6 * The following notes assume that you are familiar with the YAML specification
7 * (http://yaml.org/spec/cvs/current.html). We mostly follow it, although in
8 * some cases we are less restrictive that it requires.
10 * The process of transforming a YAML stream into a sequence of events is
11 * divided on two steps: Scanning and Parsing.
13 * The Scanner transforms the input stream into a sequence of tokens, while the
14 * parser transform the sequence of tokens produced by the Scanner into a
15 * sequence of parsing events.
17 * The Scanner is rather clever and complicated. The Parser, on the contrary,
18 * is a straightforward implementation of a recursive-descendant parser (or,
19 * LL(1) parser, as it is usually called).
21 * Actually there are two issues of Scanning that might be called "clever", the
22 * rest is quite straightforward. The issues are "block collection start" and
23 * "simple keys". Both issues are explained below in details.
25 * Here the Scanning step is explained and implemented. We start with the list
26 * of all the tokens produced by the Scanner together with short descriptions.
30 * STREAM-START(encoding) # The stream start.
31 * STREAM-END # The stream end.
32 * VERSION-DIRECTIVE(major,minor) # The '%YAML' directive.
33 * TAG-DIRECTIVE(handle,prefix) # The '%TAG' directive.
34 * DOCUMENT-START # '---'
35 * DOCUMENT-END # '...'
36 * BLOCK-SEQUENCE-START # Indentation increase denoting a block
37 * BLOCK-MAPPING-START # sequence or a block mapping.
38 * BLOCK-END # Indentation decrease.
39 * FLOW-SEQUENCE-START # '['
40 * FLOW-SEQUENCE-END # ']'
41 * BLOCK-SEQUENCE-START # '{'
42 * BLOCK-SEQUENCE-END # '}'
45 * KEY # '?' or nothing (simple keys).
47 * ALIAS(anchor) # '*anchor'
48 * ANCHOR(anchor) # '&anchor'
49 * TAG(handle,suffix) # '!handle!suffix'
50 * SCALAR(value,style) # A scalar.
52 * The following two tokens are "virtual" tokens denoting the beginning and the
55 * STREAM-START(encoding)
58 * We pass the information about the input stream encoding with the
61 * The next two tokens are responsible for tags:
63 * VERSION-DIRECTIVE(major,minor)
64 * TAG-DIRECTIVE(handle,prefix)
70 * %TAG !yaml! tag:yaml.org,2002:
73 * The correspoding sequence of tokens:
76 * VERSION-DIRECTIVE(1,1)
77 * TAG-DIRECTIVE("!","!foo")
78 * TAG-DIRECTIVE("!yaml","tag:yaml.org,2002:")
82 * Note that the VERSION-DIRECTIVE and TAG-DIRECTIVE tokens occupy a whole
85 * The document start and end indicators are represented by:
90 * Note that if a YAML stream contains an implicit document (without '---'
91 * and '...' indicators), no DOCUMENT-START and DOCUMENT-END tokens will be
94 * In the following examples, we present whole documents together with the
97 * 1. An implicit document:
103 * STREAM-START(utf-8)
104 * SCALAR("a scalar",single-quoted)
107 * 2. An explicit document:
115 * STREAM-START(utf-8)
117 * SCALAR("a scalar",single-quoted)
121 * 3. Several documents in a stream:
127 * 'yet another scalar'
131 * STREAM-START(utf-8)
132 * SCALAR("a scalar",single-quoted)
134 * SCALAR("another scalar",single-quoted)
136 * SCALAR("yet another scalar",single-quoted)
139 * We have already introduced the SCALAR token above. The following tokens are
140 * used to describe aliases, anchors, tag, and scalars:
145 * SCALAR(value,style)
147 * The following series of examples illustrate the usage of these tokens:
149 * 1. A recursive sequence:
155 * STREAM-START(utf-8)
157 * FLOW-SEQUENCE-START
162 * 2. A tagged scalar:
164 * !!float "3.14" # A good approximation.
168 * STREAM-START(utf-8)
170 * SCALAR("3.14",double-quoted)
173 * 3. Various scalar styles:
175 * --- # Implicit empty plain scalars do not produce tokens.
177 * --- 'a single-quoted scalar'
178 * --- "a double-quoted scalar"
187 * STREAM-START(utf-8)
190 * SCALAR("a plain scalar",plain)
192 * SCALAR("a single-quoted scalar",single-quoted)
194 * SCALAR("a double-quoted scalar",double-quoted)
196 * SCALAR("a literal scalar",literal)
198 * SCALAR("a folded scalar",folded)
201 * Now it's time to review collection-related tokens. We will start with
204 * FLOW-SEQUENCE-START
212 * The tokens FLOW-SEQUENCE-START, FLOW-SEQUENCE-END, FLOW-MAPPING-START, and
213 * FLOW-MAPPING-END represent the indicators '[', ']', '{', and '}'
214 * correspondingly. FLOW-ENTRY represent the ',' indicator. Finally the
215 * indicators '?' and ':', which are used for denoting mapping keys and values,
216 * are represented by the KEY and VALUE tokens.
218 * The following examples show flow collections:
220 * 1. A flow sequence:
222 * [item 1, item 2, item 3]
226 * STREAM-START(utf-8)
227 * FLOW-SEQUENCE-START
228 * SCALAR("item 1",plain)
230 * SCALAR("item 2",plain)
232 * SCALAR("item 3",plain)
239 * a simple key: a value, # Note that the KEY token is produced.
240 * ? a complex key: another value,
245 * STREAM-START(utf-8)
248 * SCALAR("a simple key",plain)
250 * SCALAR("a value",plain)
253 * SCALAR("a complex key",plain)
255 * SCALAR("another value",plain)
260 * A simple key is a key which is not denoted by the '?' indicator. Note that
261 * the Scanner still produce the KEY token whenever it encounters a simple key.
263 * For scanning block collections, the following tokens are used (note that we
264 * repeat KEY and VALUE here):
266 * BLOCK-SEQUENCE-START
267 * BLOCK-MAPPING-START
273 * The tokens BLOCK-SEQUENCE-START and BLOCK-MAPPING-START denote indentation
274 * increase that precedes a block collection (cf. the INDENT token in Python).
275 * The token BLOCK-END denote indentation decrease that ends a block collection
276 * (cf. the DEDENT token in Python). However YAML has some syntax pecularities
277 * that makes detections of these tokens more complex.
279 * The tokens BLOCK-ENTRY, KEY, and VALUE are used to represent the indicators
280 * '-', '?', and ':' correspondingly.
282 * The following examples show how the tokens BLOCK-SEQUENCE-START,
283 * BLOCK-MAPPING-START, and BLOCK-END are emitted by the Scanner:
285 * 1. Block sequences:
298 * STREAM-START(utf-8)
299 * BLOCK-SEQUENCE-START
301 * SCALAR("item 1",plain)
303 * SCALAR("item 2",plain)
305 * BLOCK-SEQUENCE-START
307 * SCALAR("item 3.1",plain)
309 * SCALAR("item 3.2",plain)
312 * BLOCK-MAPPING-START
314 * SCALAR("key 1",plain)
316 * SCALAR("value 1",plain)
318 * SCALAR("key 2",plain)
320 * SCALAR("value 2",plain)
327 * a simple key: a value # The KEY token is produced here.
339 * STREAM-START(utf-8)
340 * BLOCK-MAPPING-START
342 * SCALAR("a simple key",plain)
344 * SCALAR("a value",plain)
346 * SCALAR("a complex key",plain)
348 * SCALAR("another value",plain)
350 * SCALAR("a mapping",plain)
351 * BLOCK-MAPPING-START
353 * SCALAR("key 1",plain)
355 * SCALAR("value 1",plain)
357 * SCALAR("key 2",plain)
359 * SCALAR("value 2",plain)
362 * SCALAR("a sequence",plain)
364 * BLOCK-SEQUENCE-START
366 * SCALAR("item 1",plain)
368 * SCALAR("item 2",plain)
373 * YAML does not always require to start a new block collection from a new
374 * line. If the current line contains only '-', '?', and ':' indicators, a new
375 * block collection may start at the current line. The following examples
376 * illustrate this case:
378 * 1. Collections in a sequence:
389 * STREAM-START(utf-8)
390 * BLOCK-SEQUENCE-START
392 * BLOCK-SEQUENCE-START
394 * SCALAR("item 1",plain)
396 * SCALAR("item 2",plain)
399 * BLOCK-MAPPING-START
401 * SCALAR("key 1",plain)
403 * SCALAR("value 1",plain)
405 * SCALAR("key 2",plain)
407 * SCALAR("value 2",plain)
410 * BLOCK-MAPPING-START
412 * SCALAR("complex key")
414 * SCALAR("complex value")
419 * 2. Collections in a mapping:
430 * STREAM-START(utf-8)
431 * BLOCK-MAPPING-START
433 * SCALAR("a sequence",plain)
435 * BLOCK-SEQUENCE-START
437 * SCALAR("item 1",plain)
439 * SCALAR("item 2",plain)
442 * SCALAR("a mapping",plain)
444 * BLOCK-MAPPING-START
446 * SCALAR("key 1",plain)
448 * SCALAR("value 1",plain)
450 * SCALAR("key 2",plain)
452 * SCALAR("value 2",plain)
457 * YAML also permits non-indented sequences if they are included into a block
458 * mapping. In this case, the token BLOCK-SEQUENCE-START is not produced:
461 * - item 1 # BLOCK-SEQUENCE-START is NOT produced here.
466 * STREAM-START(utf-8)
467 * BLOCK-MAPPING-START
469 * SCALAR("key",plain)
472 * SCALAR("item 1",plain)
474 * SCALAR("item 2",plain)
478 #include "yaml_private.h"
481 * Ensure that the buffer contains the required number of characters.
