src/tree_data_internal.h - github/CESNET/libyang - Gitiles

 /**
  * @file tree_data_internal.h
  * @author Radek Krejci <rkrejci@cesnet.cz>
  * @brief internal functions for YANG schema trees.
  *
  * 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_TREE_DATA_INTERNAL_H_
 #define LY_TREE_DATA_INTERNAL_H_

 #include "log.h"
 #include "lyb.h"
 #include "plugins_types.h"
 #include "set.h"
 #include "tree_data.h"

 #include <stddef.h>

 struct ly_path_predicate;
 struct lysc_module;

 /**
  * @brief Internal data parser flags.
  */
 #define LYD_INTOPT_RPC      0x01    /**< RPC/action invocation is being parsed */
 #define LYD_INTOPT_NOTIF    0x02    /**< notification is being parsed */
 #define LYD_INTOPT_REPLY    0x04    /**< RPC/action reply is being parsed */

 /**
  * @brief Hash schema sibling to be used for LYB data.
  *
  * @param[in] sibling Sibling to hash.
  * @param[in] collision_id Collision ID of the hash to generate.
  * @return Generated hash.
  */
 LYB_HASH lyb_hash(struct lysc_node *sibling, uint8_t collision_id);

 /**
  * @brief Check whether a sibling's module is in a module array.
  *
  * @param[in] sibling Sibling to check.
  * @param[in] models Modules in a sized array.
  * @return non-zero if the module was found,
  * @return Boolean value whether @p sibling's module found in the given @p models array.
  */
 ly_bool lyb_has_schema_model(const struct lysc_node *sibling, const struct lys_module **models);

 /**
  * @brief Check whether a node to be deleted is the first top-level sibling.
  *
  * @param[in] first First sibling.
  * @param[in] to_del Node to be deleted.
  */
 #define LYD_DEL_IS_ROOT(first, to_del) (((first) == (to_del)) && !(first)->parent && !(first)->prev->next)

 /**
  * @brief Get address of a node's child pointer if any.
  *
  * @param[in] node Node to check.
  * @return Address of the node's child member,
  * @return NULL if there is no child pointer.
  */
 struct lyd_node **lyd_node_children_p(struct lyd_node *node);

 /**
  * @brief Just like ::lys_getnext() but iterates over all data instances of the schema nodes.
  *
  * @param[in] last Last returned data node.
  * @param[in] sibling Data node sibling to search in.
  * @param[in,out] slast Schema last node, set to NULL for first call and do not change afterwards.
  * May not be set if the function is used only for any suitable node existence check (such as the existence
  * of any choice case data).
  * @param[in] parent Schema parent of the iterated children nodes.
  * @param[in] module Schema module of the iterated top-level nodes.
  * @return Next matching data node,
  * @return NULL if last data node was already returned.
  */
 struct lyd_node *lys_getnext_data(const struct lyd_node *last, const struct lyd_node *sibling,
         const struct lysc_node **slast, const struct lysc_node *parent,
         const struct lysc_module *module);

 /**
  * @brief Create a term (leaf/leaf-list) node from a string value.
  *
  * Hash is calculated and new node flag is set.
  *
  * @param[in] schema Schema node of the new data node.
  * @param[in] value String value to be parsed.
  * @param[in] value_len Length of @p value, must be set correctly.
  * @param[in,out] dynamic Flag if @p value is dynamically allocated, is adjusted when @p value is consumed.
  * @param[in] format Input format of @p value.
  * @param[in] prefix_data Format-specific data for resolving any prefixes (see ::ly_resolve_prefix).
  * @param[in] hints [Value hints](@ref lydvalhints) from the parser regarding the value type.
  * @param[out] incomplete Whether the value needs to be resolved.
  * @param[out] node Created node.
  * @return LY_SUCCESS on success.
  * @return LY_EINCOMPLETE in case data tree is needed to finish the validation.
  * @return LY_ERR value if an error occurred.
  */
 LY_ERR lyd_create_term(const struct lysc_node *schema, const char *value, size_t value_len, ly_bool *dynamic,
         LY_PREFIX_FORMAT format, void *prefix_data, uint32_t hints, ly_bool *incomplete, struct lyd_node **node);

 /**
  * @brief Create a term (leaf/leaf-list) node from a parsed value by duplicating it.
  *
  * Hash is calculated and new node flag is set.
  *
  * @param[in] schema Schema node of the new data node.
  * @param[in] val Parsed value to use.
  * @param[out] node Created node.
  * @return LY_SUCCESS on success.
  * @return LY_ERR value if an error occurred.
  */
 LY_ERR lyd_create_term2(const struct lysc_node *schema, const struct lyd_value *val, struct lyd_node **node);

