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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
59− * STREAM-START token.
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 corresponding sequence of tokens:
75− * STREAM-START(utf-8)
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:
144− * TAG(handle,suffix)
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.
176− * --- a plain scalar
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
206− * FLOW-MAPPING-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)
236− * 2. A flow mapping:
239− * a simple key: a value, # Note that the KEY token is produced.
240− * ? a complex key: another value,
245− * STREAM-START(utf-8)
246− * FLOW-MAPPING-START
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)
325− * 2. Block mappings:
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 ++, \
497− parser->unread --, \
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 ++, \
511− parser->unread --, \
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 ++, \
523− parser->unread --, \
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− * If the current position may start a simple key, save it.
1112− if (parser->simple_key_allowed)
1114− yaml_simple_key_t simple_key;
1115− simple_key.possible = 1;
1116− simple_key.required = required;
1117− simple_key.token_number =
1118− parser->tokens_parsed + (parser->tokens.tail - parser->tokens.head);
1119− simple_key.mark = parser->mark;
1121− if (!yaml_parser_remove_simple_key(parser)) return 0;
1123− *(parser->simple_keys.top-1) = simple_key;
1130− * Remove a potential simple key at the current flow level.
1134−yaml_parser_remove_simple_key(yaml_parser_t *parser)
1136− yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
1138− if (simple_key->possible)
1140− /* If the key is required, it is an error. */
1142− if (simple_key->required) {
1143− return yaml_parser_set_scanner_error(parser,
1144− "while scanning a simple key", simple_key->mark,
1145− "could not find expected ':'");
1149− /* Remove the key from the stack. */
1151− simple_key->possible = 0;
1157− * Increase the flow level and resize the simple key list if needed.
1161−yaml_parser_increase_flow_level(yaml_parser_t *parser)
1163− yaml_simple_key_t empty_simple_key = { 0, 0, 0, { 0, 0, 0 } };
1165− /* Reset the simple key on the next level. */
1167− if (!PUSH(parser, parser->simple_keys, empty_simple_key))
1170− /* Increase the flow level. */
1172− if (parser->flow_level == INT_MAX) {
1173− parser->error = YAML_MEMORY_ERROR;
1177− parser->flow_level++;
1183− * Decrease the flow level.
1187−yaml_parser_decrease_flow_level(yaml_parser_t *parser)
1189− yaml_simple_key_t dummy_key; /* Used to eliminate a compiler warning. */
1191− if (parser->flow_level) {
1192− parser->flow_level --;
1193− dummy_key = POP(parser, parser->simple_keys);
1200− * Push the current indentation level to the stack and set the new level
1201− * the current column is greater than the indentation level. In this case,
1202− * append or insert the specified token into the token queue.
1207−yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column,
1208− ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark)
1210− yaml_token_t token;
1212− /* In the flow context, do nothing. */
1214− if (parser->flow_level)
1217− if (parser->indent < column)
1220− * Push the current indentation level to the stack and set the new
1221− * indentation level.
1224− if (!PUSH(parser, parser->indents, parser->indent))
1227− if (column > INT_MAX) {
1228− parser->error = YAML_MEMORY_ERROR;
1232− parser->indent = column;
1234− /* Create a token and insert it into the queue. */
1236− TOKEN_INIT(token, type, mark, mark);
1238− if (number == -1) {
1239− if (!ENQUEUE(parser, parser->tokens, token))
1243− if (!QUEUE_INSERT(parser,
1244− parser->tokens, number - parser->tokens_parsed, token))
1253− * Pop indentation levels from the indents stack until the current level
1254− * becomes less or equal to the column. For each indentation level, append
1255− * the BLOCK-END token.
1260−yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column)
1262− yaml_token_t token;
1264− /* In the flow context, do nothing. */
1266− if (parser->flow_level)
1269− /* Loop through the indentation levels in the stack. */
1271− while (parser->indent > column)
1273− /* Create a token and append it to the queue. */
1275− TOKEN_INIT(token, YAML_BLOCK_END_TOKEN, parser->mark, parser->mark);
1277− if (!ENQUEUE(parser, parser->tokens, token))
1280− /* Pop the indentation level. */
1282− parser->indent = POP(parser, parser->indents);
1289− * Initialize the scanner and produce the STREAM-START token.
1293−yaml_parser_fetch_stream_start(yaml_parser_t *parser)
1295− yaml_simple_key_t simple_key = { 0, 0, 0, { 0, 0, 0 } };
1296− yaml_token_t token;
1298− /* Set the initial indentation. */
1300− parser->indent = -1;
1302− /* Initialize the simple key stack. */
1304− if (!PUSH(parser, parser->simple_keys, simple_key))
1307− /* A simple key is allowed at the beginning of the stream. */
1309− parser->simple_key_allowed = 1;
1311− /* We have started. */
1313− parser->stream_start_produced = 1;
1315− /* Create the STREAM-START token and append it to the queue. */
1317− STREAM_START_TOKEN_INIT(token, parser->encoding,
1318− parser->mark, parser->mark);
1320− if (!ENQUEUE(parser, parser->tokens, token))
1327− * Produce the STREAM-END token and shut down the scanner.
1331−yaml_parser_fetch_stream_end(yaml_parser_t *parser)
1333− yaml_token_t token;
1335− /* Force new line. */
1337− if (parser->mark.column != 0) {
1338− parser->mark.column = 0;
1339− parser->mark.line ++;
1342− /* Reset the indentation level. */
1344− if (!yaml_parser_unroll_indent(parser, -1))
1347− /* Reset simple keys. */
1349− if (!yaml_parser_remove_simple_key(parser))
1352− parser->simple_key_allowed = 0;
1354− /* Create the STREAM-END token and append it to the queue. */
1356− STREAM_END_TOKEN_INIT(token, parser->mark, parser->mark);
1358− if (!ENQUEUE(parser, parser->tokens, token))
1365− * Produce a VERSION-DIRECTIVE or TAG-DIRECTIVE token.
1369−yaml_parser_fetch_directive(yaml_parser_t *parser)
1371− yaml_token_t token;
1373− /* Reset the indentation level. */
1375− if (!yaml_parser_unroll_indent(parser, -1))
1378− /* Reset simple keys. */
1380− if (!yaml_parser_remove_simple_key(parser))
1383− parser->simple_key_allowed = 0;
1385− /* Create the YAML-DIRECTIVE or TAG-DIRECTIVE token. */
1387− if (!yaml_parser_scan_directive(parser, &token))
1390− /* Append the token to the queue. */
1392− if (!ENQUEUE(parser, parser->tokens, token)) {
1393− yaml_token_delete(&token);
1401− * Produce the DOCUMENT-START or DOCUMENT-END token.
