src/parser_yang.c - github/CESNET/libyang - Gitiles

 /**
  * @file parser_yang.c
  * @author Michal Vasko <mvasko@cesnet.cz>
  * @brief YANG parser
  *
  * Copyright (c) 2018 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
  */
 #include "parser_internal.h"

 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

 #include "common.h"
 #include "context.h"
 #include "dict.h"
 #include "in_internal.h"
 #include "log.h"
 #include "parser_schema.h"
 #include "path.h"
 #include "set.h"
 #include "tree.h"
 #include "tree_edit.h"
 #include "tree_schema.h"
 #include "tree_schema_internal.h"

 struct lys_glob_unres;

 /**
  * @brief Insert WORD into the libyang context's dictionary and store as TARGET.
  * @param[in] CTX yang parser context to access libyang context.
  * @param[in] BUF buffer in case the word is not a constant and can be inserted directly (zero-copy)
  * @param[out] TARGET variable where to store the pointer to the inserted value.
  * @param[in] WORD string to store.
  * @param[in] LEN length of the string in WORD to store.
  */
 #define INSERT_WORD_RET(CTX, BUF, TARGET, WORD, LEN) \
     if (BUF) {LY_CHECK_RET(lydict_insert_zc(PARSER_CTX(CTX), WORD, &(TARGET)));}\
     else {LY_CHECK_RET(lydict_insert(PARSER_CTX(CTX), LEN ? WORD : "", LEN, &(TARGET)));}

 /**
  * @brief Read from the IN structure COUNT items. Also updates the indent value in yang parser context
  * @param[in] CTX yang parser context to update its indent value.
  * @param[in] COUNT number of items for which the DATA pointer is supposed to move on.
  */
 #define MOVE_INPUT(CTX, COUNT) ly_in_skip((CTX)->in, COUNT);(CTX)->indent+=COUNT

 /**
  * @brief Loop through all substatements.
  *
  * @param[in] CTX yang parser context for logging.
  * @param[out] KW YANG keyword read.
  * @param[out] WORD Pointer to the keyword itself.
  * @param[out] WORD_LEN Length of the keyword.
  * @param[out] ERR Variable for error storing.
  * @param[in] SUC_CMD Command is applied if a semicolon is found, so no
  * substatements are available. It is expected to contain a return or goto command.
  * @param[in] ERR_CMD Command is applied if an error occurs before loop through
  * substatements. It is expected to contain return or goto command.
  *
  * @return In case there are no substatements or a fatal error encountered.
  */
 #define YANG_READ_SUBSTMT_FOR(CTX, KW, WORD, WORD_LEN, ERR, SUC_CMD, ERR_CMD) \
     if ((ERR = get_keyword(CTX, &KW, &WORD, &WORD_LEN))) { \
         ERR_CMD; \
     } \
     if (KW == LY_STMT_SYNTAX_SEMICOLON) { \
         SUC_CMD; \
     } \
     if (KW != LY_STMT_SYNTAX_LEFT_BRACE) { \
         LOGVAL_PARSER(CTX, LYVE_SYNTAX_YANG, "Invalid keyword \"%s\", expected \";\" or \"{\".", ly_stmt2str(KW)); \
         ERR = LY_EVALID; \
         ERR_CMD; \
     } \
     for (ERR = get_keyword(CTX, &KW, &WORD, &WORD_LEN); \
             !ERR && (KW != LY_STMT_SYNTAX_RIGHT_BRACE); \
             ERR = get_keyword(CTX, &KW, &WORD, &WORD_LEN))

 LY_ERR parse_container(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent,
         struct lysp_node **siblings);
 LY_ERR parse_uses(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node **siblings);
 LY_ERR parse_choice(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node **siblings);
 LY_ERR parse_case(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node **siblings);
 LY_ERR parse_list(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node **siblings);
 LY_ERR parse_grouping(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node_grp **groupings);

 /**
  * @brief Add another character to dynamic buffer, a low-level function.
  *
  * Enlarge if needed. Updates \p input as well as \p buf_used.
  *
  * @param[in] ctx libyang context for logging.
  * @param[in,out] in Input structure.
  * @param[in] len Number of bytes to get from the input string and copy into the buffer.
  * @param[in,out] buf Buffer to use, can be moved by realloc().
  * @param[in,out] buf_len Current size of the buffer.
  * @param[in,out] buf_used Currently used characters of the buffer.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 buf_add_char(struct ly_ctx *ctx, struct ly_in *in, size_t len, char **buf, size_t *buf_len, size_t *buf_used)
 {
 #define BUF_STEP 16;
     if (*buf_len <= (*buf_used) + len) {
         *buf_len += BUF_STEP;
         *buf = ly_realloc(*buf, *buf_len);
         LY_CHECK_ERR_RET(!*buf, LOGMEM(ctx), LY_EMEM);
     }
     if (*buf_used) {
         ly_in_read(in, &(*buf)[*buf_used], len);
     } else {
         ly_in_read(in, *buf, len);
     }

     (*buf_used) += len;
     return LY_SUCCESS;
 #undef BUF_STEP
 }

 /**
  * @brief Store a single UTF8 character. It depends whether in a dynamically-allocated buffer or just as a pointer to the data.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] arg Type of the input string to select method of checking character validity.
  * @param[in,out] word_p Word pointer. If buffer (\p word_b) was not yet needed, it is just a pointer to the first
  * stored character. If buffer was needed (\p word_b is non-NULL or \p need_buf is set), it is pointing to the buffer.
  * @param[in,out] word_len Current length of the word pointed to by \p word_p.
  * @param[in,out] word_b Word buffer. Is kept NULL as long as it is not requested (word is a substring of the data).
  * @param[in,out] buf_len Current length of \p word_b.
  * @param[in] need_buf Flag if the dynamically allocated buffer is required.
  * @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
  *
  * @return LY_ERR values.
  */
 LY_ERR
 buf_store_char(struct lys_yang_parser_ctx *ctx, enum yang_arg arg, char **word_p, size_t *word_len,
         char **word_b, size_t *buf_len, ly_bool need_buf, uint8_t *prefix)
 {
     uint32_t c;
     size_t len;

     /* check  valid combination of input paremeters - if need_buf specified, word_b must be provided */
     assert(!need_buf || (need_buf && word_b));

     /* get UTF8 code point (and number of bytes coding the character) */
     LY_CHECK_ERR_RET(ly_getutf8(&ctx->in->current, &c, &len),
             LOGVAL_PARSER(ctx, LY_VCODE_INCHAR, ctx->in->current[-len]), LY_EVALID);
     ctx->in->current -= len;
     if (c == '\n') {
         ctx->indent = 0;
         LY_IN_NEW_LINE(ctx->in);
     } else {
         /* note - even the multibyte character is count as 1 */
         ++ctx->indent;
     }

     /* check character validity */
     switch (arg) {
     case Y_IDENTIF_ARG:
         LY_CHECK_RET(lysp_check_identifierchar((struct lys_parser_ctx *)ctx, c, !(*word_len), NULL));
         break;
     case Y_PREF_IDENTIF_ARG:
         LY_CHECK_RET(lysp_check_identifierchar((struct lys_parser_ctx *)ctx, c, !(*word_len), prefix));
         break;
     case Y_STR_ARG:
     case Y_MAYBE_STR_ARG:
         LY_CHECK_RET(lysp_check_stringchar((struct lys_parser_ctx *)ctx, c));
         break;
     }

     if (word_b && *word_b) {
         /* add another character into buffer */
         if (buf_add_char(PARSER_CTX(ctx), ctx->in, len, word_b, buf_len, word_len)) {
             return LY_EMEM;
         }

         /* in case of realloc */
         *word_p = *word_b;
     } else if (word_b && need_buf) {
         /* first time we need a buffer, copy everything read up to now */
         if (*word_len) {
             *word_b = malloc(*word_len);
             LY_CHECK_ERR_RET(!*word_b, LOGMEM(PARSER_CTX(ctx)), LY_EMEM);
             *buf_len = *word_len;
             memcpy(*word_b, *word_p, *word_len);
         }

         /* add this new character into buffer */
         if (buf_add_char(PARSER_CTX(ctx), ctx->in, len, word_b, buf_len, word_len)) {
             return LY_EMEM;
         }

         /* in case of realloc */
         *word_p = *word_b;
     } else {
         /* just remember the first character pointer */
         if (!*word_p) {
             *word_p = (char *)ctx->in->current;
         }
         /* ... and update the word's length */
         (*word_len) += len;
         ly_in_skip(ctx->in, len);
     }

     return LY_SUCCESS;
 }

 /**
  * @brief Skip YANG comment in data.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] comment Type of the comment to process:
  *                    1 for a one-line comment,
  *                    2 for a block comment.
  * @return LY_ERR values.
  */
 LY_ERR
 skip_comment(struct lys_yang_parser_ctx *ctx, uint8_t comment)
 {
     /* internal statuses: */
 #define COMMENT_NO        0 /* comment ended */
 #define COMMENT_LINE      1 /* in line comment */
 #define COMMENT_BLOCK     2 /* in block comment */
 #define COMMENT_BLOCK_END 3 /* in block comment with last read character '*' */

     while (ctx->in->current[0] && comment) {
         switch (comment) {
         case COMMENT_LINE:
             if (ctx->in->current[0] == '\n') {
                 comment = COMMENT_NO;
                 LY_IN_NEW_LINE(ctx->in);
             }
             break;
         case COMMENT_BLOCK:
             if (ctx->in->current[0] == '*') {
                 comment = COMMENT_BLOCK_END;
             } else if (ctx->in->current[0] == '\n') {
                 LY_IN_NEW_LINE(ctx->in);
             }
             break;
         case COMMENT_BLOCK_END:
             if (ctx->in->current[0] == '/') {
                 comment = COMMENT_NO;
             } else if (ctx->in->current[0] != '*') {
                 if (ctx->in->current[0] == '\n') {
                     LY_IN_NEW_LINE(ctx->in);
                 }
                 comment = COMMENT_BLOCK;
             }
             break;
         default:
             LOGINT_RET(PARSER_CTX(ctx));
         }

         if (ctx->in->current[0] == '\n') {
             ctx->indent = 0;
         } else {
             ++ctx->indent;
         }
         ++ctx->in->current;
     }

     if (!ctx->in->current[0] && (comment >= COMMENT_BLOCK)) {
         LOGVAL_PARSER(ctx, LYVE_SYNTAX, "Unexpected end-of-input, non-terminated comment.");
         return LY_EVALID;
     }

     return LY_SUCCESS;

 #undef COMMENT_NO
 #undef COMMENT_LINE
 #undef COMMENT_BLOCK
 #undef COMMENT_BLOCK_END
 }

 /**
  * @brief Read a quoted string from data.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] arg Type of YANG keyword argument expected.
  * @param[out] word_p Pointer to the read quoted string.
  * @param[out] word_b Pointer to a dynamically-allocated buffer holding the read quoted string. If not needed,
  * set to NULL. Otherwise equal to \p word_p.
  * @param[out] word_len Length of the read quoted string.
  * @param[out] buf_len Length of the dynamically-allocated buffer \p word_b.
  * @param[in] indent Current indent (number of YANG spaces). Needed for correct multi-line string
  * indenation in the final quoted string.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 read_qstring(struct lys_yang_parser_ctx *ctx, enum yang_arg arg, char **word_p, char **word_b,
         size_t *word_len, size_t *buf_len)
 {
     /* string parsing status: */
 #define STRING_ENDED 0 /* string ended */
 #define STRING_SINGLE_QUOTED 1 /* string with ' */
 #define STRING_DOUBLE_QUOTED 2 /* string with " */
 #define STRING_DOUBLE_QUOTED_ESCAPED 3 /* string with " with last character \ */
 #define STRING_PAUSED_NEXTSTRING     4 /* string finished, now skipping whitespaces looking for + */
 #define STRING_PAUSED_CONTINUE       5 /* string continues after +, skipping whitespaces */

     uint8_t string;
     uint64_t block_indent = 0, current_indent = 0;
     ly_bool need_buf = 0;
     uint8_t prefix = 0;
     const char *c;
     uint64_t trailing_ws = 0; /* current number of stored trailing whitespace characters */

     if (ctx->in->current[0] == '\"') {
         string = STRING_DOUBLE_QUOTED;
         current_indent = block_indent = ctx->indent + 1;
     } else {
         assert(ctx->in->current[0] == '\'');
         string = STRING_SINGLE_QUOTED;
     }
     MOVE_INPUT(ctx, 1);

     while (ctx->in->current[0] && string) {
         switch (string) {
         case STRING_SINGLE_QUOTED:
             switch (ctx->in->current[0]) {
             case '\'':
                 /* string may be finished, but check for + */
                 string = STRING_PAUSED_NEXTSTRING;
                 MOVE_INPUT(ctx, 1);
                 break;
             default:
                 /* check and store character */
                 LY_CHECK_RET(buf_store_char(ctx, arg, word_p, word_len, word_b, buf_len, need_buf, &prefix));
                 break;
             }
             break;
         case STRING_DOUBLE_QUOTED:
             switch (ctx->in->current[0]) {
             case '\"':
                 /* string may be finished, but check for + */
                 string = STRING_PAUSED_NEXTSTRING;
                 MOVE_INPUT(ctx, 1);
                 trailing_ws = 0;
                 break;
             case '\\':
                 /* special character following */
                 string = STRING_DOUBLE_QUOTED_ESCAPED;

                 /* the backslash sequence is substituted, so we will need a buffer to store the result */
                 need_buf = 1;

                 /* move forward to the escaped character */
                 ++ctx->in->current;

                 /* note that the trailing whitespaces are supposed to be trimmed before substitution of
                  * backslash-escaped characters (RFC 7950, 6.1.3), so we have to zero the trailing whitespaces counter */
                 trailing_ws = 0;

                 /* since the backslash-escaped character is handled as first non-whitespace character, stop eating indentation */
                 current_indent = block_indent;
                 break;
             case ' ':
                 if (current_indent < block_indent) {
                     ++current_indent;
                     MOVE_INPUT(ctx, 1);
                 } else {
                     /* check and store whitespace character */
                     LY_CHECK_RET(buf_store_char(ctx, arg, word_p, word_len, word_b, buf_len, need_buf, &prefix));
                     trailing_ws++;
                 }
                 break;
             case '\t':
                 if (current_indent < block_indent) {
                     assert(need_buf);
                     current_indent += Y_TAB_SPACES;
                     ctx->indent += Y_TAB_SPACES;
                     for ( ; current_indent > block_indent; --current_indent, --ctx->indent) {
                         /* store leftover spaces from the tab */
                         c = ctx->in->current;
                         ctx->in->current = " ";
                         LY_CHECK_RET(buf_store_char(ctx, arg, word_p, word_len, word_b, buf_len, need_buf, &prefix));
                         ctx->in->current = c;
                         trailing_ws++;
                     }
                     ++ctx->in->current;
                 } else {
                     /* check and store whitespace character */
                     LY_CHECK_RET(buf_store_char(ctx, arg, word_p, word_len, word_b, buf_len, need_buf, &prefix));
                     trailing_ws++;
                     /* additional characters for indentation - only 1 was count in buf_store_char */
                     ctx->indent += Y_TAB_SPACES - 1;
                 }
                 break;
             case '\r':
                 if (ctx->in->current[1] != '\n') {
                     LOGVAL_PARSER(ctx, LY_VCODE_INCHAR, ctx->in->current[0]);
                     return LY_EVALID;
                 }
             /* fallthrough */
             case '\n':
                 if (block_indent) {
                     /* we will be removing the indents so we need our own buffer */
                     need_buf = 1;

                     /* remove trailing tabs and spaces */
                     (*word_len) = *word_len - trailing_ws;

                     /* restart indentation */
                     current_indent = 0;
                 }

                 /* check and store character */
                 LY_CHECK_RET(buf_store_char(ctx, arg, word_p, word_len, word_b, buf_len, need_buf, &prefix));

                 /* reset context indentation counter for possible string after this one */
                 ctx->indent = 0;
                 trailing_ws = 0;
                 break;
             default:
                 /* first non-whitespace character, stop eating indentation */
                 current_indent = block_indent;

