argument is
* the prefix of the first or not.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_starts_with(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
struct lysc_node_leaf *sleaf;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
if ((args[1]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[1]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #2 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #2 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
rc = lyxp_set_cast(args[0], LYXP_SET_STRING);
LY_CHECK_RET(rc);
rc = lyxp_set_cast(args[1], LYXP_SET_STRING);
LY_CHECK_RET(rc);
if (strncmp(args[0]->val.str, args[1]->val.str, strlen(args[1]->val.str))) {
set_fill_boolean(set, 0);
} else {
set_fill_boolean(set, 1);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath string(object?) function. Returns LYXP_SET_STRING
* with the string representation of either the argument or the context.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_string(struct lyxp_set **args, uint16_t arg_count, struct lyxp_set *set, int options)
{
LY_ERR rc;
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
if (arg_count) {
rc = lyxp_set_cast(args[0], LYXP_SET_STRING);
LY_CHECK_RET(rc);
set_fill_set(set, args[0]);
} else {
rc = lyxp_set_cast(set, LYXP_SET_STRING);
LY_CHECK_RET(rc);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath string-length(string?) function. Returns LYXP_SET_NUMBER
* with the length of the string in either the argument or the context.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_string_length(struct lyxp_set **args, uint16_t arg_count, struct lyxp_set *set, int options)
{
struct lysc_node_leaf *sleaf;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if (arg_count && (args[0]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
if (!arg_count && (set->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(set))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #0 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #0 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
if (arg_count) {
rc = lyxp_set_cast(args[0], LYXP_SET_STRING);
LY_CHECK_RET(rc);
set_fill_number(set, strlen(args[0]->val.str));
} else {
rc = lyxp_set_cast(set, LYXP_SET_STRING);
LY_CHECK_RET(rc);
set_fill_number(set, strlen(set->val.str));
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath substring(string, number, number?) function.
* Returns LYXP_SET_STRING substring of the first argument starting
* on the second argument index ending on the third argument index,
* indexed from 1. For exact definition refer to
* http://www.w3.org/TR/1999/REC-xpath-19991116/#function-substring.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_substring(struct lyxp_set **args, uint16_t arg_count, struct lyxp_set *set, int options)
{
int start, len;
uint16_t str_start, str_len, pos;
struct lysc_node_leaf *sleaf;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
if ((args[1]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[1]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #2 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_numeric_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #2 of %s is node \"%s\", not of numeric type.", __func__, sleaf->name);
}
}
if ((arg_count == 3) && (args[2]->type == LYXP_SET_SCNODE_SET)
&& (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[2]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #3 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_numeric_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #3 of %s is node \"%s\", not of numeric type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
rc = lyxp_set_cast(args[0], LYXP_SET_STRING);
LY_CHECK_RET(rc);
/* start */
if (xpath_round(&args[1], 1, args[1], options)) {
return -1;
}
if (isfinite(args[1]->val.num)) {
start = args[1]->val.num - 1;
} else if (isinf(args[1]->val.num) && signbit(args[1]->val.num)) {
start = INT_MIN;
} else {
start = INT_MAX;
}
/* len */
if (arg_count == 3) {
rc = xpath_round(&args[2], 1, args[2], options);
LY_CHECK_RET(rc);
if (isfinite(args[2]->val.num)) {
len = args[2]->val.num;
} else if (isnan(args[2]->val.num) || signbit(args[2]->val.num)) {
len = 0;
} else {
len = INT_MAX;
}
} else {
len = INT_MAX;
}
/* find matching character positions */
str_start = 0;
str_len = 0;
for (pos = 0; args[0]->val.str[pos]; ++pos) {
if (pos < start) {
++str_start;
} else if (pos < start + len) {
++str_len;
} else {
break;
}
}
set_fill_string(set, args[0]->val.str + str_start, str_len);
return LY_SUCCESS;
}
/**
* @brief Execute the XPath substring-after(string, string) function.
* Returns LYXP_SET_STRING with the string succeeding the occurance
* of the second argument in the first or an empty string.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_substring_after(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
char *ptr;
struct lysc_node_leaf *sleaf;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
if ((args[1]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[1]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #2 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #2 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
rc = lyxp_set_cast(args[0], LYXP_SET_STRING);
LY_CHECK_RET(rc);
rc = lyxp_set_cast(args[1], LYXP_SET_STRING);
LY_CHECK_RET(rc);
ptr = strstr(args[0]->val.str, args[1]->val.str);
if (ptr) {
set_fill_string(set, ptr + strlen(args[1]->val.str), strlen(ptr + strlen(args[1]->val.str)));
} else {
set_fill_string(set, "", 0);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath substring-before(string, string) function.
* Returns LYXP_SET_STRING with the string preceding the occurance
* of the second argument in the first or an empty string.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_substring_before(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
char *ptr;
struct lysc_node_leaf *sleaf;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
if ((args[1]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[1]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #2 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #2 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
rc = lyxp_set_cast(args[0], LYXP_SET_STRING);
LY_CHECK_RET(rc);
rc = lyxp_set_cast(args[1], LYXP_SET_STRING);
LY_CHECK_RET(rc);
ptr = strstr(args[0]->val.str, args[1]->val.str);
if (ptr) {
set_fill_string(set, args[0]->val.str, ptr - args[0]->val.str);
} else {
set_fill_string(set, "", 0);
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath sum(node-set) function. Returns LYXP_SET_NUMBER
* with the sum of all the nodes in the context.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_sum(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
long double num;
char *str;
uint16_t i;
struct lyxp_set set_item;
struct lysc_node_leaf *sleaf;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if (args[0]->type == LYXP_SET_SCNODE_SET) {
for (i = 0; i < args[0]->used; ++i) {
if (args[0]->val.scnodes[i].in_ctx == 1) {
sleaf = (struct lysc_node_leaf *)args[0]->val.scnodes[i].scnode;
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__,
lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_numeric_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of numeric type.", __func__, sleaf->name);
}
}
}
}
set_scnode_clear_ctx(set);
return rc;
}
set_fill_number(set, 0);
if (args[0]->type == LYXP_SET_EMPTY) {
return LY_SUCCESS;
}
if (args[0]->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INARGTYPE, 1, print_set_type(args[0]), "sum(node-set)");
return LY_EVALID;
}
set_init(&set_item, set);
set_item.type = LYXP_SET_NODE_SET;
set_item.val.nodes = malloc(sizeof *set_item.val.nodes);
LY_CHECK_ERR_RET(!set_item.val.nodes, LOGMEM(set->ctx), LY_EMEM);
set_item.used = 1;
set_item.size = 1;
for (i = 0; i < args[0]->used; ++i) {
set_item.val.nodes[0] = args[0]->val.nodes[i];
rc = cast_node_set_to_string(&set_item, &str);
LY_CHECK_RET(rc);
num = cast_string_to_number(str);
free(str);
set->val.num += num;
}
free(set_item.val.nodes);
return LY_SUCCESS;
}
/**
* @brief Execute the XPath text() function (node type). Returns LYXP_SET_NODE_SET
* with the text content of the nodes in the context.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_text(struct lyxp_set **UNUSED(args), uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
uint32_t i;
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
if (set->type == LYXP_SET_EMPTY) {
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INCTX, print_set_type(set), "text()");
return LY_EVALID;
}
for (i = 0; i < set->used;) {
switch (set->val.nodes[i].type) {
case LYXP_NODE_NONE:
LOGINT_RET(set->ctx);
case LYXP_NODE_ELEM:
if (set->val.nodes[i].node->schema->nodetype & (LYS_LEAF | LYS_LEAFLIST)) {
set->val.nodes[i].type = LYXP_NODE_TEXT;
++i;
break;
}
/* fall through */
case LYXP_NODE_ROOT:
case LYXP_NODE_ROOT_CONFIG:
case LYXP_NODE_TEXT:
case LYXP_NODE_ATTR:
set_remove_node(set, i);
break;
}
}
return LY_SUCCESS;
}
/**
* @brief Execute the XPath translate(string, string, string) function.
* Returns LYXP_SET_STRING with the first argument with the characters
* from the second argument replaced by those on the corresponding
* positions in the third argument.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_translate(struct lyxp_set **args, uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
uint16_t i, j, new_used;
char *new;
int found, have_removed;
struct lysc_node_leaf *sleaf;
LY_ERR rc = LY_SUCCESS;
if (options & LYXP_SCNODE_ALL) {
if ((args[0]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[0]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #1 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #1 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
if ((args[1]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[1]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #2 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #2 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
if ((args[2]->type == LYXP_SET_SCNODE_SET) && (sleaf = (struct lysc_node_leaf *)warn_get_scnode_in_ctx(args[2]))) {
if (!(sleaf->nodetype & (LYS_LEAF | LYS_LEAFLIST))) {
LOGWRN(set->ctx, "Argument #3 of %s is a %s node \"%s\".", __func__, lys_nodetype2str(sleaf->nodetype), sleaf->name);
} else if (!warn_is_string_type(sleaf->type)) {
LOGWRN(set->ctx, "Argument #3 of %s is node \"%s\", not of string-type.", __func__, sleaf->name);
}
}
set_scnode_clear_ctx(set);
return rc;
}
rc = lyxp_set_cast(args[0], LYXP_SET_STRING);
LY_CHECK_RET(rc);
rc = lyxp_set_cast(args[1], LYXP_SET_STRING);
LY_CHECK_RET(rc);
rc = lyxp_set_cast(args[2], LYXP_SET_STRING);
LY_CHECK_RET(rc);
new = malloc((strlen(args[0]->val.str) + 1) * sizeof(char));
LY_CHECK_ERR_RET(!new, LOGMEM(set->ctx), LY_EMEM);
new_used = 0;
have_removed = 0;
for (i = 0; args[0]->val.str[i]; ++i) {
found = 0;
for (j = 0; args[1]->val.str[j]; ++j) {
if (args[0]->val.str[i] == args[1]->val.str[j]) {
/* removing this char */
if (j >= strlen(args[2]->val.str)) {
have_removed = 1;
found = 1;
break;
}
/* replacing this char */
new[new_used] = args[2]->val.str[j];
++new_used;
found = 1;
break;
}
}
/* copying this char */
if (!found) {
new[new_used] = args[0]->val.str[i];
++new_used;
}
}
if (have_removed) {
new = ly_realloc(new, (new_used + 1) * sizeof(char));
LY_CHECK_ERR_RET(!new, LOGMEM(set->ctx), LY_EMEM);
}
new[new_used] = '\0';
lyxp_set_cast(set, LYXP_SET_EMPTY);
set->type = LYXP_SET_STRING;
set->val.str = new;
return LY_SUCCESS;
}
/**
* @brief Execute the XPath true() function. Returns LYXP_SET_BOOLEAN
* with true value.
*
* @param[in] args Array of arguments.
* @param[in] arg_count Count of elements in @p args.
* @param[in,out] set Context and result set at the same time.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
xpath_true(struct lyxp_set **UNUSED(args), uint16_t UNUSED(arg_count), struct lyxp_set *set, int options)
{
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
return LY_SUCCESS;
}
set_fill_boolean(set, 1);
return LY_SUCCESS;
}
/*
* moveto functions
*
* They and only they actually change the context (set).
*/
/**
* @brief Skip prefix and return corresponding model if there is a prefix. Logs directly.
*
* @param[in,out] qname Qualified node name. If includes prefix, it is skipped.
* @param[in,out] qname_len Length of @p qname, is updated accordingly.
* @param[in] set Set with XPath context.
* @param[out] moveto_mod Expected module of a matching node.
* @return LY_ERR
*/
static LY_ERR
moveto_resolve_model(const char **qname, uint16_t *qname_len, struct lyxp_set *set, const struct lys_module **moveto_mod)
{
const struct lys_module *mod;
const char *ptr;
int pref_len;
char *str;
if ((ptr = ly_strnchr(*qname, ':', *qname_len))) {
/* specific module */
pref_len = ptr - *qname;
switch (set->format) {
case LYD_UNKNOWN:
/* schema, search all local module imports */
mod = lys_module_find_prefix(set->local_mod, *qname, pref_len);
break;
case LYD_JSON:
/* JSON data, search in context */
str = strndup(*qname, pref_len);
mod = ly_ctx_get_module(set->ctx, str, NULL);
free(str);
break;
default:
LOGINT_RET(set->ctx);
}
/* Check for errors and non-implemented modules, as they are not valid */
if (!mod || !mod->implemented) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INMOD, pref_len, *qname);
return LY_EVALID;
}
*qname += pref_len + 1;
*qname_len -= pref_len + 1;
} else if (((*qname)[0] == '*') && (*qname_len == 1)) {
/* all modules - special case */
mod = NULL;
} else {
/* local module */
mod = set->local_mod;
}
*moveto_mod = mod;
return LY_SUCCESS;
}
/**
* @brief Move context @p set to the root. Handles absolute path.
* Result is LYXP_SET_NODE_SET.
*
* @param[in,out] set Set to use.
* @param[in] options Xpath options.
*/
static void
moveto_root(struct lyxp_set *set, int options)
{
if (!set) {
return;
}
if (options & LYXP_SCNODE_ALL) {
set_scnode_clear_ctx(set);
lyxp_set_scnode_insert_node(set, NULL, set->root_type);
} else {
lyxp_set_cast(set, LYXP_SET_EMPTY);
set_insert_node(set, NULL, 0, set->root_type, 0);
}
}
/**
* @brief Check whether a node has some unresolved "when".
*
* @param[in] node Node to check.
