| /** |
| * @file tree_data.h |
| * @author Radek Krejci <rkrejci@cesnet.cz> |
| * @brief libyang representation of data trees. |
| * |
| * Copyright (c) 2015 CESNET, z.s.p.o. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * 3. Neither the name of the Company nor the names of its contributors |
| * may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| */ |
| |
| #ifndef LY_TREE_DATA_H_ |
| #define LY_TREE_DATA_H_ |
| |
| #include <stddef.h> |
| #include <stdint.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_XML_FORMAT, /**< For input data, it is interchangeable with #LYD_XML, for output it formats XML with indentantion */ |
| LYD_JSON, /**< JSON format of the instance data */ |
| } LYD_FORMAT; |
| |
| /** |
| * @brief Attribute structure. |
| * |
| * The structure provides information about attributes of a data element. Such attributes partially |
| * maps to annotations from draft-ietf-netmod-yang-metadata. In XML, they are represented as standard |
| * XML attrbutes. In JSON, they are represented as JSON elements starting with the '@' character |
| * (for more information, see the yang metadata draft. |
| * |
| */ |
| struct lyd_attr { |
| struct lyd_attr *next; /**< pointer to the next attribute of the same element */ |
| struct lys_module *module; /**< pointer to the attribute's module. |
| TODO when annotations will be supported, point to the annotation definition |
| and validate that the attribute is really defined there. Currently, we just |
| believe that it is defined in the module it says */ |
| const char *name; /**< attribute name */ |
| const char *value; /**< attribute value */ |
| }; |
| |
| /** |
| * @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 */ |
| } lyd_val; |
| |
| /** |
| * @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_UNIQUE 0x01 /**< Unique value(s) changed, applicable only to ::lys_node_list data nodes */ |
| #define LYD_VAL_NOT 0xff /**< node was not validated yet */ |
| /** |
| * @} |
| */ |
| |
| /** |
| * @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_anyxml structures. This structure fits only to #LYS_CONTAINER, #LYS_LIST and |
| * #LYS_CHOICE values. |
| * |
| * To traverse through all the child elements or attributes, use #LY_TREE_FOR or #LY_TREE_FOR_SAFE macro. |
| */ |
| struct lyd_node { |
| struct lys_node *schema; /**< pointer to the schema definition of this node */ |
| uint8_t validity; /**< [validity flags](@ref validityflags) */ |
| |
| 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 */ |
| 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) */ |
| |
| 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 */ |
| |
| /* 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,...) */ |
| lyd_val value; /**< node's value representation */ |
| LY_DATA_TYPE value_type; /**< type of the value in the node, mainly for union to avoid repeating of type detection */ |
| }; |
| |
| /** |
| * @brief Structure for data nodes defined as #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_anyxml { |
| struct lys_node *schema; /**< pointer to the schema definition of this node which is ::lys_node_anyxml |
| structure */ |
| uint8_t validity; /**< [validity flags](@ref validityflags) */ |
| |
| 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 */ |
| |
| /* struct lyd_node *child; should be here, but is not */ |
| |
| /* anyxml's specific members */ |
| struct lyxml_elem *value; /**< anyxml name is the root element of value! */ |
| }; |
| |
| /** |
| * @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. |
| * @{ |
| */ |
| |
| #define LYD_OPT_DATA 0x00 /**< Default type of data - complete datastore content with configuration as well as |
| state data. */ |
| #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 are not resolved |
| - list's keys/unique nodes are not required (so duplication is not checked) */ |
| #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 are not resolved |
| - list's keys/unique nodes are not required (so duplication is not checked) |
| - 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 are not resolved |
| - status data are not allowed */ |
| #define LYD_OPT_RPC 0x10 /**< Data represents RPC's input parameters. */ |
| #define LYD_OPT_RPCREPLY 0x20 /**< Data represents RPC's output parameters (maps to NETCONF <rpc-reply> data). */ |
| #define LYD_OPT_NOTIF 0x40 /**< Data represents an event notification data. */ |
| #define LYD_OPT_FILTER 0x80 /**< Data represents NETCONF subtree filter. Validation modifications: |
| - leafs/leaf-lists with no data are allowed (even not allowed e.g. by length restriction) |
| - multiple instances of container/leaf/.. are allowed |
| - list's keys/unique nodes are not required |
