Adding upstream version 3.1.0+dfsg.upstream/3.1.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 745 insertions, 0 deletions

diff --git a/src/tree_schema_internal.h b/src/tree_schema_internal.h
new file mode 100644
index 0000000..d3e399c
--- /dev/null
+++ b/src/tree_schema_internal.h
@@ -0,0 +1,745 @@
+/**
+ * @file tree_schema_internal.h
+ * @author Radek Krejci <rkrejci@cesnet.cz>
+ * @brief internal functions for YANG schema 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_SCHEMA_INTERNAL_H_
+#define LY_TREE_SCHEMA_INTERNAL_H_
+
+#include <stdint.h>
+
+#include "ly_common.h"
+#include "set.h"
+#include "tree_schema.h"
+
+struct lysc_ctx;
+struct lys_glob_unres;
+
+#define LY_YANG_SUFFIX ".yang"
+#define LY_YANG_SUFFIX_LEN 5
+#define LY_YIN_SUFFIX ".yin"
+#define LY_YIN_SUFFIX_LEN 4
+
+#define YIN_NS_URI "urn:ietf:params:xml:ns:yang:yin:1"
+
+#define LY_PCRE2_MSG_LIMIT 256
+
+/**
+ * @brief The maximum depth at which the last nested block is located.
+ * Designed to protect against corrupted input that causes a stack-overflow error.
+ * For yang language and json format, the block is bounded by "{ }".
+ * For the xml format, the opening and closing element tag is considered as the block.
+ */
+#define LY_MAX_BLOCK_DEPTH 500
+
+/* list of the deviate modifications strings */
+extern const char * const ly_devmod_list[];
+#define ly_devmod2str(TYPE) ly_devmod_list[TYPE]
+
+/**
+ * @brief Check module version is at least 2 (YANG 1.1) because of the keyword presence.
+ * Logs error message and returns LY_EVALID in case of module in YANG version 1.0.
+ * @param[in] CTX yang parser context to get current module and for logging.
+ * @param[in] KW keyword allowed only in YANG version 1.1 (or later) - for logging.
+ * @param[in] PARENT parent statement where the KW is present - for logging.
+ */
+#define PARSER_CHECK_STMTVER2_RET(CTX, KW, PARENT) \
+    if (PARSER_CUR_PMOD(CTX)->version < LYS_VERSION_1_1) {LOGVAL_PARSER((CTX), LY_VCODE_INCHILDSTMT2, KW, PARENT); return LY_EVALID;}
+
+/* These 2 macros checks YANG's identifier grammar rule */
+#define is_yangidentstartchar(c) ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_')
+#define is_yangidentchar(c) ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || \
+                              c == '_' || c == '-' || c == '.')
+
+/* Macro to check YANG's yang-char grammar rule */
+#define is_yangutf8char(c) ((c >= 0x20 && c <= 0xd7ff) || c == 0x09 || c == 0x0a || c == 0x0d || \
+                            (c >= 0xe000 && c <= 0xfdcf)   || (c >= 0xfdf0 && c <= 0xfffd)   || \
+                            (c >= 0x10000 && c <= 0x1fffd) || (c >= 0x20000 && c <= 0x2fffd) || \
+                            (c >= 0x30000 && c <= 0x3fffd) || (c >= 0x40000 && c <= 0x2fffd) || \
+                            (c >= 0x50000 && c <= 0x5fffd) || (c >= 0x60000 && c <= 0x6fffd) || \
+                            (c >= 0x70000 && c <= 0x7fffd) || (c >= 0x80000 && c <= 0x8fffd) || \
+                            (c >= 0x90000 && c <= 0x9fffd) || (c >= 0xa0000 && c <= 0xafffd) || \
+                            (c >= 0xb0000 && c <= 0xbfffd) || (c >= 0xc0000 && c <= 0xcfffd) || \
+                            (c >= 0xd0000 && c <= 0xdfffd) || (c >= 0xe0000 && c <= 0xefffd) || \
+                            (c >= 0xf0000 && c <= 0xffffd) || (c >= 0x100000 && c <= 0x10fffd))
+
+/**
+ * @brief Try to find object with MEMBER string matching the IDENT in the given ARRAY.
+ * Macro logs an error message and returns LY_EVALID in case of existence of a matching object.
+ *
+ * @param[in] CTX yang parser context for logging.
