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| -rw-r--r-- | src/plugins_exts.h | 1048 |
1 files changed, 1048 insertions, 0 deletions
diff --git a/src/plugins_exts.h b/src/plugins_exts.h new file mode 100644 index 0000000..f005391 --- /dev/null +++ b/src/plugins_exts.h @@ -0,0 +1,1048 @@ +/** + * @file plugins_exts.h + * @author Radek Krejci <rkrejci@cesnet.cz> + * @author Michal Vasko <mvasko@cesnet.cz> + * @brief libyang support for YANG extensions implementation. + * + * 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_PLUGINS_EXTS_H_ +#define LY_PLUGINS_EXTS_H_ + +#include "log.h" +#include "parser_data.h" +#include "plugins.h" +#include "tree_data.h" +#include "tree_edit.h" +#include "tree_schema.h" + +struct ly_ctx; +struct ly_in; +struct lyd_node; +struct lysc_ctx; +struct lysc_ext_substmt; +struct lysp_ctx; +struct lyspr_ctx; +struct lyspr_tree_ctx; + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * @page howtoPluginsExtensions Extension Plugins + * + * Note that the part of the libyang API here is available only by including a separated `<libyang/plugins_exts.h>` header + * file. Also note that the extension plugins API is versioned separately from libyang itself, so backward incompatible + * changes can come even without changing libyang major version. + * + * YANG extensions are very complex. Usually only its description specifies how it is supposed to behave, what are the + * allowed substatements, their cardinality or if the standard YANG statements placed inside the extension differs somehow + * in their meaning or behavior. libyang provides the Extension plugins API to implement such extensions and add its support + * into libyang itself. However we tried our best, the API is not (and it cannot be) so universal and complete to cover all + * possibilities. There are definitely use cases which cannot be simply implemented only with this API. + * + * libyang implements 3 important extensions: [NACM](https://tools.ietf.org/html/rfc8341), [Metadata](@ref howtoDataMetadata) + * and [yang-data](@ref howtoDataYangdata). Despite the core implementation in all three cases is done via extension plugin + * API, also other parts of the libyang code had to be extended to cover complete scope of the extensions. + * + * We believe, that the API is capable to allow implementation of very wide range of YANG extensions. However, if you see + * limitations for the particular YANG extension, don't hesitate to contact the project developers to discuss all the + * options, including updating the API. + * + * The plugin's functionality is provided to libyang via a set of callbacks specified as an array of ::lyplg_ext_record + * structures using the ::LYPLG_EXTENSIONS macro. + * + * The most important callbacks are ::lyplg_ext.parse and ::lyplg_ext.compile. They are responsible for parsing and + * compiling extension instance. This should include validating all the substatements, their values, or placement of + * the extension instance itself. If needed, the processed data can be stored in some form into the compiled schema + * representation of the extension instance. To make this task as easy as possible, libyang provides several + * [parsing](@ref pluginsExtensionsParse) and [compilation](@ref pluginsExtensionsCompile) helper functions to process + * known YANG statements exactly as if they were standard YANG statements. + * + * The data validation callback ::lyplg_ext.validate is used for additional validation of a data nodes that contains the + * connected extension instance directly (as a substatement) or indirectly in case of terminal nodes via their type (no + * matter if the extension instance is placed directly in the leaf's/leaf-list's type or in the type of the referenced + * typedef). + * + * The ::lyplg_ext.printer_info callback implement printing the compiled extension instance data when the schema (module) is + * being printed in the ::LYS_OUT_YANG_COMPILED (info) format. As for compile callback, there are also + * [helper functions](@ref pluginsExtensionsSprinterInfo) to access printer's context and to print standard YANG statements + * placed in the extension instance by libyang itself. + * + * The ::lyplg_ext.printer_ctree and ::lyplg_ext.printer_ptree callbacks implement printing of YANG tree diagrams + * (RFC 8340) for extension instance data. These callbacks are called for extension instances that have + * parents of type ::LY_STMT_MODULE, ::LY_STMT_SUBMODULE. Or these callbacks are called if the printer_tree finds + * a compiled/parsed data-node containing an extension instance. The callbacks should then decide which nodes + * should be printed within the extension instance. In addition, it is possible to register additional callbacks + * to the printer_tree context to override the form of the each node in the extension instance. + * + * The last callback, ::lyplg_ext.cfree, is supposed to free all the data allocated by the ::lyplg_ext.compile callback. + * To free the data created by helper function ::lyplg_ext_compile_extension_instance(), the plugin can used + * ::lyplg_ext_cfree_instance_substatements(). + * + * The plugin information contains also the plugin identifier (::lyplg_type.id). This string can serve to identify the + * specific plugin responsible to storing data value. In case the user can recognize the id string, it can access the + * plugin specific data with the appropriate knowledge of its structure. + * + * Logging information from an extension plugin is possible via ::lyplg_ext_parse_log() and ::lyplg_ext_compile_log() functions. + */ + +/** + * @defgroup pluginsExtensions Plugins: Extensions + * + * Structures and functions to for libyang plugins implementing specific YANG extensions defined in YANG modules. For more + * information, see @ref howtoPluginsTypes. + * + * This part of libyang API is available by including `<libyang/plugins_ext.h>` header file. + * + * @{ + */ + +/** + * @brief Extensions API version + */ +#define LYPLG_EXT_API_VERSION 6 + +/** + * @brief Mask for an operation statement. + * + * This mask matches action and RPC. + */ +#define LY_STMT_OP_MASK (LY_STMT_ACTION | LY_STMT_RPC) + +/** + * @brief Mask for a data node statement. + * + * This mask matches anydata, anyxml, case, choice, container, leaf, leaf-list, and list. + */ +#define LY_STMT_DATA_NODE_MASK (LY_STMT_ANYDATA | LY_STMT_ANYXML | LY_STMT_CASE | LY_STMT_CHOICE | LY_STMT_CONTAINER |\ + LY_STMT_LEAF | LY_STMT_LEAF_LIST | LY_STMT_LIST) + +/** + * @brief Mask for a node statement. + * + * This mask matches notification, input, output, action, RPC, anydata, anyxml, augment, case, choice, container, + * grouping, leaf, leaf-list, list, and uses. + */ +#define LY_STMT_NODE_MASK 0xFFFF + +/** + * @brief List of YANG statements + * + * Their description mentions what types are stored for each statement. Note that extension instance storage + * always stores a pointer to the type, not the type itself. + */ +enum ly_stmt { + LY_STMT_NONE = 0, + + LY_STMT_NOTIFICATION = 0x0001, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_notif *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_notif *` */ + LY_STMT_INPUT = 0x0002, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_action_inout *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_action_inout *` */ + LY_STMT_OUTPUT = 0x0004, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_action_inout *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_action_inout *` */ + LY_STMT_ACTION = 0x0008, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_action *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_action *` */ + LY_STMT_RPC = 0x0010, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_action *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_action *` */ + LY_STMT_ANYDATA = 0x0020, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_anydata *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_anydata *` */ + LY_STMT_ANYXML = 0x0040, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_anydata *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_anydata *` */ + LY_STMT_AUGMENT = 0x0080, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_augment *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_node *` */ + LY_STMT_CASE = 0x0100, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_case *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_case *` */ + LY_STMT_CHOICE = 0x0200, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_choice *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_choice *` */ + LY_STMT_CONTAINER = 0x0400, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_container *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_container *` */ + LY_STMT_GROUPING = 0x0800, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_grp *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_node *` */ + LY_STMT_LEAF = 0x1000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_leaf *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_leaf *` */ + LY_STMT_LEAF_LIST = 0x2000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_leaflist *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_leaflist *` */ + LY_STMT_LIST = 0x4000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_list *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node_list *` */ + LY_STMT_USES = 0x8000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_node_uses *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_node *` */ + + LY_STMT_ARGUMENT = 0x10000, /**< ::lysp_ext_substmt.storage - `const char *` + ::lysp_ext_instance.parent - `struct lysp_ext *` + ::lysc_ext_substmt.storage - `const char *` + ::lysc_ext_instance.parent - `struct lysc_ext *` */ + LY_STMT_BASE = 0x20000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `const char **`[] + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_ident *` */ + LY_STMT_BELONGS_TO = 0x30000, /**< ::lysp_ext_substmt.storage - `const char *` + ::lysp_ext_instance.parent - `struct lysp_submodule *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_module *` */ + LY_STMT_BIT = 0x40000, /**< ::lysp_ext_substmt.storage - `struct lysp_type_enum *`[] + ::lysp_ext_instance.parent - `struct lysp_type_enum *` + ::lysc_ext_substmt.storage - `struct lysc_type_bitenum_item *`[] + ::lysc_ext_instance.parent - `struct lysc_type_bitenum_item *` */ + LY_STMT_CONFIG = 0x50000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `uint16_t *` + ::lysc_ext_substmt.storage - `uint16_t *` + ::lysc_ext_instance.parent - `struct lysc_node *` */ + LY_STMT_CONTACT = 0x60000, /**< ::lysp_ext_substmt.storage - `const char *` + ::lysp_ext_instance.parent - `struct lysp_(sub)module *` + ::lysc_ext_substmt.storage - `const char *` + ::lysc_ext_instance.parent - `struct lysc_module *` */ + LY_STMT_DEFAULT = 0x70000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_qname *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_node *`, `struct lysc_type *` (typedef) */ + LY_STMT_DESCRIPTION = 0x80000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `const char *` + ::lysc_ext_substmt.storage - `const char *` + ::lysc_ext_instance.parent - compiled parent statement */ + LY_STMT_DEVIATE = 0x90000, /**< ::lysp_ext_substmt.storage - `struct lysp_deviate *`[] + ::lysp_ext_instance.parent - `struct lysp_deviate *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - not compiled */ + LY_STMT_DEVIATION = 0xA0000, /**< ::lysp_ext_substmt.storage - `struct lysp_deviation *`[] + ::lysp_ext_instance.parent - `struct lysp_deviation *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_node *` */ + LY_STMT_ENUM = 0xB0000, /**< ::lysp_ext_substmt.storage - `struct lysp_type_enum *`[] + ::lysp_ext_instance.parent - `struct lysp_type_enum *` + ::lysc_ext_substmt.storage - `struct lysc_type_bitenum_item *`[] + ::lysc_ext_instance.parent - `struct lysc_type_bitenum_item *` */ + LY_STMT_ERROR_APP_TAG = 0xC0000, /**< ::lysp_ext_substmt.storage - `const char *` + ::lysp_ext_instance.parent - `struct lysp_restr *` + ::lysc_ext_substmt.storage - `const char *` + ::lysc_ext_instance.parent - compiled restriction structure */ + LY_STMT_ERROR_MESSAGE = 0xD0000, /**< ::lysp_ext_substmt.storage - `const char *` + ::lysp_ext_instance.parent - `struct lysp_restr *` + ::lysc_ext_substmt.storage - `const char *` + ::lysc_ext_instance.parent - compiled restriction structure */ + LY_STMT_EXTENSION = 0xE0000, /**< ::lysp_ext_substmt.storage - `struct lysp_ext *`[] + ::lysp_ext_instance.parent - `struct lysp_ext *` + ::lysc_ext_substmt.storage - not compiled explicitly + ::lysc_ext_instance.parent - `struct lysc_ext *` */ + LY_STMT_EXTENSION_INSTANCE = 0xF0000, /**< ::lysp_ext_substmt.storage - `struct lysp_ext_instance *`[] + ::lysc_ext_substmt.storage - `struct