                 /* check and store character */
                 LY_CHECK_RET(buf_store_char(ctx, arg, word_p, word_len, word_b, buf_len, need_buf, &prefix));
                 trailing_ws = 0;
                 break;
             }
             break;
         case STRING_DOUBLE_QUOTED_ESCAPED:
             /* string encoded characters */
             c = ctx->in->current;
             switch (ctx->in->current[0]) {
             case 'n':
                 ctx->in->current = "\n";
                 /* fix false newline count in buf_store_char() */
                 ctx->in->line--;
                 break;
             case 't':
                 ctx->in->current = "\t";
                 break;
             case '\"':
             case '\\':
                 /* ok as is */
                 break;
             default:
                 LOGVAL_PARSER(ctx, LYVE_SYNTAX_YANG, "Double-quoted string unknown special character '\\%c'.",
                         ctx->in->current[0]);
                 return LY_EVALID;
             }

             /* check and store character */
             LY_CHECK_RET(buf_store_char(ctx, arg, word_p, word_len, word_b, buf_len, need_buf, &prefix));

             string = STRING_DOUBLE_QUOTED;
             ctx->in->current = c + 1;
             break;
         case STRING_PAUSED_NEXTSTRING:
             switch (ctx->in->current[0]) {
             case '+':
                 /* string continues */
                 string = STRING_PAUSED_CONTINUE;
                 need_buf = 1;
                 break;
             case '\r':
                 if (ctx->in->current[1] != '\n') {
                     LOGVAL_PARSER(ctx, LY_VCODE_INCHAR, ctx->in->current[0]);
                     return LY_EVALID;
                 }
                 MOVE_INPUT(ctx, 1);
             /* fallthrough */
             case '\n':
                 LY_IN_NEW_LINE(ctx->in);
             /* fall through */
             case ' ':
             case '\t':
                 /* just skip */
                 break;
             default:
                 /* string is finished */
                 goto string_end;
             }
             MOVE_INPUT(ctx, 1);
             break;
         case STRING_PAUSED_CONTINUE:
             switch (ctx->in->current[0]) {
             case '\r':
                 if (ctx->in->current[1] != '\n') {
                     LOGVAL_PARSER(ctx, LY_VCODE_INCHAR, ctx->in->current[0]);
                     return LY_EVALID;
                 }
                 MOVE_INPUT(ctx, 1);
             /* fallthrough */
             case '\n':
                 LY_IN_NEW_LINE(ctx->in);
             /* fall through */
             case ' ':
             case '\t':
                 /* skip */
                 break;
             case '\'':
                 string = STRING_SINGLE_QUOTED;
                 break;
             case '\"':
                 string = STRING_DOUBLE_QUOTED;
                 break;
             default:
                 /* it must be quoted again */
                 LOGVAL_PARSER(ctx, LYVE_SYNTAX_YANG, "Both string parts divided by '+' must be quoted.");
                 return LY_EVALID;
             }
             MOVE_INPUT(ctx, 1);
             break;
         default:
             return LY_EINT;
         }
     }

 string_end:
     if ((arg <= Y_PREF_IDENTIF_ARG) && !(*word_len)) {
         /* empty identifier */
         LOGVAL_PARSER(ctx, LYVE_SYNTAX_YANG, "Statement argument is required.");
         return LY_EVALID;
     }
     return LY_SUCCESS;

 #undef STRING_ENDED
 #undef STRING_SINGLE_QUOTED
 #undef STRING_DOUBLE_QUOTED
 #undef STRING_DOUBLE_QUOTED_ESCAPED
 #undef STRING_PAUSED_NEXTSTRING
 #undef STRING_PAUSED_CONTINUE
 }

 /**
  * @brief Get another YANG string from the raw data.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] arg Type of YANG keyword argument expected.
  * @param[out] flags optional output argument to get flag of the argument's quoting (LYS_*QUOTED - see
  * [schema node flags](@ref snodeflags))
  * @param[out] word_p Pointer to the read string. Can return NULL if \p arg is #Y_MAYBE_STR_ARG.
  * @param[out] word_b Pointer to a dynamically-allocated buffer holding the read string. If not needed,
  * set to NULL. Otherwise equal to \p word_p.
  * @param[out] word_len Length of the read string.
  * @return LY_ERR values.
  */
 LY_ERR
 get_argument(struct lys_yang_parser_ctx *ctx, enum yang_arg arg, uint16_t *flags, char **word_p,
         char **word_b, size_t *word_len)
 {
     LY_ERR ret;
     size_t buf_len = 0;
     uint8_t prefix = 0;

     /* word buffer - dynamically allocated */
     *word_b = NULL;

     /* word pointer - just a pointer to data */
     *word_p = NULL;

     *word_len = 0;
     while (ctx->in->current[0]) {
         switch (ctx->in->current[0]) {
         case '\'':
         case '\"':
             if (*word_len) {
                 /* invalid - quotes cannot be in unquoted string and only optsep, ; or { can follow it */
                 LOGVAL_PARSER(ctx, LY_VCODE_INSTREXP, 1, ctx->in->current,
                         "unquoted string character, optsep, semicolon or opening brace");
                 ret = LY_EVALID;
                 goto error;
             }
             if (flags) {
                 (*flags) |= ctx->in->current[0] == '\'' ? LYS_SINGLEQUOTED : LYS_DOUBLEQUOTED;
             }
             LY_CHECK_GOTO(ret = read_qstring(ctx, arg, word_p, word_b, word_len, &buf_len), error);
             goto str_end;
         case '/':
             if (ctx->in->current[1] == '/') {
                 /* one-line comment */
                 MOVE_INPUT(ctx, 2);
                 LY_CHECK_GOTO(ret = skip_comment(ctx, 1), error);
             } else if (ctx->in->current[1] == '*') {
                 /* block comment */
                 MOVE_INPUT(ctx, 2);
                 LY_CHECK_GOTO(ret = skip_comment(ctx, 2), error);
             } else {
                 /* not a comment after all */
                 LY_CHECK_GOTO(ret = buf_store_char(ctx, arg, word_p, word_len, word_b, &buf_len, 0, &prefix), error);
             }
             break;
         case ' ':
             if (*word_len) {
                 /* word is finished */
                 goto str_end;
             }
             MOVE_INPUT(ctx, 1);
             break;
         case '\t':
             if (*word_len) {
                 /* word is finished */
                 goto str_end;
             }
             /* tabs count for 8 spaces */
             ctx->indent += Y_TAB_SPACES;

             ++ctx->in->current;
             break;
         case '\r':
             if (ctx->in->current[1] != '\n') {
                 LOGVAL_PARSER(ctx, LY_VCODE_INCHAR, ctx->in->current[0]);
                 ret = LY_EVALID;
                 goto error;
             }
             MOVE_INPUT(ctx, 1);
         /* fallthrough */
         case '\n':
             if (*word_len) {
                 /* word is finished */
                 goto str_end;
             }
             LY_IN_NEW_LINE(ctx->in);
             MOVE_INPUT(ctx, 1);

             /* reset indent */
             ctx->indent = 0;
             break;
         case ';':
         case '{':
             if (*word_len || (arg == Y_MAYBE_STR_ARG)) {
                 /* word is finished */
                 goto str_end;
             }

             LOGVAL_PARSER(ctx, LY_VCODE_INSTREXP, 1, ctx->in->current, "an argument");
             ret = LY_EVALID;
             goto error;
         case '}':
             /* invalid - braces cannot be in unquoted string (opening braces terminates the string and can follow it) */
             LOGVAL_PARSER(ctx, LY_VCODE_INSTREXP, 1, ctx->in->current,
                     "unquoted string character, optsep, semicolon or opening brace");
             ret = LY_EVALID;
             goto error;
         default:
             LY_CHECK_GOTO(ret = buf_store_char(ctx, arg, word_p, word_len, word_b, &buf_len, 0, &prefix), error);
             break;
         }
     }

     /* unexpected end of loop */
     LOGVAL_PARSER(ctx, LY_VCODE_EOF);
     ret = LY_EVALID;
     goto error;

 str_end:
     /* terminating NULL byte for buf */
     if (*word_b) {
         (*word_b) = ly_realloc(*word_b, (*word_len) + 1);
         LY_CHECK_ERR_RET(!(*word_b), LOGMEM(PARSER_CTX(ctx)), LY_EMEM);
         (*word_b)[*word_len] = '\0';
         *word_p = *word_b;
     }

     return LY_SUCCESS;

 error:
     free(*word_b);
     *word_b = NULL;
     return ret;
 }

 /**
  * @brief Get another YANG keyword from the raw data.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[out] kw YANG keyword read.
  * @param[out] word_p Pointer to the keyword in the data. Useful for extension instances.
  * @param[out] word_len Length of the keyword in the data. Useful for extension instances.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 get_keyword(struct lys_yang_parser_ctx *ctx, enum ly_stmt *kw, char **word_p, size_t *word_len)
 {
     uint8_t prefix;
     const char *word_start;
     size_t len;

     if (word_p) {
         *word_p = NULL;
         *word_len = 0;
     }

     /* first skip "optsep", comments */
     while (ctx->in->current[0]) {
         switch (ctx->in->current[0]) {
         case '/':
             if (ctx->in->current[1] == '/') {
                 /* one-line comment */
                 MOVE_INPUT(ctx, 2);
                 LY_CHECK_RET(skip_comment(ctx, 1));
             } else if (ctx->in->current[1] == '*') {
                 /* block comment */
                 MOVE_INPUT(ctx, 2);
                 LY_CHECK_RET(skip_comment(ctx, 2));
             } else {
                 /* error - not a comment after all, keyword cannot start with slash */
                 LOGVAL_PARSER(ctx, LYVE_SYNTAX_YANG, "Invalid identifier first character '/'.");
                 return LY_EVALID;
             }
             continue;
         case '\n':
             /* skip whitespaces (optsep) */
             LY_IN_NEW_LINE(ctx->in);
             ctx->indent = 0;
             break;
         case ' ':
             /* skip whitespaces (optsep) */
             ++ctx->indent;
             break;
         case '\t':
             /* skip whitespaces (optsep) */
             ctx->indent += Y_TAB_SPACES;
             break;
         case '\r':
             /* possible CRLF endline */
             if (ctx->in->current[1] == '\n') {
                 break;
             }
         /* fallthrough */
         default:
             /* either a keyword start or an invalid character */
             goto keyword_start;
         }

         ly_in_skip(ctx->in, 1);
     }

 keyword_start:
     word_start = ctx->in->current;
     *kw = lysp_match_kw(ctx->in, &ctx->indent);

     if (*kw == LY_STMT_SYNTAX_SEMICOLON) {
         goto success;
     } else if (*kw == LY_STMT_SYNTAX_LEFT_BRACE) {
         ctx->depth++;
         if (ctx->depth > LY_MAX_BLOCK_DEPTH) {
             LOGERR(ctx->parsed_mod->mod->ctx, LY_EINVAL,
                     "The maximum number of block nestings has been exceeded.");
             return LY_EINVAL;
         }
         goto success;
     } else if (*kw == LY_STMT_SYNTAX_RIGHT_BRACE) {
         ctx->depth--;
         goto success;
     }

     if (*kw != LY_STMT_NONE) {
         /* make sure we have the whole keyword */
         switch (ctx->in->current[0]) {
         case '\r':
             if (ctx->in->current[1] != '\n') {
                 LOGVAL_PARSER(ctx, LY_VCODE_INCHAR, ctx->in->current[0]);
                 return LY_EVALID;
             }
             MOVE_INPUT(ctx, 1);
         /* fallthrough */
         case '\n':
         case '\t':
         case ' ':
             /* mandatory "sep" is just checked, not eaten so nothing in the context is updated */
             break;
         case ':':
             /* keyword is not actually a keyword, but prefix of an extension.
              * To avoid repeated check of the prefix syntax, move to the point where the colon was read
              * and we will be checking the keyword (extension instance) itself */
             prefix = 1;
             MOVE_INPUT(ctx, 1);
             goto extension;
         case '{':
             /* allowed only for input and output statements which can be without arguments */
             if ((*kw == LY_STMT_INPUT) || (*kw == LY_STMT_OUTPUT)) {
                 break;
             }
         /* fall through */
         default:
             MOVE_INPUT(ctx, 1);
             LOGVAL_PARSER(ctx, LY_VCODE_INSTREXP, (int)(ctx->in->current - word_start), word_start,
                     "a keyword followed by a separator");
             return LY_EVALID;
         }
     } else {
         /* still can be an extension */
         prefix = 0;

 extension:
         while (ctx->in->current[0] && (ctx->in->current[0] != ' ') && (ctx->in->current[0] != '\t') &&
                 (ctx->in->current[0] != '\n') && (ctx->in->current[0] != '\r') && (ctx->in->current[0] != '{') &&
                 (ctx->in->current[0] != ';')) {
             uint32_t c = 0;

             LY_CHECK_ERR_RET(ly_getutf8(&ctx->in->current, &c, &len),
                     LOGVAL_PARSER(ctx, LY_VCODE_INCHAR, ctx->in->current[-len]), LY_EVALID);
             ++ctx->indent;
             /* check character validity */
             LY_CHECK_RET(lysp_check_identifierchar((struct lys_parser_ctx *)ctx, c,
                     ctx->in->current - len == word_start ? 1 : 0, &prefix));
         }
         if (!ctx->in->current[0]) {
             LOGVAL_PARSER(ctx, LY_VCODE_EOF);
             return LY_EVALID;
         }

         /* prefix is mandatory for extension instances */
         if (prefix != 2) {
             LOGVAL_PARSER(ctx, LY_VCODE_INSTREXP, (int)(ctx->in->current - word_start), word_start, "a keyword");
             return LY_EVALID;
         }

         *kw = LY_STMT_EXTENSION_INSTANCE;
     }

 success:
     if (word_p) {
         *word_p = (char *)word_start;
         *word_len = ctx->in->current - word_start;
     }

     return LY_SUCCESS;
 }

 /**
  * @brief Parse extension instance substatements.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] kw Statement keyword value matching @p word value.
  * @param[in] word Extension instance substatement name (keyword).
  * @param[in] word_len Extension instance substatement name length.
  * @param[in,out] child Children of this extension instance to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_ext_substmt(struct lys_yang_parser_ctx *ctx, enum ly_stmt kw, char *word, size_t word_len,
         struct lysp_stmt **child)
 {
     char *buf;
     LY_ERR ret = LY_SUCCESS;
     enum ly_stmt child_kw;
     struct lysp_stmt *stmt, *par_child;

     stmt = calloc(1, sizeof *stmt);
     LY_CHECK_ERR_RET(!stmt, LOGMEM(NULL), LY_EMEM);

     /* insert into parent statements */
     if (!*child) {
         *child = stmt;
     } else {
         for (par_child = *child; par_child->next; par_child = par_child->next) {}
         par_child->next = stmt;
     }

     /* statement */
     LY_CHECK_RET(lydict_insert(PARSER_CTX(ctx), word, word_len, &stmt->stmt));

     /* get optional argument */
     LY_CHECK_RET(get_argument(ctx, Y_MAYBE_STR_ARG, &stmt->flags, &word, &buf, &word_len));
     if (word) {
         INSERT_WORD_RET(ctx, buf, stmt->arg, word, word_len);
     }

     stmt->format = LY_VALUE_SCHEMA;
     stmt->prefix_data = ctx->parsed_mod;
     stmt->kw = kw;

     YANG_READ_SUBSTMT_FOR(ctx, child_kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         LY_CHECK_RET(parse_ext_substmt(ctx, child_kw, word, word_len, &stmt->child));
     }
     return ret;
 }

 /**
  * @brief Parse extension instance.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] ext_name Extension instance substatement name (keyword).
  * @param[in] ext_name_len Extension instance substatement name length.
  * @param[in] insubstmt The statement this extension instance is a substatement of.
  * @param[in] insubstmt_index Index of the keyword instance this extension instance is a substatement of.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_ext(struct lys_yang_parser_ctx *ctx, const char *ext_name, size_t ext_name_len, enum ly_stmt insubstmt,
         LY_ARRAY_COUNT_TYPE insubstmt_index, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     struct lysp_ext_instance *e;
     enum ly_stmt kw;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *exts, e, LY_EMEM);

     if (!ly_strnchr(ext_name, ':', ext_name_len)) {
         LOGVAL_PARSER(ctx, LYVE_SYNTAX, "Extension instance \"%*.s\" without the mandatory prefix.", ext_name_len, ext_name);
         return LY_EVALID;
     }

     /* store name */
     LY_CHECK_RET(lydict_insert(PARSER_CTX(ctx), ext_name, ext_name_len, &e->name));

     /* get optional argument */
     LY_CHECK_RET(get_argument(ctx, Y_MAYBE_STR_ARG, NULL, &word, &buf, &word_len));
     if (word) {
         INSERT_WORD_RET(ctx, buf, e->argument, word, word_len);
     }