| - mandatory nodes can be omitted |
| - leafrefs and instance-identifier are not resolved |
| - data from different choice's branches are allowed */ |
| #define LYD_OPT_TYPEMASK 0xff /**< Mask to filter data type options. Always only a single data type option (only |
| single bit from the lower 8 bits) can be set. */ |
| |
| #define LYD_OPT_STRICT 0x0100 /**< Instead of silent ignoring data without schema definition, raise an error. */ |
| #define LYD_OPT_DESTRUCT 0x0200 /**< Free the provided XML tree during parsing the data. With this option, the |
| provided XML tree is affected and all succesfully parsed data are freed. |
| This option is applicable only to lyd_parse_xml() function. */ |
| #define LYD_OPT_OBSOLETE 0x0400 /**< Raise an error when an obsolete statement (status set to obsolete) is used. */ |
| #define LYD_OPT_NOSIBLINGS 0x0800 /**< Parse only a single XML tree from the input. This option applies only to |
| XML input data. */ |
| #define LYD_OPT_TRUSTED 0x1000 /**< 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. */ |
| |
| /**@} parseroptions */ |
| |
| /** |
| * @brief Parse (and validate according to appropriate schema from the given context) data. |
| * |
| * 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. |
| * @param[in] ... Additional argument must be supplied when #LYD_OPT_RPCREPLY value is specified in \p options. The |
| * argument is supposed to provide pointer to the RPC schema node for the reply's request |
| * (const struct ::lys_node* rpc). |
| * @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 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. |
| * @param[in] ... Additional argument must be supplied when #LYD_OPT_RPCREPLY value is specified in \p options. The |
| * argument is supposed to provide pointer to the RPC schema node for the reply's request |
| * (const struct ::lys_node* rpc). |
| * @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 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. |
| * @param[in] ... Additional argument must be supplied when #LYD_OPT_RPCREPLY value is specified in \p options. The |
| * argument is supposed to provide pointer to the RPC schema node for the reply's request |
| * (const struct ::lys_node* rpc). |
| * @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 according to appropriate schema from the given context) 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] ... Additional argument must be supplied when #LYD_OPT_RPCREPLY value is specified in \p options. The |
| * argument is supposed to provide pointer to the RPC schema node for the reply's request |
| * (const struct ::lys_node* rpc). |
| * @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. |
| * |
| * @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, or #LYS_RPC. |
| * @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. |
| * |
| * @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. |
| * |
| * Despite the prototype allows to provide a leaflist node as \p leaf parameter, only leafs are accepted. |
| * |
| * @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 on success, non-zero on error. |
| */ |
| int lyd_change_leaf(struct lyd_node_leaf_list *leaf, const char *val_str); |
| |
| /** |
| * @brief Create a new anyxml node in a data tree. |
| * |
| * @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_xml Value of the node being created. Must be a well-formed XML. |
| * @return New node, NULL on error. |
| */ |
| struct lyd_node *lyd_new_anyxml(struct lyd_node *parent, const struct lys_module *module, const char *name, |
| const char *val_xml); |
| |
| /** |
| * @brief Create a new container node in a data tree, whose schema parent is #LYS_OUTPUT. |
| * |
| * @param[in] schema Schema node of the container. |
| * @return New node, NULL on error. |
| */ |
| struct lyd_node *lyd_output_new(const struct lys_node *schema); |
| |
| /** |
| * @brief Create a new leaf or leaflist node in a data tree, whose schema parent is #LYS_OUTPUT. |
| * |
| * @param[in] schema Schema node of the leaf. |
| * @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_output_new_leaf(const struct lys_node *schema, const char *val_str); |
| |
| /** |
| * @brief Create a new anyxml node in a data tree, whose schema parent is #LYS_OUTPUT. |
| * |
| * @param[in] schema Schema node of the leaf. |
| * @param[in] val_xml Value of the node being created. Must be a well-formed XML. |
| * @return New node, NULL on error. |
| */ |
| struct lyd_node *lyd_output_new_anyxml(const struct lys_node *schema, const char *val_xml); |
| |
| /** |
| * @brief Create a copy of the specified data tree \p node. Namespaces are copied as needed, |
| * schema references are kept the same. |
| * |
| * @param[in] node Data tree node to be duplicated. |