1405−yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
1406− yaml_token_type_t type)
1408− yaml_mark_t start_mark, end_mark;
1409− yaml_token_t token;
1411− /* Reset the indentation level. */
1413− if (!yaml_parser_unroll_indent(parser, -1))
1416− /* Reset simple keys. */
1418− if (!yaml_parser_remove_simple_key(parser))
1421− parser->simple_key_allowed = 0;
1423− /* Consume the token. */
1425− start_mark = parser->mark;
1431− end_mark = parser->mark;
1433− /* Create the DOCUMENT-START or DOCUMENT-END token. */
1435− TOKEN_INIT(token, type, start_mark, end_mark);
1437− /* Append the token to the queue. */
1439− if (!ENQUEUE(parser, parser->tokens, token))
1446− * Produce the FLOW-SEQUENCE-START or FLOW-MAPPING-START token.
1450−yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
1451− yaml_token_type_t type)
1453− yaml_mark_t start_mark, end_mark;
1454− yaml_token_t token;
1456− /* The indicators '[' and '{' may start a simple key. */
1458− if (!yaml_parser_save_simple_key(parser))
1461− /* Increase the flow level. */
1463− if (!yaml_parser_increase_flow_level(parser))
1466− /* A simple key may follow the indicators '[' and '{'. */
1468− parser->simple_key_allowed = 1;
1470− /* Consume the token. */
1472− start_mark = parser->mark;
1474− end_mark = parser->mark;
1476− /* Create the FLOW-SEQUENCE-START of FLOW-MAPPING-START token. */
1478− TOKEN_INIT(token, type, start_mark, end_mark);
1480− /* Append the token to the queue. */
1482− if (!ENQUEUE(parser, parser->tokens, token))
1489− * Produce the FLOW-SEQUENCE-END or FLOW-MAPPING-END token.
1493−yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
1494− yaml_token_type_t type)
1496− yaml_mark_t start_mark, end_mark;
1497− yaml_token_t token;
1499− /* Reset any potential simple key on the current flow level. */
1501− if (!yaml_parser_remove_simple_key(parser))
1504− /* Decrease the flow level. */
1506− if (!yaml_parser_decrease_flow_level(parser))
1509− /* No simple keys after the indicators ']' and '}'. */
1511− parser->simple_key_allowed = 0;
1513− /* Consume the token. */
1515− start_mark = parser->mark;
1517− end_mark = parser->mark;
1519− /* Create the FLOW-SEQUENCE-END of FLOW-MAPPING-END token. */
1521− TOKEN_INIT(token, type, start_mark, end_mark);
1523− /* Append the token to the queue. */
1525− if (!ENQUEUE(parser, parser->tokens, token))
1532− * Produce the FLOW-ENTRY token.
1536−yaml_parser_fetch_flow_entry(yaml_parser_t *parser)
1538− yaml_mark_t start_mark, end_mark;
1539− yaml_token_t token;
1541− /* Reset any potential simple keys on the current flow level. */
1543− if (!yaml_parser_remove_simple_key(parser))
1546− /* Simple keys are allowed after ','. */
1548− parser->simple_key_allowed = 1;
1550− /* Consume the token. */
1552− start_mark = parser->mark;
1554− end_mark = parser->mark;
1556− /* Create the FLOW-ENTRY token and append it to the queue. */
1558− TOKEN_INIT(token, YAML_FLOW_ENTRY_TOKEN, start_mark, end_mark);
1560− if (!ENQUEUE(parser, parser->tokens, token))
1567− * Produce the BLOCK-ENTRY token.
1571−yaml_parser_fetch_block_entry(yaml_parser_t *parser)
1573− yaml_mark_t start_mark, end_mark;
1574− yaml_token_t token;
1576− /* Check if the scanner is in the block context. */
1578− if (!parser->flow_level)
1580− /* Check if we are allowed to start a new entry. */
1582− if (!parser->simple_key_allowed) {
1583− return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1584− "block sequence entries are not allowed in this context");
1587− /* Add the BLOCK-SEQUENCE-START token if needed. */
1589− if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1590− YAML_BLOCK_SEQUENCE_START_TOKEN, parser->mark))
1596− * It is an error for the '-' indicator to occur in the flow context,
1597− * but we let the Parser detect and report about it because the Parser
1598− * is able to point to the context.
1602− /* Reset any potential simple keys on the current flow level. */
1604− if (!yaml_parser_remove_simple_key(parser))
1607− /* Simple keys are allowed after '-'. */
1609− parser->simple_key_allowed = 1;
1611− /* Consume the token. */
1613− start_mark = parser->mark;
1615− end_mark = parser->mark;
1617− /* Create the BLOCK-ENTRY token and append it to the queue. */
1619− TOKEN_INIT(token, YAML_BLOCK_ENTRY_TOKEN, start_mark, end_mark);
1621− if (!ENQUEUE(parser, parser->tokens, token))
1628− * Produce the KEY token.
1632−yaml_parser_fetch_key(yaml_parser_t *parser)
1634− yaml_mark_t start_mark, end_mark;
1635− yaml_token_t token;
1637− /* In the block context, additional checks are required. */
1639− if (!parser->flow_level)
1641− /* Check if we are allowed to start a new key (not nessesary simple). */
1643− if (!parser->simple_key_allowed) {
1644− return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1645− "mapping keys are not allowed in this context");
1648− /* Add the BLOCK-MAPPING-START token if needed. */
1650− if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1651− YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
1655− /* Reset any potential simple keys on the current flow level. */
1657− if (!yaml_parser_remove_simple_key(parser))
1660− /* Simple keys are allowed after '?' in the block context. */
1662− parser->simple_key_allowed = (!parser->flow_level);
1664− /* Consume the token. */
1666− start_mark = parser->mark;
1668− end_mark = parser->mark;
1670− /* Create the KEY token and append it to the queue. */
1672− TOKEN_INIT(token, YAML_KEY_TOKEN, start_mark, end_mark);
1674− if (!ENQUEUE(parser, parser->tokens, token))
1681− * Produce the VALUE token.