482 * Return 1 on success, 0 on failure (reader error or memory error).
485 #define CACHE(parser,length) \
486 (parser->unread >= (length) \
488 : yaml_parser_update_buffer(parser, (length)))
491 * Advance the buffer pointer.
494 #define SKIP(parser) \
495 (parser->mark.index ++, \
496 parser->mark.column ++, \
498 parser->buffer.pointer += WIDTH(parser->buffer))
500 #define SKIP_LINE(parser) \
501 (IS_CRLF(parser->buffer) ? \
502 (parser->mark.index += 2, \
503 parser->mark.column = 0, \
504 parser->mark.line ++, \
505 parser->unread -= 2, \
506 parser->buffer.pointer += 2) : \
507 IS_BREAK(parser->buffer) ? \
508 (parser->mark.index ++, \
509 parser->mark.column = 0, \
510 parser->mark.line ++, \
512 parser->buffer.pointer += WIDTH(parser->buffer)) : 0)
515 * Copy a character to a string buffer and advance pointers.
518 #define READ(parser,string) \
519 (STRING_EXTEND(parser,string) ? \
520 (COPY(string,parser->buffer), \
521 parser->mark.index ++, \
522 parser->mark.column ++, \
527 * Copy a line break character to a string buffer and advance pointers.
530 #define READ_LINE(parser,string) \
531 (STRING_EXTEND(parser,string) ? \
532 (((CHECK_AT(parser->buffer,'\r',0) \
533 && CHECK_AT(parser->buffer,'\n',1)) ? /* CR LF -> LF */ \
534 (*((string).pointer++) = (yaml_char_t) '\n', \
535 parser->buffer.pointer += 2, \
536 parser->mark.index += 2, \
537 parser->mark.column = 0, \
538 parser->mark.line ++, \
539 parser->unread -= 2) : \
540 (CHECK_AT(parser->buffer,'\r',0) \
541 || CHECK_AT(parser->buffer,'\n',0)) ? /* CR|LF -> LF */ \
542 (*((string).pointer++) = (yaml_char_t) '\n', \
543 parser->buffer.pointer ++, \
544 parser->mark.index ++, \
545 parser->mark.column = 0, \
546 parser->mark.line ++, \
547 parser->unread --) : \
548 (CHECK_AT(parser->buffer,'\xC2',0) \
549 && CHECK_AT(parser->buffer,'\x85',1)) ? /* NEL -> LF */ \
550 (*((string).pointer++) = (yaml_char_t) '\n', \
551 parser->buffer.pointer += 2, \
552 parser->mark.index ++, \
553 parser->mark.column = 0, \
554 parser->mark.line ++, \
555 parser->unread --) : \
556 (CHECK_AT(parser->buffer,'\xE2',0) && \
557 CHECK_AT(parser->buffer,'\x80',1) && \
558 (CHECK_AT(parser->buffer,'\xA8',2) || \
559 CHECK_AT(parser->buffer,'\xA9',2))) ? /* LS|PS -> LS|PS */ \
560 (*((string).pointer++) = *(parser->buffer.pointer++), \
561 *((string).pointer++) = *(parser->buffer.pointer++), \
562 *((string).pointer++) = *(parser->buffer.pointer++), \
563 parser->mark.index ++, \
564 parser->mark.column = 0, \
565 parser->mark.line ++, \
566 parser->unread --) : 0), \
570 * Public API declarations.
574 yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token);
581 yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context,
582 yaml_mark_t context_mark, const char *problem);
585 * High-level token API.
589 yaml_parser_fetch_more_tokens(yaml_parser_t *parser);
592 yaml_parser_fetch_next_token(yaml_parser_t *parser);
595 * Potential simple keys.
599 yaml_parser_stale_simple_keys(yaml_parser_t *parser);
602 yaml_parser_save_simple_key(yaml_parser_t *parser);
605 yaml_parser_remove_simple_key(yaml_parser_t *parser);
608 yaml_parser_increase_flow_level(yaml_parser_t *parser);
611 yaml_parser_decrease_flow_level(yaml_parser_t *parser);
614 * Indentation treatment.
618 yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column,
619 ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark);
622 yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column);
629 yaml_parser_fetch_stream_start(yaml_parser_t *parser);
632 yaml_parser_fetch_stream_end(yaml_parser_t *parser);
635 yaml_parser_fetch_directive(yaml_parser_t *parser);
638 yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
639 yaml_token_type_t type);
642 yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
643 yaml_token_type_t type);
646 yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
647 yaml_token_type_t type);
650 yaml_parser_fetch_flow_entry(yaml_parser_t *parser);
653 yaml_parser_fetch_block_entry(yaml_parser_t *parser);
656 yaml_parser_fetch_key(yaml_parser_t *parser);
659 yaml_parser_fetch_value(yaml_parser_t *parser);
662 yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type);
665 yaml_parser_fetch_tag(yaml_parser_t *parser);
668 yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal);
671 yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single);
674 yaml_parser_fetch_plain_scalar(yaml_parser_t *parser);
681 yaml_parser_scan_to_next_token(yaml_parser_t *parser);
684 yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token);
687 yaml_parser_scan_directive_name(yaml_parser_t *parser,
688 yaml_mark_t start_mark, yaml_char_t **name);
691 yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
692 yaml_mark_t start_mark, int *major, int *minor);
695 yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
696 yaml_mark_t start_mark, int *number);
699 yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
700 yaml_mark_t mark, yaml_char_t **handle, yaml_char_t **prefix);
703 yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
704 yaml_token_type_t type);
707 yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token);
710 yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
711 yaml_mark_t start_mark, yaml_char_t **handle);
714 yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive,
715 yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri);
718 yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
719 yaml_mark_t start_mark, yaml_string_t *string);
722 yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
726 yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser,
727 int *indent, yaml_string_t *breaks,
728 yaml_mark_t start_mark, yaml_mark_t *end_mark);
731 yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
735 yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token);
738 * Get the next token.
742 yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token)
744 assert(parser); /* Non-NULL parser object is expected. */
745 assert(token); /* Non-NULL token object is expected. */
747 /* Erase the token object. */
749 memset(token, 0, sizeof(yaml_token_t));
751 /* No tokens after STREAM-END or error. */
753 if (parser->stream_end_produced || parser->error) {
757 /* Ensure that the tokens queue contains enough tokens. */
759 if (!parser->token_available) {
760 if (!yaml_parser_fetch_more_tokens(parser))
764 /* Fetch the next token from the queue. */
766 *token = DEQUEUE(parser, parser->tokens);
767 parser->token_available = 0;
768 parser->tokens_parsed ++;
770 if (token->type == YAML_STREAM_END_TOKEN) {
771 parser->stream_end_produced = 1;
778 * Set the scanner error and return 0.
782 yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context,
783 yaml_mark_t context_mark, const char *problem)
785 parser->error = YAML_SCANNER_ERROR;
786 parser->context = context;
787 parser->context_mark = context_mark;
788 parser->problem = problem;
789 parser->problem_mark = parser->mark;
795 * Ensure that the tokens queue contains at least one token which can be
796 * returned to the Parser.
800 yaml_parser_fetch_more_tokens(yaml_parser_t *parser)
802 int need_more_tokens;
804 /* While we need more tokens to fetch, do it. */
809 * Check if we really need to fetch more tokens.
812 need_more_tokens = 0;
814 if (parser->tokens.head == parser->tokens.tail)
816 /* Queue is empty. */
818 need_more_tokens = 1;
822 yaml_simple_key_t *simple_key;
824 /* Check if any potential simple key may occupy the head position. */
826 if (!yaml_parser_stale_simple_keys(parser))
829 for (simple_key = parser->simple_keys.start;
830 simple_key != parser->simple_keys.top; simple_key++) {
831 if (simple_key->possible
832 && simple_key->token_number == parser->tokens_parsed) {
833 need_more_tokens = 1;
839 /* We are finished. */
841 if (!need_more_tokens)
844 /* Fetch the next token. */
846 if (!yaml_parser_fetch_next_token(parser))
850 parser->token_available = 1;
856 * The dispatcher for token fetchers.
860 yaml_parser_fetch_next_token(yaml_parser_t *parser)
862 /* Ensure that the buffer is initialized. */
864 if (!CACHE(parser, 1))
867 /* Check if we just started scanning. Fetch STREAM-START then. */
869 if (!parser->stream_start_produced)
870 return yaml_parser_fetch_stream_start(parser);
872 /* Eat whitespaces and comments until we reach the next token. */
874 if (!yaml_parser_scan_to_next_token(parser))
877 /* Remove obsolete potential simple keys. */
879 if (!yaml_parser_stale_simple_keys(parser))
882 /* Check the indentation level against the current column. */
884 if (!yaml_parser_unroll_indent(parser, parser->mark.column))
888 * Ensure that the buffer contains at least 4 characters. 4 is the length
889 * of the longest indicators ('--- ' and '... ').
