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/**
* @file tree_data.h
* @author Radek Krejci <rkrejci@cesnet.cz>
* @brief libyang representation of data trees.
*
* Copyright (c) 2015 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_H_
#define LY_TREE_DATA_H_
#include <stddef.h>
#include <stdint.h>
#include "libyang.h"
#include "tree_schema.h"
#include "xml.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @defgroup datatree Data Tree
* @{
*
* Data structures and functions to manipulate and access instance data tree.
*/
/**
* @brief Data input/output formats supported by libyang [parser](@ref howtodataparsers) and
* [printer](@ref howtodataprinters) functions.
*/
typedef enum {
LYD_UNKNOWN, /**< unknown format, used as return value in case of error */
LYD_XML, /**< XML format of the instance data */
LYD_JSON, /**< JSON format of the instance data */
LYD_LYB, /**< LYB format of the instance data */
} LYD_FORMAT;
/**
* @brief List of possible value types stored in ::lyd_node_anydata.
*/
typedef enum {
LYD_ANYDATA_CONSTSTRING = 0x00, /**< value is constant string (const char *) which is internally duplicated for
storing in the anydata structure; XML sensitive characters (such as & or \>)
are automatically escaped when the anydata is printed in XML format. */
LYD_ANYDATA_STRING = 0x01, /**< value is dynamically allocated string (char*), so the data are used directly
without duplication and caller is supposed to not manipulate with the data
after a successful call (including calling free() on the provided data); XML
sensitive characters (such as & or \>) are automatically escaped when the
anydata is printed in XML format */
LYD_ANYDATA_JSON = 0x02, /**< value is string containing the data modeled by YANG and encoded as I-JSON. The
string is handled as constant string. In case of using the value as input
parameter, the #LYD_ANYDATA_JSOND can be used for dynamically allocated
string. */
LYD_ANYDATA_JSOND = 0x03, /**< In case of using value as input parameter, this enumeration is supposed to be
used for dynamically allocated strings (it is actually combination of
#LYD_ANYDATA_JSON and #LYD_ANYDATA_STRING (and it can be also specified as
ORed value of the mentioned values. */
LYD_ANYDATA_SXML = 0x04, /**< value is string containing the serialized XML data. The string is handled as
constant string. In case of using the value as input parameter, the
#LYD_ANYDATA_SXMLD can be used for dynamically allocated string. */
LYD_ANYDATA_SXMLD = 0x05, /**< In case of using serialized XML value as input parameter, this enumeration is
supposed to be used for dynamically allocated strings (it is actually
combination of #LYD_ANYDATA_SXML and #LYD_ANYDATA_STRING (and it can be also
specified as ORed value of the mentioned values). */
LYD_ANYDATA_XML = 0x08, /**< value is struct lyxml_elem*, the structure is directly connected into the
anydata node without duplication, caller is supposed to not manipulate with the
data after a successful call (including calling lyxml_free() on the provided
data) */
LYD_ANYDATA_DATATREE = 0x10, /**< value is struct lyd_node* (first sibling), the structure is directly connected
into the anydata node without duplication, caller is supposed to not manipulate
with the data after a successful call (including calling lyd_free() on the
provided data) */
LYD_ANYDATA_LYB = 0x20, /**< value is a memory with serialized data tree in LYB format. The data are handled
as a constant string. In case of using the value as input parameter,
the #LYD_ANYDATA_LYBD can be used for dynamically allocated string. */
LYD_ANYDATA_LYBD = 0x21, /**< In case of using LYB value as input parameter, this enumeration is
supposed to be used for dynamically allocated strings (it is actually
combination of #LYD_ANYDATA_LYB and #LYD_ANYDATA_STRING (and it can be also
specified as ORed value of the mentioned values). */
} LYD_ANYDATA_VALUETYPE;
/**
* @brief node's value representation
*/
typedef union lyd_value_u {
const char *binary; /**< base64 encoded, NULL terminated string */
struct lys_type_bit **bit; /**< bitmap of pointers to the schema definition of the bit value that are set,
its size is always the number of defined bits in the schema */
int8_t bln; /**< 0 as false, 1 as true */
int64_t dec64; /**< decimal64: value = dec64 / 10^fraction-digits */
struct lys_type_enum *enm; /**< pointer to the schema definition of the enumeration value */
struct lys_ident *ident; /**< pointer to the schema definition of the identityref value */
struct lyd_node *instance; /**< pointer to the instance-identifier target, note that if the tree was modified,
the target (address) can be invalid - the pointer is correctly checked and updated
by lyd_validate() */
int8_t int8; /**< 8-bit signed integer */
int16_t int16; /**< 16-bit signed integer */
int32_t int32; /**< 32-bit signed integer */
int64_t int64; /**< 64-bit signed integer */
struct lyd_node *leafref; /**< pointer to the referenced leaf/leaflist instance in data tree */
const char *string; /**< string */
uint8_t uint8; /**< 8-bit unsigned integer */
uint16_t uint16; /**< 16-bit signed integer */
uint32_t uint32; /**< 32-bit signed integer */
uint64_t uint64; /**< 64-bit signed integer */
void *ptr; /**< arbitrary data stored using a type plugin */
} lyd_val;
/**
* @brief Attribute structure.
*
* The structure provides information about attributes of a data element. Such attributes must map to
* annotations as specified in RFC 7952. The only exception is the filter type (in NETCONF get operations)
* and edit-config's operation attributes. In XML, they are represented as standard XML attributes. In JSON,
* they are represented as JSON elements starting with the '@' character (for more information, see the
* YANG metadata RFC.
*
*/
struct lyd_attr {
struct lyd_node *parent; /**< data node where the attribute is placed */
struct lyd_attr *next; /**< pointer to the next attribute of the same element */
struct lys_ext_instance_complex *annotation; /**< pointer to the attribute/annotation's definition */
const char *name; /**< attribute name */
const char *value_str; /**< string representation of value (for comparison, printing,...), always corresponds to value_type */
lyd_val value; /**< node's value representation, always corresponds to schema->type.base */
LY_DATA_TYPE _PACKED value_type; /**< type of the value in the node, mainly for union to avoid repeating of type detection */
uint8_t value_flags; /**< value type flags */
};
/**
* @defgroup validityflags Validity flags
* @ingroup datatree
*
* Validity flags for data nodes.
*
* @{
*/
#define LYD_VAL_OK 0x00 /**< Node is successfully validated including whole subtree */
#define LYD_VAL_DUP 0x01 /**< Instance duplication must be checked again, applicable only to ::lys_node_list and
::lys_node_leaf_list data nodes */
#define LYD_VAL_UNIQUE 0x02 /**< Unique value(s) changed, applicable only to ::lys_node_list data nodes */
#define LYD_VAL_MAND 0x04 /**< Some child added/removed and it is needed to perform check for mandatory
node or min/max constraints of direct list/leaflist children, applicable only
to ::lys_node_list and ::lys_node_container data nodes, but if on any other node
except ::lys_node_leaflist, it means checking that data node for duplicities.
Additionally, it can be set on truly any node type and then status references
are checked for this node if flag #LYD_OPT_OBSOLETE is used. */
#define LYD_VAL_LEAFREF 0x08 /**< Node is a leafref, which needs to be resolved (it is invalid, new possible
resolvent, or something similar) */
#define LYD_VAL_INUSE 0x80 /**< Internal flag for note about various processing on data, should be used only
internally and removed before libyang returns the node to the caller */
/**
* @}
*/
/**
* @brief Generic structure for a data node, directly applicable to the data nodes defined as #LYS_CONTAINER, #LYS_LIST
* and #LYS_CHOICE.
*
* Completely fits to containers and choices and is compatible (can be used interchangeably except the #child member)
* with all other lyd_node_* structures. All data nodes are provides as ::lyd_node structure by default.
* According to the schema's ::lys_node#nodetype member, the specific object is supposed to be cast to
* ::lyd_node_leaf_list or ::lyd_node_anydata structures. This structure fits only to #LYS_CONTAINER, #LYS_LIST and
* #LYS_CHOICE values.
*
* To traverse all the child elements or attributes, use #LY_TREE_FOR or #LY_TREE_FOR_SAFE macro. To traverse
* the whole subtree, use #LY_TREE_DFS_BEGIN macro.
