@@ -1,3584 +0,0 @@
1−
2−/*
3− * Introduction
4− * ************
5− *
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.
9− *
10− * The process of transforming a YAML stream into a sequence of events is
11− * divided on two steps: Scanning and Parsing.
12− *
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.
16− *
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).
20− *
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.
24− *
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.
27− *
28− * Now, tokens:
29− *
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 # '}'
43− * BLOCK-ENTRY # '-'
44− * FLOW-ENTRY # ','
45− * KEY # '?' or nothing (simple keys).
46− * VALUE # ':'
47− * ALIAS(anchor) # '*anchor'
48− * ANCHOR(anchor) # '&anchor'
49− * TAG(handle,suffix) # '!handle!suffix'
50− * SCALAR(value,style) # A scalar.
51− *
52− * The following two tokens are "virtual" tokens denoting the beginning and the
53− * end of the stream:
54− *
55− * STREAM-START(encoding)
56− * STREAM-END
57− *
58− * We pass the information about the input stream encoding with the
59− * STREAM-START token.
60− *
61− * The next two tokens are responsible for tags:
62− *
63− * VERSION-DIRECTIVE(major,minor)
64− * TAG-DIRECTIVE(handle,prefix)
65− *
66− * Example:
67− *
68− * %YAML 1.1
69− * %TAG ! !foo
70− * %TAG !yaml! tag:yaml.org,2002:
71− * ---
72− *
73− * The corresponding sequence of tokens:
74− *
75− * STREAM-START(utf-8)
76− * VERSION-DIRECTIVE(1,1)
77− * TAG-DIRECTIVE("!","!foo")
78− * TAG-DIRECTIVE("!yaml","tag:yaml.org,2002:")
79− * DOCUMENT-START
80− * STREAM-END
81− *
82− * Note that the VERSION-DIRECTIVE and TAG-DIRECTIVE tokens occupy a whole
83− * line.
84− *
85− * The document start and end indicators are represented by:
86− *
87− * DOCUMENT-START
88− * DOCUMENT-END
89− *
90− * Note that if a YAML stream contains an implicit document (without '---'
91− * and '...' indicators), no DOCUMENT-START and DOCUMENT-END tokens will be
92− * produced.
93− *
94− * In the following examples, we present whole documents together with the
95− * produced tokens.
96− *
97− * 1. An implicit document:
98− *
99− * 'a scalar'
100− *
101− * Tokens:
102− *
103− * STREAM-START(utf-8)
104− * SCALAR("a scalar",single-quoted)
105− * STREAM-END
106− *
107− * 2. An explicit document:
108− *
109− * ---
110− * 'a scalar'
111− * ...
112− *
113− * Tokens:
114− *
115− * STREAM-START(utf-8)
116− * DOCUMENT-START
117− * SCALAR("a scalar",single-quoted)
118− * DOCUMENT-END
119− * STREAM-END
120− *
121− * 3. Several documents in a stream:
122− *
123− * 'a scalar'
124− * ---
125− * 'another scalar'
126− * ---
127− * 'yet another scalar'
128− *
129− * Tokens:
130− *
131− * STREAM-START(utf-8)
132− * SCALAR("a scalar",single-quoted)
133− * DOCUMENT-START
134− * SCALAR("another scalar",single-quoted)
135− * DOCUMENT-START
136− * SCALAR("yet another scalar",single-quoted)
137− * STREAM-END
138− *
139− * We have already introduced the SCALAR token above. The following tokens are
140− * used to describe aliases, anchors, tag, and scalars:
141− *
142− * ALIAS(anchor)
143− * ANCHOR(anchor)
144− * TAG(handle,suffix)
145− * SCALAR(value,style)
146− *
147− * The following series of examples illustrate the usage of these tokens:
148− *
149− * 1. A recursive sequence:
150− *
151− * &A [ *A ]
152− *
153− * Tokens:
154− *
155− * STREAM-START(utf-8)
156− * ANCHOR("A")
157− * FLOW-SEQUENCE-START
158− * ALIAS("A")
159− * FLOW-SEQUENCE-END
160− * STREAM-END
161− *
162− * 2. A tagged scalar:
163− *
164− * !!float "3.14" # A good approximation.
165− *
166− * Tokens:
167− *
168− * STREAM-START(utf-8)
169− * TAG("!!","float")
170− * SCALAR("3.14",double-quoted)
171− * STREAM-END
172− *
173− * 3. Various scalar styles:
174− *
175− * --- # Implicit empty plain scalars do not produce tokens.
176− * --- a plain scalar
177− * --- 'a single-quoted scalar'
178− * --- "a double-quoted scalar"
179− * --- |-
180− * a literal scalar
181− * --- >-
182− * a folded
183− * scalar
184− *
185− * Tokens:
186− *
187− * STREAM-START(utf-8)
188− * DOCUMENT-START
189− * DOCUMENT-START
190− * SCALAR("a plain scalar",plain)
191− * DOCUMENT-START
192− * SCALAR("a single-quoted scalar",single-quoted)
193− * DOCUMENT-START
194− * SCALAR("a double-quoted scalar",double-quoted)
195− * DOCUMENT-START
196− * SCALAR("a literal scalar",literal)
197− * DOCUMENT-START
198− * SCALAR("a folded scalar",folded)
199− * STREAM-END
200− *
201− * Now it's time to review collection-related tokens. We will start with
202− * flow collections:
203− *
204− * FLOW-SEQUENCE-START
205− * FLOW-SEQUENCE-END
206− * FLOW-MAPPING-START
207− * FLOW-MAPPING-END
208− * FLOW-ENTRY
209− * KEY
210− * VALUE
211− *
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.