892 if (!CACHE(parser, 4))
895 /* Is it the end of the stream? */
897 if (IS_Z(parser->buffer))
898 return yaml_parser_fetch_stream_end(parser);
900 /* Is it a directive? */
902 if (parser->mark.column == 0 && CHECK(parser->buffer, '%'))
903 return yaml_parser_fetch_directive(parser);
905 /* Is it the document start indicator? */
907 if (parser->mark.column == 0
908 && CHECK_AT(parser->buffer, '-', 0)
909 && CHECK_AT(parser->buffer, '-', 1)
910 && CHECK_AT(parser->buffer, '-', 2)
911 && IS_BLANKZ_AT(parser->buffer, 3))
912 return yaml_parser_fetch_document_indicator(parser,
913 YAML_DOCUMENT_START_TOKEN);
915 /* Is it the document end indicator? */
917 if (parser->mark.column == 0
918 && CHECK_AT(parser->buffer, '.', 0)
919 && CHECK_AT(parser->buffer, '.', 1)
920 && CHECK_AT(parser->buffer, '.', 2)
921 && IS_BLANKZ_AT(parser->buffer, 3))
922 return yaml_parser_fetch_document_indicator(parser,
923 YAML_DOCUMENT_END_TOKEN);
925 /* Is it the flow sequence start indicator? */
927 if (CHECK(parser->buffer, '['))
928 return yaml_parser_fetch_flow_collection_start(parser,
929 YAML_FLOW_SEQUENCE_START_TOKEN);
931 /* Is it the flow mapping start indicator? */
933 if (CHECK(parser->buffer, '{'))
934 return yaml_parser_fetch_flow_collection_start(parser,
935 YAML_FLOW_MAPPING_START_TOKEN);
937 /* Is it the flow sequence end indicator? */
939 if (CHECK(parser->buffer, ']'))
940 return yaml_parser_fetch_flow_collection_end(parser,
941 YAML_FLOW_SEQUENCE_END_TOKEN);
943 /* Is it the flow mapping end indicator? */
945 if (CHECK(parser->buffer, '}'))
946 return yaml_parser_fetch_flow_collection_end(parser,
947 YAML_FLOW_MAPPING_END_TOKEN);
949 /* Is it the flow entry indicator? */
951 if (CHECK(parser->buffer, ','))
952 return yaml_parser_fetch_flow_entry(parser);
954 /* Is it the block entry indicator? */
956 if (CHECK(parser->buffer, '-') && IS_BLANKZ_AT(parser->buffer, 1))
957 return yaml_parser_fetch_block_entry(parser);
959 /* Is it the key indicator? */
961 if (CHECK(parser->buffer, '?')
962 && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1)))
963 return yaml_parser_fetch_key(parser);
965 /* Is it the value indicator? */
967 if (CHECK(parser->buffer, ':')
968 && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1)))
969 return yaml_parser_fetch_value(parser);
971 /* Is it an alias? */
973 if (CHECK(parser->buffer, '*'))
974 return yaml_parser_fetch_anchor(parser, YAML_ALIAS_TOKEN);
976 /* Is it an anchor? */
978 if (CHECK(parser->buffer, '&'))
979 return yaml_parser_fetch_anchor(parser, YAML_ANCHOR_TOKEN);
983 if (CHECK(parser->buffer, '!'))
984 return yaml_parser_fetch_tag(parser);
986 /* Is it a literal scalar? */
988 if (CHECK(parser->buffer, '|') && !parser->flow_level)
989 return yaml_parser_fetch_block_scalar(parser, 1);
991 /* Is it a folded scalar? */
993 if (CHECK(parser->buffer, '>') && !parser->flow_level)
994 return yaml_parser_fetch_block_scalar(parser, 0);
996 /* Is it a single-quoted scalar? */
998 if (CHECK(parser->buffer, '\''))
999 return yaml_parser_fetch_flow_scalar(parser, 1);
1001 /* Is it a double-quoted scalar? */
1003 if (CHECK(parser->buffer, '"'))
1004 return yaml_parser_fetch_flow_scalar(parser, 0);
1007 * Is it a plain scalar?
1009 * A plain scalar may start with any non-blank characters except
1011 * '-', '?', ':', ',', '[', ']', '{', '}',
1012 * '#', '&', '*', '!', '|', '>', '\'', '\"',
1015 * In the block context (and, for the '-' indicator, in the flow context
1016 * too), it may also start with the characters
1020 * if it is followed by a non-space character.
1022 * The last rule is more restrictive than the specification requires.
1025 if (!(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '-')
1026 || CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':')
1027 || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '[')
1028 || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{')
1029 || CHECK(parser->buffer, '}') || CHECK(parser->buffer, '#')
1030 || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '*')
1031 || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '|')
1032 || CHECK(parser->buffer, '>') || CHECK(parser->buffer, '\'')
1033 || CHECK(parser->buffer, '"') || CHECK(parser->buffer, '%')
1034 || CHECK(parser->buffer, '@') || CHECK(parser->buffer, '`')) ||
1035 (CHECK(parser->buffer, '-') && !IS_BLANK_AT(parser->buffer, 1)) ||
1036 (!parser->flow_level &&
1037 (CHECK(parser->buffer, '?') || CHECK(parser->buffer, ':'))
1038 && !IS_BLANKZ_AT(parser->buffer, 1)))
1039 return yaml_parser_fetch_plain_scalar(parser);
1042 * If we don't determine the token type so far, it is an error.
1045 return yaml_parser_set_scanner_error(parser,
1046 "while scanning for the next token", parser->mark,
1047 "found character that cannot start any token");
1051 * Check the list of potential simple keys and remove the positions that
1052 * cannot contain simple keys anymore.
1056 yaml_parser_stale_simple_keys(yaml_parser_t *parser)
1058 yaml_simple_key_t *simple_key;
1060 /* Check for a potential simple key for each flow level. */
1062 for (simple_key = parser->simple_keys.start;
1063 simple_key != parser->simple_keys.top; simple_key ++)
1066 * The specification requires that a simple key
1068 * - is limited to a single line,
1069 * - is shorter than 1024 characters.
1072 if (simple_key->possible
1073 && (simple_key->mark.line < parser->mark.line
1074 || simple_key->mark.index+1024 < parser->mark.index)) {
1076 /* Check if the potential simple key to be removed is required. */
1078 if (simple_key->required) {
1079 return yaml_parser_set_scanner_error(parser,
1080 "while scanning a simple key", simple_key->mark,
1081 "could not find expected ':'");
1084 simple_key->possible = 0;
1092 * Check if a simple key may start at the current position and add it if
1097 yaml_parser_save_simple_key(yaml_parser_t *parser)
1100 * A simple key is required at the current position if the scanner is in
1101 * the block context and the current column coincides with the indentation
1105 int required = (!parser->flow_level
1106 && parser->indent == (ptrdiff_t)parser->mark.column);
1109 * A simple key is required only when it is the first token in the current
1110 * line. Therefore it is always allowed. But we add a check anyway.
1113 assert(parser->simple_key_allowed || !required); /* Impossible. */
1116 * If the current position may start a simple key, save it.
1119 if (parser->simple_key_allowed)
1121 yaml_simple_key_t simple_key;
1122 simple_key.possible = 1;
1123 simple_key.required = required;
1124 simple_key.token_number =
1125 parser->tokens_parsed + (parser->tokens.tail - parser->tokens.head);
1126 simple_key.mark = parser->mark;
1128 if (!yaml_parser_remove_simple_key(parser)) return 0;
1130 *(parser->simple_keys.top-1) = simple_key;
1137 * Remove a potential simple key at the current flow level.
1141 yaml_parser_remove_simple_key(yaml_parser_t *parser)
1143 yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
1145 if (simple_key->possible)
1147 /* If the key is required, it is an error. */
1149 if (simple_key->required) {
1150 return yaml_parser_set_scanner_error(parser,
1151 "while scanning a simple key", simple_key->mark,
1152 "could not find expected ':'");
1156 /* Remove the key from the stack. */
1158 simple_key->possible = 0;
1164 * Increase the flow level and resize the simple key list if needed.
1168 yaml_parser_increase_flow_level(yaml_parser_t *parser)
1170 yaml_simple_key_t empty_simple_key = { 0, 0, 0, { 0, 0, 0 } };
1172 /* Reset the simple key on the next level. */
1174 if (!PUSH(parser, parser->simple_keys, empty_simple_key))
1177 /* Increase the flow level. */
1179 if (parser->flow_level == INT_MAX) {
1180 parser->error = YAML_MEMORY_ERROR;
1184 parser->flow_level++;
1190 * Decrease the flow level.
1194 yaml_parser_decrease_flow_level(yaml_parser_t *parser)
1196 yaml_simple_key_t dummy_key; /* Used to eliminate a compiler warning. */
1198 if (parser->flow_level) {
1199 parser->flow_level --;
1200 dummy_key = POP(parser, parser->simple_keys);
1207 * Push the current indentation level to the stack and set the new level
1208 * the current column is greater than the indentation level. In this case,
1209 * append or insert the specified token into the token queue.
1214 yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column,
1215 ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark)
1219 /* In the flow context, do nothing. */
1221 if (parser->flow_level)
1224 if (parser->indent < column)
1227 * Push the current indentation level to the stack and set the new
1228 * indentation level.
1231 if (!PUSH(parser, parser->indents, parser->indent))
1234 if (column > INT_MAX) {
1235 parser->error = YAML_MEMORY_ERROR;
1239 parser->indent = column;
1241 /* Create a token and insert it into the queue. */
1243 TOKEN_INIT(token, type, mark, mark);
1246 if (!ENQUEUE(parser, parser->tokens, token))
1250 if (!QUEUE_INSERT(parser,
1251 parser->tokens, number - parser->tokens_parsed, token))
1260 * Pop indentation levels from the indents stack until the current level
1261 * becomes less or equal to the column. For each intendation level, append
1262 * the BLOCK-END token.
1267 yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column)
1271 /* In the flow context, do nothing. */
1273 if (parser->flow_level)
1276 /* Loop through the intendation levels in the stack. */
1278 while (parser->indent > column)
1280 /* Create a token and append it to the queue. */
1282 TOKEN_INIT(token, YAML_BLOCK_END_TOKEN, parser->mark, parser->mark);
1284 if (!ENQUEUE(parser, parser->tokens, token))
1287 /* Pop the indentation level. */
1289 parser->indent = POP(parser, parser->indents);
1296 * Initialize the scanner and produce the STREAM-START token.