+ * @param[in] ARRAY [sized array](@ref sizedarrays) of a generic objects with member named MEMBER to search.
+ * @param[in] MEMBER Name of the member of the objects in the ARRAY to compare.
+ * @param[in] STMT Name of the compared YANG statements for logging.
+ * @param[in] IDENT String trying to find in the ARRAY's objects inside the MEMBER member.
+ */
+#define CHECK_UNIQUENESS(CTX, ARRAY, MEMBER, STMT, IDENT) \
+    if (ARRAY) { \
+        for (LY_ARRAY_COUNT_TYPE u_ = 0; u_ < LY_ARRAY_COUNT(ARRAY) - 1; ++u_) { \
+            if (!strcmp((ARRAY)[u_].MEMBER, IDENT)) { \
+                LOGVAL_PARSER(CTX, LY_VCODE_DUPIDENT, IDENT, STMT); \
+                return LY_EVALID; \
+            } \
+        } \
+    }
+
+#define CHECK_NONEMPTY(CTX, VALUE_LEN, STMT) \
+    if (!VALUE_LEN) { \
+        LOGWRN(PARSER_CTX(CTX), "Empty argument of %s statement does not make sense.", STMT); \
+    }
+
+/*
+ * Additional YANG constants
+ */
+#define Y_TAB_SPACES         8  /**< number of spaces instead of tab character */
+#define LY_TYPE_DEC64_FD_MAX 18 /**< Maximal value of decimal64's fraction-digits */
+
+/**
+ * @brief List of YANG statement groups - the (sub)module's substatements
+ */
+enum yang_module_stmt {
+    Y_MOD_MODULE_HEADER,
+    Y_MOD_LINKAGE,
+    Y_MOD_META,
+    Y_MOD_REVISION,
+    Y_MOD_BODY
+};
+
+/**
+ * @brief Types of arguments of YANG statements
+ */
+enum yang_arg {
+    Y_IDENTIF_ARG,        /**< YANG "identifier-arg-str" rule */
+    Y_PREF_IDENTIF_ARG,   /**< YANG "identifier-ref-arg-str" or node-identifier rule */
+    Y_STR_ARG,            /**< YANG "string" rule */
+    Y_MAYBE_STR_ARG       /**< optional YANG "string" rule */
+};
+
+#define PARSER_CUR_PMOD(CTX) ((struct lysp_module *)(CTX)->parsed_mods->objs[(CTX)->parsed_mods->count - 1])
+#define PARSER_CTX(CTX) ((CTX) ? PARSER_CUR_PMOD(CTX)->mod->ctx : NULL)
+#define LOGVAL_PARSER(CTX, ...) LOGVAL(PARSER_CTX(CTX), __VA_ARGS__)
+
+struct lysp_ctx {
+    LYS_INFORMAT format;             /**< parser format */
+    struct ly_set tpdfs_nodes;       /**< Set of nodes that contain typedef(s). Invalid in case of
+                                          submodule, use ::lysp_ctx.main_ctx instead. */
+    struct ly_set grps_nodes;        /**< Set of nodes that contain grouping(s). Invalid in case of
+                                          submodule, use ::lysp_ctx.main_ctx instead. */
+    struct ly_set ext_inst;          /**< parsed extension instances to finish parsing */
+
+    struct ly_set *parsed_mods;      /**< (sub)modules being parsed, the last one is the current */
+    struct lysp_ctx *main_ctx;       /**< This pointer must not be NULL. If this context deals with the submodule,
+                                          then should be set to the context of the module to which it belongs,
+                                          otherwise it points to the beginning of this structure. */
+};
+
+/**
+ * @brief Internal context for yang schema parser.
+ */
+struct lysp_yang_ctx {
+    LYS_INFORMAT format;             /**< parser format */
+    struct ly_set tpdfs_nodes;       /**< Set of nodes that contain typedef(s). Invalid in case of
+                                          submodule, use ::lysp_ctx.main_ctx instead. */
+    struct ly_set grps_nodes;        /**< Set of nodes that contain grouping(s). Invalid in case of
+                                          submodule, use ::lysp_ctx.main_ctx instead. */
+    struct ly_set ext_inst;          /**< parsed extension instances to finish parsing */
+
+    struct ly_set *parsed_mods;      /**< (sub)modules being parsed, the last one is the current */
+    struct lysp_ctx *main_ctx;       /**< This pointer must not be NULL. If this context deals with the submodule,
+                                          then should be set to the context of the module to which it belongs,
+                                          otherwise it points to the beginning of this structure. */
+    struct ly_in *in;                /**< input handler for the parser */
+    uint64_t indent;                 /**< current position on the line for YANG indentation */
+    uint32_t depth;                  /**< current number of nested blocks, see ::LY_MAX_BLOCK_DEPTH */
+};
+
+/**
+ * @brief Internal context for yin schema parser.