 /**
  * @brief Create an inner (container/list/RPC/action/notification) node.
  *
  * Hash is calculated and new node flag is set except
  * for list with keys, when the hash is not calculated!
  * Also, non-presence container has its default flag set.
  *
  * @param[in] schema Schema node of the new data node.
  * @param[out] node Created node.
  * @return LY_SUCCESS on success.
  * @return LY_ERR value if an error occurred.
  */
 LY_ERR lyd_create_inner(const struct lysc_node *schema, struct lyd_node **node);

 /**
  * @brief Create a list with all its keys (cannot be used for key-less list).
  *
  * Hash is calculated and new node flag is set.
  *
  * @param[in] schema Schema node of the new data node.
  * @param[in] predicates Compiled key list predicates.
  * @param[out] node Created node.
  * @return LY_SUCCESS on success.
  * @return LY_ERR value if an error occurred.
  */
 LY_ERR lyd_create_list(const struct lysc_node *schema, const struct ly_path_predicate *predicates, struct lyd_node **node);

 /**
  * @brief Create an anyxml/anydata node.
  *
  * Hash is calculated and flags are properly set based on @p is_valid.
  *
  * @param[in] schema Schema node of the new data node.
  * @param[in] value Value of the any node, is directly assigned into the data node.
  * @param[in] value_type Value type of the value.
  * @param[out] node Created node.
  * @return LY_SUCCESS on success.
  * @return LY_ERR value if an error occurred.
  */
 LY_ERR lyd_create_any(const struct lysc_node *schema, const void *value, LYD_ANYDATA_VALUETYPE value_type,
         struct lyd_node **node);

 /**
  * @brief Create an opaque node.
  *
  * @param[in] ctx libyang context.
  * @param[in] name Element name.
  * @param[in] name_len Length of @p name, must be set correctly.
  * @param[in] value String value to be parsed.
  * @param[in] value_len Length of @p value, must be set correctly.
  * @param[in,out] dynamic Flag if @p value is dynamically allocated, is adjusted when @p value is consumed.
  * @param[in] format Input format of @p value and @p ns.
  * @param[in] hints [Hints](@ref lydhints) from the parser regarding the node/value type.
  * @param[in] val_prefs Possible value prefixes, array is spent (even in case the function fails).
  * @param[in] prefix Element prefix.
  * @param[in] pref_len Length of @p prefix, must be set correctly.
  * @param[in] module_key Mandatory key to reference module, can be namespace or name.
  * @param[in] module_key_len Length of @p module_key, must be set correctly.
  * @param[out] node Created node.
  * @return LY_SUCCESS on success.
  * @return LY_ERR value if an error occurred.
  */
 LY_ERR lyd_create_opaq(const struct ly_ctx *ctx, const char *name, size_t name_len, const char *value, size_t value_len,
         ly_bool *dynamic, LYD_FORMAT format, uint32_t hints, struct ly_prefix *val_prefs, const char *prefix,
         size_t pref_len, const char *module_key, size_t module_key_len, struct lyd_node **node);

 /**
  * @brief Check the existence and create any non-existing implicit siblings, recursively for the created nodes.
  *
  * @param[in] parent Parent of the potential default values, NULL for top-level siblings.
  * @param[in,out] first First sibling.
  * @param[in] sparent Schema parent of the siblings, NULL if schema of @p parent can be used.
  * @param[in] mod Module of the default values, NULL for nested siblings.
  * @param[in] node_types Optional set to add nodes with unresolved types into.
  * @param[in] node_when Optional set to add nodes with "when" conditions into.
  * @param[in] impl_opts Implicit options (@ref implicitoptions).
  * @param[in,out] diff Validation diff.
  * @return LY_ERR value.
  */
 LY_ERR lyd_new_implicit_r(struct lyd_node *parent, struct lyd_node **first, const struct lysc_node *sparent,
         const struct lys_module *mod, struct ly_set *node_types, struct ly_set *node_when,
         uint32_t impl_opts, struct lyd_node **diff);

 /**
  * @brief Find the next node, before which to insert the new node.
  *
  * @param[in] first_sibling First sibling of the nodes to consider.
  * @param[in] new_node Node that will be inserted.
  * @return Node to insert after.
  * @return NULL if the new node should be first.
  */
 struct lyd_node *lyd_insert_get_next_anchor(const struct lyd_node *first_sibling, const struct lyd_node *new_node);

 /**
  * @brief Insert a node into parent/siblings. Order and hashes are fully handled.
  *
  * @param[in] parent Parent to insert into, NULL for top-level sibling.
  * @param[in,out] first_sibling First sibling, NULL if no top-level sibling exist yet. Can be also NULL if @p parent is set.
  * @param[in] node Individual node (without siblings) to insert.
  */
 void lyd_insert_node(struct lyd_node *parent, struct lyd_node **first_sibling, struct lyd_node *node);