*/
struct lyd_node {
struct lys_node *schema; /**< pointer to the schema definition of this node */
uint8_t validity; /**< [validity flags](@ref validityflags) */
uint8_t dflt:1; /**< flag for implicit default node */
uint8_t when_status:3; /**< bit for checking if the when-stmt condition is resolved - internal use only,
do not use this value! */
struct lyd_attr *attr; /**< pointer to the list of attributes of this node */
struct lyd_node *next; /**< pointer to the next sibling node (NULL if there is no one) */
struct lyd_node *prev; /**< pointer to the previous sibling node \note Note that this pointer is
never NULL. If there is no sibling node, pointer points to the node
itself. In case of the first node, this pointer points to the last
node in the list. */
struct lyd_node *parent; /**< pointer to the parent node, NULL in case of root node */
#ifdef LY_ENABLED_LYD_PRIV
void *priv; /**< private user data, not used by libyang */
#endif
#ifdef LY_ENABLED_CACHE
uint32_t hash; /**< hash of this particular node (module name + schema name + key string values if list) */
struct hash_table *ht; /**< hash table with all the direct children (except keys for a list, lists without keys) */
#endif
struct lyd_node *child; /**< pointer to the first child node \note Since other lyd_node_*
structures represent end nodes, this member
is replaced in those structures. Therefore, be careful with accessing
this member without having information about the node type from the schema's
::lys_node#nodetype member. */
};
/**
* @brief Structure for data nodes defined as #LYS_LEAF or #LYS_LEAFLIST.
*
* Extension for ::lyd_node structure. It replaces the ::lyd_node#child member by
* three new members (#value, #value_str and #value_type) to provide
* information about the value. The first five members (#schema, #attr, #next,
* #prev and #parent) are compatible with the ::lyd_node's members.
*
* To traverse through all the child elements or attributes, use #LY_TREE_FOR or #LY_TREE_FOR_SAFE macro.
*/
struct lyd_node_leaf_list {
struct lys_node *schema; /**< pointer to the schema definition of this node which is ::lys_node_leaflist
structure */
uint8_t validity; /**< [validity flags](@ref validityflags) */
uint8_t dflt:1; /**< flag for implicit default node */
uint8_t when_status:3; /**< bit for checking if the when-stmt condition is resolved - internal use only,
do not use this value! */
struct lyd_attr *attr; /**< pointer to the list of attributes of this node */
struct lyd_node *next; /**< pointer to the next sibling node (NULL if there is no one) */
struct lyd_node *prev; /**< pointer to the previous sibling node \note Note that this pointer is
never NULL. If there is no sibling node, pointer points to the node
itself. In case of the first node, this pointer points to the last
node in the list. */
struct lyd_node *parent; /**< pointer to the parent node, NULL in case of root node */
#ifdef LY_ENABLED_LYD_PRIV
void *priv; /**< private user data, not used by libyang */
#endif
#ifdef LY_ENABLED_CACHE
uint32_t hash; /**< hash of this particular node (module name + schema name + string value if leaf-list) */
#endif
/* struct lyd_node *child; should be here, but is not */
/* leaflist's specific members */
const char *value_str; /**< string representation of value (for comparison, printing,...), always corresponds to value_type */
lyd_val value; /**< node's value representation, always corresponds to schema->type.base */
LY_DATA_TYPE _PACKED value_type; /**< type of the value in the node, mainly for union to avoid repeating of type detection */
uint8_t value_flags; /**< value type flags */
};
/**
* @brief Flags for values
*/
#define LY_VALUE_UNRES 0x01 /**< flag for unresolved leafref or instance-identifier,
leafref - value union is filled as if being the target node's type,
instance-identifier - value union should not be accessed */
#define LY_VALUE_USER 0x02 /**< flag for a user type stored value */
/* 0x80 is reserved for internal use */
/**
* @brief Anydata value union
*/
typedef union {
const char *str; /**< string value, in case of printing as XML, characters like '<' or '&' are escaped */
char *mem; /**< raw memory (used for LYB format) */
struct lyxml_elem *xml; /**< xml tree */
struct lyd_node *tree; /**< libyang data tree, does not change the root's parent, so it is not possible
to get from the data tree into the anydata/anyxml */
} lyd_anydata_value;
/**
* @brief Structure for data nodes defined as #LYS_ANYDATA or #LYS_ANYXML.
*
* Extension for ::lyd_node structure - replaces the ::lyd_node#child member by new #value member. The first five
* members (#schema, #attr, #next, #prev and #parent) are compatible with the ::lyd_node's members.
*
* To traverse through all the child elements or attributes, use #LY_TREE_FOR or #LY_TREE_FOR_SAFE macro.
*/
struct lyd_node_anydata {
struct lys_node *schema; /**< pointer to the schema definition of this node which is ::lys_node_anydata
structure */
uint8_t validity; /**< [validity flags](@ref validityflags) */
uint8_t dflt:1; /**< flag for implicit default node */
uint8_t when_status:3; /**< bit for checking if the when-stmt condition is resolved - internal use only,
do not use this value! */
struct lyd_attr *attr; /**< pointer to the list of attributes of this node */
struct lyd_node *next; /**< pointer to the next sibling node (NULL if there is no one) */
struct lyd_node *prev; /**< pointer to the previous sibling node \note Note that this pointer is
never NULL. If there is no sibling node, pointer points to the node
itself. In case of the first node, this pointer points to the last
node in the list. */
struct lyd_node *parent; /**< pointer to the parent node, NULL in case of root node */
#ifdef LY_ENABLED_LYD_PRIV
void *priv; /**< private user data, not used by libyang */
#endif
#ifdef LY_ENABLED_CACHE
uint32_t hash; /**< hash of this particular node (module name + schema name) */
#endif
/* struct lyd_node *child; should be here, but is not */
/* anyxml's specific members */
LYD_ANYDATA_VALUETYPE value_type;/**< type of the stored anydata value */
lyd_anydata_value value;/**< stored anydata value */
};
/**
* @brief list of possible types of differences in #lyd_difflist
*/
typedef enum {
LYD_DIFF_END = 0, /**< end of the differences list */
LYD_DIFF_DELETED, /**< deleted node
- Node is present in the first tree, but not in the second tree.
- To make both trees the same the node in lyd_difflist::first can be deleted from the
first tree. The pointer at the same index in the lyd_difflist::second array is
NULL.
- If the deleted node has some children, these do not appear in the resulting diff
separately. In other words, a deleted node is considered deleted with all
its children. */
LYD_DIFF_CHANGED, /**< value of a leaf or anyxml is changed, the lyd_difflist::first and lyd_difflist::second
points to the leaf/anyxml instances in the first and the second tree respectively. */
LYD_DIFF_MOVEDAFTER1, /**< user-ordered (leaf-)list item was moved.
- To make both trees the same, all #LYD_DIFF_MOVEDAFTER1 transactions must be applied
to the first tree in the strict order they appear in the difflist. The
lyd_difflist::first points to the first tree node being moved and the
lyd_difflist::second points to the first tree node after which the first node is
supposed to be moved. If the second pointer is NULL, the node is being moved into
the beginning as the first node of the (leaf-)list instances. */
LYD_DIFF_CREATED, /**< newly created node
- Node is present in the second tree, but not in the first tree.
- To make both trees the same the node in lyd_difflist::second is supposed to be
inserted (copied via lyd_dup()) into the node (as a child) at the same index in the
lyd_difflist::first array (where is its parent). If the lyd_difflist::first at the
index is NULL, the missing node is top-level.
- If the created node has some children, these do not appear in the resulting diff
separately. In other words, a created node is considered created with all
its children. */
LYD_DIFF_MOVEDAFTER2 /**< similar to LYD_DIFF_MOVEDAFTER1, but this time the moved item is in the second tree.
This type is always used in combination with (as a successor of) #LYD_DIFF_CREATED
as an instruction to move the newly created node to a specific position. If it is not
present, it means that even the parent of the user-ordered instances did not exist
(or was empty) so it is safe to just create the instances in the same order. Note,
that due to applicability to the second tree, the meaning of lyd_difflist:first and
lyd_difflist:second is inverse in comparison to #LYD_DIFF_MOVEDAFTER1. The
lyd_difflist::second points to the (previously) created node in the second tree and
the lyd_difflist::first points to the predecessor node in the second tree. If the
predecessor is NULL, the node is supposed to bes the first sibling. */
} LYD_DIFFTYPE;
/**
* @brief Structure for the result of lyd_diff(), describing differences between two data trees.
*/
struct lyd_difflist {
LYD_DIFFTYPE *type; /**< array of the differences types, terminated by #LYD_DIFF_END value. */
struct lyd_node **first; /**< array of nodes in the first tree for the specific type of difference, see the
description of #LYD_DIFFTYPE values for more information. */
struct lyd_node **second;/**< array of nodes in the second tree for the specific type of difference, see the
description of #LYD_DIFFTYPE values for more information. */
};
/**
* @brief Free the result of lyd_diff(). It frees the structure of the lyd_diff() result, not the referenced nodes.
