src/schema_compile_node.h

/**
 * @file schema_compile_node.h
 * @author Radek Krejci <rkrejci@cesnet.cz>
 * @brief Header for schema compilation of common nodes.
 *
 * Copyright (c) 2015 - 2020 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
 */

#ifndef LY_SCHEMA_COMPILE_NODE_H_
#define LY_SCHEMA_COMPILE_NODE_H_

#include <stddef.h>
#include <stdint.h>

#include "log.h"
#include "tree_data.h"
#include "tree_schema.h"

struct ly_ctx;
struct ly_set;
struct lysc_ctx;

/**
 * @brief Get the XPath context node for the given schema node.
 * @param[in] start The schema node where the XPath expression appears.
 * @return The context node to evaluate XPath expression in given schema node.
 * @return NULL in case the context node is the root node.
 */
struct lysc_node *lysc_xpath_context(struct lysc_node *start);

/**
 * @brief Compile information from the when statement by either standard compilation or by reusing
 * another compiled when structure.
 *
 * @param[in] ctx Compile context.
 * @param[in] when_p Parsed when structure.
 * @param[in] flags Flags of the parsed node with the when statement.
 * @param[in] ctx_node Context node for the when statement.
 * @param[in] node Compiled node to which add the compiled when.
 * @param[in,out] when_c Optional, pointer to the previously compiled @p when_p to be reused. Set to NULL
 * for the first call.
 * @return LY_ERR value.
 */
LY_ERR lys_compile_when(struct lysc_ctx *ctx, struct lysp_when *when_p, uint16_t flags, const struct lysc_node *ctx_node,
        struct lysc_node *node, struct lysc_when **when_c);

/**
 * @brief Checks pattern syntax.
 *
 * @param[in] ctx Context.
 * @param[in] log_path Path for logging errors.
 * @param[in] pattern Pattern to check.
 * @param[in,out] pcre2_code Compiled PCRE2 pattern. If NULL, the compiled information used to validate pattern are freed.
 * @return LY_ERR value - LY_SUCCESS, LY_EMEM, LY_EVALID.
 */
LY_ERR lys_compile_type_pattern_check(struct ly_ctx *ctx, const char *log_path, const char *pattern, pcre2_code **code);

/**
 * @brief Compile information about the leaf/leaf-list's type.
 *
 * @param[in] ctx Compile context.
 * @param[in] context_pnode Schema node where the type/typedef is placed to correctly find the base types.
 * @param[in] context_flags Flags of the context node or the referencing typedef to correctly check status of referencing and referenced objects.
 * @param[in] context_mod Module of the context node or the referencing typedef to correctly check status of referencing and referenced objects.
 * @param[in] context_name Name of the context node or referencing typedef for logging.
 * @param[in] type_p Parsed type to compile.
 * @param[out] type Newly created (or reused with increased refcount) type structure with the filled information about the type.
 * @param[out] units Storage for inheriting units value from the typedefs the current type derives from.
 * @param[out] dflt Default value for the type.
 * @return LY_ERR value.
 */
LY_ERR lys_compile_type(struct lysc_ctx *ctx, struct lysp_node *context_pnode, uint16_t context_flags,
        struct lysp_module *context_mod, const char *context_name, struct lysp_type *type_p,
        struct lysc_type **type, const char **units, struct lysp_qname **dflt);

/**
 * @brief Compile parsed RPC/action schema node information.
 *
 * @param[in] ctx Compile context
 * @param[in] action_p Parsed RPC/action schema node.
 * @param[in] parent Parent node of the action, NULL in case of RPC (top-level action)
 * @param[in,out] action Prepared (empty) compiled action structure to fill.
 * @param[in] uses_status If the RPC/action is being placed instead of uses, here we have the uses's status value (as node's flags).
 * Zero means no uses, non-zero value with no status bit set mean the default status.
 * @return LY_SUCCESS on success,
 * @return LY_EVALID on validation error,
 * @return LY_EDENIED on not-supported deviation.
 */
LY_ERR lys_compile_action(struct lysc_ctx *ctx, struct lysp_action *action_p, struct lysc_node *parent,
        struct lysc_action *action, uint16_t uses_status);

/**
 * @brief Compile parsed Notification schema node information.
 *
 * @param[in] ctx Compile context
 * @param[in] notif_p Parsed Notification schema node.
 * @param[in] parent Parent node of the Notification, NULL in case of top-level Notification
 * @param[in,out] notif Prepared (empty) compiled notification structure to fill.
 * @param[in] uses_status If the Notification is being placed instead of uses, here we have the uses's status value (as node's flags).
 * Zero means no uses, non-zero value with no status bit set mean the default status.
 * @return LY_SUCCESS on success,
 * @return LY_EVALID on validation error,
 * @return LY_EDENIED on not-supported deviation.
 */
LY_ERR lys_compile_notif(struct lysc_ctx *ctx, struct lysp_notif *notif_p, struct lysc_node *parent,
        struct lysc_notif *notif, uint16_t uses_status);