+ */
+struct lysp_yin_ctx {
+    LYS_INFORMAT format;             /**< parser format */
+    struct ly_set tpdfs_nodes;       /**< Set of nodes that contain typedef(s). Invalid in case of
+                                          submodule, use ::lysp_ctx.main_ctx instead. */
+    struct ly_set grps_nodes;        /**< Set of nodes that contain grouping(s). Invalid in case of
+                                          submodule, use ::lysp_ctx.main_ctx instead. */
+    struct ly_set ext_inst;          /**< parsed extension instances to finish parsing */
+
+    struct ly_set *parsed_mods;      /**< (sub)modules being parsed, the last one is the current */
+    struct lysp_ctx *main_ctx;       /**< This pointer must not be NULL. If this context deals with the submodule,
+                                          then should be set to the context of the module to which it belongs,
+                                          otherwise it points to the beginning of this structure. */
+    struct lyxml_ctx *xmlctx;        /**< context for xml parser */
+};
+
+/**
+ * @brief Check that @p c is valid UTF8 code point for YANG string.
+ *
+ * @param[in] ctx parser context for logging.
+ * @param[in] c UTF8 code point of a character to check.
+ * @return LY_ERR values.
+ */
+LY_ERR lysp_check_stringchar(struct lysp_ctx *ctx, uint32_t c);
+
+/**
+ * @brief Check that @p c is valid UTF8 code point for YANG identifier.
+ *
+ * @param[in] ctx parser context for logging. If NULL, does not log.
+ * @param[in] c UTF8 code point of a character to check.
+ * @param[in] first Flag to check the first character of an identifier, which is more restricted.
+ * @param[in,out] prefix Storage for internally used flag in case of possible prefixed identifiers:
+ * 0 - colon not yet found (no prefix)
+ * 1 - @p c is the colon character
+ * 2 - prefix already processed, now processing the identifier
+ *
+ * If the identifier cannot be prefixed, NULL is expected.
+ * @return LY_ERR values.
+ */
+LY_ERR lysp_check_identifierchar(struct lysp_ctx *ctx, uint32_t c, ly_bool first, uint8_t *prefix);
+
+/**
+ * @brief Check the currently present prefixes in the module for collision with the new one.
+ *
+ * @param[in] ctx Context for logging.
+ * @param[in] imports List of current imports of the module to check prefix collision.
+ * @param[in] module_prefix Prefix of the module to check collision.
+ * @param[in] value Newly added prefix value (including its location to distinguish collision with itself).
+ * @return LY_EEXIST when prefix is already used in the module, LY_SUCCESS otherwise
+ */
+LY_ERR lysp_check_prefix(struct lysp_ctx *ctx, struct lysp_import *imports, const char *module_prefix, const char **value);
+
+/**
+ * @brief Check date string (4DIGIT "-" 2DIGIT "-" 2DIGIT)
+ *
+ * @param[in] ctx Optional context for logging.
+ * @param[in] date Date string to check (non-necessarily terminated by \0)
+ * @param[in] date_len Length of the date string, 10 expected.
+ * @param[in] stmt Statement name for error message.
+ * @return LY_ERR value.
+ */
+LY_ERR lysp_check_date(struct lysp_ctx *ctx, const char *date, size_t date_len, const char *stmt);
+
+/**
+ * @brief Find type specified type definition.
+ *
+ * @param[in] id Name of the type including possible prefix. Module where the prefix is being searched is start_module.
+ * @param[in] start_node Context node where the type is being instantiated to be able to search typedefs in parents.
+ * @param[in] start_module Module where the type is being instantiated for search for typedefs.
+ * @param[in] ext Extension where the type is being instantiated, if any.
+ * @param[out] type Built-in type identifier of the id. If #LY_TYPE_UNKNOWN, tpdf is expected to contain found YANG schema typedef statement.
+ * @param[out] tpdf Found type definition.
+ * @param[out] node Node where the found typedef is defined, NULL in case of a top-level typedef.
+ * @return LY_ERR value.