1300 yaml_parser_fetch_stream_start(yaml_parser_t *parser)
1302 yaml_simple_key_t simple_key = { 0, 0, 0, { 0, 0, 0 } };
1305 /* Set the initial indentation. */
1307 parser->indent = -1;
1309 /* Initialize the simple key stack. */
1311 if (!PUSH(parser, parser->simple_keys, simple_key))
1314 /* A simple key is allowed at the beginning of the stream. */
1316 parser->simple_key_allowed = 1;
1318 /* We have started. */
1320 parser->stream_start_produced = 1;
1322 /* Create the STREAM-START token and append it to the queue. */
1324 STREAM_START_TOKEN_INIT(token, parser->encoding,
1325 parser->mark, parser->mark);
1327 if (!ENQUEUE(parser, parser->tokens, token))
1334 * Produce the STREAM-END token and shut down the scanner.
1338 yaml_parser_fetch_stream_end(yaml_parser_t *parser)
1342 /* Force new line. */
1344 if (parser->mark.column != 0) {
1345 parser->mark.column = 0;
1346 parser->mark.line ++;
1349 /* Reset the indentation level. */
1351 if (!yaml_parser_unroll_indent(parser, -1))
1354 /* Reset simple keys. */
1356 if (!yaml_parser_remove_simple_key(parser))
1359 parser->simple_key_allowed = 0;
1361 /* Create the STREAM-END token and append it to the queue. */
1363 STREAM_END_TOKEN_INIT(token, parser->mark, parser->mark);
1365 if (!ENQUEUE(parser, parser->tokens, token))
1372 * Produce a VERSION-DIRECTIVE or TAG-DIRECTIVE token.
1376 yaml_parser_fetch_directive(yaml_parser_t *parser)
1380 /* Reset the indentation level. */
1382 if (!yaml_parser_unroll_indent(parser, -1))
1385 /* Reset simple keys. */
1387 if (!yaml_parser_remove_simple_key(parser))
1390 parser->simple_key_allowed = 0;
1392 /* Create the YAML-DIRECTIVE or TAG-DIRECTIVE token. */
1394 if (!yaml_parser_scan_directive(parser, &token))
1397 /* Append the token to the queue. */
1399 if (!ENQUEUE(parser, parser->tokens, token)) {
1400 yaml_token_delete(&token);
1408 * Produce the DOCUMENT-START or DOCUMENT-END token.
1412 yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
1413 yaml_token_type_t type)
1415 yaml_mark_t start_mark, end_mark;
1418 /* Reset the indentation level. */
1420 if (!yaml_parser_unroll_indent(parser, -1))
1423 /* Reset simple keys. */
1425 if (!yaml_parser_remove_simple_key(parser))
1428 parser->simple_key_allowed = 0;
1430 /* Consume the token. */
1432 start_mark = parser->mark;
1438 end_mark = parser->mark;
1440 /* Create the DOCUMENT-START or DOCUMENT-END token. */
1442 TOKEN_INIT(token, type, start_mark, end_mark);
1444 /* Append the token to the queue. */
1446 if (!ENQUEUE(parser, parser->tokens, token))
1453 * Produce the FLOW-SEQUENCE-START or FLOW-MAPPING-START token.
1457 yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
1458 yaml_token_type_t type)
1460 yaml_mark_t start_mark, end_mark;
1463 /* The indicators '[' and '{' may start a simple key. */
1465 if (!yaml_parser_save_simple_key(parser))
1468 /* Increase the flow level. */
1470 if (!yaml_parser_increase_flow_level(parser))
1473 /* A simple key may follow the indicators '[' and '{'. */
1475 parser->simple_key_allowed = 1;
1477 /* Consume the token. */
1479 start_mark = parser->mark;
1481 end_mark = parser->mark;
1483 /* Create the FLOW-SEQUENCE-START of FLOW-MAPPING-START token. */
1485 TOKEN_INIT(token, type, start_mark, end_mark);
1487 /* Append the token to the queue. */
1489 if (!ENQUEUE(parser, parser->tokens, token))
1496 * Produce the FLOW-SEQUENCE-END or FLOW-MAPPING-END token.
1500 yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
1501 yaml_token_type_t type)
1503 yaml_mark_t start_mark, end_mark;
1506 /* Reset any potential simple key on the current flow level. */
1508 if (!yaml_parser_remove_simple_key(parser))
1511 /* Decrease the flow level. */
1513 if (!yaml_parser_decrease_flow_level(parser))
1516 /* No simple keys after the indicators ']' and '}'. */
1518 parser->simple_key_allowed = 0;
1520 /* Consume the token. */
1522 start_mark = parser->mark;
1524 end_mark = parser->mark;
1526 /* Create the FLOW-SEQUENCE-END of FLOW-MAPPING-END token. */
1528 TOKEN_INIT(token, type, start_mark, end_mark);
1530 /* Append the token to the queue. */
1532 if (!ENQUEUE(parser, parser->tokens, token))
1539 * Produce the FLOW-ENTRY token.
1543 yaml_parser_fetch_flow_entry(yaml_parser_t *parser)
1545 yaml_mark_t start_mark, end_mark;
1548 /* Reset any potential simple keys on the current flow level. */
1550 if (!yaml_parser_remove_simple_key(parser))
1553 /* Simple keys are allowed after ','. */
1555 parser->simple_key_allowed = 1;
1557 /* Consume the token. */
1559 start_mark = parser->mark;
1561 end_mark = parser->mark;
1563 /* Create the FLOW-ENTRY token and append it to the queue. */
1565 TOKEN_INIT(token, YAML_FLOW_ENTRY_TOKEN, start_mark, end_mark);
1567 if (!ENQUEUE(parser, parser->tokens, token))
1574 * Produce the BLOCK-ENTRY token.
1578 yaml_parser_fetch_block_entry(yaml_parser_t *parser)
1580 yaml_mark_t start_mark, end_mark;
1583 /* Check if the scanner is in the block context. */
1585 if (!parser->flow_level)
1587 /* Check if we are allowed to start a new entry. */
1589 if (!parser->simple_key_allowed) {
1590 return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1591 "block sequence entries are not allowed in this context");
1594 /* Add the BLOCK-SEQUENCE-START token if needed. */
1596 if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1597 YAML_BLOCK_SEQUENCE_START_TOKEN, parser->mark))
1603 * It is an error for the '-' indicator to occur in the flow context,
1604 * but we let the Parser detect and report about it because the Parser
1605 * is able to point to the context.
1609 /* Reset any potential simple keys on the current flow level. */
1611 if (!yaml_parser_remove_simple_key(parser))
1614 /* Simple keys are allowed after '-'. */
1616 parser->simple_key_allowed = 1;
1618 /* Consume the token. */
1620 start_mark = parser->mark;
1622 end_mark = parser->mark;
1624 /* Create the BLOCK-ENTRY token and append it to the queue. */
1626 TOKEN_INIT(token, YAML_BLOCK_ENTRY_TOKEN, start_mark, end_mark);
1628 if (!ENQUEUE(parser, parser->tokens, token))
1635 * Produce the KEY token.
1639 yaml_parser_fetch_key(yaml_parser_t *parser)
1641 yaml_mark_t start_mark, end_mark;
1644 /* In the block context, additional checks are required. */
1646 if (!parser->flow_level)
1648 /* Check if we are allowed to start a new key (not nessesary simple). */
1650 if (!parser->simple_key_allowed) {
1651 return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1652 "mapping keys are not allowed in this context");
1655 /* Add the BLOCK-MAPPING-START token if needed. */
1657 if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1658 YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
1662 /* Reset any potential simple keys on the current flow level. */
1664 if (!yaml_parser_remove_simple_key(parser))
1667 /* Simple keys are allowed after '?' in the block context. */
1669 parser->simple_key_allowed = (!parser->flow_level);
1671 /* Consume the token. */
1673 start_mark = parser->mark;
1675 end_mark = parser->mark;
1677 /* Create the KEY token and append it to the queue. */
1679 TOKEN_INIT(token, YAML_KEY_TOKEN, start_mark, end_mark);
1681 if (!ENQUEUE(parser, parser->tokens, token))
1688 * Produce the VALUE token.
1692 yaml_parser_fetch_value(yaml_parser_t *parser)
1694 yaml_mark_t start_mark, end_mark;
1696 yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
1698 /* Have we found a simple key? */
1700 if (simple_key->possible)
1703 /* Create the KEY token and insert it into the queue. */
1705 TOKEN_INIT(token, YAML_KEY_TOKEN, simple_key->mark, simple_key->mark);
1707 if (!QUEUE_INSERT(parser, parser->tokens,
1708 simple_key->token_number - parser->tokens_parsed, token))
1711 /* In the block context, we may need to add the BLOCK-MAPPING-START token. */
1713 if (!yaml_parser_roll_indent(parser, simple_key->mark.column,
1714 simple_key->token_number,
1715 YAML_BLOCK_MAPPING_START_TOKEN, simple_key->mark))
1718 /* Remove the simple key. */
1720 simple_key->possible = 0;
1722 /* A simple key cannot follow another simple key. */
1724 parser->simple_key_allowed = 0;
1728 /* The ':' indicator follows a complex key. */
1730 /* In the block context, extra checks are required. */
1732 if (!parser->flow_level)
1734 /* Check if we are allowed to start a complex value. */
1736 if (!parser->simple_key_allowed) {
1737 return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1738 "mapping values are not allowed in this context");
1741 /* Add the BLOCK-MAPPING-START token if needed. */
1743 if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1744 YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
1748 /* Simple keys after ':' are allowed in the block context. */
1750 parser->simple_key_allowed = (!parser->flow_level);
1753 /* Consume the token. */
1755 start_mark = parser->mark;
1757 end_mark = parser->mark;
1759 /* Create the VALUE token and append it to the queue. */
1761 TOKEN_INIT(token, YAML_VALUE_TOKEN, start_mark, end_mark);
1763 if (!ENQUEUE(parser, parser->tokens, token))
1770 * Produce the ALIAS or ANCHOR token.
