blob: f9bc9947c38293300eb307ce7e160a1da7a9e0de [file] [log] [blame]
Michal Vasko004d3152020-06-11 19:59:22 +02001/**
2 * @file path.c
3 * @author Michal Vasko <mvasko@cesnet.cz>
4 * @brief Path functions
5 *
6 * Copyright (c) 2020 CESNET, z.s.p.o.
7 *
8 * This source code is licensed under BSD 3-Clause License (the "License").
9 * You may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
11 *
12 * https://opensource.org/licenses/BSD-3-Clause
13 */
Michal Vasko004d3152020-06-11 19:59:22 +020014#include "path.h"
15
16#include <assert.h>
17#include <ctype.h>
18#include <stdlib.h>
Radek Krejciad97c5f2020-06-30 09:19:28 +020019#include <string.h>
Michal Vasko004d3152020-06-11 19:59:22 +020020
21#include "common.h"
Michal Vasko5aa44c02020-06-29 11:47:02 +020022#include "compat.h"
Michal Vasko004d3152020-06-11 19:59:22 +020023#include "log.h"
24#include "plugins_types.h"
Michal Vasko40c158c2021-04-28 17:01:03 +020025#include "schema_compile.h"
Radek Krejciad97c5f2020-06-30 09:19:28 +020026#include "set.h"
Michal Vasko4c583e82020-07-17 12:16:14 +020027#include "tree.h"
Michal Vasko004d3152020-06-11 19:59:22 +020028#include "tree_data_internal.h"
Radek Krejci859a15a2021-03-05 20:56:59 +010029#include "tree_edit.h"
Radek Krejciad97c5f2020-06-30 09:19:28 +020030#include "tree_schema.h"
Michal Vasko004d3152020-06-11 19:59:22 +020031#include "tree_schema_internal.h"
32#include "xpath.h"
33
Radek Krejcic0c66412020-08-21 13:53:50 +020034#define LOGVAL_P(CTX, CUR_NODE, CODE, ...) ly_vlog(CTX, (CUR_NODE) ? LY_VLOG_LYSC : LY_VLOG_NONE, CUR_NODE, CODE, ##__VA_ARGS__)
Michal Vasko6b26e742020-07-17 15:02:10 +020035
Michal Vasko004d3152020-06-11 19:59:22 +020036/**
37 * @brief Check predicate syntax.
38 *
39 * @param[in] ctx libyang context.
Michal Vasko6b26e742020-07-17 15:02:10 +020040 * @param[in] cur_node Current (original context) node.
Michal Vasko004d3152020-06-11 19:59:22 +020041 * @param[in] exp Parsed predicate.
42 * @param[in,out] tok_idx Index in @p exp, is adjusted.
43 * @param[in] prefix Prefix option.
44 * @param[in] pred Predicate option.
45 * @return LY_ERR value.
46 */
47static LY_ERR
Michal Vasko6b26e742020-07-17 15:02:10 +020048ly_path_check_predicate(const struct ly_ctx *ctx, const struct lysc_node *cur_node, const struct lyxp_expr *exp,
Radek Krejci0f969882020-08-21 16:56:47 +020049 uint16_t *tok_idx, uint8_t prefix, uint8_t pred)
Michal Vasko004d3152020-06-11 19:59:22 +020050{
Radek Krejciba03a5a2020-08-27 14:40:41 +020051 LY_ERR ret = LY_SUCCESS;
Michal Vasko004d3152020-06-11 19:59:22 +020052 struct ly_set *set = NULL;
53 uint32_t i;
54 const char *name;
55 size_t name_len;
56
Radek Krejciddace2c2021-01-08 11:30:56 +010057 LOG_LOCSET(cur_node, NULL, NULL, NULL);
Radek Krejci2efc45b2020-12-22 16:25:44 +010058
Michal Vasko004d3152020-06-11 19:59:22 +020059 if (!lyxp_next_token(NULL, exp, tok_idx, LYXP_TOKEN_BRACK1)) {
Radek Krejcif6a11002020-08-21 13:29:07 +020060 /* '[' */
61
Michal Vasko69730152020-10-09 16:30:07 +020062 if (((pred == LY_PATH_PRED_SIMPLE) || (pred == LY_PATH_PRED_KEYS)) &&
63 !lyxp_check_token(NULL, exp, *tok_idx, LYXP_TOKEN_NAMETEST)) {
Radek Krejciba03a5a2020-08-27 14:40:41 +020064 ret = ly_set_new(&set);
65 LY_CHECK_GOTO(ret, cleanup);
Michal Vasko004d3152020-06-11 19:59:22 +020066
67 do {
68 /* NameTest is always expected here */
Radek Krejciba03a5a2020-08-27 14:40:41 +020069 LY_CHECK_GOTO(lyxp_check_token(ctx, exp, *tok_idx, LYXP_TOKEN_NAMETEST), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +020070
71 /* check prefix based on the options */
72 name = strnstr(exp->expr + exp->tok_pos[*tok_idx], ":", exp->tok_len[*tok_idx]);
73 if ((prefix == LY_PATH_PREFIX_MANDATORY) && !name) {
Radek Krejci2efc45b2020-12-22 16:25:44 +010074 LOGVAL(ctx, LYVE_XPATH, "Prefix missing for \"%.*s\" in path.", exp->tok_len[*tok_idx],
Michal Vasko69730152020-10-09 16:30:07 +020075 exp->expr + exp->tok_pos[*tok_idx]);
Radek Krejciba03a5a2020-08-27 14:40:41 +020076 goto token_error;
Michal Vasko8b06a5e2020-08-06 12:13:08 +020077 } else if ((prefix == LY_PATH_PREFIX_STRICT_INHERIT) && name) {
Radek Krejci2efc45b2020-12-22 16:25:44 +010078 LOGVAL(ctx, LYVE_XPATH, "Redundant prefix for \"%.*s\" in path.", exp->tok_len[*tok_idx],
Michal Vasko69730152020-10-09 16:30:07 +020079 exp->expr + exp->tok_pos[*tok_idx]);
Radek Krejciba03a5a2020-08-27 14:40:41 +020080 goto token_error;
Michal Vasko004d3152020-06-11 19:59:22 +020081 }
82 if (!name) {
83 name = exp->expr + exp->tok_pos[*tok_idx];
84 name_len = exp->tok_len[*tok_idx];
85 } else {
86 ++name;
87 name_len = exp->tok_len[*tok_idx] - (name - (exp->expr + exp->tok_pos[*tok_idx]));
88 }
89
90 /* check whether it was not already specified */
91 for (i = 0; i < set->count; ++i) {
92 /* all the keys must be from the same module so this comparison should be fine */
93 if (!strncmp(set->objs[i], name, name_len) && !isalpha(((char *)set->objs[i])[name_len])) {
Radek Krejci422afb12021-03-04 16:38:16 +010094 LOGVAL(ctx, LYVE_XPATH, "Duplicate predicate key \"%.*s\" in path.", (int)name_len, name);
Radek Krejciba03a5a2020-08-27 14:40:41 +020095 goto token_error;
Michal Vasko004d3152020-06-11 19:59:22 +020096 }
97 }
98
99 /* add it into the set */
Radek Krejci3d92e442020-10-12 12:48:13 +0200100 ret = ly_set_add(set, (void *)name, 1, NULL);
Radek Krejciba03a5a2020-08-27 14:40:41 +0200101 LY_CHECK_GOTO(ret, cleanup);
Michal Vasko004d3152020-06-11 19:59:22 +0200102
103 /* NameTest */
104 ++(*tok_idx);
105
106 /* '=' */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200107 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_OPER_EQUAL), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200108
Michal Vasko4911eeb2021-06-28 11:23:05 +0200109 /* Literal or Number */
110 LY_CHECK_GOTO(lyxp_next_token2(ctx, exp, tok_idx, LYXP_TOKEN_LITERAL, LYXP_TOKEN_NUMBER), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200111
112 /* ']' */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200113 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_BRACK2), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200114
Radek Krejci0f969882020-08-21 16:56:47 +0200115 /* '[' */
Michal Vasko004d3152020-06-11 19:59:22 +0200116 } while (!lyxp_next_token(NULL, exp, tok_idx, LYXP_TOKEN_BRACK1));
117
Michal Vasko004d3152020-06-11 19:59:22 +0200118 } else if ((pred == LY_PATH_PRED_SIMPLE) && !lyxp_next_token(NULL, exp, tok_idx, LYXP_TOKEN_DOT)) {
Radek Krejcif6a11002020-08-21 13:29:07 +0200119 /* '.' */
120
Michal Vasko004d3152020-06-11 19:59:22 +0200121 /* '=' */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200122 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_OPER_EQUAL), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200123
Michal Vasko4911eeb2021-06-28 11:23:05 +0200124 /* Literal or Number */
125 LY_CHECK_GOTO(lyxp_next_token2(ctx, exp, tok_idx, LYXP_TOKEN_LITERAL, LYXP_TOKEN_NUMBER), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200126
127 /* ']' */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200128 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_BRACK2), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200129
Michal Vasko004d3152020-06-11 19:59:22 +0200130 } else if ((pred == LY_PATH_PRED_SIMPLE) && !lyxp_next_token(NULL, exp, tok_idx, LYXP_TOKEN_NUMBER)) {
Radek Krejcif6a11002020-08-21 13:29:07 +0200131 /* Number */
Michal Vasko004d3152020-06-11 19:59:22 +0200132
