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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 correspoding 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− * 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)
1217− yaml_token_t token;
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);
1245− if (number == -1) {
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)
1269− yaml_token_t token;
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 } };
1303− yaml_token_t token;
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)
1340− yaml_token_t token;
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)
1378− yaml_token_t token;
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;
1416− yaml_token_t token;
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;
1461− yaml_token_t token;
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;
1504− yaml_token_t token;
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;
1546− yaml_token_t token;
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;
1581− yaml_token_t token;
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;
1642− yaml_token_t token;
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;
1695− yaml_token_t token;
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)
1776− yaml_token_t token;
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)
1806− yaml_token_t token;
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)
1837− yaml_token_t token;
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)
1868− yaml_token_t token;
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)
1899− yaml_token_t token;
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))
1944− * Tabs are allowed:
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);
2391− * Scan a TAG token.
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;
2605− /* Scan the tag. */
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 (!yaml_parser_scan_uri_escapes(parser,
2633− directive, start_mark, &string)) goto error;
2636− if (!READ(parser, string)) goto error;
2640− if (!CACHE(parser, 1)) goto error;
2643− /* Check if the tag is non-empty. */
2646− if (!STRING_EXTEND(parser, string))
2649− yaml_parser_set_scanner_error(parser, directive ?
2650− "while parsing a %TAG directive" : "while parsing a tag",
2651− start_mark, "did not find expected tag URI");
2655− *uri = string.start;
2660− STRING_DEL(parser, string);
2665− * Decode an URI-escape sequence corresponding to a single UTF-8 character.
2669−yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
2670− yaml_mark_t start_mark, yaml_string_t *string)
2674− /* Decode the required number of characters. */
2678− unsigned char octet = 0;
2680− /* Check for a URI-escaped octet. */
2682− if (!CACHE(parser, 3)) return 0;
2684− if (!(CHECK(parser->buffer, '%')
2685− && IS_HEX_AT(parser->buffer, 1)
2686− && IS_HEX_AT(parser->buffer, 2))) {
2687− return yaml_parser_set_scanner_error(parser, directive ?
2688− "while parsing a %TAG directive" : "while parsing a tag",
2689− start_mark, "did not find URI escaped octet");
2692− /* Get the octet. */
2694− octet = (AS_HEX_AT(parser->buffer, 1) << 4) + AS_HEX_AT(parser->buffer, 2);
2696− /* If it is the leading octet, determine the length of the UTF-8 sequence. */
2700− width = (octet & 0x80) == 0x00 ? 1 :
2701− (octet & 0xE0) == 0xC0 ? 2 :
2702− (octet & 0xF0) == 0xE0 ? 3 :
2703− (octet & 0xF8) == 0xF0 ? 4 : 0;
2705− return yaml_parser_set_scanner_error(parser, directive ?
2706− "while parsing a %TAG directive" : "while parsing a tag",
2707− start_mark, "found an incorrect leading UTF-8 octet");
2712− /* Check if the trailing octet is correct. */
2714− if ((octet & 0xC0) != 0x80) {
2715− return yaml_parser_set_scanner_error(parser, directive ?
2716− "while parsing a %TAG directive" : "while parsing a tag",
2717− start_mark, "found an incorrect trailing UTF-8 octet");
2721− /* Copy the octet and move the pointers. */
2723− *(string->pointer++) = octet;
2734− * Scan a block scalar.