*
* @param[in] diff The lyd_diff() result to free.
*/
void lyd_free_diff(struct lyd_difflist *diff);
/**
* @brief Compare two data trees and provide list of differences.
*
* Note, that the \p first and the \p second must have the same schema parent (or they must be top-level elements).
* In case of using #LYD_OPT_NOSIBLINGS, they both must be instances of the same schema node.
*
* Order of the resulting set follows these rules:
* - To change the first tree into the second tree, the resulting transactions are supposed to be applied in the order
* they appear in the result. First, the changed (#LYD_DIFF_CHANGED) nodes are described followed by the deleted
* (#LYD_DIFF_DELETED) nodes. Then, the moving of the user-ordered nodes present in both trees (#LYD_DIFF_MOVEDAFTER1)
* follows and the last transactions in the results are the newly created (#LYD_DIFF_CREATED) nodes. These nodes are
* supposed to be added as the last siblings, but in some case they can need additional move. In such a case, the
* #LYD_DIFF_MOVEDAFTER2 transactions can appear.
* - The order of the changed (#LYD_DIFF_CHANGED) and created (#LYD_DIFF_CREATED) follows the nodes order in the
* second tree - the current siblings are processed first and then the children are processed. Note, that this is
* actually not the BFS:
*
* 1 2
* / \ / \
* 3 4 7 8
* / \
* 5 6
*
* - The order of the deleted (#LYD_DIFF_DELETED) nodes is the DFS:
*
* 1 6
* / \ / \
* 2 5 7 8
* / \
* 3 4
*
* To change the first tree into the second one, it is necessary to follow the order of transactions described in
* the result. Note, that it is not possible just to use the transactions in the reverse order to transform the
* second tree into the first one. The transactions can be generalized (to be used on a different instance of the
* first tree) using lyd_path() to get identifiers for the nodes used in the transactions.
*
* @param[in] first The first (sub)tree to compare. Without #LYD_OPT_NOSIBLINGS option, all siblings are
* taken into comparison. If NULL, all the \p second nodes are supposed to be top level and they will
* be marked as #LYD_DIFF_CREATED.
* @param[in] second The second (sub)tree to compare. Without #LYD_OPT_NOSIBLINGS option, all siblings are
* taken into comparison. If NULL, all the \p first nodes will be marked as #LYD_DIFF_DELETED.
* @param[in] options The @ref diffoptions are accepted.
* @return NULL on error, the list of differences on success. In case the trees are the same, the first item in the
* lyd_difflist::type array is #LYD_DIFF_END. The returned structure is supposed to be freed by lyd_free_diff().
*/
struct lyd_difflist *lyd_diff(struct lyd_node *first, struct lyd_node *second, int options);
/**
* @defgroup diffoptions Diff options
* @ingroup datatree
*
* @{
*/
/* LYD_DIFFOPT_NOSIBLINGS value is the same as LYD_OPT_NOSIBLINGS due to backward compatibility. The LYD_OPT_NOSIBLINGS
* was used previously as an option for lyd_diff(). */
#define LYD_DIFFOPT_NOSIBLINGS 0x0800 /**< The both trees to diff have to instantiate the same schema node so only the
single subtree is compared. */
#define LYD_DIFFOPT_WITHDEFAULTS 0x0001 /**< Take default nodes with their values into account and handle them as part
of both trees. Summary of the modified behavior:
- deleted node is replaced with implicit default node - #LYD_DIFF_CHANGED instead delete
- created node replaces an implicit default node - #LYD_DIFF_CHANGED instead create
- in both cases even if the values match - #LYD_DIFF_CHANGED is still returned, because dlft flag was changed
Note that in this case, applying the resulting
transactions on the first tree does not result to the exact second tree,
because instead of having implicit default nodes you are going to have
explicit default nodes. */
/**@} diffoptions */
/**
* @brief Build data path (usable as path, see @ref howtoxpath) of the data node.
* @param[in] node Data node to be processed. Note that the node should be from a complete data tree, having a subtree
* (after using lyd_unlink()) can cause generating invalid paths.
* @return NULL on error, on success the buffer for the resulting path is allocated and caller is supposed to free it
* with free().
*/
char *lyd_path(const struct lyd_node *node);
/**
* @defgroup parseroptions Data parser options
* @ingroup datatree
*
* Various options to change the data tree parsers behavior.
*
* Default behavior:
* - in case of XML, parser reads all data from its input (file, memory, XML tree) including the case of not well-formed
* XML document (multiple top-level elements) and if there is an unknown element, it is skipped including its subtree
* (see the next point). This can be changed by the #LYD_OPT_NOSIBLINGS option which make parser to read only a single
* tree (with a single root element) from its input.
* - parser silently ignores the data without a matching node in schema trees. If the caller want to stop
* parsing in case of presence of unknown data, the #LYD_OPT_STRICT can be used. The strict mode is useful for
* NETCONF servers, since NETCONF clients should always send data according to the capabilities announced by the server.
* On the other hand, the default non-strict mode is useful for clients receiving data from NETCONF server since
* clients are not required to understand everything the server does. Of course, the optimal strategy for clients is
* to use filtering to get only the required data. Having an unknown element of the known namespace is always an error.
* The behavior can be changed by #LYD_OPT_STRICT option.
* - using obsolete statements (status set to obsolete) just generates a warning, but the processing continues. The
* behavior can be changed by #LYD_OPT_OBSOLETE option.
* - parser expects that the provided data provides complete datastore content (both the configuration and state data)
* and performs data validation according to all YANG rules. This can be a problem in case of representing NETCONF's
* subtree filter data, edit-config's data or other type of data set - such data do not represent a complete data set
* and some of the validation rules can fail. Therefore there are other options (within lower 8 bits) to make parser
* to accept such a data.
* - when parser evaluates when-stmt condition to false, a validation error is raised. If the
* #LYD_OPT_WHENAUTODEL is used, the invalid node is silently removed instead of an error. The option (and also this default
* behavior) takes effect only in case of #LYD_OPT_DATA or #LYD_OPT_CONFIG type of data.
* @{
*/
#define LYD_OPT_DATA 0x00 /**< Default type of data - complete datastore content with configuration as well as
state data. To handle possibly missing (but by default required) ietf-yang-library
data, use #LYD_OPT_DATA_NO_YANGLIB or #LYD_OPT_DATA_ADD_YANGLIB options. */
#define LYD_OPT_CONFIG 0x01 /**< A configuration datastore - complete datastore without state data.
Validation modifications:
- status data are not allowed */
#define LYD_OPT_GET 0x02 /**< Data content from a NETCONF reply message to the NETCONF \<get\> operation.
Validation modifications:
- mandatory nodes can be omitted
- leafrefs and instance-identifier resolution is allowed to fail
- list's keys/unique nodes are not required (so duplication is not checked)
- must and when evaluation skipped */
#define LYD_OPT_GETCONFIG 0x04 /**< Data content from a NETCONF reply message to the NETCONF \<get-config\> operation
Validation modifications:
- mandatory nodes can be omitted
- leafrefs and instance-identifier resolution is allowed to fail
- list's keys/unique nodes are not required (so duplication is not checked)
- must and when evaluation skipped
- status data are not allowed */
#define LYD_OPT_EDIT 0x08 /**< Content of the NETCONF \<edit-config\>'s config element.
Validation modifications:
- mandatory nodes can be omitted
- leafrefs and instance-identifier resolution is allowed to fail
- must and when evaluation skipped
- status data are not allowed */
#define LYD_OPT_RPC 0x10 /**< Data represents RPC or action input parameters. */
#define LYD_OPT_RPCREPLY 0x20 /**< Data represents RPC or action output parameters (maps to NETCONF <rpc-reply> data). */
#define LYD_OPT_NOTIF 0x40 /**< Data represents an event notification data. */
#define LYD_OPT_NOTIF_FILTER 0x80 /**< Data represents a filtered event notification data.
Validation modification:
- the only requirement is that the data tree matches the schema tree */
#define LYD_OPT_TYPEMASK 0x10000ff /**< Mask to filter data type options. Always only a single data type option (only
single bit from the lower 8 bits) can be set. */
/* 0x100 reserved, used internally */
#define LYD_OPT_STRICT 0x0200 /**< Instead of silent ignoring data without schema definition, raise an error. */
#define LYD_OPT_DESTRUCT 0x0400 /**< Free the provided XML tree during parsing the data. With this option, the
provided XML tree is affected and all successfully parsed data are freed.