1774 yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type)
1778 /* An anchor or an alias could be a simple key. */
1780 if (!yaml_parser_save_simple_key(parser))
1783 /* A simple key cannot follow an anchor or an alias. */
1785 parser->simple_key_allowed = 0;
1787 /* Create the ALIAS or ANCHOR token and append it to the queue. */
1789 if (!yaml_parser_scan_anchor(parser, &token, type))
1792 if (!ENQUEUE(parser, parser->tokens, token)) {
1793 yaml_token_delete(&token);
1800 * Produce the TAG token.
1804 yaml_parser_fetch_tag(yaml_parser_t *parser)
1808 /* A tag could be a simple key. */
1810 if (!yaml_parser_save_simple_key(parser))
1813 /* A simple key cannot follow a tag. */
1815 parser->simple_key_allowed = 0;
1817 /* Create the TAG token and append it to the queue. */
1819 if (!yaml_parser_scan_tag(parser, &token))
1822 if (!ENQUEUE(parser, parser->tokens, token)) {
1823 yaml_token_delete(&token);
1831 * Produce the SCALAR(...,literal) or SCALAR(...,folded) tokens.
1835 yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal)
1839 /* Remove any potential simple keys. */
1841 if (!yaml_parser_remove_simple_key(parser))
1844 /* A simple key may follow a block scalar. */
1846 parser->simple_key_allowed = 1;
1848 /* Create the SCALAR token and append it to the queue. */
1850 if (!yaml_parser_scan_block_scalar(parser, &token, literal))
1853 if (!ENQUEUE(parser, parser->tokens, token)) {
1854 yaml_token_delete(&token);
1862 * Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens.
1866 yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single)
1870 /* A plain scalar could be a simple key. */
1872 if (!yaml_parser_save_simple_key(parser))
1875 /* A simple key cannot follow a flow scalar. */
1877 parser->simple_key_allowed = 0;
1879 /* Create the SCALAR token and append it to the queue. */
1881 if (!yaml_parser_scan_flow_scalar(parser, &token, single))
1884 if (!ENQUEUE(parser, parser->tokens, token)) {
1885 yaml_token_delete(&token);
1893 * Produce the SCALAR(...,plain) token.
1897 yaml_parser_fetch_plain_scalar(yaml_parser_t *parser)
1901 /* A plain scalar could be a simple key. */
1903 if (!yaml_parser_save_simple_key(parser))
1906 /* A simple key cannot follow a flow scalar. */
1908 parser->simple_key_allowed = 0;
1910 /* Create the SCALAR token and append it to the queue. */
1912 if (!yaml_parser_scan_plain_scalar(parser, &token))
1915 if (!ENQUEUE(parser, parser->tokens, token)) {
1916 yaml_token_delete(&token);
1924 * Eat whitespaces and comments until the next token is found.
1928 yaml_parser_scan_to_next_token(yaml_parser_t *parser)
1930 /* Until the next token is not found. */
1934 /* Allow the BOM mark to start a line. */
1936 if (!CACHE(parser, 1)) return 0;
1938 if (parser->mark.column == 0 && IS_BOM(parser->buffer))
1946 * - in the flow context;
1947 * - in the block context, but not at the beginning of the line or
1948 * after '-', '?', or ':' (complex value).
1951 if (!CACHE(parser, 1)) return 0;
1953 while (CHECK(parser->buffer,' ') ||
1954 ((parser->flow_level || !parser->simple_key_allowed) &&
1955 CHECK(parser->buffer, '\t'))) {
1957 if (!CACHE(parser, 1)) return 0;
1960 /* Eat a comment until a line break. */
1962 if (CHECK(parser->buffer, '#')) {
1963 while (!IS_BREAKZ(parser->buffer)) {
1965 if (!CACHE(parser, 1)) return 0;
1969 /* If it is a line break, eat it. */
1971 if (IS_BREAK(parser->buffer))
1973 if (!CACHE(parser, 2)) return 0;
1976 /* In the block context, a new line may start a simple key. */
1978 if (!parser->flow_level) {
1979 parser->simple_key_allowed = 1;
1984 /* We have found a token. */
1994 * Scan a YAML-DIRECTIVE or TAG-DIRECTIVE token.
1997 * %YAML 1.1 # a comment \n
1998 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1999 * %TAG !yaml! tag:yaml.org,2002: \n
2000 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2004 yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token)
2006 yaml_mark_t start_mark, end_mark;
2007 yaml_char_t *name = NULL;
2009 yaml_char_t *handle = NULL, *prefix = NULL;
2013 start_mark = parser->mark;
2017 /* Scan the directive name. */
2019 if (!yaml_parser_scan_directive_name(parser, start_mark, &name))
2022 /* Is it a YAML directive? */
2024 if (strcmp((char *)name, "YAML") == 0)
2026 /* Scan the VERSION directive value. */
2028 if (!yaml_parser_scan_version_directive_value(parser, start_mark,
2032 end_mark = parser->mark;
2034 /* Create a VERSION-DIRECTIVE token. */
2036 VERSION_DIRECTIVE_TOKEN_INIT(*token, major, minor,
2037 start_mark, end_mark);
2040 /* Is it a TAG directive? */
2042 else if (strcmp((char *)name, "TAG") == 0)
2044 /* Scan the TAG directive value. */
2046 if (!yaml_parser_scan_tag_directive_value(parser, start_mark,
2050 end_mark = parser->mark;
2052 /* Create a TAG-DIRECTIVE token. */
2054 TAG_DIRECTIVE_TOKEN_INIT(*token, handle, prefix,
2055 start_mark, end_mark);
2058 /* Unknown directive. */
2062 yaml_parser_set_scanner_error(parser, "while scanning a directive",
2063 start_mark, "found uknown directive name");
2067 /* Eat the rest of the line including any comments. */
2069 if (!CACHE(parser, 1)) goto error;
2071 while (IS_BLANK(parser->buffer)) {
2073 if (!CACHE(parser, 1)) goto error;
2076 if (CHECK(parser->buffer, '#')) {
2077 while (!IS_BREAKZ(parser->buffer)) {
2079 if (!CACHE(parser, 1)) goto error;
2083 /* Check if we are at the end of the line. */
2085 if (!IS_BREAKZ(parser->buffer)) {
2086 yaml_parser_set_scanner_error(parser, "while scanning a directive",
2087 start_mark, "did not find expected comment or line break");
2091 /* Eat a line break. */
2093 if (IS_BREAK(parser->buffer)) {
2094 if (!CACHE(parser, 2)) goto error;
2110 * Scan the directive name.
2113 * %YAML 1.1 # a comment \n
2115 * %TAG !yaml! tag:yaml.org,2002: \n
2120 yaml_parser_scan_directive_name(yaml_parser_t *parser,
2121 yaml_mark_t start_mark, yaml_char_t **name)
2123 yaml_string_t string = NULL_STRING;
2125 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2127 /* Consume the directive name. */
2129 if (!CACHE(parser, 1)) goto error;
2131 while (IS_ALPHA(parser->buffer))
2133 if (!READ(parser, string)) goto error;
2134 if (!CACHE(parser, 1)) goto error;
2137 /* Check if the name is empty. */
2139 if (string.start == string.pointer) {
2140 yaml_parser_set_scanner_error(parser, "while scanning a directive",
2141 start_mark, "could not find expected directive name");
2145 /* Check for an blank character after the name. */
2147 if (!IS_BLANKZ(parser->buffer)) {
2148 yaml_parser_set_scanner_error(parser, "while scanning a directive",
2149 start_mark, "found unexpected non-alphabetical character");
2153 *name = string.start;
2158 STRING_DEL(parser, string);
2163 * Scan the value of VERSION-DIRECTIVE.
2166 * %YAML 1.1 # a comment \n
2171 yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
2172 yaml_mark_t start_mark, int *major, int *minor)
2174 /* Eat whitespaces. */
2176 if (!CACHE(parser, 1)) return 0;
2178 while (IS_BLANK(parser->buffer)) {
2180 if (!CACHE(parser, 1)) return 0;
2183 /* Consume the major version number. */
2185 if (!yaml_parser_scan_version_directive_number(parser, start_mark, major))
2190 if (!CHECK(parser->buffer, '.')) {
2191 return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2192 start_mark, "did not find expected digit or '.' character");
2197 /* Consume the minor version number. */
2199 if (!yaml_parser_scan_version_directive_number(parser, start_mark, minor))
2205 #define MAX_NUMBER_LENGTH 9
2208 * Scan the version number of VERSION-DIRECTIVE.
2211 * %YAML 1.1 # a comment \n
2213 * %YAML 1.1 # a comment \n
2218 yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
2219 yaml_mark_t start_mark, int *number)
2224 /* Repeat while the next character is digit. */
2226 if (!CACHE(parser, 1)) return 0;
2228 while (IS_DIGIT(parser->buffer))
2230 /* Check if the number is too long. */
2232 if (++length > MAX_NUMBER_LENGTH) {
2233 return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2234 start_mark, "found extremely long version number");
2237 value = value*10 + AS_DIGIT(parser->buffer);
2241 if (!CACHE(parser, 1)) return 0;
2244 /* Check if the number was present. */
2247 return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2248 start_mark, "did not find expected version number");
2257 * Scan the value of a TAG-DIRECTIVE token.