* @return LY_ERR value (LY_EINCOMPLETE if there are some unresolved "when")
*/
static LY_ERR
moveto_when_check(const struct lyd_node *node)
{
const struct lysc_node *schema;
if (!node) {
return LY_SUCCESS;
}
schema = node->schema;
do {
if (schema->when && !(node->flags & LYD_WHEN_TRUE)) {
return LY_EINCOMPLETE;
}
schema = schema->parent;
} while (schema && (schema->nodetype & (LYS_CASE | LYS_CHOICE)));
return LY_SUCCESS;
}
/**
* @brief Check @p node as a part of NameTest processing.
*
* @param[in] node Node to check.
* @param[in] root_type XPath root node type.
* @param[in] node_name Node name to move to. Must be in the dictionary!
* @param[in] moveto_mod Expected module of the node.
* @return LY_ERR (LY_ENOT if node does not match, LY_EINCOMPLETE on unresolved when,
* LY_EINVAL if netither node nor any children match)
*/
static LY_ERR
moveto_node_check(const struct lyd_node *node, enum lyxp_node_type root_type, const char *node_name,
const struct lys_module *moveto_mod)
{
/* module check */
if (moveto_mod && (node->schema->module != moveto_mod)) {
return LY_ENOT;
}
/* context check */
if ((root_type == LYXP_NODE_ROOT_CONFIG) && (node->schema->flags & LYS_CONFIG_R)) {
return LY_EINVAL;
}
/* name check */
if (strcmp(node_name, "*") && (node->schema->name != node_name)) {
return LY_ENOT;
}
/* when check */
if (moveto_when_check(node)) {
return LY_EINCOMPLETE;
}
/* match */
return LY_SUCCESS;
}
/**
* @brief Check @p node as a part of schema NameTest processing.
*
* @param[in] node Schema node to check.
* @param[in] root_type XPath root node type.
* @param[in] node_name Node name to move to. Must be in the dictionary!
* @param[in] moveto_mod Expected module of the node.
* @return LY_ERR (LY_ENOT if node does not match, LY_EINVAL if neither node nor any children match)
*/
static LY_ERR
moveto_scnode_check(const struct lysc_node *node, enum lyxp_node_type root_type, const char *node_name,
const struct lys_module *moveto_mod)
{
/* module check */
if (strcmp(node_name, "*") && (node->module != moveto_mod)) {
return LY_ENOT;
}
/* context check */
if ((root_type == LYXP_NODE_ROOT_CONFIG) && (node->flags & LYS_CONFIG_R)) {
return LY_EINVAL;
}
/* name check */
if (strcmp(node_name, "*") && (node->name != node_name)) {
return LY_ENOT;
}
/* match */
return LY_SUCCESS;
}
/**
* @brief Move context @p set to a node. Handles '/' and '*', 'NAME', 'PREFIX:*', or 'PREFIX:NAME'.
* Result is LYXP_SET_NODE_SET (or LYXP_SET_EMPTY). Context position aware.
*
* @param[in,out] set Set to use.
* @param[in] qname Qualified node name to move to.
* @param[in] qname_len Length of @p qname.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
moveto_node(struct lyxp_set *set, const char *qname, uint16_t qname_len)
{
uint32_t i, j;
int replaced;
const char *name_dict = NULL; /* optimization - so we can do (==) instead (!strncmp(...)) in moveto_node_check() */
const struct lys_module *moveto_mod;
const struct lyd_node *sub;
LY_ERR rc;
if (!set || (set->type == LYXP_SET_EMPTY)) {
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INOP_1, "path operator", print_set_type(set));
return LY_EVALID;
}
rc = moveto_resolve_model(&qname, &qname_len, set, &moveto_mod);
LY_CHECK_RET(rc);
/* name */
name_dict = lydict_insert(set->ctx, qname, qname_len);
for (i = 0; i < set->used; ) {
replaced = 0;
if ((set->val.nodes[i].type == LYXP_NODE_ROOT_CONFIG) || (set->val.nodes[i].type == LYXP_NODE_ROOT)) {
assert(!set->val.nodes[i].node);
/* search in all the trees */
LY_ARRAY_FOR(set->trees, j) {
for (sub = set->trees[j]; sub; sub = sub->next) {
rc = moveto_node_check(sub, set->root_type, name_dict, moveto_mod);
if (rc == LY_SUCCESS) {
/* pos filled later */
if (!replaced) {
set_replace_node(set, sub, 0, LYXP_NODE_ELEM, i);
replaced = 1;
} else {
set_insert_node(set, sub, 0, LYXP_NODE_ELEM, i);
}
++i;
} else if (rc == LY_EINCOMPLETE) {
lydict_remove(set->ctx, name_dict);
return rc;
}
}
}
/* skip nodes without children - leaves, leaflists, anyxmls (ouput root will eval to true) */
} else if (!(set->val.nodes[i].node->schema->nodetype & (LYS_LEAF | LYS_LEAFLIST | LYS_ANYDATA))) {
for (sub = lyd_node_children(set->val.nodes[i].node); sub; sub = sub->next) {
rc = moveto_node_check(sub, set->root_type, name_dict, moveto_mod);
if (rc == LY_SUCCESS) {
if (!replaced) {
set_replace_node(set, sub, 0, LYXP_NODE_ELEM, i);
replaced = 1;
} else {
set_insert_node(set, sub, 0, LYXP_NODE_ELEM, i);
}
++i;
} else if (rc == LY_EINCOMPLETE) {
lydict_remove(set->ctx, name_dict);
return rc;
}
}
}
if (!replaced) {
/* no match */
set_remove_node(set, i);
}
}
lydict_remove(set->ctx, name_dict);
return LY_SUCCESS;
}
/**
* @brief Move context @p set to a schema node. Handles '/' and '*', 'NAME', 'PREFIX:*', or 'PREFIX:NAME'.
* Result is LYXP_SET_SCNODE_SET (or LYXP_SET_EMPTY).
*
* @param[in,out] set Set to use.
* @param[in] qname Qualified node name to move to.
* @param[in] qname_len Length of @p qname.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
moveto_scnode(struct lyxp_set *set, const char *qname, uint16_t qname_len, int options)
{
int i, orig_used, idx, temp_ctx = 0, getnext_opts;
uint32_t mod_idx;
const char *name_dict = NULL; /* optimization - so we can do (==) instead (!strncmp(...)) in moveto_node_check() */
const struct lys_module *moveto_mod;
const struct lysc_node *sub, *start_parent;
LY_ERR rc;
if (!set || (set->type == LYXP_SET_EMPTY)) {
return LY_SUCCESS;
}
if (set->type != LYXP_SET_SCNODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYSC, set->ctx_scnode, LY_VCODE_XP_INOP_1, "path operator", print_set_type(set));
return LY_EVALID;
}
rc = moveto_resolve_model(&qname, &qname_len, set, &moveto_mod);
LY_CHECK_RET(rc);
/* name */
name_dict = lydict_insert(set->ctx, qname, qname_len);
/* getnext opts */
getnext_opts = LYS_GETNEXT_NOSTATECHECK;
if (options & LYXP_SCNODE_OUTPUT) {
getnext_opts |= LYS_GETNEXT_OUTPUT;
}
orig_used = set->used;
for (i = 0; i < orig_used; ++i) {
if (set->val.scnodes[i].in_ctx != 1) {
if (set->val.scnodes[i].in_ctx != -2) {
continue;
}
/* remember context node */
set->val.scnodes[i].in_ctx = -1;
} else {
set->val.scnodes[i].in_ctx = 0;
}
start_parent = set->val.scnodes[i].scnode;
if ((set->val.scnodes[i].type == LYXP_NODE_ROOT_CONFIG) || (set->val.scnodes[i].type == LYXP_NODE_ROOT)) {
/* it can actually be in any module, it's all <running>, but we know it's moveto_mod (if set),
* so use it directly (root node itself is useless in this case) */
mod_idx = 0;
while (moveto_mod || (moveto_mod = (struct lys_module *)ly_ctx_get_module_iter(set->ctx, &mod_idx))) {
sub = NULL;
/* module may not be implemented */
while (moveto_mod->implemented && (sub = lys_getnext(sub, NULL, moveto_mod->compiled, getnext_opts))) {
if (!moveto_scnode_check(sub, set->root_type, name_dict, moveto_mod)) {
idx = lyxp_set_scnode_insert_node(set, sub, LYXP_NODE_ELEM);
/* we need to prevent these nodes from being considered in this moveto */
if ((idx < orig_used) && (idx > i)) {
set->val.scnodes[idx].in_ctx = 2;
temp_ctx = 1;
}
}
}
if (!mod_idx) {
/* moveto_mod was specified, we are not going through the whole context */
break;
}
/* next iteration */
moveto_mod = NULL;
}
/* skip nodes without children - leaves, leaflists, and anyxmls (ouput root will eval to true) */
} else if (!(start_parent->nodetype & (LYS_LEAF | LYS_LEAFLIST | LYS_ANYDATA))) {
sub = NULL;
while ((sub = lys_getnext(sub, start_parent, NULL, getnext_opts))) {
if (!moveto_scnode_check(sub, set->root_type, name_dict, (moveto_mod ? moveto_mod : set->local_mod))) {
idx = lyxp_set_scnode_insert_node(set, sub, LYXP_NODE_ELEM);
if ((idx < orig_used) && (idx > i)) {
set->val.scnodes[idx].in_ctx = 2;
temp_ctx = 1;
}
}
}
}
}
lydict_remove(set->ctx, name_dict);
/* correct temporary in_ctx values */
if (temp_ctx) {
for (i = 0; i < orig_used; ++i) {
if (set->val.scnodes[i].in_ctx == 2) {
set->val.scnodes[i].in_ctx = 1;
}
}
}
return LY_SUCCESS;
}
/**
* @brief Move context @p set to a node and all its descendants. Handles '//' and '*', 'NAME',
* 'PREFIX:*', or 'PREFIX:NAME'. Result is LYXP_SET_NODE_SET (or LYXP_SET_EMPTY).
* Context position aware.
*
* @param[in] set Set to use.
* @param[in] qname Qualified node name to move to.
* @param[in] qname_len Length of @p qname.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
moveto_node_alldesc(struct lyxp_set *set, const char *qname, uint16_t qname_len)
{
uint32_t i;
const char *name_dict = NULL; /* optimization - so we can do (==) instead (!strncmp(...)) in moveto_node_check() */
const struct lyd_node *next, *elem, *start;
const struct lys_module *moveto_mod;
struct lyxp_set ret_set;
LY_ERR rc;
if (!set || (set->type == LYXP_SET_EMPTY)) {
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INOP_1, "path operator", print_set_type(set));
return LY_EVALID;
}
rc = moveto_resolve_model(&qname, &qname_len, set, &moveto_mod);
LY_CHECK_RET(rc);
/* replace the original nodes (and throws away all text and attr nodes, root is replaced by a child) */
rc = moveto_node(set, "*", 1);
LY_CHECK_RET(rc);
/* name */
name_dict = lydict_insert(set->ctx, qname, qname_len);
/* this loop traverses all the nodes in the set and adds/keeps only those that match qname */
set_init(&ret_set, set);
for (i = 0; i < set->used; ++i) {
/* TREE DFS */
start = set->val.nodes[i].node;
for (elem = next = start; elem; elem = next) {
rc = moveto_node_check(elem, set->root_type, name_dict, moveto_mod);
if (!rc) {
/* add matching node into result set */
set_insert_node(&ret_set, elem, 0, LYXP_NODE_ELEM, ret_set.used);
if (set_dup_node_check(set, elem, LYXP_NODE_ELEM, i)) {
/* the node is a duplicate, we'll process it later in the set */
goto skip_children;
}
} else if (rc == LY_EINCOMPLETE) {
lydict_remove(set->ctx, name_dict);
return rc;
} else if (rc == LY_EINVAL) {
goto skip_children;
}
/* TREE DFS NEXT ELEM */
/* select element for the next run - children first */
if (elem->schema->nodetype & (LYS_LEAF | LYS_LEAFLIST | LYS_ANYDATA)) {
next = NULL;
} else {
next = lyd_node_children(elem);
}
if (!next) {
skip_children:
/* no children, so try siblings, but only if it's not the start,
* that is considered to be the root and it's siblings are not traversed */
if (elem != start) {
next = elem->next;
} else {
break;
}
}
while (!next) {
/* no siblings, go back through the parents */
if ((struct lyd_node *)elem->parent == start) {
/* we are done, no next element to process */
break;
}
/* parent is already processed, go to its sibling */
elem = (struct lyd_node *)elem->parent;
next = elem->next;
}
}
}
/* make the temporary set the current one */
ret_set.ctx_pos = set->ctx_pos;
ret_set.ctx_size = set->ctx_size;
set_free_content(set);
memcpy(set, &ret_set, sizeof *set);
lydict_remove(set->ctx, name_dict);
return LY_SUCCESS;
}
/**
* @brief Move context @p set to a schema node and all its descendants. Handles '//' and '*', 'NAME',
* 'PREFIX:*', or 'PREFIX:NAME'. Result is LYXP_SET_NODE_SET (or LYXP_SET_EMPTY).
*
* @param[in] set Set to use.
* @param[in] qname Qualified node name to move to.