1685−yaml_parser_fetch_value(yaml_parser_t *parser)
1687− yaml_mark_t start_mark, end_mark;
1688− yaml_token_t token;
1689− yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
1691− /* Have we found a simple key? */
1693− if (simple_key->possible)
1696− /* Create the KEY token and insert it into the queue. */
1698− TOKEN_INIT(token, YAML_KEY_TOKEN, simple_key->mark, simple_key->mark);
1700− if (!QUEUE_INSERT(parser, parser->tokens,
1701− simple_key->token_number - parser->tokens_parsed, token))
1704− /* In the block context, we may need to add the BLOCK-MAPPING-START token. */
1706− if (!yaml_parser_roll_indent(parser, simple_key->mark.column,
1707− simple_key->token_number,
1708− YAML_BLOCK_MAPPING_START_TOKEN, simple_key->mark))
1711− /* Remove the simple key. */
1713− simple_key->possible = 0;
1715− /* A simple key cannot follow another simple key. */
1717− parser->simple_key_allowed = 0;
1721− /* The ':' indicator follows a complex key. */
1723− /* In the block context, extra checks are required. */
1725− if (!parser->flow_level)
1727− /* Check if we are allowed to start a complex value. */
1729− if (!parser->simple_key_allowed) {
1730− return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1731− "mapping values are not allowed in this context");
1734− /* Add the BLOCK-MAPPING-START token if needed. */
1736− if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1737− YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
1741− /* Simple keys after ':' are allowed in the block context. */
1743− parser->simple_key_allowed = (!parser->flow_level);
1746− /* Consume the token. */
1748− start_mark = parser->mark;
1750− end_mark = parser->mark;
1752− /* Create the VALUE token and append it to the queue. */
1754− TOKEN_INIT(token, YAML_VALUE_TOKEN, start_mark, end_mark);
1756− if (!ENQUEUE(parser, parser->tokens, token))
1763− * Produce the ALIAS or ANCHOR token.
1767−yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type)
1769− yaml_token_t token;
1771− /* An anchor or an alias could be a simple key. */
1773− if (!yaml_parser_save_simple_key(parser))
1776− /* A simple key cannot follow an anchor or an alias. */
1778− parser->simple_key_allowed = 0;
1780− /* Create the ALIAS or ANCHOR token and append it to the queue. */
1782− if (!yaml_parser_scan_anchor(parser, &token, type))
1785− if (!ENQUEUE(parser, parser->tokens, token)) {
1786− yaml_token_delete(&token);
1793− * Produce the TAG token.
1797−yaml_parser_fetch_tag(yaml_parser_t *parser)
1799− yaml_token_t token;
1801− /* A tag could be a simple key. */
1803− if (!yaml_parser_save_simple_key(parser))
1806− /* A simple key cannot follow a tag. */
1808− parser->simple_key_allowed = 0;
1810− /* Create the TAG token and append it to the queue. */
1812− if (!yaml_parser_scan_tag(parser, &token))
1815− if (!ENQUEUE(parser, parser->tokens, token)) {
1816− yaml_token_delete(&token);
1824− * Produce the SCALAR(...,literal) or SCALAR(...,folded) tokens.
1828−yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal)
1830− yaml_token_t token;
1832− /* Remove any potential simple keys. */
1834− if (!yaml_parser_remove_simple_key(parser))
1837− /* A simple key may follow a block scalar. */
1839− parser->simple_key_allowed = 1;
1841− /* Create the SCALAR token and append it to the queue. */
1843− if (!yaml_parser_scan_block_scalar(parser, &token, literal))
1846− if (!ENQUEUE(parser, parser->tokens, token)) {
1847− yaml_token_delete(&token);
1855− * Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens.
1859−yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single)
1861− yaml_token_t token;
1863− /* A plain scalar could be a simple key. */
1865− if (!yaml_parser_save_simple_key(parser))
1868− /* A simple key cannot follow a flow scalar. */
1870− parser->simple_key_allowed = 0;
1872− /* Create the SCALAR token and append it to the queue. */
1874− if (!yaml_parser_scan_flow_scalar(parser, &token, single))
1877− if (!ENQUEUE(parser, parser->tokens, token)) {
1878− yaml_token_delete(&token);
1886− * Produce the SCALAR(...,plain) token.
1890−yaml_parser_fetch_plain_scalar(yaml_parser_t *parser)
1892− yaml_token_t token;
1894− /* A plain scalar could be a simple key. */
1896− if (!yaml_parser_save_simple_key(parser))
1899− /* A simple key cannot follow a flow scalar. */
1901− parser->simple_key_allowed = 0;
1903− /* Create the SCALAR token and append it to the queue. */
1905− if (!yaml_parser_scan_plain_scalar(parser, &token))
1908− if (!ENQUEUE(parser, parser->tokens, token)) {
1909− yaml_token_delete(&token);
1917− * Eat whitespaces and comments until the next token is found.
1921−yaml_parser_scan_to_next_token(yaml_parser_t *parser)
1923− /* Until the next token is not found. */
1927− /* Allow the BOM mark to start a line. */
1929− if (!CACHE(parser, 1)) return 0;
1931− if (parser->mark.column == 0 && IS_BOM(parser->buffer))
1937− * Tabs are allowed:
1939− * - in the flow context;
1940− * - in the block context, but not at the beginning of the line or
1941− * after '-', '?', or ':' (complex value).
1944− if (!CACHE(parser, 1)) return 0;
1946− while (CHECK(parser->buffer,' ') ||
1947− ((parser->flow_level || !parser->simple_key_allowed) &&
1948− CHECK(parser->buffer, '\t'))) {
1950− if (!CACHE(parser, 1)) return 0;
1953− /* Eat a comment until a line break. */
1955− if (CHECK(parser->buffer, '#')) {
1956− while (!IS_BREAKZ(parser->buffer)) {
1958− if (!CACHE(parser, 1)) return 0;
1962− /* If it is a line break, eat it. */
1964− if (IS_BREAK(parser->buffer))
1966− if (!CACHE(parser, 2)) return 0;
1969− /* In the block context, a new line may start a simple key. */
1971− if (!parser->flow_level) {
1972− parser->simple_key_allowed = 1;
1977− /* We have found a token. */
1987− * Scan a YAML-DIRECTIVE or TAG-DIRECTIVE token.
1990− * %YAML 1.1 # a comment \n
1991− * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1992− * %TAG !yaml! tag:yaml.org,2002: \n
1993− * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1997−yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token)
1999− yaml_mark_t start_mark, end_mark;
2000− yaml_char_t *name = NULL;
2002− yaml_char_t *handle = NULL, *prefix = NULL;
2006− start_mark = parser->mark;
2010− /* Scan the directive name. */
2012− if (!yaml_parser_scan_directive_name(parser, start_mark, &name))
2015− /* Is it a YAML directive? */
2017− if (strcmp((char *)name, "YAML") == 0)
2019− /* Scan the VERSION directive value. */
2021− if (!yaml_parser_scan_version_directive_value(parser, start_mark,
2025− end_mark = parser->mark;
2027− /* Create a VERSION-DIRECTIVE token. */
2029− VERSION_DIRECTIVE_TOKEN_INIT(*token, major, minor,
2030− start_mark, end_mark);
2033− /* Is it a TAG directive? */
2035− else if (strcmp((char *)name, "TAG") == 0)
2037− /* Scan the TAG directive value. */
2039− if (!yaml_parser_scan_tag_directive_value(parser, start_mark,
2043− end_mark = parser->mark;
2045− /* Create a TAG-DIRECTIVE token. */
2047− TAG_DIRECTIVE_TOKEN_INIT(*token, handle, prefix,
2048− start_mark, end_mark);
2051− /* Unknown directive. */
2055− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2056− start_mark, "found unknown directive name");
2060− /* Eat the rest of the line including any comments. */
2062− if (!CACHE(parser, 1)) goto error;
2064− while (IS_BLANK(parser->buffer)) {
2066− if (!CACHE(parser, 1)) goto error;
2069− if (CHECK(parser->buffer, '#')) {
2070− while (!IS_BREAKZ(parser->buffer)) {
2072− if (!CACHE(parser, 1)) goto error;
2076− /* Check if we are at the end of the line. */
2078− if (!IS_BREAKZ(parser->buffer)) {
2079− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2080− start_mark, "did not find expected comment or line break");
2084− /* Eat a line break. */
2086− if (IS_BREAK(parser->buffer)) {
2087− if (!CACHE(parser, 2)) goto error;
2103− * Scan the directive name.