+ */
+LY_ERR lysp_type_find(const char *id, struct lysp_node *start_node, const struct lysp_module *start_module,
+        const struct lysc_ext_instance *ext, LY_DATA_TYPE *type, const struct lysp_tpdf **tpdf, struct lysp_node **node);
+
+/**
+ * @brief Check names of typedefs in the parsed module to detect collisions.
+ *
+ * @param[in] ctx Parser context for logging and to maintain tpdfs_nodes
+ * @param[in] mod Module where the type is being defined.
+ * @return LY_ERR value.
+ */
+LY_ERR lysp_check_dup_typedefs(struct lysp_ctx *ctx, struct lysp_module *mod);
+
+/**
+ * @brief Check names of groupings in the parsed module to detect collisions.
+ *
+ * @param[in] ctx Parser context for logging and to maintain grps_nodes.
+ * @param[in] mod Module where the type is being defined.
+ * @return LY_ERR value.
+ */
+LY_ERR lysp_check_dup_groupings(struct lysp_ctx *ctx, struct lysp_module *mod);
+
+/**
+ * @brief Check names of features in the parsed module and submodules to detect collisions.
+ *
+ * @param[in] ctx Parser context.
+ * @param[in] mod Module where the type is being defined.
+ * @return LY_ERR value.
+ */
+LY_ERR lysp_check_dup_features(struct lysp_ctx *ctx, struct lysp_module *mod);
+
+/**
+ * @brief Check names of identities in the parsed module and submodules to detect collisions.
+ *
+ * @param[in] ctx Parser context.
+ * @param[in] mod Module where the type is being defined.
+ * @return LY_ERR value.
+ */
+LY_ERR lysp_check_dup_identities(struct lysp_ctx *ctx, struct lysp_module *mod);
+
+/**
+ * @brief Just move the newest revision into the first position, does not sort the rest
+ * @param[in] revs Sized-array of the revisions in a printable schema tree.
+ */
+void lysp_sort_revisions(struct lysp_revision *revs);
+
+/**
+ * @brief Validate enum name.
+ *
+ * @param[in] ctx yang parser context for logging.
+ * @param[in] name String to check.
+ * @param[in] name_len Length of name.
+ *
+ * @return LY_ERR values
+ */
+LY_ERR lysp_check_enum_name(struct lysp_ctx *ctx, const char *name, size_t name_len);
+
+/**
+ * @brief Find source data for a specific module, parse it, and add into the context.
+ *
+ * @param[in] ctx libyang context.
+ * @param[in] name Name of the module to load.
+ * @param[in] revision Optional revision of the module to load. If NULL, the newest revision is loaded.
+ * @param[in,out] new_mods Set of all the new mods added to the context. Includes this module and all of its imports.
+ * @param[out] mod Created module structure.
+ * @return LY_SUCCESS on success.
+ * @return LY_ERR on error.
+ */
+LY_ERR lys_parse_load(struct ly_ctx *ctx, const char *name, const char *revision, struct ly_set *new_mods,
+        struct lys_module **mod);
+
+/**
+ * @brief Parse included submodules into the simply parsed YANG module.
+ *
+ * YANG 1.0 does not require the main module to include all the submodules. Therefore, parsing submodules can cause
+ * reallocating and extending the includes array in the main module by the submodules included only in submodules.
+ *
+ * @param[in] pctx main parser context
+ * @param[in] pmod Parsed module with the includes array to be processed.
+ * @param[in,out] new_mods Set of all the new mods added to the context. Includes this module and all of its imports.
+ * @return LY_ERR value.
+ */
+LY_ERR lysp_load_submodules(struct lysp_ctx *pctx, struct lysp_module *pmod, struct ly_set *new_mods);
+
+/**
+ * @brief Get address of a node's actions list if any.
+ * Decides the node's type and in case it has an actions list, returns its address.
+ *
+ * @param[in] node Node to check.
+ * @return Address of the node's actions member if any, NULL otherwise.
+ */
+struct lysp_node_action **lysp_node_actions_p(struct lysp_node *node);
+
+/**
+ * @brief Get address of a node's notifications list if any.
+ * Decides the node's type and in case it has a notifications list, returns its address.
+ *
+ * @param[in] node Node to check.
+ * @return Address of the node's notifs member if any, NULL otherwise.