217− *
218− * The following examples show flow collections:
219− *
220− * 1. A flow sequence:
221− *
222− * [item 1, item 2, item 3]
223− *
224− * Tokens:
225− *
226− * STREAM-START(utf-8)
227− * FLOW-SEQUENCE-START
228− * SCALAR("item 1",plain)
229− * FLOW-ENTRY
230− * SCALAR("item 2",plain)
231− * FLOW-ENTRY
232− * SCALAR("item 3",plain)
233− * FLOW-SEQUENCE-END
234− * STREAM-END
235− *
236− * 2. A flow mapping:
237− *
238− * {
239− * a simple key: a value, # Note that the KEY token is produced.
240− * ? a complex key: another value,
241− * }
242− *
243− * Tokens:
244− *
245− * STREAM-START(utf-8)
246− * FLOW-MAPPING-START
247− * KEY
248− * SCALAR("a simple key",plain)
249− * VALUE
250− * SCALAR("a value",plain)
251− * FLOW-ENTRY
252− * KEY
253− * SCALAR("a complex key",plain)
254− * VALUE
255− * SCALAR("another value",plain)
256− * FLOW-ENTRY
257− * FLOW-MAPPING-END
258− * STREAM-END
259− *
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.
262− *
263− * For scanning block collections, the following tokens are used (note that we
264− * repeat KEY and VALUE here):
265− *
266− * BLOCK-SEQUENCE-START
267− * BLOCK-MAPPING-START
268− * BLOCK-END
269− * BLOCK-ENTRY
270− * KEY
271− * VALUE
272− *
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.
278− *
279− * The tokens BLOCK-ENTRY, KEY, and VALUE are used to represent the indicators
280− * '-', '?', and ':' correspondingly.
281− *
282− * The following examples show how the tokens BLOCK-SEQUENCE-START,
283− * BLOCK-MAPPING-START, and BLOCK-END are emitted by the Scanner:
284− *
285− * 1. Block sequences:
286− *
287− * - item 1
288− * - item 2
289− * -
290− * - item 3.1
291− * - item 3.2
292− * -
293− * key 1: value 1
294− * key 2: value 2
295− *
296− * Tokens:
297− *
298− * STREAM-START(utf-8)
299− * BLOCK-SEQUENCE-START
300− * BLOCK-ENTRY
301− * SCALAR("item 1",plain)
302− * BLOCK-ENTRY
303− * SCALAR("item 2",plain)
304− * BLOCK-ENTRY
305− * BLOCK-SEQUENCE-START
306− * BLOCK-ENTRY
307− * SCALAR("item 3.1",plain)
308− * BLOCK-ENTRY
309− * SCALAR("item 3.2",plain)
310− * BLOCK-END
311− * BLOCK-ENTRY
312− * BLOCK-MAPPING-START
313− * KEY
314− * SCALAR("key 1",plain)
315− * VALUE
316− * SCALAR("value 1",plain)
317− * KEY
318− * SCALAR("key 2",plain)
319− * VALUE
320− * SCALAR("value 2",plain)
321− * BLOCK-END
322− * BLOCK-END
323− * STREAM-END
324− *
325− * 2. Block mappings:
326− *
327− * a simple key: a value # The KEY token is produced here.