2106− * %YAML 1.1 # a comment \n
2108− * %TAG !yaml! tag:yaml.org,2002: \n
2113−yaml_parser_scan_directive_name(yaml_parser_t *parser,
2114− yaml_mark_t start_mark, yaml_char_t **name)
2116− yaml_string_t string = NULL_STRING;
2118− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2120− /* Consume the directive name. */
2122− if (!CACHE(parser, 1)) goto error;
2124− while (IS_ALPHA(parser->buffer))
2126− if (!READ(parser, string)) goto error;
2127− if (!CACHE(parser, 1)) goto error;
2130− /* Check if the name is empty. */
2132− if (string.start == string.pointer) {
2133− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2134− start_mark, "could not find expected directive name");
2138− /* Check for an blank character after the name. */
2140− if (!IS_BLANKZ(parser->buffer)) {
2141− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2142− start_mark, "found unexpected non-alphabetical character");
2146− *name = string.start;
2151− STRING_DEL(parser, string);
2156− * Scan the value of VERSION-DIRECTIVE.
2159− * %YAML 1.1 # a comment \n
2164−yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
2165− yaml_mark_t start_mark, int *major, int *minor)
2167− /* Eat whitespaces. */
2169− if (!CACHE(parser, 1)) return 0;
2171− while (IS_BLANK(parser->buffer)) {
2173− if (!CACHE(parser, 1)) return 0;
2176− /* Consume the major version number. */
2178− if (!yaml_parser_scan_version_directive_number(parser, start_mark, major))
2183− if (!CHECK(parser->buffer, '.')) {
2184− return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2185− start_mark, "did not find expected digit or '.' character");
2190− /* Consume the minor version number. */
2192− if (!yaml_parser_scan_version_directive_number(parser, start_mark, minor))
2198−#define MAX_NUMBER_LENGTH 9
2201− * Scan the version number of VERSION-DIRECTIVE.
2204− * %YAML 1.1 # a comment \n
2206− * %YAML 1.1 # a comment \n
2211−yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
2212− yaml_mark_t start_mark, int *number)
2217− /* Repeat while the next character is digit. */
2219− if (!CACHE(parser, 1)) return 0;
2221− while (IS_DIGIT(parser->buffer))
2223− /* Check if the number is too long. */
2225− if (++length > MAX_NUMBER_LENGTH) {
2226− return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2227− start_mark, "found extremely long version number");
2230− value = value*10 + AS_DIGIT(parser->buffer);
2234− if (!CACHE(parser, 1)) return 0;
2237− /* Check if the number was present. */
2240− return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2241− start_mark, "did not find expected version number");
2250− * Scan the value of a TAG-DIRECTIVE token.
2253− * %TAG !yaml! tag:yaml.org,2002: \n
2254− * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2258−yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
2259− yaml_mark_t start_mark, yaml_char_t **handle, yaml_char_t **prefix)
2261− yaml_char_t *handle_value = NULL;
2262− yaml_char_t *prefix_value = NULL;
2264− /* Eat whitespaces. */
2266− if (!CACHE(parser, 1)) goto error;
2268− while (IS_BLANK(parser->buffer)) {
2270− if (!CACHE(parser, 1)) goto error;
2273− /* Scan a handle. */
2275− if (!yaml_parser_scan_tag_handle(parser, 1, start_mark, &handle_value))
2278− /* Expect a whitespace. */
2280− if (!CACHE(parser, 1)) goto error;
2282− if (!IS_BLANK(parser->buffer)) {
2283− yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
2284− start_mark, "did not find expected whitespace");
2288− /* Eat whitespaces. */
2290− while (IS_BLANK(parser->buffer)) {
2292− if (!CACHE(parser, 1)) goto error;
2295− /* Scan a prefix. */
2297− if (!yaml_parser_scan_tag_uri(parser, 1, NULL, start_mark, &prefix_value))
2300− /* Expect a whitespace or line break. */
2302− if (!CACHE(parser, 1)) goto error;
2304− if (!IS_BLANKZ(parser->buffer)) {
2305− yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
2306− start_mark, "did not find expected whitespace or line break");
2310− *handle = handle_value;
2311− *prefix = prefix_value;
2316− yaml_free(handle_value);
2317− yaml_free(prefix_value);
2322−yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
2323− yaml_token_type_t type)
2326− yaml_mark_t start_mark, end_mark;
2327− yaml_string_t string = NULL_STRING;
2329− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2331− /* Eat the indicator character. */
2333− start_mark = parser->mark;
2337− /* Consume the value. */
2339− if (!CACHE(parser, 1)) goto error;
2341− while (IS_ALPHA(parser->buffer)) {
2342− if (!READ(parser, string)) goto error;
2343− if (!CACHE(parser, 1)) goto error;
2347− end_mark = parser->mark;
2350− * Check if length of the anchor is greater than 0 and it is followed by
2351− * a whitespace character or one of the indicators:
2353− * '?', ':', ',', ']', '}', '%', '@', '`'.
2356− if (!length || !(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '?')
2357− || CHECK(parser->buffer, ':') || CHECK(parser->buffer, ',')
2358− || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '}')
2359− || CHECK(parser->buffer, '%') || CHECK(parser->buffer, '@')
2360− || CHECK(parser->buffer, '`'))) {
2361− yaml_parser_set_scanner_error(parser, type == YAML_ANCHOR_TOKEN ?
2362− "while scanning an anchor" : "while scanning an alias", start_mark,
2363− "did not find expected alphabetic or numeric character");
2367− /* Create a token. */
2369− if (type == YAML_ANCHOR_TOKEN) {
2370− ANCHOR_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2373− ALIAS_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2379− STRING_DEL(parser, string);
2384− * Scan a TAG token.