 /**
  * @brief Insert a metadata (last) into a parent
  *
  * @param[in] parent Parent of the metadata.
  * @param[in] meta Metadata (list) to be added into the @p parent.
  */
 void lyd_insert_meta(struct lyd_node *parent, struct lyd_meta *meta);

 /**
  * @brief Create and insert a metadata (last) into a parent.
  *
  * @param[in] parent Parent of the metadata, can be NULL.
  * @param[in,out] meta Metadata list to add at its end if @p parent is NULL, returned created attribute.
  * @param[in] mod Metadata module (with the annotation definition).
  * @param[in] name Attribute name.
  * @param[in] name_len Length of @p name, must be set correctly.
  * @param[in] value String value to be parsed.
  * @param[in] value_len Length of @p value, must be set correctly.
  * @param[in,out] dynamic Flag if @p value is dynamically allocated, is adjusted when @p value is consumed.
  * @param[in] format Input format of @p value.
  * @param[in] prefix_data Format-specific data for resolving any prefixes (see ::ly_resolve_prefix).
  * @param[in] hints [Value hints](@ref lydvalhints) from the parser regarding the value type.
  * @param[out] incomplete Whether the value needs to be resolved.
  * @return LY_SUCCESS on success.
  * @return LY_EINCOMPLETE in case data tree is needed to finish the validation.
  * @return LY_ERR value if an error occurred.
  */
 LY_ERR lyd_create_meta(struct lyd_node *parent, struct lyd_meta **meta, const struct lys_module *mod, const char *name,
         size_t name_len, const char *value, size_t value_len, ly_bool *dynamic, LY_PREFIX_FORMAT format,
         void *prefix_data, uint32_t hints, ly_bool *incomplete);

 /**
  * @brief Insert an attribute (last) into a parent
  *
  * @param[in] parent Parent of the attributes.
  * @param[in] attr Attribute (list) to be added into the @p parent.
  */
 void lyd_insert_attr(struct lyd_node *parent, struct lyd_attr *attr);

 /**
  * @brief Create and insert a generic attribute (last) into a parent.
  *
  * @param[in] parent Parent of the attribute, can be NULL.
  * @param[in,out] attr Attribute list to add at its end if @p parent is NULL, returned created attribute.
  * @param[in] ctx libyang context.
  * @param[in] name Attribute name.
  * @param[in] name_len Length of @p name, must be set correctly.
  * @param[in] value String value to be parsed.
  * @param[in] value_len Length of @p value, must be set correctly.
  * @param[in,out] dynamic Flag if @p value is dynamically allocated, is adjusted when @p value is consumed.
  * @param[in] format Input format of @p value and @p ns.
  * @param[in] hints [Hints](@ref lydhints) from the parser regarding the node/value type.
  * @param[in] val_prefs Possible value prefixes, array is spent (even in case the function fails).
  * @param[in] prefix Attribute prefix.
  * @param[in] prefix_len Attribute prefix length.
  * @param[in] module_key Mandatory key to reference module, can be namespace or name.
  * @param[in] module_key_len Length of @p module_key, must be set correctly.
  * @return LY_SUCCESS on success,
  * @return LY_ERR value on error.
  */
 LY_ERR lyd_create_attr(struct lyd_node *parent, struct lyd_attr **attr, const struct ly_ctx *ctx, const char *name,
         size_t name_len, const char *value, size_t value_len, ly_bool *dynamic, LYD_FORMAT format, uint32_t hints,
         struct ly_prefix *val_prefs, const char *prefix, size_t prefix_len, const char *module_key, size_t module_key_len);

 /**
  * @brief Store and canonize the given @p value into @p val according to the schema node type rules.
  *
  * @param[in] ctx libyang context.
  * @param[in,out] val Storage for the value.
  * @param[in] type Type of the value.
  * @param[in] value String value to be parsed, must not be NULL.
  * @param[in] value_len Length of the give @p value, must be set correctly.
  * @param[in,out] dynamic Flag if @p value is dynamically allocated, is adjusted when @p value is consumed.
  * @param[in] format Input format of @p value.
  * @param[in] prefix_data Format-specific data for resolving any prefixes (see ::ly_resolve_prefix).
  * @param[in] hints [Value hints](@ref lydvalhints) from the parser.
  * @param[in] ctx_node Context schema node.
  * @param[out] incomplete Optional, set if the value also needs to be resolved.
  * @param[in] log_elem_type Elem type for logging.
  * @param[in] log_elem Elem for logging.
  * @return LY_SUCCESS on success,
  * @return LY_ERR value on error.
  */
 LY_ERR lyd_value_store(const struct ly_ctx *ctx, struct lyd_value *val, const struct lysc_type *type, const char *value,
         size_t value_len, ly_bool *dynamic, LY_PREFIX_FORMAT format, void *prefix_data, uint32_t hints,
         const struct lysc_node *ctx_node, ly_bool *incomplete, enum LY_VLOG_ELEM log_elem_type, const void *log_elem);