lysc_ext_instance *`[] */ + LY_STMT_FEATURE = 0x100000, /**< ::lysp_ext_substmt.storage - `struct lysp_feature *`[] + ::lysp_ext_instance.parent - `struct lysp_feature *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - not compiled */ + LY_STMT_FRACTION_DIGITS = 0x110000, /**< ::lysp_ext_substmt.storage - `uint8_t *` + ::lysp_ext_instance.parent - `struct lysp_type *` + ::lysc_ext_substmt.storage - `uint8_t *` + ::lysc_ext_instance.parent - `struct lysc_type *` */ + LY_STMT_IDENTITY = 0x120000, /**< ::lysp_ext_substmt.storage - `struct lysp_ident *`[] + ::lysp_ext_instance.parent - `struct lysp_ident *` + ::lysc_ext_substmt.storage - `struct lysc_ident *`[] + ::lysc_ext_instance.parent - `struct lysc_ident *` */ + LY_STMT_IF_FEATURE = 0x130000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_qname *`[] + ::lysc_ext_substmt.storage - no storage, evaluated when compiled + ::lysc_ext_instance.parent - compiled parent statement */ + LY_STMT_IMPORT = 0x140000, /**< ::lysp_ext_substmt.storage - `struct lysp_import *`[] + ::lysp_ext_instance.parent - `struct lysp_import *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - not compiled */ + LY_STMT_INCLUDE = 0x150000, /**< ::lysp_ext_substmt.storage - `struct lysp_include *`[] + ::lysp_ext_instance.parent - `struct lysp_include *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - not compiled */ + LY_STMT_KEY = 0x160000, /**< ::lysp_ext_substmt.storage - `const char *` + ::lysp_ext_instance.parent - `struct lysp_node_list *` + ::lysc_ext_substmt.storage - `const char *` + ::lysc_ext_instance.parent - `struct lysc_node_list *` */ + LY_STMT_LENGTH = 0x170000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_restr *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_range *` */ + LY_STMT_MANDATORY = 0x180000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `uint16_t *` + ::lysc_ext_substmt.storage - `uint16_t *` + ::lysc_ext_instance.parent - `struct lysc_node *` */ + LY_STMT_MAX_ELEMENTS = 0x190000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `uint32_t *` + ::lysc_ext_substmt.storage - `uint32_t *` + ::lysc_ext_instance.parent - `struct lysc_node_list *` */ + LY_STMT_MIN_ELEMENTS = 0x1A0000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `uint32_t *` + ::lysc_ext_substmt.storage - `uint32_t *` + ::lysc_ext_instance.parent - `struct lysc_node_list *` */ + LY_STMT_MODIFIER = 0x1B0000, /**< ::lysp_ext_substmt.storage - `const char *` + ::lysp_ext_instance.parent - `struct lysp_restr *` + ::lysc_ext_substmt.storage - `const char *` + ::lysc_ext_instance.parent - `struct lysc_pattern *` */ + LY_STMT_MODULE = 0x1C0000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_module *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_module *` */ + LY_STMT_MUST = 0x1D0000, /**< ::lysp_ext_substmt.storage - `struct lysp_restr *`[] + ::lysp_ext_instance.parent - `struct lysp_restr *` + ::lysc_ext_substmt.storage - `struct lysc_must *`[] + ::lysc_ext_instance.parent - `struct lysc_must *` */ + LY_STMT_NAMESPACE = 0x1E0000, /**< ::lysp_ext_substmt.storage - `const char *` + ::lysp_ext_instance.parent - `struct lysp_module *` + ::lysc_ext_substmt.storage - `const char *` + ::lysc_ext_instance.parent - `struct lysc_module *` */ + LY_STMT_ORDERED_BY = 0x1F0000, /**< ::lysp_ext_substmt.storage - `uint16_t *` + ::lysp_ext_instance.parent - `struct lysp_node *` + ::lysc_ext_substmt.storage - `uint16_t *` + ::lysc_ext_instance.parent - `struct lysc_node *` */ + LY_STMT_ORGANIZATION = 0x200000, /**< ::lysp_ext_substmt.storage - `const char *` + ::lysp_ext_instance.parent - `struct lysp_(sub)module *` + ::lysc_ext_substmt.storage - `const char *` + ::lysc_ext_instance.parent - `struct lysc_module *` */ + LY_STMT_PATH = 0x210000, /**< ::lysp_ext_substmt.storage - `struct lyxp_expr *` + ::lysp_ext_instance.parent - `struct lysp_type *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_type *` */ + LY_STMT_PATTERN = 0x220000, /**< ::lysp_ext_substmt.storage - `struct lysp_restr *`[] + ::lysp_ext_instance.parent - `struct lysp_restr *` + ::lysc_ext_substmt.storage - `struct lysc_pattern **`[] + ::lysc_ext_instance.parent - `struct lysc_pattern *` */ + LY_STMT_POSITION = 0x230000, /**< ::lysp_ext_substmt.storage - `int64_t *` + ::lysp_ext_instance.parent - `struct lysp_type_enum *` + ::lysc_ext_substmt.storage - `int64_t *` + ::lysc_ext_instance.parent - `struct lysc_type_bitenum_item *` */ + LY_STMT_PREFIX = 0x240000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `const char *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_module *` */ + LY_STMT_PRESENCE = 0x250000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `const char *` + ::lysc_ext_substmt.storage - `const char *` + ::lysc_ext_instance.parent - `struct lysc_node_container *` */ + LY_STMT_RANGE = 0x260000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_restr *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_range *` */ + LY_STMT_REFERENCE = 0x270000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `const char *` + ::lysc_ext_substmt.storage - `const char *` + ::lysc_ext_instance.parent - compiled parent statement */ + LY_STMT_REFINE = 0x280000, /**< ::lysp_ext_substmt.storage - `struct lysp_refine *`[] + ::lysp_ext_instance.parent - `struct lysp_refine *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_node *` */ + LY_STMT_REQUIRE_INSTANCE = 0x290000, /**< ::lysp_ext_substmt.storage - `uint8_t *` + ::lysp_ext_instance.parent - `struct lysp_type *` + ::lysc_ext_substmt.storage - `uint8_t *` + ::lysc_ext_instance.parent - `struct lysc_type *` */ + LY_STMT_REVISION = 0x2A0000, /**< ::lysp_ext_substmt.storage - `struct lysp_revision *`[] + ::lysp_ext_instance.parent - `struct lysp_revision *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - not compiled */ + LY_STMT_REVISION_DATE = 0x2B0000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `const char *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - not compiled */ + LY_STMT_STATUS = 0x2C0000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `uint16_t *` + ::lysc_ext_substmt.storage - `uint16_t *` + ::lysc_ext_instance.parent - compiled parent statement */ + LY_STMT_SUBMODULE = 0x2D0000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_submodule *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_module *` */ + LY_STMT_TYPE = 0x2E0000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_type *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_type *` */ + LY_STMT_TYPEDEF = 0x2F0000, /**< ::lysp_ext_substmt.storage - `struct lysp_tpdf *`[] + ::lysp_ext_instance.parent - `struct lysp_tpdf *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_type *` */ + LY_STMT_UNIQUE = 0x300000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_qname *`[] + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_node_list *` */ + LY_STMT_UNITS = 0x310000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `const char *` + ::lysc_ext_substmt.storage - `const char *` + ::lysc_ext_instance.parent - `struct lysc_node *`, `struct lysc_type *` (typedef) */ + LY_STMT_VALUE = 0x320000, /**< ::lysp_ext_substmt.storage - `int64_t *` + ::lysp_ext_instance.parent - `struct lysp_type_enum *` + ::lysc_ext_substmt.storage - `int64_t *` + ::lysc_ext_instance.parent - `struct lysc_type_bitenum_item *` */ + LY_STMT_WHEN = 0x330000, /**< ::lysp_ext_substmt.storage and ::lysp_ext_instance.parent - `struct lysp_when *` + ::lysc_ext_substmt.storage and ::lysc_ext_instance.parent - `struct lysc_when *` */ + LY_STMT_YANG_VERSION = 0x340000, /**< ::lysp_ext_substmt.storage - `uint8_t *` + ::lysp_ext_instance.parent - `struct lysp_(sub)module *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_module *` */ + LY_STMT_YIN_ELEMENT = 0x350000, /**< ::lysp_ext_substmt.storage - `uint16_t *` + ::lysp_ext_instance.parent - `struct lysp_ext *` + ::lysc_ext_substmt.storage - not compiled + ::lysc_ext_instance.parent - `struct lysc_ext *` */ + + /* separated from the list of statements + * the following tokens are part of the syntax and parsers have to work + * with them, but they are not a standard YANG statements + */ + LY_STMT_SYNTAX_SEMICOLON, + LY_STMT_SYNTAX_LEFT_BRACE, + LY_STMT_SYNTAX_RIGHT_BRACE, + + /* + * YIN-specific tokens, still they are part of the syntax, but not the standard statements + */ + LY_STMT_ARG_TEXT, + LY_STMT_ARG_VALUE +}; + +/** + * @brief Structure representing a generic parsed YANG substatement in an extension instance. + */ +struct lysp_stmt { + const char *stmt; /**< identifier of the statement */ + const char *arg; /**< statement's argument */ + LY_VALUE_FORMAT format; /**< prefix format of the identifier/argument (::LY_VALUE_XML is YIN format) */ + void *prefix_data; /**< Format-specific data for prefix resolution (see ly_resolve_prefix()) */ + + struct lysp_stmt *next; /**< link to the next statement */ + struct lysp_stmt *child; /**< list of the statement's substatements (linked list) */ + uint16_t flags; /**< statement flags, can be set to LYS_YIN_ATTR */ + enum ly_stmt kw; /**< numeric respresentation of the stmt value */ +}; + +/** + * @brief Structure representing a parsed known YANG substatement in an extension instance. + */ +struct lysp_ext_substmt { + enum ly_stmt stmt; /**< parsed substatement */ + void *storage; /**< pointer to the parsed storage of the statement according to the specific + lys_ext_substmt::stmt */ +}; + +/** + * @brief YANG extension parsed instance. + */ +struct lysp_ext_instance { + const char *name; /**< extension identifier, including possible prefix */ + const char *argument; /**< optional value of the extension's argument */ + LY_VALUE_FORMAT format; /**< prefix format of the extension name/argument (::LY_VALUE_XML is YIN format) */ + void *prefix_data; /**< format-specific data for prefix resolution (see ly_resolve_prefix()) */ + struct lysp_ext *def; /**< pointer to the extension definition */ + + void *parent; /**< pointer to the parent statement holding the extension instance(s), use + ::lysp_ext_instance#parent_stmt to access the value/structure */ + enum ly_stmt parent_stmt; /**< type of the parent statement */ + LY_ARRAY_COUNT_TYPE parent_stmt_index; /**< index of the stamenet in case the parent does not point to the parent + statement directly and it is an array */ + uint16_t flags; /**< ::LYS_INTERNAL value (@ref snodeflags) */ + + const struct lyplg_ext_record *record; /**< extension definition plugin record, if any */ + struct lysp_ext_substmt *substmts; /**< list of supported known YANG statements with the pointer to their + parsed data ([sized array](@ref sizedarrays)) */ + void *parsed; /**< private plugin parsed data */ + struct lysp_stmt *child; /**< list of generic (unknown) YANG statements */ +}; + +/** + * @brief Structure representing a compiled known YANG substatement in an extension instance. + */ +struct lysc_ext_substmt { + enum ly_stmt stmt; /**< compiled substatement */ + void *storage; /**< pointer to the compiled storage of the statement according to the specific + lys_ext_substmt::stmt */ +}; + +/** + * @brief YANG extension compiled instance. + */ +struct lysc_ext_instance { + struct lysc_ext *def; /**< pointer to the extension definition */ + const char *argument; /**< optional value of the extension's argument */ + struct lys_module *module; /**< module where the extension instantiated is defined */ + struct lysc_ext_instance *exts; /**< list of the extension instances ([sized array](@ref sizedarrays)) */ + + void *parent; /**< pointer to the parent element holding the extension instance(s), use + ::lysc_ext_instance#parent_stmt to access the value/structure */ + enum ly_stmt parent_stmt; /**< type of the parent statement */ + LY_ARRAY_COUNT_TYPE parent_stmt_index; /**< index of the stamenet in case the parent does not point to the parent + statement directly and it is an array */ + + struct lysc_ext_substmt *substmts; /**< list of supported known YANG statements with the pointer to their + compiled data ([sized array](@ref sizedarrays)) */ + void *compiled; /**< private plugin compiled data */ +}; + +/** + * @brief Macro to define plugin information in external plugins + * + * Use as follows: + * LYPLG_EXTENSIONS = {{<filled information of ::lyplg_ext_record>}, ..., {0}}; + */ +#define LYPLG_EXTENSIONS \ + uint32_t plugins_extensions_apiver__ = LYPLG_EXT_API_VERSION; \ + const struct lyplg_ext_record plugins_extensions__[] + +/** + * @defgroup pluginsExtensionsParse Plugins: Extensions parsing support + * @ingroup pluginsExtensions + * + * Implementing extension plugin parse callback. + * + * @{ + */ + +/** + * @brief Callback for parsing extension instance substatements. + * + * All known YANG substatements can easily be parsed using ::lyplg_ext_parse_extension_instance. + * + * @param[in] pctx