2738−yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
2741− yaml_mark_t start_mark;
2742− yaml_mark_t end_mark;
2743− yaml_string_t string = NULL_STRING;
2744− yaml_string_t leading_break = NULL_STRING;
2745− yaml_string_t trailing_breaks = NULL_STRING;
2749− int leading_blank = 0;
2750− int trailing_blank = 0;
2752− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2753− if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
2754− if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
2756− /* Eat the indicator '|' or '>'. */
2758− start_mark = parser->mark;
2762− /* Scan the additional block scalar indicators. */
2764− if (!CACHE(parser, 1)) goto error;
2766− /* Check for a chomping indicator. */
2768− if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-'))
2770− /* Set the chomping method and eat the indicator. */
2772− chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2776− /* Check for an indentation indicator. */
2778− if (!CACHE(parser, 1)) goto error;
2780− if (IS_DIGIT(parser->buffer))
2782− /* Check that the intendation is greater than 0. */
2784− if (CHECK(parser->buffer, '0')) {
2785− yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2786− start_mark, "found an intendation indicator equal to 0");
2790− /* Get the intendation level and eat the indicator. */
2792− increment = AS_DIGIT(parser->buffer);
2798− /* Do the same as above, but in the opposite order. */
2800− else if (IS_DIGIT(parser->buffer))
2802− if (CHECK(parser->buffer, '0')) {
2803− yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2804− start_mark, "found an intendation indicator equal to 0");
2808− increment = AS_DIGIT(parser->buffer);
2812− if (!CACHE(parser, 1)) goto error;
2814− if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) {
2815− chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2821− /* Eat whitespaces and comments to the end of the line. */
2823− if (!CACHE(parser, 1)) goto error;
2825− while (IS_BLANK(parser->buffer)) {
2827− if (!CACHE(parser, 1)) goto error;
2830− if (CHECK(parser->buffer, '#')) {
2831− while (!IS_BREAKZ(parser->buffer)) {
2833− if (!CACHE(parser, 1)) goto error;
2837− /* Check if we are at the end of the line. */
2839− if (!IS_BREAKZ(parser->buffer)) {
2840− yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2841− start_mark, "did not find expected comment or line break");
2845− /* Eat a line break. */
2847− if (IS_BREAK(parser->buffer)) {
2848− if (!CACHE(parser, 2)) goto error;
2852− end_mark = parser->mark;
2854− /* Set the intendation level if it was specified. */
2857− indent = parser->indent >= 0 ? parser->indent+increment : increment;
2860− /* Scan the leading line breaks and determine the indentation level if needed. */
2862− if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks,
2863− start_mark, &end_mark)) goto error;
2865− /* Scan the block scalar content. */
2867− if (!CACHE(parser, 1)) goto error;
2869− while ((int)parser->mark.column == indent && !IS_Z(parser->buffer))
2872− * We are at the beginning of a non-empty line.
2875− /* Is it a trailing whitespace? */
2877− trailing_blank = IS_BLANK(parser->buffer);
2879− /* Check if we need to fold the leading line break. */
2881− if (!literal && (*leading_break.start == '\n')
2882− && !leading_blank && !trailing_blank)
2884− /* Do we need to join the lines by space? */
2886− if (*trailing_breaks.start == '\0') {
2887− if (!STRING_EXTEND(parser, string)) goto error;
2888− *(string.pointer ++) = ' ';
2891− CLEAR(parser, leading_break);
2894− if (!JOIN(parser, string, leading_break)) goto error;
2895− CLEAR(parser, leading_break);
2898− /* Append the remaining line breaks. */
2900− if (!JOIN(parser, string, trailing_breaks)) goto error;
2901− CLEAR(parser, trailing_breaks);
2903− /* Is it a leading whitespace? */
2905− leading_blank = IS_BLANK(parser->buffer);
2907− /* Consume the current line. */
2909− while (!IS_BREAKZ(parser->buffer)) {
2910− if (!READ(parser, string)) goto error;
2911− if (!CACHE(parser, 1)) goto error;
2914− /* Consume the line break. */
2916− if (!CACHE(parser, 2)) goto error;
2918− if (!READ_LINE(parser, leading_break)) goto error;
2920− /* Eat the following intendation spaces and line breaks. */
2922− if (!yaml_parser_scan_block_scalar_breaks(parser,
2923− &indent, &trailing_breaks, start_mark, &end_mark)) goto error;
2926− /* Chomp the tail. */
2928− if (chomping != -1) {
2929− if (!JOIN(parser, string, leading_break)) goto error;
2931− if (chomping == 1) {
2932− if (!JOIN(parser, string, trailing_breaks)) goto error;
2935− /* Create a token. */
2937− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
2938− literal ? YAML_LITERAL_SCALAR_STYLE : YAML_FOLDED_SCALAR_STYLE,
2939− start_mark, end_mark);
2941− STRING_DEL(parser, leading_break);
2942− STRING_DEL(parser, trailing_breaks);
2947− STRING_DEL(parser, string);
2948− STRING_DEL(parser, leading_break);
2949− STRING_DEL(parser, trailing_breaks);
2955− * Scan intendation spaces and line breaks for a block scalar. Determine the
2956− * intendation level if needed.