2260 * %TAG !yaml! tag:yaml.org,2002: \n
2261 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2265 yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
2266 yaml_mark_t start_mark, yaml_char_t **handle, yaml_char_t **prefix)
2268 yaml_char_t *handle_value = NULL;
2269 yaml_char_t *prefix_value = NULL;
2271 /* Eat whitespaces. */
2273 if (!CACHE(parser, 1)) goto error;
2275 while (IS_BLANK(parser->buffer)) {
2277 if (!CACHE(parser, 1)) goto error;
2280 /* Scan a handle. */
2282 if (!yaml_parser_scan_tag_handle(parser, 1, start_mark, &handle_value))
2285 /* Expect a whitespace. */
2287 if (!CACHE(parser, 1)) goto error;
2289 if (!IS_BLANK(parser->buffer)) {
2290 yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
2291 start_mark, "did not find expected whitespace");
2295 /* Eat whitespaces. */
2297 while (IS_BLANK(parser->buffer)) {
2299 if (!CACHE(parser, 1)) goto error;
2302 /* Scan a prefix. */
2304 if (!yaml_parser_scan_tag_uri(parser, 1, NULL, start_mark, &prefix_value))
2307 /* Expect a whitespace or line break. */
2309 if (!CACHE(parser, 1)) goto error;
2311 if (!IS_BLANKZ(parser->buffer)) {
2312 yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
2313 start_mark, "did not find expected whitespace or line break");
2317 *handle = handle_value;
2318 *prefix = prefix_value;
2323 yaml_free(handle_value);
2324 yaml_free(prefix_value);
2329 yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
2330 yaml_token_type_t type)
2333 yaml_mark_t start_mark, end_mark;
2334 yaml_string_t string = NULL_STRING;
2336 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2338 /* Eat the indicator character. */
2340 start_mark = parser->mark;
2344 /* Consume the value. */
2346 if (!CACHE(parser, 1)) goto error;
2348 while (IS_ALPHA(parser->buffer)) {
2349 if (!READ(parser, string)) goto error;
2350 if (!CACHE(parser, 1)) goto error;
2354 end_mark = parser->mark;
2357 * Check if length of the anchor is greater than 0 and it is followed by
2358 * a whitespace character or one of the indicators:
2360 * '?', ':', ',', ']', '}', '%', '@', '`'.
2363 if (!length || !(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '?')
2364 || CHECK(parser->buffer, ':') || CHECK(parser->buffer, ',')
2365 || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '}')
2366 || CHECK(parser->buffer, '%') || CHECK(parser->buffer, '@')
2367 || CHECK(parser->buffer, '`'))) {
2368 yaml_parser_set_scanner_error(parser, type == YAML_ANCHOR_TOKEN ?
2369 "while scanning an anchor" : "while scanning an alias", start_mark,
2370 "did not find expected alphabetic or numeric character");
2374 /* Create a token. */
2376 if (type == YAML_ANCHOR_TOKEN) {
2377 ANCHOR_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2380 ALIAS_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2386 STRING_DEL(parser, string);
2395 yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token)
2397 yaml_char_t *handle = NULL;
2398 yaml_char_t *suffix = NULL;
2399 yaml_mark_t start_mark, end_mark;
2401 start_mark = parser->mark;
2403 /* Check if the tag is in the canonical form. */
2405 if (!CACHE(parser, 2)) goto error;
2407 if (CHECK_AT(parser->buffer, '<', 1))
2409 /* Set the handle to '' */
2411 handle = yaml_malloc(1);
2412 if (!handle) goto error;
2420 /* Consume the tag value. */
2422 if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2425 /* Check for '>' and eat it. */
2427 if (!CHECK(parser->buffer, '>')) {
2428 yaml_parser_set_scanner_error(parser, "while scanning a tag",
2429 start_mark, "did not find the expected '>'");
2437 /* The tag has either the '!suffix' or the '!handle!suffix' form. */
2439 /* First, try to scan a handle. */
2441 if (!yaml_parser_scan_tag_handle(parser, 0, start_mark, &handle))
2444 /* Check if it is, indeed, handle. */
2446 if (handle[0] == '!' && handle[1] != '\0' && handle[strlen((char *)handle)-1] == '!')
2448 /* Scan the suffix now. */
2450 if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2455 /* It wasn't a handle after all. Scan the rest of the tag. */
2457 if (!yaml_parser_scan_tag_uri(parser, 0, handle, start_mark, &suffix))
2460 /* Set the handle to '!'. */
2463 handle = yaml_malloc(2);
2464 if (!handle) goto error;
2469 * A special case: the '!' tag. Set the handle to '' and the
2473 if (suffix[0] == '\0') {
2474 yaml_char_t *tmp = handle;
2481 /* Check the character which ends the tag. */
2483 if (!CACHE(parser, 1)) goto error;
2485 if (!IS_BLANKZ(parser->buffer)) {
2486 yaml_parser_set_scanner_error(parser, "while scanning a tag",
2487 start_mark, "did not find expected whitespace or line break");
2491 end_mark = parser->mark;
2493 /* Create a token. */
2495 TAG_TOKEN_INIT(*token, handle, suffix, start_mark, end_mark);
2506 * Scan a tag handle.
2510 yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
2511 yaml_mark_t start_mark, yaml_char_t **handle)
2513 yaml_string_t string = NULL_STRING;
2515 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2517 /* Check the initial '!' character. */
2519 if (!CACHE(parser, 1)) goto error;
2521 if (!CHECK(parser->buffer, '!')) {
2522 yaml_parser_set_scanner_error(parser, directive ?
2523 "while scanning a tag directive" : "while scanning a tag",
2524 start_mark, "did not find expected '!'");
2528 /* Copy the '!' character. */
2530 if (!READ(parser, string)) goto error;
2532 /* Copy all subsequent alphabetical and numerical characters. */
2534 if (!CACHE(parser, 1)) goto error;
2536 while (IS_ALPHA(parser->buffer))
2538 if (!READ(parser, string)) goto error;
2539 if (!CACHE(parser, 1)) goto error;
2542 /* Check if the trailing character is '!' and copy it. */
2544 if (CHECK(parser->buffer, '!'))
2546 if (!READ(parser, string)) goto error;
2551 * It's either the '!' tag or not really a tag handle. If it's a %TAG
2552 * directive, it's an error. If it's a tag token, it must be a part of
2556 if (directive && !(string.start[0] == '!' && string.start[1] == '\0')) {
2557 yaml_parser_set_scanner_error(parser, "while parsing a tag directive",
2558 start_mark, "did not find expected '!'");
2563 *handle = string.start;
2568 STRING_DEL(parser, string);
2577 yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive,
2578 yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri)
2580 size_t length = head ? strlen((char *)head) : 0;
2581 yaml_string_t string = NULL_STRING;
2583 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2585 /* Resize the string to include the head. */
2587 while ((size_t)(string.end - string.start) <= length) {
2588 if (!yaml_string_extend(&string.start, &string.pointer, &string.end)) {
2589 parser->error = YAML_MEMORY_ERROR;
2595 * Copy the head if needed.
2597 * Note that we don't copy the leading '!' character.
2601 memcpy(string.start, head+1, length-1);
2602 string.pointer += length-1;
2607 if (!CACHE(parser, 1)) goto error;
2610 * The set of characters that may appear in URI is as follows:
2612 * '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&',
2613 * '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']',
2617 while (IS_ALPHA(parser->buffer) || CHECK(parser->buffer, ';')
2618 || CHECK(parser->buffer, '/') || CHECK(parser->buffer, '?')
2619 || CHECK(parser->buffer, ':') || CHECK(parser->buffer, '@')
2620 || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '=')
2621 || CHECK(parser->buffer, '+') || CHECK(parser->buffer, '$')
2622 || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '.')
2623 || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '~')
2624 || CHECK(parser->buffer, '*') || CHECK(parser->buffer, '\'')
2625 || CHECK(parser->buffer, '(') || CHECK(parser->buffer, ')')
2626 || CHECK(parser->buffer, '[') || CHECK(parser->buffer, ']')
2627 || CHECK(parser->buffer, '%'))
2629 /* Check if it is a URI-escape sequence. */
2631 if (CHECK(parser->buffer, '%')) {
2632 if (!STRING_EXTEND(parser, string))
2635 if (!yaml_parser_scan_uri_escapes(parser,
2636 directive, start_mark, &string)) goto error;
2639 if (!READ(parser, string)) goto error;
2643 if (!CACHE(parser, 1)) goto error;
2646 /* Check if the tag is non-empty. */
2649 if (!STRING_EXTEND(parser, string))
2652 yaml_parser_set_scanner_error(parser, directive ?
2653 "while parsing a %TAG directive" : "while parsing a tag",
2654 start_mark, "did not find expected tag URI");
2658 *uri = string.start;
2663 STRING_DEL(parser, string);
2668 * Decode an URI-escape sequence corresponding to a single UTF-8 character.
2672 yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
2673 yaml_mark_t start_mark, yaml_string_t *string)
2677 /* Decode the required number of characters. */
2681 unsigned char octet = 0;
2683 /* Check for a URI-escaped octet. */
2685 if (!CACHE(parser, 3)) return 0;
2687 if (!(CHECK(parser->buffer, '%')
2688 && IS_HEX_AT(parser->buffer, 1)
2689 && IS_HEX_AT(parser->buffer, 2))) {
2690 return yaml_parser_set_scanner_error(parser, directive ?
2691 "while parsing a %TAG directive" : "while parsing a tag",
2692 start_mark, "did not find URI escaped octet");
2695 /* Get the octet. */
2697 octet = (AS_HEX_AT(parser->buffer, 1) << 4) + AS_HEX_AT(parser->buffer, 2);
2699 /* If it is the leading octet, determine the length of the UTF-8 sequence. */
2703 width = (octet & 0x80) == 0x00 ? 1 :
2704 (octet & 0xE0) == 0xC0 ? 2 :
2705 (octet & 0xF0) == 0xE0 ? 3 :
2706 (octet & 0xF8) == 0xF0 ? 4 : 0;
2708 return yaml_parser_set_scanner_error(parser, directive ?