Parse context. + * @param[in,out] ext Parsed extension instance data. + * @return LY_SUCCESS on success. + * @return LY_ENOT if the extension instance is not supported and should be removed. + * @return LY_ERR error on error. + */ +typedef LY_ERR (*lyplg_ext_parse_clb)(struct lysp_ctx *pctx, struct lysp_ext_instance *ext); + +/** + * @brief Log a message from an extension plugin using the parsed extension instance. + * + * @param[in] pctx Parse context to use. + * @param[in] ext Parsed extensiopn instance. + * @param[in] level Log message level (error, warning, etc.) + * @param[in] err_no Error type code. + * @param[in] format Format string to print. + * @param[in] ... Format variable parameters. + */ +LIBYANG_API_DECL void lyplg_ext_parse_log(const struct lysp_ctx *pctx, const struct lysp_ext_instance *ext, + LY_LOG_LEVEL level, LY_ERR err_no, const char *format, ...); + +/** + * @brief Get current parsed module from a parse context. + * + * @param[in] pctx Parse context. + * @return Current (local) parse mod. + */ +LIBYANG_API_DECL const struct lysp_module *lyplg_ext_parse_get_cur_pmod(const struct lysp_ctx *pctx); + +/** + * @brief Parse substatements of an extension instance. + * + * Uses standard libyang schema compiler to transform YANG statements into the parsed schema structures. The plugins are + * supposed to use this function when the extension instance's substatements can be parsed in a standard way. + * + * @param[in] pctx Parse context. + * @param[in,out] ext Parsed extension instance with the prepared ::lysp_ext_instance.substmts array, which will be + * updated by storing the parsed data. + * @return LY_SUCCESS on success. + * @return LY_ERR error on error. + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_parse_extension_instance(struct lysp_ctx *pctx, struct lysp_ext_instance *ext); + +/** @} pluginsExtensionsParse */ + +/** + * @defgroup pluginsExtensionsCompile Plugins: Extensions compilation support + * @ingroup pluginsExtensions + * + * Implementing extension plugin compile callback. + * + * @{ + */ + +/** + * @defgroup scflags Schema compile flags + * + * Flags to modify schema compilation process and change the way how the particular statements are being compiled. * + * @{ + */ +#define LYS_COMPILE_GROUPING 0x01 /**< Compiling (validation) of a non-instantiated grouping. + In this case not all the restrictions are checked since they can + be valid only in the real placement of the grouping. This is + the case of any restriction that needs to look out of the statements + themselves, since the context is not known. */ +#define LYS_COMPILE_DISABLED 0x02 /**< Compiling a disabled subtree (by its if-features). Meaning + it will be removed at the end of compilation and should not be + added to any unres sets. */ +#define LYS_COMPILE_NO_CONFIG 0x04 /**< ignore config statements, neither inherit config value */ +#define LYS_COMPILE_NO_DISABLED 0x08 /**< ignore if-feature statements */ + +#define LYS_COMPILE_RPC_INPUT (LYS_IS_INPUT | LYS_COMPILE_NO_CONFIG) /**< Internal option when compiling schema tree of RPC/action input */ +#define LYS_COMPILE_RPC_OUTPUT (LYS_IS_OUTPUT | LYS_COMPILE_NO_CONFIG) /**< Internal option when compiling schema tree of RPC/action output */ +#define LYS_COMPILE_NOTIFICATION (LYS_IS_NOTIF | LYS_COMPILE_NO_CONFIG) /**< Internal option when compiling schema tree of Notification */ + +/** @} scflags */ + +/** + * @brief Callback to compile extension from the lysp_ext_instance to the lysc_ext_instance. The later structure is generally prepared + * and only the extension specific data are supposed to be added (if any). + * + * The parsed generic statements can be processed by the callback on its own or the ::lyplg_ext_compile_extension_instance() + * function can be used to let the compilation to libyang following the standard rules for processing the YANG statements. + * + * @param[in] cctx Current compile context. + * @param[in] extp Parsed extension instance data. + * @param[in,out] ext Prepared compiled extension instance structure where an addition, extension-specific, data are + * supposed to be placed for later use (data validation or use of external tool). + * @return LY_SUCCESS in case of success. + * @return LY_ENOT in case the extension instance is not supported and should be removed. + * @return LY_ERR error on error. + */ +typedef LY_ERR (*lyplg_ext_compile_clb)(struct lysc_ctx *cctx, const struct lysp_ext_instance *extp, + struct lysc_ext_instance *ext); + +/** + * @brief Log a message from an extension plugin using the compiled extension instance. + * + * @param[in] cctx Optional compile context to generate the path from. + * @param[in] ext Compiled extension instance. + * @param[in] level Log message level (error, warning, etc.) + * @param[in] err_no Error type code. + * @param[in] format Format string to print. + */ +LIBYANG_API_DECL void lyplg_ext_compile_log(const struct lysc_ctx *cctx, const struct lysc_ext_instance *ext, + LY_LOG_LEVEL level, LY_ERR err_no, const char *format, ...); + +/** + * @brief Log a message from an extension plugin using the compiled extension instance with an explicit error path. + * + * @param[in] path Log error path to use. + * @param[in] ext Compiled extension instance. + * @param[in] level Log message level (error, warning, etc.) + * @param[in] err_no Error type code. + * @param[in] format Format string to print. + */ +LIBYANG_API_DECL void lyplg_ext_compile_log_path(const char *path, const struct lysc_ext_instance *ext, + LY_LOG_LEVEL level, LY_ERR err_no, const char *format, ...); + +/** + * @brief YANG schema compilation context getter for libyang context. + * + * @param[in] ctx YANG schema compilation context. + * @return libyang context connected with the compilation context. + */ +LIBYANG_API_DECL struct ly_ctx *lyplg_ext_compile_get_ctx(const struct lysc_ctx *ctx); + +/** + * @brief YANG schema compilation context getter for compilation options. + * + * @param[in] ctx YANG schema compilation context. + * @return pointer to the compilation options to allow modifying them with @ref scflags values. + */ +LIBYANG_API_DECL uint32_t *lyplg_ext_compile_get_options(const struct lysc_ctx *ctx); + +/** + * @brief YANG schema compilation context getter for current module. + * + * @param[in] ctx YANG schema compilation context. + * @return current module. + */ +LIBYANG_API_DECL const struct