2960−yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser,
2961− int *indent, yaml_string_t *breaks,
2962− yaml_mark_t start_mark, yaml_mark_t *end_mark)
2964− int max_indent = 0;
2966− *end_mark = parser->mark;
2968− /* Eat the intendation spaces and line breaks. */
2972− /* Eat the intendation spaces. */
2974− if (!CACHE(parser, 1)) return 0;
2976− while ((!*indent || (int)parser->mark.column < *indent)
2977− && IS_SPACE(parser->buffer)) {
2979− if (!CACHE(parser, 1)) return 0;
2982− if ((int)parser->mark.column > max_indent)
2983− max_indent = (int)parser->mark.column;
2985− /* Check for a tab character messing the intendation. */
2987− if ((!*indent || (int)parser->mark.column < *indent)
2988− && IS_TAB(parser->buffer)) {
2989− return yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2990− start_mark, "found a tab character where an intendation space is expected");
2993− /* Have we found a non-empty line? */
2995− if (!IS_BREAK(parser->buffer)) break;
2997− /* Consume the line break. */
2999− if (!CACHE(parser, 2)) return 0;
3000− if (!READ_LINE(parser, *breaks)) return 0;
3001− *end_mark = parser->mark;
3004− /* Determine the indentation level if needed. */
3007− *indent = max_indent;
3008− if (*indent < parser->indent + 1)
3009− *indent = parser->indent + 1;
3018− * Scan a quoted scalar.
3022−yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
3025− yaml_mark_t start_mark;
3026− yaml_mark_t end_mark;
3027− yaml_string_t string = NULL_STRING;
3028− yaml_string_t leading_break = NULL_STRING;
3029− yaml_string_t trailing_breaks = NULL_STRING;
3030− yaml_string_t whitespaces = NULL_STRING;
3031− int leading_blanks;
3033− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3034− if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3035− if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3036− if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
3038− /* Eat the left quote. */
3040− start_mark = parser->mark;
3044− /* Consume the content of the quoted scalar. */
3048− /* Check that there are no document indicators at the beginning of the line. */
3050− if (!CACHE(parser, 4)) goto error;
3052− if (parser->mark.column == 0 &&
3053− ((CHECK_AT(parser->buffer, '-', 0) &&
3054− CHECK_AT(parser->buffer, '-', 1) &&
3055− CHECK_AT(parser->buffer, '-', 2)) ||
3056− (CHECK_AT(parser->buffer, '.', 0) &&
3057− CHECK_AT(parser->buffer, '.', 1) &&
3058− CHECK_AT(parser->buffer, '.', 2))) &&
3059− IS_BLANKZ_AT(parser->buffer, 3))
3061− yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3062− start_mark, "found unexpected document indicator");
3066− /* Check for EOF. */
3068− if (IS_Z(parser->buffer)) {
3069− yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3070− start_mark, "found unexpected end of stream");
3074− /* Consume non-blank characters. */
3076− if (!CACHE(parser, 2)) goto error;
3078− leading_blanks = 0;
3080− while (!IS_BLANKZ(parser->buffer))
3082− /* Check for an escaped single quote. */
3084− if (single && CHECK_AT(parser->buffer, '\'', 0)
3085− && CHECK_AT(parser->buffer, '\'', 1))