133 /* ']' */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200134 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_BRACK2), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200135
136 } else if ((pred == LY_PATH_PRED_LEAFREF) && !lyxp_check_token(NULL, exp, *tok_idx, LYXP_TOKEN_NAMETEST)) {
137 assert(prefix == LY_PATH_PREFIX_OPTIONAL);
Radek Krejciba03a5a2020-08-27 14:40:41 +0200138 ret = ly_set_new(&set);
139 LY_CHECK_GOTO(ret, cleanup);
Michal Vasko004d3152020-06-11 19:59:22 +0200140
141 do {
142 /* NameTest is always expected here */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200143 LY_CHECK_GOTO(lyxp_check_token(ctx, exp, *tok_idx, LYXP_TOKEN_NAMETEST), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200144
145 name = strnstr(exp->expr + exp->tok_pos[*tok_idx], ":", exp->tok_len[*tok_idx]);
146 if (!name) {
147 name = exp->expr + exp->tok_pos[*tok_idx];
148 name_len = exp->tok_len[*tok_idx];
149 } else {
150 ++name;
151 name_len = exp->tok_len[*tok_idx] - (name - (exp->expr + exp->tok_pos[*tok_idx]));
152 }
153
154 /* check whether it was not already specified */
155 for (i = 0; i < set->count; ++i) {
156 /* all the keys must be from the same module so this comparison should be fine */
157 if (!strncmp(set->objs[i], name, name_len) && !isalpha(((char *)set->objs[i])[name_len])) {
Radek Krejci422afb12021-03-04 16:38:16 +0100158 LOGVAL(ctx, LYVE_XPATH, "Duplicate predicate key \"%.*s\" in path.", (int)name_len, name);
Radek Krejciba03a5a2020-08-27 14:40:41 +0200159 goto token_error;
Michal Vasko004d3152020-06-11 19:59:22 +0200160 }
161 }
162
163 /* add it into the set */
Radek Krejci3d92e442020-10-12 12:48:13 +0200164 ret = ly_set_add(set, (void *)name, 1, NULL);
Radek Krejciba03a5a2020-08-27 14:40:41 +0200165 LY_CHECK_GOTO(ret, cleanup);
Michal Vasko004d3152020-06-11 19:59:22 +0200166
167 /* NameTest */
168 ++(*tok_idx);
169
170 /* '=' */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200171 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_OPER_EQUAL), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200172
173 /* FuncName */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200174 LY_CHECK_GOTO(lyxp_check_token(ctx, exp, *tok_idx, LYXP_TOKEN_FUNCNAME), token_error);
Radek Krejcif13b87b2020-12-01 22:02:17 +0100175 if ((exp->tok_len[*tok_idx] != ly_strlen_const("current")) ||
176 strncmp(exp->expr + exp->tok_pos[*tok_idx], "current", ly_strlen_const("current"))) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100177 LOGVAL(ctx, LYVE_XPATH, "Invalid function \"%.*s\" invocation in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200178 exp->tok_len[*tok_idx], exp->expr + exp->tok_pos[*tok_idx]);
Radek Krejciba03a5a2020-08-27 14:40:41 +0200179 goto token_error;
Michal Vasko004d3152020-06-11 19:59:22 +0200180 }
181 ++(*tok_idx);
182
183 /* '(' */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200184 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_PAR1), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200185
186 /* ')' */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200187 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_PAR2), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200188
189 /* '/' */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200190 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_OPER_PATH), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200191
192 /* '..' */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200193 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_DDOT), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200194 do {
195 /* '/' */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200196 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_OPER_PATH), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200197 } while (!lyxp_next_token(NULL, exp, tok_idx, LYXP_TOKEN_DDOT));
198
199 /* NameTest */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200200 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_NAMETEST), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200201
202 /* '/' */
203 while (!lyxp_next_token(NULL, exp, tok_idx, LYXP_TOKEN_OPER_PATH)) {
204 /* NameTest */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200205 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_NAMETEST), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200206 }
207
208 /* ']' */
Radek Krejciba03a5a2020-08-27 14:40:41 +0200209 LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_BRACK2), token_error);
Michal Vasko004d3152020-06-11 19:59:22 +0200210
Radek Krejci0f969882020-08-21 16:56:47 +0200211 /* '[' */
Michal Vasko004d3152020-06-11 19:59:22 +0200212 } while (!lyxp_next_token(NULL, exp, tok_idx, LYXP_TOKEN_BRACK1));
213
214 } else {
Michal Vasko49fec8e2022-05-24 10:28:33 +0200215 LOGVAL(ctx, LY_VCODE_XP_INTOK, lyxp_token2str(exp->tokens[*tok_idx]), exp->expr + exp->tok_pos[*tok_idx]);
Radek Krejciba03a5a2020-08-27 14:40:41 +0200216 goto token_error;
Michal Vasko004d3152020-06-11 19:59:22 +0200217 }
218 }
219
Radek Krejciba03a5a2020-08-27 14:40:41 +0200220cleanup:
Radek Krejciddace2c2021-01-08 11:30:56 +0100221 LOG_LOCBACK(cur_node ? 1 : 0, 0, 0, 0);
Michal Vasko004d3152020-06-11 19:59:22 +0200222 ly_set_free(set, NULL);
Radek Krejciba03a5a2020-08-27 14:40:41 +0200223 return ret;
Michal Vasko004d3152020-06-11 19:59:22 +0200224
Radek Krejciba03a5a2020-08-27 14:40:41 +0200225token_error:
Radek Krejciddace2c2021-01-08 11:30:56 +0100226 LOG_LOCBACK(cur_node ? 1 : 0, 0, 0, 0);
Michal Vasko004d3152020-06-11 19:59:22 +0200227 ly_set_free(set, NULL);
228 return LY_EVALID;
229}
230
231LY_ERR
Michal Vasko6b26e742020-07-17 15:02:10 +0200232ly_path_parse(const struct ly_ctx *ctx, const struct lysc_node *ctx_node, const char *str_path, size_t path_len,
Michal Vaskoed725d72021-06-23 12:03:45 +0200233 ly_bool lref, uint8_t begin, uint8_t prefix, uint8_t pred, struct lyxp_expr **expr)
Michal Vasko004d3152020-06-11 19:59:22 +0200234{
Radek Krejcif03a9e22020-09-18 20:09:31 +0200235 LY_ERR ret = LY_SUCCESS;
236 struct lyxp_expr *exp = NULL;
Michal Vasko8b06a5e2020-08-06 12:13:08 +0200237 uint16_t tok_idx, cur_len;
238 const char *cur_node, *prev_prefix = NULL, *ptr;
Michal Vasko004d3152020-06-11 19:59:22 +0200239
240 assert((begin == LY_PATH_BEGIN_ABSOLUTE) || (begin == LY_PATH_BEGIN_EITHER));
Michal Vasko69730152020-10-09 16:30:07 +0200241 assert((prefix == LY_PATH_PREFIX_OPTIONAL) || (prefix == LY_PATH_PREFIX_MANDATORY) ||
242 (prefix == LY_PATH_PREFIX_STRICT_INHERIT));
Michal Vasko004d3152020-06-11 19:59:22 +0200243 assert((pred == LY_PATH_PRED_KEYS) || (pred == LY_PATH_PRED_SIMPLE) || (pred == LY_PATH_PRED_LEAFREF));
244
Radek Krejciddace2c2021-01-08 11:30:56 +0100245 LOG_LOCSET(ctx_node, NULL, NULL, NULL);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100246
Michal Vasko004d3152020-06-11 19:59:22 +0200247 /* parse as a generic XPath expression */
Radek Krejcif03a9e22020-09-18 20:09:31 +0200248 LY_CHECK_GOTO(ret = lyxp_expr_parse(ctx, str_path, path_len, 1, &exp), error);
Michal Vasko004d3152020-06-11 19:59:22 +0200249 tok_idx = 0;
250
251 if (begin == LY_PATH_BEGIN_EITHER) {
252 /* is the path relative? */
253 if (lyxp_next_token(NULL, exp, &tok_idx, LYXP_TOKEN_OPER_PATH)) {
Michal Vaskocb8c6d42020-10-16 11:58:30 +0200254 /* relative path check specific to leafref */
Michal Vaskoed725d72021-06-23 12:03:45 +0200255 if (lref) {
Michal Vaskocb8c6d42020-10-16 11:58:30 +0200256 /* mandatory '..' */