2388−yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token)
2390− yaml_char_t *handle = NULL;
2391− yaml_char_t *suffix = NULL;
2392− yaml_mark_t start_mark, end_mark;
2394− start_mark = parser->mark;
2396− /* Check if the tag is in the canonical form. */
2398− if (!CACHE(parser, 2)) goto error;
2400− if (CHECK_AT(parser->buffer, '<', 1))
2402− /* Set the handle to '' */
2404− handle = yaml_malloc(1);
2405− if (!handle) goto error;
2413− /* Consume the tag value. */
2415− if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2418− /* Check for '>' and eat it. */
2420− if (!CHECK(parser->buffer, '>')) {
2421− yaml_parser_set_scanner_error(parser, "while scanning a tag",
2422− start_mark, "did not find the expected '>'");
2430− /* The tag has either the '!suffix' or the '!handle!suffix' form. */
2432− /* First, try to scan a handle. */
2434− if (!yaml_parser_scan_tag_handle(parser, 0, start_mark, &handle))
2437− /* Check if it is, indeed, handle. */
2439− if (handle[0] == '!' && handle[1] != '\0' && handle[strlen((char *)handle)-1] == '!')
2441− /* Scan the suffix now. */
2443− if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2448− /* It wasn't a handle after all. Scan the rest of the tag. */
2450− if (!yaml_parser_scan_tag_uri(parser, 0, handle, start_mark, &suffix))
2453− /* Set the handle to '!'. */
2456− handle = yaml_malloc(2);
2457− if (!handle) goto error;
2462− * A special case: the '!' tag. Set the handle to '' and the
2466− if (suffix[0] == '\0') {
2467− yaml_char_t *tmp = handle;
2474− /* Check the character which ends the tag. */
2476− if (!CACHE(parser, 1)) goto error;
2478− if (!IS_BLANKZ(parser->buffer)) {
2479− yaml_parser_set_scanner_error(parser, "while scanning a tag",
2480− start_mark, "did not find expected whitespace or line break");
2484− end_mark = parser->mark;
2486− /* Create a token. */
2488− TAG_TOKEN_INIT(*token, handle, suffix, start_mark, end_mark);
2499− * Scan a tag handle.
2503−yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
2504− yaml_mark_t start_mark, yaml_char_t **handle)
2506− yaml_string_t string = NULL_STRING;
2508− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2510− /* Check the initial '!' character. */
2512− if (!CACHE(parser, 1)) goto error;
2514− if (!CHECK(parser->buffer, '!')) {
2515− yaml_parser_set_scanner_error(parser, directive ?
2516− "while scanning a tag directive" : "while scanning a tag",
2517− start_mark, "did not find expected '!'");
2521− /* Copy the '!' character. */
2523− if (!READ(parser, string)) goto error;
2525− /* Copy all subsequent alphabetical and numerical characters. */
2527− if (!CACHE(parser, 1)) goto error;
2529− while (IS_ALPHA(parser->buffer))
2531− if (!READ(parser, string)) goto error;
2532− if (!CACHE(parser, 1)) goto error;
2535− /* Check if the trailing character is '!' and copy it. */
2537− if (CHECK(parser->buffer, '!'))
2539− if (!READ(parser, string)) goto error;
2544− * It's either the '!' tag or not really a tag handle. If it's a %TAG
2545− * directive, it's an error. If it's a tag token, it must be a part of
2549− if (directive && !(string.start[0] == '!' && string.start[1] == '\0')) {
2550− yaml_parser_set_scanner_error(parser, "while parsing a tag directive",
2551− start_mark, "did not find expected '!'");
2556− *handle = string.start;
2561− STRING_DEL(parser, string);
2570−yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive,
2571− yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri)
2573− size_t length = head ? strlen((char *)head) : 0;
2574− yaml_string_t string = NULL_STRING;
2576− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2578− /* Resize the string to include the head. */
2580− while ((size_t)(string.end - string.start) <= length) {
2581− if (!yaml_string_extend(&string.start, &string.pointer, &string.end)) {
2582− parser->error = YAML_MEMORY_ERROR;
2588− * Copy the head if needed.
2590− * Note that we don't copy the leading '!' character.
2594− memcpy(string.start, head+1, length-1);
2595− string.pointer += length-1;
2598− /* Scan the tag. */
2600− if (!CACHE(parser, 1)) goto error;
2603− * The set of characters that may appear in URI is as follows:
2605− * '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&',
2606− * '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']',
2610− while (IS_ALPHA(parser->buffer) || CHECK(parser->buffer, ';')
2611− || CHECK(parser->buffer, '/') || CHECK(parser->buffer, '?')
2612− || CHECK(parser->buffer, ':') || CHECK(parser->buffer, '@')
2613− || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '=')
2614− || CHECK(parser->buffer, '+') || CHECK(parser->buffer, '$')
2615− || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '.')
2616− || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '~')
2617− || CHECK(parser->buffer, '*') || CHECK(parser->buffer, '\'')
2618− || CHECK(parser->buffer, '(') || CHECK(parser->buffer, ')')
2619− || CHECK(parser->buffer, '[') || CHECK(parser->buffer, ']')
2620− || CHECK(parser->buffer, '%'))
2622− /* Check if it is a URI-escape sequence. */
2624− if (CHECK(parser->buffer, '%')) {
2625− if (!STRING_EXTEND(parser, string))
2628− if (!yaml_parser_scan_uri_escapes(parser,
2629− directive, start_mark, &string)) goto error;
2632− if (!READ(parser, string)) goto error;
2636− if (!CACHE(parser, 1)) goto error;
2639− /* Check if the tag is non-empty. */
2642− if (!STRING_EXTEND(parser, string))
2645− yaml_parser_set_scanner_error(parser, directive ?
2646− "while parsing a %TAG directive" : "while parsing a tag",
2647− start_mark, "did not find expected tag URI");
2651− *uri = string.start;
2656− STRING_DEL(parser, string);
2661− * Decode an URI-escape sequence corresponding to a single UTF-8 character.
2665−yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
2666− yaml_mark_t start_mark, yaml_string_t *string)
2670− /* Decode the required number of characters. */
2674− unsigned char octet = 0;
2676− /* Check for a URI-escaped octet. */
2678− if (!CACHE(parser, 3)) return 0;
2680− if (!(CHECK(parser->buffer, '%')
2681− && IS_HEX_AT(parser->buffer, 1)
2682− && IS_HEX_AT(parser->buffer, 2))) {
2683− return yaml_parser_set_scanner_error(parser, directive ?
2684− "while parsing a %TAG directive" : "while parsing a tag",
2685− start_mark, "did not find URI escaped octet");
2688− /* Get the octet. */
2690− octet = (AS_HEX_AT(parser->buffer, 1) << 4) + AS_HEX_AT(parser->buffer, 2);
2692− /* If it is the leading octet, determine the length of the UTF-8 sequence. */
2696− width = (octet & 0x80) == 0x00 ? 1 :
2697− (octet & 0xE0) == 0xC0 ? 2 :
2698− (octet & 0xF0) == 0xE0 ? 3 :
2699− (octet & 0xF8) == 0xF0 ? 4 : 0;
2701− return yaml_parser_set_scanner_error(parser, directive ?