     /* store the rest of information */
     e->format = LY_VALUE_SCHEMA;
     e->parsed = NULL;
     e->prefix_data = ctx->parsed_mod;
     e->parent_stmt = insubstmt;
     e->parent_stmt_index = insubstmt_index;

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         LY_CHECK_RET(parse_ext_substmt(ctx, kw, word, word_len, &e->child));
     }
     return ret;
 }

 /**
  * @brief Parse a generic text field without specific constraints. Those are contact, organization,
  * description, etc...
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] substmt Type of this substatement.
  * @param[in] substmt_index Index of this substatement.
  * @param[in,out] value Place to store the parsed value.
  * @param[in] arg Type of the YANG keyword argument (of the value).
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_text_field(struct lys_yang_parser_ctx *ctx, enum ly_stmt substmt, uint32_t substmt_index,
         const char **value, enum yang_arg arg, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     if (*value) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, ly_stmt2str(substmt));
         return LY_EVALID;
     }

     /* get value */
     LY_CHECK_RET(get_argument(ctx, arg, NULL, &word, &buf, &word_len));

     /* store value and spend buf if allocated */
     INSERT_WORD_RET(ctx, buf, *value, word, word_len);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, substmt, substmt_index, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), ly_stmt2str(substmt));
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the yang-version statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[out] version Storage for the parsed information.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_yangversion(struct lys_yang_parser_ctx *ctx, uint8_t *version, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     if (*version) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "yang-version");
         return LY_EVALID;
     }

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if ((word_len == 1) && !strncmp(word, "1", word_len)) {
         *version = LYS_VERSION_1_0;
     } else if ((word_len == ly_strlen_const("1.1")) && !strncmp(word, "1.1", word_len)) {
         *version = LYS_VERSION_1_1;
     } else {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "yang-version");
         free(buf);
         return LY_EVALID;
     }
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_YANG_VERSION, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "yang-version");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the belongs-to statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] prefix Place to store the parsed belongs-to prefix value.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_belongsto(struct lys_yang_parser_ctx *ctx, const char **prefix, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     if (*prefix) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "belongs-to");
         return LY_EVALID;
     }

     /* get value, it must match the main module */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     if (ly_strncmp(ctx->parsed_mod->mod->name, word, word_len)) {
         LOGVAL_PARSER(ctx, LYVE_SYNTAX_YANG, "Submodule \"belongs-to\" value \"%.*s\" does not match its module name \"%s\".",
                 (int)word_len, word, ctx->parsed_mod->mod->name);
         free(buf);
         return LY_EVALID;
     }
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, goto checks, return ret) {
         switch (kw) {
         case LY_STMT_PREFIX:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_PREFIX, 0, prefix, Y_IDENTIF_ARG, exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_BELONGS_TO, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "belongs-to");
             return LY_EVALID;
         }
     }
     LY_CHECK_RET(ret);
 checks:
     /* mandatory substatements */
     if (!*prefix) {
         LOGVAL_PARSER(ctx, LY_VCODE_MISSTMT, "prefix", "belongs-to");
         return LY_EVALID;
     }
     return ret;
 }

 /**
  * @brief Parse the revision-date statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] rev Array to store the parsed value in.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_revisiondate(struct lys_yang_parser_ctx *ctx, char *rev, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     if (rev[0]) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "revision-date");
         return LY_EVALID;
     }

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     /* check value */
     if (lysp_check_date((struct lys_parser_ctx *)ctx, word, word_len, "revision-date")) {
         free(buf);
         return LY_EVALID;
     }

     /* store value and spend buf if allocated */
     strncpy(rev, word, word_len);
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_REVISION_DATE, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "revision-date");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the include statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] module_name Name of the module to check name collisions.
  * @param[in,out] includes Parsed includes to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_include(struct lys_yang_parser_ctx *ctx, const char *module_name, struct lysp_include **includes)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_include *inc;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *includes, inc, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));

     INSERT_WORD_RET(ctx, buf, inc->name, word, word_len);

     /* submodules share the namespace with the module names, so there must not be
      * a module of the same name in the context, no need for revision matching */
     if (!strcmp(module_name, inc->name) || ly_ctx_get_module_latest(PARSER_CTX(ctx), inc->name)) {
         LOGVAL_PARSER(ctx, LY_VCODE_NAME2_COL, "module", "submodule", inc->name);
         return LY_EVALID;
     }

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             PARSER_CHECK_STMTVER2_RET(ctx, "description", "include");
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &inc->dsc, Y_STR_ARG, &inc->exts));
             break;
         case LY_STMT_REFERENCE:
             PARSER_CHECK_STMTVER2_RET(ctx, "reference", "include");
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &inc->ref, Y_STR_ARG, &inc->exts));
             break;
         case LY_STMT_REVISION_DATE:
             LY_CHECK_RET(parse_revisiondate(ctx, inc->rev, &inc->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_INCLUDE, 0, &inc->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "include");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the import statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] module_prefix Prefix of the module to check prefix collisions.
  * @param[in,out] imports Parsed imports to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_import(struct lys_yang_parser_ctx *ctx, const char *module_prefix, struct lysp_import **imports)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_import *imp;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *imports, imp, LY_EVALID);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, imp->name, word, word_len);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, goto checks, return ret) {
         switch (kw) {
         case LY_STMT_PREFIX:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_PREFIX, 0, &imp->prefix, Y_IDENTIF_ARG, &imp->exts));
             LY_CHECK_RET(lysp_check_prefix((struct lys_parser_ctx *)ctx, *imports, module_prefix, &imp->prefix), LY_EVALID);
             break;
         case LY_STMT_DESCRIPTION:
             PARSER_CHECK_STMTVER2_RET(ctx, "description", "import");
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &imp->dsc, Y_STR_ARG, &imp->exts));
             break;
         case LY_STMT_REFERENCE:
             PARSER_CHECK_STMTVER2_RET(ctx, "reference", "import");
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &imp->ref, Y_STR_ARG, &imp->exts));
             break;
         case LY_STMT_REVISION_DATE:
             LY_CHECK_RET(parse_revisiondate(ctx, imp->rev, &imp->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_IMPORT, 0, &imp->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "import");
             return LY_EVALID;
         }
     }
     LY_CHECK_RET(ret);
 checks:
     /* mandatory substatements */
     LY_CHECK_ERR_RET(!imp->prefix, LOGVAL_PARSER(ctx, LY_VCODE_MISSTMT, "prefix", "import"), LY_EVALID);

     return ret;
 }

 /**
  * @brief Parse the revision statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] revs Parsed revisions to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_revision(struct lys_yang_parser_ctx *ctx, struct lysp_revision **revs)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_revision *rev;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *revs, rev, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     /* check value */
     if (lysp_check_date((struct lys_parser_ctx *)ctx, word, word_len, "revision")) {
         free(buf);
         return LY_EVALID;
     }

     strncpy(rev->date, word, word_len);
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &rev->dsc, Y_STR_ARG, &rev->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &rev->ref, Y_STR_ARG, &rev->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_REVISION, 0, &rev->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "revision");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse a generic text field that can have more instances such as base.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] substmt Type of this substatement.
  * @param[in,out] texts Parsed values to add to.
  * @param[in] arg Type of the expected argument.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_text_fields(struct lys_yang_parser_ctx *ctx, enum ly_stmt substmt, const char ***texts, enum yang_arg arg,
         struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     const char **item;
     size_t word_len;
     enum ly_stmt kw;

     /* allocate new pointer */
     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *texts, item, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, arg, NULL, &word, &buf, &word_len));

     INSERT_WORD_RET(ctx, buf, *item, word, word_len);
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, substmt, LY_ARRAY_COUNT(*texts) - 1, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), ly_stmt2str(substmt));
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse a generic text field that can have more instances such as base.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] substmt Type of this substatement.
  * @param[in,out] qnames Parsed qnames to add to.
  * @param[in] arg Type of the expected argument.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_qnames(struct lys_yang_parser_ctx *ctx, enum ly_stmt substmt, struct lysp_qname **qnames,
         enum yang_arg arg, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     struct lysp_qname *item;
     size_t word_len;
     enum ly_stmt kw;

     /* allocate new pointer */
     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *qnames, item, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, arg, NULL, &word, &buf, &word_len));

     INSERT_WORD_RET(ctx, buf, item->str, word, word_len);
     item->mod = ctx->parsed_mod;
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, substmt, LY_ARRAY_COUNT(*qnames) - 1, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), ly_stmt2str(substmt));
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the config statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] flags Flags to add to.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_config(struct lys_yang_parser_ctx *ctx, uint16_t *flags, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     if (*flags & LYS_CONFIG_MASK) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "config");
         return LY_EVALID;
     }

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if ((word_len == ly_strlen_const("true")) && !strncmp(word, "true", word_len)) {
         *flags |= LYS_CONFIG_W;
     } else if ((word_len == ly_strlen_const("false")) && !strncmp(word, "false", word_len)) {
         *flags |= LYS_CONFIG_R;
     } else {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "config");
         free(buf);
         return LY_EVALID;
     }
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_CONFIG, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "config");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the mandatory statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] flags Flags to add to.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_mandatory(struct lys_yang_parser_ctx *ctx, uint16_t *flags, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     if (*flags & LYS_MAND_MASK) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "mandatory");
         return LY_EVALID;
     }

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if ((word_len == ly_strlen_const("true")) && !strncmp(word, "true", word_len)) {
         *flags |= LYS_MAND_TRUE;
     } else if ((word_len == ly_strlen_const("false")) && !strncmp(word, "false", word_len)) {
         *flags |= LYS_MAND_FALSE;
     } else {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "mandatory");
         free(buf);
         return LY_EVALID;
     }
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_MANDATORY, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "mandatory");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse a restriction such as range or length.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] restr_kw Type of this particular restriction.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_restr(struct lys_yang_parser_ctx *ctx, enum ly_stmt restr_kw, struct lysp_restr *restr)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     CHECK_NONEMPTY(ctx, word_len, ly_stmt2str(restr_kw));
     INSERT_WORD_RET(ctx, buf, restr->arg.str, word, word_len);
     restr->arg.mod = ctx->parsed_mod;
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &restr->dsc, Y_STR_ARG, &restr->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &restr->ref, Y_STR_ARG, &restr->exts));
             break;
         case LY_STMT_ERROR_APP_TAG:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_ERROR_APP_TAG, 0, &restr->eapptag, Y_STR_ARG, &restr->exts));
             break;
         case LY_STMT_ERROR_MESSAGE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_ERROR_MESSAGE, 0, &restr->emsg, Y_STR_ARG, &restr->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, restr_kw, 0, &restr->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), ly_stmt2str(restr_kw));
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse a restriction that can have more instances such as must.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] restr_kw Type of this particular restriction.
  * @param[in,out] restrs Restrictions to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_restrs(struct lys_yang_parser_ctx *ctx, enum ly_stmt restr_kw, struct lysp_restr **restrs)
 {
     struct lysp_restr *restr;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *restrs, restr, LY_EMEM);
     return parse_restr(ctx, restr_kw, restr);
 }

 /**
  * @brief Parse the status statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] flags Flags to add to.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_status(struct lys_yang_parser_ctx *ctx, uint16_t *flags, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     if (*flags & LYS_STATUS_MASK) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "status");
         return LY_EVALID;
     }

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if ((word_len == ly_strlen_const("current")) && !strncmp(word, "current", word_len)) {
         *flags |= LYS_STATUS_CURR;
     } else if ((word_len == ly_strlen_const("deprecated")) && !strncmp(word, "deprecated", word_len)) {
         *flags |= LYS_STATUS_DEPRC;
     } else if ((word_len == ly_strlen_const("obsolete")) && !strncmp(word, "obsolete", word_len)) {
         *flags |= LYS_STATUS_OBSLT;
     } else {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "status");
         free(buf);
         return LY_EVALID;
     }
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_STATUS, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "status");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the when statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] when_p When pointer to parse to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_when(struct lys_yang_parser_ctx *ctx, struct lysp_when **when_p)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_when *when;

     if (*when_p) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "when");
         return LY_EVALID;
     }

     when = calloc(1, sizeof *when);
     LY_CHECK_ERR_RET(!when, LOGMEM(PARSER_CTX(ctx)), LY_EMEM);
     *when_p = when;

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));
     CHECK_NONEMPTY(ctx, word_len, "when");
     INSERT_WORD_RET(ctx, buf, when->cond, word, word_len);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &when->dsc, Y_STR_ARG, &when->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &when->ref, Y_STR_ARG, &when->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_WHEN, 0, &when->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "when");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the anydata or anyxml statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] any_kw Type of this particular keyword.
  * @param[in,out] siblings Siblings to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_any(struct lys_yang_parser_ctx *ctx, enum ly_stmt any_kw, struct lysp_node *parent, struct lysp_node **siblings)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     struct lysp_node_anydata *any;
     enum ly_stmt kw;

     /* create new structure and insert into siblings */
     LY_LIST_NEW_RET(PARSER_CTX(ctx), siblings, any, next, LY_EMEM);

     any->nodetype = any_kw == LY_STMT_ANYDATA ? LYS_ANYDATA : LYS_ANYXML;
     any->parent = parent;

     /* get name */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, any->name, word, word_len);

     /* parse substatements */
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_CONFIG:
             LY_CHECK_RET(parse_config(ctx, &any->flags, &any->exts));
             break;
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &any->dsc, Y_STR_ARG, &any->exts));
             break;
         case LY_STMT_IF_FEATURE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &any->iffeatures, Y_STR_ARG, &any->exts));
             break;
         case LY_STMT_MANDATORY:
             LY_CHECK_RET(parse_mandatory(ctx, &any->flags, &any->exts));
             break;
         case LY_STMT_MUST:
             LY_CHECK_RET(parse_restrs(ctx, kw, &any->musts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &any->ref, Y_STR_ARG, &any->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &any->flags, &any->exts));
             break;
         case LY_STMT_WHEN:
             LY_CHECK_RET(parse_when(ctx, &any->when));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, any_kw, 0, &any->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), ly_stmt2str(any_kw));
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the value or position statement. Substatement of type enum statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] val_kw Type of this particular keyword.
  * @param[in,out] value Value to write to.
  * @param[in,out] flags Flags to write to.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_type_enum_value_pos(struct lys_yang_parser_ctx *ctx, enum ly_stmt val_kw, int64_t *value, uint16_t *flags,
         struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word, *ptr;
     size_t word_len;
     long int num = 0;
     unsigned long int unum = 0;
     enum ly_stmt kw;

     if (*flags & LYS_SET_VALUE) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, ly_stmt2str(val_kw));
         return LY_EVALID;
     }
     *flags |= LYS_SET_VALUE;

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if (!word_len || (word[0] == '+') || ((word[0] == '0') && (word_len > 1)) || ((val_kw == LY_STMT_POSITION) && !strncmp(word, "-0", 2))) {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, ly_stmt2str(val_kw));
         goto error;
     }

     errno = 0;
     if (val_kw == LY_STMT_VALUE) {
         num = strtol(word, &ptr, LY_BASE_DEC);
         if ((num < INT64_C(-2147483648)) || (num > INT64_C(2147483647))) {
             LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, ly_stmt2str(val_kw));
             goto error;
         }
     } else {
         unum = strtoul(word, &ptr, LY_BASE_DEC);
         if (unum > UINT64_C(4294967295)) {
             LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, ly_stmt2str(val_kw));
             goto error;
         }
     }
     /* we have not parsed the whole argument */
     if ((size_t)(ptr - word) != word_len) {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, ly_stmt2str(val_kw));
         goto error;
     }
     if (errno == ERANGE) {
         LOGVAL_PARSER(ctx, LY_VCODE_OOB, word_len, word, ly_stmt2str(val_kw));
         goto error;
     }
     if (val_kw == LY_STMT_VALUE) {
         *value = num;
     } else {
         *value = unum;
     }
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, val_kw == LY_STMT_VALUE ? LY_STMT_VALUE : LY_STMT_POSITION, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), ly_stmt2str(val_kw));
             return LY_EVALID;
         }
     }
     return ret;

 error:
     free(buf);
     return LY_EVALID;
 }

 /**
  * @brief Parse the enum or bit statement. Substatement of type statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] enum_kw Type of this particular keyword.
  * @param[in,out] enums Enums or bits to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_type_enum(struct lys_yang_parser_ctx *ctx, enum ly_stmt enum_kw, struct lysp_type_enum **enums)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_type_enum *enm;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *enums, enm, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, enum_kw == LY_STMT_ENUM ? Y_STR_ARG : Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     if (enum_kw == LY_STMT_ENUM) {
         ret = lysp_check_enum_name((struct lys_parser_ctx *)ctx, (const char *)word, word_len);
         LY_CHECK_ERR_RET(ret, free(buf), ret);
     } /* else nothing specific for YANG_BIT */