257 LY_CHECK_ERR_GOTO(lyxp_next_token(ctx, exp, &tok_idx, LYXP_TOKEN_DDOT), ret = LY_EVALID, error);
258
259 do {
260 /* '/' */
261 LY_CHECK_ERR_GOTO(lyxp_next_token(ctx, exp, &tok_idx, LYXP_TOKEN_OPER_PATH), ret = LY_EVALID, error);
262
263 /* optional '..' */
264 } while (!lyxp_next_token(NULL, exp, &tok_idx, LYXP_TOKEN_DDOT));
Michal Vasko004d3152020-06-11 19:59:22 +0200265 }
266 }
267 } else {
268 /* '/' */
Radek Krejcif03a9e22020-09-18 20:09:31 +0200269 LY_CHECK_ERR_GOTO(lyxp_next_token(ctx, exp, &tok_idx, LYXP_TOKEN_OPER_PATH), ret = LY_EVALID, error);
Michal Vasko004d3152020-06-11 19:59:22 +0200270 }
271
272 do {
273 /* NameTest */
Radek Krejcif03a9e22020-09-18 20:09:31 +0200274 LY_CHECK_ERR_GOTO(lyxp_check_token(ctx, exp, tok_idx, LYXP_TOKEN_NAMETEST), ret = LY_EVALID, error);
Michal Vasko004d3152020-06-11 19:59:22 +0200275
276 /* check prefix based on the options */
Michal Vasko8b06a5e2020-08-06 12:13:08 +0200277 cur_node = exp->expr + exp->tok_pos[tok_idx];
278 cur_len = exp->tok_len[tok_idx];
279 if (prefix == LY_PATH_PREFIX_MANDATORY) {
280 if (!strnstr(cur_node, ":", cur_len)) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100281 LOGVAL(ctx, LYVE_XPATH, "Prefix missing for \"%.*s\" in path.", cur_len, cur_node);
Radek Krejcif03a9e22020-09-18 20:09:31 +0200282 ret = LY_EVALID;
Michal Vasko8b06a5e2020-08-06 12:13:08 +0200283 goto error;
284 }
285 } else if (prefix == LY_PATH_PREFIX_STRICT_INHERIT) {
286 if (!prev_prefix) {
287 /* the first node must have a prefix */
288 if (!strnstr(cur_node, ":", cur_len)) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100289 LOGVAL(ctx, LYVE_XPATH, "Prefix missing for \"%.*s\" in path.", cur_len, cur_node);
Radek Krejcif03a9e22020-09-18 20:09:31 +0200290 ret = LY_EVALID;
Michal Vasko8b06a5e2020-08-06 12:13:08 +0200291 goto error;
292 }
293
294 /* remember the first prefix */
295 prev_prefix = cur_node;
296 } else {
297 /* the prefix must be different, if any */
298 ptr = strnstr(cur_node, ":", cur_len);
299 if (ptr) {
300 if (!strncmp(prev_prefix, cur_node, ptr - cur_node) && (prev_prefix[ptr - cur_node] == ':')) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100301 LOGVAL(ctx, LYVE_XPATH, "Duplicate prefix for \"%.*s\" in path.", cur_len, cur_node);
Radek Krejcif03a9e22020-09-18 20:09:31 +0200302 ret = LY_EVALID;
Michal Vasko8b06a5e2020-08-06 12:13:08 +0200303 goto error;
304 }
305
306 /* remember this next prefix */
307 prev_prefix = cur_node;
308 }
309 }
Michal Vasko004d3152020-06-11 19:59:22 +0200310 }
311
312 ++tok_idx;
313
314 /* Predicate* */
Radek Krejcif03a9e22020-09-18 20:09:31 +0200315 LY_CHECK_GOTO(ret = ly_path_check_predicate(ctx, ctx_node, exp, &tok_idx, prefix, pred), error);
Michal Vasko004d3152020-06-11 19:59:22 +0200316
Radek Krejci0f969882020-08-21 16:56:47 +0200317 /* '/' */
Michal Vasko004d3152020-06-11 19:59:22 +0200318 } while (!lyxp_next_token(NULL, exp, &tok_idx, LYXP_TOKEN_OPER_PATH));
319
320 /* trailing token check */
321 if (exp->used > tok_idx) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100322 LOGVAL(ctx, LYVE_XPATH, "Unparsed characters \"%s\" left at the end of path.", exp->expr + exp->tok_pos[tok_idx]);
Radek Krejcif03a9e22020-09-18 20:09:31 +0200323 ret = LY_EVALID;
Michal Vasko004d3152020-06-11 19:59:22 +0200324 goto error;
325 }
326
327 *expr = exp;
Radek Krejci2efc45b2020-12-22 16:25:44 +0100328
Radek Krejciddace2c2021-01-08 11:30:56 +0100329 LOG_LOCBACK(ctx_node ? 1 : 0, 0, 0, 0);
Michal Vasko004d3152020-06-11 19:59:22 +0200330 return LY_SUCCESS;
331
332error:
333 lyxp_expr_free(ctx, exp);
Radek Krejciddace2c2021-01-08 11:30:56 +0100334 LOG_LOCBACK(ctx_node ? 1 : 0, 0, 0, 0);
Radek Krejcif03a9e22020-09-18 20:09:31 +0200335 return ret;
Michal Vasko004d3152020-06-11 19:59:22 +0200336}
337
338LY_ERR
Michal Vasko6b26e742020-07-17 15:02:10 +0200339ly_path_parse_predicate(const struct ly_ctx *ctx, const struct lysc_node *cur_node, const char *str_path,
Radek Krejci0f969882020-08-21 16:56:47 +0200340 size_t path_len, uint8_t prefix, uint8_t pred, struct lyxp_expr **expr)
Michal Vasko004d3152020-06-11 19:59:22 +0200341{
Radek Krejcif03a9e22020-09-18 20:09:31 +0200342 LY_ERR ret = LY_SUCCESS;
343 struct lyxp_expr *exp = NULL;
Michal Vasko004d3152020-06-11 19:59:22 +0200344 uint16_t tok_idx;
345
346 assert((prefix == LY_PATH_PREFIX_OPTIONAL) || (prefix == LY_PATH_PREFIX_MANDATORY));
347 assert((pred == LY_PATH_PRED_KEYS) || (pred == LY_PATH_PRED_SIMPLE) || (pred == LY_PATH_PRED_LEAFREF));
348
Radek Krejciddace2c2021-01-08 11:30:56 +0100349 LOG_LOCSET(cur_node, NULL, NULL, NULL);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100350
Michal Vasko004d3152020-06-11 19:59:22 +0200351 /* parse as a generic XPath expression */
Radek Krejcif03a9e22020-09-18 20:09:31 +0200352 LY_CHECK_GOTO(ret = lyxp_expr_parse(ctx, str_path, path_len, 0, &exp), error);
Michal Vasko004d3152020-06-11 19:59:22 +0200353 tok_idx = 0;
354
Radek Krejcif03a9e22020-09-18 20:09:31 +0200355 LY_CHECK_GOTO(ret = ly_path_check_predicate(ctx, cur_node, exp, &tok_idx, prefix, pred), error);
Michal Vasko004d3152020-06-11 19:59:22 +0200356
357 /* trailing token check */
358 if (exp->used > tok_idx) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100359 LOGVAL(ctx, LYVE_XPATH, "Unparsed characters \"%s\" left at the end of predicate.",
Michal Vasko69730152020-10-09 16:30:07 +0200360 exp->expr + exp->tok_pos[tok_idx]);
Radek Krejcif03a9e22020-09-18 20:09:31 +0200361 ret = LY_EVALID;
Michal Vasko004d3152020-06-11 19:59:22 +0200362 goto error;
363 }
364
365 *expr = exp;
Radek Krejci2efc45b2020-12-22 16:25:44 +0100366
Radek Krejciddace2c2021-01-08 11:30:56 +0100367 LOG_LOCBACK(cur_node ? 1 : 0, 0, 0, 0);
Michal Vasko004d3152020-06-11 19:59:22 +0200368 return LY_SUCCESS;
369
370error:
371 lyxp_expr_free(ctx, exp);
Radek Krejciddace2c2021-01-08 11:30:56 +0100372 LOG_LOCBACK(cur_node ? 1 : 0, 0, 0, 0);
Radek Krejcif03a9e22020-09-18 20:09:31 +0200373 return ret;
Michal Vasko004d3152020-06-11 19:59:22 +0200374}
375
376/**
Michal Vasko8cc3f662022-03-29 11:25:51 +0200377 * @brief Parse NameTest and get the corresponding schema node.
Michal Vasko004d3152020-06-11 19:59:22 +0200378 *
Michal Vasko00cbf532020-06-15 13:58:47 +0200379 * @param[in] ctx libyang context.
Michal Vasko6b26e742020-07-17 15:02:10 +0200380 * @param[in] cur_node Optional current (original context) node.
Radek Krejci84d7fd72021-07-14 18:32:21 +0200381 * @param[in] cur_mod Current module of the path (where the path is "instantiated"). Needed for ::LY_VALUE_SCHEMA
382 * and ::LY_VALUE_SCHEMA_RESOLVED.
Michal Vasko8cc3f662022-03-29 11:25:51 +0200383 * @param[in] prev_ctx_node Previous context node.
Michal Vasko004d3152020-06-11 19:59:22 +0200384 * @param[in] expr Parsed path.
385 * @param[in] tok_idx Index in @p expr.
Michal Vasko004d3152020-06-11 19:59:22 +0200386 * @param[in] format Format of the path.
Michal Vaskoc8a230d2020-08-14 12:17:10 +0200387 * @param[in] prefix_data Format-specific data for resolving any prefixes (see ::ly_resolve_prefix).
Michal Vasko8cc3f662022-03-29 11:25:51 +0200388 * @param[in] top_ext Optional top-level extension to use for searching the schema node.
389 * @param[in] getnext_opts Options to be used for ::lys_getnext() calls.
390 * @param[out] snode Resolved schema node.
391 * @param[out] ext Optional extension instance of @p snode, if any.
Michal Vasko004d3152020-06-11 19:59:22 +0200392 * @return LY_ERR value.