328− * ? a complex key
329− * : another value
330− * a mapping:
331− * key 1: value 1
332− * key 2: value 2
333− * a sequence:
334− * - item 1
335− * - item 2
336− *
337− * Tokens:
338− *
339− * STREAM-START(utf-8)
340− * BLOCK-MAPPING-START
341− * KEY
342− * SCALAR("a simple key",plain)
343− * VALUE
344− * SCALAR("a value",plain)
345− * KEY
346− * SCALAR("a complex key",plain)
347− * VALUE
348− * SCALAR("another value",plain)
349− * KEY
350− * SCALAR("a mapping",plain)
351− * BLOCK-MAPPING-START
352− * KEY
353− * SCALAR("key 1",plain)
354− * VALUE
355− * SCALAR("value 1",plain)
356− * KEY
357− * SCALAR("key 2",plain)
358− * VALUE
359− * SCALAR("value 2",plain)
360− * BLOCK-END
361− * KEY
362− * SCALAR("a sequence",plain)
363− * VALUE
364− * BLOCK-SEQUENCE-START
365− * BLOCK-ENTRY
366− * SCALAR("item 1",plain)
367− * BLOCK-ENTRY
368− * SCALAR("item 2",plain)
369− * BLOCK-END
370− * BLOCK-END
371− * STREAM-END
372− *
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:
377− *
378− * 1. Collections in a sequence:
379− *
380− * - - item 1
381− * - item 2
382− * - key 1: value 1
383− * key 2: value 2
384− * - ? complex key
385− * : complex value
386− *
387− * Tokens:
388− *
389− * STREAM-START(utf-8)
390− * BLOCK-SEQUENCE-START
391− * BLOCK-ENTRY
392− * BLOCK-SEQUENCE-START
393− * BLOCK-ENTRY
394− * SCALAR("item 1",plain)
395− * BLOCK-ENTRY
396− * SCALAR("item 2",plain)
397− * BLOCK-END
398− * BLOCK-ENTRY
399− * BLOCK-MAPPING-START
400− * KEY
401− * SCALAR("key 1",plain)
402− * VALUE
403− * SCALAR("value 1",plain)
404− * KEY
405− * SCALAR("key 2",plain)
406− * VALUE
407− * SCALAR("value 2",plain)
408− * BLOCK-END
409− * BLOCK-ENTRY
410− * BLOCK-MAPPING-START
411− * KEY
412− * SCALAR("complex key")
413− * VALUE
414− * SCALAR("complex value")
415− * BLOCK-END
416− * BLOCK-END
417− * STREAM-END
418− *
419− * 2. Collections in a mapping:
420− *
421− * ? a sequence
422− * : - item 1
423− * - item 2
424− * ? a mapping
425− * : key 1: value 1
426− * key 2: value 2
427− *
428− * Tokens:
429− *
430− * STREAM-START(utf-8)
431− * BLOCK-MAPPING-START
432− * KEY
433− * SCALAR("a sequence",plain)
434− * VALUE
435− * BLOCK-SEQUENCE-START
436− * BLOCK-ENTRY
437− * SCALAR("item 1",plain)
438− * BLOCK-ENTRY
439− * SCALAR("item 2",plain)
440− * BLOCK-END
441− * KEY
442− * SCALAR("a mapping",plain)
443− * VALUE
444− * BLOCK-MAPPING-START
445− * KEY
446− * SCALAR("key 1",plain)
447− * VALUE
448− * SCALAR("value 1",plain)
449− * KEY
450− * SCALAR("key 2",plain)
451− * VALUE
452− * SCALAR("value 2",plain)
453− * BLOCK-END
454− * BLOCK-END
455− * STREAM-END
456− *
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:
459− *
460− * key:
461− * - item 1 # BLOCK-SEQUENCE-START is NOT produced here.
462− * - item 2
463− *
464− * Tokens:
465− *
466− * STREAM-START(utf-8)
467− * BLOCK-MAPPING-START
468− * KEY
469− * SCALAR("key",plain)
470− * VALUE
471− * BLOCK-ENTRY
472− * SCALAR("item 1",plain)
473− * BLOCK-ENTRY
474− * SCALAR("item 2",plain)
475− * BLOCK-END
476− */
477−
478−#include "yaml_private.h"
479−
480−/*
481− * Ensure that the buffer contains the required number of characters.
482− * Return 1 on success, 0 on failure (reader error or memory error).
483− */
484−
485−#define CACHE(parser,length) \
486− (parser->unread >= (length) \
487− ? 1 \
488− : yaml_parser_update_buffer(parser, (length)))
489−
490−/*
491− * Advance the buffer pointer.
492− */
493−
494−#define SKIP(parser) \
495− (parser->mark.index ++, \
496− parser->mark.column ++, \
497− parser->unread --, \
498− parser->buffer.pointer += WIDTH(parser->buffer))
499−
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)
513−
514−/*
515− * Copy a character to a string buffer and advance pointers.
516− */
517−
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 --, \
524− 1) : 0)
525−
526−/*
527− * Copy a line break character to a string buffer and advance pointers.
528− */
529−
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), \
567− 1) : 0)
568−
569−/*
570− * Public API declarations.
571− */
572−
573−YAML_DECLARE(int)
574−yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token);
575−
576−/*
577− * Error handling.
578− */
579−
580−static int
581−yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context,
582− yaml_mark_t context_mark, const char *problem);
583−
584−/*
585− * High-level token API.
586− */
587−
588−YAML_DECLARE(int)
589−yaml_parser_fetch_more_tokens(yaml_parser_t *parser);
590−
591−static int
592−yaml_parser_fetch_next_token(yaml_parser_t *parser);
593−
594−/*
595− * Potential simple keys.
596− */
597−
598−static int
599−yaml_parser_stale_simple_keys(yaml_parser_t *parser);
600−
601−static int
602−yaml_parser_save_simple_key(yaml_parser_t *parser);
603−
604−static int
605−yaml_parser_remove_simple_key(yaml_parser_t *parser);
606−
607−static int
608−yaml_parser_increase_flow_level(yaml_parser_t *parser);
609−
610−static int
611−yaml_parser_decrease_flow_level(yaml_parser_t *parser);
612−
613−/*
614− * Indentation treatment.
615− */
616−
617−static int
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);
620−
621−static int
622−yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column);
623−
624−/*
625− * Token fetchers.