2702− "while parsing a %TAG directive" : "while parsing a tag",
2703− start_mark, "found an incorrect leading UTF-8 octet");
2708− /* Check if the trailing octet is correct. */
2710− if ((octet & 0xC0) != 0x80) {
2711− return yaml_parser_set_scanner_error(parser, directive ?
2712− "while parsing a %TAG directive" : "while parsing a tag",
2713− start_mark, "found an incorrect trailing UTF-8 octet");
2717− /* Copy the octet and move the pointers. */
2719− *(string->pointer++) = octet;
2730− * Scan a block scalar.
2734−yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
2737− yaml_mark_t start_mark;
2738− yaml_mark_t end_mark;
2739− yaml_string_t string = NULL_STRING;
2740− yaml_string_t leading_break = NULL_STRING;
2741− yaml_string_t trailing_breaks = NULL_STRING;
2745− int leading_blank = 0;
2746− int trailing_blank = 0;
2748− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2749− if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
2750− if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
2752− /* Eat the indicator '|' or '>'. */
2754− start_mark = parser->mark;
2758− /* Scan the additional block scalar indicators. */
2760− if (!CACHE(parser, 1)) goto error;
2762− /* Check for a chomping indicator. */
2764− if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-'))
2766− /* Set the chomping method and eat the indicator. */
2768− chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2772− /* Check for an indentation indicator. */
2774− if (!CACHE(parser, 1)) goto error;
2776− if (IS_DIGIT(parser->buffer))
2778− /* Check that the indentation is greater than 0. */
2780− if (CHECK(parser->buffer, '0')) {
2781− yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2782− start_mark, "found an indentation indicator equal to 0");
2786− /* Get the indentation level and eat the indicator. */
2788− increment = AS_DIGIT(parser->buffer);
2794− /* Do the same as above, but in the opposite order. */
2796− else if (IS_DIGIT(parser->buffer))
2798− if (CHECK(parser->buffer, '0')) {
2799− yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2800− start_mark, "found an indentation indicator equal to 0");
2804− increment = AS_DIGIT(parser->buffer);
2808− if (!CACHE(parser, 1)) goto error;
2810− if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) {
2811− chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2817− /* Eat whitespaces and comments to the end of the line. */
2819− if (!CACHE(parser, 1)) goto error;
2821− while (IS_BLANK(parser->buffer)) {
2823− if (!CACHE(parser, 1)) goto error;
2826− if (CHECK(parser->buffer, '#')) {
2827− while (!IS_BREAKZ(parser->buffer)) {
2829− if (!CACHE(parser, 1)) goto error;
2833− /* Check if we are at the end of the line. */
2835− if (!IS_BREAKZ(parser->buffer)) {
2836− yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2837− start_mark, "did not find expected comment or line break");
2841− /* Eat a line break. */
2843− if (IS_BREAK(parser->buffer)) {
2844− if (!CACHE(parser, 2)) goto error;
2848− end_mark = parser->mark;
2850− /* Set the indentation level if it was specified. */
2853− indent = parser->indent >= 0 ? parser->indent+increment : increment;
2856− /* Scan the leading line breaks and determine the indentation level if needed. */
2858− if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks,
2859− start_mark, &end_mark)) goto error;
2861− /* Scan the block scalar content. */
2863− if (!CACHE(parser, 1)) goto error;
2865− while ((int)parser->mark.column == indent && !IS_Z(parser->buffer))
2868− * We are at the beginning of a non-empty line.
2871− /* Is it a trailing whitespace? */
2873− trailing_blank = IS_BLANK(parser->buffer);
2875− /* Check if we need to fold the leading line break. */
2877− if (!literal && (*leading_break.start == '\n')
2878− && !leading_blank && !trailing_blank)
2880− /* Do we need to join the lines by space? */
2882− if (*trailing_breaks.start == '\0') {
2883− if (!STRING_EXTEND(parser, string)) goto error;
2884− *(string.pointer ++) = ' ';
2887− CLEAR(parser, leading_break);
2890− if (!JOIN(parser, string, leading_break)) goto error;
2891− CLEAR(parser, leading_break);
2894− /* Append the remaining line breaks. */
2896− if (!JOIN(parser, string, trailing_breaks)) goto error;
2897− CLEAR(parser, trailing_breaks);
2899− /* Is it a leading whitespace? */
2901− leading_blank = IS_BLANK(parser->buffer);
2903− /* Consume the current line. */
2905− while (!IS_BREAKZ(parser->buffer)) {
2906− if (!READ(parser, string)) goto error;
2907− if (!CACHE(parser, 1)) goto error;
2910− /* Consume the line break. */
2912− if (!CACHE(parser, 2)) goto error;
2914− if (!READ_LINE(parser, leading_break)) goto error;
2916− /* Eat the following indentation spaces and line breaks. */
2918− if (!yaml_parser_scan_block_scalar_breaks(parser,
2919− &indent, &trailing_breaks, start_mark, &end_mark)) goto error;
2922− /* Chomp the tail. */
2924− if (chomping != -1) {
2925− if (!JOIN(parser, string, leading_break)) goto error;
2927− if (chomping == 1) {
2928− if (!JOIN(parser, string, trailing_breaks)) goto error;
2931− /* Create a token. */
2933− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
2934− literal ? YAML_LITERAL_SCALAR_STYLE : YAML_FOLDED_SCALAR_STYLE,
2935− start_mark, end_mark);
2937− STRING_DEL(parser, leading_break);
2938− STRING_DEL(parser, trailing_breaks);
2943− STRING_DEL(parser, string);
2944− STRING_DEL(parser, leading_break);
2945− STRING_DEL(parser, trailing_breaks);
2951− * Scan indentation spaces and line breaks for a block scalar. Determine the
2952− * indentation level if needed.
2956−yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser,
2957− int *indent, yaml_string_t *breaks,
2958− yaml_mark_t start_mark, yaml_mark_t *end_mark)
2960− int max_indent = 0;
2962− *end_mark = parser->mark;
2964− /* Eat the indentation spaces and line breaks. */
2968− /* Eat the indentation spaces. */
2970− if (!CACHE(parser, 1)) return 0;
2972− while ((!*indent || (int)parser->mark.column < *indent)
2973− && IS_SPACE(parser->buffer)) {
2975− if (!CACHE(parser, 1)) return 0;
2978− if ((int)parser->mark.column > max_indent)
2979− max_indent = (int)parser->mark.column;
2981− /* Check for a tab character messing the indentation. */
2983− if ((!*indent || (int)parser->mark.column < *indent)
2984− && IS_TAB(parser->buffer)) {
2985− return yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2986− start_mark, "found a tab character where an indentation space is expected");
2989− /* Have we found a non-empty line? */
2991− if (!IS_BREAK(parser->buffer)) break;
2993− /* Consume the line break. */
2995− if (!CACHE(parser, 2)) return 0;
2996− if (!READ_LINE(parser, *breaks)) return 0;
2997− *end_mark = parser->mark;
3000− /* Determine the indentation level if needed. */
3003− *indent = max_indent;
3004− if (*indent < parser->indent + 1)
3005− *indent = parser->indent + 1;
3014− * Scan a quoted scalar.