 /**
  * @brief Validate previously incompletely stored value.
  *
  * @param[in] ctx libyang context.
  * @param[in] type Schema type of the value (not the stored one, but the original one).
  * @param[in,out] val Stored value to resolve.
  * @param[in] ctx_node Context node for the resolution.
  * @param[in] tree Data tree for the resolution.
  * @param[in] log_elem_type Elem type for logging.
  * @param[in] log_elem Elem for logging.
  * @return LY_SUCCESS on success,
  * @return LY_ERR value on error.
  */
 LY_ERR lyd_value_validate_incomplete(const struct ly_ctx *ctx, const struct lysc_type *type, struct lyd_value *val,
         const struct lyd_node *ctx_node, const struct lyd_node *tree, enum LY_VLOG_ELEM log_elem_type, const void *log_elem);

 /* generic function lys_value_validate */
 LY_ERR _lys_value_validate(const struct ly_ctx *ctx, const struct lysc_node *node, const char *value, size_t value_len,
         LY_PREFIX_FORMAT format, void *prefix_data);

 /**
  * @defgroup datahash Data nodes hash manipulation
  * @ingroup datatree
  */

 /**
  * @brief Generate hash for the node.
  *
  * @param[in] node Data node to (re)generate hash value.
  * @return LY_ERR value.
  */
 LY_ERR lyd_hash(struct lyd_node *node);

 /**
  * @brief Insert hash of the node into the hash table of its parent.
  *
  * @param[in] node Data node which hash will be inserted into the ::lyd_node_inner.children_ht hash table of its parent.
  * @return LY_ERR value.
  */
 LY_ERR lyd_insert_hash(struct lyd_node *node);

 /**
  * @brief Maintain node's parent's children hash table when unlinking the node.
  *
  * When completely freeing data tree, it is expected to free the parent's children hash table first, at once.
  *
  * @param[in] node The data node being unlinked from its parent.
  */
 void lyd_unlink_hash(struct lyd_node *node);

 /** @} datahash */

 /**
  * @brief Iterate over implemented modules for functions that accept specific modules or the whole context.
  *
  * @param[in] tree Data tree.
  * @param[in] module Selected module, NULL for all.
  * @param[in] ctx Context, NULL for selected modules.
  * @param[in,out] i Iterator, set to 0 on first call.
  * @param[out] first First sibling of the returned module.
  * @return Next module.
  * @return NULL if all modules were traversed.
  */
 const struct lys_module *lyd_mod_next_module(struct lyd_node *tree, const struct lys_module *module,
         const struct ly_ctx *ctx, uint32_t *i, struct lyd_node **first);

 /**
  * @brief Iterate over modules for functions that want to traverse all the top-level data.
  *
  * @param[in,out] next Pointer to the next module data, set to first top-level sibling on first call.
  * @param[out] first First sibling of the returned module.
  * @return Next module.
  * @return NULL if all modules were traversed.
  */
 const struct lys_module *lyd_data_next_module(struct lyd_node **next, struct lyd_node **first);

 /**
  * @brief Check that a list has all its keys.
  *
  * @param[in] node List to check.
  * @return LY_SUCCESS on success.
  * @return LY_ENOT on a missing key.
  */
 LY_ERR lyd_parse_check_keys(struct lyd_node *node);

 /**
  * @brief Set data flags for a newly parsed node.
  *
  * @param[in] node Node to use.
  * @param[in] when_check Set of nodes with unresolved when.
  * @param[in,out] meta Node metadata, may be removed from.
  * @param[in] options Parse options.
  */
 void lyd_parse_set_data_flags(struct lyd_node *node, struct ly_set *when_check, struct lyd_meta **meta, uint32_t options);

 /**
  * @brief Free value prefixes.
  *
  * @param[in] ctx libyang context.
  * @param[in] val_prefis Value prefixes to free, sized array (@ref sizedarrays).
  */
 void ly_free_val_prefs(const struct ly_ctx *ctx, struct ly_prefix *val_prefs);

 /**
  * @brief Append all list key predicates to path.
  *
  * @param[in] node Node with keys to print.
  * @param[in,out] buffer Buffer to print to.
  * @param[in,out] buflen Current buffer length.
  * @param[in,out] bufused Current number of characters used in @p buffer.
  * @param[in] is_static Whether buffer is static or can be reallocated.
  * @return LY_ERR
  */
 LY_ERR lyd_path_list_predicate(const struct lyd_node *node, char **buffer, size_t *buflen, size_t *bufused, ly_bool is_static);