626− */
627−
628−static int
629−yaml_parser_fetch_stream_start(yaml_parser_t *parser);
630−
631−static int
632−yaml_parser_fetch_stream_end(yaml_parser_t *parser);
633−
634−static int
635−yaml_parser_fetch_directive(yaml_parser_t *parser);
636−
637−static int
638−yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
639− yaml_token_type_t type);
640−
641−static int
642−yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
643− yaml_token_type_t type);
644−
645−static int
646−yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
647− yaml_token_type_t type);
648−
649−static int
650−yaml_parser_fetch_flow_entry(yaml_parser_t *parser);
651−
652−static int
653−yaml_parser_fetch_block_entry(yaml_parser_t *parser);
654−
655−static int
656−yaml_parser_fetch_key(yaml_parser_t *parser);
657−
658−static int
659−yaml_parser_fetch_value(yaml_parser_t *parser);
660−
661−static int
662−yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type);
663−
664−static int
665−yaml_parser_fetch_tag(yaml_parser_t *parser);
666−
667−static int
668−yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal);
669−
670−static int
671−yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single);
672−
673−static int
674−yaml_parser_fetch_plain_scalar(yaml_parser_t *parser);
675−
676−/*
677− * Token scanners.
678− */
679−
680−static int
681−yaml_parser_scan_to_next_token(yaml_parser_t *parser);
682−
683−static int
684−yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token);
685−
686−static int
687−yaml_parser_scan_directive_name(yaml_parser_t *parser,
688− yaml_mark_t start_mark, yaml_char_t **name);
689−
690−static int
691−yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
692− yaml_mark_t start_mark, int *major, int *minor);
693−
694−static int
695−yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
696− yaml_mark_t start_mark, int *number);
697−
698−static int
699−yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
700− yaml_mark_t mark, yaml_char_t **handle, yaml_char_t **prefix);
701−
702−static int
703−yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
704− yaml_token_type_t type);
705−
706−static int
707−yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token);
708−
709−static int
710−yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
711− yaml_mark_t start_mark, yaml_char_t **handle);
712−
713−static int
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);
716−
717−static int
718−yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
719− yaml_mark_t start_mark, yaml_string_t *string);
720−
721−static int
722−yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
723− int literal);
724−
725−static int
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);
729−
730−static int
731−yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
732− int single);
733−
734−static int
735−yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token);
736−
737−/*
738− * Get the next token.
739− */
740−
741−YAML_DECLARE(int)
742−yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token)
743−{
744− assert(parser); /* Non-NULL parser object is expected. */
745− assert(token); /* Non-NULL token object is expected. */
746−
747− /* Erase the token object. */
748−
749− memset(token, 0, sizeof(yaml_token_t));
750−
751− /* No tokens after STREAM-END or error. */
752−
753− if (parser->stream_end_produced || parser->error) {
754− return 1;
755− }
756−
757− /* Ensure that the tokens queue contains enough tokens. */
758−
759− if (!parser->token_available) {
760− if (!yaml_parser_fetch_more_tokens(parser))
761− return 0;
762− }
763−
764− /* Fetch the next token from the queue. */
765−
766− *token = DEQUEUE(parser, parser->tokens);
767− parser->token_available = 0;
768− parser->tokens_parsed ++;
769−
770− if (token->type == YAML_STREAM_END_TOKEN) {
771− parser->stream_end_produced = 1;
772− }
773−
774− return 1;
775−}
776−
777−/*
778− * Set the scanner error and return 0.
779− */
780−
781−static int
782−yaml_parser_set_scanner_error(yaml_parser_t *parser, const char *context,
783− yaml_mark_t context_mark, const char *problem)
784−{
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;
790−
791− return 0;
792−}
793−
794−/*
795− * Ensure that the tokens queue contains at least one token which can be
796− * returned to the Parser.
797− */
798−
799−YAML_DECLARE(int)
800−yaml_parser_fetch_more_tokens(yaml_parser_t *parser)
801−{
802− int need_more_tokens;
803−
804− /* While we need more tokens to fetch, do it. */
805−
806− while (1)
807− {
808− /*
809− * Check if we really need to fetch more tokens.
810− */
811−
812− need_more_tokens = 0;
813−
814− if (parser->tokens.head == parser->tokens.tail)
815− {
816− /* Queue is empty. */
817−
818− need_more_tokens = 1;
819− }
820− else
821− {
822− yaml_simple_key_t *simple_key;
823−
824− /* Check if any potential simple key may occupy the head position. */
825−
826− if (!yaml_parser_stale_simple_keys(parser))
827− return 0;
828−
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;
834− break;
835− }
836− }
837− }
838−
839− /* We are finished. */
840−
841− if (!need_more_tokens)
842− break;
843−
844− /* Fetch the next token. */
845−
846− if (!yaml_parser_fetch_next_token(parser))
847− return 0;
848− }
849−
850− parser->token_available = 1;
851−
852− return 1;
853−}
854−
855−/*
856− * The dispatcher for token fetchers.
857− */
858−
859−static int
860−yaml_parser_fetch_next_token(yaml_parser_t *parser)
861−{
862− /* Ensure that the buffer is initialized. */
863−
864− if (!CACHE(parser, 1))
865− return 0;
866−
867− /* Check if we just started scanning. Fetch STREAM-START then. */
868−
869− if (!parser->stream_start_produced)
870− return yaml_parser_fetch_stream_start(parser);
871−
872− /* Eat whitespaces and comments until we reach the next token. */
873−
874− if (!yaml_parser_scan_to_next_token(parser))
875− return 0;
876−
877− /* Remove obsolete potential simple keys. */
878−
879− if (!yaml_parser_stale_simple_keys(parser))
880− return 0;
881−
882− /* Check the indentation level against the current column. */
883−
884− if (!yaml_parser_unroll_indent(parser, parser->mark.column))
885− return 0;
886−
887− /*
888− * Ensure that the buffer contains at least 4 characters. 4 is the length
889− * of the longest indicators ('--- ' and '... ').