* @param[in] qname_len Length of @p qname.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
moveto_scnode_alldesc(struct lyxp_set *set, const char *qname, uint16_t qname_len, int options)
{
int i, orig_used, idx;
const struct lysc_node *next, *elem, *start;
const struct lys_module *moveto_mod;
LY_ERR rc;
if (!set || (set->type == LYXP_SET_EMPTY)) {
return LY_SUCCESS;
}
if (set->type != LYXP_SET_SCNODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYSC, set->ctx_scnode, LY_VCODE_XP_INOP_1, "path operator", print_set_type(set));
return LY_EVALID;
}
rc = moveto_resolve_model(&qname, &qname_len, set, &moveto_mod);
LY_CHECK_RET(rc);
orig_used = set->used;
for (i = 0; i < orig_used; ++i) {
if (set->val.scnodes[i].in_ctx != 1) {
if (set->val.scnodes[i].in_ctx != -2) {
continue;
}
/* remember context node */
set->val.scnodes[i].in_ctx = -1;
} else {
set->val.scnodes[i].in_ctx = 0;
}
/* TREE DFS */
start = set->val.scnodes[i].scnode;
for (elem = next = start; elem; elem = next) {
if ((elem == start) || (elem->nodetype & (LYS_CHOICE | LYS_CASE))) {
/* schema-only nodes, skip root */
goto next_iter;
}
rc = moveto_scnode_check(elem, set->root_type, qname, moveto_mod);
if (!rc) {
if ((idx = lyxp_set_scnode_dup_node_check(set, elem, LYXP_NODE_ELEM, i)) > -1) {
set->val.scnodes[idx].in_ctx = 1;
if (idx > i) {
/* we will process it later in the set */
goto skip_children;
}
} else {
lyxp_set_scnode_insert_node(set, elem, LYXP_NODE_ELEM);
}
} else if (rc == LY_EINVAL) {
goto skip_children;
}
next_iter:
/* TREE DFS NEXT ELEM */
/* select element for the next run - children first */
next = lysc_node_children(elem, options & LYXP_SCNODE_OUTPUT ? LYS_CONFIG_R : LYS_CONFIG_W);
if (elem->nodetype & (LYS_LEAF | LYS_LEAFLIST | LYS_ANYDATA)) {
next = NULL;
}
if (!next) {
skip_children:
/* no children, so try siblings, but only if it's not the start,
* that is considered to be the root and it's siblings are not traversed */
if (elem != start) {
next = elem->next;
} else {
break;
}
}
while (!next) {
/* no siblings, go back through the parents */
if (elem->parent == start) {
/* we are done, no next element to process */
break;
}
/* parent is already processed, go to its sibling */
elem = elem->parent;
next = elem->next;
}
}
}
return LY_SUCCESS;
}
/**
* @brief Move context @p set to an attribute. Handles '/' and '@*', '@NAME', '@PREFIX:*',
* or '@PREFIX:NAME'. Result is LYXP_SET_NODE_SET (or LYXP_SET_EMPTY).
* Indirectly context position aware.
*
* @param[in,out] set Set to use.
* @param[in] qname Qualified node name to move to.
* @param[in] qname_len Length of @p qname.
* @return LY_ERR
*/
static LY_ERR
moveto_attr(struct lyxp_set *set, const char *qname, uint16_t qname_len)
{
uint32_t i;
int replaced, all = 0;
const struct lys_module *moveto_mod;
struct lyd_attr *sub;
LY_ERR rc;
if (!set || (set->type == LYXP_SET_EMPTY)) {
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INOP_1, "path operator", print_set_type(set));
return LY_EVALID;
}
rc = moveto_resolve_model(&qname, &qname_len, set, &moveto_mod);
LY_CHECK_RET(rc);
if ((qname_len == 1) && (qname[0] == '*')) {
all = 1;
}
for (i = 0; i < set->used; ) {
replaced = 0;
/* only attributes of an elem (not dummy) can be in the result, skip all the rest;
* our attributes are always qualified */
if (set->val.nodes[i].type == LYXP_NODE_ELEM) {
for (sub = set->val.nodes[i].node->attr; sub; sub = sub->next) {
/* check "namespace" */
if (moveto_mod && (sub->annotation->module != moveto_mod)) {
continue;
}
if (all || (!strncmp(sub->name, qname, qname_len) && !sub->name[qname_len])) {
/* match */
if (!replaced) {
set->val.attrs[i].attr = sub;
set->val.attrs[i].type = LYXP_NODE_ATTR;
/* pos does not change */
replaced = 1;
} else {
set_insert_node(set, (struct lyd_node *)sub, set->val.nodes[i].pos, LYXP_NODE_ATTR, i + 1);
}
++i;
}
}
}
if (!replaced) {
/* no match */
set_remove_node(set, i);
}
}
return LY_SUCCESS;
}
/**
* @brief Move context @p set1 to union with @p set2. @p set2 is emptied afterwards.
* Result is LYXP_SET_NODE_SET (or LYXP_SET_EMPTY). Context position aware.
*
* @param[in,out] set1 Set to use for the result.
* @param[in] set2 Set that is copied to @p set1.
* @return LY_ERR
*/
static LY_ERR
moveto_union(struct lyxp_set *set1, struct lyxp_set *set2)
{
LY_ERR rc;
if (((set1->type != LYXP_SET_NODE_SET) && (set1->type != LYXP_SET_EMPTY))
|| ((set2->type != LYXP_SET_NODE_SET) && (set2->type != LYXP_SET_EMPTY))) {
LOGVAL(set1->ctx, LY_VLOG_LYD, set1->ctx_node, LY_VCODE_XP_INOP_2, "union", print_set_type(set1), print_set_type(set2));
return LY_EVALID;
}
/* set2 is empty or both set1 and set2 */
if (set2->type == LYXP_SET_EMPTY) {
return LY_SUCCESS;
}
if (set1->type == LYXP_SET_EMPTY) {
memcpy(set1, set2, sizeof *set1);
/* dynamic memory belongs to set1 now, do not free */
set2->type = LYXP_SET_EMPTY;
return LY_SUCCESS;
}
/* we assume sets are sorted */
assert(!set_sort(set1) && !set_sort(set2));
/* sort, remove duplicates */
rc = set_sorted_merge(set1, set2);
LY_CHECK_RET(rc);
/* final set must be sorted */
assert(!set_sort(set1));
return LY_SUCCESS;
}
/**
* @brief Move context @p set to an attribute in any of the descendants. Handles '//' and '@*',
* '@NAME', '@PREFIX:*', or '@PREFIX:NAME'. Result is LYXP_SET_NODE_SET (or LYXP_SET_EMPTY).
* Context position aware.
*
* @param[in,out] set Set to use.
* @param[in] qname Qualified node name to move to.
* @param[in] qname_len Length of @p qname.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static int
moveto_attr_alldesc(struct lyxp_set *set, const char *qname, uint16_t qname_len)
{
uint32_t i;
int replaced, all = 0;
struct lyd_attr *sub;
const struct lys_module *moveto_mod;
struct lyxp_set *set_all_desc = NULL;
LY_ERR rc;
if (!set || (set->type == LYXP_SET_EMPTY)) {
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INOP_1, "path operator", print_set_type(set));
return LY_EVALID;
}
rc = moveto_resolve_model(&qname, &qname_len, set, &moveto_mod);
LY_CHECK_RET(rc);
/* can be optimized similarly to moveto_node_alldesc() and save considerable amount of memory,
* but it likely won't be used much, so it's a waste of time */
/* copy the context */
set_all_desc = set_copy(set);
/* get all descendant nodes (the original context nodes are removed) */
rc = moveto_node_alldesc(set_all_desc, "*", 1);
if (rc != LY_SUCCESS) {
lyxp_set_free(set_all_desc);
return rc;
}
/* prepend the original context nodes */
rc = moveto_union(set, set_all_desc);
if (rc != LY_SUCCESS) {
lyxp_set_free(set_all_desc);
return rc;
}
lyxp_set_free(set_all_desc);
if ((qname_len == 1) && (qname[0] == '*')) {
all = 1;
}
for (i = 0; i < set->used; ) {
replaced = 0;
/* only attributes of an elem can be in the result, skip all the rest,
* we have all attributes qualified in lyd tree */
if (set->val.nodes[i].type == LYXP_NODE_ELEM) {
for (sub = set->val.nodes[i].node->attr; sub; sub = sub->next) {
/* check "namespace" */
if (moveto_mod && (sub->annotation->module != moveto_mod)) {
continue;
}
if (all || (!strncmp(sub->name, qname, qname_len) && !sub->name[qname_len])) {
/* match */
if (!replaced) {
set->val.attrs[i].attr = sub;
set->val.attrs[i].type = LYXP_NODE_ATTR;
/* pos does not change */
replaced = 1;
} else {
set_insert_node(set, (struct lyd_node *)sub, set->val.attrs[i].pos, LYXP_NODE_ATTR, i + 1);
}
++i;
}
}
}
if (!replaced) {
/* no match */
set_remove_node(set, i);
}
}
return LY_SUCCESS;
}
/**
* @brief Move context @p set to self and al chilren, recursively. Handles '/' or '//' and '.'. Result is LYXP_SET_NODE_SET
* (or LYXP_SET_EMPTY). Context position aware.
*
* @param[in] parent Current parent.
* @param[in] parent_pos Position of @p parent.
* @param[in] parent_type Node type of @p parent.
* @param[in,out] to_set Set to use.
* @param[in] dup_check_set Set for checking duplicities.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
moveto_self_add_children_r(const struct lyd_node *parent, uint32_t parent_pos, enum lyxp_node_type parent_type,
struct lyxp_set *to_set, const struct lyxp_set *dup_check_set, int options)
{
const struct lyd_node *sub;
LY_ERR rc;
switch (parent_type) {
case LYXP_NODE_ROOT:
case LYXP_NODE_ROOT_CONFIG:
/* add the same node but as an element */
if (!set_dup_node_check(dup_check_set, parent, LYXP_NODE_ELEM, -1)) {
set_insert_node(to_set, parent, 0, LYXP_NODE_ELEM, to_set->used);
/* skip anydata/anyxml and dummy nodes */
if (!(parent->schema->nodetype & LYS_ANYDATA)) {
/* also add all the children of this node, recursively */
rc = moveto_self_add_children_r(parent, 0, LYXP_NODE_ELEM, to_set, dup_check_set, options);
LY_CHECK_RET(rc);
}
}
break;
case LYXP_NODE_ELEM:
/* add all the children ... */
if (!(parent->schema->nodetype & (LYS_LEAF | LYS_LEAFLIST | LYS_ANYDATA))) {
for (sub = lyd_node_children(parent); sub; sub = sub->next) {
/* context check */
if ((to_set->root_type == LYXP_NODE_ROOT_CONFIG) && (sub->schema->flags & LYS_CONFIG_R)) {
continue;
}
/* when check */
if (moveto_when_check(sub)) {
return LY_EINCOMPLETE;
}
if (!set_dup_node_check(dup_check_set, sub, LYXP_NODE_ELEM, -1)) {
set_insert_node(to_set, sub, 0, LYXP_NODE_ELEM, to_set->used);
/* skip anydata/anyxml nodes */
if (sub->schema->nodetype & LYS_ANYDATA) {
continue;
}
/* also add all the children of this node, recursively */
rc = moveto_self_add_children_r(sub, 0, LYXP_NODE_ELEM, to_set, dup_check_set, options);
LY_CHECK_RET(rc);
}
}
/* ... or add their text node, ... */
} else {
if (!set_dup_node_check(dup_check_set, parent, LYXP_NODE_TEXT, -1)) {
set_insert_node(to_set, parent, parent_pos, LYXP_NODE_TEXT, to_set->used);
}
}
break;
default:
LOGINT_RET(parent->schema->module->ctx);
}
return LY_SUCCESS;
}
/**
* @brief Move context @p set to self. Handles '/' or '//' and '.'. Result is LYXP_SET_NODE_SET
* (or LYXP_SET_EMPTY). Context position aware.
*
* @param[in,out] set Set to use.
* @param[in] all_desc Whether to go to all descendants ('//') or not ('/').
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
moveto_self(struct lyxp_set *set, int all_desc, int options)
{
uint32_t i;
struct lyxp_set ret_set;
LY_ERR rc;
if (!set || (set->type == LYXP_SET_EMPTY)) {
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INOP_1, "path operator", print_set_type(set));
return LY_EVALID;
}
/* nothing to do */
if (!all_desc) {
return LY_SUCCESS;
}
/* add all the children, they get added recursively */
set_init(&ret_set, set);
for (i = 0; i < set->used; ++i) {
/* copy the current node to tmp */
set_insert_node(&ret_set, set->val.nodes[i].node, set->val.nodes[i].pos, set->val.nodes[i].type, ret_set.used);
/* do not touch attributes and text nodes */
if ((set->val.nodes[i].type == LYXP_NODE_TEXT) || (set->val.nodes[i].type == LYXP_NODE_ATTR)) {
continue;
}
/* skip anydata/anyxml nodes */
if (set->val.nodes[i].node->schema->nodetype & LYS_ANYDATA) {
continue;
}
/* add all the children */
rc = moveto_self_add_children_r(set->val.nodes[i].node, set->val.nodes[i].pos, set->val.nodes[i].type, &ret_set,
set, options);
if (rc != LY_SUCCESS) {
set_free_content(&ret_set);
return rc;
}
}
/* use the temporary set as the current one */
ret_set.ctx_pos = set->ctx_pos;
ret_set.ctx_size = set->ctx_size;
set_free_content(set);
memcpy(set, &ret_set, sizeof *set);
return LY_SUCCESS;
}
/**
* @brief Move context schema @p set to self. Handles '/' or '//' and '.'. Result is LYXP_SET_SCNODE_SET
* (or LYXP_SET_EMPTY).