/**
 * @brief Find the node according to the given descendant/absolute schema nodeid.
 * Used in unique, refine and augment statements.
 *
 * @param[in] ctx Compile context
 * @param[in] nodeid Descendant-schema-nodeid (according to the YANG grammar)
 * @param[in] nodeid_len Length of the given nodeid, if it is not NULL-terminated string.
 * @param[in] ctx_node Context node for a relative nodeid.
 * @param[in] cur_mod Current module for the nodeid (where it was "instantiated").
 * @param[in] format Format of any prefixes.
 * @param[in] prefix_data Format-specific prefix data (see ::ly_resolve_prefix).
 * @param[in] nodetype Optional (can be 0) restriction for target's nodetype. If target exists, but does not match
 * the given nodetype, LY_EDENIED is returned (and target is provided), but no error message is printed.
 * The value can be even an ORed value to allow multiple nodetypes.
 * @param[out] target Found target node if any.
 * @param[out] result_flag Output parameter to announce if the schema nodeid goes through the action's input/output or a Notification.
 * The LYSC_OPT_RPC_INPUT, LYSC_OPT_RPC_OUTPUT and LYSC_OPT_NOTIFICATION are used as flags.
 * @return LY_ERR values - LY_ENOTFOUND, LY_EVALID, LY_EDENIED or LY_SUCCESS.
 */
LY_ERR lysc_resolve_schema_nodeid(struct lysc_ctx *ctx, const char *nodeid, size_t nodeid_len,
        const struct lysc_node *ctx_node, const struct lys_module *cur_mod, LY_PREFIX_FORMAT format, void *prefix_data,
        uint16_t nodetype, const struct lysc_node **target, uint16_t *result_flag);

/**
 * @brief Compile choice children.
 *
 * @param[in] ctx Compile context
 * @param[in] child_p Parsed choice children nodes.
 * @param[in] node Compiled choice node to compile and add children to.
 * @return LY_ERR value - LY_SUCCESS or LY_EVALID.
 */
LY_ERR lys_compile_node_choice_child(struct lysc_ctx *ctx, struct lysp_node *child_p, struct lysc_node *node,
        struct ly_set *child_set);

/**
 * @brief Set LYS_MAND_TRUE flag for the non-presence container parents.
 *
 * A non-presence container is mandatory in case it has at least one mandatory children. This function propagate
 * the flag to such parents from a mandatory children.
 *
 * @param[in] parent A schema node to be examined if the mandatory child make it also mandatory.
 * @param[in] add Flag to distinguish adding the mandatory flag (new mandatory children appeared) or removing the flag
 * (mandatory children was removed).
 */
void lys_compile_mandatory_parents(struct lysc_node *parent, ly_bool add);

/**
 * @brief Validate grouping that was defined but not used in the schema itself.
 *
 * The grouping does not need to be compiled (and it is compiled here, but the result is forgotten immediately),
 * but to have the complete result of the schema validity, even such groupings are supposed to be checked.
 *
 * @param[in] ctx Compile context.
 * @param[in] pnode Parsed parent node of the grouping, NULL for top-level.
 * @param[in] grp Parsed grouping node to check.
 * @return LY_ERR value.
 */
LY_ERR lys_compile_grouping(struct lysc_ctx *ctx, struct lysp_node *pnode, struct lysp_grp *grp);

/**
 * @brief Compile parsed schema node information.
 *
 * @param[in] ctx Compile context
 * @param[in] pnode Parsed schema node.
 * @param[in] parent Compiled parent node where the current node is supposed to be connected. It is
 * NULL for top-level nodes, in such a case the module where the node will be connected is taken from
 * the compile context.
 * @param[in] uses_status If the node is being placed instead of uses, here we have the uses's status value (as node's flags).
 * Zero means no uses, non-zero value with no status bit set mean the default status.
 * @param[in,out] child_set Optional set to add all the compiled nodes into (can be more in case of uses).
 * @return LY_ERR value - LY_SUCCESS or LY_EVALID.
 */
LY_ERR lys_compile_node(struct lysc_ctx *ctx, struct lysp_node *pnode, struct lysc_node *parent, uint16_t uses_status,
        struct ly_set *child_set);

#endif /* LY_SCHEMA_COMPILE_NODE_H_ */