890− */
891−
892− if (!CACHE(parser, 4))
893− return 0;
894−
895− /* Is it the end of the stream? */
896−
897− if (IS_Z(parser->buffer))
898− return yaml_parser_fetch_stream_end(parser);
899−
900− /* Is it a directive? */
901−
902− if (parser->mark.column == 0 && CHECK(parser->buffer, '%'))
903− return yaml_parser_fetch_directive(parser);
904−
905− /* Is it the document start indicator? */
906−
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);
914−
915− /* Is it the document end indicator? */
916−
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);
924−
925− /* Is it the flow sequence start indicator? */
926−
927− if (CHECK(parser->buffer, '['))
928− return yaml_parser_fetch_flow_collection_start(parser,
929− YAML_FLOW_SEQUENCE_START_TOKEN);
930−
931− /* Is it the flow mapping start indicator? */
932−
933− if (CHECK(parser->buffer, '{'))
934− return yaml_parser_fetch_flow_collection_start(parser,
935− YAML_FLOW_MAPPING_START_TOKEN);
936−
937− /* Is it the flow sequence end indicator? */
938−
939− if (CHECK(parser->buffer, ']'))
940− return yaml_parser_fetch_flow_collection_end(parser,
941− YAML_FLOW_SEQUENCE_END_TOKEN);
942−
943− /* Is it the flow mapping end indicator? */
944−
945− if (CHECK(parser->buffer, '}'))
946− return yaml_parser_fetch_flow_collection_end(parser,
947− YAML_FLOW_MAPPING_END_TOKEN);
948−
949− /* Is it the flow entry indicator? */
950−
951− if (CHECK(parser->buffer, ','))
952− return yaml_parser_fetch_flow_entry(parser);
953−
954− /* Is it the block entry indicator? */
955−
956− if (CHECK(parser->buffer, '-') && IS_BLANKZ_AT(parser->buffer, 1))
957− return yaml_parser_fetch_block_entry(parser);
958−
959− /* Is it the key indicator? */
960−
961− if (CHECK(parser->buffer, '?')
962− && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1)))
963− return yaml_parser_fetch_key(parser);
964−
965− /* Is it the value indicator? */
966−
967− if (CHECK(parser->buffer, ':')
968− && (parser->flow_level || IS_BLANKZ_AT(parser->buffer, 1)))
969− return yaml_parser_fetch_value(parser);
970−
971− /* Is it an alias? */
972−
973− if (CHECK(parser->buffer, '*'))
974− return yaml_parser_fetch_anchor(parser, YAML_ALIAS_TOKEN);
975−
976− /* Is it an anchor? */
977−
978− if (CHECK(parser->buffer, '&'))
979− return yaml_parser_fetch_anchor(parser, YAML_ANCHOR_TOKEN);
980−
981− /* Is it a tag? */
982−
983− if (CHECK(parser->buffer, '!'))
984− return yaml_parser_fetch_tag(parser);
985−
986− /* Is it a literal scalar? */
987−
988− if (CHECK(parser->buffer, '|') && !parser->flow_level)
989− return yaml_parser_fetch_block_scalar(parser, 1);
990−
991− /* Is it a folded scalar? */
992−
993− if (CHECK(parser->buffer, '>') && !parser->flow_level)
994− return yaml_parser_fetch_block_scalar(parser, 0);
995−
996− /* Is it a single-quoted scalar? */
997−
998− if (CHECK(parser->buffer, '\''))
999− return yaml_parser_fetch_flow_scalar(parser, 1);
1000−
1001− /* Is it a double-quoted scalar? */
1002−
1003− if (CHECK(parser->buffer, '"'))
1004− return yaml_parser_fetch_flow_scalar(parser, 0);
1005−
1006− /*
1007− * Is it a plain scalar?
1008− *
1009− * A plain scalar may start with any non-blank characters except
1010− *
1011− * '-', '?', ':', ',', '[', ']', '{', '}',
1012− * '#', '&', '*', '!', '|', '>', '\'', '\"',
1013− * '%', '@', '`'.
1014− *
1015− * In the block context (and, for the '-' indicator, in the flow context
1016− * too), it may also start with the characters
1017− *
1018− * '-', '?', ':'
1019− *
1020− * if it is followed by a non-space character.
1021− *
1022− * The last rule is more restrictive than the specification requires.
1023− */
1024−
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);
1040−
1041− /*
1042− * If we don't determine the token type so far, it is an error.
1043− */
1044−
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");
1048−}
1049−
1050−/*
1051− * Check the list of potential simple keys and remove the positions that
1052− * cannot contain simple keys anymore.