This option is applicable only to lyd_parse_xml() function. */
#define LYD_OPT_OBSOLETE 0x0800 /**< Raise an error when an obsolete statement (status set to obsolete) is used. */
#define LYD_OPT_NOSIBLINGS 0x1000 /**< Parse only a single XML tree from the input. This option applies only to
XML input data. */
#define LYD_OPT_TRUSTED 0x2000 /**< Data comes from a trusted source and it is not needed to validate them. Data
are connected with the schema, but the most validation checks (mandatory nodes,
list instance uniqueness, etc.) are not performed. This option does not make
sense for lyd_validate() so it is ignored by this function. */
#define LYD_OPT_WHENAUTODEL 0x4000 /**< Automatically delete subtrees with false when-stmt condition. The flag is
applicable only in combination with #LYD_OPT_DATA and #LYD_OPT_CONFIG flags.
If used, libyang will not generate a validation error. */
#define LYD_OPT_NOEXTDEPS 0x8000 /**< Allow external dependencies (external leafrefs, instance-identifiers, must,
and when) to not be resolved/satisfied during validation. */
#define LYD_OPT_DATA_NO_YANGLIB 0x10000 /**< Ignore (possibly) missing ietf-yang-library data. Applicable only with #LYD_OPT_DATA. */
#define LYD_OPT_DATA_ADD_YANGLIB 0x20000 /**< Add missing ietf-yang-library data into the validated data tree. Applicable
only with #LYD_OPT_DATA. If some ietf-yang-library data are present, they are
preserved and option is ignored. */
#define LYD_OPT_VAL_DIFF 0x40000 /**< Flag only for validation, store all the data node changes performed by the validation
in a diff structure. */
#define LYD_OPT_DATA_TEMPLATE 0x1000000 /**< Data represents YANG data template. */
/**@} parseroptions */
/**
* @brief Parse (and validate) data from memory.
*
* In case of LY_XML format, the data string is parsed completely. It means that when it contains
* a non well-formed XML with multiple root elements, all those sibling XML trees are parsed. The
* returned data node is a root of the first tree with other trees connected via the next pointer.
* This behavior can be changed by #LYD_OPT_NOSIBLINGS option.
*
* @param[in] ctx Context to connect with the data tree being built here.
* @param[in] data Serialized data in the specified format.
* @param[in] format Format of the input data to be parsed.
* @param[in] options Parser options, see @ref parseroptions. \p format LYD_LYB uses #LYD_OPT_TRUSTED implicitly.
* @param[in] ... Variable arguments depend on \p options. If they include:
* - #LYD_OPT_DATA:
* - #LYD_OPT_CONFIG:
* - #LYD_OPT_GET:
* - #LYD_OPT_GETCONFIG:
* - #LYD_OPT_EDIT:
* - no variable arguments expected.
* - #LYD_OPT_RPC:
* - #LYD_OPT_NOTIF:
* - struct lyd_node *data_tree - additional data tree that will be used
* when checking any "when" or "must" conditions in the parsed tree that require
* some nodes outside their subtree. It must be a list of top-level elements!
* - #LYD_OPT_RPCREPLY:
* - const struct ::lyd_node *rpc_act - pointer to the whole RPC or (top-level) action operation
* data tree (the request) of the reply.
* - const struct ::lyd_node *data_tree - additional data tree that will be used
* when checking any "when" or "must" conditions in the parsed tree that require
* some nodes outside their subtree. It must be a list of top-level elements!
* @return Pointer to the built data tree or NULL in case of empty \p data. To free the returned structure,
* use lyd_free(). In these cases, the function sets #ly_errno to LY_SUCCESS. In case of error,
* #ly_errno contains appropriate error code (see #LY_ERR).
*/
struct lyd_node *lyd_parse_mem(struct ly_ctx *ctx, const char *data, LYD_FORMAT format, int options, ...);
/**
* @brief Read (and validate) data from the given file descriptor.
*
* \note Current implementation supports only reading data from standard (disk) file, not from sockets, pipes, etc.
*
* In case of LY_XML format, the file content is parsed completely. It means that when it contains
* a non well-formed XML with multiple root elements, all those sibling XML trees are parsed. The
* returned data node is a root of the first tree with other trees connected via the next pointer.
* This behavior can be changed by #LYD_OPT_NOSIBLINGS option.
*
* @param[in] ctx Context to connect with the data tree being built here.
* @param[in] fd The standard file descriptor of the file containing the data tree in the specified format.
* @param[in] format Format of the input data to be parsed.
* @param[in] options Parser options, see @ref parseroptions. \p format LYD_LYB uses #LYD_OPT_TRUSTED implicitly.
* @param[in] ... Variable arguments depend on \p options. If they include:
* - #LYD_OPT_DATA:
* - #LYD_OPT_CONFIG:
* - #LYD_OPT_GET:
* - #LYD_OPT_GETCONFIG:
* - #LYD_OPT_EDIT:
* - no variable arguments expected.
* - #LYD_OPT_RPC:
* - #LYD_OPT_NOTIF:
* - struct lyd_node *data_tree - additional data tree that will be used
* when checking any "when" or "must" conditions in the parsed tree that require
* some nodes outside their subtree. It must be a list of top-level elements!
* - #LYD_OPT_RPCREPLY:
* - const struct ::lyd_node *rpc_act - pointer to the whole RPC or action operation data
* tree (the request) of the reply.
* - const struct ::lyd_node *data_tree - additional data tree that will be used
* when checking any "when" or "must" conditions in the parsed tree that require
* some nodes outside their subtree. It must be a list of top-level elements!
* @return Pointer to the built data tree or NULL in case of empty file. To free the returned structure,
* use lyd_free(). In these cases, the function sets #ly_errno to LY_SUCCESS. In case of error,
* #ly_errno contains appropriate error code (see #LY_ERR).
*/
struct lyd_node *lyd_parse_fd(struct ly_ctx *ctx, int fd, LYD_FORMAT format, int options, ...);
/**
* @brief Read (and validate) data from the given file path.
*
* In case of LY_XML format, the file content is parsed completely. It means that when it contains
* a non well-formed XML with multiple root elements, all those sibling XML trees are parsed. The
* returned data node is a root of the first tree with other trees connected via the next pointer.
* This behavior can be changed by #LYD_OPT_NOSIBLINGS option.
*
* @param[in] ctx Context to connect with the data tree being built here.
* @param[in] path Path to the file containing the data tree in the specified format.
* @param[in] format Format of the input data to be parsed.
* @param[in] options Parser options, see @ref parseroptions. \p format LYD_LYB uses #LYD_OPT_TRUSTED implicitly.
* @param[in] ... Variable arguments depend on \p options. If they include:
* - #LYD_OPT_DATA:
* - #LYD_OPT_CONFIG:
* - #LYD_OPT_GET:
* - #LYD_OPT_GETCONFIG:
* - #LYD_OPT_EDIT:
* - no variable arguments expected.
* - #LYD_OPT_RPC:
* - #LYD_OPT_NOTIF:
* - struct lyd_node *data_tree - additional data tree that will be used
* when checking any "when" or "must" conditions in the parsed tree that require
* some nodes outside their subtree. It must be a list of top-level elements!
* - #LYD_OPT_RPCREPLY:
* - const struct ::lyd_node *rpc_act - pointer to the whole RPC or action operation data
* tree (the request) of the reply.
* - const struct ::lyd_node *data_tree - additional data tree that will be used
* when checking any "when" or "must" conditions in the parsed tree that require
* some nodes outside their subtree. It must be a list of top-level elements!
* @return Pointer to the built data tree or NULL in case of empty file. To free the returned structure,
* use lyd_free(). In these cases, the function sets #ly_errno to LY_SUCCESS. In case of error,
* #ly_errno contains appropriate error code (see #LY_ERR).
*/
struct lyd_node *lyd_parse_path(struct ly_ctx *ctx, const char *path, LYD_FORMAT format, int options, ...);
/**
* @brief Parse (and validate) XML tree.
*
* The output data tree is parsed from the given XML tree previously parsed by one of the
* lyxml_read* functions.
*
* If there are some sibling elements of the \p root (data were read with #LYXML_PARSE_MULTIROOT option
* or the provided root is a root element of a subtree), all the sibling nodes (previous as well as
* following) are processed as well. The returned data node is a root of the first tree with other
* trees connected via the next pointer. This behavior can be changed by #LYD_OPT_NOSIBLINGS option.
*
* When the function is used with #LYD_OPT_DESTRUCT, all the successfully parsed data including the
* XML \p root and all its siblings (if #LYD_OPT_NOSIBLINGS is not used) are freed. Only with
* #LYD_OPT_DESTRUCT option the \p root pointer is changed - if all the data are parsed, it is set
* to NULL, otherwise it will hold the XML tree without the successfully parsed elements.