 #endif /* LY_TREE_DATA_INTERNAL_H_ */
	/**
	* @file tree_data_internal.h
	* @author Radek Krejci <rkrejci@cesnet.cz>
	* @brief internal functions for YANG schema trees.
	*
	* 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_TREE_DATA_INTERNAL_H_
	#define LY_TREE_DATA_INTERNAL_H_

	#include "log.h"
	#include "lyb.h"
	#include "plugins_types.h"
	#include "set.h"
	#include "tree_data.h"

	#include <stddef.h>

	struct ly_path_predicate;
	struct lysc_module;

	/**
	* @brief Internal data parser flags.
	*/
	#define LYD_INTOPT_RPC 0x01 /*< RPC/action invocation is being parsed /
	#define LYD_INTOPT_NOTIF 0x02 /*< notification is being parsed /
	#define LYD_INTOPT_REPLY 0x04 /*< RPC/action reply is being parsed /

	/**
	* @brief Hash schema sibling to be used for LYB data.
	*
	* @param[in] sibling Sibling to hash.
	* @param[in] collision_id Collision ID of the hash to generate.
	* @return Generated hash.
	*/
	LYB_HASH lyb_hash(struct lysc_node *sibling, uint8_t collision_id);

	/**
	* @brief Check whether a sibling's module is in a module array.
	*
	* @param[in] sibling Sibling to check.
	* @param[in] models Modules in a sized array.
	* @return non-zero if the module was found,
	* @return Boolean value whether @p sibling's module found in the given @p models array.
	*/
	ly_bool lyb_has_schema_model(const struct lysc_node sibling, const struct lys_module *models);

	/**
	* @brief Check whether a node to be deleted is the first top-level sibling.
	*
	* @param[in] first First sibling.
	* @param[in] to_del Node to be deleted.
	*/
	#define LYD_DEL_IS_ROOT(first, to_del) (((first) == (to_del)) && !(first)->parent && !(first)->prev->next)

	/**
	* @brief Get address of a node's child pointer if any.
	*
	* @param[in] node Node to check.
	* @return Address of the node's child member,
	* @return NULL if there is no child pointer.
	*/
	struct lyd_node *lyd_node_children_p(struct lyd_node node);

	/**
	* @brief Just like ::lys_getnext() but iterates over all data instances of the schema nodes.
	*
	* @param[in] last Last returned data node.
	* @param[in] sibling Data node sibling to search in.
	* @param[in,out] slast Schema last node, set to NULL for first call and do not change afterwards.
	* May not be set if the function is used only for any suitable node existence check (such as the existence
	* of any choice case data).
	* @param[in] parent Schema parent of the iterated children nodes.
	* @param[in] module Schema module of the iterated top-level nodes.
	* @return Next matching data node,
	* @return NULL if last data node was already returned.
	*/
	struct lyd_node lys_getnext_data(const struct lyd_node last, const struct lyd_node *sibling,
	const struct lysc_node *slast, const struct lysc_node parent,
	const struct lysc_module *module);

	/**
	* @brief Create a term (leaf/leaf-list) node from a string value.
	*
	* Hash is calculated and new node flag is set.
	*
	* @param[in] schema Schema node of the new data node.
	* @param[in] value String value to be parsed.
	* @param[in] value_len Length of @p value, must be set correctly.
	* @param[in,out] dynamic Flag if @p value is dynamically allocated, is adjusted when @p value is consumed.
	* @param[in] format Input format of @p value.
	* @param[in] prefix_data Format-specific data for resolving any prefixes (see ::ly_resolve_prefix).
	* @param[in] hints [Value hints](@ref lydvalhints) from the parser regarding the value type.
	* @param[out] incomplete Whether the value needs to be resolved.
	* @param[out] node Created node.
	* @return LY_SUCCESS on success.
	* @return LY_EINCOMPLETE in case data tree is needed to finish the validation.
	* @return LY_ERR value if an error occurred.
	*/
	LY_ERR lyd_create_term(const struct lysc_node schema, const char value, size_t value_len, ly_bool *dynamic,
	LY_PREFIX_FORMAT format, void prefix_data, uint32_t hints, ly_bool incomplete, struct lyd_node **node);

	/**
	* @brief Create a term (leaf/leaf-list) node from a parsed value by duplicating it.
	*
	* Hash is calculated and new node flag is set.
	*
	* @param[in] schema Schema node of the new data node.
	* @param[in] val Parsed value to use.
	* @param[out] node Created node.
	* @return LY_SUCCESS on success.
	* @return LY_ERR value if an error occurred.
	*/
	LY_ERR lyd_create_term2(const struct lysc_node schema, const struct lyd_value val, struct lyd_node **node);