*
* @param[in,out] set Set to use.
* @param[in] all_desc Whether to go to all descendants ('//') or not ('/').
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
moveto_scnode_self(struct lyxp_set *set, int all_desc, int options)
{
const struct lysc_node *sub;
uint32_t i;
if (!set || (set->type == LYXP_SET_EMPTY)) {
return LY_SUCCESS;
}
if (set->type != LYXP_SET_SCNODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYSC, set->ctx_scnode, LY_VCODE_XP_INOP_1, "path operator", print_set_type(set));
return LY_EVALID;
}
/* nothing to do */
if (!all_desc) {
return LY_SUCCESS;
}
/* add all the children, they get added recursively */
for (i = 0; i < set->used; ++i) {
if (set->val.scnodes[i].in_ctx != 1) {
if (set->val.scnodes[i].in_ctx != -2) {
continue;
}
/* remember context node (it was traversed again so it changes to a normal node) */
set->val.scnodes[i].in_ctx = 1;
}
/* add all the children */
if (set->val.scnodes[i].scnode->nodetype & (LYS_LIST | LYS_CONTAINER)) {
sub = NULL;
while ((sub = lys_getnext(sub, set->val.scnodes[i].scnode, NULL, LYS_GETNEXT_NOSTATECHECK))) {
/* RPC input/output check */
if (options & LYXP_SCNODE_OUTPUT) {
if (sub->parent->nodetype == LYS_INPUT) {
continue;
}
} else {
if (sub->parent->nodetype == LYS_OUTPUT) {
continue;
}
}
/* context check */
if ((set->root_type == LYXP_NODE_ROOT_CONFIG) && (sub->flags & LYS_CONFIG_R)) {
continue;
}
lyxp_set_scnode_insert_node(set, sub, LYXP_NODE_ELEM);
/* throw away the insert index, we want to consider that node again, recursively */
}
}
}
return LY_SUCCESS;
}
/**
* @brief Move context @p set to parent. Handles '/' or '//' and '..'. Result is LYXP_SET_NODE_SET
* (or LYXP_SET_EMPTY). Context position aware.
*
* @param[in] set Set to use.
* @param[in] all_desc Whether to go to all descendants ('//') or not ('/').
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
moveto_parent(struct lyxp_set *set, int all_desc, int options)
{
LY_ERR rc;
uint32_t i;
struct lyd_node *node, *new_node;
enum lyxp_node_type new_type;
if (!set || (set->type == LYXP_SET_EMPTY)) {
return LY_SUCCESS;
}
if (set->type != LYXP_SET_NODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INOP_1, "path operator", print_set_type(set));
return LY_EVALID;
}
if (all_desc) {
/* <path>//.. == <path>//./.. */
rc = moveto_self(set, 1, options);
LY_CHECK_RET(rc);
}
for (i = 0; i < set->used; ++i) {
node = set->val.nodes[i].node;
if (set->val.nodes[i].type == LYXP_NODE_ELEM) {
new_node = (struct lyd_node *)node->parent;
} else if (set->val.nodes[i].type == LYXP_NODE_TEXT) {
new_node = node;
} else if (set->val.nodes[i].type == LYXP_NODE_ATTR) {
new_node = set->val.attrs[i].attr->parent;
if (!new_node) {
LOGINT_RET(set->ctx);
}
} else {
/* root does not have a parent */
set_remove_node_none(set, i);
continue;
}
/* when check */
if (moveto_when_check(new_node)) {
return LY_EINCOMPLETE;
}
/* node already there can also be the root */
if (!new_node) {
new_type = set->root_type;
/* node has a standard parent (it can equal the root, it's not the root yet since they are fake) */
} else {
new_type = LYXP_NODE_ELEM;
}
if (set_dup_node_check(set, new_node, new_type, -1)) {
set_remove_node_none(set, i);
} else {
set_replace_node(set, new_node, 0, new_type, i);
}
}
set_remove_nodes_none(set);
assert(!set_sort(set) && !set_sorted_dup_node_clean(set));
return LY_SUCCESS;
}
/**
* @brief Move context schema @p set to parent. Handles '/' or '//' and '..'. Result is LYXP_SET_SCNODE_SET
* (or LYXP_SET_EMPTY).
*
* @param[in] set Set to use.
* @param[in] all_desc Whether to go to all descendants ('//') or not ('/').
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
moveto_scnode_parent(struct lyxp_set *set, int all_desc, int options)
{
int idx, i, orig_used, temp_ctx = 0;
const struct lysc_node *node, *new_node;
enum lyxp_node_type new_type;
LY_ERR rc;
if (!set || (set->type == LYXP_SET_EMPTY)) {
return LY_SUCCESS;
}
if (set->type != LYXP_SET_SCNODE_SET) {
LOGVAL(set->ctx, LY_VLOG_LYSC, set->ctx_scnode, LY_VCODE_XP_INOP_1, "path operator", print_set_type(set));
return LY_EVALID;
}
if (all_desc) {
/* <path>//.. == <path>//./.. */
rc = moveto_scnode_self(set, 1, options);
LY_CHECK_RET(rc);
}
orig_used = set->used;
for (i = 0; i < orig_used; ++i) {
if (set->val.scnodes[i].in_ctx != 1) {
if (set->val.scnodes[i].in_ctx != -2) {
continue;
}
/* remember context node */
set->val.scnodes[i].in_ctx = -1;
} else {
set->val.scnodes[i].in_ctx = 0;
}
node = set->val.scnodes[i].scnode;
if (set->val.scnodes[i].type == LYXP_NODE_ELEM) {
for (new_node = node->parent;
new_node && (new_node->nodetype & (LYS_CHOICE | LYS_CASE));
new_node = new_node->parent);
} else {
/* root does not have a parent */
continue;
}
/* node has no parent */
if (!new_node) {
new_type = set->root_type;
/* node has a standard parent (it can equal the root, it's not the root yet since they are fake) */
} else {
new_type = LYXP_NODE_ELEM;
}
idx = lyxp_set_scnode_insert_node(set, new_node, new_type);
if ((idx < orig_used) && (idx > i)) {
set->val.scnodes[idx].in_ctx = 2;
temp_ctx = 1;
}
}
if (temp_ctx) {
for (i = 0; i < orig_used; ++i) {
if (set->val.scnodes[i].in_ctx == 2) {
set->val.scnodes[i].in_ctx = 1;
}
}
}
return LY_SUCCESS;
}
/**
* @brief Move context @p set to the result of a comparison. Handles '=', '!=', '<=', '<', '>=', or '>'.
* Result is LYXP_SET_BOOLEAN. Indirectly context position aware.
*
* @param[in,out] set1 Set to use for the result.
* @param[in] set2 Set acting as the second operand for @p op.
* @param[in] op Comparison operator to process.
* @param[in] options XPath options.
* @return LY_ERR
*/
static LY_ERR
moveto_op_comp(struct lyxp_set *set1, struct lyxp_set *set2, const char *op, int options)
{
/*
* NODE SET + NODE SET = NODE SET + STRING /(1 NODE SET) 2 STRING
* NODE SET + STRING = STRING + STRING /1 STRING (2 STRING)
* NODE SET + NUMBER = NUMBER + NUMBER /1 NUMBER (2 NUMBER)
* NODE SET + BOOLEAN = BOOLEAN + BOOLEAN /1 BOOLEAN (2 BOOLEAN)
* STRING + NODE SET = STRING + STRING /(1 STRING) 2 STRING
* NUMBER + NODE SET = NUMBER + NUMBER /(1 NUMBER) 2 NUMBER
* BOOLEAN + NODE SET = BOOLEAN + BOOLEAN /(1 BOOLEAN) 2 BOOLEAN
*
* '=' or '!='
* BOOLEAN + BOOLEAN
* BOOLEAN + STRING = BOOLEAN + BOOLEAN /(1 BOOLEAN) 2 BOOLEAN
* BOOLEAN + NUMBER = BOOLEAN + BOOLEAN /(1 BOOLEAN) 2 BOOLEAN
* STRING + BOOLEAN = BOOLEAN + BOOLEAN /1 BOOLEAN (2 BOOLEAN)
* NUMBER + BOOLEAN = BOOLEAN + BOOLEAN /1 BOOLEAN (2 BOOLEAN)
* NUMBER + NUMBER
* NUMBER + STRING = NUMBER + NUMBER /(1 NUMBER) 2 NUMBER
* STRING + NUMBER = NUMBER + NUMBER /1 NUMBER (2 NUMBER)
* STRING + STRING
*
* '<=', '<', '>=', '>'
* NUMBER + NUMBER
* BOOLEAN + BOOLEAN = NUMBER + NUMBER /1 NUMBER, 2 NUMBER
* BOOLEAN + NUMBER = NUMBER + NUMBER /1 NUMBER (2 NUMBER)
* BOOLEAN + STRING = NUMBER + NUMBER /1 NUMBER, 2 NUMBER
* NUMBER + STRING = NUMBER + NUMBER /(1 NUMBER) 2 NUMBER
* STRING + STRING = NUMBER + NUMBER /1 NUMBER, 2 NUMBER
* STRING + NUMBER = NUMBER + NUMBER /1 NUMBER (2 NUMBER)
* NUMBER + BOOLEAN = NUMBER + NUMBER /(1 NUMBER) 2 NUMBER
* STRING + BOOLEAN = NUMBER + NUMBER /(1 NUMBER) 2 NUMBER
*/
struct lyxp_set iter1, iter2;
int result;
int64_t i;
LY_ERR rc;
iter1.type = LYXP_SET_EMPTY;
/* empty node-sets are always false */
if ((set1->type == LYXP_SET_EMPTY) || (set2->type == LYXP_SET_EMPTY)) {
set_fill_boolean(set1, 0);
return LY_SUCCESS;
}
/* iterative evaluation with node-sets */
if ((set1->type == LYXP_SET_NODE_SET) || (set2->type == LYXP_SET_NODE_SET)) {
if (set1->type == LYXP_SET_NODE_SET) {
for (i = 0; i < set1->used; ++i) {
switch (set2->type) {
case LYXP_SET_NUMBER:
rc = set_comp_cast(&iter1, set1, LYXP_SET_NUMBER, i);
break;
case LYXP_SET_BOOLEAN:
rc = set_comp_cast(&iter1, set1, LYXP_SET_BOOLEAN, i);
break;
default:
rc = set_comp_cast(&iter1, set1, LYXP_SET_STRING, i);
break;
}
LY_CHECK_RET(rc);
rc = moveto_op_comp(&iter1, set2, op, options);
if (rc != LY_SUCCESS) {
set_free_content(&iter1);
return rc;
}
/* lazy evaluation until true */
if (iter1.val.bool) {
set_fill_boolean(set1, 1);
return LY_SUCCESS;
}
}
} else {
for (i = 0; i < set2->used; ++i) {
switch (set1->type) {
case LYXP_SET_NUMBER:
rc = set_comp_cast(&iter2, set2, LYXP_SET_NUMBER, i);
break;
case LYXP_SET_BOOLEAN:
rc = set_comp_cast(&iter2, set2, LYXP_SET_BOOLEAN, i);
break;
default:
rc = set_comp_cast(&iter2, set2, LYXP_SET_STRING, i);
break;
}
LY_CHECK_RET(rc);
set_fill_set(&iter1, set1);
rc = moveto_op_comp(&iter1, &iter2, op, options);
if (rc != LY_SUCCESS) {
set_free_content(&iter1);
set_free_content(&iter2);
return rc;
}
set_free_content(&iter2);
/* lazy evaluation until true */
if (iter1.val.bool) {
set_fill_boolean(set1, 1);
return LY_SUCCESS;
}
}
}
/* false for all nodes */
set_fill_boolean(set1, 0);
return LY_SUCCESS;
}
/* first convert properly */
if ((op[0] == '=') || (op[0] == '!')) {
if ((set1->type == LYXP_SET_BOOLEAN) || (set2->type == LYXP_SET_BOOLEAN)) {
lyxp_set_cast(set1, LYXP_SET_BOOLEAN);
lyxp_set_cast(set2, LYXP_SET_BOOLEAN);
} else if ((set1->type == LYXP_SET_NUMBER) || (set2->type == LYXP_SET_NUMBER)) {
rc = lyxp_set_cast(set1, LYXP_SET_NUMBER);
LY_CHECK_RET(rc);
rc = lyxp_set_cast(set2, LYXP_SET_NUMBER);
LY_CHECK_RET(rc);
} /* else we have 2 strings */
} else {
rc = lyxp_set_cast(set1, LYXP_SET_NUMBER);
LY_CHECK_RET(rc);
rc = lyxp_set_cast(set2, LYXP_SET_NUMBER);
LY_CHECK_RET(rc);
}
assert(set1->type == set2->type);
/* compute result */
if (op[0] == '=') {
if (set1->type == LYXP_SET_BOOLEAN) {
result = (set1->val.bool == set2->val.bool);
} else if (set1->type == LYXP_SET_NUMBER) {
result = (set1->val.num == set2->val.num);
} else {
assert(set1->type == LYXP_SET_STRING);
result = !strcmp(set1->val.str, set2->val.str);
}
} else if (op[0] == '!') {
if (set1->type == LYXP_SET_BOOLEAN) {
result = (set1->val.bool != set2->val.bool);
} else if (set1->type == LYXP_SET_NUMBER) {
result = (set1->val.num != set2->val.num);
} else {
assert(set1->type == LYXP_SET_STRING);
result = !strcmp(set1->val.str, set2->val.str);
}
} else {
assert(set1->type == LYXP_SET_NUMBER);
if (op[0] == '<') {
if (op[1] == '=') {
result = (set1->val.num <= set2->val.num);
} else {
result = (set1->val.num < set2->val.num);
}
} else {
if (op[1] == '=') {
result = (set1->val.num >= set2->val.num);
} else {
result = (set1->val.num > set2->val.num);
}
}
}
/* assign result */
if (result) {
set_fill_boolean(set1, 1);
} else {
set_fill_boolean(set1, 0);
}
return LY_SUCCESS;
}
/**
* @brief Move context @p set to the result of a basic operation. Handles '+', '-', unary '-', '*', 'div',
* or 'mod'. Result is LYXP_SET_NUMBER. Indirectly context position aware.