3018−yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
3021− yaml_mark_t start_mark;
3022− yaml_mark_t end_mark;
3023− yaml_string_t string = NULL_STRING;
3024− yaml_string_t leading_break = NULL_STRING;
3025− yaml_string_t trailing_breaks = NULL_STRING;
3026− yaml_string_t whitespaces = NULL_STRING;
3027− int leading_blanks;
3029− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3030− if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3031− if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3032− if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
3034− /* Eat the left quote. */
3036− start_mark = parser->mark;
3040− /* Consume the content of the quoted scalar. */
3044− /* Check that there are no document indicators at the beginning of the line. */
3046− if (!CACHE(parser, 4)) goto error;
3048− if (parser->mark.column == 0 &&
3049− ((CHECK_AT(parser->buffer, '-', 0) &&
3050− CHECK_AT(parser->buffer, '-', 1) &&
3051− CHECK_AT(parser->buffer, '-', 2)) ||
3052− (CHECK_AT(parser->buffer, '.', 0) &&
3053− CHECK_AT(parser->buffer, '.', 1) &&
3054− CHECK_AT(parser->buffer, '.', 2))) &&
3055− IS_BLANKZ_AT(parser->buffer, 3))
3057− yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3058− start_mark, "found unexpected document indicator");
3062− /* Check for EOF. */
3064− if (IS_Z(parser->buffer)) {
3065− yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3066− start_mark, "found unexpected end of stream");
3070− /* Consume non-blank characters. */
3072− if (!CACHE(parser, 2)) goto error;
3074− leading_blanks = 0;
3076− while (!IS_BLANKZ(parser->buffer))
3078− /* Check for an escaped single quote. */
3080− if (single && CHECK_AT(parser->buffer, '\'', 0)
3081− && CHECK_AT(parser->buffer, '\'', 1))
3083− if (!STRING_EXTEND(parser, string)) goto error;
3084− *(string.pointer++) = '\'';
3089− /* Check for the right quote. */
3091− else if (CHECK(parser->buffer, single ? '\'' : '"'))
3096− /* Check for an escaped line break. */
3098− else if (!single && CHECK(parser->buffer, '\\')
3099− && IS_BREAK_AT(parser->buffer, 1))
3101− if (!CACHE(parser, 3)) goto error;
3104− leading_blanks = 1;
3108− /* Check for an escape sequence. */
3110− else if (!single && CHECK(parser->buffer, '\\'))
3112− size_t code_length = 0;
3114− if (!STRING_EXTEND(parser, string)) goto error;
3116− /* Check the escape character. */
3118− switch (parser->buffer.pointer[1])
3121− *(string.pointer++) = '\0';
3125− *(string.pointer++) = '\x07';
3129− *(string.pointer++) = '\x08';
3134− *(string.pointer++) = '\x09';
3138− *(string.pointer++) = '\x0A';
3142− *(string.pointer++) = '\x0B';
3146− *(string.pointer++) = '\x0C';
3150− *(string.pointer++) = '\x0D';
3154− *(string.pointer++) = '\x1B';
3158− *(string.pointer++) = '\x20';
3162− *(string.pointer++) = '"';
3166− *(string.pointer++) = '/';
3170− *(string.pointer++) = '\'';
3174− *(string.pointer++) = '\\';
3177− case 'N': /* NEL (#x85) */
3178− *(string.pointer++) = '\xC2';
3179− *(string.pointer++) = '\x85';
3182− case '_': /* #xA0 */
3183− *(string.pointer++) = '\xC2';
3184− *(string.pointer++) = '\xA0';
3187− case 'L': /* LS (#x2028) */
3188− *(string.pointer++) = '\xE2';
3189− *(string.pointer++) = '\x80';
3190− *(string.pointer++) = '\xA8';
3193− case 'P': /* PS (#x2029) */
3194− *(string.pointer++) = '\xE2';
3195− *(string.pointer++) = '\x80';
3196− *(string.pointer++) = '\xA9';
3212− yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3213− start_mark, "found unknown escape character");
3220− /* Consume an arbitrary escape code. */
3224− unsigned int value = 0;
3227− /* Scan the character value. */
3229− if (!CACHE(parser, code_length)) goto error;
3231− for (k = 0; k < code_length; k ++) {
3232− if (!IS_HEX_AT(parser->buffer, k)) {
3233− yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3234− start_mark, "did not find expected hexdecimal number");
3237− value = (value << 4) + AS_HEX_AT(parser->buffer, k);
3240− /* Check the value and write the character. */
3242− if ((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) {
3243− yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3244− start_mark, "found invalid Unicode character escape code");
3248− if (value <= 0x7F) {
3249− *(string.pointer++) = value;
3251− else if (value <= 0x7FF) {
3252− *(string.pointer++) = 0xC0 + (value >> 6);
3253− *(string.pointer++) = 0x80 + (value & 0x3F);
3255− else if (value <= 0xFFFF) {
3256− *(string.pointer++) = 0xE0 + (value >> 12);
3257− *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
3258− *(string.pointer++) = 0x80 + (value & 0x3F);
3261− *(string.pointer++) = 0xF0 + (value >> 18);
3262− *(string.pointer++) = 0x80 + ((value >> 12) & 0x3F);
3263− *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
3264− *(string.pointer++) = 0x80 + (value & 0x3F);
3267− /* Advance the pointer. */
3269− for (k = 0; k < code_length; k ++) {
3277− /* It is a non-escaped non-blank character. */
3279− if (!READ(parser, string)) goto error;
3282− if (!CACHE(parser, 2)) goto error;
3285− /* Check if we are at the end of the scalar. */
3287− /* Fix for crash unitialized value crash
3288− * Credit for the bug and input is to OSS Fuzz
3289− * Credit for the fix to Alex Gaynor
3291− if (!CACHE(parser, 1)) goto error;
3292− if (CHECK(parser->buffer, single ? '\'' : '"'))
3295− /* Consume blank characters. */
3297− if (!CACHE(parser, 1)) goto error;
3299− while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3301− if (IS_BLANK(parser->buffer))
3303− /* Consume a space or a tab character. */
3305− if (!leading_blanks) {
3306− if (!READ(parser, whitespaces)) goto error;
3314− if (!CACHE(parser, 2)) goto error;
3316− /* Check if it is a first line break. */
3318− if (!leading_blanks)
3320− CLEAR(parser, whitespaces);
3321− if (!READ_LINE(parser, leading_break)) goto error;
3322− leading_blanks = 1;
3326− if (!READ_LINE(parser, trailing_breaks)) goto error;
3329− if (!CACHE(parser, 1)) goto error;
3332− /* Join the whitespaces or fold line breaks. */
3334− if (leading_blanks)
3336− /* Do we need to fold line breaks? */
3338− if (leading_break.start[0] == '\n') {
3339− if (trailing_breaks.start[0] == '\0') {
3340− if (!STRING_EXTEND(parser, string)) goto error;
3341− *(string.pointer++) = ' ';
3344− if (!JOIN(parser, string, trailing_breaks)) goto error;
3345− CLEAR(parser, trailing_breaks);
3347− CLEAR(parser, leading_break);
3350− if (!JOIN(parser, string, leading_break)) goto error;
3351− if (!JOIN(parser, string, trailing_breaks)) goto error;
3352− CLEAR(parser, leading_break);
3353− CLEAR(parser, trailing_breaks);
3358− if (!JOIN(parser, string, whitespaces)) goto error;
3359− CLEAR(parser, whitespaces);
3363− /* Eat the right quote. */
3367− end_mark = parser->mark;
3369− /* Create a token. */
3371− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3372− single ? YAML_SINGLE_QUOTED_SCALAR_STYLE : YAML_DOUBLE_QUOTED_SCALAR_STYLE,
3373− start_mark, end_mark);
3375− STRING_DEL(parser, leading_break);
3376− STRING_DEL(parser, trailing_breaks);
3377− STRING_DEL(parser, whitespaces);
3382− STRING_DEL(parser, string);
3383− STRING_DEL(parser, leading_break);
3384− STRING_DEL(parser, trailing_breaks);
3385− STRING_DEL(parser, whitespaces);
3391− * Scan a plain scalar.