     INSERT_WORD_RET(ctx, buf, enm->name, word, word_len);
     CHECK_UNIQUENESS(ctx, *enums, name, ly_stmt2str(enum_kw), enm->name);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &enm->dsc, Y_STR_ARG, &enm->exts));
             break;
         case LY_STMT_IF_FEATURE:
             PARSER_CHECK_STMTVER2_RET(ctx, "if-feature", ly_stmt2str(enum_kw));
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &enm->iffeatures, Y_STR_ARG, &enm->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &enm->ref, Y_STR_ARG, &enm->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &enm->flags, &enm->exts));
             break;
         case LY_STMT_VALUE:
             LY_CHECK_ERR_RET(enum_kw == LY_STMT_BIT, LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw),
                     ly_stmt2str(enum_kw)), LY_EVALID);
             LY_CHECK_RET(parse_type_enum_value_pos(ctx, kw, &enm->value, &enm->flags, &enm->exts));
             break;
         case LY_STMT_POSITION:
             LY_CHECK_ERR_RET(enum_kw == LY_STMT_ENUM, LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw),
                     ly_stmt2str(enum_kw)), LY_EVALID);
             LY_CHECK_RET(parse_type_enum_value_pos(ctx, kw, &enm->value, &enm->flags, &enm->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, enum_kw, 0, &enm->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), ly_stmt2str(enum_kw));
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the fraction-digits statement. Substatement of type statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] fracdig Value to write to.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_type_fracdigits(struct lys_yang_parser_ctx *ctx, uint8_t *fracdig, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word, *ptr;
     size_t word_len;
     unsigned long int num;
     enum ly_stmt kw;

     if (*fracdig) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "fraction-digits");
         return LY_EVALID;
     }

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if (!word_len || (word[0] == '0') || !isdigit(word[0])) {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "fraction-digits");
         free(buf);
         return LY_EVALID;
     }

     errno = 0;
     num = strtoul(word, &ptr, LY_BASE_DEC);
     /* we have not parsed the whole argument */
     if ((size_t)(ptr - word) != word_len) {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "fraction-digits");
         free(buf);
         return LY_EVALID;
     }
     if ((errno == ERANGE) || (num > LY_TYPE_DEC64_FD_MAX)) {
         LOGVAL_PARSER(ctx, LY_VCODE_OOB, word_len, word, "fraction-digits");
         free(buf);
         return LY_EVALID;
     }
     *fracdig = num;
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_FRACTION_DIGITS, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "fraction-digits");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the require-instance statement. Substatement of type statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] reqinst Value to write to.
  * @param[in,out] flags Flags to write to.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_type_reqinstance(struct lys_yang_parser_ctx *ctx, uint8_t *reqinst, uint16_t *flags,
         struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     if (*flags & LYS_SET_REQINST) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "require-instance");
         return LY_EVALID;
     }
     *flags |= LYS_SET_REQINST;

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if ((word_len == ly_strlen_const("true")) && !strncmp(word, "true", word_len)) {
         *reqinst = 1;
     } else if ((word_len != ly_strlen_const("false")) || strncmp(word, "false", word_len)) {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "require-instance");
         free(buf);
         return LY_EVALID;
     }
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_REQUIRE_INSTANCE, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "require-instance");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the modifier statement. Substatement of type pattern statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] pat Value to write to.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_type_pattern_modifier(struct lys_yang_parser_ctx *ctx, const char **pat, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     if ((*pat)[0] == LYSP_RESTR_PATTERN_NACK) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "modifier");
         return LY_EVALID;
     }

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if ((word_len != ly_strlen_const("invert-match")) || strncmp(word, "invert-match", word_len)) {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "modifier");
         free(buf);
         return LY_EVALID;
     }
     free(buf);

     /* replace the value in the dictionary */
     buf = malloc(strlen(*pat) + 1);
     LY_CHECK_ERR_RET(!buf, LOGMEM(PARSER_CTX(ctx)), LY_EMEM);
     strcpy(buf, *pat);
     lydict_remove(PARSER_CTX(ctx), *pat);

     assert(buf[0] == LYSP_RESTR_PATTERN_ACK);
     buf[0] = LYSP_RESTR_PATTERN_NACK;
     LY_CHECK_RET(lydict_insert_zc(PARSER_CTX(ctx), buf, pat));

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_MODIFIER, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "modifier");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the pattern statement. Substatement of type statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] patterns Restrictions to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_type_pattern(struct lys_yang_parser_ctx *ctx, struct lysp_restr **patterns)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_restr *restr;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *patterns, restr, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     /* add special meaning first byte */
     if (buf) {
         buf = ly_realloc(buf, word_len + 2);
         word = buf;
     } else {
         buf = malloc(word_len + 2);
     }
     LY_CHECK_ERR_RET(!buf, LOGMEM(PARSER_CTX(ctx)), LY_EMEM);
     memmove(buf + 1, word, word_len);
     buf[0] = LYSP_RESTR_PATTERN_ACK; /* pattern's default regular-match flag */
     buf[word_len + 1] = '\0'; /* terminating NULL byte */
     LY_CHECK_RET(lydict_insert_zc(PARSER_CTX(ctx), buf, &restr->arg.str));
     restr->arg.mod = ctx->parsed_mod;

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &restr->dsc, Y_STR_ARG, &restr->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &restr->ref, Y_STR_ARG, &restr->exts));
             break;
         case LY_STMT_ERROR_APP_TAG:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_ERROR_APP_TAG, 0, &restr->eapptag, Y_STR_ARG, &restr->exts));
             break;
         case LY_STMT_ERROR_MESSAGE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_ERROR_MESSAGE, 0, &restr->emsg, Y_STR_ARG, &restr->exts));
             break;
         case LY_STMT_MODIFIER:
             PARSER_CHECK_STMTVER2_RET(ctx, "modifier", "pattern");
             LY_CHECK_RET(parse_type_pattern_modifier(ctx, &restr->arg.str, &restr->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_PATTERN, 0, &restr->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "pattern");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the type statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] type Type to wrote to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_type(struct lys_yang_parser_ctx *ctx, struct lysp_type *type)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     const char *str_path = NULL;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_type *nest_type;

     if (type->name) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "type");
         return LY_EVALID;
     }

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_PREF_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, type->name, word, word_len);

     /* set module */
     type->pmod = ctx->parsed_mod;

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_BASE:
             LY_CHECK_RET(parse_text_fields(ctx, LY_STMT_BASE, &type->bases, Y_PREF_IDENTIF_ARG, &type->exts));
             type->flags |= LYS_SET_BASE;
             break;
         case LY_STMT_BIT:
             LY_CHECK_RET(parse_type_enum(ctx, kw, &type->bits));
             type->flags |= LYS_SET_BIT;
             break;
         case LY_STMT_ENUM:
             LY_CHECK_RET(parse_type_enum(ctx, kw, &type->enums));
             type->flags |= LYS_SET_ENUM;
             break;
         case LY_STMT_FRACTION_DIGITS:
             LY_CHECK_RET(parse_type_fracdigits(ctx, &type->fraction_digits, &type->exts));
             type->flags |= LYS_SET_FRDIGITS;
             break;
         case LY_STMT_LENGTH:
             if (type->length) {
                 LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, ly_stmt2str(kw));
                 return LY_EVALID;
             }
             type->length = calloc(1, sizeof *type->length);
             LY_CHECK_ERR_RET(!type->length, LOGMEM(PARSER_CTX(ctx)), LY_EMEM);

             LY_CHECK_RET(parse_restr(ctx, kw, type->length));
             type->flags |= LYS_SET_LENGTH;
             break;
         case LY_STMT_PATH:
             if (type->path) {
                 LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, ly_stmt2str(LY_STMT_PATH));
                 return LY_EVALID;
             }

             /* Usually, in the parser_yang.c, the result of the parsing is stored directly in the
              * corresponding structure, so in case of failure, the lysp_module_free function will take
              * care of removing the parsed value from the dictionary. But in this case, it is not possible
              * to rely on lysp_module_free because the result of the parsing is stored in a local variable.
              */
             LY_CHECK_ERR_RET(ret = parse_text_field(ctx, LY_STMT_PATH, 0, &str_path, Y_STR_ARG, &type->exts),
                     lydict_remove(PARSER_CTX(ctx), str_path), ret);
             ret = ly_path_parse(PARSER_CTX(ctx), NULL, str_path, 0, LY_PATH_BEGIN_EITHER, LY_PATH_LREF_TRUE,
                     LY_PATH_PREFIX_OPTIONAL, LY_PATH_PRED_LEAFREF, &type->path);
             /* Moreover, even if successful, the string is removed from the dictionary. */
             lydict_remove(PARSER_CTX(ctx), str_path);
             LY_CHECK_RET(ret);
             type->flags |= LYS_SET_PATH;
             break;
         case LY_STMT_PATTERN:
             LY_CHECK_RET(parse_type_pattern(ctx, &type->patterns));
             type->flags |= LYS_SET_PATTERN;
             break;
         case LY_STMT_RANGE:
             if (type->range) {
                 LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, ly_stmt2str(kw));
                 return LY_EVALID;
             }
             type->range = calloc(1, sizeof *type->range);
             LY_CHECK_ERR_RET(!type->range, LOGMEM(PARSER_CTX(ctx)), LY_EMEM);

             LY_CHECK_RET(parse_restr(ctx, kw, type->range));
             type->flags |= LYS_SET_RANGE;
             break;
         case LY_STMT_REQUIRE_INSTANCE:
             LY_CHECK_RET(parse_type_reqinstance(ctx, &type->require_instance, &type->flags, &type->exts));
             /* LYS_SET_REQINST checked and set inside parse_type_reqinstance() */
             break;
         case LY_STMT_TYPE:
             LY_ARRAY_NEW_RET(PARSER_CTX(ctx), type->types, nest_type, LY_EMEM);
             LY_CHECK_RET(parse_type(ctx, nest_type));
             type->flags |= LYS_SET_TYPE;
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_TYPE, 0, &type->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "type");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the leaf statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] siblings Siblings to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_leaf(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node **siblings)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_node_leaf *leaf;

     /* create new leaf structure */
     LY_LIST_NEW_RET(PARSER_CTX(ctx), siblings, leaf, next, LY_EMEM);
     leaf->nodetype = LYS_LEAF;
     leaf->parent = parent;

     /* get name */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, leaf->name, word, word_len);

     /* parse substatements */
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, goto checks, return ret) {
         switch (kw) {
         case LY_STMT_CONFIG:
             LY_CHECK_RET(parse_config(ctx, &leaf->flags, &leaf->exts));
             break;
         case LY_STMT_DEFAULT:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DEFAULT, 0, &leaf->dflt.str, Y_STR_ARG, &leaf->exts));
             leaf->dflt.mod = ctx->parsed_mod;
             break;
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &leaf->dsc, Y_STR_ARG, &leaf->exts));
             break;
         case LY_STMT_IF_FEATURE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &leaf->iffeatures, Y_STR_ARG, &leaf->exts));
             break;
         case LY_STMT_MANDATORY:
             LY_CHECK_RET(parse_mandatory(ctx, &leaf->flags, &leaf->exts));
             break;
         case LY_STMT_MUST:
             LY_CHECK_RET(parse_restrs(ctx, kw, &leaf->musts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &leaf->ref, Y_STR_ARG, &leaf->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &leaf->flags, &leaf->exts));
             break;
         case LY_STMT_TYPE:
             LY_CHECK_RET(parse_type(ctx, &leaf->type));
             break;
         case LY_STMT_UNITS:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_UNITS, 0, &leaf->units, Y_STR_ARG, &leaf->exts));
             break;
         case LY_STMT_WHEN:
             LY_CHECK_RET(parse_when(ctx, &leaf->when));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_LEAF, 0, &leaf->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "leaf");
             return LY_EVALID;
         }
     }
     LY_CHECK_RET(ret);
 checks:
     /* mandatory substatements */
     if (!leaf->type.name) {
         LOGVAL_PARSER(ctx, LY_VCODE_MISSTMT, "type", "leaf");
         return LY_EVALID;
     }

     return ret;
 }

 /**
  * @brief Parse the max-elements statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] max Value to write to.
  * @param[in,out] flags Flags to write to.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_maxelements(struct lys_yang_parser_ctx *ctx, uint32_t *max, uint16_t *flags, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word, *ptr;
     size_t word_len;
     unsigned long int num;
     enum ly_stmt kw;

     if (*flags & LYS_SET_MAX) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "max-elements");
         return LY_EVALID;
     }
     *flags |= LYS_SET_MAX;

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if (!word_len || (word[0] == '0') || ((word[0] != 'u') && !isdigit(word[0]))) {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "max-elements");
         free(buf);
         return LY_EVALID;
     }

     if (ly_strncmp("unbounded", word, word_len)) {
         errno = 0;
         num = strtoul(word, &ptr, LY_BASE_DEC);
         /* we have not parsed the whole argument */
         if ((size_t)(ptr - word) != word_len) {
             LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "max-elements");
             free(buf);
             return LY_EVALID;
         }
         if ((errno == ERANGE) || (num > UINT32_MAX)) {
             LOGVAL_PARSER(ctx, LY_VCODE_OOB, word_len, word, "max-elements");
             free(buf);
             return LY_EVALID;
         }

         *max = num;
     } else {
         /* unbounded */
         *max = 0;
     }
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_MAX_ELEMENTS, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "max-elements");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the min-elements statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] min Value to write to.
  * @param[in,out] flags Flags to write to.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_minelements(struct lys_yang_parser_ctx *ctx, uint32_t *min, uint16_t *flags, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word, *ptr;
     size_t word_len;
     unsigned long int num;
     enum ly_stmt kw;

     if (*flags & LYS_SET_MIN) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "min-elements");
         return LY_EVALID;
     }
     *flags |= LYS_SET_MIN;

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if (!word_len || !isdigit(word[0]) || ((word[0] == '0') && (word_len > 1))) {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "min-elements");
         free(buf);
         return LY_EVALID;
     }

     errno = 0;
     num = strtoul(word, &ptr, LY_BASE_DEC);
     /* we have not parsed the whole argument */
     if ((size_t)(ptr - word) != word_len) {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "min-elements");
         free(buf);
         return LY_EVALID;
     }
     if ((errno == ERANGE) || (num > UINT32_MAX)) {
         LOGVAL_PARSER(ctx, LY_VCODE_OOB, word_len, word, "min-elements");
         free(buf);
         return LY_EVALID;
     }
     *min = num;
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_MIN_ELEMENTS, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "min-elements");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the ordered-by statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] flags Flags to write to.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_orderedby(struct lys_yang_parser_ctx *ctx, uint16_t *flags, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     if (*flags & LYS_ORDBY_MASK) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "ordered-by");
         return LY_EVALID;
     }

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if ((word_len == ly_strlen_const("system")) && !strncmp(word, "system", word_len)) {
         *flags |= LYS_ORDBY_SYSTEM;
     } else if ((word_len == ly_strlen_const("user")) && !strncmp(word, "user", word_len)) {
         *flags |= LYS_ORDBY_USER;
     } else {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "ordered-by");
         free(buf);
         return LY_EVALID;
     }
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_ORDERED_BY, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "ordered-by");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the leaf-list statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] siblings Siblings to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_leaflist(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node **siblings)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_node_leaflist *llist;

     /* create new leaf-list structure */
     LY_LIST_NEW_RET(PARSER_CTX(ctx), siblings, llist, next, LY_EMEM);
     llist->nodetype = LYS_LEAFLIST;
     llist->parent = parent;

     /* get name */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, llist->name, word, word_len);