3087− if (!STRING_EXTEND(parser, string)) goto error;
3088− *(string.pointer++) = '\'';
3093− /* Check for the right quote. */
3095− else if (CHECK(parser->buffer, single ? '\'' : '"'))
3100− /* Check for an escaped line break. */
3102− else if (!single && CHECK(parser->buffer, '\\')
3103− && IS_BREAK_AT(parser->buffer, 1))
3105− if (!CACHE(parser, 3)) goto error;
3108− leading_blanks = 1;
3112− /* Check for an escape sequence. */
3114− else if (!single && CHECK(parser->buffer, '\\'))
3116− size_t code_length = 0;
3118− if (!STRING_EXTEND(parser, string)) goto error;
3120− /* Check the escape character. */
3122− switch (parser->buffer.pointer[1])
3125− *(string.pointer++) = '\0';
3129− *(string.pointer++) = '\x07';
3133− *(string.pointer++) = '\x08';
3138− *(string.pointer++) = '\x09';
3142− *(string.pointer++) = '\x0A';
3146− *(string.pointer++) = '\x0B';
3150− *(string.pointer++) = '\x0C';
3154− *(string.pointer++) = '\x0D';
3158− *(string.pointer++) = '\x1B';
3162− *(string.pointer++) = '\x20';
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− if (CHECK(parser->buffer, single ? '\'' : '"'))
3290− /* Consume blank characters. */
3292− if (!CACHE(parser, 1)) goto error;
3294− while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3296− if (IS_BLANK(parser->buffer))
3298− /* Consume a space or a tab character. */
3300− if (!leading_blanks) {
3301− if (!READ(parser, whitespaces)) goto error;
3309− if (!CACHE(parser, 2)) goto error;
3311− /* Check if it is a first line break. */
3313− if (!leading_blanks)
3315− CLEAR(parser, whitespaces);
3316− if (!READ_LINE(parser, leading_break)) goto error;
3317− leading_blanks = 1;
3321− if (!READ_LINE(parser, trailing_breaks)) goto error;
3324− if (!CACHE(parser, 1)) goto error;
3327− /* Join the whitespaces or fold line breaks. */
3329− if (leading_blanks)
3331− /* Do we need to fold line breaks? */
3333− if (leading_break.start[0] == '\n') {
3334− if (trailing_breaks.start[0] == '\0') {
3335− if (!STRING_EXTEND(parser, string)) goto error;
3336− *(string.pointer++) = ' ';
3339− if (!JOIN(parser, string, trailing_breaks)) goto error;
3340− CLEAR(parser, trailing_breaks);
3342− CLEAR(parser, leading_break);
3345− if (!JOIN(parser, string, leading_break)) goto error;
3346− if (!JOIN(parser, string, trailing_breaks)) goto error;
3347− CLEAR(parser, leading_break);
3348− CLEAR(parser, trailing_breaks);
3353− if (!JOIN(parser, string, whitespaces)) goto error;
3354− CLEAR(parser, whitespaces);
3358− /* Eat the right quote. */
3362− end_mark = parser->mark;
3364− /* Create a token. */
3366− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3367− single ? YAML_SINGLE_QUOTED_SCALAR_STYLE : YAML_DOUBLE_QUOTED_SCALAR_STYLE,
3368− start_mark, end_mark);
3370− STRING_DEL(parser, leading_break);
3371− STRING_DEL(parser, trailing_breaks);
3372− STRING_DEL(parser, whitespaces);
3377− STRING_DEL(parser, string);
3378− STRING_DEL(parser, leading_break);
3379− STRING_DEL(parser, trailing_breaks);
3380− STRING_DEL(parser, whitespaces);
3386− * Scan a plain scalar.