2709 "while parsing a %TAG directive" : "while parsing a tag",
2710 start_mark, "found an incorrect leading UTF-8 octet");
2715 /* Check if the trailing octet is correct. */
2717 if ((octet & 0xC0) != 0x80) {
2718 return yaml_parser_set_scanner_error(parser, directive ?
2719 "while parsing a %TAG directive" : "while parsing a tag",
2720 start_mark, "found an incorrect trailing UTF-8 octet");
2724 /* Copy the octet and move the pointers. */
2726 *(string->pointer++) = octet;
2737 * Scan a block scalar.
2741 yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
2744 yaml_mark_t start_mark;
2745 yaml_mark_t end_mark;
2746 yaml_string_t string = NULL_STRING;
2747 yaml_string_t leading_break = NULL_STRING;
2748 yaml_string_t trailing_breaks = NULL_STRING;
2752 int leading_blank = 0;
2753 int trailing_blank = 0;
2755 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2756 if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
2757 if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
2759 /* Eat the indicator '|' or '>'. */
2761 start_mark = parser->mark;
2765 /* Scan the additional block scalar indicators. */
2767 if (!CACHE(parser, 1)) goto error;
2769 /* Check for a chomping indicator. */
2771 if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-'))
2773 /* Set the chomping method and eat the indicator. */
2775 chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2779 /* Check for an indentation indicator. */
2781 if (!CACHE(parser, 1)) goto error;
2783 if (IS_DIGIT(parser->buffer))
2785 /* Check that the intendation is greater than 0. */
2787 if (CHECK(parser->buffer, '0')) {
2788 yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2789 start_mark, "found an intendation indicator equal to 0");
2793 /* Get the intendation level and eat the indicator. */
2795 increment = AS_DIGIT(parser->buffer);
2801 /* Do the same as above, but in the opposite order. */
2803 else if (IS_DIGIT(parser->buffer))
2805 if (CHECK(parser->buffer, '0')) {
2806 yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2807 start_mark, "found an intendation indicator equal to 0");
2811 increment = AS_DIGIT(parser->buffer);
2815 if (!CACHE(parser, 1)) goto error;
2817 if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) {
2818 chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2824 /* Eat whitespaces and comments to the end of the line. */
2826 if (!CACHE(parser, 1)) goto error;
2828 while (IS_BLANK(parser->buffer)) {
2830 if (!CACHE(parser, 1)) goto error;
2833 if (CHECK(parser->buffer, '#')) {
2834 while (!IS_BREAKZ(parser->buffer)) {
2836 if (!CACHE(parser, 1)) goto error;
2840 /* Check if we are at the end of the line. */
2842 if (!IS_BREAKZ(parser->buffer)) {
2843 yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2844 start_mark, "did not find expected comment or line break");
2848 /* Eat a line break. */
2850 if (IS_BREAK(parser->buffer)) {
2851 if (!CACHE(parser, 2)) goto error;
2855 end_mark = parser->mark;
2857 /* Set the intendation level if it was specified. */
2860 indent = parser->indent >= 0 ? parser->indent+increment : increment;
2863 /* Scan the leading line breaks and determine the indentation level if needed. */
2865 if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks,
2866 start_mark, &end_mark)) goto error;
2868 /* Scan the block scalar content. */
2870 if (!CACHE(parser, 1)) goto error;
2872 while ((int)parser->mark.column == indent && !IS_Z(parser->buffer))
2875 * We are at the beginning of a non-empty line.
2878 /* Is it a trailing whitespace? */
2880 trailing_blank = IS_BLANK(parser->buffer);
2882 /* Check if we need to fold the leading line break. */
2884 if (!literal && (*leading_break.start == '\n')
2885 && !leading_blank && !trailing_blank)
2887 /* Do we need to join the lines by space? */
2889 if (*trailing_breaks.start == '\0') {
2890 if (!STRING_EXTEND(parser, string)) goto error;
2891 *(string.pointer ++) = ' ';
2894 CLEAR(parser, leading_break);
2897 if (!JOIN(parser, string, leading_break)) goto error;
2898 CLEAR(parser, leading_break);
2901 /* Append the remaining line breaks. */
2903 if (!JOIN(parser, string, trailing_breaks)) goto error;
2904 CLEAR(parser, trailing_breaks);
2906 /* Is it a leading whitespace? */
2908 leading_blank = IS_BLANK(parser->buffer);
2910 /* Consume the current line. */
2912 while (!IS_BREAKZ(parser->buffer)) {
2913 if (!READ(parser, string)) goto error;
2914 if (!CACHE(parser, 1)) goto error;
2917 /* Consume the line break. */
2919 if (!CACHE(parser, 2)) goto error;
2921 if (!READ_LINE(parser, leading_break)) goto error;
2923 /* Eat the following intendation spaces and line breaks. */
2925 if (!yaml_parser_scan_block_scalar_breaks(parser,
2926 &indent, &trailing_breaks, start_mark, &end_mark)) goto error;
2929 /* Chomp the tail. */
2931 if (chomping != -1) {
2932 if (!JOIN(parser, string, leading_break)) goto error;
2934 if (chomping == 1) {
2935 if (!JOIN(parser, string, trailing_breaks)) goto error;
2938 /* Create a token. */
2940 SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
2941 literal ? YAML_LITERAL_SCALAR_STYLE : YAML_FOLDED_SCALAR_STYLE,
2942 start_mark, end_mark);
2944 STRING_DEL(parser, leading_break);
2945 STRING_DEL(parser, trailing_breaks);
2950 STRING_DEL(parser, string);
2951 STRING_DEL(parser, leading_break);
2952 STRING_DEL(parser, trailing_breaks);
2958 * Scan intendation spaces and line breaks for a block scalar. Determine the
2959 * intendation level if needed.
2963 yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser,
2964 int *indent, yaml_string_t *breaks,
2965 yaml_mark_t start_mark, yaml_mark_t *end_mark)
2969 *end_mark = parser->mark;
2971 /* Eat the intendation spaces and line breaks. */
2975 /* Eat the intendation spaces. */
2977 if (!CACHE(parser, 1)) return 0;
2979 while ((!*indent || (int)parser->mark.column < *indent)
2980 && IS_SPACE(parser->buffer)) {
2982 if (!CACHE(parser, 1)) return 0;
2985 if ((int)parser->mark.column > max_indent)
2986 max_indent = (int)parser->mark.column;
2988 /* Check for a tab character messing the intendation. */
2990 if ((!*indent || (int)parser->mark.column < *indent)
2991 && IS_TAB(parser->buffer)) {
2992 return yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2993 start_mark, "found a tab character where an intendation space is expected");
2996 /* Have we found a non-empty line? */
2998 if (!IS_BREAK(parser->buffer)) break;
3000 /* Consume the line break. */
3002 if (!CACHE(parser, 2)) return 0;
3003 if (!READ_LINE(parser, *breaks)) return 0;
3004 *end_mark = parser->mark;
3007 /* Determine the indentation level if needed. */
3010 *indent = max_indent;
3011 if (*indent < parser->indent + 1)
3012 *indent = parser->indent + 1;
3021 * Scan a quoted scalar.