     /* parse substatements */
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, goto checks, return ret) {
         switch (kw) {
         case LY_STMT_CONFIG:
             LY_CHECK_RET(parse_config(ctx, &llist->flags, &llist->exts));
             break;
         case LY_STMT_DEFAULT:
             PARSER_CHECK_STMTVER2_RET(ctx, "default", "leaf-list");
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_DEFAULT, &llist->dflts, Y_STR_ARG, &llist->exts));
             break;
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &llist->dsc, Y_STR_ARG, &llist->exts));
             break;
         case LY_STMT_IF_FEATURE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &llist->iffeatures, Y_STR_ARG, &llist->exts));
             break;
         case LY_STMT_MAX_ELEMENTS:
             LY_CHECK_RET(parse_maxelements(ctx, &llist->max, &llist->flags, &llist->exts));
             break;
         case LY_STMT_MIN_ELEMENTS:
             LY_CHECK_RET(parse_minelements(ctx, &llist->min, &llist->flags, &llist->exts));
             break;
         case LY_STMT_MUST:
             LY_CHECK_RET(parse_restrs(ctx, kw, &llist->musts));
             break;
         case LY_STMT_ORDERED_BY:
             LY_CHECK_RET(parse_orderedby(ctx, &llist->flags, &llist->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &llist->ref, Y_STR_ARG, &llist->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &llist->flags, &llist->exts));
             break;
         case LY_STMT_TYPE:
             LY_CHECK_RET(parse_type(ctx, &llist->type));
             break;
         case LY_STMT_UNITS:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_UNITS, 0, &llist->units, Y_STR_ARG, &llist->exts));
             break;
         case LY_STMT_WHEN:
             LY_CHECK_RET(parse_when(ctx, &llist->when));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_LEAF_LIST, 0, &llist->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "llist");
             return LY_EVALID;
         }
     }
     LY_CHECK_RET(ret);
 checks:
     /* mandatory substatements */
     if (!llist->type.name) {
         LOGVAL_PARSER(ctx, LY_VCODE_MISSTMT, "type", "leaf-list");
         return LY_EVALID;
     }

     return ret;
 }

 /**
  * @brief Parse the refine statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] refines Refines to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_refine(struct lys_yang_parser_ctx *ctx, struct lysp_refine **refines)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_refine *rf;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *refines, rf, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));
     CHECK_NONEMPTY(ctx, word_len, "refine");
     INSERT_WORD_RET(ctx, buf, rf->nodeid, word, word_len);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_CONFIG:
             LY_CHECK_RET(parse_config(ctx, &rf->flags, &rf->exts));
             break;
         case LY_STMT_DEFAULT:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_DEFAULT, &rf->dflts, Y_STR_ARG, &rf->exts));
             break;
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &rf->dsc, Y_STR_ARG, &rf->exts));
             break;
         case LY_STMT_IF_FEATURE:
             PARSER_CHECK_STMTVER2_RET(ctx, "if-feature", "refine");
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &rf->iffeatures, Y_STR_ARG, &rf->exts));
             break;
         case LY_STMT_MAX_ELEMENTS:
             LY_CHECK_RET(parse_maxelements(ctx, &rf->max, &rf->flags, &rf->exts));
             break;
         case LY_STMT_MIN_ELEMENTS:
             LY_CHECK_RET(parse_minelements(ctx, &rf->min, &rf->flags, &rf->exts));
             break;
         case LY_STMT_MUST:
             LY_CHECK_RET(parse_restrs(ctx, kw, &rf->musts));
             break;
         case LY_STMT_MANDATORY:
             LY_CHECK_RET(parse_mandatory(ctx, &rf->flags, &rf->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &rf->ref, Y_STR_ARG, &rf->exts));
             break;
         case LY_STMT_PRESENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_PRESENCE, 0, &rf->presence, Y_STR_ARG, &rf->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_REFINE, 0, &rf->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "refine");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the typedef statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] typedefs Typedefs to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_typedef(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_tpdf **typedefs)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_tpdf *tpdf;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *typedefs, tpdf, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, tpdf->name, word, word_len);

     /* parse substatements */
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, goto checks, return ret) {
         switch (kw) {
         case LY_STMT_DEFAULT:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DEFAULT, 0, &tpdf->dflt.str, Y_STR_ARG, &tpdf->exts));
             tpdf->dflt.mod = ctx->parsed_mod;
             break;
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &tpdf->dsc, Y_STR_ARG, &tpdf->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &tpdf->ref, Y_STR_ARG, &tpdf->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &tpdf->flags, &tpdf->exts));
             break;
         case LY_STMT_TYPE:
             LY_CHECK_RET(parse_type(ctx, &tpdf->type));
             break;
         case LY_STMT_UNITS:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_UNITS, 0, &tpdf->units, Y_STR_ARG, &tpdf->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_TYPEDEF, 0, &tpdf->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "typedef");
             return LY_EVALID;
         }
     }
     LY_CHECK_RET(ret);
 checks:
     /* mandatory substatements */
     if (!tpdf->type.name) {
         LOGVAL_PARSER(ctx, LY_VCODE_MISSTMT, "type", "typedef");
         return LY_EVALID;
     }

     /* store data for collision check */
     if (parent && !(parent->nodetype & (LYS_GROUPING | LYS_RPC | LYS_ACTION | LYS_INPUT | LYS_OUTPUT | LYS_NOTIF))) {
         LY_CHECK_RET(ly_set_add(&ctx->tpdfs_nodes, parent, 0, NULL));
     }

     return ret;
 }

 /**
  * @brief Parse the input or output statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in] kw Type of this particular keyword
  * @param[in,out] inout_p Input/output pointer to write to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_inout(struct lys_yang_parser_ctx *ctx, enum ly_stmt inout_kw, struct lysp_node *parent,
         struct lysp_node_action_inout *inout_p)
 {
     LY_ERR ret = LY_SUCCESS;
     char *word;
     size_t word_len;
     enum ly_stmt kw;
     ly_bool input = &((struct lysp_node_action *)parent)->input == inout_p ? 1 : 0;

     if (inout_p->nodetype) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, ly_stmt2str(inout_kw));
         return LY_EVALID;
     }

     /* initiate structure */
     LY_CHECK_RET(lydict_insert(PARSER_CTX(ctx), input ? "input" : "output", 0, &inout_p->name));
     inout_p->nodetype = input ? LYS_INPUT : LYS_OUTPUT;
     inout_p->parent = parent;

     /* parse substatements */
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, goto checks, return ret) {
         switch (kw) {
         case LY_STMT_ANYDATA:
             PARSER_CHECK_STMTVER2_RET(ctx, "anydata", ly_stmt2str(inout_kw));
         /* fall through */
         case LY_STMT_ANYXML:
             LY_CHECK_RET(parse_any(ctx, kw, (struct lysp_node *)inout_p, &inout_p->child));
             break;
         case LY_STMT_CHOICE:
             LY_CHECK_RET(parse_choice(ctx, (struct lysp_node *)inout_p, &inout_p->child));
             break;
         case LY_STMT_CONTAINER:
             LY_CHECK_RET(parse_container(ctx, (struct lysp_node *)inout_p, &inout_p->child));
             break;
         case LY_STMT_LEAF:
             LY_CHECK_RET(parse_leaf(ctx, (struct lysp_node *)inout_p, &inout_p->child));
             break;
         case LY_STMT_LEAF_LIST:
             LY_CHECK_RET(parse_leaflist(ctx, (struct lysp_node *)inout_p, &inout_p->child));
             break;
         case LY_STMT_LIST:
             LY_CHECK_RET(parse_list(ctx, (struct lysp_node *)inout_p, &inout_p->child));
             break;
         case LY_STMT_USES:
             LY_CHECK_RET(parse_uses(ctx, (struct lysp_node *)inout_p, &inout_p->child));
             break;
         case LY_STMT_TYPEDEF:
             LY_CHECK_RET(parse_typedef(ctx, (struct lysp_node *)inout_p, &inout_p->typedefs));
             break;
         case LY_STMT_MUST:
             PARSER_CHECK_STMTVER2_RET(ctx, "must", ly_stmt2str(inout_kw));
             LY_CHECK_RET(parse_restrs(ctx, kw, &inout_p->musts));
             break;
         case LY_STMT_GROUPING:
             LY_CHECK_RET(parse_grouping(ctx, (struct lysp_node *)inout_p, &inout_p->groupings));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, inout_kw, 0, &inout_p->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), ly_stmt2str(inout_kw));
             return LY_EVALID;
         }
     }
     LY_CHECK_RET(ret);

 checks:
     if (!inout_p->child) {
         LOGVAL_PARSER(ctx, LY_VCODE_MISSTMT, "data-def-stmt", ly_stmt2str(inout_kw));
         return LY_EVALID;
     }

     return ret;
 }

 /**
  * @brief Parse the action statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] actions Actions to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_action(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node_action **actions)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_node_action *act;

     LY_LIST_NEW_RET(PARSER_CTX(ctx), actions, act, next, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, act->name, word, word_len);
     act->nodetype = parent ? LYS_ACTION : LYS_RPC;
     act->parent = parent;

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, goto checks, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &act->dsc, Y_STR_ARG, &act->exts));
             break;
         case LY_STMT_IF_FEATURE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &act->iffeatures, Y_STR_ARG, &act->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &act->ref, Y_STR_ARG, &act->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &act->flags, &act->exts));
             break;

         case LY_STMT_INPUT:
             LY_CHECK_RET(parse_inout(ctx, kw, (struct lysp_node *)act, &act->input));
             break;
         case LY_STMT_OUTPUT:
             LY_CHECK_RET(parse_inout(ctx, kw, (struct lysp_node *)act, &act->output));
             break;

         case LY_STMT_TYPEDEF:
             LY_CHECK_RET(parse_typedef(ctx, (struct lysp_node *)act, &act->typedefs));
             break;
         case LY_STMT_GROUPING:
             LY_CHECK_RET(parse_grouping(ctx, (struct lysp_node *)act, &act->groupings));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, parent ? LY_STMT_ACTION : LY_STMT_RPC, 0, &act->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), parent ? "action" : "rpc");
             return LY_EVALID;
         }
     }
     LY_CHECK_RET(ret);

 checks:
     /* always initialize inout, they are technically present (needed for later deviations/refines) */
     if (!act->input.nodetype) {
         act->input.nodetype = LYS_INPUT;
         act->input.parent = (struct lysp_node *)act;
         LY_CHECK_RET(lydict_insert(PARSER_CTX(ctx), "input", 0, &act->input.name));
     }
     if (!act->output.nodetype) {
         act->output.nodetype = LYS_OUTPUT;
         act->output.parent = (struct lysp_node *)act;
         LY_CHECK_RET(lydict_insert(PARSER_CTX(ctx), "output", 0, &act->output.name));
     }

     return ret;
 }

 /**
  * @brief Parse the notification statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] notifs Notifications to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_notif(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node_notif **notifs)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_node_notif *notif;

     LY_LIST_NEW_RET(PARSER_CTX(ctx), notifs, notif, next, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, notif->name, word, word_len);
     notif->nodetype = LYS_NOTIF;
     notif->parent = parent;

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &notif->dsc, Y_STR_ARG, &notif->exts));
             break;
         case LY_STMT_IF_FEATURE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &notif->iffeatures, Y_STR_ARG, &notif->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &notif->ref, Y_STR_ARG, &notif->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &notif->flags, &notif->exts));
             break;

         case LY_STMT_ANYDATA:
             PARSER_CHECK_STMTVER2_RET(ctx, "anydata", "notification");
         /* fall through */
         case LY_STMT_ANYXML:
             LY_CHECK_RET(parse_any(ctx, kw, (struct lysp_node *)notif, &notif->child));
             break;
         case LY_STMT_CHOICE:
             LY_CHECK_RET(parse_choice(ctx, (struct lysp_node *)notif, &notif->child));
             break;
         case LY_STMT_CONTAINER:
             LY_CHECK_RET(parse_container(ctx, (struct lysp_node *)notif, &notif->child));
             break;
         case LY_STMT_LEAF:
             LY_CHECK_RET(parse_leaf(ctx, (struct lysp_node *)notif, &notif->child));
             break;
         case LY_STMT_LEAF_LIST:
             LY_CHECK_RET(parse_leaflist(ctx, (struct lysp_node *)notif, &notif->child));
             break;
         case LY_STMT_LIST:
             LY_CHECK_RET(parse_list(ctx, (struct lysp_node *)notif, &notif->child));
             break;
         case LY_STMT_USES:
             LY_CHECK_RET(parse_uses(ctx, (struct lysp_node *)notif, &notif->child));
             break;

         case LY_STMT_MUST:
             PARSER_CHECK_STMTVER2_RET(ctx, "must", "notification");
             LY_CHECK_RET(parse_restrs(ctx, kw, &notif->musts));
             break;
         case LY_STMT_TYPEDEF:
             LY_CHECK_RET(parse_typedef(ctx, (struct lysp_node *)notif, &notif->typedefs));
             break;
         case LY_STMT_GROUPING:
             LY_CHECK_RET(parse_grouping(ctx, (struct lysp_node *)notif, &notif->groupings));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_NOTIFICATION, 0, &notif->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "notification");
             return LY_EVALID;
         }
     }

     return ret;
 }

 /**
  * @brief Parse the grouping statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] groupings Groupings to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_grouping(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node_grp **groupings)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_node_grp *grp;

     LY_LIST_NEW_RET(PARSER_CTX(ctx), groupings, grp, next, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, grp->name, word, word_len);
     grp->nodetype = LYS_GROUPING;
     grp->parent = parent;

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &grp->dsc, Y_STR_ARG, &grp->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &grp->ref, Y_STR_ARG, &grp->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &grp->flags, &grp->exts));
             break;

         case LY_STMT_ANYDATA:
             PARSER_CHECK_STMTVER2_RET(ctx, "anydata", "grouping");
         /* fall through */
         case LY_STMT_ANYXML:
             LY_CHECK_RET(parse_any(ctx, kw, &grp->node, &grp->child));
             break;
         case LY_STMT_CHOICE:
             LY_CHECK_RET(parse_choice(ctx, &grp->node, &grp->child));
             break;
         case LY_STMT_CONTAINER:
             LY_CHECK_RET(parse_container(ctx, &grp->node, &grp->child));
             break;
         case LY_STMT_LEAF:
             LY_CHECK_RET(parse_leaf(ctx, &grp->node, &grp->child));
             break;
         case LY_STMT_LEAF_LIST:
             LY_CHECK_RET(parse_leaflist(ctx, &grp->node, &grp->child));
             break;
         case LY_STMT_LIST:
             LY_CHECK_RET(parse_list(ctx, &grp->node, &grp->child));
             break;
         case LY_STMT_USES:
             LY_CHECK_RET(parse_uses(ctx, &grp->node, &grp->child));
             break;

         case LY_STMT_TYPEDEF:
             LY_CHECK_RET(parse_typedef(ctx, &grp->node, &grp->typedefs));
             break;
         case LY_STMT_ACTION:
             PARSER_CHECK_STMTVER2_RET(ctx, "action", "grouping");
             LY_CHECK_RET(parse_action(ctx, &grp->node, &grp->actions));
             break;
         case LY_STMT_GROUPING:
             LY_CHECK_RET(parse_grouping(ctx, &grp->node, &grp->groupings));
             break;
         case LY_STMT_NOTIFICATION:
             PARSER_CHECK_STMTVER2_RET(ctx, "notification", "grouping");
             LY_CHECK_RET(parse_notif(ctx, &grp->node, &grp->notifs));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_GROUPING, 0, &grp->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "grouping");
             return LY_EVALID;
         }
     }

     return ret;
 }

 /**
  * @brief Parse the augment statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] augments Augments to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_augment(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node_augment **augments)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_node_augment *aug;

     LY_LIST_NEW_RET(PARSER_CTX(ctx), augments, aug, next, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));
     CHECK_NONEMPTY(ctx, word_len, "augment");
     INSERT_WORD_RET(ctx, buf, aug->nodeid, word, word_len);
     aug->nodetype = LYS_AUGMENT;
     aug->parent = parent;