	/**
	* @brief Create an inner (container/list/RPC/action/notification) node.
	*
	* Hash is calculated and new node flag is set except
	* for list with keys, when the hash is not calculated!
	* Also, non-presence container has its default flag set.
	*
	* @param[in] schema Schema node of the new data node.
	* @param[out] node Created node.
	* @return LY_SUCCESS on success.
	* @return LY_ERR value if an error occurred.
	*/
	LY_ERR lyd_create_inner(const struct lysc_node schema, struct lyd_node *node);

	/**
	* @brief Create a list with all its keys (cannot be used for key-less list).
	*
	* Hash is calculated and new node flag is set.
	*
	* @param[in] schema Schema node of the new data node.
	* @param[in] predicates Compiled key list predicates.
	* @param[out] node Created node.
	* @return LY_SUCCESS on success.
	* @return LY_ERR value if an error occurred.
	*/
	LY_ERR lyd_create_list(const struct lysc_node schema, const struct ly_path_predicate predicates, struct lyd_node **node);

	/**
	* @brief Create an anyxml/anydata node.
	*
	* Hash is calculated and flags are properly set based on @p is_valid.
	*
	* @param[in] schema Schema node of the new data node.
	* @param[in] value Value of the any node, is directly assigned into the data node.
	* @param[in] value_type Value type of the value.
	* @param[out] node Created node.
	* @return LY_SUCCESS on success.
	* @return LY_ERR value if an error occurred.
	*/
	LY_ERR lyd_create_any(const struct lysc_node schema, const void value, LYD_ANYDATA_VALUETYPE value_type,
	struct lyd_node **node);

	/**
	* @brief Create an opaque node.
	*
	* @param[in] ctx libyang context.
	* @param[in] name Element name.
	* @param[in] name_len Length of @p name, must be set correctly.
	* @param[in] value String value to be parsed.
	* @param[in] value_len Length of @p value, must be set correctly.
	* @param[in,out] dynamic Flag if @p value is dynamically allocated, is adjusted when @p value is consumed.
	* @param[in] format Input format of @p value and @p ns.
	* @param[in] hints [Hints](@ref lydhints) from the parser regarding the node/value type.
	* @param[in] val_prefs Possible value prefixes, array is spent (even in case the function fails).
	* @param[in] prefix Element prefix.
	* @param[in] pref_len Length of @p prefix, must be set correctly.
	* @param[in] module_key Mandatory key to reference module, can be namespace or name.
	* @param[in] module_key_len Length of @p module_key, must be set correctly.
	* @param[out] node Created node.
	* @return LY_SUCCESS on success.
	* @return LY_ERR value if an error occurred.
	*/
	LY_ERR lyd_create_opaq(const struct ly_ctx ctx, const char name, size_t name_len, const char *value, size_t value_len,
	ly_bool dynamic, LYD_FORMAT format, uint32_t hints, struct ly_prefix val_prefs, const char *prefix,
	size_t pref_len, const char module_key, size_t module_key_len, struct lyd_node *node);

	/**
	* @brief Check the existence and create any non-existing implicit siblings, recursively for the created nodes.
	*
	* @param[in] parent Parent of the potential default values, NULL for top-level siblings.
	* @param[in,out] first First sibling.
	* @param[in] sparent Schema parent of the siblings, NULL if schema of @p parent can be used.
	* @param[in] mod Module of the default values, NULL for nested siblings.
	* @param[in] node_types Optional set to add nodes with unresolved types into.
	* @param[in] node_when Optional set to add nodes with "when" conditions into.
	* @param[in] impl_opts Implicit options (@ref implicitoptions).
	* @param[in,out] diff Validation diff.
	* @return LY_ERR value.
	*/
	LY_ERR lyd_new_implicit_r(struct lyd_node parent, struct lyd_node first, const struct lysc_node sparent,
	const struct lys_module mod, struct ly_set node_types, struct ly_set *node_when,
	uint32_t impl_opts, struct lyd_node **diff);

	/**
	* @brief Find the next node, before which to insert the new node.
	*
	* @param[in] first_sibling First sibling of the nodes to consider.
	* @param[in] new_node Node that will be inserted.
	* @return Node to insert after.
	* @return NULL if the new node should be first.
	*/
	struct lyd_node lyd_insert_get_next_anchor(const struct lyd_node first_sibling, const struct lyd_node *new_node);

	/**
	* @brief Insert a node into parent/siblings. Order and hashes are fully handled.
	*
	* @param[in] parent Parent to insert into, NULL for top-level sibling.
	* @param[in,out] first_sibling First sibling, NULL if no top-level sibling exist yet. Can be also NULL if @p parent is set.
	* @param[in] node Individual node (without siblings) to insert.
	*/
	void lyd_insert_node(struct lyd_node parent, struct lyd_node first_sibling, struct lyd_node node);