393 */
394static LY_ERR
Michal Vasko8cc3f662022-03-29 11:25:51 +0200395ly_path_compile_snode(const struct ly_ctx *ctx, const struct lysc_node *cur_node, const struct lys_module *cur_mod,
Michal Vaskoed725d72021-06-23 12:03:45 +0200396 const struct lysc_node *prev_ctx_node, const struct lyxp_expr *expr, uint16_t tok_idx, LY_VALUE_FORMAT format,
Michal Vasko8cc3f662022-03-29 11:25:51 +0200397 void *prefix_data, const struct lysc_ext_instance *top_ext, uint32_t getnext_opts, const struct lysc_node **snode,
398 struct lysc_ext_instance **ext)
Michal Vasko004d3152020-06-11 19:59:22 +0200399{
Radek Krejci2efc45b2020-12-22 16:25:44 +0100400 LY_ERR ret;
Michal Vasko8cc3f662022-03-29 11:25:51 +0200401 const struct lys_module *mod = NULL;
402 struct lysc_ext_instance *e = NULL;
403 const char *pref, *name;
404 size_t len, name_len;
Michal Vasko004d3152020-06-11 19:59:22 +0200405
406 assert(expr->tokens[tok_idx] == LYXP_TOKEN_NAMETEST);
407
Michal Vasko8cc3f662022-03-29 11:25:51 +0200408 *snode = NULL;
409 if (ext) {
410 *ext = NULL;
411 }
412
Michal Vasko004d3152020-06-11 19:59:22 +0200413 /* get prefix */
Michal Vasko5d24f6c2020-10-13 13:49:06 +0200414 if ((pref = strnstr(expr->expr + expr->tok_pos[tok_idx], ":", expr->tok_len[tok_idx]))) {
415 len = pref - (expr->expr + expr->tok_pos[tok_idx]);
416 pref = expr->expr + expr->tok_pos[tok_idx];
417 } else {
418 len = 0;
419 }
Michal Vasko004d3152020-06-11 19:59:22 +0200420
Michal Vasko8cc3f662022-03-29 11:25:51 +0200421 /* set name */
422 if (pref) {
423 name = pref + len + 1;
424 name_len = expr->tok_len[tok_idx] - len - 1;
425 } else {
426 name = expr->expr + expr->tok_pos[tok_idx];
427 name_len = expr->tok_len[tok_idx];
428 }
429
430 /* find node module */
Michal Vasko5d24f6c2020-10-13 13:49:06 +0200431 if (pref) {
Radek Krejciddace2c2021-01-08 11:30:56 +0100432 LOG_LOCSET(cur_node, NULL, NULL, NULL);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100433
Michal Vasko8cc3f662022-03-29 11:25:51 +0200434 mod = ly_resolve_prefix(ctx, pref, len, format, prefix_data);
435 if ((!mod || !mod->implemented) && prev_ctx_node) {
436 /* check for nested ext data */
437 ret = ly_nested_ext_schema(NULL, prev_ctx_node, pref, len, format, prefix_data, name, name_len, snode, &e);
438 if (!ret) {
439 goto success;
440 } else if (ret != LY_ENOT) {
441 goto error;
442 }
443 }
444
445 if (!mod) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100446 LOGVAL(ctx, LYVE_XPATH, "No module connected with the prefix \"%.*s\" found (prefix format %s).",
Radek Krejci422afb12021-03-04 16:38:16 +0100447 (int)len, pref, ly_format2str(format));
Michal Vasko825a0442021-04-16 16:11:53 +0200448 ret = LY_EVALID;
Radek Krejci2efc45b2020-12-22 16:25:44 +0100449 goto error;
Michal Vasko8cc3f662022-03-29 11:25:51 +0200450 } else if (!mod->implemented) {
451 LOGVAL(ctx, LYVE_XPATH, "Not implemented module \"%s\" in path.", mod->name);
Michal Vaskoed725d72021-06-23 12:03:45 +0200452 ret = LY_EVALID;
453 goto error;
Michal Vasko004d3152020-06-11 19:59:22 +0200454 }
Radek Krejci2efc45b2020-12-22 16:25:44 +0100455
Radek Krejciddace2c2021-01-08 11:30:56 +0100456 LOG_LOCBACK(cur_node ? 1 : 0, 0, 0, 0);
Michal Vasko004d3152020-06-11 19:59:22 +0200457 } else {
458 switch (format) {
Radek Krejci8df109d2021-04-23 12:19:08 +0200459 case LY_VALUE_SCHEMA:
460 case LY_VALUE_SCHEMA_RESOLVED:
Michal Vasko5d24f6c2020-10-13 13:49:06 +0200461 if (!cur_mod) {
462 LOGINT_RET(ctx);
463 }
464 /* use current module */
Michal Vasko8cc3f662022-03-29 11:25:51 +0200465 mod = cur_mod;
Michal Vasko004d3152020-06-11 19:59:22 +0200466 break;
Radek Krejci8df109d2021-04-23 12:19:08 +0200467 case LY_VALUE_JSON:
Michal Vasko79228af2021-08-26 14:44:28 +0200468 case LY_VALUE_LYB:
Michal Vasko004d3152020-06-11 19:59:22 +0200469 if (!prev_ctx_node) {
Michal Vasko00cbf532020-06-15 13:58:47 +0200470 LOGINT_RET(ctx);
Michal Vasko004d3152020-06-11 19:59:22 +0200471 }
Michal Vasko5d24f6c2020-10-13 13:49:06 +0200472 /* inherit module of the previous node */
Michal Vasko8cc3f662022-03-29 11:25:51 +0200473 mod = prev_ctx_node->module;
Michal Vasko004d3152020-06-11 19:59:22 +0200474 break;
Radek Krejci224d4b42021-04-23 13:54:59 +0200475 case LY_VALUE_CANON:
Radek Krejci8df109d2021-04-23 12:19:08 +0200476 case LY_VALUE_XML:
Michal Vaskoddd76592022-01-17 13:34:48 +0100477 case LY_VALUE_STR_NS:
Radek Krejcif9943642021-04-26 10:18:21 +0200478 /* not really defined or accepted */
Michal Vasko00cbf532020-06-15 13:58:47 +0200479 LOGINT_RET(ctx);
Michal Vasko004d3152020-06-11 19:59:22 +0200480 }
481 }
482
Michal Vasko8cc3f662022-03-29 11:25:51 +0200483 /* find schema node */
484 if (!prev_ctx_node && top_ext) {
485 *snode = lysc_ext_find_node(top_ext, mod, name, name_len, 0, getnext_opts);
Michal Vasko004d3152020-06-11 19:59:22 +0200486 } else {
Michal Vasko8cc3f662022-03-29 11:25:51 +0200487 *snode = lys_find_child(prev_ctx_node, mod, name, name_len, 0, getnext_opts);
488 if (!(*snode) && prev_ctx_node) {
489 ret = ly_nested_ext_schema(NULL, prev_ctx_node, pref, len, format, prefix_data, name, name_len, snode, &e);
490 LY_CHECK_RET(ret && (ret != LY_ENOT), ret);
491 }
492 }
493 if (!(*snode)) {
494 LOGVAL(ctx, LYVE_XPATH, "Not found node \"%.*s\" in path.", (int)name_len, name);
495 return LY_ENOTFOUND;
Michal Vasko004d3152020-06-11 19:59:22 +0200496 }
497
Michal Vasko8cc3f662022-03-29 11:25:51 +0200498success:
499 if (ext) {
500 *ext = e;
501 }
Michal Vasko004d3152020-06-11 19:59:22 +0200502 return LY_SUCCESS;
Radek Krejci2efc45b2020-12-22 16:25:44 +0100503
504error:
Radek Krejciddace2c2021-01-08 11:30:56 +0100505 LOG_LOCBACK(cur_node ? 1 : 0, 0, 0, 0);
Michal Vasko825a0442021-04-16 16:11:53 +0200506 return ret;
Michal Vasko004d3152020-06-11 19:59:22 +0200507}
508
509LY_ERR
Michal Vasko6b26e742020-07-17 15:02:10 +0200510ly_path_compile_predicate(const struct ly_ctx *ctx, const struct lysc_node *cur_node, const struct lys_module *cur_mod,
Radek Krejci8df109d2021-04-23 12:19:08 +0200511 const struct lysc_node *ctx_node, const struct lyxp_expr *expr, uint16_t *tok_idx, LY_VALUE_FORMAT format,
Michal Vasko5d24f6c2020-10-13 13:49:06 +0200512 void *prefix_data, struct ly_path_predicate **predicates, enum ly_path_pred_type *pred_type)
Michal Vasko004d3152020-06-11 19:59:22 +0200513{
Radek Krejci2efc45b2020-12-22 16:25:44 +0100514 LY_ERR ret = LY_SUCCESS;
Michal Vasko004d3152020-06-11 19:59:22 +0200515 struct ly_path_predicate *p;
516 const struct lysc_node *key;
Michal Vasko8cc3f662022-03-29 11:25:51 +0200517 const char *val;
518 size_t val_len, key_count;
Michal Vasko004d3152020-06-11 19:59:22 +0200519
Michal Vasko00cbf532020-06-15 13:58:47 +0200520 assert(ctx && ctx_node);
521
Radek Krejciddace2c2021-01-08 11:30:56 +0100522 LOG_LOCSET(cur_node, NULL, NULL, NULL);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100523
Michal Vasko004d3152020-06-11 19:59:22 +0200524 *pred_type = 0;
525
Michal Vasko004d3152020-06-11 19:59:22 +0200526 if (lyxp_next_token(NULL, expr, tok_idx, LYXP_TOKEN_BRACK1)) {
Radek Krejcif6a11002020-08-21 13:29:07 +0200527 /* '[', no predicate */
Radek Krejci2efc45b2020-12-22 16:25:44 +0100528 goto cleanup; /* LY_SUCCESS */
Michal Vasko004d3152020-06-11 19:59:22 +0200529 }
530
531 if (expr->tokens[*tok_idx] == LYXP_TOKEN_NAMETEST) {
532 if (ctx_node->nodetype != LYS_LIST) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100533 LOGVAL(ctx, LYVE_XPATH, "List predicate defined for %s \"%s\" in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200534 lys_nodetype2str(ctx_node->nodetype), ctx_node->name);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100535 ret = LY_EVALID;
536 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200537 } else if (ctx_node->flags & LYS_KEYLESS) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100538 LOGVAL(ctx, LYVE_XPATH, "List predicate defined for keyless %s \"%s\" in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200539 lys_nodetype2str(ctx_node->nodetype), ctx_node->name);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100540 ret = LY_EVALID;
541 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200542 }
543
544 do {
545 /* NameTest, find the key */
Michal Vasko8cc3f662022-03-29 11:25:51 +0200546 LY_CHECK_RET(ly_path_compile_snode(ctx, cur_node, cur_mod, ctx_node, expr, *tok_idx, format, prefix_data,
547 NULL, 0, &key, NULL));