*
* The context must be the same as the context used to parse XML tree by lyxml_read* function.
*
* @param[in] ctx Context to connect with the data tree being built here.
* @param[in,out] root XML tree to parse (convert) to data tree. By default, parser do not change the XML tree. However,
* when #LYD_OPT_DESTRUCT is specified in \p options, parser frees all successfully parsed data.
* @param[in] options Parser options, see @ref parseroptions.
* @param[in] ... Variable arguments depend on \p options. If they include:
* - #LYD_OPT_DATA:
* - #LYD_OPT_CONFIG:
* - #LYD_OPT_GET:
* - #LYD_OPT_GETCONFIG:
* - #LYD_OPT_EDIT:
* - no variable arguments expected.
* - #LYD_OPT_RPC:
* - #LYD_OPT_NOTIF:
* - struct lyd_node *data_tree - additional data tree that will be used
* when checking any "when" or "must" conditions in the parsed tree that require
* some nodes outside their subtree. It must be a list of top-level elements!
* - #LYD_OPT_RPCREPLY:
* - const struct ::lyd_node *rpc_act - pointer to the whole RPC or action operation data
* tree (the request) of the reply.
* - const struct ::lyd_node *data_tree - additional data tree that will be used
* when checking any "when" or "must" conditions in the parsed tree that require
* some nodes outside their subtree. It must be a list of top-level elements!
* @return Pointer to the built data tree or NULL in case of empty \p root. To free the returned structure,
* use lyd_free(). In these cases, the function sets #ly_errno to LY_SUCCESS. In case of error,
* #ly_errno contains appropriate error code (see #LY_ERR).
*/
struct lyd_node *lyd_parse_xml(struct ly_ctx *ctx, struct lyxml_elem **root, int options,...);
/**
* @brief Create a new container node in a data tree.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* @param[in] parent Parent node for the node being created. NULL in case of creating top level element.
* @param[in] module Module with the node being created.
* @param[in] name Schema node name of the new data node. The node can be #LYS_CONTAINER, #LYS_LIST,
* #LYS_NOTIF, #LYS_RPC, or #LYS_ACTION.
* @return New node, NULL on error.
*/
struct lyd_node *lyd_new(struct lyd_node *parent, const struct lys_module *module, const char *name);
/**
* @brief Create a new leaf or leaflist node in a data tree with a string value that is converted to
* the actual value.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* @param[in] parent Parent node for the node being created. NULL in case of creating top level element.
* @param[in] module Module with the node being created.
* @param[in] name Schema node name of the new data node.
* @param[in] val_str String form of the value of the node being created. In case the type is #LY_TYPE_INST
* or #LY_TYPE_IDENT, JSON node-id format is expected (nodes are prefixed with module names, not XML namespaces).
* @return New node, NULL on error.
*/
struct lyd_node *lyd_new_leaf(struct lyd_node *parent, const struct lys_module *module, const char *name,
const char *val_str);
/**
* @brief Change value of a leaf node.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* Despite the prototype allows to provide a leaflist node as \p leaf parameter, only leafs are accepted.
* Also, the leaf will never be default after calling this function successfully.
*
* @param[in] leaf A leaf node to change.
* @param[in] val_str String form of the new value to be set to the \p leaf. In case the type is #LY_TYPE_INST
* or #LY_TYPE_IDENT, JSON node-id format is expected (nodes are prefixed with module names, not XML namespaces).
* @return 0 if the leaf was changed successfully (either its value changed or at least its default flag was cleared),
* <0 on error,
* 1 if the (canonical) value matched the original one and no value neither default flag change occured.
*/
int lyd_change_leaf(struct lyd_node_leaf_list *leaf, const char *val_str);
/**
* @brief Create a new anydata or anyxml node in a data tree.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* This function is supposed to be a replacement for the lyd_new_anyxml_str() and lyd_new_anyxml_xml().
*
* @param[in] parent Parent node for the node being created. NULL in case of creating top level element.
* @param[in] module Module with the node being created.
* @param[in] name Schema node name of the new data node. The schema node determines if the anydata or anyxml node
* is created.
* @param[in] value Pointer to the value data to be stored in the anydata/anyxml node. The type of the data is
* determined according to the \p value_type parameter.
* @param[in] value_type Type of the provided data \p value.
* @return New node, NULL on error.
*/
struct lyd_node *lyd_new_anydata(struct lyd_node *parent, const struct lys_module *module, const char *name,
void *value, LYD_ANYDATA_VALUETYPE value_type);
/**
* @brief Create a new container node in a data tree. Ignore RPC/action input nodes and instead use RPC/action output ones.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* @param[in] parent Parent node for the node being created. NULL in case of creating top level element.
* @param[in] module Module with the node being created.
* @param[in] name Schema node name of the new data node. The node should only be #LYS_CONTAINER or #LYS_LIST,
* but accepted are also #LYS_NOTIF, #LYS_RPC, or #LYS_ACTION.
* @return New node, NULL on error.
*/
struct lyd_node *lyd_new_output(struct lyd_node *parent, const struct lys_module *module, const char *name);
/**
* @brief Create a new leaf or leaflist node in a data tree with a string value that is converted to
* the actual value. Ignore RPC/action input nodes and instead use RPC/action output ones.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* @param[in] parent Parent node for the node being created. NULL in case of creating top level element.
* @param[in] module Module with the node being created.
* @param[in] name Schema node name of the new data node.
* @param[in] val_str String form of the value of the node being created. In case the type is #LY_TYPE_INST
* or #LY_TYPE_IDENT, JSON node-id format is expected (nodes are prefixed with module names, not XML namespaces).
* @return New node, NULL on error.
*/
struct lyd_node *lyd_new_output_leaf(struct lyd_node *parent, const struct lys_module *module, const char *name,
const char *val_str);
/**
* @brief Create a new anydata or anyxml node in a data tree. Ignore RPC/action input nodes and instead use
* RPC/action output ones.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* @param[in] parent Parent node for the node being created. NULL in case of creating top level element.
* @param[in] module Module with the node being created.
* @param[in] name Schema node name of the new data node. The schema node determines if the anydata or anyxml node
* is created.
* @param[in] value Pointer to the value data to be stored in the anydata/anyxml node. The type of the data is
* determined according to the \p value_type parameter. Data are supposed to be dynamically allocated.
* Since it is directly attached into the created data node, caller is supposed to not manipulate with
* the data after a successful call (including calling free() on the provided data).
* @param[in] value_type Type of the provided data \p value.
* @return New node, NULL on error.
*/
struct lyd_node *lyd_new_output_anydata(struct lyd_node *parent, const struct lys_module *module, const char *name,
void *value, LYD_ANYDATA_VALUETYPE value_type);
/**
* @brief Create a new yang-data template in a data tree. It creates container, which name is in third parameter.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* @param[in] module Module with the node being created.
* @param[in] name_template Yang-data template name. This name is used for searching of yang-data instance.
* @param[in] name Schema node name of the new data node. This node is container.
* @return New node, NULL on error.
*/
struct lyd_node *lyd_new_yangdata(const struct lys_module *module, const char *name_template, const char *name);
/**
* @defgroup pathoptions Data path creation options
* @ingroup datatree
*
* Various options to change lyd_new_path() behavior.
*
* Default behavior:
* - if the target node already exists (and is not default), an error is returned.
* - the whole path to the target node is created (with any missing parents) if necessary.
* - RPC output schema children are completely ignored in all modules. Input is searched and nodes created normally.
* @{
*/
#define LYD_PATH_OPT_UPDATE 0x01 /**< If the target node exists, is a leaf, and it is updated with a new value or its
default flag is changed, it is returned. If the target node exists and is not
a leaf or generally no change occurs in the \p data_tree, NULL is returned and no error set. */
#define LYD_PATH_OPT_NOPARENT 0x02 /**< If any parents of the target node do not exist, return an error instead of implicitly
creating them. */
#define LYD_PATH_OPT_OUTPUT 0x04 /**< Changes the behavior to ignoring RPC/action input schema nodes and using only output ones. */
#define LYD_PATH_OPT_DFLT 0x08 /**< The created node (nodes, if also creating the parents) is a default one. If working with
data tree of type #LYD_OPT_DATA, #LYD_OPT_CONFIG, #LYD_OPT_RPC, #LYD_OPT_RPCREPLY, or
#LYD_OPT_NOTIF, this flag is never needed and therefore should not be used. However, if
the tree is #LYD_OPT_GET, #LYD_OPT_GETCONFIG, or #LYD_OPT_EDIT, the default nodes are not
created during validation and using this flag one can set them (see @ref howtodatawd). */
#define LYD_PATH_OPT_NOPARENTRET 0x10 /**< Changes the return value in the way that even if some parents were created in
addition to the path-referenced node, the path-referenced node will always be returned. */
#define LYD_PATH_OPT_EDIT 0x20 /**< Allows the creation of special leaves without value. These leaves are valid if used
in a NETCONF edit-config with delete/remove operation. */
/** @} pathoptions */
/**
* @brief Create a new data node based on a simple XPath.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* The new node is normally inserted at the end, either as the last child of a parent or as the last sibling
* if working with top-level elements. However, when manipulating RPC input or output, schema ordering is
* required and always guaranteed.