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &aug->dsc, Y_STR_ARG, &aug->exts));
             break;
         case LY_STMT_IF_FEATURE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &aug->iffeatures, Y_STR_ARG, &aug->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &aug->ref, Y_STR_ARG, &aug->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &aug->flags, &aug->exts));
             break;
         case LY_STMT_WHEN:
             LY_CHECK_RET(parse_when(ctx, &aug->when));
             break;

         case LY_STMT_ANYDATA:
             PARSER_CHECK_STMTVER2_RET(ctx, "anydata", "augment");
         /* fall through */
         case LY_STMT_ANYXML:
             LY_CHECK_RET(parse_any(ctx, kw, (struct lysp_node *)aug, &aug->child));
             break;
         case LY_STMT_CASE:
             LY_CHECK_RET(parse_case(ctx, (struct lysp_node *)aug, &aug->child));
             break;
         case LY_STMT_CHOICE:
             LY_CHECK_RET(parse_choice(ctx, (struct lysp_node *)aug, &aug->child));
             break;
         case LY_STMT_CONTAINER:
             LY_CHECK_RET(parse_container(ctx, (struct lysp_node *)aug, &aug->child));
             break;
         case LY_STMT_LEAF:
             LY_CHECK_RET(parse_leaf(ctx, (struct lysp_node *)aug, &aug->child));
             break;
         case LY_STMT_LEAF_LIST:
             LY_CHECK_RET(parse_leaflist(ctx, (struct lysp_node *)aug, &aug->child));
             break;
         case LY_STMT_LIST:
             LY_CHECK_RET(parse_list(ctx, (struct lysp_node *)aug, &aug->child));
             break;
         case LY_STMT_USES:
             LY_CHECK_RET(parse_uses(ctx, (struct lysp_node *)aug, &aug->child));
             break;

         case LY_STMT_ACTION:
             PARSER_CHECK_STMTVER2_RET(ctx, "action", "augment");
             LY_CHECK_RET(parse_action(ctx, (struct lysp_node *)aug, &aug->actions));
             break;
         case LY_STMT_NOTIFICATION:
             PARSER_CHECK_STMTVER2_RET(ctx, "notification", "augment");
             LY_CHECK_RET(parse_notif(ctx, (struct lysp_node *)aug, &aug->notifs));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_AUGMENT, 0, &aug->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "augment");
             return LY_EVALID;
         }
     }

     return ret;
 }

 /**
  * @brief Parse the uses statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] siblings Siblings to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_uses(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node **siblings)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_node_uses *uses;

     /* create uses structure */
     LY_LIST_NEW_RET(PARSER_CTX(ctx), siblings, uses, next, LY_EMEM);
     uses->nodetype = LYS_USES;
     uses->parent = parent;

     /* get name */
     LY_CHECK_RET(get_argument(ctx, Y_PREF_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, uses->name, word, word_len);

     /* parse substatements */
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &uses->dsc, Y_STR_ARG, &uses->exts));
             break;
         case LY_STMT_IF_FEATURE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &uses->iffeatures, Y_STR_ARG, &uses->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &uses->ref, Y_STR_ARG, &uses->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &uses->flags, &uses->exts));
             break;
         case LY_STMT_WHEN:
             LY_CHECK_RET(parse_when(ctx, &uses->when));
             break;

         case LY_STMT_REFINE:
             LY_CHECK_RET(parse_refine(ctx, &uses->refines));
             break;
         case LY_STMT_AUGMENT:
             LY_CHECK_RET(parse_augment(ctx, (struct lysp_node *)uses, &uses->augments));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_USES, 0, &uses->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "uses");
             return LY_EVALID;
         }
     }

     return ret;
 }

 /**
  * @brief Parse the case statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] siblings Siblings to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_case(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node **siblings)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_node_case *cas;

     /* create new case structure */
     LY_LIST_NEW_RET(PARSER_CTX(ctx), siblings, cas, next, LY_EMEM);
     cas->nodetype = LYS_CASE;
     cas->parent = parent;

     /* get name */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, cas->name, word, word_len);

     /* parse substatements */
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &cas->dsc, Y_STR_ARG, &cas->exts));
             break;
         case LY_STMT_IF_FEATURE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &cas->iffeatures, Y_STR_ARG, &cas->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &cas->ref, Y_STR_ARG, &cas->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &cas->flags, &cas->exts));
             break;
         case LY_STMT_WHEN:
             LY_CHECK_RET(parse_when(ctx, &cas->when));
             break;

         case LY_STMT_ANYDATA:
             PARSER_CHECK_STMTVER2_RET(ctx, "anydata", "case");
         /* fall through */
         case LY_STMT_ANYXML:
             LY_CHECK_RET(parse_any(ctx, kw, (struct lysp_node *)cas, &cas->child));
             break;
         case LY_STMT_CHOICE:
             LY_CHECK_RET(parse_choice(ctx, (struct lysp_node *)cas, &cas->child));
             break;
         case LY_STMT_CONTAINER:
             LY_CHECK_RET(parse_container(ctx, (struct lysp_node *)cas, &cas->child));
             break;
         case LY_STMT_LEAF:
             LY_CHECK_RET(parse_leaf(ctx, (struct lysp_node *)cas, &cas->child));
             break;
         case LY_STMT_LEAF_LIST:
             LY_CHECK_RET(parse_leaflist(ctx, (struct lysp_node *)cas, &cas->child));
             break;
         case LY_STMT_LIST:
             LY_CHECK_RET(parse_list(ctx, (struct lysp_node *)cas, &cas->child));
             break;
         case LY_STMT_USES:
             LY_CHECK_RET(parse_uses(ctx, (struct lysp_node *)cas, &cas->child));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_CASE, 0, &cas->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "case");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the choice statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] siblings Siblings to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_choice(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node **siblings)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_node_choice *choice;

     /* create new choice structure */
     LY_LIST_NEW_RET(PARSER_CTX(ctx), siblings, choice, next, LY_EMEM);
     choice->nodetype = LYS_CHOICE;
     choice->parent = parent;

     /* get name */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, choice->name, word, word_len);

     /* parse substatements */
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_CONFIG:
             LY_CHECK_RET(parse_config(ctx, &choice->flags, &choice->exts));
             break;
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &choice->dsc, Y_STR_ARG, &choice->exts));
             break;
         case LY_STMT_IF_FEATURE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &choice->iffeatures, Y_STR_ARG, &choice->exts));
             break;
         case LY_STMT_MANDATORY:
             LY_CHECK_RET(parse_mandatory(ctx, &choice->flags, &choice->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &choice->ref, Y_STR_ARG, &choice->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &choice->flags, &choice->exts));
             break;
         case LY_STMT_WHEN:
             LY_CHECK_RET(parse_when(ctx, &choice->when));
             break;
         case LY_STMT_DEFAULT:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DEFAULT, 0, &choice->dflt.str, Y_PREF_IDENTIF_ARG,
                     &choice->exts));
             choice->dflt.mod = ctx->parsed_mod;
             break;

         case LY_STMT_ANYDATA:
             PARSER_CHECK_STMTVER2_RET(ctx, "anydata", "choice");
         /* fall through */
         case LY_STMT_ANYXML:
             LY_CHECK_RET(parse_any(ctx, kw, (struct lysp_node *)choice, &choice->child));
             break;
         case LY_STMT_CASE:
             LY_CHECK_RET(parse_case(ctx, (struct lysp_node *)choice, &choice->child));
             break;
         case LY_STMT_CHOICE:
             PARSER_CHECK_STMTVER2_RET(ctx, "choice", "choice");
             LY_CHECK_RET(parse_choice(ctx, (struct lysp_node *)choice, &choice->child));
             break;
         case LY_STMT_CONTAINER:
             LY_CHECK_RET(parse_container(ctx, (struct lysp_node *)choice, &choice->child));
             break;
         case LY_STMT_LEAF:
             LY_CHECK_RET(parse_leaf(ctx, (struct lysp_node *)choice, &choice->child));
             break;
         case LY_STMT_LEAF_LIST:
             LY_CHECK_RET(parse_leaflist(ctx, (struct lysp_node *)choice, &choice->child));
             break;
         case LY_STMT_LIST:
             LY_CHECK_RET(parse_list(ctx, (struct lysp_node *)choice, &choice->child));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_CHOICE, 0, &choice->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "choice");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the container statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] siblings Siblings to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_container(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node **siblings)
 {
     LY_ERR ret = 0;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_node_container *cont;

     /* create new container structure */
     LY_LIST_NEW_RET(PARSER_CTX(ctx), siblings, cont, next, LY_EMEM);
     cont->nodetype = LYS_CONTAINER;
     cont->parent = parent;

     /* get name */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, cont->name, word, word_len);

     /* parse substatements */
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_CONFIG:
             LY_CHECK_RET(parse_config(ctx, &cont->flags, &cont->exts));
             break;
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &cont->dsc, Y_STR_ARG, &cont->exts));
             break;
         case LY_STMT_IF_FEATURE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &cont->iffeatures, Y_STR_ARG, &cont->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &cont->ref, Y_STR_ARG, &cont->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &cont->flags, &cont->exts));
             break;
         case LY_STMT_WHEN:
             LY_CHECK_RET(parse_when(ctx, &cont->when));
             break;
         case LY_STMT_PRESENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_PRESENCE, 0, &cont->presence, Y_STR_ARG, &cont->exts));
             break;

         case LY_STMT_ANYDATA:
             PARSER_CHECK_STMTVER2_RET(ctx, "anydata", "container");
         /* fall through */
         case LY_STMT_ANYXML:
             LY_CHECK_RET(parse_any(ctx, kw, (struct lysp_node *)cont, &cont->child));
             break;
         case LY_STMT_CHOICE:
             LY_CHECK_RET(parse_choice(ctx, (struct lysp_node *)cont, &cont->child));
             break;
         case LY_STMT_CONTAINER:
             LY_CHECK_RET(parse_container(ctx, (struct lysp_node *)cont, &cont->child));
             break;
         case LY_STMT_LEAF:
             LY_CHECK_RET(parse_leaf(ctx, (struct lysp_node *)cont, &cont->child));
             break;
         case LY_STMT_LEAF_LIST:
             LY_CHECK_RET(parse_leaflist(ctx, (struct lysp_node *)cont, &cont->child));
             break;
         case LY_STMT_LIST:
             LY_CHECK_RET(parse_list(ctx, (struct lysp_node *)cont, &cont->child));
             break;
         case LY_STMT_USES:
             LY_CHECK_RET(parse_uses(ctx, (struct lysp_node *)cont, &cont->child));
             break;

         case LY_STMT_TYPEDEF:
             LY_CHECK_RET(parse_typedef(ctx, (struct lysp_node *)cont, &cont->typedefs));
             break;
         case LY_STMT_MUST:
             LY_CHECK_RET(parse_restrs(ctx, kw, &cont->musts));
             break;
         case LY_STMT_ACTION:
             PARSER_CHECK_STMTVER2_RET(ctx, "action", "container");
             LY_CHECK_RET(parse_action(ctx, (struct lysp_node *)cont, &cont->actions));
             break;
         case LY_STMT_GROUPING:
             LY_CHECK_RET(parse_grouping(ctx, (struct lysp_node *)cont, &cont->groupings));
             break;
         case LY_STMT_NOTIFICATION:
             PARSER_CHECK_STMTVER2_RET(ctx, "notification", "container");
             LY_CHECK_RET(parse_notif(ctx, (struct lysp_node *)cont, &cont->notifs));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_CONTAINER, 0, &cont->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "container");
             return LY_EVALID;
         }
     }

     return ret;
 }

 /**
  * @brief Parse the list statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] siblings Siblings to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_list(struct lys_yang_parser_ctx *ctx, struct lysp_node *parent, struct lysp_node **siblings)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_node_list *list;

     /* create new list structure */
     LY_LIST_NEW_RET(PARSER_CTX(ctx), siblings, list, next, LY_EMEM);
     list->nodetype = LYS_LIST;
     list->parent = parent;

     /* get name */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, list->name, word, word_len);

     /* parse substatements */
     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_CONFIG:
             LY_CHECK_RET(parse_config(ctx, &list->flags, &list->exts));
             break;
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &list->dsc, Y_STR_ARG, &list->exts));
             break;
         case LY_STMT_IF_FEATURE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &list->iffeatures, Y_STR_ARG, &list->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &list->ref, Y_STR_ARG, &list->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &list->flags, &list->exts));
             break;
         case LY_STMT_WHEN:
             LY_CHECK_RET(parse_when(ctx, &list->when));
             break;
         case LY_STMT_KEY:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_KEY, 0, &list->key, Y_STR_ARG, &list->exts));
             break;
         case LY_STMT_MAX_ELEMENTS:
             LY_CHECK_RET(parse_maxelements(ctx, &list->max, &list->flags, &list->exts));
             break;
         case LY_STMT_MIN_ELEMENTS:
             LY_CHECK_RET(parse_minelements(ctx, &list->min, &list->flags, &list->exts));
             break;
         case LY_STMT_ORDERED_BY:
             LY_CHECK_RET(parse_orderedby(ctx, &list->flags, &list->exts));
             break;
         case LY_STMT_UNIQUE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_UNIQUE, &list->uniques, Y_STR_ARG, &list->exts));
             break;

         case LY_STMT_ANYDATA:
             PARSER_CHECK_STMTVER2_RET(ctx, "anydata", "list");
         /* fall through */
         case LY_STMT_ANYXML:
             LY_CHECK_RET(parse_any(ctx, kw, (struct lysp_node *)list, &list->child));
             break;
         case LY_STMT_CHOICE:
             LY_CHECK_RET(parse_choice(ctx, (struct lysp_node *)list, &list->child));
             break;
         case LY_STMT_CONTAINER:
             LY_CHECK_RET(parse_container(ctx, (struct lysp_node *)list, &list->child));
             break;
         case LY_STMT_LEAF:
             LY_CHECK_RET(parse_leaf(ctx, (struct lysp_node *)list, &list->child));
             break;
         case LY_STMT_LEAF_LIST:
             LY_CHECK_RET(parse_leaflist(ctx, (struct lysp_node *)list, &list->child));
             break;
         case LY_STMT_LIST:
             LY_CHECK_RET(parse_list(ctx, (struct lysp_node *)list, &list->child));
             break;
         case LY_STMT_USES:
             LY_CHECK_RET(parse_uses(ctx, (struct lysp_node *)list, &list->child));
             break;

         case LY_STMT_TYPEDEF:
             LY_CHECK_RET(parse_typedef(ctx, (struct lysp_node *)list, &list->typedefs));
             break;
         case LY_STMT_MUST:
             LY_CHECK_RET(parse_restrs(ctx, kw, &list->musts));
             break;
         case LY_STMT_ACTION:
             PARSER_CHECK_STMTVER2_RET(ctx, "action", "list");
             LY_CHECK_RET(parse_action(ctx, (struct lysp_node *)list, &list->actions));
             break;
         case LY_STMT_GROUPING:
             LY_CHECK_RET(parse_grouping(ctx, (struct lysp_node *)list, &list->groupings));
             break;
         case LY_STMT_NOTIFICATION:
             PARSER_CHECK_STMTVER2_RET(ctx, "notification", "list");
             LY_CHECK_RET(parse_notif(ctx, (struct lysp_node *)list, &list->notifs));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_LIST, 0, &list->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "list");
             return LY_EVALID;
         }
     }

     return ret;
 }

 /**
  * @brief Parse the yin-element statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] flags Flags to write to.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_yinelement(struct lys_yang_parser_ctx *ctx, uint16_t *flags, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     if (*flags & LYS_YINELEM_MASK) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "yin-element");
         return LY_EVALID;
     }

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if ((word_len == ly_strlen_const("true")) && !strncmp(word, "true", word_len)) {
         *flags |= LYS_YINELEM_TRUE;
     } else if ((word_len == ly_strlen_const("false")) && !strncmp(word, "false", word_len)) {
         *flags |= LYS_YINELEM_FALSE;
     } else {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "yin-element");
         free(buf);
         return LY_EVALID;
     }
     free(buf);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_YIN_ELEMENT, 0, exts));
             LY_CHECK_RET(ret);
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "yin-element");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the argument statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] argument Value to write to.
  * @param[in,out] flags Flags to write to.
  * @param[in,out] exts Extension instances to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_argument(struct lys_yang_parser_ctx *ctx, const char **argument, uint16_t *flags, struct lysp_ext_instance **exts)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;

     if (*argument) {
         LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, "argument");
         return LY_EVALID;
     }

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, *argument, word, word_len);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_YIN_ELEMENT:
             LY_CHECK_RET(parse_yinelement(ctx, flags, exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_ARGUMENT, 0, exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "argument");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the extension statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] extensions Extensions to add to.
  *
  * @return LY_ERR values.
  */
 static LY_ERR
 parse_extension(struct lys_yang_parser_ctx *ctx, struct lysp_ext **extensions)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_ext *ex;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *extensions, ex, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, ex->name, word, word_len);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &ex->dsc, Y_STR_ARG, &ex->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &ex->ref, Y_STR_ARG, &ex->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &ex->flags, &ex->exts));
             break;
         case LY_STMT_ARGUMENT:
             LY_CHECK_RET(parse_argument(ctx, &ex->argname, &ex->flags, &ex->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_EXTENSION, 0, &ex->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "extension");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the deviate statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] deviates Deviates to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_deviate(struct lys_yang_parser_ctx *ctx, struct lysp_deviate **deviates)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len, dev_mod;
     enum ly_stmt kw;
     struct lysp_deviate *d;
     struct lysp_deviate_add *d_add = NULL;
     struct lysp_deviate_rpl *d_rpl = NULL;
     struct lysp_deviate_del *d_del = NULL;
     const char **d_units = NULL;
     struct lysp_qname **d_uniques = NULL, **d_dflts = NULL;
     struct lysp_restr **d_musts = NULL;
     uint16_t *d_flags = 0;
     uint32_t *d_min = 0, *d_max = 0;