*
* @param[in,out] set1 Set to use for the result.
* @param[in] set2 Set acting as the second operand for @p op.
* @param[in] op Operator to process.
* @return LY_ERR
*/
static LY_ERR
moveto_op_math(struct lyxp_set *set1, struct lyxp_set *set2, const char *op)
{
LY_ERR rc;
/* unary '-' */
if (!set2 && (op[0] == '-')) {
rc = lyxp_set_cast(set1, LYXP_SET_NUMBER);
LY_CHECK_RET(rc);
set1->val.num *= -1;
lyxp_set_free(set2);
return LY_SUCCESS;
}
assert(set1 && set2);
rc = lyxp_set_cast(set1, LYXP_SET_NUMBER);
LY_CHECK_RET(rc);
rc = lyxp_set_cast(set2, LYXP_SET_NUMBER);
LY_CHECK_RET(rc);
switch (op[0]) {
/* '+' */
case '+':
set1->val.num += set2->val.num;
break;
/* '-' */
case '-':
set1->val.num -= set2->val.num;
break;
/* '*' */
case '*':
set1->val.num *= set2->val.num;
break;
/* 'div' */
case 'd':
set1->val.num /= set2->val.num;
break;
/* 'mod' */
case 'm':
set1->val.num = ((long long)set1->val.num) % ((long long)set2->val.num);
break;
default:
LOGINT_RET(set1->ctx);
}
return LY_SUCCESS;
}
/*
* eval functions
*
* They execute a parsed XPath expression on some data subtree.
*/
/**
* @brief Evaluate Literal. Logs directly on error.
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
*/
static void
eval_literal(struct lyxp_expr *exp, uint16_t *exp_idx, struct lyxp_set *set)
{
if (set) {
if (exp->tok_len[*exp_idx] == 2) {
set_fill_string(set, "", 0);
} else {
set_fill_string(set, &exp->expr[exp->tok_pos[*exp_idx] + 1], exp->tok_len[*exp_idx] - 2);
}
}
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
}
/**
* @brief Evaluate NodeTest. Logs directly on error.
*
* [6] NodeTest ::= NameTest | NodeType '(' ')'
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in] attr_axis Whether to search attributes or standard nodes.
* @param[in] all_desc Whether to search all the descendants or children only.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static int
eval_node_test(struct lyxp_expr *exp, uint16_t *exp_idx, int attr_axis, int all_desc,
struct lyxp_set *set, int options)
{
int i;
char *path;
LY_ERR rc;
switch (exp->tokens[*exp_idx]) {
case LYXP_TOKEN_NAMETEST:
if (attr_axis) {
if (set && (options & LYXP_SCNODE_ALL)) {
set_scnode_clear_ctx(set);
rc = LY_SUCCESS;
} else {
if (all_desc) {
rc = moveto_attr_alldesc(set, &exp->expr[exp->tok_pos[*exp_idx]], exp->tok_len[*exp_idx]);
} else {
rc = moveto_attr(set, &exp->expr[exp->tok_pos[*exp_idx]], exp->tok_len[*exp_idx]);
}
}
} else {
if (all_desc) {
if (set && (options & LYXP_SCNODE_ALL)) {
rc = moveto_scnode_alldesc(set, &exp->expr[exp->tok_pos[*exp_idx]], exp->tok_len[*exp_idx], options);
} else {
rc = moveto_node_alldesc(set, &exp->expr[exp->tok_pos[*exp_idx]], exp->tok_len[*exp_idx]);
}
} else {
if (set && (options & LYXP_SCNODE_ALL)) {
rc = moveto_scnode(set, &exp->expr[exp->tok_pos[*exp_idx]], exp->tok_len[*exp_idx], options);
} else {
rc = moveto_node(set, &exp->expr[exp->tok_pos[*exp_idx]], exp->tok_len[*exp_idx]);
}
}
if ((rc == LY_SUCCESS) && set && (options & LYXP_SCNODE_ALL)) {
for (i = set->used - 1; i > -1; --i) {
if (set->val.scnodes[i].in_ctx > 0) {
break;
}
}
if (i == -1) {
path = lysc_path(set->ctx_scnode, LYSC_PATH_LOG, NULL, 0);
LOGWRN(set->ctx, "Schema node \"%.*s\" not found (%.*s) with context node \"%s\".",
exp->tok_len[*exp_idx], &exp->expr[exp->tok_pos[*exp_idx]],
exp->tok_pos[*exp_idx] + exp->tok_len[*exp_idx], exp->expr, path);
free(path);
}
}
}
LY_CHECK_RET(rc);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
break;
case LYXP_TOKEN_NODETYPE:
if (set) {
assert(exp->tok_len[*exp_idx] == 4);
if (set->type == LYXP_SET_SCNODE_SET) {
set_scnode_clear_ctx(set);
/* just for the debug message underneath */
set = NULL;
} else {
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "node", 4)) {
rc = xpath_node(NULL, 0, set, options);
LY_CHECK_RET(rc);
} else {
assert(!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "text", 4));
rc = xpath_text(NULL, 0, set, options);
LY_CHECK_RET(rc);
}
}
}
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
/* '(' */
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_PAR1);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
/* ')' */
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_PAR2);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
break;
default:
LOGINT_RET(set ? set->ctx : NULL);
}
return LY_SUCCESS;
}
/**
* @brief Evaluate Predicate. Logs directly on error.
*
* [7] Predicate ::= '[' Expr ']'
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @param[in] parent_pos_pred Whether parent predicate was a positional one.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_predicate(struct lyxp_expr *exp, uint16_t *exp_idx, struct lyxp_set *set, int options, int parent_pos_pred)
{
LY_ERR rc;
uint16_t i, orig_exp;
uint32_t orig_pos, orig_size;
int32_t pred_in_ctx;
struct lyxp_set set2;
struct lyd_node *orig_parent;
/* '[' */
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
if (!set) {
only_parse:
rc = eval_expr_select(exp, exp_idx, 0, NULL, options);
LY_CHECK_RET(rc);
} else if (set->type == LYXP_SET_NODE_SET) {
/* we (possibly) need the set sorted, it can affect the result (if the predicate result is a number) */
assert(!set_sort(set));
/* empty set, nothing to evaluate */
if (!set->used) {
goto only_parse;
}
orig_exp = *exp_idx;
orig_pos = 0;
orig_size = set->used;
orig_parent = NULL;
for (i = 0; i < set->used; ) {
set_init(&set2, set);
set_insert_node(&set2, set->val.nodes[i].node, set->val.nodes[i].pos, set->val.nodes[i].type, 0);
/* remember the node context position for position() and context size for last(),
* predicates should always be evaluated with respect to the child axis (since we do
* not support explicit axes) so we assign positions based on their parents */
if (parent_pos_pred && ((struct lyd_node *)set->val.nodes[i].node->parent != orig_parent)) {
orig_parent = (struct lyd_node *)set->val.nodes[i].node->parent;
orig_pos = 1;
} else {
++orig_pos;
}
set2.ctx_pos = orig_pos;
set2.ctx_size = orig_size;
*exp_idx = orig_exp;
rc = eval_expr_select(exp, exp_idx, 0, &set2, options);
if (rc != LY_SUCCESS) {
lyxp_set_cast(&set2, LYXP_SET_EMPTY);
return rc;
}
/* number is a position */
if (set2.type == LYXP_SET_NUMBER) {
if ((long long)set2.val.num == orig_pos) {
set2.val.num = 1;
} else {
set2.val.num = 0;
}
}
lyxp_set_cast(&set2, LYXP_SET_BOOLEAN);
/* predicate satisfied or not? */
if (!set2.val.bool) {
set_remove_node_none(set, i);
}
}
set_remove_nodes_none(set);
} else if (set->type == LYXP_SET_SCNODE_SET) {
for (i = 0; i < set->used; ++i) {
if (set->val.scnodes[i].in_ctx == 1) {
/* there is a currently-valid node */
break;
}
}
/* empty set, nothing to evaluate */
if (i == set->used) {
goto only_parse;
}
orig_exp = *exp_idx;
/* set special in_ctx to all the valid snodes */
pred_in_ctx = set_scnode_new_in_ctx(set);
/* use the valid snodes one-by-one */
for (i = 0; i < set->used; ++i) {
if (set->val.scnodes[i].in_ctx != pred_in_ctx) {
continue;
}
set->val.scnodes[i].in_ctx = 1;
*exp_idx = orig_exp;
rc = eval_expr_select(exp, exp_idx, 0, set, options);
LY_CHECK_RET(rc);
set->val.scnodes[i].in_ctx = pred_in_ctx;
}
/* restore the state as it was before the predicate */
for (i = 0; i < set->used; ++i) {
if (set->val.scnodes[i].in_ctx == 1) {
set->val.scnodes[i].in_ctx = 0;
} else if (set->val.scnodes[i].in_ctx == pred_in_ctx) {
set->val.scnodes[i].in_ctx = 1;
}
}
} else {
set2.type = LYXP_SET_EMPTY;
set_fill_set(&set2, set);
rc = eval_expr_select(exp, exp_idx, 0, &set2, options);
if (rc != LY_SUCCESS) {
lyxp_set_cast(&set2, LYXP_SET_EMPTY);
return rc;
}
lyxp_set_cast(&set2, LYXP_SET_BOOLEAN);
if (!set2.val.bool) {
lyxp_set_cast(set, LYXP_SET_EMPTY);
}
lyxp_set_cast(&set2, LYXP_SET_EMPTY);
}
/* ']' */
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_BRACK2);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
return LY_SUCCESS;
}
/**
* @brief Evaluate RelativeLocationPath. Logs directly on error.
*
* [4] RelativeLocationPath ::= Step | RelativeLocationPath '/' Step | RelativeLocationPath '//' Step
* [5] Step ::= '@'? NodeTest Predicate* | '.' | '..'
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in] all_desc Whether to search all the descendants or children only.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (YL_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_relative_location_path(struct lyxp_expr *exp, uint16_t *exp_idx, int all_desc, struct lyxp_set *set, int options)
{
int attr_axis;
LY_ERR rc;
goto step;
do {
/* evaluate '/' or '//' */
if (exp->tok_len[*exp_idx] == 1) {
all_desc = 0;
} else {
assert(exp->tok_len[*exp_idx] == 2);
all_desc = 1;
}
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
step:
/* Step */
attr_axis = 0;
switch (exp->tokens[*exp_idx]) {
case LYXP_TOKEN_DOT:
/* evaluate '.' */
if (set && (options & LYXP_SCNODE_ALL)) {
rc = moveto_scnode_self(set, all_desc, options);
} else {
rc = moveto_self(set, all_desc, options);
}
LY_CHECK_RET(rc);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
break;
case LYXP_TOKEN_DDOT:
/* evaluate '..' */
if (set && (options & LYXP_SCNODE_ALL)) {
rc = moveto_scnode_parent(set, all_desc, options);
} else {
rc = moveto_parent(set, all_desc, options);
}
LY_CHECK_RET(rc);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
break;
case LYXP_TOKEN_AT:
/* evaluate '@' */
attr_axis = 1;
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
/* fall through */
case LYXP_TOKEN_NAMETEST:
case LYXP_TOKEN_NODETYPE:
rc = eval_node_test(exp, exp_idx, attr_axis, all_desc, set, options);
LY_CHECK_RET(rc);
while ((exp->used > *exp_idx) && (exp->tokens[*exp_idx] == LYXP_TOKEN_BRACK1)) {
rc = eval_predicate(exp, exp_idx, set, options, 1);
LY_CHECK_RET(rc);
}
break;
default:
LOGINT_RET(set ? set->ctx : NULL);
}
} while ((exp->used > *exp_idx) && (exp->tokens[*exp_idx] == LYXP_TOKEN_OPERATOR_PATH));
return LY_SUCCESS;
}
/**
* @brief Evaluate AbsoluteLocationPath. Logs directly on error.