*
* If \p path points to a list key and the list does not exist, the key value from the predicate is used
* and \p value is ignored.
*
* @param[in] data_tree Existing data tree to add to/modify (including siblings). If creating RPCs/actions, there
* should only be one RPC/action and either input or output, not both. Can be NULL.
* @param[in] ctx Context to use. Mandatory if \p data_tree is NULL.
* @param[in] path Simple data path (see @ref howtoxpath). List nodes can have predicates, one for each list key
* in the correct order and with its value as well or using specific instance position, leaves and leaf-lists
* can have predicates too that have preference over \p value. When specifying an identityref value in a predicate,
* you MUST use the module name as the value prefix!
* @param[in] value Value of the new leaf/lealf-list (const char*). If creating anydata or anyxml, the following
* \p value_type parameter is required to be specified correctly. If creating nodes of other types, the
* parameter is ignored.
* @param[in] value_type Type of the provided \p value parameter in case of creating anydata or anyxml node.
* @param[in] options Bitmask of options flags, see @ref pathoptions.
* @return First created (or updated with #LYD_PATH_OPT_UPDATE) node,
* NULL if #LYD_PATH_OPT_UPDATE was used and the full path exists or the leaf original value matches \p value,
* NULL and ly_errno is set on error.
*/
struct lyd_node *lyd_new_path(struct lyd_node *data_tree, const struct ly_ctx *ctx, const char *path, void *value,
LYD_ANYDATA_VALUETYPE value_type, int options);
/**
* @brief Learn the relative instance position of a list or leaf-list within other instances of the
* same schema node.
*
* @param[in] node List or leaf-list to get the position of.
* @return 0 on error or positive integer of the instance position.
*/
unsigned int lyd_list_pos(const struct lyd_node *node);
/**
* @defgroup dupoptions Data duplication options
* @ingroup datatree
*
* Various options to change lyd_dup() behavior.
*
* Default behavior:
* - only the specified node is duplicated without siblings, parents, or children.
* - all the attributes of the duplicated nodes are also duplicated.
* @{
*/
#define LYD_DUP_OPT_RECURSIVE 0x01 /**< Duplicate not just the node but also all the children. */
#define LYD_DUP_OPT_NO_ATTR 0x02 /**< Do not duplicate attributes of any node. */
#define LYD_DUP_OPT_WITH_PARENTS 0x04 /**< If a nested node is being duplicated, duplicate also all the parents.
Keys are also duplicated for lists. Return value does not change! */
/** @} dupoptions */
/**
* @brief Create a copy of the specified data tree \p node. Schema references are kept the same. Use carefully,
* since libyang silently creates default nodes, it is always better to use lyd_dup_withsiblings() to duplicate
* the complete data tree.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* @param[in] node Data tree node to be duplicated.
* @param[in] options Bitmask of options flags, see @ref dupoptions.
* @return Created copy of the provided data \p node.
*/
struct lyd_node *lyd_dup(const struct lyd_node *node, int options);
/**
* @brief Create a copy of the specified data tree and all its siblings (preceding as well as following).
* Schema references are kept the same.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* @param[in] node Data tree sibling node to be duplicated.
* @param[in] options Bitmask of options flags, see @ref dupoptions.
* @return Created copy of the provided data \p node and all of its siblings.
*/
struct lyd_node *lyd_dup_withsiblings(const struct lyd_node *node, int options);
/**
* @brief Create a copy of the specified data tree \p node in the different context. All the
* schema references and strings are re-mapped into the specified context.
*
* If the target context does not contain the schemas used in the source data tree, error
* is raised and the new data tree is not created.
*
* @param[in] node Data tree node to be duplicated.
* @param[in] options Bitmask of options flags, see @ref dupoptions.
* @param[in] ctx Target context for the duplicated data.
* @return Created copy of the provided data \p node.
*/
struct lyd_node *lyd_dup_to_ctx(const struct lyd_node *node, int options, struct ly_ctx *ctx);
/**
* @brief Merge a (sub)tree into a data tree.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* Missing nodes are merged, leaf values updated.
*
* If \p target and \p source do not share the top-level schema node, even if they
* are from different modules, \p source parents up to top-level node will be created and
* linked to the \p target (but only containers can be created this way, lists need keys,
* so if lists are missing, an error will be returned).
*
* If the source data tree is in a different context, the resulting data are placed into the context
* of the target tree.
*
* @param[in] target Top-level (or an RPC output child) data tree to merge to. Must be valid.
* @param[in] source Data tree to merge \p target with. Must be valid (at least as a subtree).
* @param[in] options Bitmask of the following option flags:
* - #LYD_OPT_DESTRUCT - spend \p source in the function, otherwise \p source is left untouched,
* - #LYD_OPT_NOSIBLINGS - merge only the \p source subtree (ignore siblings), otherwise merge
* \p source and all its succeeding siblings (preceeding ones are still ignored!),
* - #LYD_OPT_EXPLICIT - when merging an explicitly set node and a default node, always put
* the explicit node into \p target, otherwise the node which is in \p source is used.
* @return 0 on success, nonzero in case of an error.
*/
int lyd_merge(struct lyd_node *target, const struct lyd_node *source, int options);
/**
* @brief Same as lyd_merge(), but moves the resulting data into the specified context.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* @param[in] trg Top-level (or an RPC output child) data tree to merge to. Must be valid. If its context
* differs from the specified \p ctx of the result, the provided data tree is freed and the new
* tree in the required context is returned on success. To keep the \p trg tree, convert it to the
* target context using lyd_dup_to_ctx() and then call lyd_merge() instead of lyd_merge_to_ctx().
* @param[in] src Data tree to merge \p target with. Must be valid (at least as a subtree).
* @param[in] options Bitmask of the following option flags:
* - #LYD_OPT_DESTRUCT - spend \p source in the function, otherwise \p source is left untouched,
* - #LYD_OPT_NOSIBLINGS - merge only the \p source subtree (ignore siblings), otherwise merge
* \p source and all its succeeding siblings (preceding ones are still ignored!),
* - #LYD_OPT_EXPLICIT - when merging an explicitly set node and a default node, always put
* the explicit node into \p target, otherwise the node which is in \p source is used.
* @param[in] ctx Target context in which the result will be created. Note that the successful merge requires to have
* all the used modules in the source and target data trees loaded in the target context.
* @return 0 on success, nonzero in case of an error.
*/
int lyd_merge_to_ctx(struct lyd_node **trg, const struct lyd_node *src, int options, struct ly_ctx *ctx);
#define LYD_OPT_EXPLICIT 0x0100
/**
* @brief Insert the \p node element as child to the \p parent element. The \p node is inserted as a last child of the
* \p parent.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* - if the node is part of some other tree, it is automatically unlinked.
* - if the node is the first node of a node list (with no parent), all the subsequent nodes are also inserted.
* - if the key of a list is being inserted, it is placed into a correct position instead of being placed as the last
* element.
* - if the target tree includes the default instance of the node being inserted, the default node is silently replaced
* by the new node.
* - if a default node is being inserted and the target tree already contains non-default instance, the existing
* instance is silently replaced. If it contains the exact same default node, it is replaced as well.
* - if a non-default node is being inserted and there is already its non-default instance in the target tree, the new
* node is inserted and it is up to the caller to solve the presence of multiple instances afterwards.
*
* Note that this function differs from lyd_insert_before() and lyd_insert_after() because the position of the
* node being inserted is determined automatically according to the rules described above. In contrast to
* lyd_insert_parent(), lyd_insert() can not be used for top-level elements since the \p parent parameter must not be
* NULL. If inserting something larger and not fitting the mentioned use-cases (or simply if unsure), you can always
* use lyd_merge(), it should be able to handle any situation.
*
* @param[in] parent Parent node for the \p node being inserted.
* @param[in] node The node being inserted.
* @return 0 on success, nonzero in case of error, e.g. when the node is being inserted to an inappropriate place
* in the data tree.