548 if ((key->nodetype != LYS_LEAF) || !(key->flags & LYS_KEY)) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100549 LOGVAL(ctx, LYVE_XPATH, "Key expected instead of %s \"%s\" in path.", lys_nodetype2str(key->nodetype),
550 key->name);
551 ret = LY_EVALID;
552 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200553 }
554 ++(*tok_idx);
555
Michal Vasko004d3152020-06-11 19:59:22 +0200556 if (!*pred_type) {
Radek Krejcif6a11002020-08-21 13:29:07 +0200557 /* new predicate */
Michal Vasko004d3152020-06-11 19:59:22 +0200558 *pred_type = LY_PATH_PREDTYPE_LIST;
559 }
560 assert(*pred_type == LY_PATH_PREDTYPE_LIST);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100561 LY_ARRAY_NEW_GOTO(ctx, *predicates, p, ret, cleanup);
Michal Vasko004d3152020-06-11 19:59:22 +0200562 p->key = key;
563
564 /* '=' */
565 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_OPER_EQUAL);
566 ++(*tok_idx);
567
Michal Vasko4911eeb2021-06-28 11:23:05 +0200568 /* Literal or Number */
569 assert((expr->tokens[*tok_idx] == LYXP_TOKEN_LITERAL) || (expr->tokens[*tok_idx] == LYXP_TOKEN_NUMBER));
570 if (expr->tokens[*tok_idx] == LYXP_TOKEN_LITERAL) {
571 /* skip quotes */
572 val = expr->expr + expr->tok_pos[*tok_idx] + 1;
573 val_len = expr->tok_len[*tok_idx] - 2;
574 } else {
575 val = expr->expr + expr->tok_pos[*tok_idx];
576 val_len = expr->tok_len[*tok_idx];
577 }
578
579 /* store the value */
Radek Krejciddace2c2021-01-08 11:30:56 +0100580 LOG_LOCSET(key, NULL, NULL, NULL);
Michal Vasko4911eeb2021-06-28 11:23:05 +0200581 ret = lyd_value_store(ctx, &p->value, ((struct lysc_node_leaf *)key)->type, val, val_len, NULL, format,
582 prefix_data, LYD_HINT_DATA, key, NULL);
Radek Krejciddace2c2021-01-08 11:30:56 +0100583 LOG_LOCBACK(key ? 1 : 0, 0, 0, 0);
Michal Vasko55b84812021-05-11 09:23:58 +0200584 LY_CHECK_ERR_GOTO(ret, p->value.realtype = NULL, cleanup);
Michal Vasko004d3152020-06-11 19:59:22 +0200585 ++(*tok_idx);
586
Michal Vaskoae875662020-10-21 10:33:17 +0200587 /* "allocate" the type to avoid problems when freeing the value after the type was freed */
Michal Vasko04338d92021-09-01 07:58:14 +0200588 LY_ATOMIC_INC_BARRIER(((struct lysc_type *)p->value.realtype)->refcount);
Michal Vaskoae875662020-10-21 10:33:17 +0200589
Michal Vasko004d3152020-06-11 19:59:22 +0200590 /* ']' */
591 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_BRACK2);
592 ++(*tok_idx);
593
594 /* another predicate follows? */
595 } while (!lyxp_next_token(NULL, expr, tok_idx, LYXP_TOKEN_BRACK1));
596
597 /* check that all keys were set */
598 key_count = 0;
Michal Vasko544e58a2021-01-28 14:33:41 +0100599 for (key = lysc_node_child(ctx_node); key && (key->flags & LYS_KEY); key = key->next) {
Michal Vasko004d3152020-06-11 19:59:22 +0200600 ++key_count;
601 }
Michal Vaskofd69e1d2020-07-03 11:57:17 +0200602 if (LY_ARRAY_COUNT(*predicates) != key_count) {
Michal Vasko004d3152020-06-11 19:59:22 +0200603 /* names (keys) are unique - it was checked when parsing */
Radek Krejci2efc45b2020-12-22 16:25:44 +0100604 LOGVAL(ctx, LYVE_XPATH, "Predicate missing for a key of %s \"%s\" in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200605 lys_nodetype2str(ctx_node->nodetype), ctx_node->name);
Michal Vaskof7e16e22020-10-21 09:24:39 +0200606 ly_path_predicates_free(ctx, LY_PATH_PREDTYPE_LIST, *predicates);
Michal Vasko004d3152020-06-11 19:59:22 +0200607 *predicates = NULL;
Radek Krejci2efc45b2020-12-22 16:25:44 +0100608 ret = LY_EVALID;
609 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200610 }
611
612 } else if (expr->tokens[*tok_idx] == LYXP_TOKEN_DOT) {
613 if (ctx_node->nodetype != LYS_LEAFLIST) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100614 LOGVAL(ctx, LYVE_XPATH, "Leaf-list predicate defined for %s \"%s\" in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200615 lys_nodetype2str(ctx_node->nodetype), ctx_node->name);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100616 ret = LY_EVALID;
617 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200618 }
619 ++(*tok_idx);
620
621 /* new predicate */
622 *pred_type = LY_PATH_PREDTYPE_LEAFLIST;
Radek Krejci2efc45b2020-12-22 16:25:44 +0100623 LY_ARRAY_NEW_GOTO(ctx, *predicates, p, ret, cleanup);
Michal Vasko004d3152020-06-11 19:59:22 +0200624
625 /* '=' */
626 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_OPER_EQUAL);
627 ++(*tok_idx);
628
Michal Vasko4911eeb2021-06-28 11:23:05 +0200629 /* Literal or Number */
630 assert((expr->tokens[*tok_idx] == LYXP_TOKEN_LITERAL) || (expr->tokens[*tok_idx] == LYXP_TOKEN_NUMBER));
631 if (expr->tokens[*tok_idx] == LYXP_TOKEN_LITERAL) {
632 /* skip quotes */
633 val = expr->expr + expr->tok_pos[*tok_idx] + 1;
634 val_len = expr->tok_len[*tok_idx] - 2;
635 } else {
636 val = expr->expr + expr->tok_pos[*tok_idx];
637 val_len = expr->tok_len[*tok_idx];
638 }
639
Michal Vasko004d3152020-06-11 19:59:22 +0200640 /* store the value */
Radek Krejciddace2c2021-01-08 11:30:56 +0100641 LOG_LOCSET(ctx_node, NULL, NULL, NULL);
Michal Vasko4911eeb2021-06-28 11:23:05 +0200642 ret = lyd_value_store(ctx, &p->value, ((struct lysc_node_leaflist *)ctx_node)->type, val, val_len, NULL, format,
643 prefix_data, LYD_HINT_DATA, ctx_node, NULL);
Radek Krejciddace2c2021-01-08 11:30:56 +0100644 LOG_LOCBACK(ctx_node ? 1 : 0, 0, 0, 0);
Michal Vasko55b84812021-05-11 09:23:58 +0200645 LY_CHECK_ERR_GOTO(ret, p->value.realtype = NULL, cleanup);
Michal Vasko004d3152020-06-11 19:59:22 +0200646 ++(*tok_idx);
647
Michal Vaskoae875662020-10-21 10:33:17 +0200648 /* "allocate" the type to avoid problems when freeing the value after the type was freed */
Michal Vasko04338d92021-09-01 07:58:14 +0200649 LY_ATOMIC_INC_BARRIER(((struct lysc_type *)p->value.realtype)->refcount);
Michal Vaskoae875662020-10-21 10:33:17 +0200650
Michal Vasko004d3152020-06-11 19:59:22 +0200651 /* ']' */
652 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_BRACK2);
653 ++(*tok_idx);
654 } else {
655 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_NUMBER);
656 if (!(ctx_node->nodetype & (LYS_LEAFLIST | LYS_LIST))) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100657 ret = LY_EVALID;
658 LOGVAL(ctx, LYVE_XPATH, "Positional predicate defined for %s \"%s\" in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200659 lys_nodetype2str(ctx_node->nodetype), ctx_node->name);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100660 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200661 } else if (ctx_node->flags & LYS_CONFIG_W) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100662 ret = LY_EVALID;
663 LOGVAL(ctx, LYVE_XPATH, "Positional predicate defined for configuration %s \"%s\" in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200664 lys_nodetype2str(ctx_node->nodetype), ctx_node->name);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100665 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200666 }
Michal Vasko004d3152020-06-11 19:59:22 +0200667
668 /* new predicate */
669 *pred_type = LY_PATH_PREDTYPE_POSITION;
Radek Krejci2efc45b2020-12-22 16:25:44 +0100670 LY_ARRAY_NEW_GOTO(ctx, *predicates, p, ret, cleanup);
Michal Vasko004d3152020-06-11 19:59:22 +0200671
672 /* syntax was already checked */
Michal Vasko8cc3f662022-03-29 11:25:51 +0200673 p->position = strtoull(expr->expr + expr->tok_pos[*tok_idx], (char **)&val, LY_BASE_DEC);
Michal Vasko00cbf532020-06-15 13:58:47 +0200674 ++(*tok_idx);
Michal Vasko004d3152020-06-11 19:59:22 +0200675
676 /* ']' */
677 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_BRACK2);
678 ++(*tok_idx);
679 }
680
Radek Krejci2efc45b2020-12-22 16:25:44 +0100681cleanup:
Radek Krejciddace2c2021-01-08 11:30:56 +0100682 LOG_LOCBACK(cur_node ? 1 : 0, 0, 0, 0);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100683 return ret;
Michal Vasko004d3152020-06-11 19:59:22 +0200684}
685
686/**
687 * @brief Compile leafref predicate. Actually, it is only checked.
688 *
689 * @param[in] ctx_node Context node, node for which the predicate is defined.
690 * @param[in] cur_node Current (original context) node.
691 * @param[in] expr Parsed path.
692 * @param[in,out] tok_idx Index in @p expr, is adjusted for parsed tokens.
Michal Vasko004d3152020-06-11 19:59:22 +0200693 * @param[in] format Format of the path.
Michal Vaskoc8a230d2020-08-14 12:17:10 +0200694 * @param[in] prefix_data Format-specific data for resolving any prefixes (see ::ly_resolve_prefix).
Michal Vasko004d3152020-06-11 19:59:22 +0200695 * @return LY_ERR value.