1053− */
1054−
1055−static int
1056−yaml_parser_stale_simple_keys(yaml_parser_t *parser)
1057−{
1058− yaml_simple_key_t *simple_key;
1059−
1060− /* Check for a potential simple key for each flow level. */
1061−
1062− for (simple_key = parser->simple_keys.start;
1063− simple_key != parser->simple_keys.top; simple_key ++)
1064− {
1065− /*
1066− * The specification requires that a simple key
1067− *
1068− * - is limited to a single line,
1069− * - is shorter than 1024 characters.
1070− */
1071−
1072− if (simple_key->possible
1073− && (simple_key->mark.line < parser->mark.line
1074− || simple_key->mark.index+1024 < parser->mark.index)) {
1075−
1076− /* Check if the potential simple key to be removed is required. */
1077−
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 ':'");
1082− }
1083−
1084− simple_key->possible = 0;
1085− }
1086− }
1087−
1088− return 1;
1089−}
1090−
1091−/*
1092− * Check if a simple key may start at the current position and add it if
1093− * needed.
1094− */
1095−
1096−static int
1097−yaml_parser_save_simple_key(yaml_parser_t *parser)
1098−{
1099− /*
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
1102− * level.
1103− */
1104−
1105− int required = (!parser->flow_level
1106− && parser->indent == (ptrdiff_t)parser->mark.column);
1107−
1108− /*
1109− * If the current position may start a simple key, save it.
1110− */
1111−
1112− if (parser->simple_key_allowed)
1113− {
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;
1120−
1121− if (!yaml_parser_remove_simple_key(parser)) return 0;
1122−
1123− *(parser->simple_keys.top-1) = simple_key;
1124− }
1125−
1126− return 1;
1127−}
1128−
1129−/*
1130− * Remove a potential simple key at the current flow level.
1131− */
1132−
1133−static int
1134−yaml_parser_remove_simple_key(yaml_parser_t *parser)
1135−{
1136− yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
1137−
1138− if (simple_key->possible)
1139− {
1140− /* If the key is required, it is an error. */
1141−
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 ':'");
1146− }
1147− }
1148−
1149− /* Remove the key from the stack. */
1150−
1151− simple_key->possible = 0;
1152−
1153− return 1;
1154−}
1155−
1156−/*
1157− * Increase the flow level and resize the simple key list if needed.
1158− */
1159−
1160−static int
1161−yaml_parser_increase_flow_level(yaml_parser_t *parser)
1162−{
1163− yaml_simple_key_t empty_simple_key = { 0, 0, 0, { 0, 0, 0 } };
1164−
1165− /* Reset the simple key on the next level. */
1166−
1167− if (!PUSH(parser, parser->simple_keys, empty_simple_key))
1168− return 0;
1169−
1170− /* Increase the flow level. */
1171−
1172− if (parser->flow_level == INT_MAX) {
1173− parser->error = YAML_MEMORY_ERROR;
1174− return 0;
1175− }
1176−
1177− parser->flow_level++;
1178−
1179− return 1;
1180−}
1181−
1182−/*
1183− * Decrease the flow level.
1184− */
1185−
1186−static int
1187−yaml_parser_decrease_flow_level(yaml_parser_t *parser)
1188−{
1189− yaml_simple_key_t dummy_key; /* Used to eliminate a compiler warning. */
1190−
1191− if (parser->flow_level) {
1192− parser->flow_level --;
1193− dummy_key = POP(parser, parser->simple_keys);
1194− }
1195−
1196− return 1;
1197−}
1198−
1199−/*
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.
1203− *
1204− */
1205−
1206−static int
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)
1209−{
1210− yaml_token_t token;
1211−
1212− /* In the flow context, do nothing. */
1213−
1214− if (parser->flow_level)
1215− return 1;
1216−
1217− if (parser->indent < column)
1218− {
1219− /*
1220− * Push the current indentation level to the stack and set the new
1221− * indentation level.
1222− */
1223−
1224− if (!PUSH(parser, parser->indents, parser->indent))
1225− return 0;
1226−
1227− if (column > INT_MAX) {
1228− parser->error = YAML_MEMORY_ERROR;
1229− return 0;
1230− }
1231−
1232− parser->indent = column;
1233−
1234− /* Create a token and insert it into the queue. */
1235−
1236− TOKEN_INIT(token, type, mark, mark);
1237−
1238− if (number == -1) {
1239− if (!ENQUEUE(parser, parser->tokens, token))
1240− return 0;
1241− }
1242− else {
1243− if (!QUEUE_INSERT(parser,
1244− parser->tokens, number - parser->tokens_parsed, token))
1245− return 0;
1246− }
1247− }
1248−
1249− return 1;
1250−}
1251−
1252−/*
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.
1256− */
1257−
1258−
1259−static int
1260−yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column)
1261−{
1262− yaml_token_t token;
1263−
1264− /* In the flow context, do nothing. */
1265−
1266− if (parser->flow_level)
1267− return 1;
1268−
1269− /* Loop through the indentation levels in the stack. */
1270−
1271− while (parser->indent > column)
1272− {
1273− /* Create a token and append it to the queue. */
1274−
1275− TOKEN_INIT(token, YAML_BLOCK_END_TOKEN, parser->mark, parser->mark);
1276−
1277− if (!ENQUEUE(parser, parser->tokens, token))
1278− return 0;
1279−
1280− /* Pop the indentation level. */
1281−
1282− parser->indent = POP(parser, parser->indents);
1283− }
1284−
1285− return 1;
1286−}
1287−
1288−/*
1289− * Initialize the scanner and produce the STREAM-START token.