*/
int lyd_insert(struct lyd_node *parent, struct lyd_node *node);
/**
* @brief Insert the \p node element as a last sibling of the specified \p sibling element.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* - if the node is part of some other tree, it is automatically unlinked.
* - if the node is the first node of a node list (with no parent), all the subsequent nodes are also inserted.
* - if the key of a list is being inserted, it is placed into a correct position instead of being placed as the last
* element.
* - if the target tree includes the default instance of the node being inserted, the default node is silently replaced
* by the new node.
* - if a default node is being inserted and the target tree already contains non-default instance, the existing
* instance is silently replaced. If it contains the exact same default node, it is replaced as well.
* - if a non-default node is being inserted and there is already its non-default instance in the target tree, the new
* node is inserted and it is up to the caller to solve the presence of multiple instances afterwards.
*
* Note that this function differs from lyd_insert_before() and lyd_insert_after() because the position of the
* node being inserted is determined automatically as in the case of lyd_insert(). In contrast to lyd_insert(),
* lyd_insert_sibling() can be used to insert top-level elements. If inserting something larger and not fitting
* the mentioned use-cases (or simply if unsure), you can always use lyd_merge(), it should be able to handle
* any situation.
*
* @param[in,out] sibling Sibling node as a reference where to insert the \p node. When function succeeds, the sibling
* is always set to point to the first sibling node. Note that in some cases described above, the provided sibling
* node could be removed from the tree.
* @param[in] node The node being inserted.
* @return 0 on success, nonzero in case of error, e.g. when the node is being inserted to an inappropriate place
* in the data tree.
*/
int lyd_insert_sibling(struct lyd_node **sibling, struct lyd_node *node);
/**
* @brief Insert the \p node element after the \p sibling element. If \p node and \p siblings are already
* siblings (just moving \p node position).
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* - if the target tree includes the default instance of the node being inserted, the default node is silently removed.
* - if a default node is being inserted and the target tree already contains non-default instance, the existing
* instance is removed. If it contains the exact same default node, it is removed as well.
* - if a non-default node is being inserted and there is already its non-default instance in the target tree, the new
* node is inserted and it is up to the caller to solve the presence of multiple instances afterwards.
*
* @param[in] sibling The data tree node before which the \p node will be inserted.
* @param[in] node The data tree node to be inserted. If the node is connected somewhere, it is unlinked first.
* @return 0 on success, nonzero in case of error, e.g. when the node is being inserted to an inappropriate place
* in the data tree.
*/
int lyd_insert_before(struct lyd_node *sibling, struct lyd_node *node);
/**
* @brief Insert the \p node element after the \p sibling element. If \p node and \p siblings are already
* siblings (just moving \p node position).
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* - if the target tree includes the default instance of the node being inserted, the default node is silently removed.
* - if a default node is being inserted and the target tree already contains non-default instance, the existing
* instance is removed. If it contains the exact same default node, it is removed as well.
* - if a non-default node is being inserted and there is already its non-default instance in the target tree, the new
* node is inserted and it is up to the caller to solve the presence of multiple instances afterwards.
*
* @param[in] sibling The data tree node before which the \p node will be inserted. If \p node and \p siblings
* are already siblings (just moving \p node position), skip validation.
* @param[in] node The data tree node to be inserted. If the node is connected somewhere, it is unlinked first.
* @return 0 on success, nonzero in case of error, e.g. when the node is being inserted to an inappropriate place
* in the data tree.
*/
int lyd_insert_after(struct lyd_node *sibling, struct lyd_node *node);
/**
* @brief Order siblings according to the schema node ordering.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* If the siblings include data nodes from other modules, they are
* sorted based on the module order in the context.
*
* @param[in] sibling Node, whose siblings will be sorted.
* @param[in] recursive Whether sort all siblings of siblings, recursively.
* @return 0 on success, nonzero in case of an error.
*/
int lyd_schema_sort(struct lyd_node *sibling, int recursive);
/**
* @brief Search in the given data for instances of nodes matching the provided path.
*
* Learn more about the path format on page @ref howtoxpath.
*
* @param[in] ctx_node Path context node.
* @param[in] path Data path expression filtering the matching nodes.
* @return Set of found data nodes. If no nodes are matching \p path or the result
* would be a number, a string, or a boolean, the returned set is empty. In case of an error, NULL is returned.
*/
struct ly_set *lyd_find_path(const struct lyd_node *ctx_node, const char *path);
/**
* @brief Search in the given data for instances of the provided schema node.
*
* The \p data is used to find the data root and function then searches in the whole tree and all sibling trees.
*
* @param[in] data A node in the data tree to search.
* @param[in] schema Schema node of the data nodes caller want to find.
* @return Set of found data nodes. If no data node is found, the returned set is empty.
* In case of error, NULL is returned.
*/
struct ly_set *lyd_find_instance(const struct lyd_node *data, const struct lys_node *schema);
/**
* @brief Get the first sibling of the given node.
*
* @param[in] node Node which first sibling is going to be the result.
* @return The first sibling of the given node or the node itself if it is the first child of the parent.
*/
struct lyd_node *lyd_first_sibling(struct lyd_node *node);
/**
* @brief Validate \p node data subtree.
*
* @param[in,out] node Data tree to be validated. In case the \p options includes #LYD_OPT_WHENAUTODEL, libyang
* can modify the provided tree including the root \p node.
* @param[in] options Options for the inserting data to the target data tree options, see @ref parseroptions.
* @param[in] var_arg Variable argument depends on \p options. If they include:
* - #LYD_OPT_DATA:
* - #LYD_OPT_CONFIG:
* - #LYD_OPT_GET:
* - #LYD_OPT_GETCONFIG:
* - #LYD_OPT_EDIT:
* - struct ly_ctx *ctx - context to use when \p node is NULL (for checking an empty tree),
* otherwise can be NULL.
* - #LYD_OPT_RPC:
* - #LYD_OPT_RPCREPLY:
* - #LYD_OPT_NOTIF:
* - struct ::lyd_node *data_tree - additional data tree that will be used when checking
* any "when" or "must" conditions in the \p node tree
* that require some nodes outside their subtree. If set,
* it must be a list of top-level elements!
* @param[in] ... Used only if options include #LYD_OPT_VAL_DIFF. In that case a (struct lyd_difflist **)
* is expected into which all data node changes performed by the validation will be stored.
* Needs to be properly freed. Meaning of diff type is following:
* - LYD_DIFF_CREATED:
* - first - Path identifying the parent node (format of lyd_path()).
* - second - Duplicated subtree of the created nodes.
* - LYD_DIFF_DELETED:
* - first - Unlinked subtree of the deleted nodes.
* - second - Path identifying the original parent (format of lyd_path()).
* @return 0 on success, nonzero in case of an error.
*/
int lyd_validate(struct lyd_node **node, int options, void *var_arg, ...);
/**
* @brief Validate \p node data tree but only subtrees that belong to the schema found in \p modules. All other
* schemas are effectively disabled for the validation.
*
* @param[in,out] node Data tree to be validated. In case the \p options includes #LYD_OPT_WHENAUTODEL, libyang
* can modify the provided tree including the root \p node.
* @param[in] modules List of module names to validate.
* @param[in] mod_count Number of modules in \p modules.
* @param[in] options Options for the inserting data to the target data tree options, see @ref parseroptions.
* Accepted data type values include #LYD_OPT_DATA, #LYD_OPT_CONFIG, #LYD_OPT_GET,
* #LYD_OPT_GETCONFIG, and #LYD_OPT_EDIT.
* @param[in] ... Used only if options include #LYD_OPT_VAL_DIFF. In that case a (struct lyd_difflist **)
* is expected into which all data node changes performed by the validation will be stored.
* Needs to be properly freed. Meaning of diff type is following:
* - LYD_DIFF_CREATED:
* - first - Path identifying the parent node (format of lyd_path()).
* - second - Duplicated subtree of the created nodes.
* - LYD_DIFF_DELETED:
* - first - Unlinked subtree of the deleted nodes.
* - second - Path identifying the original parent (format of lyd_path()).
* @return 0 on success, nonzero in case of an error.
*/
int lyd_validate_modules(struct lyd_node **node, const struct lys_module **modules, int mod_count, int options, ...);
/**
* @brief Free special diff that was returned by lyd_validate() or lyd_validate_modules().
*
* @param[in] diff Diff to free.
*/
void lyd_free_val_diff(struct lyd_difflist *diff);
/**
* @brief Check restrictions applicable to the particular leaf/leaf-list on the given string value.
*
* Validates the value only using the types' restrictions. Do not check the rest of restrictions dependent on the
* data tree (must, when statements or uniqueness of the leaf-list item).