	/**
	* @brief Insert a metadata (last) into a parent
	*
	* @param[in] parent Parent of the metadata.
	* @param[in] meta Metadata (list) to be added into the @p parent.
	*/
	void lyd_insert_meta(struct lyd_node parent, struct lyd_meta meta);

	/**
	* @brief Create and insert a metadata (last) into a parent.
	*
	* @param[in] parent Parent of the metadata, can be NULL.
	* @param[in,out] meta Metadata list to add at its end if @p parent is NULL, returned created attribute.
	* @param[in] mod Metadata module (with the annotation definition).
	* @param[in] name Attribute name.
	* @param[in] name_len Length of @p name, must be set correctly.
	* @param[in] value String value to be parsed.
	* @param[in] value_len Length of @p value, must be set correctly.
	* @param[in,out] dynamic Flag if @p value is dynamically allocated, is adjusted when @p value is consumed.
	* @param[in] format Input format of @p value.
	* @param[in] prefix_data Format-specific data for resolving any prefixes (see ::ly_resolve_prefix).
	* @param[in] hints [Value hints](@ref lydvalhints) from the parser regarding the value type.
	* @param[out] incomplete Whether the value needs to be resolved.
	* @return LY_SUCCESS on success.
	* @return LY_EINCOMPLETE in case data tree is needed to finish the validation.
	* @return LY_ERR value if an error occurred.
	*/
	LY_ERR lyd_create_meta(struct lyd_node parent, struct lyd_meta meta, const struct lys_module mod, const char *name,
	size_t name_len, const char value, size_t value_len, ly_bool dynamic, LY_PREFIX_FORMAT format,
	void prefix_data, uint32_t hints, ly_bool incomplete);

	/**
	* @brief Insert an attribute (last) into a parent
	*
	* @param[in] parent Parent of the attributes.
	* @param[in] attr Attribute (list) to be added into the @p parent.
	*/
	void lyd_insert_attr(struct lyd_node parent, struct lyd_attr attr);

	/**
	* @brief Create and insert a generic attribute (last) into a parent.
	*
	* @param[in] parent Parent of the attribute, can be NULL.
	* @param[in,out] attr Attribute list to add at its end if @p parent is NULL, returned created attribute.
	* @param[in] ctx libyang context.
	* @param[in] name Attribute name.
	* @param[in] name_len Length of @p name, must be set correctly.
	* @param[in] value String value to be parsed.
	* @param[in] value_len Length of @p value, must be set correctly.
	* @param[in,out] dynamic Flag if @p value is dynamically allocated, is adjusted when @p value is consumed.
	* @param[in] format Input format of @p value and @p ns.
	* @param[in] hints [Hints](@ref lydhints) from the parser regarding the node/value type.
	* @param[in] val_prefs Possible value prefixes, array is spent (even in case the function fails).
	* @param[in] prefix Attribute prefix.
	* @param[in] prefix_len Attribute prefix length.
	* @param[in] module_key Mandatory key to reference module, can be namespace or name.
	* @param[in] module_key_len Length of @p module_key, must be set correctly.
	* @return LY_SUCCESS on success,
	* @return LY_ERR value on error.
	*/
	LY_ERR lyd_create_attr(struct lyd_node parent, struct lyd_attr attr, const struct ly_ctx ctx, const char *name,
	size_t name_len, const char value, size_t value_len, ly_bool dynamic, LYD_FORMAT format, uint32_t hints,
	struct ly_prefix val_prefs, const char prefix, size_t prefix_len, const char *module_key, size_t module_key_len);

	/**
	* @brief Store and canonize the given @p value into @p val according to the schema node type rules.
	*
	* @param[in] ctx libyang context.
	* @param[in,out] val Storage for the value.
	* @param[in] type Type of the value.
	* @param[in] value String value to be parsed, must not be NULL.
	* @param[in] value_len Length of the give @p value, must be set correctly.
	* @param[in,out] dynamic Flag if @p value is dynamically allocated, is adjusted when @p value is consumed.
	* @param[in] format Input format of @p value.
	* @param[in] prefix_data Format-specific data for resolving any prefixes (see ::ly_resolve_prefix).
	* @param[in] hints [Value hints](@ref lydvalhints) from the parser.
	* @param[in] ctx_node Context schema node.
	* @param[out] incomplete Optional, set if the value also needs to be resolved.
	* @param[in] log_elem_type Elem type for logging.
	* @param[in] log_elem Elem for logging.
	* @return LY_SUCCESS on success,
	* @return LY_ERR value on error.
	*/
	LY_ERR lyd_value_store(const struct ly_ctx ctx, struct lyd_value val, const struct lysc_type type, const char value,
	size_t value_len, ly_bool dynamic, LY_PREFIX_FORMAT format, void prefix_data, uint32_t hints,
	const struct lysc_node ctx_node, ly_bool incomplete, enum LY_VLOG_ELEM log_elem_type, const void *log_elem);