*
* [3] AbsoluteLocationPath ::= '/' RelativeLocationPath? | '//' RelativeLocationPath
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_absolute_location_path(struct lyxp_expr *exp, uint16_t *exp_idx, struct lyxp_set *set, int options)
{
int all_desc;
LY_ERR rc;
if (set) {
/* no matter what tokens follow, we need to be at the root */
moveto_root(set, options);
}
/* '/' RelativeLocationPath? */
if (exp->tok_len[*exp_idx] == 1) {
/* evaluate '/' - deferred */
all_desc = 0;
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
if (exp_check_token(set ? set->ctx : NULL, exp, *exp_idx, LYXP_TOKEN_NONE, 0)) {
return LY_SUCCESS;
}
switch (exp->tokens[*exp_idx]) {
case LYXP_TOKEN_DOT:
case LYXP_TOKEN_DDOT:
case LYXP_TOKEN_AT:
case LYXP_TOKEN_NAMETEST:
case LYXP_TOKEN_NODETYPE:
rc = eval_relative_location_path(exp, exp_idx, all_desc, set, options);
LY_CHECK_RET(rc);
break;
default:
break;
}
/* '//' RelativeLocationPath */
} else {
/* evaluate '//' - deferred so as not to waste memory by remembering all the nodes */
all_desc = 1;
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
rc = eval_relative_location_path(exp, exp_idx, all_desc, set, options);
LY_CHECK_RET(rc);
}
return LY_SUCCESS;
}
/**
* @brief Evaluate FunctionCall. Logs directly on error.
*
* [9] FunctionCall ::= FunctionName '(' ( Expr ( ',' Expr )* )? ')'
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_function_call(struct lyxp_expr *exp, uint16_t *exp_idx, struct lyxp_set *set, int options)
{
LY_ERR rc;
LY_ERR (*xpath_func)(struct lyxp_set **, uint16_t, struct lyxp_set *, int) = NULL;
uint16_t arg_count = 0, i;
struct lyxp_set **args = NULL, **args_aux;
if (set) {
/* FunctionName */
switch (exp->tok_len[*exp_idx]) {
case 3:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "not", 3)) {
xpath_func = &xpath_not;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "sum", 3)) {
xpath_func = &xpath_sum;
}
break;
case 4:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "lang", 4)) {
xpath_func = &xpath_lang;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "last", 4)) {
xpath_func = &xpath_last;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "name", 4)) {
xpath_func = &xpath_name;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "true", 4)) {
xpath_func = &xpath_true;
}
break;
case 5:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "count", 5)) {
xpath_func = &xpath_count;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "false", 5)) {
xpath_func = &xpath_false;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "floor", 5)) {
xpath_func = &xpath_floor;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "round", 5)) {
xpath_func = &xpath_round;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "deref", 5)) {
xpath_func = &xpath_deref;
}
break;
case 6:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "concat", 6)) {
xpath_func = &xpath_concat;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "number", 6)) {
xpath_func = &xpath_number;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "string", 6)) {
xpath_func = &xpath_string;
}
break;
case 7:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "boolean", 7)) {
xpath_func = &xpath_boolean;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "ceiling", 7)) {
xpath_func = &xpath_ceiling;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "current", 7)) {
xpath_func = &xpath_current;
}
break;
case 8:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "contains", 8)) {
xpath_func = &xpath_contains;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "position", 8)) {
xpath_func = &xpath_position;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "re-match", 8)) {
xpath_func = &xpath_re_match;
}
break;
case 9:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "substring", 9)) {
xpath_func = &xpath_substring;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "translate", 9)) {
xpath_func = &xpath_translate;
}
break;
case 10:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "local-name", 10)) {
xpath_func = &xpath_local_name;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "enum-value", 10)) {
xpath_func = &xpath_enum_value;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "bit-is-set", 10)) {
xpath_func = &xpath_bit_is_set;
}
break;
case 11:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "starts-with", 11)) {
xpath_func = &xpath_starts_with;
}
break;
case 12:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "derived-from", 12)) {
xpath_func = &xpath_derived_from;
}
break;
case 13:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "namespace-uri", 13)) {
xpath_func = &xpath_namespace_uri;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "string-length", 13)) {
xpath_func = &xpath_string_length;
}
break;
case 15:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "normalize-space", 15)) {
xpath_func = &xpath_normalize_space;
} else if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "substring-after", 15)) {
xpath_func = &xpath_substring_after;
}
break;
case 16:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "substring-before", 16)) {
xpath_func = &xpath_substring_before;
}
break;
case 20:
if (!strncmp(&exp->expr[exp->tok_pos[*exp_idx]], "derived-from-or-self", 20)) {
xpath_func = &xpath_derived_from_or_self;
}
break;
}
if (!xpath_func) {
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INTOK, "Unknown", &exp->expr[exp->tok_pos[*exp_idx]]);
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INFUNC, exp->tok_len[*exp_idx], &exp->expr[exp->tok_pos[*exp_idx]]);
return LY_EVALID;
}
}
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
/* '(' */
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_PAR1);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
/* ( Expr ( ',' Expr )* )? */
if (exp->tokens[*exp_idx] != LYXP_TOKEN_PAR2) {
if (set) {
args = malloc(sizeof *args);
LY_CHECK_ERR_GOTO(!args, LOGMEM(set->ctx); rc = LY_EMEM, cleanup);
arg_count = 1;
args[0] = set_copy(set);
if (!args[0]) {
rc = LY_EMEM;
goto cleanup;
}
rc = eval_expr_select(exp, exp_idx, 0, args[0], options);
LY_CHECK_GOTO(rc, cleanup);
} else {
rc = eval_expr_select(exp, exp_idx, 0, NULL, options);
LY_CHECK_GOTO(rc, cleanup);
}
}
while ((exp->used > *exp_idx) && (exp->tokens[*exp_idx] == LYXP_TOKEN_COMMA)) {
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
if (set) {
++arg_count;
args_aux = realloc(args, arg_count * sizeof *args);
LY_CHECK_ERR_GOTO(!args_aux, arg_count--; LOGMEM(set->ctx); rc = LY_EMEM, cleanup);
args = args_aux;
args[arg_count - 1] = set_copy(set);
if (!args[arg_count - 1]) {
rc = LY_EMEM;
goto cleanup;
}
rc = eval_expr_select(exp, exp_idx, 0, args[arg_count - 1], options);
LY_CHECK_GOTO(rc, cleanup);
} else {
rc = eval_expr_select(exp, exp_idx, 0, NULL, options);
LY_CHECK_GOTO(rc, cleanup);
}
}
/* ')' */
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_PAR2);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
if (set) {
/* evaluate function */
rc = xpath_func(args, arg_count, set, options);
if (options & LYXP_SCNODE_ALL) {
/* merge all nodes from arg evaluations */
for (i = 0; i < arg_count; ++i) {
set_scnode_clear_ctx(args[i]);
lyxp_set_scnode_merge(set, args[i]);
}
}
} else {
rc = LY_SUCCESS;
}
cleanup:
for (i = 0; i < arg_count; ++i) {
lyxp_set_free(args[i]);
}
free(args);
return rc;
}
/**
* @brief Evaluate Number. Logs directly on error.
*
* @param[in] ctx Context for errors.
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @return LY_ERR
*/
static LY_ERR
eval_number(struct ly_ctx *ctx, struct lyxp_expr *exp, uint16_t *exp_idx, struct lyxp_set *set)
{
long double num;
char *endptr;
if (set) {
errno = 0;
num = strtold(&exp->expr[exp->tok_pos[*exp_idx]], &endptr);
if (errno) {
LOGVAL(ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INTOK, "Unknown", &exp->expr[exp->tok_pos[*exp_idx]]);
LOGVAL(ctx, LY_VLOG_LYD, set->ctx_node, LYVE_XPATH, "Failed to convert \"%.*s\" into a long double (%s).",
exp->tok_len[*exp_idx], &exp->expr[exp->tok_pos[*exp_idx]], strerror(errno));
return LY_EVALID;
} else if (endptr - &exp->expr[exp->tok_pos[*exp_idx]] != exp->tok_len[*exp_idx]) {
LOGVAL(ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INTOK, "Unknown", &exp->expr[exp->tok_pos[*exp_idx]]);
LOGVAL(ctx, LY_VLOG_LYD, set->ctx_node, LYVE_XPATH, "Failed to convert \"%.*s\" into a long double.",
exp->tok_len[*exp_idx], &exp->expr[exp->tok_pos[*exp_idx]]);
return LY_EVALID;
}
set_fill_number(set, num);
}
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
return LY_SUCCESS;
}
/**
* @brief Evaluate PathExpr. Logs directly on error.
*
* [10] PathExpr ::= LocationPath | PrimaryExpr Predicate*
* | PrimaryExpr Predicate* '/' RelativeLocationPath
* | PrimaryExpr Predicate* '//' RelativeLocationPath
* [2] LocationPath ::= RelativeLocationPath | AbsoluteLocationPath
* [8] PrimaryExpr ::= '(' Expr ')' | Literal | Number | FunctionCall
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_path_expr(struct lyxp_expr *exp, uint16_t *exp_idx, struct lyxp_set *set, int options)
{
int all_desc, parent_pos_pred;
LY_ERR rc;
switch (exp->tokens[*exp_idx]) {
case LYXP_TOKEN_PAR1:
/* '(' Expr ')' */
/* '(' */
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
/* Expr */
rc = eval_expr_select(exp, exp_idx, 0, set, options);
LY_CHECK_RET(rc);
/* ')' */
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_PAR2);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
parent_pos_pred = 0;
goto predicate;
case LYXP_TOKEN_DOT:
case LYXP_TOKEN_DDOT:
case LYXP_TOKEN_AT:
case LYXP_TOKEN_NAMETEST:
case LYXP_TOKEN_NODETYPE:
/* RelativeLocationPath */
rc = eval_relative_location_path(exp, exp_idx, 0, set, options);
LY_CHECK_RET(rc);
break;
case LYXP_TOKEN_FUNCNAME:
/* FunctionCall */
if (!set) {
rc = eval_function_call(exp, exp_idx, NULL, options);
} else {
rc = eval_function_call(exp, exp_idx, set, options);
}
LY_CHECK_RET(rc);
parent_pos_pred = 1;
goto predicate;
case LYXP_TOKEN_OPERATOR_PATH:
/* AbsoluteLocationPath */
rc = eval_absolute_location_path(exp, exp_idx, set, options);
LY_CHECK_RET(rc);
break;
case LYXP_TOKEN_LITERAL:
/* Literal */
if (!set || (options & LYXP_SCNODE_ALL)) {
if (set) {
set_scnode_clear_ctx(set);
}
eval_literal(exp, exp_idx, NULL);
} else {
eval_literal(exp, exp_idx, set);
}
parent_pos_pred = 1;
goto predicate;
case LYXP_TOKEN_NUMBER:
/* Number */
if (!set || (options & LYXP_SCNODE_ALL)) {
if (set) {
set_scnode_clear_ctx(set);
}
rc = eval_number(NULL, exp, exp_idx, NULL);
} else {
rc = eval_number(set->ctx, exp, exp_idx, set);
}
LY_CHECK_RET(rc);
parent_pos_pred = 1;
goto predicate;
default:
LOGVAL(set->ctx, LY_VLOG_LYD, set->ctx_node, LY_VCODE_XP_INTOK, print_token(exp->tokens[*exp_idx]),
&exp->expr[exp->tok_pos[*exp_idx]]);
return LY_EVALID;
}
return LY_SUCCESS;
predicate:
/* Predicate* */
while ((exp->used > *exp_idx) && (exp->tokens[*exp_idx] == LYXP_TOKEN_BRACK1)) {
rc = eval_predicate(exp, exp_idx, set, options, parent_pos_pred);
LY_CHECK_RET(rc);
}
/* ('/' or '//') RelativeLocationPath */
if ((exp->used > *exp_idx) && (exp->tokens[*exp_idx] == LYXP_TOKEN_OPERATOR_PATH)) {
/* evaluate '/' or '//' */
if (exp->tok_len[*exp_idx] == 1) {
all_desc = 0;
} else {
assert(exp->tok_len[*exp_idx] == 2);
all_desc = 1;
}
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
rc = eval_relative_location_path(exp, exp_idx, all_desc, set, options);
LY_CHECK_RET(rc);
}
return LY_SUCCESS;
}
/**
* @brief Evaluate UnionExpr. Logs directly on error.
*
* [18] UnionExpr ::= PathExpr | UnionExpr '|' PathExpr
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in] repeat How many times this expression is repeated.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_union_expr(struct lyxp_expr *exp, uint16_t *exp_idx, uint16_t repeat, struct lyxp_set *set, int options)
{
LY_ERR rc = LY_SUCCESS;
struct lyxp_set orig_set, set2;
uint16_t i;
assert(repeat);
set_init(&orig_set, set);
set_init(&set2, set);
set_fill_set(&orig_set, set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_UNION, set, options);
LY_CHECK_GOTO(rc, cleanup);
/* ('|' PathExpr)* */
for (i = 0; i < repeat; ++i) {
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_OPERATOR_UNI);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
if (!set) {
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_UNION, NULL, options);
LY_CHECK_GOTO(rc, cleanup);
continue;
}
set_fill_set(&set2, &orig_set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_UNION, &set2, options);
LY_CHECK_GOTO(rc, cleanup);
/* eval */
if (options & LYXP_SCNODE_ALL) {
lyxp_set_scnode_merge(set, &set2);
} else {
rc = moveto_union(set, &set2);
LY_CHECK_GOTO(rc, cleanup);
}
}
cleanup:
lyxp_set_cast(&orig_set, LYXP_SET_EMPTY);
lyxp_set_cast(&set2, LYXP_SET_EMPTY);
return rc;
}
/**
* @brief Evaluate UnaryExpr. Logs directly on error.