*
* The format of the data must follow rules for the lexical representation of the specific YANG type. Note
* that if there are some extensions of the lexical representation for the YANG module (default value), they are
* not supported by this function - it strictly follows rules for the lexical representations in data trees.
*
* @param[in] node Schema node of the leaf or leaf-list eventually holding the \p value.
* @param[in] value Value to be checked (NULL is checked as empty string).
* @return EXIT_SUCCESS if the \p value conforms to the restrictions, EXIT_FAILURE otherwise.
*/
int lyd_validate_value(struct lys_node *node, const char *value);
/**
* @brief Get know if the node contain (despite implicit or explicit) default value.
*
* @param[in] node The leaf or leaf-list to check. Note, that leaf-list is marked as default only when the complete
* and only the default set is present (node's siblings are also checked).
* @return 1 if the node contains the default value, 0 otherwise.
*/
int lyd_wd_default(struct lyd_node_leaf_list *node);
/**
* @brief Unlink the specified data subtree. All referenced namespaces are copied.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* Note, that the node's connection with the schema tree is kept. Therefore, in case of
* reconnecting the node to a data tree using lyd_paste() it is necessary to paste it
* to the appropriate place in the data tree following the schema.
*
* @param[in] node Data tree node to be unlinked (together with all children).
* @return 0 for success, nonzero for error
*/
int lyd_unlink(struct lyd_node *node);
/**
* @brief Free (and unlink) the specified data subtree. Use carefully, since libyang silently creates default nodes,
* it is always better to use lyd_free_withsiblings() to free the complete data tree.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* @param[in] node Root of the (sub)tree to be freed.
*/
void lyd_free(struct lyd_node *node);
/**
* @brief Free (and unlink) the specified data tree and all its siblings (preceding as well as following).
*
* If used on a top-level node it means that the whole data tree is being freed and unnecessary operations
* are skipped. Always use this function for freeing a whole data tree to achieve better performance.
*
* __PARTIAL CHANGE__ - validate after the final change on the data tree (see @ref howtodatamanipulators).
*
* @param[in] node One of the siblings root element of the (sub)trees to be freed.
*/
void lyd_free_withsiblings(struct lyd_node *node);
/**
* @brief Insert attribute into the data node.
*
* @param[in] parent Data node where to place the attribute
* @param[in] mod An alternative way to specify attribute's module (namespace) used in case the \p name does
* not include prefix. If neither prefix in the \p name nor mod is specified, the attribute's
* module is inherited from the \p parent node. It is not allowed to have attributes with no
* module (namespace).
* @param[in] name Attribute name. The string can include the attribute's module (namespace) as the name's
* prefix (prefix:name). Prefix must be the name of one of the schema in the \p parent's context.
* If the prefix is not specified, the \p mod parameter is used. If neither of these parameters is
* usable, attribute inherits module (namespace) from the \p parent node. It is not allowed to
* have attributes with no module (namespace).
* @param[in] value Attribute value
* @return pointer to the created attribute (which is already connected in \p parent) or NULL on error.
*/
struct lyd_attr *lyd_insert_attr(struct lyd_node *parent, const struct lys_module *mod, const char *name,
const char *value);
/**
* @brief Destroy data attribute
*
* If the attribute to destroy is a member of a node attribute list, it is necessary to
* provide the node itself as \p parent to keep the list consistent.
*
* @param[in] ctx Context where the attribute was created (usually it is the context of the \p parent)
* @param[in] parent Parent node where the attribute is placed
* @param[in] attr Attribute to destroy
* @param[in] recursive Zero to destroy only the attribute, non-zero to destroy also all the subsequent attributes
* in the list.
*/
void lyd_free_attr(struct ly_ctx *ctx, struct lyd_node *parent, struct lyd_attr *attr, int recursive);
/**
* @brief Return main module of the data tree node.
*
* In case of regular YANG module, it returns ::lys_node#module pointer,
* but in case of submodule, it returns pointer to the main module.
*
* @param[in] node Data tree node to be examined
* @return pointer to the main module (schema structure), NULL in case of error.
*/
struct lys_module *lyd_node_module(const struct lyd_node *node);
/**
* @brief Get the type structure of a leaf.
*
* In case of a union, the correct specific type is found.
* In case of a leafref, the final (if there is a chain of leafrefs) target's type is found.
*
* @param[in] leaf Leaf to examine.
* @return Found type, NULL on error.
*/
const struct lys_type *lyd_leaf_type(const struct lyd_node_leaf_list *leaf);
/**
* @brief Print data tree in the specified format.
*
* @param[out] strp Pointer to store the resulting dump.
* @param[in] root Root node of the data tree to print. It can be actually any (not only real root)
* node of the data tree to print the specific subtree.
* @param[in] format Data output format.
* @param[in] options [printer flags](@ref printerflags). \p format LYD_LYB accepts only #LYP_WITHSIBLINGS option.
* @return 0 on success, 1 on failure (#ly_errno is set).
*/
int lyd_print_mem(char **strp, const struct lyd_node *root, LYD_FORMAT format, int options);
/**
* @brief Print data tree in the specified format.
*
* @param[in] fd File descriptor where to print the data.
* @param[in] root Root node of the data tree to print. It can be actually any (not only real root)
* node of the data tree to print the specific subtree.
* @param[in] format Data output format.
* @param[in] options [printer flags](@ref printerflags). \p format LYD_LYB accepts only #LYP_WITHSIBLINGS option.
* @return 0 on success, 1 on failure (#ly_errno is set).
*/
int lyd_print_fd(int fd, const struct lyd_node *root, LYD_FORMAT format, int options);
/**
* @brief Print data tree in the specified format.
*
* @param[in] f File stream where to print the data.
* @param[in] root Root node of the data tree to print. It can be actually any (not only real root)
* node of the data tree to print the specific subtree.
* @param[in] format Data output format.
* @param[in] options [printer flags](@ref printerflags). \p format LYD_LYB accepts only #LYP_WITHSIBLINGS option.
* @return 0 on success, 1 on failure (#ly_errno is set).
*/
int lyd_print_file(FILE *f, const struct lyd_node *root, LYD_FORMAT format, int options);
/**
* @brief Print data tree in the specified format.
*
* @param[in] path File path where to print the data.
* @param[in] root Root node of the data tree to print. It can be actually any (not only real root)
* node of the data tree to print the specific subtree.
* @param[in] format Data output format.
* @param[in] options [printer flags](@ref printerflags). \p format LYD_LYB accepts only #LYP_WITHSIBLINGS option.
* @return 0 on success, 1 on failure (#ly_errno is set).
*/
int lyd_print_path(const char *path, const struct lyd_node *root, LYD_FORMAT format, int options);
/**
* @brief Print data tree in the specified format.
*
* @param[in] writeclb Callback function to write the data (see write(1)).
* @param[in] root Root node of the data tree to print. It can be actually any (not only real root)
* node of the data tree to print the specific subtree.
* @param[in] arg Optional caller-specific argument to be passed to the \p writeclb callback.
* @param[in] format Data output format.
* @param[in] options [printer flags](@ref printerflags). \p format LYD_LYB accepts only #LYP_WITHSIBLINGS option.
* @return 0 on success, 1 on failure (#ly_errno is set).
*/
int lyd_print_clb(ssize_t (*writeclb)(void *arg, const void *buf, size_t count), void *arg,
const struct lyd_node *root, LYD_FORMAT format, int options);
/**
* @brief Get the double value of a decimal64 leaf/leaf-list.
*
* YANG decimal64 type enables higher precision numbers than IEEE 754 double-precision
* format, so this conversion does not have to be lossless.
*
* @param[in] node Leaf/leaf-list of type decimal64.
* @return Closest double equivalent to the decimal64 value.
*/
double lyd_dec64_to_double(const struct lyd_node *node);
/**
* @brief Get the length of a printed LYB data tree.
*
* @param[in] data LYB data.
* @return \p data length or -1 on error.
*/
int lyd_lyb_data_length(const char *data);
#ifdef LY_ENABLED_LYD_PRIV
/**
* @brief Set a schema private pointer to a user pointer.
*
* @param[in] node Data node, whose private field will be assigned.
* @param[in] priv Arbitrary user-specified pointer.
* @return Previous private object of the \p node (NULL if this is the first call on the \p node). Note, that
* the caller is in this case responsible (if it is necessary) for freeing the replaced private object. In case
* of invalid (NULL) \p node, NULL is returned and #ly_errno is set to #LY_EINVAL.
*/
void *lyd_set_private(const struct lyd_node *node, void *priv);
#endif
/**@} */
#ifdef __cplusplus
}
#endif
#endif /* LY_TREE_DATA_H_ */