+ */
+struct lysp_node_notif **lysp_node_notifs_p(struct lysp_node *node);
+
+/**
+ * @brief Get address of a node's child pointer if any.
+ * Decides the node's type and in case it has a children list, returns its address.
+ *
+ * @param[in] node Node to check.
+ * @return Address of the node's child member if any, NULL otherwise.
+ */
+struct lysp_node **lysp_node_child_p(struct lysp_node *node);
+
+/**
+ * @brief Get the address of the node's musts member, if any.
+ * Decides the node's type and in case it has a musts member, returns its address.
+ *
+ * @param[in] node Node to examine.
+ * @return The address of the node's musts member if any, NULL otherwise.
+ */
+struct lysp_restr **lysp_node_musts_p(const struct lysp_node *node);
+
+/**
+ * @brief Get the node's musts member, if any.
+ * Decides the node's type and in case it has a musts member, returns its address.
+ *
+ * @param[in] node Node to examine.
+ * @return The node's musts member if any, NULL otherwise.
+ */
+struct lysp_restr *lysp_node_musts(const struct lysp_node *node);
+
+/**
+ * @brief Get the address of the node's when member, if any.
+ * Decides the node's type and in case it has a when, returns it.
+ *
+ * @param[in] node Node to examine.
+ * @return The address of the node's when member if any, NULL otherwise.
+ */
+struct lysp_when **lysp_node_when_p(const struct lysp_node *node);
+
+/**
+ * @brief Get the node's when member, if any.
+ * Decides the node's type and in case it has a when, returns it.
+ *
+ * @param[in] node Node to examine.
+ * @return The node's when member if any, NULL otherwise.
+ */
+struct lysp_when *lysp_node_when(const struct lysp_node *node);
+
+/**
+ * @brief Get address of a node's child pointer if any.
+ * Decides the node's type and in case it has a children list, returns its address.
+ *
+ * Do not use for RPC and action nodes.
+ *
+ * @param[in] node Node to check.
+ * @return Address of the node's child member if any, NULL otherwise.
+ */
+struct lysc_node **lysc_node_child_p(const struct lysc_node *node);
+
+/**
+ * @brief Get address of a node's notifs pointer if any.
+ * Decides the node's type and in case it has a notifs array, returns its address.
+ *
+ * @param[in] node Node to check.
+ * @return Address of the node's notifs member if any, NULL otherwise.
+ */
+struct lysc_node_notif **lysc_node_notifs_p(struct lysc_node *node);
+
+/**
+ * @brief Get address of a node's actions pointer if any.
+ * Decides the node's type and in case it has a actions array, returns its address.
+ *
+ * @param[in] node Node to check.
+ * @return Address of the node's actions member if any, NULL otherwise.
+ */
+struct lysc_node_action **lysc_node_actions_p(struct lysc_node *node);
+
+/**
+ * @brief Get address of a node's when member if any.
+ * Decides the node's type and in case it has a when member, returns its address.
+ *
+ * @param[in] node Node to check.
+ * @return Address of the node's when member if any, NULL otherwise.
+ */
+struct lysc_when ***lysc_node_when_p(const struct lysc_node *node);
+
+/**
+ * @brief Get address of a node's musts member if any.
+ * Decides the node's type and in case it has a musts member, returns its address.
+ *
+ * @param[in] node Node to check.
+ * @return Address of the node's musts member if any, NULL otherwise.
+ */
+struct lysc_must **lysc_node_musts_p(const struct lysc_node *node);
+
+/**
+ * @brief Find parsed extension definition for the given extension instance.
+ *
+ * @param[in] ctx libyang context.
+ * @param[in] ext Extension instance for which the definition will be searched.
+ * @param[out] ext_mod Module of the extension definition of @p ext.
+ * @param[out] ext_def Optional found extension definition.
+ * @return LY_SUCCESS when the definition was found.
+ * @return LY_EVALID when the extension instance is invalid and/or the definition not found.
+ */
+LY_ERR lysp_ext_find_definition(const struct ly_ctx *ctx, const struct lysp_ext_instance *ext, const struct lys_module **ext_mod,
+        struct lysp_ext **ext_def);
+
+/**
+ * @brief Get schema node in extension instance according to the given parameters.
+ *
+ * Wraps ::lys_getnext_ext() and match according to the given arguments.
+ *
+ * @param[in] ext Extension instance which top-level schema node is being searched.
+ * @param[in] module Optional parameter to match the extension instance's (and its data) module.