696 */
697static LY_ERR
698ly_path_compile_predicate_leafref(const struct lysc_node *ctx_node, const struct lysc_node *cur_node,
Michal Vasko24fc4d12021-07-12 14:41:20 +0200699 const struct lyxp_expr *expr, uint16_t *tok_idx, LY_VALUE_FORMAT format, void *prefix_data)
Michal Vasko004d3152020-06-11 19:59:22 +0200700{
Radek Krejci2efc45b2020-12-22 16:25:44 +0100701 LY_ERR ret = LY_SUCCESS;
Michal Vasko004d3152020-06-11 19:59:22 +0200702 const struct lysc_node *key, *node, *node2;
Radek Krejci2efc45b2020-12-22 16:25:44 +0100703 struct ly_ctx *ctx = cur_node->module->ctx;
704
Radek Krejciddace2c2021-01-08 11:30:56 +0100705 LOG_LOCSET(cur_node, NULL, NULL, NULL);
Michal Vasko004d3152020-06-11 19:59:22 +0200706
Michal Vasko004d3152020-06-11 19:59:22 +0200707 if (lyxp_next_token(NULL, expr, tok_idx, LYXP_TOKEN_BRACK1)) {
Radek Krejcif6a11002020-08-21 13:29:07 +0200708 /* '[', no predicate */
Radek Krejci2efc45b2020-12-22 16:25:44 +0100709 goto cleanup; /* LY_SUCCESS */
Michal Vasko004d3152020-06-11 19:59:22 +0200710 }
711
712 if (ctx_node->nodetype != LYS_LIST) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100713 LOGVAL(ctx, LYVE_XPATH, "List predicate defined for %s \"%s\" in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200714 lys_nodetype2str(ctx_node->nodetype), ctx_node->name);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100715 ret = LY_EVALID;
716 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200717 } else if (ctx_node->flags & LYS_KEYLESS) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100718 LOGVAL(ctx, LYVE_XPATH, "List predicate defined for keyless %s \"%s\" in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200719 lys_nodetype2str(ctx_node->nodetype), ctx_node->name);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100720 ret = LY_EVALID;
721 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200722 }
723
724 do {
725 /* NameTest, find the key */
Michal Vasko8cc3f662022-03-29 11:25:51 +0200726 ret = ly_path_compile_snode(ctx, cur_node, cur_node->module, ctx_node, expr, *tok_idx, format, prefix_data,
727 NULL, 0, &key, NULL);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100728 LY_CHECK_GOTO(ret, cleanup);
Michal Vasko8cc3f662022-03-29 11:25:51 +0200729 if ((key->nodetype != LYS_LEAF) || !(key->flags & LYS_KEY)) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100730 LOGVAL(ctx, LYVE_XPATH, "Key expected instead of %s \"%s\" in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200731 lys_nodetype2str(key->nodetype), key->name);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100732 ret = LY_EVALID;
733 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200734 }
735 ++(*tok_idx);
736
737 /* we are not actually compiling, throw the key away */
738 (void)key;
739
740 /* '=' */
741 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_OPER_EQUAL);
742 ++(*tok_idx);
743
744 /* FuncName */
745 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_FUNCNAME);
746 ++(*tok_idx);
747
748 /* evaluating from the "current()" node */
749 node = cur_node;
750
751 /* '(' */
752 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_PAR1);
753 ++(*tok_idx);
754
755 /* ')' */
756 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_PAR2);
757 ++(*tok_idx);
758
759 do {
760 /* '/' */
761 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_OPER_PATH);
762 ++(*tok_idx);
763
764 /* go to parent */
765 if (!node) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100766 LOGVAL(ctx, LYVE_XPATH, "Too many parent references in path.");
767 ret = LY_EVALID;
768 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200769 }
770 node = lysc_data_parent(node);
771
772 /* '..' */
773 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_DDOT);
774 ++(*tok_idx);
775 } while (expr->tokens[*tok_idx + 1] == LYXP_TOKEN_DDOT);
776
777 do {
778 /* '/' */
779 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_OPER_PATH);
780 ++(*tok_idx);
781
782 /* NameTest */
783 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_NAMETEST);
Michal Vasko8cc3f662022-03-29 11:25:51 +0200784 LY_CHECK_RET(ly_path_compile_snode(ctx, cur_node, cur_node->module, node, expr, *tok_idx, format,
785 prefix_data, NULL, 0, &node2, NULL));
Michal Vasko004d3152020-06-11 19:59:22 +0200786 node = node2;
787 ++(*tok_idx);
788 } while ((*tok_idx + 1 < expr->used) && (expr->tokens[*tok_idx + 1] == LYXP_TOKEN_NAMETEST));
789
790 /* check the last target node */
791 if (node->nodetype != LYS_LEAF) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100792 LOGVAL(ctx, LYVE_XPATH, "Leaf expected instead of %s \"%s\" in leafref predicate in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200793 lys_nodetype2str(node->nodetype), node->name);
Radek Krejci2efc45b2020-12-22 16:25:44 +0100794 ret = LY_EVALID;
795 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200796 }
797
798 /* we are not actually compiling, throw the rightside node away */
799 (void)node;
800
801 /* ']' */
802 assert(expr->tokens[*tok_idx] == LYXP_TOKEN_BRACK2);
803 ++(*tok_idx);
804
Radek Krejci0f969882020-08-21 16:56:47 +0200805 /* another predicate follows? */
Michal Vasko004d3152020-06-11 19:59:22 +0200806 } while (!lyxp_next_token(NULL, expr, tok_idx, LYXP_TOKEN_BRACK1));
807
Radek Krejci2efc45b2020-12-22 16:25:44 +0100808cleanup:
Radek Krejciddace2c2021-01-08 11:30:56 +0100809 LOG_LOCBACK(1, 0, 0, 0);
Michal Vasko8cc3f662022-03-29 11:25:51 +0200810 return (ret == LY_ENOTFOUND) ? LY_EVALID : ret;
Michal Vasko004d3152020-06-11 19:59:22 +0200811}
812
Michal Vaskoed725d72021-06-23 12:03:45 +0200813/**
814 * @brief Compile path into ly_path structure. Any predicates of a leafref are only checked, not compiled.
815 *
816 * @param[in] ctx libyang context.
817 * @param[in] cur_mod Current module of the path (where it was "instantiated"), ignored of @p lref. Used for nodes
Radek Krejci84d7fd72021-07-14 18:32:21 +0200818 * without a prefix for ::LY_VALUE_SCHEMA and ::LY_VALUE_SCHEMA_RESOLVED format.
Michal Vaskoed725d72021-06-23 12:03:45 +0200819 * @param[in] ctx_node Optional context node, mandatory of @p lref.
Michal Vasko8cc3f662022-03-29 11:25:51 +0200820 * @param[in] top_ext Extension instance containing the definition of the data being created. It is used to find the top-level
Michal Vaskoed725d72021-06-23 12:03:45 +0200821 * node inside the extension instance instead of a module. Note that this is the case not only if the @p ctx_node is NULL,
822 * but also if the relative path starting in @p ctx_node reaches the document root via double dots.
823 * @param[in] expr Parsed path.
824 * @param[in] lref Whether leafref is being compiled or not.
825 * @param[in] oper Oper option (@ref path_oper_options).
826 * @param[in] target Target option (@ref path_target_options).
Michal Vasko0884d212021-10-14 09:21:46 +0200827 * @param[in] limit_access_tree Whether to limit accessible tree as described in
828 * [XPath context](https://datatracker.ietf.org/doc/html/rfc7950#section-6.4.1).
Michal Vaskoed725d72021-06-23 12:03:45 +0200829 * @param[in] format Format of the path.
830 * @param[in] prefix_data Format-specific data for resolving any prefixes (see ::ly_resolve_prefix).
Michal Vaskoed725d72021-06-23 12:03:45 +0200831 * @param[out] path Compiled path.
832 * @return LY_ERECOMPILE, only if @p lref.
833 * @return LY_ERR value.