lys_module *lyplg_ext_compile_get_cur_mod(const struct lysc_ctx *ctx); + +/** + * @brief YANG schema compilation context getter for currently processed module. + * + * @param[in] ctx YANG schema compilation context. + * @return Currently processed module. + */ +LIBYANG_API_DECL struct lysp_module *lyplg_ext_compile_get_pmod(const struct lysc_ctx *ctx); + +/** + * @brief Compile substatements of an extension instance. + * + * Uses standard libyang schema compiler to transform YANG statements into the compiled schema structures. The plugins are + * supposed to use this function when the extension instance's substatements are supposed to be compiled in a standard way + * (or if just the @ref scflags are enough to modify the compilation process). + * + * @param[in] ctx Compile context. + * @param[in] extp Parsed representation of the extension instance being processed. + * @param[in,out] ext Compiled extension instance with the prepared ::lysc_ext_instance.substmts array, which will be updated + * by storing the compiled data. + * @return LY_SUCCESS on success. + * @return LY_EVALID if compilation of the substatements fails. + * @return LY_ENOT if the extension is disabled (by if-feature) and should be ignored. + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_compile_extension_instance(struct lysc_ctx *ctx, const struct lysp_ext_instance *extp, + struct lysc_ext_instance *ext); + +/** @} pluginsExtensionsCompile */ + +/** + * @defgroup pluginsExtensionsSprinterInfo Plugins: Extensions schema info printer support + * @ingroup pluginsExtensions + * + * Implementing extension plugin schema info printer callback. + * + * @{ + */ + +/** + * @brief Callback to print the compiled extension instance's private data in the INFO format. + * + * @param[in] ctx YANG printer context to provide output handler and other information for printing. + * @param[in] ext The compiled extension instance, mainly to access the extensions. + * @param[in,out] flag Flag to be shared with the caller regarding the opening brackets - 0 if the '{' not yet printed, + * 1 otherwise. + * @return LY_SUCCESS when everything was fine, other LY_ERR values in case of failure + */ +typedef LY_ERR (*lyplg_ext_sprinter_info_clb)(struct lyspr_ctx *ctx, struct lysc_ext_instance *ext, ly_bool *flag); + +/** + * @brief YANG printer context getter for output handler. + * + * @param[in] ctx YANG printer context. + * @return Output handler where the data are being printed. Note that the address of the handler pointer in the context is + * returned to allow to modify the handler. + */ +LIBYANG_API_DECL struct ly_out **lyplg_ext_print_get_out(const struct lyspr_ctx *ctx); + +/** + * @brief YANG printer context getter for printer options. + * + * @param[in] ctx YANG printer context. + * @return pointer to the printer options to allow modifying them with @ref schemaprinterflags values. + */ +LIBYANG_API_DECL uint32_t *lyplg_ext_print_get_options(const struct lyspr_ctx *ctx); + +/** + * @brief YANG printer context getter for printer indentation level. + * + * @param[in] ctx YANG printer context. + * @return pointer to the printer's indentation level to allow modifying its value. + */ +LIBYANG_API_DECL uint16_t *lyplg_ext_print_get_level(const struct lyspr_ctx *ctx); + +/** + * @brief Print substatements of an extension instance in info format (compiled YANG). + * + * Generic function to access YANG printer functions from the extension plugins (::lyplg_ext_sprinter_info_clb). + * + * @param[in] ctx YANG printer context to provide output handler and other information for printing. + * @param[in] ext The compiled extension instance to access the extensions and substatements data. + * @param[in,out] flag Flag to be shared with the caller regarding the opening brackets - 0 if the '{' not yet printed, + * 1 otherwise. + */ +LIBYANG_API_DECL void lyplg_ext_print_info_extension_instance(struct lyspr_ctx *ctx, const struct lysc_ext_instance *ext, + ly_bool *flag); + +/** @} pluginsExtensionsSprinterInfo */ + +/** + * @defgroup pluginsExtensionsSprinterTree Plugins: Extensions schema parsed and compiled tree printer support + * @ingroup pluginsExtensions + * + * Implementing extension plugin schema parsed and compiled tree printer callback. + * + * @{ + */ + +/** + * @brief Callback to print parent node of @p ext or to print the contents of the extension. + * + * Function is called in two different cases. If the printer_tree needs the tree-diagram form of a parent node, + * then @p ctx is set to NULL. In the second case, if printer_tree needs to print the contents of the extension, + * then @p ctx is set and function must prepare the nodes that should be printed using the + * lyplg_ext_sprinter_tree* functions. + * + * @param[in] ext Extension instance. + * @param[in,out] ctx Context for the tree printer. Extension contents can be inserted into it by functions + * lyplg_ext_sprinter_ctree_add_ext_nodes(), lyplg_ext_sprinter_ctree_add_nodes() or by their ptree alternatives. + * It parameter is set to NULL, then @p flags and @p add_opts are used by printer_tree. + * @param[out] flags Optional override tree-diagram \<flags\> in a parent node. If @p ctx is set, ignore this parameter. + * @param[out] add_opts Additional tree-diagram \<opts\> string in a parent node which is printed before \<opts\>. If @p ctx + * is set, ignore this parameter. + * @return LY_ERR value. + */ +typedef LY_ERR (*lyplg_ext_sprinter_ctree_clb)(struct lysc_ext_instance *ext, const struct lyspr_tree_ctx *ctx, + const char **flags, const char **add_opts); + +/** + * @brief Callback for rewriting the tree-diagram form of a specific node. + * + * If this callback is set, then it is called for each node that belongs to the extension instance. + * + * @param[in] node Node whose tree-diagram form can be modified by the function. + * @param[in,out] plugin_priv Private context set by plugin. + * @param[out] skip Flag set to 1 removes the node from printed diagram. + * @param[out] flags Override tree-diagram \<flags\> string in the @p node. + * @param[out] add_opts Additional tree-diagram \<opts\> string in the @p node which is printed before \<opts\>. + * @return LY_ERR value. + */ +typedef LY_ERR (*lyplg_ext_sprinter_ctree_override_clb)(const struct lysc_node *node, const void *plugin_priv, + ly_bool *skip, const char **flags, const char **add_opts); + +/** + * @brief Registration of printing a group of nodes, which is already in the extension. + * + * @param[in] ctx Context of printer_tree in which the group of nodes is saved and later printed. + * @param[in] ext Extension in which the group of nodes will be searched. + * @param[in] clb Override function that will be applied to each delivered node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_sprinter_ctree_add_ext_nodes(const struct lyspr_tree_ctx *ctx, + struct lysc_ext_instance *ext, lyplg_ext_sprinter_ctree_override_clb clb); + +/** + * @brief Registration of printing the group of nodes which were defined in the plugin. + * + * @param[in] ctx Context of printer_tree in which the group of nodes is saved and later printed. + * @param[in] nodes Points to the first node in group. + * @param[in] clb Override function that will be applied to each delivered node. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_sprinter_ctree_add_nodes(const struct lyspr_tree_ctx *ctx, struct lysc_node *nodes, + lyplg_ext_sprinter_ctree_override_clb clb); + +/** + * @brief Registration of plugin-private data defined by the plugin that is shared between override_clb calls. + * + * @param[in] ctx Context of printer_tree in which plugin-private data will be saved. + * @param[in] plugin_priv Plugin-private data shared between oberride_clb calls. + * @param[in] free_clb Release function for @p plugin_priv. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_sprinter_tree_set_priv(const struct lyspr_tree_ctx *ctx, void *plugin_priv, + void (*free_clb)(void *plugin_priv)); + +/** + * @copydoc lyplg_ext_sprinter_ctree_clb + */ +typedef LY_ERR (*lyplg_ext_sprinter_ptree_clb)(struct lysp_ext_instance *ext, const struct lyspr_tree_ctx *ctx, + const char **flags, const char **add_opts); + +/** + * @copydoc lyplg_ext_sprinter_ctree_override_clb + */ +typedef LY_ERR (*lyplg_ext_sprinter_ptree_override_clb)(const struct lysp_node *node, const void *plugin_priv, + ly_bool *skip, const char **flags, const char **add_opts); + +/** + * @copydoc lyplg_ext_sprinter_ctree_add_ext_nodes + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_sprinter_ptree_add_ext_nodes(const struct lyspr_tree_ctx *ctx, + struct lysp_ext_instance *ext, lyplg_ext_sprinter_ptree_override_clb clb); + +/** + * @copydoc lyplg_ext_sprinter_ctree_add_nodes + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_sprinter_ptree_add_nodes(const struct lyspr_tree_ctx *ctx, struct lysp_node *nodes, + lyplg_ext_sprinter_ptree_override_clb clb); + +/** @} pluginsExtensionsSprinterTree */ + +/* + * data node + */ + +/** + * @brief Callback called for all data nodes connected to the extension instance. + * + * Can be used for additional data node validation. Is called only after the whole data tree is created and standard + * validation succeeds. Not called when parsing data and ::LYD_PARSE_ONLY is used. + * + * @param[in] ext Compiled extension instance. + * @param[in] node Data node to process. + * @param[in] validate_options Options used for the validation phase, see @ref datavalidationoptions. + * @return LY_SUCCESS on success. + * @return LY_ERR on error. + */ +typedef LY_ERR (*lyplg_ext_data_node_clb)(struct lysc_ext_instance *ext, struct lyd_node *node, uint32_t validate_options); + +/* + * snode + */ + +/** + * @brief Callback for getting a schema node for a new YANG instance data described by an extension instance. + * Needed only if the extension instance supports some nested standard YANG data. + * + * @param[in] ext Compiled extension instance. + * @param[in] parent Parsed parent data node. Set if @p sparent is NULL. + * @param[in] sparent Schema parent node. Set if @p parent is NULL. + * @param[in] prefix Element prefix, if any. + * @param[in] prefix_len Length of @p prefix. + * @param[in] format Format of @p prefix. + * @param[in] prefix_data Format-specific prefix data. + * @param[in] name Element name. + * @param[in] name_len Length of @p name. + * @param[out] snode Schema node to use for parsing the node. + * @return LY_SUCCESS on success. + * @return LY_ENOT if the data are not described by @p ext. + * @return LY_ERR on error. + */ +typedef LY_ERR (*lyplg_ext_data_snode_clb)(struct lysc_ext_instance *ext, const struct lyd_node *parent, + const struct lysc_node *sparent, const char *prefix, size_t prefix_len, LY_VALUE_FORMAT format, void *prefix_data, + const char *name, size_t name_len, const struct lysc_node **snode); + +/* + * validate + */ + +/** + * @brief Callback for validating parsed YANG instance data described by an extension instance. + * + * This callback is used only for nested data definition (with a standard YANG schema parent). + * + * @param[in] ext Compiled extension instance. + * @param[in] sibling First sibling with schema node returned by ::lyplg_ext_data_snode_clb. + * @param[in] dep_tree Tree to be used for validating references from the operation subtree, if operation. + * @param[in] data_type Validated data type, can be ::LYD_TYPE_DATA_YANG, ::LYD_TYPE_RPC_YANG, ::LYD_TYPE_NOTIF_YANG, + * or ::LYD_TYPE_REPLY_YANG. + * @param[in] val_opts Validation options, see @ref datavalidationoptions. + * @param[out] diff Optional diff with any changes made by the validation. + * @return LY_SUCCESS on success. + * @return LY_ERR on error. + */ +typedef LY_ERR (*lyplg_ext_data_validate_clb)(struct lysc_ext_instance *ext, struct lyd_node *sibling, + const struct lyd_node *dep_tree, enum lyd_type data_type, uint32_t val_opts, struct lyd_node **diff); + +/* + * parse free + */ + +/** + * @brief Callback to free the extension-specific data created by its parsing. + * + * @param[in] ctx libyang context. + * @param[in,out] ext Parsed extension structure to free. + */ +typedef void (*lyplg_ext_parse_free_clb)(const struct ly_ctx *ctx, struct lysp_ext_instance *ext); + +/** + * @brief Free the extension instance's data parsed with ::lyplg_ext_parse_extension_instance(). + * + * @param[in] ctx libyang context + * @param[in] substmts Extension instance substatements to free. + */ +LIBYANG_API_DECL void lyplg_ext_pfree_instance_substatements(const struct ly_ctx *ctx, struct lysp_ext_substmt *substmts); + +/* + * compile free + */ + +/** + * @brief Callback to free the extension-specific data created by its compilation. + * + * @param[in] ctx libyang context. + * @param[in,out] ext Compiled extension structure to free. + */ +typedef void (*lyplg_ext_compile_free_clb)(const struct ly_ctx *ctx, struct lysc_ext_instance *ext); + +/** + * @brief Free the extension instance's data compiled with ::lyplg_ext_compile_extension_instance(). + * + * @param[in] ctx libyang context + * @param[in] substmts Extension instance substatements to free. + */ +LIBYANG_API_DECL void lyplg_ext_cfree_instance_substatements(const struct ly_ctx *ctx, struct lysc_ext_substmt *substmts); + +/** + * @brief Extension plugin implementing various aspects of a YANG extension + */ +struct lyplg_ext { + const char *id; /**< plugin identification (mainly for distinguish incompatible versions + of the plugins for external tools) */ + lyplg_ext_parse_clb parse; /**< callback to parse the extension instance substatements */ + lyplg_ext_compile_clb compile; /**< callback to compile extension instance from the parsed data */ + lyplg_ext_sprinter_info_clb printer_info; /**< callback to print the compiled content (info format) of the extension + instance */ + lyplg_ext_sprinter_ctree_clb printer_ctree; /**< callback to print tree format of compiled node containing the + compiled content of the extension instance */ + lyplg_ext_sprinter_ptree_clb printer_ptree; /**< callback to print tree format of parsed node containing the + parsed content of the extension instance */ + lyplg_ext_data_node_clb node; /**< callback to validate most relevant data instance for the extension + instance */ + lyplg_ext_data_snode_clb snode; /**< callback to get schema node for nested YANG data */ + lyplg_ext_data_validate_clb validate; /**< callback to validate parsed data instances according to the extension + definition */ + + lyplg_ext_parse_free_clb pfree; /**< free the extension-specific data created by its parsing */ + lyplg_ext_compile_free_clb cfree; /**< free the extension-specific data created by its compilation */ +}; + +struct lyplg_ext_record { + /* plugin identification */ + const char *module; /**< name of the module where the extension is defined */ + const char *revision; /**< optional module revision - if not specified, the plugin applies to any revision, + which is not an optimal approach due to a possible future revisions of the module. + Instead, there should be defined multiple items in the plugins list, each with the + different revision, but all with the same pointer to the plugin functions. The + only valid use case for the NULL revision is the case the module has no revision. */ + const char *name; /**< YANG name of the extension */ + + /* runtime data */ + struct lyplg_ext plugin; /**< data to utilize plugin implementation */ +}; + +/** + * @brief Stringify statement identifier. + * + * @param[in] stmt The statement identifier to stringify. + * @return Constant string representation of the given @p stmt. + */ +LIBYANG_API_DECL const char *lyplg_ext_stmt2str(enum ly_stmt stmt); + +/** + * @brief Convert nodetype to statement identifier + * + * @param[in] nodetype Nodetype to convert. + * @return Statement identifier representing the given @p nodetype. + */ +LIBYANG_API_DECL enum ly_stmt lyplg_ext_nodetype2stmt(uint16_t nodetype); + +/** + * @brief Get compiled ext instance storage for a specific statement. + * + * @param[in] ext Compiled ext instance. + * @param[in] stmt Compiled statement. Can be a mask when the first match is returned, it is expected the storage is + * the same for all the masked statements. + * @param[in] storage_size Size of the value at @p storage address (dereferenced). + * @param[out] storage Compiled ext instance substatement storage, NULL if was not compiled. + * @return LY_SUCCESS on success. + * @return LY_ENOT if the substatement is not supported. + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_get_storage(const struct lysc_ext_instance *ext, int stmt, uint32_t storage_size, + const void **storage); + +/** + * @brief Get parsed ext instance storage for a specific statement. + * + * @param[in] ext Compiled ext instance. + * @param[in] stmt Parsed statement. Can be a mask when the first match is returned, it is expected the storage is + * the same for all the masked statements. + * @param[in] storage_size Size of the value at @p storage address (dereferenced). + * @param[out] storage Parsed ext instance substatement storage, NULL if was not parsed. + * @return LY_SUCCESS on success. + * @return LY_ENOT if the substatement is not supported. + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_parsed_get_storage(const struct lysc_ext_instance *ext, int stmt, + uint32_t storage_size, const void **storage); + +/** + * @brief Get specific run-time extension instance data from a callback set by ::ly_ctx_set_ext_data_clb(). + * + * @param[in] ctx Context with the callback. + * @param[in] ext Compiled extension instance. + * @param[out] ext_data Provided extension instance data. + * @param[out] ext_data_free Whether the extension instance should free @p ext_data or not. + * @return LY_SUCCESS on success. + * @return LY_ERR on error. + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_get_data(const struct ly_ctx *ctx, const struct lysc_ext_instance *ext, void **ext_data, + ly_bool *ext_data_free); + +/** + * @brief Insert extension instance data into a parent. + * + * @param[in] parent Parent node to insert into. + * @param[in] first First top-level sibling node to insert. + * @return LY_SUCCESS on success. + * @return LY_ERR error on error. + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_insert(struct lyd_node *parent, struct lyd_node *first); + +/** + * @brief Expand parent-reference xpath expressions + * + * @param[in] ext Context allocated for extension. + * @param[out] refs Set of schema node matching parent-reference XPaths. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_schema_mount_get_parent_ref(const struct lysc_ext_instance *ext, struct ly_set **refs); + +/** + * @brief Allocate a new context for a particular instance of the yangmnt:mount-point extension. + * Caller is responsible for destroying the resulting context. + * + * @param[in] ext Compiled extension instance. + * @param[out] ctx A context with modules loaded from the list found in + * the extension data. + * @return LY_ERR value. + */ +LIBYANG_API_DECL LY_ERR lyplg_ext_schema_mount_create_context(const struct lysc_ext_instance *ext, struct ly_ctx **ctx); + +/** @} pluginsExtensions */ + +#ifdef __cplusplus +} +#endif + +#endif /* LY_PLUGINS_EXTS_H_ */ |