1290− */
1291−
1292−static int
1293−yaml_parser_fetch_stream_start(yaml_parser_t *parser)
1294−{
1295− yaml_simple_key_t simple_key = { 0, 0, 0, { 0, 0, 0 } };
1296− yaml_token_t token;
1297−
1298− /* Set the initial indentation. */
1299−
1300− parser->indent = -1;
1301−
1302− /* Initialize the simple key stack. */
1303−
1304− if (!PUSH(parser, parser->simple_keys, simple_key))
1305− return 0;
1306−
1307− /* A simple key is allowed at the beginning of the stream. */
1308−
1309− parser->simple_key_allowed = 1;
1310−
1311− /* We have started. */
1312−
1313− parser->stream_start_produced = 1;
1314−
1315− /* Create the STREAM-START token and append it to the queue. */
1316−
1317− STREAM_START_TOKEN_INIT(token, parser->encoding,
1318− parser->mark, parser->mark);
1319−
1320− if (!ENQUEUE(parser, parser->tokens, token))
1321− return 0;
1322−
1323− return 1;
1324−}
1325−
1326−/*
1327− * Produce the STREAM-END token and shut down the scanner.
1328− */
1329−
1330−static int
1331−yaml_parser_fetch_stream_end(yaml_parser_t *parser)
1332−{
1333− yaml_token_t token;
1334−
1335− /* Force new line. */
1336−
1337− if (parser->mark.column != 0) {
1338− parser->mark.column = 0;
1339− parser->mark.line ++;
1340− }
1341−
1342− /* Reset the indentation level. */
1343−
1344− if (!yaml_parser_unroll_indent(parser, -1))
1345− return 0;
1346−
1347− /* Reset simple keys. */
1348−
1349− if (!yaml_parser_remove_simple_key(parser))
1350− return 0;
1351−
1352− parser->simple_key_allowed = 0;
1353−
1354− /* Create the STREAM-END token and append it to the queue. */
1355−
1356− STREAM_END_TOKEN_INIT(token, parser->mark, parser->mark);
1357−
1358− if (!ENQUEUE(parser, parser->tokens, token))
1359− return 0;
1360−
1361− return 1;
1362−}
1363−
1364−/*
1365− * Produce a VERSION-DIRECTIVE or TAG-DIRECTIVE token.
1366− */
1367−
1368−static int
1369−yaml_parser_fetch_directive(yaml_parser_t *parser)
1370−{
1371− yaml_token_t token;
1372−
1373− /* Reset the indentation level. */
1374−
1375− if (!yaml_parser_unroll_indent(parser, -1))
1376− return 0;
1377−
1378− /* Reset simple keys. */
1379−
1380− if (!yaml_parser_remove_simple_key(parser))
1381− return 0;
1382−
1383− parser->simple_key_allowed = 0;
1384−
1385− /* Create the YAML-DIRECTIVE or TAG-DIRECTIVE token. */
1386−
1387− if (!yaml_parser_scan_directive(parser, &token))
1388− return 0;
1389−
1390− /* Append the token to the queue. */
1391−
1392− if (!ENQUEUE(parser, parser->tokens, token)) {
1393− yaml_token_delete(&token);
1394− return 0;
1395− }
1396−
1397− return 1;
1398−}
1399−
1400−/*
1401− * Produce the DOCUMENT-START or DOCUMENT-END token.
1402− */
1403−
1404−static int
1405−yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
1406− yaml_token_type_t type)
1407−{
1408− yaml_mark_t start_mark, end_mark;
1409− yaml_token_t token;
1410−
1411− /* Reset the indentation level. */
1412−
1413− if (!yaml_parser_unroll_indent(parser, -1))
1414− return 0;
1415−
1416− /* Reset simple keys. */
1417−
1418− if (!yaml_parser_remove_simple_key(parser))
1419− return 0;
1420−
1421− parser->simple_key_allowed = 0;
1422−
1423− /* Consume the token. */
1424−
1425− start_mark = parser->mark;
1426−
1427− SKIP(parser);
1428− SKIP(parser);
1429− SKIP(parser);
1430−
1431− end_mark = parser->mark;
1432−
1433− /* Create the DOCUMENT-START or DOCUMENT-END token. */
1434−
1435− TOKEN_INIT(token, type, start_mark, end_mark);
1436−
1437− /* Append the token to the queue. */
1438−
1439− if (!ENQUEUE(parser, parser->tokens, token))
1440− return 0;
1441−
1442− return 1;
1443−}
1444−
1445−/*
1446− * Produce the FLOW-SEQUENCE-START or FLOW-MAPPING-START token.
