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diff --git a/src/tree_data.h b/src/tree_data.h new file mode 100644 index 0000000..ff98f60 --- /dev/null +++ b/src/tree_data.h @@ -0,0 +1,2601 @@ +/** + * @file tree_data.h + * @author Radek Krejci <rkrejci@cesnet.cz> + * @author Michal Vasko <mvasko@cesnet.cz> + * @brief libyang representation of YANG data trees. + * + * Copyright (c) 2015 - 2022 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_ + +#ifdef _WIN32 +# include <winsock2.h> +# include <ws2tcpip.h> +#else +# include <arpa/inet.h> +# if defined (__FreeBSD__) || defined (__NetBSD__) || defined (__OpenBSD__) +# include <netinet/in.h> +# include <sys/socket.h> +# endif +#endif +#include <stddef.h> +#include <stdint.h> +#include <time.h> + +#include "config.h" +#include "log.h" +#include "tree.h" +#include "tree_schema.h" + +#ifdef __cplusplus +extern "C" { +#endif + +struct ly_ctx; +struct ly_path; +struct ly_set; +struct lyd_node; +struct lyd_node_opaq; +struct lyd_node_term; +struct timespec; +struct lyxp_var; + +/** + * @page howtoData Data Instances + * + * All the nodes in data tree comes are based on ::lyd_node structure. According to the content of the ::lyd_node.schema + * it can be cast to several other structures. + * + * In case the ::lyd_node.schema pointer is NULL, the node is actually __opaq__ and can be safely cast to ::lyd_node_opaq. + * The opaq node represent an unknown node which wasn't mapped to any [(compiled) schema](@ref howtoSchema) node in the + * context. Such a node can appear in several places in the data tree. + * - As a part of the tree structure, but only in the case the ::LYD_PARSE_OPAQ option was used when input data were + * [parsed](@ref howtoDataParsers), because unknown data instances are ignored by default. The same way, the opaq nodes can + * appear as a node's attributes. + * - As a representation of YANG anydata/anyxml content. + * - As envelopes of standard data tree instances (RPCs, actions or Notifications). + * + * In case the data node has its definition in a [compiled schema tree](@ref howtoSchema), the structure of the data node is + * actually one of the followings according to the schema node's nodetype (::lysc_node.nodetype). + * - ::lyd_node_inner - represents data nodes corresponding to schema nodes matching ::LYD_NODE_INNER nodetypes. They provide + * structure of the tree by having children nodes. + * - ::lyd_node_term - represents data nodes corresponding to schema nodes matching ::LYD_NODE_TERM nodetypes. The terminal + * nodes provide values of the particular configuration/status information. The values are represented as ::lyd_value + * structure with string representation of the value (retrieved by ::lyd_get_value() and ::lyd_get_meta_value()) and + * the type specific data stored in the structure's union according to the real type of the value (::lyd_value.realtype). + * The string representation provides canonical representation of the value in case the type has the canonical + * representation specified. Otherwise, it is the original value or, in case the value can contain prefixes, the JSON + * format is used to make the value unambiguous. + * - ::lyd_node_any - represents data nodes corresponding to schema nodes matching ::LYD_NODE_ANY nodetypes. + * + * Despite all the aforementioned structures and their members are available as part of the libyang API and callers can use + * it to navigate through the data tree structure or to obtain various information, we recommend to use the following macros + * and functions. + * - ::lyd_child() (or ::lyd_child_no_keys()) and ::lyd_parent() to get the node's child/parent node. + * - ::LYD_CTX to get libyang context from a data node. + * - ::lyd_get_value()/::lyd_get_meta_value() to get canonical string value from a terminal node/metadata instance. + * - ::LYD_TREE_DFS_BEGIN and ::LYD_TREE_DFS_END to traverse the data tree (depth-first). + * - ::LY_LIST_FOR and ::LY_ARRAY_FOR as described on @ref howtoStructures page. + * + * Instead of going through the data tree on your own, a specific data node can be also located using a wide set of + * \b lyd_find_*() functions. + * + * More information about specific operations with data instances can be found on the following pages: + * - @subpage howtoDataParsers + * - @subpage howtoDataValidation + * - @subpage howtoDataWD + * - @subpage howtoDataManipulation + * - @subpage howtoDataPrinters + * - @subpage howtoDataLYB + * + * \note API for this group of functions is described in the [Data Instances module](@ref datatree). + * + * Functions List (not assigned to above subsections) + * -------------------------------------------------- + * - ::lyd_child() + * - ::lyd_child_no_keys() + * - ::lyd_parent() + * - ::lyd_owner_module() + * - ::lyd_get_value() + * - ::lyd_get_meta_value() + * - ::lyd_find_xpath() + * - ::lyd_find_path() + * - ::lyd_find_target() + * - ::lyd_find_sibling_val() + * - ::lyd_find_sibling_first() + * - ::lyd_find_sibling_opaq_next() + * - ::lyd_find_meta() + * + * - ::lyd_path() + * - ::lyd_target() + * + * - ::lyd_lyb_data_length() + * + * + * @section howtoDataMetadata Metadata Support + * + * YANG Metadata annotations are defined in [RFC 7952](https://tools.ietf.org/html/rfc7952) as YANG extension (and libyang + * [implements them as internal extension plugin](@ref howtoPluginsExtensions)). In practice, it allows to have XML + * attributes (there is also a special encoding for JSON) in YANG modeled data. libyang does not allow to have any XML + * attribute without the appropriate annotation definition describing the data as it is done e.g. for leafs. When an + * attribute without a matching annotation definition is found in the input data, it is: + * - silently dropped (with warning) or + * - an error is reported in case the ::LYD_PARSE_STRICT parser option is provided to the + * [parser function](@ref howtoDataParsers) or + * - stored into a generic ::lyd_attr structure without a connection with any YANG module in case the ::LYD_PARSE_OPAQ + * parser options is provided to the [parser function](@ref howtoDataParsers). + * + * There are some XML attributes, described by [YANG](https://tools.ietf.org/html/rfc7950) and + * [NETCONF](https://tools.ietf.org/html/rfc6241) specifications, which are not defined as annotations, but libyang + * implements them this way. In case of attributes in the YANG namespace (`insert`, `value` and `key` attributes + * for the NETCONF edit-config operation), they are defined in special libyang's internal module `yang`, which is + * available in each context and the content of this schema can be printed via + * [schema printers](@ref howtoSchemaPrinters). + * + * In case of the attributes described in [NETCONF specification](https://tools.ietf.org/html/rfc6241), the libyang's + * annotations structures are hidden and cannot be printed despite, internally, they are part of the `ietf-netconf`'s + * schema structure. Therefore, these attributes are available only when the `ietf-netconf` schema is loaded in the + * context. The definitions of these annotations are as follows: + * + * md:annotation operation { + * type enumeration { + * enum merge; + * enum replace; + * enum create; + * enum delete; + * enum remove; + * } + * } + * + * md:annotation type { + * type enumeration { + * enum subtree; + * enum xpath { + * if-feature "nc:xpath"; + * } + * } + * } + * + * md:annotation select { + * type string; + * } + * + * Note, that, following the specification, + * - the `type` and `select` XML attributes are supposed to be unqualified (without namespace) and that + * - the `select`'s content is XPath and it is internally transformed by libyang into the format where the + * XML namespace prefixes are replaced by the YANG module names. + * + * + * @section howtoDataYangdata yang-data Support + * + * [RFC 8040](https://tools.ietf.org/html/rfc8040) defines ietf-restconf module, which includes yang-data extension. Despite + * the definition in the RESTCONF YANG module, the yang-data concept is quite generic and used even in modules without a + * connection to RESTCONF protocol. The extension allows to define a separated YANG trees usable separately from any + * datastore. + * + * libyang implements support for yang-data internally as an [extension plugin](@ref howtoPluginsExtensions). To ease the + * use of yang-data with libyang, there are several generic functions, which are usable for yang-data: + * + * - ::lyd_parse_ext_data() + * - ::lyd_parse_ext_op() + * + * - ::lys_getnext_ext() + * + * - ::lyd_new_ext_inner() + * - ::lyd_new_ext_list() + * - ::lyd_new_ext_term() + * - ::lyd_new_ext_any() + * - ::lyd_new_ext_path() + * + * @section howtoDataMountpoint mount-point Support + * + * [RFC 8528](https://tools.ietf.org/html/rfc8528) defines mount-point extension in ietf-yang-schema-mount YANG module. + * This extension is supported out-of-the-box but to be able to parse data in a mount point, additional run-time data + * need to be provided by a callback: + * + * - ::ly_ctx_set_ext_data_clb() + * + * The mounted data can be parsed directly from data files or created manually using the standard functions. However, + * note that the mounted data use **their own context** created as needed. For *inline* data this means that any new + * request for a mount-point schema node results in a new context creation because it is impossible to determine + * whether any existing context can be used. Also, all these contexts created for the mounted data are **never** + * freed automatically except when the parent context is being freed. So, to avoid redundant context creation, it is + * always advised to use *shared-schema* for mount-points. + * + * In case it is not possible and *inline* mount point must be defined, it is still possible to avoid creating + * additional contexts. When the top-level node right under a schema node with a mount-point is created, always use + * this node for creation of any descendants. So, when using ::lyd_new_path(), use the node as `parent` and specify + * relative `path`. + */ + +/** + * @page howtoDataManipulation Manipulating Data + * + * There are many functions to create or modify an existing data tree. You can add new nodes, reconnect nodes from + * one tree to another (or e.g. from one list instance to another) or remove nodes. The functions doesn't allow you + * to put a node to a wrong place (by checking the YANG module structure), but not all validation checks can be made directly + * (or you have to make a valid change by multiple tree modifications) when the tree is being changed. Therefore, + * the [validation process](@ref howtoDataValidation) is expected to be invoked after changing the data tree to make sure + * that the changed data tree is valid. + * + * When inserting a node into data tree (no matter if the node already exists, via ::lyd_insert_child() and + * ::lyd_insert_sibling(), or a new node is being created), the node is automatically inserted to the place respecting the + * nodes order from the YANG schema. So the node is not inserted to the end or beginning of the siblings list, but after the + * existing instance of the closest preceding sibling node from the schema. In case the node is opaq (it is not connected + * with any schema node), it is placed to the end of the sibling node in the order they are inserted in. The only situation + * when it is possible to influence the order of the nodes is the order of user-ordered list/leaf-list instances. In such + * a case the ::lyd_insert_after() or ::lyd_insert_before() can be used. + * + * Creating data is generally possible in two ways, they can be combined. You can add nodes one-by-one based on + * the node name and/or its parent (::lyd_new_inner(), ::lyd_new_term(), ::lyd_new_any(), ::lyd_new_list(), ::lyd_new_list2() + * and ::lyd_new_opaq()) or address the nodes using a [simple XPath addressing](@ref howtoXPath) (::lyd_new_path() and + * ::lyd_new_path2()). The latter enables to create a whole path of nodes, requires less information + * about the modified data, and is generally simpler to use. Actually the third way is duplicating the existing data using + * ::lyd_dup_single(), ::lyd_dup_siblings() and ::lyd_dup_meta_single(). + * + * Note, that in case the node is defined in an extension instance, the functions mentioned above do not work until you + * provide parent where the new node is supposed to be inserted. The reason is that all the functions searches for the + * top-level nodes directly inside modules. To create a top-level node defined in an extension instance, use + * ::lyd_new_ext_inner(), ::lyd_new_ext_term(), ::lyd_new_ext_any(), ::lyd_new_ext_list() and ::lyd_new_ext_path() + * functions. + * + * The [metadata](@ref howtoDataMetadata) (and attributes in opaq nodes) can be created with ::lyd_new_meta() + * and ::lyd_new_attr(). + * + * Changing value of a terminal node (leaf, leaf-list) is possible with ::lyd_change_term(). Similarly, the metadata value + * can be changed with ::lyd_change_meta(). Before changing the value, it might be useful to compare the node's value + * with a string value (::lyd_value_compare()) or verify that the new string value is correct for the specific data node + * (::lyd_value_validate()). + * + * Working with two existing subtrees can also be performed two ways. Usually, you would use lyd_insert*() functions. + * They are generally meant for simple inserts of a node into a data tree. For more complicated inserts and when + * merging 2 trees use ::lyd_merge_tree() or ::lyd_merge_siblings(). It offers additional options and is basically a more + * powerful insert. + * + * Besides merging, libyang is also capable to provide information about differences between two data trees. For this purpose, + * ::lyd_diff_tree() and ::lyd_diff_siblings() generates annotated data trees which can be, in addition, used to change one + * data tree to another one using ::lyd_diff_apply_all(), ::lyd_diff_apply_module() and ::lyd_diff_reverse_all(). Multiple + * diff data trees can be also put together for further work using ::lyd_diff_merge_all(), ::lyd_diff_merge_module() and + * ::lyd_diff_merge_tree() functions. To just check equivalence of the data nodes, ::lyd_compare_single(), + * ::lyd_compare_siblings() and ::lyd_compare_meta() can be used. + * + * To remove a node or subtree from a data tree, use ::lyd_unlink_tree() and then free the unwanted data using + * ::lyd_free_all() (or other \b lyd_free_*() functions). + * + * Also remember, that when you are creating/inserting a node, all the objects in that operation must belong to the + * same context. + * + * Modifying the single data tree in multiple threads is not safe. + * + * Functions List + * -------------- + * - ::lyd_new_inner() + * - ::lyd_new_term() + * - ::lyd_new_term_bin() + * - ::lyd_new_term_canon() + * - ::lyd_new_list() + * - ::lyd_new_list_bin() + * - ::lyd_new_list_canon() + * - ::lyd_new_list2() + * - ::lyd_new_any() + * - ::lyd_new_opaq() + * - ::lyd_new_opaq2() + * - ::lyd_new_attr() + * - ::lyd_new_attr2() + * - ::lyd_new_meta() + * - ::lyd_new_path() + * - ::lyd_new_path2() + * + * - ::lyd_new_ext_inner() + * - ::lyd_new_ext_term() + * - ::lyd_new_ext_list() + * - ::lyd_new_ext_any() + * - ::lyd_new_ext_path() + * + * - ::lyd_dup_single() + * - ::lyd_dup_siblings() + * - ::lyd_dup_meta_single() + * + * - ::lyd_insert_child() + * - ::lyd_insert_sibling() + * - ::lyd_insert_after() + * - ::lyd_insert_before() + * + * - ::lyd_value_compare() + * - ::lyd_value_validate() + * + * - ::lyd_change_term() + * - ::lyd_change_term_bin() + * - ::lyd_change_term_canon() + * - ::lyd_change_meta() + * + * - ::lyd_compare_single() + * - ::lyd_compare_siblings() + * - ::lyd_compare_meta() + * - ::lyd_diff_tree() + * - ::lyd_diff_siblings() + * - ::lyd_diff_apply_all() + * - ::lyd_diff_apply_module() + * - ::lyd_diff_reverse_all() + * - ::lyd_diff_merge_all() + * - ::lyd_diff_merge_module() + * - ::lyd_diff_merge_tree() + * + * - ::lyd_merge_tree() + * - ::lyd_merge_siblings() + * - ::lyd_merge_module() + * + * - ::lyd_unlink_tree() + * + * - ::lyd_free_all() + * - ::lyd_free_siblings() + * - ::lyd_free_tree() + * - ::lyd_free_meta_single() + * - ::lyd_free_meta_siblings() + * - ::lyd_free_attr_single() + * - ::lyd_free_attr_siblings() + * + * - ::lyd_any_value_str() + * - ::lyd_any_copy_value() + */ + +/** + * @page howtoDataWD Default Values + * + * libyang provides support for work with default values as defined in [RFC 6243](https://tools.ietf.org/html/rfc6243). + * However, libyang context do not contains the *ietf-netconf-with-defaults* module on its own and caller is supposed to + * add this YANG module to enable full support of the *with-defaults* features described below. Without presence of the + * mentioned module in the context, the default nodes are still present and handled in the data trees, but the metadata + * providing the information about the default values cannot be used. It means that when parsing data, the default nodes + * marked with the metadata as implicit default nodes are handled as explicit data and when printing data tree, the expected + * nodes are printed without the ietf-netconf-with-defaults metadata. + * + * The RFC document defines 4 modes for handling default nodes in a data tree, libyang adds the fifth mode and use them + * via @ref dataprinterflags when printing data trees. + * - \b explicit - Only the explicitly set configuration data. But in the case of status data, missing default + * data are added into the tree. In libyang, this mode is represented by ::LYD_PRINT_WD_EXPLICIT option. + * This is the default with-defaults mode of the printer. The data nodes do not contain any additional + * metadata information. + * - \b trim - Data nodes containing the default value are removed. This mode is applied with ::LYD_PRINT_WD_TRIM option. + * - \b report-all - This mode provides all the default data nodes despite they were explicitly present in source data or + * they were added by libyang's [validation process](@ref howtoDataValidation). This mode is activated by + * ::LYD_PRINT_WD_ALL option. + * - \b report-all-tagged - In this case, all the data nodes (implicit as well the explicit) containing the default value + * are printed and tagged (see the note below). Printers accept ::LYD_PRINT_WD_ALL_TAG option for this mode. + * - \b report-implicit-tagged - The last mode is similar to the previous one, except only the implicitly added nodes + * are tagged. This is the libyang's extension and it is activated by ::LYD_PRINT_WD_IMPL_TAG option. + * + * Internally, libyang adds the default nodes into the data tree as part of the [validation process](@ref howtoDataValidation). + * When [parsing data](@ref howtoDataParsers) from an input source, adding default nodes can be avoided only by avoiding + * the whole [validation process](@ref howtoDataValidation). In case the ietf-netconf-with-defaults module is present in the + * context, the [parser process](@ref howtoDataParsers) also supports to recognize the implicit default nodes marked with the + * appropriate metadata. + * + * Note, that in a modified data tree (via e.g. \b lyd_insert_*() or \b lyd_free_*() functions), some of the default nodes + * can be missing or they can be present by mistake. Such a data tree is again corrected during the next run of the + * [validation process](@ref howtoDataValidation) or manualy using \b lyd_new_implicit_*() functions. + * + * The implicit (default) nodes, created by libyang, are marked with the ::LYD_DEFAULT flag in ::lyd_node.flags member + * Note, that besides leafs and leaf-lists, the flag can appear also in containers, where it means that the container + * holds only a default node(s) or it is implicitly added empty container (according to YANG 1.1 spec, all such containers are part of + * the accessible data tree). When printing data trees, the presence of empty containers (despite they were added + * explicitly or implicitly as part of accessible data tree) depends on ::LYD_PRINT_KEEPEMPTYCONT option. + * + * To get know if the particular leaf or leaf-list node contains default value (despite implicit or explicit), you can + * use ::lyd_is_default() function. + * + * Functions List + * -------------- + * - ::lyd_is_default() + * - ::lyd_new_implicit_all() + * - ::lyd_new_implicit_module() + * - ::lyd_new_implicit_tree() + */ + +/** + * @page howtoDataLYB LYB Binary Format + * + * LYB (LibYang Binary) is a proprietary libyang binary data and file format. Its primary purpose is efficient + * serialization (printing) and deserialization (parsing). With this goal in mind, every term node value is stored + * in its new binary format specification according to its type. Following is the format for all types with explicit + * support out-of-the-box (meaning that have a special type plugin). Any derived types inherit the format of its + * closest type with explicit support (up to a built-in type). + * + * @section howtoDataLYBTypes Format of specific data type values + */ + +/** + * @ingroup trees + * @defgroup datatree Data Tree + * @{ + * + * Data structures and functions to manipulate and access instance data tree. + */ + +/* *INDENT-OFF* */ + +/** + * @brief Macro to iterate via all elements in a data tree. This is the opening part + * to the #LYD_TREE_DFS_END - they always have to be used together. + * + * The function follows deep-first search algorithm: + * <pre> + * 1 + * / \ + * 2 4 + * / / \ + * 3 5 6 + * </pre> + * + * Use the same parameters for #LYD_TREE_DFS_BEGIN and #LYD_TREE_DFS_END. While + * START can be any of the lyd_node* types, ELEM variable must be a pointer to + * the generic struct lyd_node. + * + * To skip a particular subtree, instead of the continue statement, set LYD_TREE_DFS_continue + * variable to non-zero value. + * + * Use with opening curly bracket '{' after the macro. + * + * @param START Pointer to the starting element processed first. + * @param ELEM Iterator intended for use in the block. + */ +#define LYD_TREE_DFS_BEGIN(START, ELEM) \ + { ly_bool LYD_TREE_DFS_continue = 0; struct lyd_node *LYD_TREE_DFS_next; \ + for ((ELEM) = (LYD_TREE_DFS_next) = (struct lyd_node *)(START); \ + (ELEM); \ + (ELEM) = (LYD_TREE_DFS_next), LYD_TREE_DFS_continue = 0) + +/** + * @brief Macro to iterate via all elements in a tree. This is the closing part + * to the #LYD_TREE_DFS_BEGIN - they always have to be used together. + * + * Use the same parameters for #LYD_TREE_DFS_BEGIN and #LYD_TREE_DFS_END. While + * START can be any of the lyd_node* types, ELEM variable must be a pointer + * to the generic struct lyd_node. + * + * Use with closing curly bracket '}' after the macro. + * + * @param START Pointer to the starting element processed first. + * @param ELEM Iterator intended for use in the block. + */ + +#define LYD_TREE_DFS_END(START, ELEM) \ + /* select element for the next run - children first */ \ + if (LYD_TREE_DFS_continue) { \ + (LYD_TREE_DFS_next) = NULL; \ + } else { \ + (LYD_TREE_DFS_next) = lyd_child(ELEM); \ + }\ + if (!(LYD_TREE_DFS_next)) { \ + /* no children */ \ + if ((ELEM) == (struct lyd_node *)(START)) { \ + /* we are done, (START) has no children */ \ + break; \ + } \ + /* try siblings */ \ + (LYD_TREE_DFS_next) = (ELEM)->next; \ + } \ + while (!(LYD_TREE_DFS_next)) { \ + /* parent is already processed, go to its sibling */ \ + (ELEM) = (struct lyd_node *)(ELEM)->parent; \ + /* no siblings, go back through parents */ \ + if ((ELEM)->parent == (START)->parent) { \ + /* we are done, no next element to process */ \ + break; \ + } \ + (LYD_TREE_DFS_next) = (ELEM)->next; \ + } } + +/** + * @brief Macro to iterate via all schema node data instances in data siblings. + * + * @param START Pointer to the starting sibling. Even if it is not first, all the siblings are searched. + * @param SCHEMA Schema node of the searched instances. + * @param ELEM Iterator. + */ +#define LYD_LIST_FOR_INST(START, SCHEMA, ELEM) \ + for (lyd_find_sibling_val(START, SCHEMA, NULL, 0, &(ELEM)); \ + (ELEM) && ((ELEM)->schema == (SCHEMA)); \ + (ELEM) = (ELEM)->next) + +/** + * @brief Macro to iterate via all schema node data instances in data siblings allowing to modify the list itself. + * + * @param START Pointer to the starting sibling. Even if it is not first, all the siblings are searched. + * @param SCHEMA Schema node of the searched instances. + * @param NEXT Temporary storage to allow removing of the current iterator content. + * @param ELEM Iterator. + */ +#define LYD_LIST_FOR_INST_SAFE(START, SCHEMA, NEXT, ELEM) \ + for ((NEXT) = (ELEM) = NULL, lyd_find_sibling_val(START, SCHEMA, NULL, 0, &(ELEM)); \ + (ELEM) && ((ELEM)->schema == (SCHEMA)) ? ((NEXT) = (ELEM)->next, 1) : 0; \ + (ELEM) = (NEXT)) + +/* *INDENT-ON* */ + +/** + * @brief Macro to get context from a data tree node. + */ +#define LYD_CTX(node) ((node)->schema ? (node)->schema->module->ctx : ((const struct lyd_node_opaq *)(node))->ctx) + +/** + * @brief Data input/output formats supported by libyang [parser](@ref howtoDataParsers) and + * [printer](@ref howtoDataPrinters) functions. + */ +typedef enum { + LYD_UNKNOWN = 0, /**< unknown data format, invalid value */ + LYD_XML, /**< XML instance data format */ + LYD_JSON, /**< JSON instance data format */ + LYD_LYB /**< LYB instance data format */ +} LYD_FORMAT; + +/** + * @brief List of possible value types stored in ::lyd_node_any. + */ +typedef enum { + LYD_ANYDATA_DATATREE, /**< Value is a pointer to ::lyd_node structure (first sibling). When provided as input parameter, the pointer + 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_all() on the provided data) */ + LYD_ANYDATA_STRING, /**< Value is a generic string without any knowledge about its format (e.g. anyxml value in JSON encoded + as string). XML sensitive characters (such as & or \>) are automatically escaped when the anydata + is printed in XML format. */ + LYD_ANYDATA_XML, /**< Value is a string containing the serialized XML data. */ + LYD_ANYDATA_JSON, /**< Value is a string containing the data modeled by YANG and encoded as I-JSON. */ + LYD_ANYDATA_LYB /**< Value is a memory chunk with the serialized data tree in LYB format. */ +} LYD_ANYDATA_VALUETYPE; + +/** @} */ + +/** + * @brief YANG data representation + */ +struct lyd_value { + const char *_canonical; /**< Should never be accessed directly, instead ::lyd_get_value() and ::lyd_get_meta_value() + should be used. Serves as a cache for the canonical value or the JSON + representation if no canonical value is defined. */ + const struct lysc_type *realtype; /**< pointer to the real type of the data stored in the value structure. This type can differ from the type + in the schema node of the data node since the type's store plugin can use other types/plugins for + storing data. Speaking about built-in types, this is the case of leafref which stores data as its + target type. In contrast, union type also uses its subtype's callbacks, but inside an internal data + stored in subvalue member of ::lyd_value structure, so here is the pointer to the union type. + In general, this type is used to get free callback for this lyd_value structure, so it must reflect + the type used to store data directly in the same lyd_value instance. */ + + union { + int8_t boolean; /**< 0 as false, 1 as true */ + int64_t dec64; /**< decimal64: value = dec64 / 10^fraction-digits */ + 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 */ + uint8_t uint8; /**< 8-bit unsigned integer */ + uint16_t uint16; /**< 16-bit unsigned integer */ + uint32_t uint32; /**< 32-bit unsigned integer */ + uint64_t uint64; /**< 64-bit unsigned integer */ + struct lysc_type_bitenum_item *enum_item; /**< pointer to the definition of the enumeration value */ + struct lysc_ident *ident; /**< pointer to the schema definition of the identityref value */ + struct ly_path *target; /**< Instance-identifier target path, use ::lyd_find_target() to evaluate + it on data. */ + struct lyd_value_union *subvalue; /** Union value with some metadata. */ + + void *dyn_mem; /**< pointer to generic data type value stored in dynamic memory */ + uint8_t fixed_mem[LYD_VALUE_FIXED_MEM_SIZE]; /**< fixed-size buffer for a generic data type value */ + }; /**< The union is just a list of shorthands to possible values stored by a type's plugin. libyang itself uses the ::lyd_value.realtype + plugin's callbacks to work with the data.