3390−yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token)
3392− yaml_mark_t start_mark;
3393− yaml_mark_t end_mark;
3394− yaml_string_t string = NULL_STRING;
3395− yaml_string_t leading_break = NULL_STRING;
3396− yaml_string_t trailing_breaks = NULL_STRING;
3397− yaml_string_t whitespaces = NULL_STRING;
3398− int leading_blanks = 0;
3399− int indent = parser->indent+1;
3401− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3402− if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3403− if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3404− if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
3406− start_mark = end_mark = parser->mark;
3408− /* Consume the content of the plain scalar. */
3412− /* Check for a document indicator. */
3414− if (!CACHE(parser, 4)) goto error;
3416− if (parser->mark.column == 0 &&
3417− ((CHECK_AT(parser->buffer, '-', 0) &&
3418− CHECK_AT(parser->buffer, '-', 1) &&
3419− CHECK_AT(parser->buffer, '-', 2)) ||
3420− (CHECK_AT(parser->buffer, '.', 0) &&
3421− CHECK_AT(parser->buffer, '.', 1) &&
3422− CHECK_AT(parser->buffer, '.', 2))) &&
3423− IS_BLANKZ_AT(parser->buffer, 3)) break;
3425− /* Check for a comment. */
3427− if (CHECK(parser->buffer, '#'))
3430− /* Consume non-blank characters. */
3432− while (!IS_BLANKZ(parser->buffer))
3434− /* Check for 'x:x' in the flow context. TODO: Fix the test "spec-08-13". */
3436− if (parser->flow_level
3437− && CHECK(parser->buffer, ':')
3438− && !IS_BLANKZ_AT(parser->buffer, 1)) {
3439− yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3440− start_mark, "found unexpected ':'");
3444− /* Check for indicators that may end a plain scalar. */
3446− if ((CHECK(parser->buffer, ':') && IS_BLANKZ_AT(parser->buffer, 1))
3447− || (parser->flow_level &&
3448− (CHECK(parser->buffer, ',') || CHECK(parser->buffer, ':')
3449− || CHECK(parser->buffer, '?') || CHECK(parser->buffer, '[')
3450− || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{')
3451− || CHECK(parser->buffer, '}'))))
3454− /* Check if we need to join whitespaces and breaks. */
3456− if (leading_blanks || whitespaces.start != whitespaces.pointer)
3458− if (leading_blanks)
3460− /* Do we need to fold line breaks? */
3462− if (leading_break.start[0] == '\n') {
3463− if (trailing_breaks.start[0] == '\0') {
3464− if (!STRING_EXTEND(parser, string)) goto error;
3465− *(string.pointer++) = ' ';
3468− if (!JOIN(parser, string, trailing_breaks)) goto error;
3469− CLEAR(parser, trailing_breaks);
3471− CLEAR(parser, leading_break);
3474− if (!JOIN(parser, string, leading_break)) goto error;
3475− if (!JOIN(parser, string, trailing_breaks)) goto error;
3476− CLEAR(parser, leading_break);
3477− CLEAR(parser, trailing_breaks);
3480− leading_blanks = 0;
3484− if (!JOIN(parser, string, whitespaces)) goto error;
3485− CLEAR(parser, whitespaces);
3489− /* Copy the character. */
3491− if (!READ(parser, string)) goto error;
3493− end_mark = parser->mark;
3495− if (!CACHE(parser, 2)) goto error;
3498− /* Is it the end? */
3500− if (!(IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)))
3503− /* Consume blank characters. */
3505− if (!CACHE(parser, 1)) goto error;
3507− while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3509− if (IS_BLANK(parser->buffer))
3511− /* Check for tab character that abuse intendation. */
3513− if (leading_blanks && (int)parser->mark.column < indent
3514− && IS_TAB(parser->buffer)) {
3515− yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3516− start_mark, "found a tab character that violate intendation");
3520− /* Consume a space or a tab character. */
3522− if (!leading_blanks) {
3523− if (!READ(parser, whitespaces)) goto error;
3531− if (!CACHE(parser, 2)) goto error;
3533− /* Check if it is a first line break. */
3535− if (!leading_blanks)
3537− CLEAR(parser, whitespaces);
3538− if (!READ_LINE(parser, leading_break)) goto error;
3539− leading_blanks = 1;
3543− if (!READ_LINE(parser, trailing_breaks)) goto error;
3546− if (!CACHE(parser, 1)) goto error;
3549− /* Check intendation level. */
3551− if (!parser->flow_level && (int)parser->mark.column < indent)
3555− /* Create a token. */
3557− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3558− YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark);
3560− /* Note that we change the 'simple_key_allowed' flag. */
3562− if (leading_blanks) {
3563− parser->simple_key_allowed = 1;
3566− STRING_DEL(parser, leading_break);
3567− STRING_DEL(parser, trailing_breaks);
3568− STRING_DEL(parser, whitespaces);
3573− STRING_DEL(parser, string);
3574− STRING_DEL(parser, leading_break);
3575− STRING_DEL(parser, trailing_breaks);
3576− STRING_DEL(parser, whitespaces);