834 */
835static LY_ERR
836_ly_path_compile(const struct ly_ctx *ctx, const struct lys_module *cur_mod, const struct lysc_node *ctx_node,
Michal Vasko8cc3f662022-03-29 11:25:51 +0200837 const struct lysc_ext_instance *top_ext, const struct lyxp_expr *expr, ly_bool lref, uint8_t oper, uint8_t target,
Michal Vasko0884d212021-10-14 09:21:46 +0200838 ly_bool limit_access_tree, LY_VALUE_FORMAT format, void *prefix_data, struct ly_path **path)
Michal Vasko004d3152020-06-11 19:59:22 +0200839{
840 LY_ERR ret = LY_SUCCESS;
841 uint16_t tok_idx = 0;
Michal Vasko6b26e742020-07-17 15:02:10 +0200842 const struct lysc_node *node2, *cur_node, *op;
Michal Vasko00cbf532020-06-15 13:58:47 +0200843 struct ly_path *p = NULL;
Michal Vasko8cc3f662022-03-29 11:25:51 +0200844 struct lysc_ext_instance *ext = NULL;
Radek Krejci1deb5be2020-08-26 16:43:36 +0200845 uint32_t getnext_opts;
Michal Vasko004d3152020-06-11 19:59:22 +0200846
Michal Vasko00cbf532020-06-15 13:58:47 +0200847 assert(ctx);
Michal Vaskoed725d72021-06-23 12:03:45 +0200848 assert(!lref || ctx_node);
Michal Vasko00cbf532020-06-15 13:58:47 +0200849 assert((oper == LY_PATH_OPER_INPUT) || (oper == LY_PATH_OPER_OUTPUT));
850 assert((target == LY_PATH_TARGET_SINGLE) || (target == LY_PATH_TARGET_MANY));
Michal Vasko004d3152020-06-11 19:59:22 +0200851
Michal Vasko0884d212021-10-14 09:21:46 +0200852 if (!limit_access_tree) {
853 op = NULL;
854 } else {
855 /* find operation, if we are in any */
856 for (op = ctx_node; op && !(op->nodetype & (LYS_RPC | LYS_ACTION | LYS_NOTIF)); op = op->parent) {}
857 }
Michal Vasko6b26e742020-07-17 15:02:10 +0200858
Radek Krejci2efc45b2020-12-22 16:25:44 +0100859 *path = NULL;
860
Michal Vasko6b26e742020-07-17 15:02:10 +0200861 /* remember original context node */
862 cur_node = ctx_node;
Radek Krejciddace2c2021-01-08 11:30:56 +0100863 LOG_LOCINIT(cur_node, NULL, NULL, NULL);
Michal Vasko004d3152020-06-11 19:59:22 +0200864
Michal Vasko00cbf532020-06-15 13:58:47 +0200865 if (oper == LY_PATH_OPER_OUTPUT) {
Michal Vasko7b1ad1a2020-11-02 15:41:27 +0100866 getnext_opts = LYS_GETNEXT_OUTPUT;
Michal Vasko00cbf532020-06-15 13:58:47 +0200867 } else {
Michal Vasko7b1ad1a2020-11-02 15:41:27 +0100868 getnext_opts = 0;
Michal Vasko00cbf532020-06-15 13:58:47 +0200869 }
870
Michal Vasko004d3152020-06-11 19:59:22 +0200871 if (expr->tokens[tok_idx] == LYXP_TOKEN_OPER_PATH) {
872 /* absolute path */
873 ctx_node = NULL;
874
875 ++tok_idx;
876 } else {
877 /* relative path */
Michal Vasko80239792021-11-02 11:48:32 +0100878 if (!ctx_node) {
879 LOGVAL(ctx, LYVE_XPATH, "No initial schema parent for a relative path.");
880 ret = LY_EVALID;
881 goto cleanup;
882 }
883
884 /* go up the parents for leafref */
Michal Vaskoed725d72021-06-23 12:03:45 +0200885 while (lref && (expr->tokens[tok_idx] == LYXP_TOKEN_DDOT)) {
Michal Vasko004d3152020-06-11 19:59:22 +0200886 if (!ctx_node) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100887 LOGVAL(ctx, LYVE_XPATH, "Too many parent references in path.");
Michal Vasko14424ba2020-12-09 18:09:51 +0100888 ret = LY_EVALID;
889 goto cleanup;
Michal Vasko004d3152020-06-11 19:59:22 +0200890 }
891
892 /* get parent */
893 ctx_node = lysc_data_parent(ctx_node);
894
895 ++tok_idx;
896
897 assert(expr->tokens[tok_idx] == LYXP_TOKEN_OPER_PATH);
898 ++tok_idx;
899 }
Michal Vasko004d3152020-06-11 19:59:22 +0200900 }
901
902 do {
Michal Vasko00cbf532020-06-15 13:58:47 +0200903 /* check last compiled inner node, whether it is uniquely identified (even key-less list) */
Michal Vaskoed725d72021-06-23 12:03:45 +0200904 if (p && !lref && (target == LY_PATH_TARGET_SINGLE) && (p->node->nodetype == LYS_LIST) && !p->predicates) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100905 LOGVAL(ctx, LYVE_XPATH, "Predicate missing for %s \"%s\" in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200906 lys_nodetype2str(p->node->nodetype), p->node->name);
Michal Vasko14424ba2020-12-09 18:09:51 +0100907 ret = LY_EVALID;
908 goto cleanup;
Michal Vasko00cbf532020-06-15 13:58:47 +0200909 }
910
Michal Vasko14424ba2020-12-09 18:09:51 +0100911 /* NameTest */
912 LY_CHECK_ERR_GOTO(lyxp_check_token(ctx, expr, tok_idx, LYXP_TOKEN_NAMETEST), ret = LY_EVALID, cleanup);
913
Michal Vasko8cc3f662022-03-29 11:25:51 +0200914 /* get schema node */
915 LY_CHECK_GOTO(ret = ly_path_compile_snode(ctx, cur_node, cur_mod, ctx_node, expr, tok_idx, format, prefix_data,
916 top_ext, getnext_opts, &node2, &ext), cleanup);
Michal Vasko004d3152020-06-11 19:59:22 +0200917 ++tok_idx;
Michal Vasko8cc3f662022-03-29 11:25:51 +0200918 if ((op && (node2->nodetype & (LYS_RPC | LYS_ACTION | LYS_NOTIF)) && (node2 != op))) {
919 LOGVAL(ctx, LYVE_XPATH, "Not found node \"%s\" in path.", node2->name);
Radek Krejci8de005f2020-06-25 17:02:07 +0200920 ret = LY_EVALID;
Michal Vasko004d3152020-06-11 19:59:22 +0200921 goto cleanup;
922 }
923 ctx_node = node2;
924
925 /* new path segment */
Michal Vasko00cbf532020-06-15 13:58:47 +0200926 LY_ARRAY_NEW_GOTO(ctx, *path, p, ret, cleanup);
Michal Vasko004d3152020-06-11 19:59:22 +0200927 p->node = ctx_node;
Michal Vasko8cc3f662022-03-29 11:25:51 +0200928 p->ext = ext;
Michal Vasko004d3152020-06-11 19:59:22 +0200929
930 /* compile any predicates */
Michal Vaskoed725d72021-06-23 12:03:45 +0200931 if (lref) {
Michal Vasko24fc4d12021-07-12 14:41:20 +0200932 ret = ly_path_compile_predicate_leafref(ctx_node, cur_node, expr, &tok_idx, format, prefix_data);
Michal Vasko004d3152020-06-11 19:59:22 +0200933 } else {
Michal Vaskoc8a230d2020-08-14 12:17:10 +0200934 ret = ly_path_compile_predicate(ctx, cur_node, cur_mod, ctx_node, expr, &tok_idx, format, prefix_data,
Michal Vasko69730152020-10-09 16:30:07 +0200935 &p->predicates, &p->pred_type);
Michal Vasko004d3152020-06-11 19:59:22 +0200936 }
937 LY_CHECK_GOTO(ret, cleanup);
Michal Vasko004d3152020-06-11 19:59:22 +0200938 } while (!lyxp_next_token(NULL, expr, &tok_idx, LYXP_TOKEN_OPER_PATH));
939
Michal Vasko14424ba2020-12-09 18:09:51 +0100940 /* check leftover tokens */
941 if (tok_idx < expr->used) {
Michal Vasko49fec8e2022-05-24 10:28:33 +0200942 LOGVAL(ctx, LY_VCODE_XP_INTOK, lyxp_token2str(expr->tokens[tok_idx]), &expr->expr[expr->tok_pos[tok_idx]]);
Michal Vasko14424ba2020-12-09 18:09:51 +0100943 ret = LY_EVALID;
944 goto cleanup;
945 }
946
Michal Vasko00cbf532020-06-15 13:58:47 +0200947 /* check last compiled node */
Michal Vaskoed725d72021-06-23 12:03:45 +0200948 if (!lref && (target == LY_PATH_TARGET_SINGLE) && (p->node->nodetype & (LYS_LIST | LYS_LEAFLIST)) && !p->predicates) {
Radek Krejci2efc45b2020-12-22 16:25:44 +0100949 LOGVAL(ctx, LYVE_XPATH, "Predicate missing for %s \"%s\" in path.",
Michal Vasko69730152020-10-09 16:30:07 +0200950 lys_nodetype2str(p->node->nodetype), p->node->name);
Michal Vasko14424ba2020-12-09 18:09:51 +0100951 ret = LY_EVALID;
952 goto cleanup;
Michal Vasko00cbf532020-06-15 13:58:47 +0200953 }
954
Michal Vasko004d3152020-06-11 19:59:22 +0200955cleanup:
956 if (ret) {
Michal Vasko00cbf532020-06-15 13:58:47 +0200957 ly_path_free(ctx, *path);
Michal Vasko004d3152020-06-11 19:59:22 +0200958 *path = NULL;
959 }
Radek Krejciddace2c2021-01-08 11:30:56 +0100960 LOG_LOCBACK(1, 0, 0, 0);
Michal Vasko8cc3f662022-03-29 11:25:51 +0200961 return (ret == LY_ENOTFOUND) ? LY_EVALID : ret;
Michal Vasko004d3152020-06-11 19:59:22 +0200962}
963
964LY_ERR
Michal Vaskoed725d72021-06-23 12:03:45 +0200965ly_path_compile(const struct ly_ctx *ctx, const struct lys_module *cur_mod, const struct lysc_node *ctx_node,
Michal Vasko8cc3f662022-03-29 11:25:51 +0200966 const struct lysc_ext_instance *top_ext, const struct lyxp_expr *expr, uint8_t oper, uint8_t target,
Michal Vasko0884d212021-10-14 09:21:46 +0200967 ly_bool limit_access_tree, LY_VALUE_FORMAT format, void *prefix_data, struct ly_path **path)
Michal Vaskoed725d72021-06-23 12:03:45 +0200968{
Michal Vasko8cc3f662022-03-29 11:25:51 +0200969 return _ly_path_compile(ctx, cur_mod, ctx_node, top_ext, expr, 0, oper, target, limit_access_tree, format,
970 prefix_data, path);
Michal Vaskoed725d72021-06-23 12:03:45 +0200971}
972
973LY_ERR