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));

     if ((word_len == ly_strlen_const("not-supported")) && !strncmp(word, "not-supported", word_len)) {
         dev_mod = LYS_DEV_NOT_SUPPORTED;
     } else if ((word_len == ly_strlen_const("add")) && !strncmp(word, "add", word_len)) {
         dev_mod = LYS_DEV_ADD;
     } else if ((word_len == ly_strlen_const("replace")) && !strncmp(word, "replace", word_len)) {
         dev_mod = LYS_DEV_REPLACE;
     } else if ((word_len == ly_strlen_const("delete")) && !strncmp(word, "delete", word_len)) {
         dev_mod = LYS_DEV_DELETE;
     } else {
         LOGVAL_PARSER(ctx, LY_VCODE_INVAL, word_len, word, "deviate");
         free(buf);
         return LY_EVALID;
     }
     free(buf);

     /* create structure */
     switch (dev_mod) {
     case LYS_DEV_NOT_SUPPORTED:
         d = calloc(1, sizeof *d);
         LY_CHECK_ERR_RET(!d, LOGMEM(PARSER_CTX(ctx)), LY_EMEM);
         break;
     case LYS_DEV_ADD:
         d_add = calloc(1, sizeof *d_add);
         LY_CHECK_ERR_RET(!d_add, LOGMEM(PARSER_CTX(ctx)), LY_EMEM);
         d = (struct lysp_deviate *)d_add;
         d_units = &d_add->units;
         d_uniques = &d_add->uniques;
         d_dflts = &d_add->dflts;
         d_musts = &d_add->musts;
         d_flags = &d_add->flags;
         d_min = &d_add->min;
         d_max = &d_add->max;
         break;
     case LYS_DEV_REPLACE:
         d_rpl = calloc(1, sizeof *d_rpl);
         LY_CHECK_ERR_RET(!d_rpl, LOGMEM(PARSER_CTX(ctx)), LY_EMEM);
         d = (struct lysp_deviate *)d_rpl;
         d_units = &d_rpl->units;
         d_flags = &d_rpl->flags;
         d_min = &d_rpl->min;
         d_max = &d_rpl->max;
         break;
     case LYS_DEV_DELETE:
         d_del = calloc(1, sizeof *d_del);
         LY_CHECK_ERR_RET(!d_del, LOGMEM(PARSER_CTX(ctx)), LY_EMEM);
         d = (struct lysp_deviate *)d_del;
         d_units = &d_del->units;
         d_uniques = &d_del->uniques;
         d_dflts = &d_del->dflts;
         d_musts = &d_del->musts;
         break;
     default:
         assert(0);
         LOGINT_RET(PARSER_CTX(ctx));
     }
     d->mod = dev_mod;

     /* insert into siblings */
     LY_LIST_INSERT(deviates, d, next);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_CONFIG:
             switch (dev_mod) {
             case LYS_DEV_NOT_SUPPORTED:
             case LYS_DEV_DELETE:
                 LOGVAL_PARSER(ctx, LY_VCODE_INDEV, ly_devmod2str(dev_mod), ly_stmt2str(kw));
                 return LY_EVALID;
             default:
                 LY_CHECK_RET(parse_config(ctx, d_flags, &d->exts));
                 break;
             }
             break;
         case LY_STMT_DEFAULT:
             switch (dev_mod) {
             case LYS_DEV_NOT_SUPPORTED:
                 LOGVAL_PARSER(ctx, LY_VCODE_INDEV, ly_devmod2str(dev_mod), ly_stmt2str(kw));
                 return LY_EVALID;
             case LYS_DEV_REPLACE:
                 LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DEFAULT, 0, &d_rpl->dflt.str, Y_STR_ARG, &d->exts));
                 d_rpl->dflt.mod = ctx->parsed_mod;
                 break;
             default:
                 LY_CHECK_RET(parse_qnames(ctx, LY_STMT_DEFAULT, d_dflts, Y_STR_ARG, &d->exts));
                 break;
             }
             break;
         case LY_STMT_MANDATORY:
             switch (dev_mod) {
             case LYS_DEV_NOT_SUPPORTED:
             case LYS_DEV_DELETE:
                 LOGVAL_PARSER(ctx, LY_VCODE_INDEV, ly_devmod2str(dev_mod), ly_stmt2str(kw));
                 return LY_EVALID;
             default:
                 LY_CHECK_RET(parse_mandatory(ctx, d_flags, &d->exts));
                 break;
             }
             break;
         case LY_STMT_MAX_ELEMENTS:
             switch (dev_mod) {
             case LYS_DEV_NOT_SUPPORTED:
             case LYS_DEV_DELETE:
                 LOGVAL_PARSER(ctx, LY_VCODE_INDEV, ly_devmod2str(dev_mod), ly_stmt2str(kw));
                 return LY_EVALID;
             default:
                 LY_CHECK_RET(parse_maxelements(ctx, d_max, d_flags, &d->exts));
                 break;
             }
             break;
         case LY_STMT_MIN_ELEMENTS:
             switch (dev_mod) {
             case LYS_DEV_NOT_SUPPORTED:
             case LYS_DEV_DELETE:
                 LOGVAL_PARSER(ctx, LY_VCODE_INDEV, ly_devmod2str(dev_mod), ly_stmt2str(kw));
                 return LY_EVALID;
             default:
                 LY_CHECK_RET(parse_minelements(ctx, d_min, d_flags, &d->exts));
                 break;
             }
             break;
         case LY_STMT_MUST:
             switch (dev_mod) {
             case LYS_DEV_NOT_SUPPORTED:
             case LYS_DEV_REPLACE:
                 LOGVAL_PARSER(ctx, LY_VCODE_INDEV, ly_devmod2str(dev_mod), ly_stmt2str(kw));
                 return LY_EVALID;
             default:
                 LY_CHECK_RET(parse_restrs(ctx, kw, d_musts));
                 break;
             }
             break;
         case LY_STMT_TYPE:
             switch (dev_mod) {
             case LYS_DEV_NOT_SUPPORTED:
             case LYS_DEV_ADD:
             case LYS_DEV_DELETE:
                 LOGVAL_PARSER(ctx, LY_VCODE_INDEV, ly_devmod2str(dev_mod), ly_stmt2str(kw));
                 return LY_EVALID;
             default:
                 if (d_rpl->type) {
                     LOGVAL_PARSER(ctx, LY_VCODE_DUPSTMT, ly_stmt2str(kw));
                     return LY_EVALID;
                 }
                 d_rpl->type = calloc(1, sizeof *d_rpl->type);
                 LY_CHECK_ERR_RET(!d_rpl->type, LOGMEM(PARSER_CTX(ctx)), LY_EMEM);
                 LY_CHECK_RET(parse_type(ctx, d_rpl->type));
                 break;
             }
             break;
         case LY_STMT_UNIQUE:
             switch (dev_mod) {
             case LYS_DEV_NOT_SUPPORTED:
             case LYS_DEV_REPLACE:
                 LOGVAL_PARSER(ctx, LY_VCODE_INDEV, ly_devmod2str(dev_mod), ly_stmt2str(kw));
                 return LY_EVALID;
             default:
                 LY_CHECK_RET(parse_qnames(ctx, LY_STMT_UNIQUE, d_uniques, Y_STR_ARG, &d->exts));
                 break;
             }
             break;
         case LY_STMT_UNITS:
             switch (dev_mod) {
             case LYS_DEV_NOT_SUPPORTED:
                 LOGVAL_PARSER(ctx, LY_VCODE_INDEV, ly_devmod2str(dev_mod), ly_stmt2str(kw));
                 return LY_EVALID;
             default:
                 LY_CHECK_RET(parse_text_field(ctx, LY_STMT_UNITS, 0, d_units, Y_STR_ARG, &d->exts));
                 break;
             }
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_DEVIATE, 0, &d->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "deviate");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the deviation statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] deviations Deviations to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_deviation(struct lys_yang_parser_ctx *ctx, struct lysp_deviation **deviations)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_deviation *dev;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *deviations, dev, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_STR_ARG, NULL, &word, &buf, &word_len));
     CHECK_NONEMPTY(ctx, word_len, "deviation");
     INSERT_WORD_RET(ctx, buf, dev->nodeid, word, word_len);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, goto checks, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &dev->dsc, Y_STR_ARG, &dev->exts));
             break;
         case LY_STMT_DEVIATE:
             LY_CHECK_RET(parse_deviate(ctx, &dev->deviates));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &dev->ref, Y_STR_ARG, &dev->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_DEVIATION, 0, &dev->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "deviation");
             return LY_EVALID;
         }
     }
     LY_CHECK_RET(ret);
 checks:
     /* mandatory substatements */
     if (!dev->deviates) {
         LOGVAL_PARSER(ctx, LY_VCODE_MISSTMT, "deviate", "deviation");
         return LY_EVALID;
     }

     return ret;
 }

 /**
  * @brief Parse the feature statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] features Features to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_feature(struct lys_yang_parser_ctx *ctx, struct lysp_feature **features)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_feature *feat;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *features, feat, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, feat->name, word, word_len);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &feat->dsc, Y_STR_ARG, &feat->exts));
             break;
         case LY_STMT_IF_FEATURE:
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &feat->iffeatures, Y_STR_ARG, &feat->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &feat->ref, Y_STR_ARG, &feat->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &feat->flags, &feat->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_FEATURE, 0, &feat->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "feature");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse the identity statement.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] identities Identities to add to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_identity(struct lys_yang_parser_ctx *ctx, struct lysp_ident **identities)
 {
     LY_ERR ret = LY_SUCCESS;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_ident *ident;

     LY_ARRAY_NEW_RET(PARSER_CTX(ctx), *identities, ident, LY_EMEM);

     /* get value */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, ident->name, word, word_len);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, return LY_SUCCESS, return ret) {
         switch (kw) {
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &ident->dsc, Y_STR_ARG, &ident->exts));
             break;
         case LY_STMT_IF_FEATURE:
             PARSER_CHECK_STMTVER2_RET(ctx, "if-feature", "identity");
             LY_CHECK_RET(parse_qnames(ctx, LY_STMT_IF_FEATURE, &ident->iffeatures, Y_STR_ARG, &ident->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &ident->ref, Y_STR_ARG, &ident->exts));
             break;
         case LY_STMT_STATUS:
             LY_CHECK_RET(parse_status(ctx, &ident->flags, &ident->exts));
             break;
         case LY_STMT_BASE:
             if (ident->bases && (ctx->parsed_mod->version < LYS_VERSION_1_1)) {
                 LOGVAL_PARSER(ctx, LYVE_SYNTAX_YANG, "Identity can be derived from multiple base identities only in YANG 1.1 modules");
                 return LY_EVALID;
             }
             LY_CHECK_RET(parse_text_fields(ctx, LY_STMT_BASE, &ident->bases, Y_PREF_IDENTIF_ARG, &ident->exts));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_IDENTITY, 0, &ident->exts));
             break;
         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "identity");
             return LY_EVALID;
         }
     }
     return ret;
 }

 /**
  * @brief Parse module substatements.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[in,out] mod Module to write to.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_module(struct lys_yang_parser_ctx *ctx, struct lysp_module *mod)
 {
     LY_ERR ret = 0;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw, prev_kw = 0;
     enum yang_module_stmt mod_stmt = Y_MOD_MODULE_HEADER;
     const struct lysp_submodule *dup;

     mod->is_submod = 0;

     /* module name */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, mod->mod->name, word, word_len);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, goto checks, return ret) {

 #define CHECK_ORDER(SECTION) \
         if (mod_stmt > SECTION) {LOGVAL_PARSER(ctx, LY_VCODE_INORD, ly_stmt2str(kw), ly_stmt2str(prev_kw)); return LY_EVALID;}mod_stmt = SECTION

         switch (kw) {
         /* module header */
         case LY_STMT_NAMESPACE:
         case LY_STMT_PREFIX:
             CHECK_ORDER(Y_MOD_MODULE_HEADER);
             break;
         case LY_STMT_YANG_VERSION:
             CHECK_ORDER(Y_MOD_MODULE_HEADER);
             break;
         /* linkage */
         case LY_STMT_INCLUDE:
         case LY_STMT_IMPORT:
             CHECK_ORDER(Y_MOD_LINKAGE);
             break;
         /* meta */
         case LY_STMT_ORGANIZATION:
         case LY_STMT_CONTACT:
         case LY_STMT_DESCRIPTION:
         case LY_STMT_REFERENCE:
             CHECK_ORDER(Y_MOD_META);
             break;

         /* revision */
         case LY_STMT_REVISION:
             CHECK_ORDER(Y_MOD_REVISION);
             break;
         /* body */
         case LY_STMT_ANYDATA:
         case LY_STMT_ANYXML:
         case LY_STMT_AUGMENT:
         case LY_STMT_CHOICE:
         case LY_STMT_CONTAINER:
         case LY_STMT_DEVIATION:
         case LY_STMT_EXTENSION:
         case LY_STMT_FEATURE:
         case LY_STMT_GROUPING:
         case LY_STMT_IDENTITY:
         case LY_STMT_LEAF:
         case LY_STMT_LEAF_LIST:
         case LY_STMT_LIST:
         case LY_STMT_NOTIFICATION:
         case LY_STMT_RPC:
         case LY_STMT_TYPEDEF:
         case LY_STMT_USES:
         case LY_STMT_EXTENSION_INSTANCE:
             mod_stmt = Y_MOD_BODY;
             break;
         default:
             /* error handled in the next switch */
             break;
         }
 #undef CHECK_ORDER

         prev_kw = kw;
         switch (kw) {
         /* module header */
         case LY_STMT_YANG_VERSION:
             LY_CHECK_RET(parse_yangversion(ctx, &mod->version, &mod->exts));
             break;
         case LY_STMT_NAMESPACE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_NAMESPACE, 0, &mod->mod->ns, Y_STR_ARG, &mod->exts));
             break;
         case LY_STMT_PREFIX:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_PREFIX, 0, &mod->mod->prefix, Y_IDENTIF_ARG, &mod->exts));
             break;

         /* linkage */
         case LY_STMT_INCLUDE:
             LY_CHECK_RET(parse_include(ctx, mod->mod->name, &mod->includes));
             break;
         case LY_STMT_IMPORT:
             LY_CHECK_RET(parse_import(ctx, mod->mod->prefix, &mod->imports));
             break;

         /* meta */
         case LY_STMT_ORGANIZATION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_ORGANIZATION, 0, &mod->mod->org, Y_STR_ARG, &mod->exts));
             break;
         case LY_STMT_CONTACT:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_CONTACT, 0, &mod->mod->contact, Y_STR_ARG, &mod->exts));
             break;
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &mod->mod->dsc, Y_STR_ARG, &mod->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &mod->mod->ref, Y_STR_ARG, &mod->exts));
             break;

         /* revision */
         case LY_STMT_REVISION:
             LY_CHECK_RET(parse_revision(ctx, &mod->revs));
             break;

         /* body */
         case LY_STMT_ANYDATA:
             PARSER_CHECK_STMTVER2_RET(ctx, "anydata", "module");
         /* fall through */
         case LY_STMT_ANYXML:
             LY_CHECK_RET(parse_any(ctx, kw, NULL, &mod->data));
             break;
         case LY_STMT_CHOICE:
             LY_CHECK_RET(parse_choice(ctx, NULL, &mod->data));
             break;
         case LY_STMT_CONTAINER:
             LY_CHECK_RET(parse_container(ctx, NULL, &mod->data));
             break;
         case LY_STMT_LEAF:
             LY_CHECK_RET(parse_leaf(ctx, NULL, &mod->data));
             break;
         case LY_STMT_LEAF_LIST:
             LY_CHECK_RET(parse_leaflist(ctx, NULL, &mod->data));
             break;
         case LY_STMT_LIST:
             LY_CHECK_RET(parse_list(ctx, NULL, &mod->data));
             break;
         case LY_STMT_USES:
             LY_CHECK_RET(parse_uses(ctx, NULL, &mod->data));
             break;

         case LY_STMT_AUGMENT:
             LY_CHECK_RET(parse_augment(ctx, NULL, &mod->augments));
             break;
         case LY_STMT_DEVIATION:
             LY_CHECK_RET(parse_deviation(ctx, &mod->deviations));
             break;
         case LY_STMT_EXTENSION:
             LY_CHECK_RET(parse_extension(ctx, &mod->extensions));
             break;
         case LY_STMT_FEATURE:
             LY_CHECK_RET(parse_feature(ctx, &mod->features));
             break;
         case LY_STMT_GROUPING:
             LY_CHECK_RET(parse_grouping(ctx, NULL, &mod->groupings));
             break;
         case LY_STMT_IDENTITY:
             LY_CHECK_RET(parse_identity(ctx, &mod->identities));
             break;
         case LY_STMT_NOTIFICATION:
             LY_CHECK_RET(parse_notif(ctx, NULL, &mod->notifs));
             break;
         case LY_STMT_RPC:
             LY_CHECK_RET(parse_action(ctx, NULL, &mod->rpcs));
             break;
         case LY_STMT_TYPEDEF:
             LY_CHECK_RET(parse_typedef(ctx, NULL, &mod->typedefs));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_MODULE, 0, &mod->exts));
             break;