+ * @param[in] name Name of the schema node to find, if the string is not NULL-terminated, the @p name_len must be set.
+ * @param[in] name_len Length of the @p name string, use in case the @p name is not NULL-terminated string.
+ * @param[in] nodetype Allowed [type of the node](@ref schemanodetypes).
+ * @param[in] options ORed [lys_getnext options](@ref sgetnextflags).
+ * @return Found schema node if there is some satisfy the provided requirements.
+ */
+const struct lysc_node *lysc_ext_find_node(const struct lysc_ext_instance *ext, const struct lys_module *module,
+        const char *name, size_t name_len, uint16_t nodetype, uint32_t options);
+
+/**
+ * @brief When the module comes from YIN format, the argument name is unknown because of missing extension definition
+ * (it might come from import modules which is not yet parsed at that time). Therefore, all the attributes are stored
+ * as substatements and resolving argument is postponed.
+ *
+ * @param[in] ctx libyang context
+ * @param[in] ext_p Parsed extension to be updated.
+ * @return LY_ERR value.
+ */
+LY_ERR lysp_ext_instance_resolve_argument(struct ly_ctx *ctx, struct lysp_ext_instance *ext_p);
+
+/**
+ * @brief Iterate over the specified type of the extension instances
+ *
+ * @param[in] ext ([Sized array](@ref sizedarrays)) of extensions to explore
+ * @param[in] index Index in the @p ext array where to start searching (first call with 0, the consequent calls with
+ *            the returned index increased by 1 (until the iteration is not terminated by returning LY_ARRAY_COUNT(ext).
+ * @param[in] substmt The statement the extension is supposed to belong to.
+ * @result index in the ext array, LY_ARRAY_COUNT(ext) value if not present.
+ */
+LY_ARRAY_COUNT_TYPE lysp_ext_instance_iter(struct lysp_ext_instance *ext, LY_ARRAY_COUNT_TYPE index, enum ly_stmt substmt);
+
+/**
+ * @brief Stringify YANG built-in type.
+ *
+ * @param[in] basetype Built-in type ID to stringify.
+ * @return Constant string with the name of the built-in type.
+ */
+const char *lys_datatype2str(LY_DATA_TYPE basetype);
+
+/**
+ * @brief Implement a module and resolve all global unres.
+ *
+ * @param[in] mod Module to implement.
+ * @param[in] features Features to set, see ::lys_set_features().
+ * @param[in] unres Global unres with all the created modules.
+ * @return LY_SUCCESS on success.
+ * @return LY_ERR on error.
+ */
+LY_ERR _lys_set_implemented(struct lys_module *mod, const char **features, struct lys_glob_unres *unres);
+
+/**
+ * @brief Create dependency sets for all modules in a context.
+ * Also sets to_compile flags for all the modules that should be (re)compiled.
+ *
+ * @param[in] ctx Context to use.
+ * @param[in,out] main_set Set of dependency module sets.
+ * @param[in] mod Optional only module whose dependency set is needed, otherwise all sets are created.
+ * @return LY_ERR value.
+ */
+LY_ERR lys_unres_dep_sets_create(struct ly_ctx *ctx, struct ly_set *main_set, struct lys_module *mod);
+
+/**
+ * @brief Revert changes stored in global compile context after a failed compilation.
+ *
+ * @param[in] ctx libyang context.
+ * @param[in] unres Global unres to use.
+ */
+void lys_unres_glob_revert(struct ly_ctx *ctx, struct lys_glob_unres *unres);
+
+/**
+ * @brief Erase the global compile context.
+ *
+ * @param[in] unres Global unres to erase.
+ */
+void lys_unres_glob_erase(struct lys_glob_unres *unres);
+
+typedef LY_ERR (*lys_custom_check)(const struct ly_ctx *ctx, struct lysp_module *mod, struct lysp_submodule *submod,
+        void *check_data);
+
+/**
+ * @brief Parse a module and add it into the context.
+ *
+ * @param[in] ctx libyang context where to process the data model.
+ * @param[in] in Input structure.
+ * @param[in] format Format of the input data (YANG or YIN).
+ * @param[in] custom_check Callback to check the parsed schema before it is accepted.
+ * @param[in] check_data Caller's data to pass to the custom_check callback.
+ * @param[in,out] new_mods Set of all the new mods added to the context. Includes this module and all of its imports.
+ * @param[out] module Created module.