	/**
	* @brief Validate previously incompletely stored value.
	*
	* @param[in] ctx libyang context.
	* @param[in] type Schema type of the value (not the stored one, but the original one).
	* @param[in,out] val Stored value to resolve.
	* @param[in] ctx_node Context node for the resolution.
	* @param[in] tree Data tree for the resolution.
	* @param[in] log_elem_type Elem type for logging.
	* @param[in] log_elem Elem for logging.
	* @return LY_SUCCESS on success,
	* @return LY_ERR value on error.
	*/
	LY_ERR lyd_value_validate_incomplete(const struct ly_ctx ctx, const struct lysc_type type, struct lyd_value *val,
	const struct lyd_node ctx_node, const struct lyd_node tree, enum LY_VLOG_ELEM log_elem_type, const void *log_elem);

	/* generic function lys_value_validate */
	LY_ERR _lys_value_validate(const struct ly_ctx ctx, const struct lysc_node node, const char *value, size_t value_len,
	LY_PREFIX_FORMAT format, void *prefix_data);

	/**
	* @defgroup datahash Data nodes hash manipulation
	* @ingroup datatree
	*/

	/**
	* @brief Generate hash for the node.
	*
	* @param[in] node Data node to (re)generate hash value.
	* @return LY_ERR value.
	*/
	LY_ERR lyd_hash(struct lyd_node *node);

	/**
	* @brief Insert hash of the node into the hash table of its parent.
	*
	* @param[in] node Data node which hash will be inserted into the ::lyd_node_inner.children_ht hash table of its parent.
	* @return LY_ERR value.
	*/
	LY_ERR lyd_insert_hash(struct lyd_node *node);

	/**
	* @brief Maintain node's parent's children hash table when unlinking the node.
	*
	* When completely freeing data tree, it is expected to free the parent's children hash table first, at once.
	*
	* @param[in] node The data node being unlinked from its parent.
	*/
	void lyd_unlink_hash(struct lyd_node *node);

	/** @} datahash */

	/**
	* @brief Iterate over implemented modules for functions that accept specific modules or the whole context.
	*
	* @param[in] tree Data tree.
	* @param[in] module Selected module, NULL for all.
	* @param[in] ctx Context, NULL for selected modules.
	* @param[in,out] i Iterator, set to 0 on first call.
	* @param[out] first First sibling of the returned module.
	* @return Next module.
	* @return NULL if all modules were traversed.
	*/
	const struct lys_module lyd_mod_next_module(struct lyd_node tree, const struct lys_module *module,
	const struct ly_ctx ctx, uint32_t i, struct lyd_node **first);

	/**
	* @brief Iterate over modules for functions that want to traverse all the top-level data.
	*
	* @param[in,out] next Pointer to the next module data, set to first top-level sibling on first call.
	* @param[out] first First sibling of the returned module.
	* @return Next module.
	* @return NULL if all modules were traversed.
	*/
	const struct lys_module lyd_data_next_module(struct lyd_node next, struct lyd_node *first);

	/**
	* @brief Check that a list has all its keys.
	*
	* @param[in] node List to check.
	* @return LY_SUCCESS on success.
	* @return LY_ENOT on a missing key.
	*/
	LY_ERR lyd_parse_check_keys(struct lyd_node *node);

	/**
	* @brief Set data flags for a newly parsed node.
	*
	* @param[in] node Node to use.
	* @param[in] when_check Set of nodes with unresolved when.
	* @param[in,out] meta Node metadata, may be removed from.
	* @param[in] options Parse options.
	*/
	void lyd_parse_set_data_flags(struct lyd_node node, struct ly_set when_check, struct lyd_meta **meta, uint32_t options);

	/**
	* @brief Free value prefixes.
	*
	* @param[in] ctx libyang context.
	* @param[in] val_prefis Value prefixes to free, sized array (@ref sizedarrays).
	*/
	void ly_free_val_prefs(const struct ly_ctx ctx, struct ly_prefix val_prefs);

	/**
	* @brief Append all list key predicates to path.
	*
	* @param[in] node Node with keys to print.
	* @param[in,out] buffer Buffer to print to.
	* @param[in,out] buflen Current buffer length.
	* @param[in,out] bufused Current number of characters used in @p buffer.
	* @param[in] is_static Whether buffer is static or can be reallocated.
	* @return LY_ERR
	*/
	LY_ERR lyd_path_list_predicate(const struct lyd_node node, char buffer, size_t buflen, size_t *bufused, ly_bool is_static);

	#endif /* LY_TREE_DATA_INTERNAL_H_ */