*
* [17] UnaryExpr ::= UnionExpr | '-' UnaryExpr
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in] repeat How many times this expression is repeated.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_unary_expr(struct lyxp_expr *exp, uint16_t *exp_idx, uint16_t repeat, struct lyxp_set *set, int options)
{
LY_ERR rc;
uint16_t this_op, i;
assert(repeat);
/* ('-')+ */
this_op = *exp_idx;
for (i = 0; i < repeat; ++i) {
assert(!exp_check_token(set->ctx, exp, *exp_idx, LYXP_TOKEN_OPERATOR_MATH, 0) && (exp->expr[exp->tok_pos[*exp_idx]] == '-'));
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
}
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_UNARY, set, options);
LY_CHECK_RET(rc);
if (set && (repeat % 2)) {
if (options & LYXP_SCNODE_ALL) {
warn_operands(set->ctx, set, NULL, 1, exp->expr, exp->tok_pos[this_op]);
} else {
rc = moveto_op_math(set, NULL, &exp->expr[exp->tok_pos[this_op]]);
LY_CHECK_RET(rc);
}
}
return LY_SUCCESS;
}
/**
* @brief Evaluate MultiplicativeExpr. Logs directly on error.
*
* [16] MultiplicativeExpr ::= UnaryExpr
* | MultiplicativeExpr '*' UnaryExpr
* | MultiplicativeExpr 'div' UnaryExpr
* | MultiplicativeExpr 'mod' UnaryExpr
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in] repeat How many times this expression is repeated.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_multiplicative_expr(struct lyxp_expr *exp, uint16_t *exp_idx, uint16_t repeat, struct lyxp_set *set, int options)
{
LY_ERR rc;
uint16_t this_op;
struct lyxp_set orig_set, set2;
uint16_t i;
assert(repeat);
set_init(&orig_set, set);
set_init(&set2, set);
set_fill_set(&orig_set, set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_MULTIPLICATIVE, set, options);
LY_CHECK_GOTO(rc, cleanup);
/* ('*' / 'div' / 'mod' UnaryExpr)* */
for (i = 0; i < repeat; ++i) {
this_op = *exp_idx;
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_OPERATOR_MATH);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
if (!set) {
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_MULTIPLICATIVE, NULL, options);
LY_CHECK_GOTO(rc, cleanup);
continue;
}
set_fill_set(&set2, &orig_set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_MULTIPLICATIVE, &set2, options);
LY_CHECK_GOTO(rc, cleanup);
/* eval */
if (options & LYXP_SCNODE_ALL) {
warn_operands(set->ctx, set, &set2, 1, exp->expr, exp->tok_pos[this_op - 1]);
lyxp_set_scnode_merge(set, &set2);
set_scnode_clear_ctx(set);
} else {
rc = moveto_op_math(set, &set2, &exp->expr[exp->tok_pos[this_op]]);
LY_CHECK_GOTO(rc, cleanup);
}
}
cleanup:
lyxp_set_cast(&orig_set, LYXP_SET_EMPTY);
lyxp_set_cast(&set2, LYXP_SET_EMPTY);
return rc;
}
/**
* @brief Evaluate AdditiveExpr. Logs directly on error.
*
* [15] AdditiveExpr ::= MultiplicativeExpr
* | AdditiveExpr '+' MultiplicativeExpr
* | AdditiveExpr '-' MultiplicativeExpr
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in] repeat How many times this expression is repeated.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_additive_expr(struct lyxp_expr *exp, uint16_t *exp_idx, uint16_t repeat, struct lyxp_set *set, int options)
{
LY_ERR rc;
uint16_t this_op;
struct lyxp_set orig_set, set2;
uint16_t i;
assert(repeat);
set_init(&orig_set, set);
set_init(&set2, set);
set_fill_set(&orig_set, set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_ADDITIVE, set, options);
LY_CHECK_GOTO(rc, cleanup);
/* ('+' / '-' MultiplicativeExpr)* */
for (i = 0; i < repeat; ++i) {
this_op = *exp_idx;
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_OPERATOR_MATH);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
if (!set) {
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_ADDITIVE, NULL, options);
LY_CHECK_GOTO(rc, cleanup);
continue;
}
set_fill_set(&set2, &orig_set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_ADDITIVE, &set2, options);
LY_CHECK_GOTO(rc, cleanup);
/* eval */
if (options & LYXP_SCNODE_ALL) {
warn_operands(set->ctx, set, &set2, 1, exp->expr, exp->tok_pos[this_op - 1]);
lyxp_set_scnode_merge(set, &set2);
set_scnode_clear_ctx(set);
} else {
rc = moveto_op_math(set, &set2, &exp->expr[exp->tok_pos[this_op]]);
LY_CHECK_GOTO(rc, cleanup);
}
}
cleanup:
lyxp_set_cast(&orig_set, LYXP_SET_EMPTY);
lyxp_set_cast(&set2, LYXP_SET_EMPTY);
return rc;
}
/**
* @brief Evaluate RelationalExpr. Logs directly on error.
*
* [14] RelationalExpr ::= AdditiveExpr
* | RelationalExpr '<' AdditiveExpr
* | RelationalExpr '>' AdditiveExpr
* | RelationalExpr '<=' AdditiveExpr
* | RelationalExpr '>=' AdditiveExpr
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in] repeat How many times this expression is repeated.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_relational_expr(struct lyxp_expr *exp, uint16_t *exp_idx, uint16_t repeat, struct lyxp_set *set, int options)
{
LY_ERR rc;
uint16_t this_op;
struct lyxp_set orig_set, set2;
uint16_t i;
assert(repeat);
set_init(&orig_set, set);
set_init(&set2, set);
set_fill_set(&orig_set, set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_RELATIONAL, set, options);
LY_CHECK_GOTO(rc, cleanup);
/* ('<' / '>' / '<=' / '>=' AdditiveExpr)* */
for (i = 0; i < repeat; ++i) {
this_op = *exp_idx;
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_OPERATOR_COMP);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
if (!set) {
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_RELATIONAL, NULL, options);
LY_CHECK_GOTO(rc, cleanup);
continue;
}
set_fill_set(&set2, &orig_set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_RELATIONAL, &set2, options);
LY_CHECK_GOTO(rc, cleanup);
/* eval */
if (options & LYXP_SCNODE_ALL) {
warn_operands(set->ctx, set, &set2, 1, exp->expr, exp->tok_pos[this_op - 1]);
lyxp_set_scnode_merge(set, &set2);
set_scnode_clear_ctx(set);
} else {
rc = moveto_op_comp(set, &set2, &exp->expr[exp->tok_pos[this_op]], options);
LY_CHECK_GOTO(rc, cleanup);
}
}
cleanup:
lyxp_set_cast(&orig_set, LYXP_SET_EMPTY);
lyxp_set_cast(&set2, LYXP_SET_EMPTY);
return rc;
}
/**
* @brief Evaluate EqualityExpr. Logs directly on error.
*
* [13] EqualityExpr ::= RelationalExpr | EqualityExpr '=' RelationalExpr
* | EqualityExpr '!=' RelationalExpr
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in] repeat How many times this expression is repeated.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_equality_expr(struct lyxp_expr *exp, uint16_t *exp_idx, uint16_t repeat, struct lyxp_set *set, int options)
{
LY_ERR rc;
uint16_t this_op;
struct lyxp_set orig_set, set2;
uint16_t i;
assert(repeat);
set_init(&orig_set, set);
set_init(&set2, set);
set_fill_set(&orig_set, set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_EQUALITY, set, options);
LY_CHECK_GOTO(rc, cleanup);
/* ('=' / '!=' RelationalExpr)* */
for (i = 0; i < repeat; ++i) {
this_op = *exp_idx;
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_OPERATOR_COMP);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (set ? "parsed" : "skipped"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
if (!set) {
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_EQUALITY, NULL, options);
LY_CHECK_GOTO(rc, cleanup);
continue;
}
set_fill_set(&set2, &orig_set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_EQUALITY, &set2, options);
LY_CHECK_GOTO(rc, cleanup);
/* eval */
if (options & LYXP_SCNODE_ALL) {
warn_operands(set->ctx, set, &set2, 0, exp->expr, exp->tok_pos[this_op - 1]);
warn_equality_value(exp, set, *exp_idx - 1, this_op - 1, *exp_idx - 1);
warn_equality_value(exp, &set2, this_op - 1, this_op - 1, *exp_idx - 1);
lyxp_set_scnode_merge(set, &set2);
set_scnode_clear_ctx(set);
} else {
/* special handling of evaluations of identityref comparisons, always compare prefixed identites */
if ((set->type == LYXP_SET_NODE_SET) && (set->val.nodes[0].node->schema->nodetype & (LYS_LEAF | LYS_LEAFLIST))
&& (((struct lysc_node_leaf *)set->val.nodes[0].node->schema)->type->basetype == LY_TYPE_IDENT)) {
/* left operand is identityref */
if ((set2.type == LYXP_SET_STRING) && !strchr(set2.val.str, ':')) {
/* missing prefix in the right operand */
set2.val.str = ly_realloc(set2.val.str, strlen(set->local_mod->name) + 1 + strlen(set2.val.str) + 1);
if (!set2.val.str) {
goto cleanup;
}
memmove(set2.val.str + strlen(set->local_mod->name) + 1, set2.val.str, strlen(set2.val.str) + 1);
memcpy(set2.val.str, set->local_mod->name, strlen(set->local_mod->name));
set2.val.str[strlen(set->local_mod->name)] = ':';
}
}
rc = moveto_op_comp(set, &set2, &exp->expr[exp->tok_pos[this_op]], options);
LY_CHECK_GOTO(rc, cleanup);
}
}
cleanup:
lyxp_set_cast(&orig_set, LYXP_SET_EMPTY);
lyxp_set_cast(&set2, LYXP_SET_EMPTY);
return rc;
}
/**
* @brief Evaluate AndExpr. Logs directly on error.
*
* [12] AndExpr ::= EqualityExpr | AndExpr 'and' EqualityExpr
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in] repeat How many times this expression is repeated.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_and_expr(struct lyxp_expr *exp, uint16_t *exp_idx, uint16_t repeat, struct lyxp_set *set, int options)
{
LY_ERR rc;
struct lyxp_set orig_set, set2;
uint16_t i;
assert(repeat);
set_init(&orig_set, set);
set_init(&set2, set);
set_fill_set(&orig_set, set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_AND, set, options);
LY_CHECK_GOTO(rc, cleanup);
/* cast to boolean, we know that will be the final result */
if (set && (options & LYXP_SCNODE_ALL)) {
set_scnode_clear_ctx(set);
} else {
lyxp_set_cast(set, LYXP_SET_BOOLEAN);
}
/* ('and' EqualityExpr)* */
for (i = 0; i < repeat; ++i) {
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_OPERATOR_LOG);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (!set || !set->val.bool ? "skipped" : "parsed"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
/* lazy evaluation */
if (!set || ((set->type == LYXP_SET_BOOLEAN) && !set->val.bool)) {
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_AND, NULL, options);
LY_CHECK_GOTO(rc, cleanup);
continue;
}
set_fill_set(&set2, &orig_set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_AND, &set2, options);
LY_CHECK_GOTO(rc, cleanup);
/* eval - just get boolean value actually */
if (set->type == LYXP_SET_SCNODE_SET) {
set_scnode_clear_ctx(&set2);
lyxp_set_scnode_merge(set, &set2);
} else {
lyxp_set_cast(&set2, LYXP_SET_BOOLEAN);
set_fill_set(set, &set2);
}
}
cleanup:
lyxp_set_cast(&orig_set, LYXP_SET_EMPTY);
lyxp_set_cast(&set2, LYXP_SET_EMPTY);
return rc;
}
/**
* @brief Evaluate OrExpr. Logs directly on error.
*
* [11] OrExpr ::= AndExpr | OrExpr 'or' AndExpr
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in] repeat How many times this expression is repeated.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_or_expr(struct lyxp_expr *exp, uint16_t *exp_idx, uint16_t repeat, struct lyxp_set *set, int options)
{
LY_ERR rc;
struct lyxp_set orig_set, set2;
uint16_t i;
assert(repeat);
set_init(&orig_set, set);
set_init(&set2, set);
set_fill_set(&orig_set, set);
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_OR, set, options);
LY_CHECK_GOTO(rc, cleanup);
/* cast to boolean, we know that will be the final result */
if (set && (options & LYXP_SCNODE_ALL)) {
set_scnode_clear_ctx(set);
} else {
lyxp_set_cast(set, LYXP_SET_BOOLEAN);
}
/* ('or' AndExpr)* */
for (i = 0; i < repeat; ++i) {
assert(exp->tokens[*exp_idx] == LYXP_TOKEN_OPERATOR_LOG);
LOGDBG(LY_LDGXPATH, "%-27s %s %s[%u]", __func__, (!set || set->val.bool ? "skipped" : "parsed"),
print_token(exp->tokens[*exp_idx]), exp->tok_pos[*exp_idx]);
++(*exp_idx);
/* lazy evaluation */
if (!set || ((set->type == LYXP_SET_BOOLEAN) && set->val.bool)) {
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_OR, NULL, options);
LY_CHECK_GOTO(rc, cleanup);
continue;
}
set_fill_set(&set2, &orig_set);
/* expr_type cound have been LYXP_EXPR_NONE in all these later calls (except for the first one),
* but it does not matter */
rc = eval_expr_select(exp, exp_idx, LYXP_EXPR_OR, &set2, options);
LY_CHECK_GOTO(rc, cleanup);
/* eval - just get boolean value actually */
if (set->type == LYXP_SET_SCNODE_SET) {
set_scnode_clear_ctx(&set2);
lyxp_set_scnode_merge(set, &set2);
} else {
lyxp_set_cast(&set2, LYXP_SET_BOOLEAN);
set_fill_set(set, &set2);
}
}
cleanup:
lyxp_set_cast(&orig_set, LYXP_SET_EMPTY);
lyxp_set_cast(&set2, LYXP_SET_EMPTY);
return rc;
}
/**
* @brief Decide what expression is at the pointer @p exp_idx and evaluate it accordingly.