+ * @return LY_SUCCESS on success.
+ * @return LY_ERR on error, @p new_mods may be modified.
+ */
+LY_ERR lys_parse_in(struct ly_ctx *ctx, struct ly_in *in, LYS_INFORMAT format, lys_custom_check custom_check,
+        void *check_data, struct ly_set *new_mods, struct lys_module **module);
+
+/**
+ * @brief Parse submodule.
+ *
+ * The latest_revision flag of submodule is updated.
+ *
+ * @param[in] ctx libyang context where to process the data model.
+ * @param[in] in Input structure.
+ * @param[in] format Format of the input data (YANG or YIN).
+ * @param[in] main_ctx Parser context of the main module.
+ * @param[in] custom_check Callback to check the parsed schema before it is accepted.
+ * @param[in] check_data Caller's data to pass to the custom_check callback.
+ * @param[in] new_mods Set of all the new mods added to the context. Includes this module and all of its imports.
+ * @param[out] submodule Parsed submodule.
+ * @return LY_ERR value.
+ */
+LY_ERR lys_parse_submodule(struct ly_ctx *ctx, struct ly_in *in, LYS_INFORMAT format, struct lysp_ctx *main_ctx,
+        lys_custom_check custom_check, void *check_data, struct ly_set *new_mods, struct lysp_submodule **submodule);
+
+/**
+ * @brief Fill filepath value if available in input handler @p in
+ *
+ * @param[in] ctx Context with dictionary where the filepath value will be stored.
+ * @param[in] in Input handler to examine (filepath is not available for all the input types).
+ * @param[out] filepath Address of the variable where the filepath is stored.
+ */
+void lys_parser_fill_filepath(struct ly_ctx *ctx, struct ly_in *in, const char **filepath);
+
+/**
+ * @brief Get the @ref ifftokens from the given position in the 2bits array
+ * (libyang format of the if-feature expression).
+ * @param[in] list The 2bits array with the compiled if-feature expression.
+ * @param[in] pos Position (0-based) to specify from which position get the operator.
+ */
+uint8_t lysc_iff_getop(uint8_t *list, size_t pos);
+
+/**
+ * @brief match yang keyword
+ *
+ * @param[in,out] in Input structure, is updated.
+ * @param[in,out] indent Pointer to the counter of current position on the line for YANG indentation (optional).
+ * @return yang_keyword values.
+ */
+enum ly_stmt lysp_match_kw(struct ly_in *in, uint64_t *indent);
+
+/**
+ * @brief Generate path of the given node in the requested format.
+ *
+ * @param[in] node Schema path of this node will be generated.
+ * @param[in] parent Build relative path only until this parent is found. If NULL, the full absolute path is printed.
+ * @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.
+ */
+char *lysc_path_until(const struct lysc_node *node, const struct lysc_node *parent, LYSC_PATH_TYPE pathtype, char *buffer,
+        size_t buflen);
+
+/**
+ * @brief Get format-specific prefix for a module.
+ *
+ * This function is available for type plugins via ::lyplg_type_get_prefix() API function.
+ *
+ * @param[in] mod Module whose prefix to get.
+ * @param[in] format Format of the prefix.
+ * @param[in] prefix_data Format-specific data based on @p format:
+ *      LY_VALUE_CANON           - NULL
+ *      LY_VALUE_SCHEMA          - const struct ::lysp_module* (module used for resolving imports to prefixes)
+ *      LY_VALUE_SCHEMA_RESOLVED - struct ::lysc_prefix* (sized array of pairs: prefix - module)
+ *      LY_VALUE_XML             - struct ::ly_set* (set of all returned modules as struct ::lys_module)
+ *      LY_VALUE_JSON            - NULL
+ *      LY_VALUE_LYB             - NULL
+ * @return Module prefix to print.
+ * @return NULL on error.
+ */
+const char *ly_get_prefix(const struct lys_module *mod, LY_VALUE_FORMAT format, void *prefix_data);
+
+/**
+ * @brief Resolve format-specific prefixes to modules.
+ *
+ * @param[in] ctx libyang context.
+ * @param[in] prefix Prefix to resolve.
+ * @param[in] prefix_len Length of @p prefix.
+ * @param[in] format Format of the prefix.