         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "module");
             return LY_EVALID;
         }
     }
     LY_CHECK_RET(ret);

 checks:
     /* mandatory substatements */
     if (!mod->mod->ns) {
         LOGVAL_PARSER(ctx, LY_VCODE_MISSTMT, "namespace", "module");
         return LY_EVALID;
     } else if (!mod->mod->prefix) {
         LOGVAL_PARSER(ctx, LY_VCODE_MISSTMT, "prefix", "module");
         return LY_EVALID;
     }

     /* submodules share the namespace with the module names, so there must not be
      * a submodule of the same name in the context, no need for revision matching */
     dup = ly_ctx_get_submodule_latest(PARSER_CTX(ctx), mod->mod->name);
     if (dup) {
         LOGVAL_PARSER(ctx, LY_VCODE_NAME2_COL, "module", "submodule", mod->mod->name);
         return LY_EVALID;
     }

     return ret;
 }

 /**
  * @brief Parse submodule substatements.
  *
  * @param[in] ctx yang parser context for logging.
  * @param[out] submod Parsed submodule structure.
  *
  * @return LY_ERR values.
  */
 LY_ERR
 parse_submodule(struct lys_yang_parser_ctx *ctx, struct lysp_submodule *submod)
 {
     LY_ERR ret = 0;
     char *buf, *word;
     size_t word_len;
     enum ly_stmt kw, prev_kw = 0;
     enum yang_module_stmt mod_stmt = Y_MOD_MODULE_HEADER;
     const struct lysp_submodule *dup;

     submod->is_submod = 1;

     /* submodule name */
     LY_CHECK_RET(get_argument(ctx, Y_IDENTIF_ARG, NULL, &word, &buf, &word_len));
     INSERT_WORD_RET(ctx, buf, submod->name, word, word_len);

     YANG_READ_SUBSTMT_FOR(ctx, kw, word, word_len, ret, goto checks, return ret) {

 #define CHECK_ORDER(SECTION) \
         if (mod_stmt > SECTION) {LOGVAL_PARSER(ctx, LY_VCODE_INORD, ly_stmt2str(kw), ly_stmt2str(prev_kw)); return LY_EVALID;}mod_stmt = SECTION

         switch (kw) {
         /* module header */
         case LY_STMT_BELONGS_TO:
             CHECK_ORDER(Y_MOD_MODULE_HEADER);
             break;
         case LY_STMT_YANG_VERSION:
             CHECK_ORDER(Y_MOD_MODULE_HEADER);
             break;
         /* linkage */
         case LY_STMT_INCLUDE:
         case LY_STMT_IMPORT:
             CHECK_ORDER(Y_MOD_LINKAGE);
             break;
         /* meta */
         case LY_STMT_ORGANIZATION:
         case LY_STMT_CONTACT:
         case LY_STMT_DESCRIPTION:
         case LY_STMT_REFERENCE:
             CHECK_ORDER(Y_MOD_META);
             break;

         /* revision */
         case LY_STMT_REVISION:
             CHECK_ORDER(Y_MOD_REVISION);
             break;
         /* body */
         case LY_STMT_ANYDATA:
         case LY_STMT_ANYXML:
         case LY_STMT_AUGMENT:
         case LY_STMT_CHOICE:
         case LY_STMT_CONTAINER:
         case LY_STMT_DEVIATION:
         case LY_STMT_EXTENSION:
         case LY_STMT_FEATURE:
         case LY_STMT_GROUPING:
         case LY_STMT_IDENTITY:
         case LY_STMT_LEAF:
         case LY_STMT_LEAF_LIST:
         case LY_STMT_LIST:
         case LY_STMT_NOTIFICATION:
         case LY_STMT_RPC:
         case LY_STMT_TYPEDEF:
         case LY_STMT_USES:
         case LY_STMT_EXTENSION_INSTANCE:
             mod_stmt = Y_MOD_BODY;
             break;
         default:
             /* error handled in the next switch */
             break;
         }
 #undef CHECK_ORDER

         prev_kw = kw;
         switch (kw) {
         /* module header */
         case LY_STMT_YANG_VERSION:
             LY_CHECK_RET(parse_yangversion(ctx, &submod->version, &submod->exts));
             break;
         case LY_STMT_BELONGS_TO:
             LY_CHECK_RET(parse_belongsto(ctx, &submod->prefix, &submod->exts));
             break;

         /* linkage */
         case LY_STMT_INCLUDE:
             if (submod->version == LYS_VERSION_1_1) {
                 LOGWRN(PARSER_CTX(ctx), "YANG version 1.1 expects all includes in main module, includes in submodules (%s) are not necessary.",
                         submod->name);
             }
             LY_CHECK_RET(parse_include(ctx, submod->name, &submod->includes));
             break;
         case LY_STMT_IMPORT:
             LY_CHECK_RET(parse_import(ctx, submod->prefix, &submod->imports));
             break;

         /* meta */
         case LY_STMT_ORGANIZATION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_ORGANIZATION, 0, &submod->org, Y_STR_ARG, &submod->exts));
             break;
         case LY_STMT_CONTACT:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_CONTACT, 0, &submod->contact, Y_STR_ARG, &submod->exts));
             break;
         case LY_STMT_DESCRIPTION:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_DESCRIPTION, 0, &submod->dsc, Y_STR_ARG, &submod->exts));
             break;
         case LY_STMT_REFERENCE:
             LY_CHECK_RET(parse_text_field(ctx, LY_STMT_REFERENCE, 0, &submod->ref, Y_STR_ARG, &submod->exts));
             break;

         /* revision */
         case LY_STMT_REVISION:
             LY_CHECK_RET(parse_revision(ctx, &submod->revs));
             break;

         /* body */
         case LY_STMT_ANYDATA:
             PARSER_CHECK_STMTVER2_RET(ctx, "anydata", "submodule");
         /* fall through */
         case LY_STMT_ANYXML:
             LY_CHECK_RET(parse_any(ctx, kw, NULL, &submod->data));
             break;
         case LY_STMT_CHOICE:
             LY_CHECK_RET(parse_choice(ctx, NULL, &submod->data));
             break;
         case LY_STMT_CONTAINER:
             LY_CHECK_RET(parse_container(ctx, NULL, &submod->data));
             break;
         case LY_STMT_LEAF:
             LY_CHECK_RET(parse_leaf(ctx, NULL, &submod->data));
             break;
         case LY_STMT_LEAF_LIST:
             LY_CHECK_RET(parse_leaflist(ctx, NULL, &submod->data));
             break;
         case LY_STMT_LIST:
             LY_CHECK_RET(parse_list(ctx, NULL, &submod->data));
             break;
         case LY_STMT_USES:
             LY_CHECK_RET(parse_uses(ctx, NULL, &submod->data));
             break;

         case LY_STMT_AUGMENT:
             LY_CHECK_RET(parse_augment(ctx, NULL, &submod->augments));
             break;
         case LY_STMT_DEVIATION:
             LY_CHECK_RET(parse_deviation(ctx, &submod->deviations));
             break;
         case LY_STMT_EXTENSION:
             LY_CHECK_RET(parse_extension(ctx, &submod->extensions));
             break;
         case LY_STMT_FEATURE:
             LY_CHECK_RET(parse_feature(ctx, &submod->features));
             break;
         case LY_STMT_GROUPING:
             LY_CHECK_RET(parse_grouping(ctx, NULL, &submod->groupings));
             break;
         case LY_STMT_IDENTITY:
             LY_CHECK_RET(parse_identity(ctx, &submod->identities));
             break;
         case LY_STMT_NOTIFICATION:
             LY_CHECK_RET(parse_notif(ctx, NULL, &submod->notifs));
             break;
         case LY_STMT_RPC:
             LY_CHECK_RET(parse_action(ctx, NULL, &submod->rpcs));
             break;
         case LY_STMT_TYPEDEF:
             LY_CHECK_RET(parse_typedef(ctx, NULL, &submod->typedefs));
             break;
         case LY_STMT_EXTENSION_INSTANCE:
             LY_CHECK_RET(parse_ext(ctx, word, word_len, LY_STMT_SUBMODULE, 0, &submod->exts));
             break;

         default:
             LOGVAL_PARSER(ctx, LY_VCODE_INCHILDSTMT, ly_stmt2str(kw), "submodule");
             return LY_EVALID;
         }
     }
     LY_CHECK_RET(ret);

 checks:
     /* mandatory substatements */
     if (!submod->prefix) {
         LOGVAL_PARSER(ctx, LY_VCODE_MISSTMT, "belongs-to", "submodule");
         return LY_EVALID;
     }

     /* submodules share the namespace with the module names, so there must not be
      * a submodule of the same name in the context, no need for revision matching */
     dup = ly_ctx_get_submodule_latest(PARSER_CTX(ctx), submod->name);
     /* main modules may have different revisions */
     if (dup && strcmp(dup->mod->name, submod->mod->name)) {
         LOGVAL_PARSER(ctx, LY_VCODE_NAME_COL, "submodules", dup->name);
         return LY_EVALID;
     }

     return ret;
 }

 /**
  * @brief Skip any redundant characters, namely whitespaces and comments.
  *
  * @param[in] ctx Yang parser context.
  * @return LY_SUCCESS on success.
  * @return LY_EVALID on invalid comment.
  */
 static LY_ERR
 skip_redundant_chars(struct lys_yang_parser_ctx *ctx)
 {
     /* read some trailing spaces, new lines, or comments */
     while (ctx->in->current[0]) {
         if (!strncmp(ctx->in->current, "//", 2)) {
             /* one-line comment */
             ly_in_skip(ctx->in, 2);
             LY_CHECK_RET(skip_comment(ctx, 1));
         } else if (!strncmp(ctx->in->current, "/*", 2)) {
             /* block comment */
             ly_in_skip(ctx->in, 2);
             LY_CHECK_RET(skip_comment(ctx, 2));
         } else if (isspace(ctx->in->current[0])) {
             /* whitespace */
             if (ctx->in->current[0] == '\n') {
                 LY_IN_NEW_LINE(ctx->in);
             }
             ly_in_skip(ctx->in, 1);
         } else {
             break;
         }
     }

     return LY_SUCCESS;
 }

 LY_ERR
 yang_parse_submodule(struct lys_yang_parser_ctx **context, struct ly_ctx *ly_ctx, struct lys_parser_ctx *main_ctx,
         struct ly_in *in, struct lysp_submodule **submod)
 {
     LY_ERR ret = LY_SUCCESS;
     char *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_submodule *mod_p = NULL;

     /* create context */
     *context = calloc(1, sizeof **context);
     LY_CHECK_ERR_RET(!(*context), LOGMEM(ly_ctx), LY_EMEM);
     (*context)->format = LYS_IN_YANG;
     (*context)->unres = main_ctx->unres;
     (*context)->in = in;

     mod_p = calloc(1, sizeof *mod_p);
     LY_CHECK_ERR_GOTO(!mod_p, LOGMEM(ly_ctx); ret = LY_EMEM, cleanup);
     mod_p->mod = main_ctx->parsed_mod->mod;
     mod_p->parsing = 1;
     (*context)->parsed_mod = (struct lysp_module *)mod_p;

     LOG_LOCINIT(NULL, NULL, NULL, in);

     /* map the typedefs and groupings list from main context to the submodule's context */
     memcpy(&(*context)->tpdfs_nodes, &main_ctx->tpdfs_nodes, sizeof main_ctx->tpdfs_nodes);
     memcpy(&(*context)->grps_nodes, &main_ctx->grps_nodes, sizeof main_ctx->grps_nodes);

     /* skip redundant but valid characters at the beginning */
     ret = skip_redundant_chars(*context);
     LY_CHECK_GOTO(ret, cleanup);

     /* "module"/"submodule" */
     ret = get_keyword(*context, &kw, &word, &word_len);
     LY_CHECK_GOTO(ret, cleanup);

     if (kw == LY_STMT_MODULE) {
         LOGERR(ly_ctx, LY_EDENIED, "Input data contains module in situation when a submodule is expected.");
         ret = LY_EINVAL;
         goto cleanup;
     } else if (kw != LY_STMT_SUBMODULE) {
         LOGVAL_PARSER(*context, LY_VCODE_MOD_SUBOMD, ly_stmt2str(kw));
         ret = LY_EVALID;
         goto cleanup;
     }

     /* substatements */
     ret = parse_submodule(*context, mod_p);
     LY_CHECK_GOTO(ret, cleanup);

     /* skip redundant but valid characters at the end */
     ret = skip_redundant_chars(*context);
     LY_CHECK_GOTO(ret, cleanup);
     if (in->current[0]) {
         LOGVAL_PARSER(*context, LY_VCODE_TRAILING_SUBMOD, 15, in->current, strlen(in->current) > 15 ? "..." : "");
         ret = LY_EVALID;
         goto cleanup;
     }

     mod_p->parsing = 0;
     *submod = mod_p;

 cleanup:
     LOG_LOCBACK(0, 0, 0, 1);
     if (ret) {
         lysp_module_free((struct lysp_module *)mod_p);
         yang_parser_ctx_free(*context);
         *context = NULL;
     }

     return ret;
 }

 LY_ERR
 yang_parse_module(struct lys_yang_parser_ctx **context, struct ly_in *in, struct lys_module *mod, struct lys_glob_unres *unres)
 {
     LY_ERR ret = LY_SUCCESS;
     char *word;
     size_t word_len;
     enum ly_stmt kw;
     struct lysp_module *mod_p = NULL;

     /* create context */
     *context = calloc(1, sizeof **context);
     LY_CHECK_ERR_RET(!(*context), LOGMEM(mod->ctx), LY_EMEM);
     (*context)->format = LYS_IN_YANG;
     (*context)->unres = unres;
     (*context)->in = in;

     mod_p = calloc(1, sizeof *mod_p);
     LY_CHECK_ERR_GOTO(!mod_p, LOGMEM(mod->ctx), cleanup);
     mod_p->mod = mod;
     mod_p->parsing = 1;
     (*context)->parsed_mod = mod_p;

     LOG_LOCINIT(NULL, NULL, NULL, in);

     /* skip redundant but valid characters at the beginning */
     ret = skip_redundant_chars(*context);
     LY_CHECK_GOTO(ret, cleanup);

     /* "module"/"submodule" */
     ret = get_keyword(*context, &kw, &word, &word_len);
     LY_CHECK_GOTO(ret, cleanup);

     if (kw == LY_STMT_SUBMODULE) {
         LOGERR(mod->ctx, LY_EDENIED, "Input data contains submodule which cannot be parsed directly without its main module.");
         ret = LY_EINVAL;
         goto cleanup;
     } else if (kw != LY_STMT_MODULE) {
         LOGVAL_PARSER((*context), LY_VCODE_MOD_SUBOMD, ly_stmt2str(kw));
         ret = LY_EVALID;
         goto cleanup;
     }

     /* substatements */
     ret = parse_module(*context, mod_p);
     LY_CHECK_GOTO(ret, cleanup);

     /* skip redundant but valid characters at the end */
     ret = skip_redundant_chars(*context);
     LY_CHECK_GOTO(ret, cleanup);
     if (in->current[0]) {
         LOGVAL_PARSER(*context, LY_VCODE_TRAILING_MOD, 15, in->current, strlen(in->current) > 15 ? "..." : "");
         ret = LY_EVALID;
         goto cleanup;
     }

     mod_p->parsing = 0;
     mod->parsed = mod_p;

 cleanup:
     LOG_LOCBACK(0, 0, 0, 1);
     if (ret) {
         lysp_module_free(mod_p);
         yang_parser_ctx_free(*context);
         *context = NULL;
     }

     return ret;
 }