3025 yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
3028 yaml_mark_t start_mark;
3029 yaml_mark_t end_mark;
3030 yaml_string_t string = NULL_STRING;
3031 yaml_string_t leading_break = NULL_STRING;
3032 yaml_string_t trailing_breaks = NULL_STRING;
3033 yaml_string_t whitespaces = NULL_STRING;
3036 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3037 if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3038 if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3039 if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
3041 /* Eat the left quote. */
3043 start_mark = parser->mark;
3047 /* Consume the content of the quoted scalar. */
3051 /* Check that there are no document indicators at the beginning of the line. */
3053 if (!CACHE(parser, 4)) goto error;
3055 if (parser->mark.column == 0 &&
3056 ((CHECK_AT(parser->buffer, '-', 0) &&
3057 CHECK_AT(parser->buffer, '-', 1) &&
3058 CHECK_AT(parser->buffer, '-', 2)) ||
3059 (CHECK_AT(parser->buffer, '.', 0) &&
3060 CHECK_AT(parser->buffer, '.', 1) &&
3061 CHECK_AT(parser->buffer, '.', 2))) &&
3062 IS_BLANKZ_AT(parser->buffer, 3))
3064 yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3065 start_mark, "found unexpected document indicator");
3069 /* Check for EOF. */
3071 if (IS_Z(parser->buffer)) {
3072 yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3073 start_mark, "found unexpected end of stream");
3077 /* Consume non-blank characters. */
3079 if (!CACHE(parser, 2)) goto error;
3083 while (!IS_BLANKZ(parser->buffer))
3085 /* Check for an escaped single quote. */
3087 if (single && CHECK_AT(parser->buffer, '\'', 0)
3088 && CHECK_AT(parser->buffer, '\'', 1))
3090 if (!STRING_EXTEND(parser, string)) goto error;
3091 *(string.pointer++) = '\'';
3096 /* Check for the right quote. */
3098 else if (CHECK(parser->buffer, single ? '\'' : '"'))
3103 /* Check for an escaped line break. */
3105 else if (!single && CHECK(parser->buffer, '\\')
3106 && IS_BREAK_AT(parser->buffer, 1))
3108 if (!CACHE(parser, 3)) goto error;
3115 /* Check for an escape sequence. */
3117 else if (!single && CHECK(parser->buffer, '\\'))
3119 size_t code_length = 0;
3121 if (!STRING_EXTEND(parser, string)) goto error;
3123 /* Check the escape character. */
3125 switch (parser->buffer.pointer[1])
3128 *(string.pointer++) = '\0';
3132 *(string.pointer++) = '\x07';
3136 *(string.pointer++) = '\x08';
3141 *(string.pointer++) = '\x09';
3145 *(string.pointer++) = '\x0A';
3149 *(string.pointer++) = '\x0B';
3153 *(string.pointer++) = '\x0C';
3157 *(string.pointer++) = '\x0D';
3161 *(string.pointer++) = '\x1B';
3165 *(string.pointer++) = '\x20';
3169 *(string.pointer++) = '"';
3173 *(string.pointer++) = '\'';
3177 *(string.pointer++) = '\\';
3180 case 'N': /* NEL (#x85) */
3181 *(string.pointer++) = '\xC2';
3182 *(string.pointer++) = '\x85';
3185 case '_': /* #xA0 */
3186 *(string.pointer++) = '\xC2';
3187 *(string.pointer++) = '\xA0';
3190 case 'L': /* LS (#x2028) */
3191 *(string.pointer++) = '\xE2';
3192 *(string.pointer++) = '\x80';
3193 *(string.pointer++) = '\xA8';
3196 case 'P': /* PS (#x2029) */
3197 *(string.pointer++) = '\xE2';
3198 *(string.pointer++) = '\x80';
3199 *(string.pointer++) = '\xA9';
3215 yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3216 start_mark, "found unknown escape character");
3223 /* Consume an arbitrary escape code. */
3227 unsigned int value = 0;
3230 /* Scan the character value. */
3232 if (!CACHE(parser, code_length)) goto error;
3234 for (k = 0; k < code_length; k ++) {
3235 if (!IS_HEX_AT(parser->buffer, k)) {
3236 yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3237 start_mark, "did not find expected hexdecimal number");
3240 value = (value << 4) + AS_HEX_AT(parser->buffer, k);
3243 /* Check the value and write the character. */
3245 if ((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) {
3246 yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3247 start_mark, "found invalid Unicode character escape code");
3251 if (value <= 0x7F) {
3252 *(string.pointer++) = value;
3254 else if (value <= 0x7FF) {
3255 *(string.pointer++) = 0xC0 + (value >> 6);
3256 *(string.pointer++) = 0x80 + (value & 0x3F);
3258 else if (value <= 0xFFFF) {
3259 *(string.pointer++) = 0xE0 + (value >> 12);
3260 *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
3261 *(string.pointer++) = 0x80 + (value & 0x3F);
3264 *(string.pointer++) = 0xF0 + (value >> 18);
3265 *(string.pointer++) = 0x80 + ((value >> 12) & 0x3F);
3266 *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
3267 *(string.pointer++) = 0x80 + (value & 0x3F);
3270 /* Advance the pointer. */
3272 for (k = 0; k < code_length; k ++) {
3280 /* It is a non-escaped non-blank character. */
3282 if (!READ(parser, string)) goto error;
3285 if (!CACHE(parser, 2)) goto error;
3288 /* Check if we are at the end of the scalar. */
3290 if (CHECK(parser->buffer, single ? '\'' : '"'))
3293 /* Consume blank characters. */
3295 if (!CACHE(parser, 1)) goto error;
3297 while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3299 if (IS_BLANK(parser->buffer))
3301 /* Consume a space or a tab character. */
3303 if (!leading_blanks) {
3304 if (!READ(parser, whitespaces)) goto error;
3312 if (!CACHE(parser, 2)) goto error;
3314 /* Check if it is a first line break. */
3316 if (!leading_blanks)
3318 CLEAR(parser, whitespaces);
3319 if (!READ_LINE(parser, leading_break)) goto error;
3324 if (!READ_LINE(parser, trailing_breaks)) goto error;
3327 if (!CACHE(parser, 1)) goto error;
3330 /* Join the whitespaces or fold line breaks. */
3334 /* Do we need to fold line breaks? */
3336 if (leading_break.start[0] == '\n') {
3337 if (trailing_breaks.start[0] == '\0') {
3338 if (!STRING_EXTEND(parser, string)) goto error;
3339 *(string.pointer++) = ' ';
3342 if (!JOIN(parser, string, trailing_breaks)) goto error;
3343 CLEAR(parser, trailing_breaks);
3345 CLEAR(parser, leading_break);
3348 if (!JOIN(parser, string, leading_break)) goto error;
3349 if (!JOIN(parser, string, trailing_breaks)) goto error;
3350 CLEAR(parser, leading_break);
3351 CLEAR(parser, trailing_breaks);
3356 if (!JOIN(parser, string, whitespaces)) goto error;
3357 CLEAR(parser, whitespaces);
3361 /* Eat the right quote. */
3365 end_mark = parser->mark;
3367 /* Create a token. */
3369 SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3370 single ? YAML_SINGLE_QUOTED_SCALAR_STYLE : YAML_DOUBLE_QUOTED_SCALAR_STYLE,
3371 start_mark, end_mark);
3373 STRING_DEL(parser, leading_break);
3374 STRING_DEL(parser, trailing_breaks);
3375 STRING_DEL(parser, whitespaces);
3380 STRING_DEL(parser, string);
3381 STRING_DEL(parser, leading_break);
3382 STRING_DEL(parser, trailing_breaks);
3383 STRING_DEL(parser, whitespaces);
3389 * Scan a plain scalar.
3393 yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token)
3395 yaml_mark_t start_mark;
3396 yaml_mark_t end_mark;
3397 yaml_string_t string = NULL_STRING;
3398 yaml_string_t leading_break = NULL_STRING;
3399 yaml_string_t trailing_breaks = NULL_STRING;
3400 yaml_string_t whitespaces = NULL_STRING;
3401 int leading_blanks = 0;
3402 int indent = parser->indent+1;
3404 if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3405 if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3406 if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3407 if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
3409 start_mark = end_mark = parser->mark;
3411 /* Consume the content of the plain scalar. */
3415 /* Check for a document indicator. */
3417 if (!CACHE(parser, 4)) goto error;
3419 if (parser->mark.column == 0 &&
3420 ((CHECK_AT(parser->buffer, '-', 0) &&
3421 CHECK_AT(parser->buffer, '-', 1) &&
3422 CHECK_AT(parser->buffer, '-', 2)) ||
3423 (CHECK_AT(parser->buffer, '.', 0) &&
3424 CHECK_AT(parser->buffer, '.', 1) &&
3425 CHECK_AT(parser->buffer, '.', 2))) &&
3426 IS_BLANKZ_AT(parser->buffer, 3)) break;
3428 /* Check for a comment. */
3430 if (CHECK(parser->buffer, '#'))
3433 /* Consume non-blank characters. */
3435 while (!IS_BLANKZ(parser->buffer))
3437 /* Check for 'x:x' in the flow context. TODO: Fix the test "spec-08-13". */
3439 if (parser->flow_level
3440 && CHECK(parser->buffer, ':')
3441 && !IS_BLANKZ_AT(parser->buffer, 1)) {
3442 yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3443 start_mark, "found unexpected ':'");
3447 /* Check for indicators that may end a plain scalar. */
3449 if ((CHECK(parser->buffer, ':') && IS_BLANKZ_AT(parser->buffer, 1))
3450 || (parser->flow_level &&
3451 (CHECK(parser->buffer, ',') || CHECK(parser->buffer, ':')
3452 || CHECK(parser->buffer, '?') || CHECK(parser->buffer, '[')
3453 || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{')
3454 || CHECK(parser->buffer, '}'))))
3457 /* Check if we need to join whitespaces and breaks. */
3459 if (leading_blanks || whitespaces.start != whitespaces.pointer)
3463 /* Do we need to fold line breaks? */
3465 if (leading_break.start[0] == '\n') {
3466 if (trailing_breaks.start[0] == '\0') {
3467 if (!STRING_EXTEND(parser, string)) goto error;
3468 *(string.pointer++) = ' ';
3471 if (!JOIN(parser, string, trailing_breaks)) goto error;
3472 CLEAR(parser, trailing_breaks);
3474 CLEAR(parser, leading_break);
3477 if (!JOIN(parser, string, leading_break)) goto error;
3478 if (!JOIN(parser, string, trailing_breaks)) goto error;
3479 CLEAR(parser, leading_break);
3480 CLEAR(parser, trailing_breaks);
3487 if (!JOIN(parser, string, whitespaces)) goto error;
3488 CLEAR(parser, whitespaces);
3492 /* Copy the character. */
3494 if (!READ(parser, string)) goto error;
3496 end_mark = parser->mark;
3498 if (!CACHE(parser, 2)) goto error;
3501 /* Is it the end? */
3503 if (!(IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)))
3506 /* Consume blank characters. */
3508 if (!CACHE(parser, 1)) goto error;
3510 while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3512 if (IS_BLANK(parser->buffer))
3514 /* Check for tab character that abuse intendation. */
3516 if (leading_blanks && (int)parser->mark.column < indent
3517 && IS_TAB(parser->buffer)) {
3518 yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3519 start_mark, "found a tab character that violate intendation");
3523 /* Consume a space or a tab character. */
3525 if (!leading_blanks) {
3526 if (!READ(parser, whitespaces)) goto error;
3534 if (!CACHE(parser, 2)) goto error;
3536 /* Check if it is a first line break. */
3538 if (!leading_blanks)
3540 CLEAR(parser, whitespaces);
3541 if (!READ_LINE(parser, leading_break)) goto error;
3546 if (!READ_LINE(parser, trailing_breaks)) goto error;
3549 if (!CACHE(parser, 1)) goto error;
3552 /* Check intendation level. */
3554 if (!parser->flow_level && (int)parser->mark.column < indent)
3558 /* Create a token. */
3560 SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3561 YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark);
3563 /* Note that we change the 'simple_key_allowed' flag. */
3565 if (leading_blanks) {
3566 parser->simple_key_allowed = 1;
3569 STRING_DEL(parser, leading_break);
3570 STRING_DEL(parser, trailing_breaks);
3571 STRING_DEL(parser, whitespaces);
3576 STRING_DEL(parser, string);
3577 STRING_DEL(parser, leading_break);
3578 STRING_DEL(parser, trailing_breaks);
3579 STRING_DEL(parser, whitespaces);