3395−yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token)
3397− yaml_mark_t start_mark;
3398− yaml_mark_t end_mark;
3399− yaml_string_t string = NULL_STRING;
3400− yaml_string_t leading_break = NULL_STRING;
3401− yaml_string_t trailing_breaks = NULL_STRING;
3402− yaml_string_t whitespaces = NULL_STRING;
3403− int leading_blanks = 0;
3404− int indent = parser->indent+1;
3406− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3407− if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3408− if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3409− if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
3411− start_mark = end_mark = parser->mark;
3413− /* Consume the content of the plain scalar. */
3417− /* Check for a document indicator. */
3419− if (!CACHE(parser, 4)) goto error;
3421− if (parser->mark.column == 0 &&
3422− ((CHECK_AT(parser->buffer, '-', 0) &&
3423− CHECK_AT(parser->buffer, '-', 1) &&
3424− CHECK_AT(parser->buffer, '-', 2)) ||
3425− (CHECK_AT(parser->buffer, '.', 0) &&
3426− CHECK_AT(parser->buffer, '.', 1) &&
3427− CHECK_AT(parser->buffer, '.', 2))) &&
3428− IS_BLANKZ_AT(parser->buffer, 3)) break;
3430− /* Check for a comment. */
3432− if (CHECK(parser->buffer, '#'))
3435− /* Consume non-blank characters. */
3437− while (!IS_BLANKZ(parser->buffer))
3439− /* Check for 'x:x' in the flow context. TODO: Fix the test "spec-08-13". */
3441− if (parser->flow_level
3442− && CHECK(parser->buffer, ':')
3443− && !IS_BLANKZ_AT(parser->buffer, 1)) {
3444− yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3445− start_mark, "found unexpected ':'");
3449− /* Check for indicators that may end a plain scalar. */
3451− if ((CHECK(parser->buffer, ':') && IS_BLANKZ_AT(parser->buffer, 1))
3452− || (parser->flow_level &&
3453− (CHECK(parser->buffer, ',') || CHECK(parser->buffer, ':')
3454− || CHECK(parser->buffer, '?') || CHECK(parser->buffer, '[')
3455− || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{')
3456− || CHECK(parser->buffer, '}'))))
3459− /* Check if we need to join whitespaces and breaks. */
3461− if (leading_blanks || whitespaces.start != whitespaces.pointer)
3463− if (leading_blanks)
3465− /* Do we need to fold line breaks? */
3467− if (leading_break.start[0] == '\n') {
3468− if (trailing_breaks.start[0] == '\0') {
3469− if (!STRING_EXTEND(parser, string)) goto error;
3470− *(string.pointer++) = ' ';
3473− if (!JOIN(parser, string, trailing_breaks)) goto error;
3474− CLEAR(parser, trailing_breaks);
3476− CLEAR(parser, leading_break);
3479− if (!JOIN(parser, string, leading_break)) goto error;
3480− if (!JOIN(parser, string, trailing_breaks)) goto error;
3481− CLEAR(parser, leading_break);
3482− CLEAR(parser, trailing_breaks);
3485− leading_blanks = 0;
3489− if (!JOIN(parser, string, whitespaces)) goto error;
3490− CLEAR(parser, whitespaces);
3494− /* Copy the character. */
3496− if (!READ(parser, string)) goto error;
3498− end_mark = parser->mark;
3500− if (!CACHE(parser, 2)) goto error;
3503− /* Is it the end? */
3505− if (!(IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)))
3508− /* Consume blank characters. */
3510− if (!CACHE(parser, 1)) goto error;
3512− while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3514− if (IS_BLANK(parser->buffer))
3516− /* Check for tab character that abuse indentation. */
3518− if (leading_blanks && (int)parser->mark.column < indent
3519− && IS_TAB(parser->buffer)) {
3520− yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3521− start_mark, "found a tab character that violate indentation");
3525− /* Consume a space or a tab character. */
3527− if (!leading_blanks) {
3528− if (!READ(parser, whitespaces)) goto error;
3536− if (!CACHE(parser, 2)) goto error;
3538− /* Check if it is a first line break. */
3540− if (!leading_blanks)
3542− CLEAR(parser, whitespaces);
3543− if (!READ_LINE(parser, leading_break)) goto error;
3544− leading_blanks = 1;
3548− if (!READ_LINE(parser, trailing_breaks)) goto error;
3551− if (!CACHE(parser, 1)) goto error;
3554− /* Check indentation level. */
3556− if (!parser->flow_level && (int)parser->mark.column < indent)
3560− /* Create a token. */
3562− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3563− YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark);
3565− /* Note that we change the 'simple_key_allowed' flag. */
3567− if (leading_blanks) {
3568− parser->simple_key_allowed = 1;
3571− STRING_DEL(parser, leading_break);
3572− STRING_DEL(parser, trailing_breaks);
3573− STRING_DEL(parser, whitespaces);
3578− STRING_DEL(parser, string);
3579− STRING_DEL(parser, leading_break);
3580− STRING_DEL(parser, trailing_breaks);
3581− STRING_DEL(parser, whitespaces);