+ * @param[in] prefix_data Format-specific data based on @p format:
+ *      LY_VALUE_CANON           - NULL
+ *      LY_VALUE_SCHEMA          - const struct lysp_module * (module used for resolving prefixes from imports)
+ *      LY_VALUE_SCHEMA_RESOLVED - struct lyd_value_prefix * (sized array of pairs: prefix - module)
+ *      LY_VALUE_XML             - const struct ly_set * (set with defined namespaces stored as ::lyxml_ns)
+ *      LY_VALUE_JSON            - NULL
+ *      LY_VALUE_LYB             - NULL
+ * @return Resolved prefix module,
+ * @return NULL otherwise.
+ */
+const struct lys_module *ly_resolve_prefix(const struct ly_ctx *ctx, const void *prefix, size_t prefix_len,
+        LY_VALUE_FORMAT format, const void *prefix_data);
+
+/**
+ * @brief Learn whether @p PMOD needs to be recompiled if it is implemented.
+ *
+ * @param[in] PMOD Parsed module or submodule.
+ * @return Whether it has statements that are recompiled or not.
+ */
+#define LYSP_HAS_RECOMPILED(PMOD) \
+        (PMOD->data || PMOD->rpcs || PMOD->notifs || PMOD->exts)
+
+/**
+ * @brief Learn whether the module has statements that need to be recompiled or not.
+ *
+ * @param[in] mod Module to examine.
+ * @return Whether it has statements that are recompiled or not.
+ */
+ly_bool lys_has_recompiled(const struct lys_module *mod);
+
+/**
+ * @brief Learn whether @p PMOD needs to be compiled if it is implemented.
+ *
+ * @param[in] PMOD Parsed module or submodule.
+ * @return Whether it needs (has) a compiled module or not.
+ */
+#define LYSP_HAS_COMPILED(PMOD) \
+        (LYSP_HAS_RECOMPILED(PMOD) || PMOD->augments || PMOD->deviations)
+
+/**
+ * @brief Learn whether the module has statements that need to be compiled or not.
+ *
+ * @param[in] mod Module to examine.
+ * @return Whether it needs compiled module or not.
+ */
+ly_bool lys_has_compiled(const struct lys_module *mod);
+
+/**
+ * @brief Learn whether the module has any grouping statements or not.
+ *
+ * @param[in] mod Module to examine.
+ * @return Whether it has groupings or not.
+ */
+ly_bool lys_has_dep_mods(const struct lys_module *mod);
+
+/**
+ * @brief Get YANG string keyword of a statement.
+ *
+ * @return YANG string keyword of the statement.
+ */
+const char *lys_stmt_str(enum ly_stmt stmt);
+
+/**
+ * @brief Get YIN argument (attribute) name of a statement.
+ *
+ * @return YIN argument name, if any.
+ */
+const char *lys_stmt_arg(enum ly_stmt stmt);
+
+#define LY_STMT_FLAG_YIN 0x1 /**< has YIN element */
+#define LY_STMT_FLAG_ID 0x2  /**< the value is identifier -> no quotes */
+
+/**
+ * @brief Get statement printer flags.
+ *
+ * @return Additional statement information as LY_STMT_FLAG_* flags.
+ */
+uint8_t lys_stmt_flags(enum ly_stmt stmt);
+
+/**
+ * @brief Learn whether the module qualifies for a single dep set with only this module or not.
+ *
+ * @param[in] mod Module to examine.
+ * @return Whether it qualifies as a single dep set or not.
+ */
+#define LYS_IS_SINGLE_DEP_SET(mod) \
+        (!(mod)->parsed->features && (!lys_has_compiled(mod) || ((mod)->compiled && !lys_has_recompiled(mod))))
+
+/**
+ * @brief Get pointer to a 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[out] storage_p Pointer to a compiled ext instance substatement storage, NULL if was not compiled.
+ * @return LY_SUCCESS on success.
+ * @return LY_ENOT if the substatement is not supported.
+ */
+LY_ERR lyplg_ext_get_storage_p(const struct lysc_ext_instance *ext, int stmt, uint64_t *storage_p);
+
+/**
+ * @brief Warning if the filename does not match the expected module name and version
+ *
+ * @param[in] ctx Context for logging
+ * @param[in] name Expected module name
+ * @param[in] revision Expected module revision, or NULL if not to be checked
+ * @param[in] filename File path to be checked
+ */
+void ly_check_module_filename(const struct ly_ctx *ctx, const char *name, const char *revision, const char *filename);
+
+#endif /* LY_TREE_SCHEMA_INTERNAL_H_ */