| * @param[in] recursive 1 if all children are supposed to be also duplicated. |
| * @return Created copy of the provided data \p node. |
| */ |
| struct lyd_node *lyd_dup(const struct lyd_node *node, int recursive); |
| |
| /** |
| * @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. |
| * |
| * 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. |
| * |
| * @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 after the \p sibling element. If \p node and \p siblings are already |
| * siblings (just moving \p node position), skip validation. |
| * |
| * @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), skip validation. |
| * |
| * @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 Search in the given data for instances of nodes matching the provided XPath expression. |
| * |
| * 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 considered the context node. If the node is a configuration one, |
| * any state nodes in its tree are not accessible! |
| * @param[in] expr XPath expression filtering the matching nodes. |
| * @return Set of found data nodes (use dset member of ::ly_set). If no nodes are matching \p expr 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_get_node(const struct lyd_node *data, const char *expr); |
| |
| /** |
| * @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 (use dset member of ::ly_set). If no data node is found, the returned set is empty. |
| * In case of error, NULL is returned. |
| */ |
| struct ly_set *lyd_get_node2(const struct lyd_node *data, const struct lys_node *schema); |
| |
| /** |
| * @brief Get all key nodes of a \p list instance. |
| * |
| * @param[in] list List node, whose keys will be searched for. |
| * @return Set of list keys (use dset member of ::ly_set). If no keys are found/defined, the returned set is empty. |
| * In case of error, NULL is returned. |
| */ |
| struct ly_set *lyd_get_list_keys(const struct lyd_node *list); |
| |
| /** |
| * @brief Validate \p node data subtree. |
| * |
| * @param[in] node Data tree to be validated. |
| * @param[in] options Options for the inserting data to the target data tree options, see @ref parseroptions. |
| * @param[in] ... libyang context for the data (used only in case the \p node is NULL, so in case of checking empty data tree) |
| * @return 0 on success (if options include #LYD_OPT_FILTER, some nodes can be deleted as an |
| * optimization, which can have a bad consequences when the \p node stores a subtree instead of a tree with |
| * a top-level node(s)), nonzero in case of an error. |
| */ |
| int lyd_validate(struct lyd_node *node, int options, ...); |
| |
| /** |
| * @brief Unlink the specified data subtree. All referenced namespaces are copied. |
| * |
| * 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 (sub)tree. |
| * |
| * @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 (sub)tree and all its siblings (preceding as well as following). |
| * |
| * @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] name Attribute name including the prefix (prefix:name). Prefix must be the name of one of the |
| * schema in the \p parent's context. |
| * @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 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 Print data tree in the specified format. |
| * |
| * Same as lyd_print(), but it allocates memory and store the data into it. |
| * It is up to caller to free the returned string by free(). |
| * |
| * @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). |
| * @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. |
| * |
| * Same as lyd_print(), but output is written into the specified file descriptor. |
| * |
| * @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] fd File descriptor where to print the data. |
| * @param[in] format Data output format. |
| * @param[in] options [printer flags](@ref printerflags). |
| * @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. |
| * |
| * To write data into a file descriptor, use lyd_print_fd(). |
| * |
| * @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] f File stream where to print the data. |
| * @param[in] format Data output format. |
| * @param[in] options [printer flags](@ref printerflags). |
| * @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. |
| * |
| * Same as lyd_print(), but output is written via provided callback. |
| * |
| * @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] writeclb Callback function to write the data (see write(1)). |
| * @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). |
| * @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); |
| |
| /**@} */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* LY_TREE_DATA_H_ */ |