*/ +}; + +/** + * @brief Get the value in format specific to the type. + * + * Should be used for any types that do not have their specific representation in the ::lyd_value union. + * + * @param[in] value Pointer to the value structure to read from (struct ::lyd_value *). + * @param[out] type_val Pointer to the type-specific value structure. + */ +#define LYD_VALUE_GET(value, type_val) \ + ((sizeof *(type_val) > LYD_VALUE_FIXED_MEM_SIZE) \ + ? ((type_val) = (((value)->dyn_mem))) \ + : ((type_val) = ((void *)((value)->fixed_mem)))) + +/** + * @brief Special lyd_value structure for built-in union values. + * + * Represents data with multiple types (union). The ::lyd_value_union.value contains representation according to + * one of the union's types. The ::lyd_value_union.prefix_data provides (possible) mappings from prefixes in + * the original value to YANG modules. These prefixes are necessary to parse original value to the union's subtypes. + */ +struct lyd_value_union { + struct lyd_value value; /**< representation of the value according to the selected union's subtype + (stored as ::lyd_value.realtype here) */ + void *original; /**< Original value. */ + size_t orig_len; /**< Original value length. */ + uint32_t hints; /**< [Value hints](@ref lydvalhints) from the parser */ + LY_VALUE_FORMAT format; /**< Prefix format of the value. However, this information is also used to decide + whether a value is valid for the specific format or not on later validations + (instance-identifier in XML looks different than in JSON). */ + void *prefix_data; /**< Format-specific data for prefix resolution (see ly_resolve_prefix()) */ + const struct lysc_node *ctx_node; /**< Context schema node. */ +}; + +/** + * @brief Special lyd_value structure for built-in bits values. + */ +struct lyd_value_bits { + char *bitmap; /**< bitmap of size ::lyplg_type_bits_bitmap_size(), if its value is + cast to an integer type of the corresponding size, can be used + directly as a bitmap */ + struct lysc_type_bitenum_item **items; /**< list of set pointers to the specification of the set + bits ([sized array](@ref sizedarrays)) */ +}; + +/** + * @brief Special lyd_value structure for built-in binary values. + */ +struct lyd_value_binary { + void *data; /**< pointer to the binary value */ + size_t size; /**< size of @p data value in bytes */ +}; + +/** + * @brief Special lyd_value structure for ietf-inet-types ipv4-address-no-zone values. + */ +struct lyd_value_ipv4_address_no_zone { + struct in_addr addr; /**< IPv4 address in binary */ +}; + +/** + * @brief Special lyd_value structure for ietf-inet-types ipv4-address values. + */ +struct lyd_value_ipv4_address { + struct in_addr addr; /**< IPv4 address in binary */ + const char *zone; /**< Optional address zone */ +}; + +/** + * @brief Special lyd_value structure for ietf-inet-types ipv4-prefix values. + */ +struct lyd_value_ipv4_prefix { + struct in_addr addr; /**< IPv4 host address in binary */ + uint8_t prefix; /**< prefix length (0 - 32) */ +}; + +/** + * @brief Special lyd_value structure for ietf-inet-types ipv6-address-no-zone values. + */ +struct lyd_value_ipv6_address_no_zone { + struct in6_addr addr; /**< IPv6 address in binary */ +}; + +/** + * @brief Special lyd_value structure for ietf-inet-types ipv6-address values. + */ +struct lyd_value_ipv6_address { + struct in6_addr addr; /**< IPv6 address in binary */ + const char *zone; /**< Optional address zone */ +}; + +/** + * @brief Special lyd_value structure for ietf-inet-types ipv6-prefix values. + */ +struct lyd_value_ipv6_prefix { + struct in6_addr addr; /**< IPv6 host address in binary */ + uint8_t prefix; /**< prefix length (0 - 128) */ +}; + +/** + * @brief Special lyd_value structure for ietf-yang-types date-and-time values. + */ +struct lyd_value_date_and_time { + time_t time; /**< UNIX timestamp */ + char *fractions_s; /**< Optional fractions of a second */ + ly_bool unknown_tz; /**< Whether the value is in the special -00:00 timezone. */ +}; + +/** + * @brief Special lyd_value structure for ietf-yang-types xpath1.0 values. + */ +struct lyd_value_xpath10 { + struct lyxp_expr *exp; + const struct ly_ctx *ctx; + void *prefix_data; + LY_VALUE_FORMAT format; +}; + +/** + * @brief Generic prefix and namespace mapping, meaning depends on the format. + * + * The union is used as a reference to the data's module and according to the format, it can be used as a key for + * ::ly_ctx_get_module_implemented_ns() or ::ly_ctx_get_module_implemented(). While the module reference is always present, + * the prefix member can be omitted in case it is not present in the source data as a reference to the default module/namespace. + */ +struct ly_opaq_name { + const char *name; /**< node name, without prefix if any was defined */ + const char *prefix; /**< identifier used in the qualified name as the prefix, can be NULL */ + + union { + const char *module_ns; /**< format ::LY_VALUE_XML - XML namespace of the node element */ + const char *module_name; /**< format ::LY_VALUE_JSON - (inherited) name of the module of the element */ + }; +}; + +/** + * @brief Generic attribute structure. + */ +struct lyd_attr { + struct lyd_node_opaq *parent; /**< data node where the attribute is placed */ + struct lyd_attr *next; /**< pointer to the next attribute */ + struct ly_opaq_name name; /**< attribute name with module information */ + const char *value; /**< attribute value */ + uint32_t hints; /**< additional information about from the data source, see the [hints list](@ref lydhints) */ + LY_VALUE_FORMAT format; /**< format of the attribute and any prefixes, ::LY_VALUE_XML or ::LY_VALUE_JSON */ + void *val_prefix_data; /**< format-specific prefix data */ +}; + +#define LYD_NODE_INNER (LYS_CONTAINER|LYS_LIST|LYS_RPC|LYS_ACTION|LYS_NOTIF) /**< Schema nodetype mask for lyd_node_inner */ +#define LYD_NODE_TERM (LYS_LEAF|LYS_LEAFLIST) /**< Schema nodetype mask for lyd_node_term */ +#define LYD_NODE_ANY (LYS_ANYDATA) /**< Schema nodetype mask for lyd_node_any */ + +/** + * @ingroup datatree + * @defgroup dnodeflags Data node flags + * @{ + * + * Various flags of data nodes. + * + * 1 - container 5 - anydata/anyxml + * 2 - list 6 - rpc/action + * 3 - leaf 7 - notification + * 4 - leaflist + * + * bit name 1 2 3 4 5 6 7 + * ---------------------+-+-+-+-+-+-+-+ + * 1 LYD_DEFAULT |x| |x|x| | | | + * +-+-+-+-+-+-+-+ + * 2 LYD_WHEN_TRUE |x|x|x|x|x| | | + * +-+-+-+-+-+-+-+ + * 3 LYD_NEW |x|x|x|x|x|x|x| + * +-+-+-+-+-+-+-+ + * 4 LYD_EXT |x|x|x|x|x|x|x| + * ---------------------+-+-+-+-+-+-+-+ + * + */ + +#define LYD_DEFAULT 0x01 /**< default (implicit) node */ +#define LYD_WHEN_TRUE 0x02 /**< all when conditions of this node were evaluated to true */ +#define LYD_NEW 0x04 /**< node was created after the last validation, is needed for the next validation */ +#define LYD_EXT 0x08 /**< node is the first sibling parsed as extension instance data */ + +/** @} */ + +/** + * @brief Generic structure for a data node. + */ +struct lyd_node { + uint32_t hash; /**< hash of this particular node (module name + schema name + key string values if list or + hashes of all nodes of subtree in case of keyless list). Note that while hash can be + used to get know that nodes are not equal, it cannot be used to decide that the + nodes are equal due to possible collisions. */ + uint32_t flags; /**< [data node flags](@ref dnodeflags) */ + const struct lysc_node *schema; /**< pointer to the schema definition of this node */ + struct lyd_node_inner *parent; /**< pointer to the parent node, NULL in case of root 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_meta *meta; /**< pointer to the list of metadata of this node */ + void *priv; /**< private user data, not used by libyang */ +}; + +/** + * @brief Data node structure for the inner data tree nodes - containers, lists, RPCs, actions and Notifications. + */ +struct lyd_node_inner { + union { + struct lyd_node node; /**< implicit cast for the members compatible with ::lyd_node */ + + struct { + uint32_t hash; /**< hash of this particular node (module name + schema name + key string + values if list or hashes of all nodes of subtree in case of keyless + list). Note that while hash can be used to get know that nodes are + not equal, it cannot be used to decide that the nodes are equal due + to possible collisions. */ + uint32_t flags; /**< [data node flags](@ref dnodeflags) */ + const struct lysc_node *schema; /**< pointer to the schema definition of this node */ + struct lyd_node_inner *parent; /**< pointer to the parent node, NULL in case of root 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_meta *meta; /**< pointer to the list of metadata of this node */ + void *priv; /**< private user data, not used by libyang */ + }; + }; /**< common part corresponding to ::lyd_node */ + + struct lyd_node *child; /**< pointer to the first child node. */ + struct hash_table *children_ht; /**< hash table with all the direct children (except keys for a list, lists without keys) */ + +#define LYD_HT_MIN_ITEMS 4 /**< minimal number of children to create ::lyd_node_inner.children_ht hash table. */ +}; + +/** + * @brief Data node structure for the terminal data tree nodes - leaves and leaf-lists. + */ +struct lyd_node_term { + union { + struct lyd_node node; /**< implicit cast for the members compatible with ::lyd_node */ + + struct { + uint32_t hash; /**< hash of this particular node (module name + schema name + key string + values if list or hashes of all nodes of subtree in case of keyless + list). Note that while hash can be used to get know that nodes are + not equal, it cannot be used to decide that the nodes are equal due + to possible collisions. */ + uint32_t flags; /**< [data node flags](@ref dnodeflags) */ + const struct lysc_node *schema; /**< pointer to the schema definition of this node */ + struct lyd_node_inner *parent; /**< pointer to the parent node, NULL in case of root 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_meta *meta; /**< pointer to the list of metadata of this node */ + void *priv; /**< private user data, not used by libyang */ + }; + }; /**< common part corresponding to ::lyd_node */ + + struct lyd_value value; /**< node's value representation */ +}; + +/** + * @brief union for anydata/anyxml value representation. + */ +union lyd_any_value { + struct lyd_node *tree; /**< data tree */ + const char *str; /**< Generic string data */ + const char *xml; /**< Serialized XML data */ + const char *json; /**< I-JSON encoded string */ + char *mem; /**< LYD_ANYDATA_LYB memory chunk */ +}; + +/** + * @brief Data node structure for the anydata data tree nodes - anydata or + * anyxml. + */ +struct lyd_node_any { + union { + struct lyd_node node; /**< implicit cast for the members compatible with ::lyd_node */ + + struct { + uint32_t hash; /**< hash of this particular node (module name + schema name + key string + values if list or hashes of all nodes of subtree in case of keyless + list). Note that while hash can be used to get know that nodes are + not equal, it cannot be used to decide that the nodes are equal due + to possible collisions. */ + uint32_t flags; /**< [data node flags](@ref dnodeflags) */ + const struct lysc_node *schema; /**< pointer to the schema definition of this node */ + struct lyd_node_inner *parent; /**< pointer to the parent node, NULL in case of root 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_meta *meta; /**< pointer to the list of metadata of this node */ + void *priv; /**< private user data, not used by libyang */ + }; + }; /**< common part corresponding to ::lyd_node */ + + union lyd_any_value value; /**< pointer to the stored value representation of the anydata/anyxml node */ + LYD_ANYDATA_VALUETYPE value_type; /**< type of the data stored as ::lyd_node_any.value */ +}; + +/** + * @brief Get the name (associated with) of a data node. Works for opaque nodes as well. + * + * @param[in] node Node to examine. + * @return Data node name. + */ +#define LYD_NAME(node) ((node)->schema ? (node)->schema->name : ((struct lyd_node_opaq *)node)->name.name) + +/** + * @ingroup datatree + * @defgroup lydvalhints Value format hints. + * @{ + * + * Hints for the type of the data value. + * + * Any information about value types encoded in the format is hinted by these values. + */ +#define LYD_VALHINT_STRING 0x0001 /**< value is allowed to be a string */ +#define LYD_VALHINT_DECNUM 0x0002 /**< value is allowed to be a decimal number */ +#define LYD_VALHINT_OCTNUM 0x0004 /**< value is allowed to be an octal number */ +#define LYD_VALHINT_HEXNUM 0x0008 /**< value is allowed to be a hexadecimal number */ +#define LYD_VALHINT_NUM64 0x0010 /**< value is allowed to be an int64 or uint64 */ +#define LYD_VALHINT_BOOLEAN 0x0020 /**< value is allowed to be a boolean */ +#define LYD_VALHINT_EMPTY 0x0040 /**< value is allowed to be empty */ +/** + * @} lydvalhints + */ + +/** + * @ingroup datatree + * @defgroup lydnodehints Node type format hints + * @{ + * + * Hints for the type of the data node. + * + * Any information about node types encoded in the format is hinted by these values. + */ +#define LYD_NODEHINT_LIST 0x0080 /**< node is allowed to be a list instance */ +#define LYD_NODEHINT_LEAFLIST 0x0100 /**< node is allowed to be a leaf-list instance */ +/** + * @} lydnodehints + */ + +/** + * @ingroup datatree + * @defgroup lydhints Value and node type format hints + * @{ + * + * Hints for the types of data node and its value. + * + * Any information about value and node types encoded in the format is hinted by these values. + * It combines [value hints](@ref lydvalhints) and [node hints](@ref lydnodehints). + */ +#define LYD_HINT_DATA 0x01F3 /**< special node/value hint to be used for generic data node/value (for cases when + there is no encoding or it does not provide any additional information about + a node/value type); do not combine with specific [value hints](@ref lydvalhints) + or [node hints](@ref lydnodehints). */ +#define LYD_HINT_SCHEMA 0x01FF /**< special node/value hint to be used for generic schema node/value(for cases when + there is no encoding or it does not provide any additional information about + a node/value type); do not combine with specific [value hints](@ref lydvalhints) + or [node hints](@ref lydnodehints). */ +/** + * @} lydhints + */ + +/** + * @brief Data node structure for unparsed (opaque) nodes. + */ +struct lyd_node_opaq { + union { + struct lyd_node node; /**< implicit cast for the members compatible with ::lyd_node */ + + struct { + uint32_t hash; /**< always 0 */ + uint32_t flags; /**< always 0 */ + const struct lysc_node *schema; /**< always NULL */ + struct lyd_node_inner *parent; /**< pointer to the parent node, NULL in case of root 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_meta *meta; /**< always NULL */ + void *priv; /**< private user data, not used by libyang */ + }; + }; /**< common part corresponding to ::lyd_node */ + + struct lyd_node *child; /**< pointer to the child node (compatible with ::lyd_node_inner) */ + + struct ly_opaq_name name; /**< node name with module information */ + const char *value; /**< original value */ + uint32_t hints; /**< additional information about from the data source, see the [hints list](@ref lydhints) */ + LY_VALUE_FORMAT format; /**< format of the node and any prefixes, ::LY_VALUE_XML or ::LY_VALUE_JSON */ + void *val_prefix_data; /**< format-specific prefix data */ + + struct lyd_attr *attr; /**< pointer to the list of generic attributes of this node */ + const struct ly_ctx *ctx; /**< libyang context */ +}; + +/** + * @brief Get the generic parent pointer of a data node. + * + * @param[in] node Node whose parent pointer to get. + * @return Pointer to the parent node of the @p node. + * @return NULL in case of the top-level node or if the @p node is NULL itself. + */ +static inline struct lyd_node * +lyd_parent(const struct lyd_node *node) +{ + if (!node || !node->parent) { + return NULL; + } + + return &node->parent->node; +} + +/** + * @brief Get the child pointer of a generic data node. + * + * Decides the node's type and in case it has a children list, returns it. Supports even the opaq nodes (::lyd_node_opaq). + * + * If you need to skip key children, use ::lyd_child_no_keys(). + * + * @param[in] node Node to use. + * @return Pointer to the first child node (if any) of the @p node. + */ +static inline struct lyd_node * +lyd_child(const struct lyd_node *node) +{ + if (!node) { + return NULL; + } + + if (!node->schema) { + /* opaq node */ + return ((const struct lyd_node_opaq *)node)->child; + } + + switch (node->schema->nodetype) { + case LYS_CONTAINER: + case LYS_LIST: + case LYS_RPC: + case LYS_ACTION: + case LYS_NOTIF: + return ((const struct lyd_node_inner *)node)->child; + default: + return NULL; + } +} + +/** + * @brief Get the child pointer of a generic data node but skip its keys in case it is ::LYS_LIST. + * + * Decides the node's type and in case it has a children list, returns it. Supports even the opaq nodes (::lyd_node_opaq). + * + * If you need to take key children into account, use ::lyd_child(). + * + * @param[in] node Node to use. + * @return Pointer to the first child node (if any) of the @p node. + */ +LIBYANG_API_DECL struct lyd_node *lyd_child_no_keys(const struct lyd_node *node); + +/** + * @brief Get the owner module of the data node. It is the module of the top-level schema node. Generally, + * in case of augments it is the target module, recursively, otherwise it is the module where the data node is defined. + * + * Also works for opaque nodes, if it is possible to resolve the module. + * + * @param[in] node Data node to examine. + * @return Module owner of the node. + */ +LIBYANG_API_DECL const struct lys_module *lyd_owner_module(const struct lyd_node *node); + +/** + * @brief Check whether a node value equals to its default one. + * + * @param[in] node Term node to test. + * @return false (no, it is not a default node) or true (yes, it is default) + */ +LIBYANG_API_DECL ly_bool lyd_is_default(const struct lyd_node *node); + +/** + * @brief Learn the relative position of a list or leaf-list instance within other instances of the same schema node. + * + * @param[in] instance List or leaf-list instance to get the position of. + * @return 0 on error. + * @return Positive integer of the @p instance position. + */ +LIBYANG_API_DECL uint32_t lyd_list_pos(const struct lyd_node *instance); + +/** + * @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. + */ +LIBYANG_API_DECL struct lyd_node *lyd_first_sibling(const struct lyd_node *node); + +/** + * @brief Learn the length of LYB data. + * + * @param[in] data LYB data to examine. + * @return Length of the LYB data chunk, + * @return -1 on error. + */ +LIBYANG_API_DECL int lyd_lyb_data_length(const char *data); + +/** + * @brief Check node parsed into an opaque node for the reason (error) why it could not be parsed as data node. + * + * The node is expected to be produced by a parser and must either have no parent or a data node parent (not opaque). + * + * @param[in] node Opaque node to check. + * @return LY_EINVAL if @p node is in some way unexpected (even valid); + * @return LY_ERR value of the reason. + */ +LIBYANG_API_DECL LY_ERR lyd_parse_opaq_error(const struct lyd_node *node); + +/** + * @brief Get the (canonical) value of a lyd_value. + * + * Whenever possible, ::lyd_get_value() or ::lyd_get_meta_value() should be used instead. + * + * @param[in] ctx Context for the value + * @param[in] value Value structure to use. + * @return Canonical value. + */ +LIBYANG_API_DECL const char *lyd_value_get_canonical(const struct ly_ctx *ctx, const struct lyd_value *value); + +/** + * @brief Get the (canonical) value of a data node. + * + * @param[in] node Data node to use. + * @return Canonical value. + */ +static inline const char * +lyd_get_value(const struct lyd_node *node) +{ + if (!node) { + return NULL; + } + + if (!node->schema) { + return ((const struct lyd_node_opaq *)node)->value; + } else if (node->schema->nodetype & LYD_NODE_TERM) { + const struct lyd_value *value = &((const struct lyd_node_term *)node)->value; + + return value->_canonical ? value->_canonical : lyd_value_get_canonical(LYD_CTX(node), value); + } + + return NULL; +} + +/** + * @brief Get anydata string value. + * + * @param[in] any Anyxml/anydata node to read from. + * @param[out] value_str String representation of the value. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_any_value_str(const struct lyd_node *any, char **value_str); + +/** + * @brief Copy anydata value from one node to another. Target value is freed first. + * + * @param[in,out] trg Target node. + * @param[in] value Source value, may be NULL when the target value is only freed. + * @param[in] value_type Source value type. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_any_copy_value(struct lyd_node *trg, const union lyd_any_value *value, + LYD_ANYDATA_VALUETYPE value_type); + +/** + * @brief Create a new inner node in the data tree. + * + * To create list, use ::lyd_new_list() or ::lyd_new_list2(). + * + * To create a top-level inner node defined in an extension instance, use ::lyd_new_ext_inner(). + * + * @param[in] parent Parent node for the node being created. NULL in case of creating a top level element. + * @param[in] module Module of the node being created. If NULL, @p parent module will be used. + * @param[in] name Schema node name of the new data node. The node can be #LYS_CONTAINER, #LYS_NOTIF, #LYS_RPC, or #LYS_ACTION. + * @param[in] output Flag in case the @p parent is RPC/Action. If value is 0, the input's data nodes of the RPC/Action are + * taken into consideration. Otherwise, the output's data node is going to be created. + * @param[out] node Optional created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_inner(struct lyd_node *parent, const struct lys_module *module, const char *name, + ly_bool output, struct lyd_node **node); + +/** + * @brief Create a new top-level inner node defined in the given extension instance. + * + * To create list, use ::lyd_new_list() or ::lyd_new_list2(). + * + * To create an inner node with parent (no matter if defined inside extension instance or a standard tree) or a top-level + * node of a standard module's tree, use ::lyd_new_inner(). + * + * @param[in] ext Extension instance where the inner node being created is defined. + * @param[in] name Schema node name of the new data node. The node can be #LYS_CONTAINER, #LYS_NOTIF, #LYS_RPC, or #LYS_ACTION. + * @param[out] node The created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_ext_inner(const struct lysc_ext_instance *ext, const char *name, struct lyd_node **node); + +/** + * @brief Create a new list node in the data tree. + * + * @param[in] parent Parent node for the node being created. NULL in case of creating a top level element. + * @param[in] module Module of the node being created. If NULL, @p parent module will be used. + * @param[in] name Schema node name of the new data node. The node must be #LYS_LIST. + * @param[in] output Flag in case the @p parent is RPC/Action. If value is 0, the input's data nodes of the RPC/Action are + * taken into consideration. Otherwise, the output's data node is going to be created. + * @param[out] node Optional created node. + * @param[in] ... Ordered key values of the new list instance, all must be set. In case of an instance-identifier + * or identityref value, the JSON format is expected (module names instead of prefixes). No keys are expected for + * key-less lists. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_list(struct lyd_node *parent, const struct lys_module *module, const char *name, + ly_bool output, struct lyd_node **node, ...); + +/** + * @brief Create a new list node in the data tree. + * + * @param[in] parent Parent node for the node being created. NULL in case of creating a top level element. + * @param[in] module Module of the node being created. If NULL, @p parent module will be used. + * @param[in] name Schema node name of the new data node. The node must be #LYS_LIST. + * @param[in] output Flag in case the @p parent is RPC/Action. If value is 0, the input's data nodes of the RPC/Action are + * taken into consideration. Otherwise, the output's data node is going to be created. + * @param[out] node Optional created node. + * @param[in] ... Ordered binary key values of the new list instance, all must be set. Every key value must be followed + * by its length. No keys are expected for key-less lists. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_list_bin(struct lyd_node *parent, const struct lys_module *module, const char *name, + ly_bool output, struct lyd_node **node, ...); + +/** + * @brief Create a new list node in the data tree. + * + * @param[in] parent Parent node for the node being created. NULL in case of creating a top level element. + * @param[in] module Module of the node being created. If NULL, @p parent module will be used. + * @param[in] name Schema node name of the new data node. The node must be #LYS_LIST. + * @param[in] output Flag in case the @p parent is RPC/Action. If value is 0, the input's data nodes of the RPC/Action are + * taken into consideration. Otherwise, the output's data node is going to be created. + * @param[out] node Optional created node. + * @param[in] ... Ordered canonical key values of the new list instance, all must be set. No keys are expected for + * key-less lists. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_list_canon(struct lyd_node *parent, const struct lys_module *module, const char *name, + ly_bool output, struct lyd_node **node, ...); + +/** + * @brief Create a new top-level list node defined in the given extension instance. + * + * To create a list node with parent (no matter if defined inside extension instance or a standard tree) or a top-level + * list node of a standard module's tree, use ::lyd_new_list() or ::lyd_new_list2(). + * + * @param[in] ext Extension instance where the list node being created is defined. + * @param[in] name Schema node name of the new data node. The node must be #LYS_LIST. + * @param[out] node The created node. + * @param[in] ... Ordered key values of the new list instance, all must be set. In case of an instance-identifier + * or identityref value, the JSON format is expected (module names instead of prefixes). No keys are expected for + * key-less lists. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_ext_list(const struct lysc_ext_instance *ext, const char *name, struct lyd_node **node, ...); + +/** + * @brief Create a new list node in the data tree. + * + * @param[in] parent Parent node for the node being created. NULL in case of creating a top level element. + * @param[in] module Module of the node being created. If NULL, @p parent module will be used. + * @param[in] name Schema node name of the new data node. The node must be #LYS_LIST. + * @param[in] keys All key values predicate in the form of "[key1='val1'][key2='val2']...", they do not have to be ordered. + * In case of an instance-identifier or identityref value, the JSON format is expected (module names instead of prefixes). + * Use NULL or string of length 0 in case of key-less list. + * @param[in] output Flag in case the @p parent is RPC/Action. If value is 0, the input's data nodes of the RPC/Action are + * taken into consideration. Otherwise, the output's data node is going to be created. + * @param[out] node Optional created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_list2(struct lyd_node *parent, const struct lys_module *module, const char *name, + const char *keys, ly_bool output, struct lyd_node **node); + +/** + * @brief Create a new term node in the data tree. + * + * To create a top-level term node defined in an extension instance, use ::lyd_new_ext_term(). + * + * @param[in] parent Parent node for the node being created. NULL in case of creating a top level element. + * @param[in] module Module of the node being created. If NULL, @p parent module will be used. + * @param[in] name Schema node name of the new data node. The node can be #LYS_LEAF or #LYS_LEAFLIST. + * @param[in] val_str String value of the node. If it varies based on the format, ::LY_VALUE_JSON is expected. + * @param[in] output Flag in case the @p parent is RPC/Action. If value is 0, the input's data nodes of the RPC/Action are + * taken into consideration. Otherwise, the output's data node is going to be created. + * @param[out] node Optional created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_term(struct lyd_node *parent, const struct lys_module *module, const char *name, + const char *val_str, ly_bool output, struct lyd_node **node); + +/** + * @brief Create a new term node in the data tree. + * + * @param[in] parent Parent node for the node being created. NULL in case of creating a top level element. + * @param[in] module Module of the node being created. If NULL, @p parent module will be used. + * @param[in] name Schema node name of the new data node. The node can be #LYS_LEAF or #LYS_LEAFLIST. + * @param[in] value Binary value of the node. To learn what exactly is expected see @ref howtoDataLYB. + * @param[in] value_len Length of @p value. + * @param[in] output Flag in case the @p parent is RPC/Action. If value is 0, the input's data nodes of the RPC/Action are + * taken into consideration. Otherwise, the output's data node is going to be created. + * @param[out] node Optional created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_term_bin(struct lyd_node *parent, const struct lys_module *module, const char *name, + const void *value, size_t value_len, ly_bool output, struct lyd_node **node); + +/** + * @brief Create a new term node in the data tree. + * + * @param[in] parent Parent node for the node being created. NULL in case of creating a top level element. + * @param[in] module Module of the node being created. If NULL, @p parent module will be used. + * @param[in] name Schema node name of the new data node. The node can be #LYS_LEAF or #LYS_LEAFLIST. + * @param[in] val_str Canonical string value of the node. If it is not, it may lead to unexpected behavior. + * @param[in] output Flag in case the @p parent is RPC/Action. If value is 0, the input's data nodes of the RPC/Action are + * taken into consideration. Otherwise, the output's data node is going to be created. + * @param[out] node Optional created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_term_canon(struct lyd_node *parent, const struct lys_module *module, const char *name, + const char *val_str, ly_bool output, struct lyd_node **node); + +/** + * @brief Create a new top-level term node defined in the given extension instance. + * + * To create a term node with parent (no matter if defined inside extension instance or a standard