*
* @param[in] exp Parsed XPath expression.
* @param[in] exp_idx Position in the expression @p exp.
* @param[in] etype Expression type to evaluate.
* @param[in,out] set Context and result set. On NULL the rule is only parsed.
* @param[in] options XPath options.
* @return LY_ERR (LY_EINCOMPLETE on unresolved when)
*/
static LY_ERR
eval_expr_select(struct lyxp_expr *exp, uint16_t *exp_idx, enum lyxp_expr_type etype, struct lyxp_set *set, int options)
{
uint16_t i, count;
enum lyxp_expr_type next_etype;
LY_ERR rc;
/* process operator repeats */
if (!exp->repeat[*exp_idx]) {
next_etype = LYXP_EXPR_NONE;
} else {
/* find etype repeat */
for (i = 0; exp->repeat[*exp_idx][i] > etype; ++i);
/* select one-priority lower because etype expression called us */
if (i) {
next_etype = exp->repeat[*exp_idx][i - 1];
/* count repeats for that expression */
for (count = 0; i && exp->repeat[*exp_idx][i - 1] == next_etype; ++count, --i);
} else {
next_etype = LYXP_EXPR_NONE;
}
}
/* decide what expression are we parsing based on the repeat */
switch (next_etype) {
case LYXP_EXPR_OR:
rc = eval_or_expr(exp, exp_idx, count, set, options);
break;
case LYXP_EXPR_AND:
rc = eval_and_expr(exp, exp_idx, count, set, options);
break;
case LYXP_EXPR_EQUALITY:
rc = eval_equality_expr(exp, exp_idx, count, set, options);
break;
case LYXP_EXPR_RELATIONAL:
rc = eval_relational_expr(exp, exp_idx, count, set, options);
break;
case LYXP_EXPR_ADDITIVE:
rc = eval_additive_expr(exp, exp_idx, count, set, options);
break;
case LYXP_EXPR_MULTIPLICATIVE:
rc = eval_multiplicative_expr(exp, exp_idx, count, set, options);
break;
case LYXP_EXPR_UNARY:
rc = eval_unary_expr(exp, exp_idx, count, set, options);
break;
case LYXP_EXPR_UNION:
rc = eval_union_expr(exp, exp_idx, count, set, options);
break;
case LYXP_EXPR_NONE:
rc = eval_path_expr(exp, exp_idx, set, options);
break;
default:
LOGINT_RET(set->ctx);
}
return rc;
}
/**
* @brief Get root type.
*
* @param[in] ctx_node Context node.
* @param[in] ctx_scnode Schema context node.
* @param[in] options XPath options.
* @return Root type.
*/
static enum lyxp_node_type
lyxp_get_root_type(const struct lyd_node *ctx_node, const struct lysc_node *ctx_scnode, int options)
{
if (options & LYXP_SCNODE_ALL) {
if (options & LYXP_SCNODE) {
/* general root that can access everything */
return LYXP_NODE_ROOT;
} else if (!ctx_scnode || (ctx_scnode->flags & LYS_CONFIG_W)) {
/* root context node can access only config data (because we said so, it is unspecified) */
return LYXP_NODE_ROOT_CONFIG;
} else {
return LYXP_NODE_ROOT;
}
}
if (!ctx_node || (ctx_node->schema->flags & LYS_CONFIG_W)) {
/* root context node can access only config data (because we said so, it is unspecified) */
return LYXP_NODE_ROOT_CONFIG;
}
return LYXP_NODE_ROOT;
}
LY_ERR
lyxp_eval(struct lyxp_expr *exp, LYD_FORMAT format, const struct lys_module *local_mod, const struct lyd_node *ctx_node,
enum lyxp_node_type ctx_node_type, const struct lyd_node **trees, struct lyxp_set *set, int options)
{
uint16_t exp_idx = 0;
LY_ERR rc;
LY_CHECK_ARG_RET(NULL, exp, local_mod, set, LY_EINVAL);
/* prepare set for evaluation */
exp_idx = 0;
memset(set, 0, sizeof *set);
set->type = LYXP_SET_EMPTY;
set_insert_node(set, (struct lyd_node *)ctx_node, 0, ctx_node_type, options);
set->ctx = local_mod->ctx;
set->ctx_node = ctx_node;
set->root_type = lyxp_get_root_type(ctx_node, NULL, options);
set->local_mod = local_mod;
set->trees = trees;
set->format = format;
/* evaluate */
rc = eval_expr_select(exp, &exp_idx, 0, set, options);
if (rc != LY_SUCCESS) {
lyxp_set_cast(set, LYXP_SET_EMPTY);
}
return rc;
}
#if 0
/* full xml printing of set elements, not used currently */
void
lyxp_set_print_xml(FILE *f, struct lyxp_set *set)
{
uint32_t i;
char *str_num;
struct lyout out;
memset(&out, 0, sizeof out);
out.type = LYOUT_STREAM;
out.method.f = f;
switch (set->type) {
case LYXP_SET_EMPTY:
ly_print(&out, "Empty XPath set\n\n");
break;
case LYXP_SET_BOOLEAN:
ly_print(&out, "Boolean XPath set:\n");
ly_print(&out, "%s\n\n", set->value.bool ? "true" : "false");
break;
case LYXP_SET_STRING:
ly_print(&out, "String XPath set:\n");
ly_print(&out, "\"%s\"\n\n", set->value.str);
break;
case LYXP_SET_NUMBER:
ly_print(&out, "Number XPath set:\n");
if (isnan(set->value.num)) {
str_num = strdup("NaN");
} else if ((set->value.num == 0) || (set->value.num == -0.0f)) {
str_num = strdup("0");
} else if (isinf(set->value.num) && !signbit(set->value.num)) {
str_num = strdup("Infinity");
} else if (isinf(set->value.num) && signbit(set->value.num)) {
str_num = strdup("-Infinity");
} else if ((long long)set->value.num == set->value.num) {
if (asprintf(&str_num, "%lld", (long long)set->value.num) == -1) {
str_num = NULL;
}
} else {
if (asprintf(&str_num, "%03.1Lf", set->value.num) == -1) {
str_num = NULL;
}
}
if (!str_num) {
LOGMEM;
return;
}
ly_print(&out, "%s\n\n", str_num);
free(str_num);
break;
case LYXP_SET_NODE_SET:
ly_print(&out, "Node XPath set:\n");
for (i = 0; i < set->used; ++i) {
ly_print(&out, "%d. ", i + 1);
switch (set->node_type[i]) {
case LYXP_NODE_ROOT_ALL:
ly_print(&out, "ROOT all\n\n");
break;
case LYXP_NODE_ROOT_CONFIG:
ly_print(&out, "ROOT config\n\n");
break;
case LYXP_NODE_ROOT_STATE:
ly_print(&out, "ROOT state\n\n");
break;
case LYXP_NODE_ROOT_NOTIF:
ly_print(&out, "ROOT notification \"%s\"\n\n", set->value.nodes[i]->schema->name);
break;
case LYXP_NODE_ROOT_RPC:
ly_print(&out, "ROOT rpc \"%s\"\n\n", set->value.nodes[i]->schema->name);
break;
case LYXP_NODE_ROOT_OUTPUT:
ly_print(&out, "ROOT output \"%s\"\n\n", set->value.nodes[i]->schema->name);
break;
case LYXP_NODE_ELEM:
ly_print(&out, "ELEM \"%s\"\n", set->value.nodes[i]->schema->name);
xml_print_node(&out, 1, set->value.nodes[i], 1, LYP_FORMAT);
ly_print(&out, "\n");
break;
case LYXP_NODE_TEXT:
ly_print(&out, "TEXT \"%s\"\n\n", ((struct lyd_node_leaf_list *)set->value.nodes[i])->value_str);
break;
case LYXP_NODE_ATTR:
ly_print(&out, "ATTR \"%s\" = \"%s\"\n\n", set->value.attrs[i]->name, set->value.attrs[i]->value);
break;
}
}
break;
}
}
#endif
LY_ERR
lyxp_set_cast(struct lyxp_set *set, enum lyxp_set_type target)
{
long double num;
char *str;
LY_ERR rc;
if (!set || (set->type == target)) {
return LY_SUCCESS;
}
/* it's not possible to convert anything into a node set */
assert((target != LYXP_SET_NODE_SET) && ((set->type != LYXP_SET_SCNODE_SET) || (target == LYXP_SET_EMPTY)));
if (set->type == LYXP_SET_SCNODE_SET) {
set_free_content(set);
return LY_EINVAL;
}
/* to STRING */
if ((target == LYXP_SET_STRING) || ((target == LYXP_SET_NUMBER)
&& ((set->type == LYXP_SET_NODE_SET) || (set->type == LYXP_SET_EMPTY)))) {
switch (set->type) {
case LYXP_SET_NUMBER:
if (isnan(set->val.num)) {
set->val.str = strdup("NaN");
LY_CHECK_ERR_RET(!set->val.str, LOGMEM(set->ctx), -1);
} else if ((set->val.num == 0) || (set->val.num == -0.0f)) {
set->val.str = strdup("0");
LY_CHECK_ERR_RET(!set->val.str, LOGMEM(set->ctx), -1);
} else if (isinf(set->val.num) && !signbit(set->val.num)) {
set->val.str = strdup("Infinity");
LY_CHECK_ERR_RET(!set->val.str, LOGMEM(set->ctx), -1);
} else if (isinf(set->val.num) && signbit(set->val.num)) {
set->val.str = strdup("-Infinity");
LY_CHECK_ERR_RET(!set->val.str, LOGMEM(set->ctx), -1);
} else if ((long long)set->val.num == set->val.num) {
if (asprintf(&str, "%lld", (long long)set->val.num) == -1) {
LOGMEM_RET(set->ctx);
}
set->val.str = str;
} else {
if (asprintf(&str, "%03.1Lf", set->val.num) == -1) {
LOGMEM_RET(set->ctx);
}
set->val.str = str;
}
break;
case LYXP_SET_BOOLEAN:
if (set->val.bool) {
set->val.str = strdup("true");
} else {
set->val.str = strdup("false");
}
LY_CHECK_ERR_RET(!set->val.str, LOGMEM(set->ctx), LY_EMEM);
break;
case LYXP_SET_NODE_SET:
assert(set->used);
/* we need the set sorted, it affects the result */
assert(!set_sort(set));
rc = cast_node_set_to_string(set, &str);
LY_CHECK_RET(rc);
set_free_content(set);
set->val.str = str;
break;
case LYXP_SET_EMPTY:
set->val.str = strdup("");
LY_CHECK_ERR_RET(!set->val.str, LOGMEM(set->ctx), LY_EMEM);
break;
default:
LOGINT_RET(set->ctx);
}
set->type = LYXP_SET_STRING;
}
/* to NUMBER */
if (target == LYXP_SET_NUMBER) {
switch (set->type) {
case LYXP_SET_STRING:
num = cast_string_to_number(set->val.str);
set_free_content(set);
set->val.num = num;
break;
case LYXP_SET_BOOLEAN:
if (set->val.bool) {
set->val.num = 1;
} else {
set->val.num = 0;
}
break;
default:
LOGINT_RET(set->ctx);
}
set->type = LYXP_SET_NUMBER;
}
/* to BOOLEAN */
if (target == LYXP_SET_BOOLEAN) {
switch (set->type) {
case LYXP_SET_NUMBER:
if ((set->val.num == 0) || (set->val.num == -0.0f) || isnan(set->val.num)) {
set->val.bool = 0;
} else {
set->val.bool = 1;
}
break;
case LYXP_SET_STRING:
if (set->val.str[0]) {
set_free_content(set);
set->val.bool = 1;
} else {
set_free_content(set);
set->val.bool = 0;
}
break;
case LYXP_SET_NODE_SET:
set_free_content(set);
assert(set->used);
set->val.bool = 1;
break;
case LYXP_SET_EMPTY:
set->val.bool = 0;
break;
default:
LOGINT_RET(set->ctx);
}
set->type = LYXP_SET_BOOLEAN;
}
/* to EMPTY */
if (target == LYXP_SET_EMPTY) {
set_free_content(set);
set->type = LYXP_SET_EMPTY;
}
return LY_SUCCESS;
}
LY_ERR
lyxp_atomize(struct lyxp_expr *exp, LYD_FORMAT format, const struct lys_module *local_mod, const struct lysc_node *ctx_scnode,
enum lyxp_node_type ctx_scnode_type, struct lyxp_set *set, int options)
{
struct ly_ctx *ctx;
uint16_t exp_idx = 0;
LY_CHECK_ARG_RET(NULL, exp, local_mod, set, LY_EINVAL);
ctx = local_mod->ctx;
/* prepare set for evaluation */
exp_idx = 0;
memset(set, 0, sizeof *set);
set->type = LYXP_SET_SCNODE_SET;
lyxp_set_scnode_insert_node(set, ctx_scnode, ctx_scnode_type);
set->val.scnodes[0].in_ctx = -2;
set->ctx = ctx;
set->ctx_scnode = ctx_scnode;
set->root_type = lyxp_get_root_type(NULL, ctx_scnode, options);
set->local_mod = local_mod;
set->format = format;
/* evaluate */
return eval_expr_select(exp, &exp_idx, 0, set, options);
}