Michal Vasko8cc3f662022-03-29 11:25:51 +0200974ly_path_compile_leafref(const struct ly_ctx *ctx, const struct lysc_node *ctx_node, const struct lysc_ext_instance *top_ext,
Michal Vaskoed725d72021-06-23 12:03:45 +0200975 const struct lyxp_expr *expr, uint8_t oper, uint8_t target, LY_VALUE_FORMAT format, void *prefix_data,
Michal Vasko24fc4d12021-07-12 14:41:20 +0200976 struct ly_path **path)
Michal Vaskoed725d72021-06-23 12:03:45 +0200977{
Michal Vasko8cc3f662022-03-29 11:25:51 +0200978 return _ly_path_compile(ctx, ctx_node->module, ctx_node, top_ext, expr, 1, oper, target, 1, format, prefix_data, path);
Michal Vaskoed725d72021-06-23 12:03:45 +0200979}
980
981LY_ERR
Michal Vaskofd69e1d2020-07-03 11:57:17 +0200982ly_path_eval_partial(const struct ly_path *path, const struct lyd_node *start, LY_ARRAY_COUNT_TYPE *path_idx,
Radek Krejci0f969882020-08-21 16:56:47 +0200983 struct lyd_node **match)
Michal Vasko004d3152020-06-11 19:59:22 +0200984{
Michal Vaskofd69e1d2020-07-03 11:57:17 +0200985 LY_ARRAY_COUNT_TYPE u;
Michal Vaskoe43e21f2022-06-07 12:26:36 +0200986 struct lyd_node *prev_node = NULL, *elem, *node = NULL, *target;
Michal Vasko004d3152020-06-11 19:59:22 +0200987 uint64_t pos;
988
989 assert(path && start);
990
991 if (lysc_data_parent(path[0].node)) {
992 /* relative path, start from the parent children */
Radek Krejcia1c1e542020-09-29 16:06:52 +0200993 start = lyd_child(start);
Michal Vasko004d3152020-06-11 19:59:22 +0200994 } else {
995 /* absolute path, start from the first top-level sibling */
996 while (start->parent) {
Michal Vasko9e685082021-01-29 14:49:09 +0100997 start = lyd_parent(start);
Michal Vasko004d3152020-06-11 19:59:22 +0200998 }
999 while (start->prev->next) {
1000 start = start->prev;
1001 }
1002 }
1003
1004 LY_ARRAY_FOR(path, u) {
1005 switch (path[u].pred_type) {
1006 case LY_PATH_PREDTYPE_POSITION:
1007 /* we cannot use hashes and want an instance on a specific position */
1008 pos = 1;
Michal Vaskoe43e21f2022-06-07 12:26:36 +02001009 node = NULL;
1010 LYD_LIST_FOR_INST(start, path[u].node, elem) {
Michal Vasko004d3152020-06-11 19:59:22 +02001011 if (pos == path[u].predicates[0].position) {
Michal Vaskoe43e21f2022-06-07 12:26:36 +02001012 node = elem;
Michal Vasko004d3152020-06-11 19:59:22 +02001013 break;
1014 }
1015 ++pos;
1016 }
1017 break;
1018 case LY_PATH_PREDTYPE_LEAFLIST:
1019 /* we will use hashes to find one leaf-list instance */
1020 LY_CHECK_RET(lyd_create_term2(path[u].node, &path[u].predicates[0].value, &target));
1021 lyd_find_sibling_first(start, target, &node);
1022 lyd_free_tree(target);
1023 break;
1024 case LY_PATH_PREDTYPE_LIST:
1025 /* we will use hashes to find one list instance */
1026 LY_CHECK_RET(lyd_create_list(path[u].node, path[u].predicates, &target));
1027 lyd_find_sibling_first(start, target, &node);
1028 lyd_free_tree(target);
1029 break;
1030 case LY_PATH_PREDTYPE_NONE:
1031 /* we will use hashes to find one any/container/leaf instance */
1032 lyd_find_sibling_val(start, path[u].node, NULL, 0, &node);
1033 break;
1034 }
1035
1036 if (!node) {
1037 /* no matching nodes */
1038 break;
1039 }
1040
Michal Vasko00cbf532020-06-15 13:58:47 +02001041 /* rememeber previous node */
1042 prev_node = node;
1043
Michal Vasko004d3152020-06-11 19:59:22 +02001044 /* next path segment, if any */
Radek Krejcia1c1e542020-09-29 16:06:52 +02001045 start = lyd_child(node);
Michal Vasko004d3152020-06-11 19:59:22 +02001046 }
1047
Michal Vasko004d3152020-06-11 19:59:22 +02001048 if (node) {
Michal Vasko00cbf532020-06-15 13:58:47 +02001049 /* we have found the full path */
1050 if (path_idx) {
1051 *path_idx = u;
1052 }
1053 if (match) {
1054 *match = node;
1055 }
Michal Vasko004d3152020-06-11 19:59:22 +02001056 return LY_SUCCESS;
Michal Vasko00cbf532020-06-15 13:58:47 +02001057
1058 } else if (prev_node) {
1059 /* we have found only some partial match */
1060 if (path_idx) {
1061 *path_idx = u - 1;
1062 }
1063 if (match) {
1064 *match = prev_node;
1065 }
1066 return LY_EINCOMPLETE;
1067 }
1068
1069 /* we have not found any nodes */
1070 if (path_idx) {
1071 *path_idx = 0;
1072 }
1073 if (match) {
1074 *match = NULL;
1075 }
1076 return LY_ENOTFOUND;
1077}
1078
1079LY_ERR
1080ly_path_eval(const struct ly_path *path, const struct lyd_node *start, struct lyd_node **match)
1081{
1082 LY_ERR ret;
1083 struct lyd_node *m;
1084
1085 ret = ly_path_eval_partial(path, start, NULL, &m);
1086
1087 if (ret == LY_SUCCESS) {
1088 /* last node was found */
1089 if (match) {
1090 *match = m;
1091 }
1092 return LY_SUCCESS;
1093 }
1094
1095 /* not a full match */
1096 if (match) {
1097 *match = NULL;
Michal Vasko004d3152020-06-11 19:59:22 +02001098 }
1099 return LY_ENOTFOUND;
1100}
1101
1102LY_ERR
1103ly_path_dup(const struct ly_ctx *ctx, const struct ly_path *path, struct ly_path **dup)
1104{
Michal Vaskofd69e1d2020-07-03 11:57:17 +02001105 LY_ARRAY_COUNT_TYPE u, v;
Michal Vasko004d3152020-06-11 19:59:22 +02001106
1107 if (!path) {
1108 return LY_SUCCESS;
1109 }
1110
Michal Vaskofd69e1d2020-07-03 11:57:17 +02001111 LY_ARRAY_CREATE_RET(ctx, *dup, LY_ARRAY_COUNT(path), LY_EMEM);
Michal Vasko004d3152020-06-11 19:59:22 +02001112 LY_ARRAY_FOR(path, u) {
1113 LY_ARRAY_INCREMENT(*dup);
1114 (*dup)[u].node = path[u].node;
1115 if (path[u].predicates) {
Michal Vaskofd69e1d2020-07-03 11:57:17 +02001116 LY_ARRAY_CREATE_RET(ctx, (*dup)[u].predicates, LY_ARRAY_COUNT(path[u].predicates), LY_EMEM);
Michal Vasko004d3152020-06-11 19:59:22 +02001117 (*dup)[u].pred_type = path[u].pred_type;
1118 LY_ARRAY_FOR(path[u].predicates, v) {
1119 struct ly_path_predicate *pred = &path[u].predicates[v];
1120
1121 LY_ARRAY_INCREMENT((*dup)[u].predicates);
1122 switch (path[u].pred_type) {
1123 case LY_PATH_PREDTYPE_POSITION:
1124 /* position-predicate */
1125 (*dup)[u].predicates[v].position = pred->position;
1126 break;
1127 case LY_PATH_PREDTYPE_LIST:
1128 case LY_PATH_PREDTYPE_LEAFLIST:
1129 /* key-predicate or leaf-list-predicate */
1130 (*dup)[u].predicates[v].key = pred->key;
Michal Vasko004d3152020-06-11 19:59:22 +02001131 pred->value.realtype->plugin->duplicate(ctx, &pred->value, &(*dup)[u].predicates[v].value);
Michal Vasko04338d92021-09-01 07:58:14 +02001132 LY_ATOMIC_INC_BARRIER(((struct lysc_type *)pred->value.realtype)->refcount);
Michal Vasko004d3152020-06-11 19:59:22 +02001133 break;
1134 case LY_PATH_PREDTYPE_NONE:
1135 break;
1136 }
1137 }
1138 }
1139 }
1140
1141 return LY_SUCCESS;
1142}
1143
1144void
Michal Vaskof7e16e22020-10-21 09:24:39 +02001145ly_path_predicates_free(const struct ly_ctx *ctx, enum ly_path_pred_type pred_type, struct ly_path_predicate *predicates)
Michal Vasko004d3152020-06-11 19:59:22 +02001146{
Michal Vaskofd69e1d2020-07-03 11:57:17 +02001147 LY_ARRAY_COUNT_TYPE u;
Michal Vasko004d3152020-06-11 19:59:22 +02001148
1149 if (!predicates) {
1150 return;
1151 }
1152
1153 LY_ARRAY_FOR(predicates, u) {
1154 switch (pred_type) {
1155 case LY_PATH_PREDTYPE_POSITION:
1156 case LY_PATH_PREDTYPE_NONE:
1157 /* nothing to free */
1158 break;
1159 case LY_PATH_PREDTYPE_LIST:
Michal Vasko004d3152020-06-11 19:59:22 +02001160 case LY_PATH_PREDTYPE_LEAFLIST:
Michal Vaskoae875662020-10-21 10:33:17 +02001161 if (predicates[u].value.realtype) {
1162 predicates[u].value.realtype->plugin->free(ctx, &predicates[u].value);
1163 lysc_type_free((struct ly_ctx *)ctx, (struct lysc_type *)predicates[u].value.realtype);
1164 }
Michal Vasko004d3152020-06-11 19:59:22 +02001165 break;
1166 }
1167 }
1168 LY_ARRAY_FREE(predicates);
1169}
1170
1171void
1172ly_path_free(const struct ly_ctx *ctx, struct ly_path *path)
1173{
Michal Vaskofd69e1d2020-07-03 11:57:17 +02001174 LY_ARRAY_COUNT_TYPE u;
Michal Vasko004d3152020-06-11 19:59:22 +02001175
Michal Vasko55b84812021-05-11 09:23:58 +02001176 if (!path) {
1177 return;
1178 }
1179
Michal Vasko004d3152020-06-11 19:59:22 +02001180 LY_ARRAY_FOR(path, u) {
Michal Vaskof7e16e22020-10-21 09:24:39 +02001181 ly_path_predicates_free(ctx, path[u].pred_type, path[u].predicates);
Michal Vasko004d3152020-06-11 19:59:22 +02001182 }
1183 LY_ARRAY_FREE(path);
1184}