tree) or a top-level + * node of a standard module's tree, use ::lyd_new_term(). + * + * @param[in] ext Extension instance where the term node being created is defined. + * @param[in] name Schema node name of the new data node. The node can be #LYS_LEAF or #LYS_LEAFLIST. + * @param[in] val_str String form of the value of the node being created. In case of an instance-identifier or identityref + * value, the JSON format is expected (module names instead of prefixes). + * @param[out] node The created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_ext_term(const struct lysc_ext_instance *ext, const char *name, const char *val_str, + struct lyd_node **node); + +/** + * @brief Create a new any node in the data tree. + * + * To create a top-level any node defined in an extension instance, use ::lyd_new_ext_any(). + * + * @param[in] parent Parent node for the node being created. NULL in case of creating a top level element. + * @param[in] module Module of the node being created. If NULL, @p parent module will be used. + * @param[in] name Schema node name of the new data node. The node can be #LYS_ANYDATA or #LYS_ANYXML. + * @param[in] value Value for the node. Expected type is determined by @p value_type. + * @param[in] use_value Whether to use dynamic @p value or make a copy. + * @param[in] value_type Type of the provided value in @p value. + * @param[in] output Flag in case the @p parent is RPC/Action. If value is 0, the input's data nodes of the RPC/Action are + * taken into consideration. Otherwise, the output's data node is going to be created. + * @param[out] node Optional created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_any(struct lyd_node *parent, const struct lys_module *module, const char *name, + const void *value, ly_bool use_value, LYD_ANYDATA_VALUETYPE value_type, ly_bool output, struct lyd_node **node); + +/** + * @brief Create a new top-level any node defined in the given extension instance. + * + * To create an any node with parent (no matter if defined inside extension instance or a standard tree) or a top-level + * any node of a standard module's tree, use ::lyd_new_any(). + * + * @param[in] ext Extension instance where the any node being created is defined. + * @param[in] name Schema node name of the new data node. The node can be #LYS_ANYDATA or #LYS_ANYXML. + * @param[in] value Value for the node. Expected type is determined by @p value_type. + * @param[in] use_value Whether to use dynamic @p value or make a copy. + * @param[in] value_type Type of the provided value in @p value. + * @param[out] node The created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_ext_any(const struct lysc_ext_instance *ext, const char *name, const void *value, + ly_bool use_value, LYD_ANYDATA_VALUETYPE value_type, struct lyd_node **node); + +/** + * @brief Create new metadata. + * + * @param[in] ctx libyang context, + * @param[in] parent Optional parent node for the metadata being created. Must be set if @p meta is NULL. + * @param[in] module Module of the metadata being created. If NULL, @p name must include module name as the prefix. + * @param[in] name Annotation name of the new metadata. It can include the annotation module as the prefix. + * If the prefix is specified it is always used but if not specified, @p module must be set. + * @param[in] val_str String form of the value of the metadata. In case of an instance-identifier or identityref + * value, the JSON format is expected (module names instead of prefixes). + * @param[in] clear_dflt Whether to clear the default flag starting from @p parent, recursively all NP containers. + * @param[out] meta Optional created metadata. Must be set if @p parent is NULL. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_meta(const struct ly_ctx *ctx, struct lyd_node *parent, const struct lys_module *module, + const char *name, const char *val_str, ly_bool clear_dflt, struct lyd_meta **meta); + +/** + * @brief Create new metadata from an opaque node attribute if possible. + * + * @param[in] ctx libyang context. + * @param[in] parent Optional parent node for the metadata being created. Must be set if @p meta is NULL. + * @param[in] clear_dflt Whether to clear the default flag starting from @p parent, recursively all NP containers. + * @param[in] attr Opaque node attribute to parse into metadata. + * @param[out] meta Optional created metadata. Must be set if @p parent is NULL. + * @return LY_SUCCESS on success. + * @return LY_ENOT if the attribute could not be parsed into any metadata. + * @return LY_ERR on error. + */ +LIBYANG_API_DECL LY_ERR lyd_new_meta2(const struct ly_ctx *ctx, struct lyd_node *parent, ly_bool clear_dflt, + const struct lyd_attr *attr, struct lyd_meta **meta); + +/** + * @brief Create a new JSON opaque node in the data tree. To create an XML opaque node, use ::lyd_new_opaq2(). + * + * @param[in] parent Parent node for the node being created. NULL in case of creating a top level element. + * @param[in] ctx libyang context. If NULL, @p parent context will be used. + * @param[in] name Node name. + * @param[in] value Optional node value. + * @param[in] prefix Optional node prefix, must be equal to @p module_name if set. + * @param[in] module_name Node module name. + * @param[out] node Optional created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_opaq(struct lyd_node *parent, const struct ly_ctx *ctx, const char *name, const char *value, + const char *prefix, const char *module_name, struct lyd_node **node); + +/** + * @brief Create a new XML opaque node in the data tree. To create a JSON opaque node, use ::lyd_new_opaq(). + * + * @param[in] parent Parent node for the node being created. NULL in case of creating a top level element. + * @param[in] ctx libyang context. If NULL, @p parent context will be used. + * @param[in] name Node name. + * @param[in] value Optional node value. + * @param[in] prefix Optional node prefix. + * @param[in] module_ns Node module namespace. + * @param[out] node Optional created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_opaq2(struct lyd_node *parent, const struct ly_ctx *ctx, const char *name, const char *value, + const char *prefix, const char *module_ns, struct lyd_node **node); + +/** + * @brief Create new JSON attribute for an opaque data node. To create an XML attribute, use ::lyd_new_attr2(). + * + * Note that for an attribute to be later resolved as YANG metadata, it needs @p module_nane and a prefix in @p name. + * + * @param[in] parent Parent opaque node for the attribute. + * @param[in] module_name Optional name of the module of the attribute. + * @param[in] name Attribute name with optional prefix, which is a module name. If the prefix is set, it is also stored + * as the explicit module name if @p module_name is not set. + * @param[in] value Optional attribute value. + * @param[out] attr Optional created attribute. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_attr(struct lyd_node *parent, const char *module_name, const char *name, const char *value, + struct lyd_attr **attr); + +/** + * @brief Create new XML attribute for an opaque data node. To create a JSON attribute, use ::lyd_new_attr(). + * + * Note that for an attribute to be later resolved as YANG metadata, it needs @p module_ns and a prefix in @p name. + * + * @param[in] parent Parent opaque node for the attribute being created. + * @param[in] module_ns Optional namespace of the module of the attribute. + * @param[in] name Attribute name with optional prefix, which is an XML prefix. + * @param[in] value Optional attribute value. + * @param[out] attr Optional created attribute. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_attr2(struct lyd_node *parent, const char *module_ns, const char *name, const char *value, + struct lyd_attr **attr); + +/** + * @ingroup datatree + * @defgroup pathoptions Data path creation options + * + * 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_NEW_PATH_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 parent tree, NULL is returned and + no error set. */ +#define LYD_NEW_PATH_OUTPUT 0x02 /**< Changes the behavior to ignoring RPC/action input schema nodes and using only + output ones. */ +#define LYD_NEW_PATH_OPAQ 0x04 /**< Enables the creation of opaque nodes with some specific rules. If the __last node__ + in the path is not uniquely defined ((leaf-)list without a predicate) or has an + invalid value (leaf/leaf-list), it is created as opaque. */ +#define LYD_NEW_PATH_BIN_VALUE 0x08 /**< Interpret the provided leaf/leaf-list @p value as being in the binary + ::LY_VALUE_LYB format, to learn what exactly is expected see @ref howtoDataLYB. */ +#define LYD_NEW_PATH_CANON_VALUE 0x10 /**< Interpret the provided leaf/leaf-list @p value as being in the canonical + (or JSON if no defined) ::LY_VALUE_CANON format. If it is not, it may lead + to unexpected behavior. */ + +/** @} pathoptions */ + +/** + * @brief Create a new node in the data tree based on a path. If creating anyxml/anydata nodes, ::lyd_new_path2 + * should be used instead, this function expects the value as string. + * + * If creating data nodes defined inside an extension instance, use ::lyd_new_ext_path(). + * + * If @p path points to a list key, the key value from the predicate is used and @p value is ignored. + * Also, if a leaf-list is being created and both a predicate is defined in @p path + * and @p value is set, the predicate is preferred. + * + * For key-less lists and non-configuration leaf-lists, positional predicates should be used (indices starting from 1). + * If no predicate is used for these nodes, they are always created. + * + * @param[in] parent Data parent to add to/modify, can be NULL. Note that in case a first top-level sibling is used, + * it may no longer be first if @p path is absolute and starts with a non-existing top-level node inserted + * before @p parent. Use ::lyd_first_sibling() to adjust @p parent in these cases. + * @param[in] ctx libyang context, must be set if @p parent is NULL. + * @param[in] path [Path](@ref howtoXPath) to create. + * @param[in] value String value of the new leaf/leaf-list. If it varies based on the format, ::LY_VALUE_JSON is expected. + * For other node types, it should be NULL. + * @param[in] options Bitmask of options, see @ref pathoptions. + * @param[out] node Optional first created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_path(struct lyd_node *parent, const struct ly_ctx *ctx, const char *path, const char *value, + uint32_t options, struct lyd_node **node); + +/** + * @brief Create a new node in the data tree based on a path. All node types can be created. + * + * Details are mentioned in ::lyd_new_path(). + * + * @param[in] parent Data parent to add to/modify, can be NULL. Note that in case a first top-level sibling is used, + * it may no longer be first if @p path is absolute and starts with a non-existing top-level node inserted + * before @p parent. Use ::lyd_first_sibling() to adjust @p parent in these cases. + * @param[in] ctx libyang context, must be set if @p parent is NULL. + * @param[in] path [Path](@ref howtoXPath) to create. + * @param[in] value Value of the new leaf/leaf-list (const char *) in ::LY_VALUE_JSON format. If creating an + * anyxml/anydata node, the expected type depends on @p value_type. For other node types, it should be NULL. + * @param[in] value_len Length of @p value in bytes. May be 0 if @p value is a zero-terminated string. Ignored when + * creating anyxml/anydata nodes. + * @param[in] value_type Anyxml/anydata node @p value type. + * @param[in] options Bitmask of options, see @ref pathoptions. + * @param[out] new_parent Optional first parent node created. If only one node was created, equals to @p new_node. + * @param[out] new_node Optional last node created. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_path2(struct lyd_node *parent, const struct ly_ctx *ctx, const char *path, const void *value, + size_t value_len, LYD_ANYDATA_VALUETYPE value_type, uint32_t options, struct lyd_node **new_parent, + struct lyd_node **new_node); + +/** + * @brief Create a new node defined in the given extension instance. In case of anyxml/anydata nodes, this function expects + * the @p value as string. + * + * If creating data nodes defined in a module's standard tree, use ::lyd_new_path() or ::lyd_new_path2(). + * + * Details are mentioned in ::lyd_new_path(). + * + * @param[in] parent Data parent to add to/modify, can be NULL. Note that in case a first top-level sibling is used, + * it may no longer be first if @p path is absolute and starts with a non-existing top-level node inserted + * before @p parent. Use ::lyd_first_sibling() to adjust @p parent in these cases. + * @param[in] ext Extension instance where the node being created is defined. + * @param[in] path [Path](@ref howtoXPath) to create. + * @param[in] value Value of the new leaf/leaf-list. For other node types, it should be NULL. + * @param[in] options Bitmask of options, see @ref pathoptions. + * @param[out] node Optional first created node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_ext_path(struct lyd_node *parent, const struct lysc_ext_instance *ext, const char *path, + const void *value, uint32_t options, struct lyd_node **node); + +/** + * @ingroup datatree + * @defgroup implicitoptions Implicit node creation options + * + * Various options to change lyd_new_implicit*() behavior. + * + * Default behavior: + * - both configuration and state missing implicit nodes are added. + * - for existing RPC/action nodes, input implicit nodes are added. + * - all implicit node types are added (non-presence containers, default leaves, and default leaf-lists). + * @{ + */ + +#define LYD_IMPLICIT_NO_STATE 0x01 /**< Do not add any implicit state nodes. */ +#define LYD_IMPLICIT_NO_CONFIG 0x02 /**< Do not add any implicit config nodes. */ +#define LYD_IMPLICIT_OUTPUT 0x04 /**< For RPC/action nodes, add output implicit nodes instead of input. */ +#define LYD_IMPLICIT_NO_DEFAULTS 0x08 /**< Do not add any default nodes (leaves/leaf-lists), only non-presence + containers. */ + +/** @} implicitoptions */ + +/** + * @brief Add any missing implicit nodes into a data subtree. Default nodes with a false "when" are not added. + * + * @param[in] tree Tree to add implicit nodes into. + * @param[in] implicit_options Options for implicit node creation, see @ref implicitoptions. + * @param[out] diff Optional diff with any created nodes. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_implicit_tree(struct lyd_node *tree, uint32_t implicit_options, struct lyd_node **diff); + +/** + * @brief Add any missing implicit nodes. Default nodes with a false "when" are not added. + * + * @param[in,out] tree Tree to add implicit nodes into. Note that in case a first top-level sibling is used, + * it may no longer be first if an implicit node was inserted before @p tree. Use ::lyd_first_sibling() to + * adjust @p tree in these cases. + * @param[in] ctx libyang context, must be set only if @p tree is an empty tree. + * @param[in] implicit_options Options for implicit node creation, see @ref implicitoptions. + * @param[out] diff Optional diff with any created nodes. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_implicit_all(struct lyd_node **tree, const struct ly_ctx *ctx, uint32_t implicit_options, + struct lyd_node **diff); + +/** + * @brief Add any missing implicit nodes of one module. Default nodes with a false "when" are not added. + * + * @param[in,out] tree Tree to add implicit nodes into. Note that in case a first top-level sibling is used, + * it may no longer be first if an implicit node was inserted before @p tree. Use ::lyd_first_sibling() to + * adjust @p tree in these cases. + * @param[in] module Module whose implicit nodes to create. + * @param[in] implicit_options Options for implicit node creation, see @ref implicitoptions. + * @param[out] diff Optional diff with any created nodes. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_new_implicit_module(struct lyd_node **tree, const struct lys_module *module, + uint32_t implicit_options, struct lyd_node **diff); + +/** + * @brief Change the value of a term (leaf or leaf-list) node to a string value. + * + * Node changed this way is always considered explicitly set, meaning its default flag + * is always cleared. + * + * @param[in] term Term node to change. + * @param[in] val_str New value to set, any prefixes are expected in JSON format. + * @return LY_SUCCESS if value was changed, + * @return LY_EEXIST if value was the same and only the default flag was cleared, + * @return LY_ENOT if the values were equal and no change occurred, + * @return LY_ERR value on other errors. + */ +LIBYANG_API_DECL LY_ERR lyd_change_term(struct lyd_node *term, const char *val_str); + +/** + * @brief Change the value of a term (leaf or leaf-list) node to a binary value. + * + * Node changed this way is always considered explicitly set, meaning its default flag + * is always cleared. + * + * @param[in] term Term node to change. + * @param[in] value New value to set in binary format, see @ref howtoDataLYB. + * @param[in] value_len Length of @p value. + * @return LY_SUCCESS if value was changed, + * @return LY_EEXIST if value was the same and only the default flag was cleared, + * @return LY_ENOT if the values were equal and no change occurred, + * @return LY_ERR value on other errors. + */ +LIBYANG_API_DECL LY_ERR lyd_change_term_bin(struct lyd_node *term, const void *value, size_t value_len); + +/** + * @brief Change the value of a term (leaf or leaf-list) node to a canonical string value. + * + * Node changed this way is always considered explicitly set, meaning its default flag + * is always cleared. + * + * @param[in] term Term node to change. + * @param[in] val_str New value to set in canonical (or JSON if no defined) format. If the value is not + * canonical, it may lead to unexpected behavior. + * @return LY_SUCCESS if value was changed, + * @return LY_EEXIST if value was the same and only the default flag was cleared, + * @return LY_ENOT if the values were equal and no change occurred, + * @return LY_ERR value on other errors. + */ +LIBYANG_API_DECL LY_ERR lyd_change_term_canon(struct lyd_node *term, const char *val_str); + +/** + * @brief Change the value of a metadata instance. + * + * @param[in] meta Metadata to change. + * @param[in] val_str New value to set, any prefixes are expected in JSON format. + * @return LY_SUCCESS if value was changed, + * @return LY_ENOT if the values were equal and no change occurred, + * @return LY_ERR value on other errors. + */ +LIBYANG_API_DECL LY_ERR lyd_change_meta(struct lyd_meta *meta, const char *val_str); + +/** + * @brief Insert a child into a 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 to insert into. + * @param[in] node Node to insert. + * @return LY_SUCCESS on success. + * @return LY_ERR error on error. + */ +LIBYANG_API_DECL LY_ERR lyd_insert_child(struct lyd_node *parent, struct lyd_node *node); + +/** + * @brief Insert a node into siblings. + * + * - 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] sibling Siblings to insert into, can even be NULL. + * @param[in] node Node to insert. + * @param[out] first Optionally return the first sibling after insertion. Can be the address of @p sibling. + * @return LY_SUCCESS on success. + * @return LY_ERR error on error. + */ +LIBYANG_API_DECL LY_ERR lyd_insert_sibling(struct lyd_node *sibling, struct lyd_node *node, struct lyd_node **first); + +/** + * @brief Insert a node before another node, can be used only for user-ordered nodes. + * If inserting several siblings, each of them must be inserted individually. + * + * - if the node is part of some other tree, it is automatically unlinked. + * + * @param[in] sibling Sibling node to insert before. + * @param[in] node Node to insert. + * @return LY_SUCCESS on success. + * @return LY_ERR error on error. + */ +LIBYANG_API_DECL LY_ERR lyd_insert_before(struct lyd_node *sibling, struct lyd_node *node); + +/** + * @brief Insert a node after another node, can be used only for user-ordered nodes. + * If inserting several siblings, each of them must be inserted individually. + * + * - if the node is part of some other tree, it is automatically unlinked. + * + * @param[in] sibling Sibling node to insert after. + * @param[in] node Node to insert. + * @return LY_SUCCESS on success. + * @return LY_ERR error on error. + */ +LIBYANG_API_DECL LY_ERR lyd_insert_after(struct lyd_node *sibling, struct lyd_node *node); + +/** + * @brief Unlink the specified node with all the following siblings. + * + * @param[in] node Data tree node to be unlinked (together with all the children and following siblings). + */ +LIBYANG_API_DECL void lyd_unlink_siblings(struct lyd_node *node); + +/** + * @brief Unlink the specified data subtree. + * + * @param[in] node Data tree node to be unlinked (together with all the children). + */ +LIBYANG_API_DECL void lyd_unlink_tree(struct lyd_node *node); + +/** + * @brief Free all the nodes (even parents of the node) in the data tree. + * + * @param[in] node Any of the nodes inside the tree. + */ +LIBYANG_API_DECL void lyd_free_all(struct lyd_node *node); + +/** + * @brief Free all the sibling nodes (preceding as well as succeeding). + * + * @param[in] node Any of the sibling nodes to free. + */ +LIBYANG_API_DECL void lyd_free_siblings(struct lyd_node *node); + +/** + * @brief Free (and unlink) the specified data (sub)tree. + * + * @param[in] node Root of the (sub)tree to be freed. + */ +LIBYANG_API_DECL void lyd_free_tree(struct lyd_node *node); + +/** + * @brief Free a single metadata instance. + * + * @param[in] meta Metadata to free. + */ +LIBYANG_API_DECL void lyd_free_meta_single(struct lyd_meta *meta); + +/** + * @brief Free the metadata instance with any following instances. + * + * @param[in] meta Metadata to free. + */ +LIBYANG_API_DECL void lyd_free_meta_siblings(struct lyd_meta *meta); + +/** + * @brief Free a single attribute. + * + * @param[in] ctx Context where the attributes were created. + * @param[in] attr Attribute to free. + */ +LIBYANG_API_DECL void lyd_free_attr_single(const struct ly_ctx *ctx, struct lyd_attr *attr); + +/** + * @brief Free the attribute with any following attributes. + * + * @param[in] ctx Context where the attributes were created. + * @param[in] attr First attribute to free. + */ +LIBYANG_API_DECL void lyd_free_attr_siblings(const struct ly_ctx *ctx, struct lyd_attr *attr); + +/** + * @brief Check type restrictions applicable to the particular leaf/leaf-list with the given string @p value. + * + * The given node is not modified in any way - it is just checked if the @p value can be set to the node. + * + * @param[in] ctx libyang context for logging (function does not log errors when @p ctx is NULL) + * @param[in] schema Schema node of the @p value. + * @param[in] value String value to be checked, it is expected to be in JSON format. + * @param[in] value_len Length of the given @p value (mandatory). + * @param[in] ctx_node Optional data tree context node for the value (leafref target, instance-identifier). + * If not set and is required for the validation to complete, ::LY_EINCOMPLETE is be returned. + * @param[out] realtype Optional real type of @p value. + * @param[out] canonical Optional canonical value of @p value (in the dictionary). + * @return LY_SUCCESS on success + * @return LY_EINCOMPLETE in case the @p ctx_node is not provided and it was needed to finish the validation + * (e.g. due to require-instance). + * @return LY_ERR value if an error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_value_validate(const struct ly_ctx *ctx, const struct lysc_node *schema, const char *value, + size_t value_len, const struct lyd_node *ctx_node, const struct lysc_type **realtype, const char **canonical); + +/** + * @brief Compare the node's value with the given string value. The string value is first validated according to + * the (current) node's type. + * + * @param[in] node Data node to compare. + * @param[in] value String value to be compared. It does not need to be in a canonical form - as part of the process, + * it is validated and canonized if possible. But it is expected to be in JSON format. + * @param[in] value_len Length of the given @p value (mandatory). + * @return LY_SUCCESS on success, + * @return LY_ENOT if the values do not match, + * @return LY_ERR value if an error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_value_compare(const struct lyd_node_term *node, const char *value, size_t value_len); + +/** + * @ingroup datatree + * @defgroup datacompareoptions Data compare options + * @{ + * Various options to change the ::lyd_compare_single() and ::lyd_compare_siblings() behavior. + */ +#define LYD_COMPARE_FULL_RECURSION 0x01 /* Lists and containers are the same only in case all they children + (subtree, so direct as well as indirect children) are the same. By default, + containers are the same in case of the same schema node and lists are the same + in case of equal keys (keyless lists do the full recursion comparison all the time). */ +#define LYD_COMPARE_DEFAULTS 0x02 /* By default, implicit and explicit default nodes are considered to be equal. This flag + changes this behavior and implicit (automatically created default node) and explicit + (explicitly created node with the default value) default nodes are considered different. */ +#define LYD_COMPARE_OPAQ 0x04 /* Opaque nodes can normally be never equal to data nodes. Using this flag even + opaque nodes members are compared to data node schema and value and can result + in a match. */ +/** @} datacompareoptions */ + +/** + * @brief Compare 2 data nodes if they are equivalent. + * + * Works correctly even if @p node1 and @p node2 have different contexts. + * + * @param[in] node1 The first node to compare. + * @param[in] node2 The second node to compare. + * @param[in] options Various @ref datacompareoptions. + * @return LY_SUCCESS if the nodes are equivalent. + * @return LY_ENOT if the nodes are not equivalent. + */ +LIBYANG_API_DECL LY_ERR lyd_compare_single(const struct lyd_node *node1, const struct lyd_node *node2, uint32_t options); + +/** + * @brief Compare 2 lists of siblings if they are equivalent. + * + * Works correctly even if @p node1 and @p node2 have different contexts. + * + * @param[in] node1 The first sibling list to compare. + * @param[in] node2 The second sibling list to compare. + * @param[in] options Various @ref datacompareoptions. + * @return LY_SUCCESS if all the siblings are equivalent. + * @return LY_ENOT if the siblings are not equivalent. + */ +LIBYANG_API_DECL LY_ERR lyd_compare_siblings(const struct lyd_node *node1, const struct lyd_node *node2, uint32_t options); + +/** + * @brief Compare 2 metadata. + * + * If @p meta1 and @p meta2 have different contexts, they are never equivalent. + * + * @param[in] meta1 First metadata. + * @param[in] meta2 Second metadata. + * @return LY_SUCCESS if the metadata are equivalent. + * @return LY_ENOT if not. + */ +LIBYANG_API_DECL LY_ERR lyd_compare_meta(const struct lyd_meta *meta1, const struct lyd_meta *meta2); + +/** + * @ingroup datatree + * @defgroup dupoptions Data duplication options + * + * Various options to change ::lyd_dup_single() and ::lyd_dup_siblings() behavior. + * + * Default behavior: + * - only the specified node is duplicated without siblings, parents, or children. + * - all the metadata of the duplicated nodes are also duplicated. + * @{ + */ + +#define LYD_DUP_RECURSIVE 0x01 /**< Duplicate not just the node but also all the children. Note that + list's keys are always duplicated. */ +#define LYD_DUP_NO_META 0x02 /**< Do not duplicate metadata (or attributes) of any node. */ +#define LYD_DUP_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! */ +#define LYD_DUP_WITH_FLAGS 0x08 /**< Also copy any data node flags. That will cause the duplicated data to preserve + its validation/default node state. */ +#define LYD_DUP_NO_EXT 0x10 /**< Do not duplicate nodes with the ::LYD_EXT flag (nested extension instance data). */ + +/** @} dupoptions */ + +/** + * @brief Create a copy of the specified data tree @p node. Schema references are kept the same. + * + * @param[in] node Data tree node to be duplicated. + * @param[in] parent Optional parent node where to connect the duplicated node(s). If set in combination with + * ::LYD_DUP_WITH_PARENTS, the missing parents' chain is duplicated and connected with @p parent. + * @param[in] options Bitmask of options flags, see @ref dupoptions. + * @param[out] dup Optional created copy of the node. Note that in case the parents chain is duplicated for the duplicated + * node(s) (when ::LYD_DUP_WITH_PARENTS used), the first duplicated node is still returned. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_dup_single(const struct lyd_node *node, struct lyd_node_inner *parent, uint32_t options, + struct lyd_node **dup); + +/** + * @brief Create a copy of the specified data tree @p node. Schema references are assigned from @p trg_ctx. + * + * @param[in] node Data tree node to be duplicated. + * @param[in] trg_ctx Target context for duplicated nodes. + * @param[in] parent Optional parent node where to connect the duplicated node(s). If set in combination with + * ::LYD_DUP_WITH_PARENTS, the missing parents' chain is duplicated and connected with @p parent. + * @param[in] options Bitmask of options flags, see @ref dupoptions. + * @param[out] dup Optional created copy of the node. Note that in case the parents chain is duplicated for the duplicated + * node(s) (when ::LYD_DUP_WITH_PARENTS used), the first duplicated node is still returned. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_dup_single_to_ctx(const struct lyd_node *node, const struct ly_ctx *trg_ctx, + struct lyd_node_inner *parent, uint32_t options, struct lyd_node **dup); + +/** + * @brief Create a copy of the specified data tree @p node with any following siblings. Schema references are kept the same. + * + * @param[in] node Data tree node to be duplicated. + * @param[in] parent Optional parent node where to connect the duplicated node(s). If set in combination with + * ::LYD_DUP_WITH_PARENTS, the missing parents' chain is duplicated and connected with @p parent. + * @param[in] options Bitmask of options flags, see @ref dupoptions. + * @param[out] dup Optional created copy of the node. Note that in case the parents chain is duplicated for the duplicated + * node(s) (when ::LYD_DUP_WITH_PARENTS used), the first duplicated node is still returned. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_dup_siblings(const struct lyd_node *node, struct lyd_node_inner *parent, uint32_t options, + struct lyd_node **dup); + +/** + * @brief Create a copy of the specified data tree @p node with any following siblings. Schema references are assigned + * from @p trg_ctx. + * + * @param[in] node Data tree node to be duplicated. + * @param[in] trg_ctx Target context for duplicated nodes. + * @param[in] parent Optional parent node where to connect the duplicated node(s). If set in combination with + * ::LYD_DUP_WITH_PARENTS, the missing parents' chain is duplicated and connected with @p parent. + * @param[in] options Bitmask of options flags, see @ref dupoptions. + * @param[out] dup Optional created copy of the node. Note that in case the parents chain is duplicated for the duplicated + * node(s) (when ::LYD_DUP_WITH_PARENTS used), the first duplicated node is still returned. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_dup_siblings_to_ctx(const struct lyd_node *node, const struct ly_ctx *trg_ctx, + struct lyd_node_inner *parent, uint32_t options, struct lyd_node **dup); + +/** + * @brief Create a copy of the metadata. + * + * @param[in] meta Metadata to copy. + * @param[in] parent Node where to append the new metadata. + * @param[out] dup Optional created metadata copy. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyd_dup_meta_single(const struct lyd_meta *meta, struct lyd_node *parent, struct lyd_meta **dup); + +/** + * @ingroup datatree + * @defgroup mergeoptions Data merge options. + * + * Various options to change ::lyd_merge_tree(), ::lyd_merge_siblings(), and ::lyd_merge_module() behavior. + * + * Default behavior: + * - source data tree is not modified in any way, + * - any default nodes in the source are ignored if there are explicit nodes in the target, + * - any metadata are ignored - those present in the target are kept, those in the source are not merged. + * - any merged nodes flags are set as non-validated. + * @{ + */ + +#define LYD_MERGE_DESTRUCT 0x01 /**< Spend source data tree in the function, it cannot be used afterwards! */ +#define LYD_MERGE_DEFAULTS 0x02 /**< Default nodes in the source tree replace even explicit nodes in the target. */ +#define LYD_MERGE_WITH_FLAGS 0x04 /**< Merged nodes (those missing in the source) keep their exact flags. */ + +/** @} mergeoptions */ + +/** + * @brief Merge the source data subtree into the target data tree. Merge may not be complete until validation + * is called on the resulting data tree (data from more cases may be present, default and non-default values). + * + * Example input: + * + * source (A1) - A2 - A3 target (B1) - B2 - B3 + * /\ /\ /\ /\ /\ /\ + * .... .... .... .... .... .... + * + * result target (A1) - B1 - B2 - B3 + * /\ /\ /\ /\ + * .... .... .... .... + * + * @param[in,out] target Target data tree to merge into, must be a top-level tree. Always points to the first sibling. + * @param[in] source Source data tree to merge, must be a top-level tree. + * @param[in] options Bitmask of option flags, see @ref mergeoptions. + * @return LY_SUCCESS on success, + * @return LY_ERR value on error. + */ +LIBYANG_API_DECL LY_ERR lyd_merge_tree(struct lyd_node **target, const struct lyd_node *source, uint16_t options); + +/** + * @brief Merge the source data tree with any following siblings into the target data tree. Merge may not be + * complete until validation called on the resulting data tree (data from more cases may be present, default + * and non-default values). + * + * Example input: + * + * source (A1) - A2 - A3 target (B1) - B2 - B3 + * /\ /\ /\ /\ /\ /\ + * .... .... .... .... .... .... + * + * result target (A1) - A2 - A3 - B1 - B2 - B3 + * /\ /\ /\ /\ /\ /\ + * .... .... .... .... .... .... + * + * @param[in,out] target Target data tree to merge into, must be a top-level tree. Always points to the first sibling. + * @param[in] source Source data tree to merge, must be a top-level tree. + * @param[in] options Bitmask of option flags, see @ref mergeoptions. + * @return LY_SUCCESS on success, + * @return LY_ERR value on error. + */ +LIBYANG_API_DECL LY_ERR lyd_merge_siblings(struct lyd_node **target, const struct lyd_node *source, uint16_t options); + +/** + * @brief Callback for matching merge nodes. + * + * @param[in] trg_node Target data node. + * @param[in] src_node Source data node, is NULL if it was actually duplicated (no target node found) and + * its copy is @p trg_node. + * @param[in] cb_data Arbitrary callback data. + * @return LY_ERR value. + */ +typedef LY_ERR (*lyd_merge_cb)(struct lyd_node *trg_node, const struct lyd_node *src_node, void *cb_data); + +/** + * @brief Merge all the nodes of a module from source data tree into the target data tree. Merge may not be + * complete until validation called on the resulting data tree (data from more cases may be present, default + * and non-default values). + * + * @param[in,out] target Target data tree to merge into, must be a top-level tree. Always points to the first sibling. + * @param[in] source Source data tree to merge, must be a top-level tree. + * @param[in] mod Module, whose source data only to consider, NULL for all modules. + * @param[in] merge_cb Optional merge callback that will be called for every merged node, before merging its descendants. + * If a subtree is being added into target (no matching node found), callback is called only once with the subtree root. + * @param[in] cb_data Arbitrary callback data. + * @param[in] options Bitmask of option flags, see @ref mergeoptions. + * @return LY_SUCCESS on success, + * @return LY_ERR value on error. + */ +LIBYANG_API_DECL LY_ERR lyd_merge_module(struct lyd_node **target, const struct lyd_node *source, const struct lys_module *mod, + lyd_merge_cb merge_cb, void *cb_data, uint16_t options); + +/** + * @ingroup datatree + * @defgroup diffoptions Data diff options. + * + * Various options to change ::lyd_diff_tree() and ::lyd_diff_siblings() behavior. + * + * Default behavior: + * - any default nodes are treated as non-existent and ignored. + * @{ + */ + +#define LYD_DIFF_DEFAULTS 0x01 /**< Default nodes in the trees are not ignored but treated similarly to explicit + nodes. Also, leaves and leaf-lists are added into diff even in case only their + default flag (state) was changed. */ + +/** @} diffoptions */ + +/** + * @brief Learn the differences between 2 data trees. + * + * The resulting diff is represented as a data tree with specific metadata from the internal 'yang' + * module. Most importantly, every node has an effective 'operation' metadata. If there is none + * defined on the node, it inherits the operation from the nearest parent. Top-level nodes must + * always have the 'operation' metadata defined. Additional metadata ('orig-default', 'value', + * 'orig-value', 'key', 'orig-key') are used for storing more information about the value in the first + * or the second tree. + * + * The diff tree is completely independent on the @p first and @p second trees, meaning all + * the information about the change is stored in the diff and the trees are not needed. + * + * __!! Caution !!__ + * The diff tree should never be validated because it may easily not be valid! For example, + * when data from one case branch are deleted and data from another branch created - data from both + * branches are then stored in the diff tree simultaneously. + * + * @param[in] first First data tree. + * @param[in] second Second data tree. + * @param[in] options Bitmask of options flags, see @ref diffoptions. + * @param[out] diff Generated diff. + * @return LY_SUCCESS on success, + * @return LY_ERR on error. + */ +LIBYANG_API_DECL LY_ERR lyd_diff_tree(const struct lyd_node *first, const struct lyd_node *second, uint16_t options, + struct lyd_node **diff); + +/** + * @brief Learn the differences between 2 data trees including all the following siblings. + * + * Details are mentioned in ::lyd_diff_tree(). + * + * @param[in] first First data tree. + * @param[in] second Second data tree. + * @param[in] options Bitmask of options flags, see @ref diffoptions. + * @param[out] diff Generated diff. + * @return LY_SUCCESS on success, + * @return LY_ERR on error. + */ +LIBYANG_API_DECL LY_ERR lyd_diff_siblings(const struct lyd_node *first, const struct lyd_node *second, uint16_t options, + struct lyd_node **diff); + +/** + * @brief Callback for diff nodes. + * + * @param[in] diff_node Diff node. + * @param[in] data_node Matching node in data. + * @param[in] cb_data Arbitrary callback data. + * @return LY_ERR value. + */ +typedef LY_ERR (*lyd_diff_cb)(const struct lyd_node *diff_node, struct lyd_node *data_node, void *cb_data); + +/** + * @brief Apply the whole diff on a data tree but restrict the operation to one module. + * + * __!! Caution !!__ + * If applying a diff that was created __without__ the ::LYD_DIFF_DEFAULTS flag, there may be some duplicate values + * created. Unless the resulting tree is validated (and default values thus consolidated), using it further + * (such as applying another diff) may cause unexpected results or errors. + * + * @param[in,out] data Data to apply the diff on. + * @param[in] diff Diff to apply. + * @param[in] mod Module, whose diff/data only to consider, NULL for all modules. + * @param[in] diff_cb Optional diff callback that will be called for every changed node. + * @param[in] cb_data Arbitrary callback data. + * @return LY_SUCCESS on success, + * @return LY_ERR on error. + */ +LIBYANG_API_DECL LY_ERR lyd_diff_apply_module(struct lyd_node **data, const struct lyd_node *diff, + const struct lys_module *mod, lyd_diff_cb diff_cb, void *cb_data); + +/** + * @brief Apply the whole diff tree on a data tree. + * + * Details are mentioned in ::lyd_diff_apply_module(). + * + * @param[in,out] data Data to apply the diff on. + * @param[in] diff Diff to apply. + * @return LY_SUCCESS on success, + * @return LY_ERR on error. + */ +LIBYANG_API_DECL LY_ERR lyd_diff_apply_all(struct lyd_node **data, const struct lyd_node *diff); + +/** + * @ingroup datatree + * @defgroup diffmergeoptions Data diff merge options. + * + * Various options to change ::lyd_diff_merge_module(), ::lyd_diff_merge_tree(), and ::lyd_diff_merge_all() behavior. + * + * Default behavior: + * - any default nodes are expected to be a result of validation corrections and not explicitly modified. + * @{ + */ + +#define LYD_DIFF_MERGE_DEFAULTS 0x01 /**< Default nodes in the diffs are treated as possibly explicitly modified. */ + +/** @} diffmergeoptions */ + +/** + * @brief Merge 2 diffs into each other but restrict the operation to one module. + * + * The diffs must be possible to be merged, which is guaranteed only if the source diff was + * created on data that had the target diff applied on them. In other words, this sequence is legal + * + * 1) get diff1 from data1 and data2 -> get data11 from apply diff1 on data1 -> get diff2 from data11 and data3 -> + * -> get data 33 from apply diff2 on data1 + * + * and reusing these diffs + * + * 2) get diff11 from merge diff1 and diff2 -> get data33 from apply diff11 on data1 + * + * @param[in,out] diff Target diff to merge into. + * @param[in] src_diff Source diff. + * @param[in] mod Module, whose diff only to consider, NULL for all modules. + * @param[in] diff_cb Optional diff callback that will be called for every merged node. Param @p diff_node is the source + * diff node while @p data_node is the updated target diff node. In case a whole subtree is added, the callback is + * called on the root with @p diff_node being NULL. + * @param[in] cb_data Arbitrary callback data. + * @param[in] options Bitmask of options flags, see @ref diffmergeoptions. + * @return LY_SUCCESS on success, + * @return LY_ERR on error. + */ +LIBYANG_API_DECL LY_ERR lyd_diff_merge_module(struct lyd_node **diff, const struct lyd_node *src_diff, + const struct lys_module *mod, lyd_diff_cb diff_cb, void *cb_data, uint16_t options); + +/** + * @brief Merge 2 diff trees into each other. + * + * Details are mentioned in ::lyd_diff_merge_module(). + * + * @param[in,out] diff_first Target diff first sibling to merge into. + * @param[in] diff_parent Target diff parent to merge into. + * @param[in] src_sibling Source diff sibling to merge. + * @param[in] diff_cb Optional diff callback that will be called for every merged node. Param @p diff_node is the source + * diff node while @p data_node is the updated target diff node. In case a whole subtree is added, the callback is + * called on the root with @p diff_node being NULL. + * @param[in] cb_data Arbitrary callback data. + * @param[in] options Bitmask of options flags, see @ref diffmergeoptions. + * @return LY_SUCCESS on success, + * @return LY_ERR on error. + */ +LIBYANG_API_DECL LY_ERR lyd_diff_merge_tree(struct lyd_node **diff_first, struct lyd_node *diff_parent, + const struct lyd_node *src_sibling, lyd_diff_cb diff_cb, void *cb_data, uint16_t options); + +/** + * @brief Merge 2 diffs into each other. + * + * Details are mentioned in ::lyd_diff_merge_module(). + * + * @param[in,out] diff Target diff to merge into. + * @param[in] src_diff Source diff. + * @param[in] options Bitmask of options flags, see @ref diffmergeoptions. + * @return LY_SUCCESS on success, + * @return LY_ERR on error. + */ +LIBYANG_API_DECL LY_ERR lyd_diff_merge_all(struct lyd_node **diff, const struct lyd_node *src_diff, uint16_t options); + +/** + * @brief Reverse a diff and make the opposite changes. Meaning change create to delete, delete to create, + * or move from place A to B to move from B to A and so on. + * + * @param[in] src_diff Diff to reverse. + * @param[out] diff Reversed diff. + * @return LY_SUCCESS on success. + * @return LY_ERR on error. + */ +LIBYANG_API_DECL LY_ERR lyd_diff_reverse_all(const struct lyd_node *src_diff, struct lyd_node **diff); + +/** + * @brief Deprecated, use ::lyd_find_target() instead. + * + * @param[in] path Compiled path structure. + * @param[in] tree Data tree to be searched. + * @return Found target node, + * @return NULL if not found. + */ +LIBYANG_API_DECL const struct lyd_node_term *lyd_target(const struct ly_path *path, const struct lyd_node *tree); + +/** + * @brief Types of the different data paths. + */ +typedef enum { + LYD_PATH_STD, /**< Generic data path used for logging, node searching (::lyd_find_xpath(), ::lys_find_path()) as well as + creating new nodes (::lyd_new_path(), ::lyd_new_path2(), ::lyd_new_ext_path()). */ + LYD_PATH_STD_NO_LAST_PRED /**< Similar to ::LYD_PATH_STD except there is never a predicate on the last node. While it + can be used to search for nodes, do not use it to create new data nodes (lists). */ +} LYD_PATH_TYPE; + +/** + * @brief Generate path of the given node in the requested format. + * + * @param[in] node Data path of this node will be generated. + * @param[in] pathtype Format of the path to generate. + * @param[in,out] buffer Prepared buffer of the @p buflen length to store the generated path. + * If NULL, memory for the complete path is allocated. + * @param[in] buflen Size of the provided @p buffer. + * @return NULL in case of memory allocation error, path of the node otherwise. + * In case the @p buffer is NULL, the returned string is dynamically allocated and caller is responsible to free it. + */ +LIBYANG_API_DECL char *lyd_path(const struct lyd_node *node, LYD_PATH_TYPE pathtype, char *buffer, size_t buflen); + +/** + * @brief Find a specific metadata. + * + * @param[in] first First metadata to consider. + * @param[in] module Module of the metadata definition, may be NULL if @p name includes a prefix. + * @param[in] name Name of the metadata to find, may not include a prefix (module name) if @p module is set. + * @return Found metadata, + * @return NULL if not found. + */ +LIBYANG_API_DECL struct lyd_meta *lyd_find_meta(const struct lyd_meta *first, const struct lys_module *module, + const char *name); + +/** + * @brief Search in the given siblings (NOT recursively) for the first target instance with the same value. + * Uses hashes - should be used whenever possible for best performance. + * + * @param[in] siblings Siblings to search in including preceding and succeeding nodes. + * @param[in] target Target node to find. + * @param[out] match Can be NULL, otherwise the found data node. + * @return LY_SUCCESS on success, @p match set. + * @return LY_ENOTFOUND if not found, @p match set to NULL. + * @return LY_ERR value if another error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_find_sibling_first(const struct lyd_node *siblings, const struct lyd_node *target, + struct lyd_node **match); + +/** + * @brief Search in the given siblings for the first schema instance. + * Uses hashes - should be used whenever possible for best performance. + * + * @param[in] siblings Siblings to search in including preceding and succeeding nodes. + * @param[in] schema Schema node of the data node to find. + * @param[in] key_or_value If it is NULL, the first schema node data instance is found. For nodes with many + * instances, it can be set based on the type of @p schema: + * LYS_LEAFLIST: + * Searched instance value. + * LYS_LIST: + * Searched instance key values in the form of "[key1='val1'][key2='val2']...". + * The keys do not have to be ordered but all of them must be set. + * + * Note that any explicit values (leaf-list or list key values) will be canonized first + * before comparison. But values that do not have a canonical value are expected to be in the + * JSON format! + * @param[in] val_len Optional length of @p key_or_value in case it is not 0-terminated. + * @param[out] match Can be NULL, otherwise the found data node. + * @return LY_SUCCESS on success, @p match set. + * @return LY_ENOTFOUND if not found, @p match set to NULL. + * @return LY_EINVAL if @p schema is a key-less list. + * @return LY_ERR value if another error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_find_sibling_val(const struct lyd_node *siblings, const struct lysc_node *schema, + const char *key_or_value, size_t val_len, struct lyd_node **match); + +/** + * @brief Search the given siblings for all the exact same instances of a specific node instance. + * Uses hashes to whatever extent possible. + * + * @param[in] siblings Siblings to search in including preceding and succeeding nodes. + * @param[in] target Target node instance to find. + * @param[out] set Set with all the found instances. The first item is always the first instance. + * @return LY_SUCCESS on success, @p set returned. + * @return LY_ENOTFOUND if not found, empty @p set returned. + * @return LY_ERR value if another error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_find_sibling_dup_inst_set(const struct lyd_node *siblings, const struct lyd_node *target, + struct ly_set **set); + +/** + * @brief Search the given siblings for an opaque node with a specific name. + * + * @param[in] first First sibling to consider. + * @param[in] name Opaque node name to find. + * @param[out] match Can be NULL, otherwise the found data node. + * @return LY_SUCCESS on success, @p match set. + * @return LY_ENOTFOUND if not found, @p match set to NULL. + * @return LY_ERR value is an error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_find_sibling_opaq_next(const struct lyd_node *first, const char *name, struct lyd_node **match); + +/** + * @brief Set a new XPath variable to @p vars. + * + * @param[in,out] vars Pointer to [sized array](@ref sizedarrays) of XPath variables. + * To create a new array, set the @p vars target pointer to NULL. + * Otherwise variable named @p name with a value @p value will be added to the @p vars + * or its value will be changed if the variable is already defined. + * @param[in] name Name of the added/edited variable. + * @param[in] value Value of the variable. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyxp_vars_set(struct lyxp_var **vars, const char *name, const char *value); + +/** + * @brief Free the XPath variables. + * + * @param[in] vars [Sized array](@ref sizedarrays) of XPath variables. + */ +LIBYANG_API_DECL void lyxp_vars_free(struct lyxp_var *vars); + +/** + * @brief Search in the given data for instances of nodes matching the provided XPath. + * + * If a list instance is being selected with all its key values specified and ordered + * in the form `list[key1=...][key2=...][key3=...]` or a leaf-list instance in the form + * `leaf-list[.=...]`, these instances are found using hashes with constant (*O(1)*) complexity + * (unless they are defined in top-level). Other predicates can still follow the aforementioned ones. + * + * @param[in] ctx_node XPath context node. + * @param[in] xpath [XPath](@ref howtoXPath) to select in JSON format. It must evaluate into a node set. + * @param[out] set Set of found data nodes. In case the result is a number, a string, or a boolean, + * the returned set is empty. + * @return LY_SUCCESS on success, @p set is returned. + * @return LY_ERR value if an error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_find_xpath(const struct lyd_node *ctx_node, const char *xpath, struct ly_set **set); + +/** + * @brief Search in the given data for instances of nodes matching the provided XPath. + * + * It is ::lyd_find_xpath() with @p vars added. + * + * @param[in] ctx_node XPath context node. + * @param[in] xpath [XPath](@ref howtoXPath) to select in JSON format. + * @param[in] vars [Sized array](@ref sizedarrays) of XPath variables. + * @param[out] set Set of found data nodes. In case the result is a number, a string, or a boolean, + * the returned set is empty. + * @return LY_SUCCESS on success, @p set is returned. + * @return LY_ERR value if an error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_find_xpath2(const struct lyd_node *ctx_node, const char *xpath, const struct lyxp_var *vars, + struct ly_set **set); + +/** + * @brief Search in the given data for instances of nodes matching the provided XPath. + * + * It is ::lyd_find_xpath2() with @p tree added so that @p ctx_node may be the root. + * + * @param[in] ctx_node XPath context node, NULL for the root node. + * @param[in] tree Data tree to evaluate on. + * @param[in] xpath [XPath](@ref howtoXPath) to select in JSON format. + * @param[in] vars [Sized array](@ref sizedarrays) of XPath variables. + * @param[out] set Set of found data nodes. In case the result is a number, a string, or a boolean, + * the returned set is empty. + * @return LY_SUCCESS on success, @p set is returned. + * @return LY_ERR value if an error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_find_xpath3(const struct lyd_node *ctx_node, const struct lyd_node *tree, const char *xpath, + const struct lyxp_var *vars, struct ly_set **set); + +/** + * @brief Search in the given data for instances of nodes matching the provided XPath. + * + * It is ::lyd_find_xpath3() with @p format and @p prefix_data added for special use-cases. + * + * @param[in] ctx_node XPath context node, NULL for the root node. + * @param[in] tree Data tree to evaluate on. + * @param[in] xpath [XPath](@ref howtoXPath) to select with prefix in @p format. + * @param[in] format Format of any prefixes in @p xpath. + * @param[in] prefix_data Format-specific prefix data. + * @param[in] vars [Sized array](@ref sizedarrays) of XPath variables. + * @param[out] set Set of found data nodes. In case the result is a number, a string, or a boolean, + * the returned set is empty. + * @return LY_SUCCESS on success, @p set is returned. + * @return LY_ERR value if an error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_find_xpath4(const struct lyd_node *ctx_node, const struct lyd_node *tree, const char *xpath, + LY_VALUE_FORMAT format, void *prefix_data, const struct lyxp_var *vars, struct ly_set **set); + +/** + * @brief Evaluate an XPath on data and return the result converted to boolean. + * + * Optimizations similar as in ::lyd_find_xpath(). + * + * @param[in] ctx_node XPath context node. + * @param[in] xpath [XPath](@ref howtoXPath) to select. + * @param[out] result Expression result converted to boolean. + * @return LY_SUCCESS on success, @p result is returned. + * @return LY_ERR value if an error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_eval_xpath(const struct lyd_node *ctx_node, const char *xpath, ly_bool *result); + +/** + * @brief Evaluate an XPath on data and return the result converted to boolean. + * + * It is ::lyd_eval_xpath() with @p vars added. + * + * @param[in] ctx_node XPath context node. + * @param[in] xpath [XPath](@ref howtoXPath) to select. + * @param[in] vars [Sized array](@ref sizedarrays) of XPath variables. + * @param[out] result Expression result converted to boolean. + * @return LY_SUCCESS on success, @p result is returned. + * @return LY_ERR value if an error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_eval_xpath2(const struct lyd_node *ctx_node, const char *xpath, + const struct lyxp_var *vars, ly_bool *result); + +/** + * @brief Evaluate an XPath on data and return the result converted to boolean. + * + * It is ::lyd_eval_xpath2() with @p format and @p prefix_data added for special use-cases. + * + * @param[in] ctx_node XPath context node. + * @param[in] cur_mod Current module of @p xpath, needed for some kinds of @p format. + * @param[in] xpath [XPath](@ref howtoXPath) to select. + * @param[in] format Format of any prefixes in @p xpath. + * @param[in] prefix_data Format-specific prefix data. + * @param[in] vars [Sized array](@ref sizedarrays) of XPath variables. + * @param[out] result Expression result converted to boolean. + * @return LY_SUCCESS on success, @p result is returned. + * @return LY_ERR value if an error occurred. + */ +LIBYANG_API_DECL LY_ERR lyd_eval_xpath3(const struct lyd_node *ctx_node, const struct lys_module *cur_mod, + const char *xpath, LY_VALUE_FORMAT format, void *prefix_data, const struct lyxp_var *vars, ly_bool *result); + +/** + * @brief Search in given data for a node uniquely identified by a path. + * + * Always works in constant (*O(1)*) complexity. To be exact, it is *O(n)* where *n* is the depth + * of the path used. + * + * @param[in] ctx_node Path context node. + * @param[in] path [Path](@ref howtoXPath) to find. + * @param[in] output Whether to search in RPC/action output nodes or in input nodes. + * @param[out] match Can be NULL, otherwise the found data node. + * @return LY_SUCCESS on success, @p match is set to the found node. + * @return LY_EINCOMPLETE if only a parent of the node was found, @p match is set to this parent node. + * @return LY_ENOTFOUND if no nodes in the path were found. + * @return LY_ERR on other errors. + */ +LIBYANG_API_DECL LY_ERR lyd_find_path(const struct lyd_node *ctx_node, const char *path, ly_bool output, + struct lyd_node **match); + +/** + * @brief Find the target node of a compiled path (::lyd_value instance-identifier). + * + * @param[in] path Compiled path structure. + * @param[in] tree Data tree to be searched. + * @param[out] match Can be NULL, otherwise the found data node. + * @return LY_SUCCESS on success, @p match is set to the found node. + * @return LY_ENOTFOUND if no match was found. + * @return LY_ERR on other errors. + */ +LIBYANG_API_DECL LY_ERR lyd_find_target(const struct ly_path *path, const struct lyd_node *tree, struct lyd_node **match); + +/** + * @brief Convert date-and-time from string to UNIX timestamp and fractions of a second. + * + * @param[in] value Valid string date-and-time value. + * @param[out] time UNIX timestamp. + * @param[out] fractions_s Optional fractions of a second, set to NULL if none. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR ly_time_str2time(const char *value, time_t *time, char **fractions_s); + +/** + * @brief Convert UNIX timestamp and fractions of a second into canonical date-and-time string value. + * + * @param[in] time UNIX timestamp. + * @param[in] fractions_s Fractions of a second, if any. + * @param[out] str String date-and-time value in the local timezone. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR ly_time_time2str(time_t time, const char *fractions_s, char **str); + +/** + * @brief Convert date-and-time from string to timespec. + * + * @param[in] value Valid string date-and-time value. + * @param[out] ts Timespec. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR ly_time_str2ts(const char *value, struct timespec *ts); + +/** + * @brief Convert timespec into date-and-time string value. + * + * @param[in] ts Timespec. + * @param[out] str String date-and-time value in the local timezone. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR ly_time_ts2str(const struct timespec *ts, char **str); + +#ifdef __cplusplus +} +#endif + +#endif /* LY_TREE_DATA_H_ */ |