1447− */
1448−
1449−static int
1450−yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
1451− yaml_token_type_t type)
1452−{
1453− yaml_mark_t start_mark, end_mark;
1454− yaml_token_t token;
1455−
1456− /* The indicators '[' and '{' may start a simple key. */
1457−
1458− if (!yaml_parser_save_simple_key(parser))
1459− return 0;
1460−
1461− /* Increase the flow level. */
1462−
1463− if (!yaml_parser_increase_flow_level(parser))
1464− return 0;
1465−
1466− /* A simple key may follow the indicators '[' and '{'. */
1467−
1468− parser->simple_key_allowed = 1;
1469−
1470− /* Consume the token. */
1471−
1472− start_mark = parser->mark;
1473− SKIP(parser);
1474− end_mark = parser->mark;
1475−
1476− /* Create the FLOW-SEQUENCE-START of FLOW-MAPPING-START token. */
1477−
1478− TOKEN_INIT(token, type, start_mark, end_mark);
1479−
1480− /* Append the token to the queue. */
1481−
1482− if (!ENQUEUE(parser, parser->tokens, token))
1483− return 0;
1484−
1485− return 1;
1486−}
1487−
1488−/*
1489− * Produce the FLOW-SEQUENCE-END or FLOW-MAPPING-END token.
1490− */
1491−
1492−static int
1493−yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
1494− yaml_token_type_t type)
1495−{
1496− yaml_mark_t start_mark, end_mark;
1497− yaml_token_t token;
1498−
1499− /* Reset any potential simple key on the current flow level. */
1500−
1501− if (!yaml_parser_remove_simple_key(parser))
1502− return 0;
1503−
1504− /* Decrease the flow level. */
1505−
1506− if (!yaml_parser_decrease_flow_level(parser))
1507− return 0;
1508−
1509− /* No simple keys after the indicators ']' and '}'. */
1510−
1511− parser->simple_key_allowed = 0;
1512−
1513− /* Consume the token. */
1514−
1515− start_mark = parser->mark;
1516− SKIP(parser);
1517− end_mark = parser->mark;
1518−
1519− /* Create the FLOW-SEQUENCE-END of FLOW-MAPPING-END token. */
1520−
1521− TOKEN_INIT(token, type, start_mark, end_mark);
1522−
1523− /* Append the token to the queue. */
1524−
1525− if (!ENQUEUE(parser, parser->tokens, token))
1526− return 0;
1527−
1528− return 1;
1529−}
1530−
1531−/*
1532− * Produce the FLOW-ENTRY token.
1533− */
1534−
1535−static int
1536−yaml_parser_fetch_flow_entry(yaml_parser_t *parser)
1537−{
1538− yaml_mark_t start_mark, end_mark;
1539− yaml_token_t token;
1540−
1541− /* Reset any potential simple keys on the current flow level. */
1542−
1543− if (!yaml_parser_remove_simple_key(parser))
1544− return 0;
1545−
1546− /* Simple keys are allowed after ','. */
1547−
1548− parser->simple_key_allowed = 1;
1549−
1550− /* Consume the token. */
1551−
1552− start_mark = parser->mark;
1553− SKIP(parser);
1554− end_mark = parser->mark;
1555−
1556− /* Create the FLOW-ENTRY token and append it to the queue. */
1557−
1558− TOKEN_INIT(token, YAML_FLOW_ENTRY_TOKEN, start_mark, end_mark);
1559−
1560− if (!ENQUEUE(parser, parser->tokens, token))
1561− return 0;
1562−
1563− return 1;
1564−}
1565−
1566−/*
1567− * Produce the BLOCK-ENTRY token.
1568− */
1569−
1570−static int
1571−yaml_parser_fetch_block_entry(yaml_parser_t *parser)
1572−{
1573− yaml_mark_t start_mark, end_mark;
1574− yaml_token_t token;
1575−
1576− /* Check if the scanner is in the block context. */
1577−
1578− if (!parser->flow_level)
1579− {
1580− /* Check if we are allowed to start a new entry. */
1581−
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");
1585− }
1586−
1587− /* Add the BLOCK-SEQUENCE-START token if needed. */
1588−
1589− if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1590− YAML_BLOCK_SEQUENCE_START_TOKEN, parser->mark))
1591− return 0;
1592− }
1593− else
1594− {
1595− /*
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.
1599− */
1600− }
1601−
1602− /* Reset any potential simple keys on the current flow level. */
1603−
1604− if (!yaml_parser_remove_simple_key(parser))
1605− return 0;
1606−
1607− /* Simple keys are allowed after '-'. */
1608−
1609− parser->simple_key_allowed = 1;
1610−
1611− /* Consume the token. */
1612−
1613− start_mark = parser->mark;
1614− SKIP(parser);
1615− end_mark = parser->mark;
1616−
1617− /* Create the BLOCK-ENTRY token and append it to the queue. */
1618−
1619− TOKEN_INIT(token, YAML_BLOCK_ENTRY_TOKEN, start_mark, end_mark);
1620−
1621− if (!ENQUEUE(parser, parser->tokens, token))
1622− return 0;
1623−
1624− return 1;
1625−}
1626−
1627−/*
1628− * Produce the KEY token.
1629− */
1630−
1631−static int
1632−yaml_parser_fetch_key(yaml_parser_t *parser)
1633−{
1634− yaml_mark_t start_mark, end_mark;
1635− yaml_token_t token;
1636−
1637− /* In the block context, additional checks are required. */
1638−
1639− if (!parser->flow_level)
1640− {
1641− /* Check if we are allowed to start a new key (not nessesary simple). */
1642−
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");
1646− }
1647−
1648− /* Add the BLOCK-MAPPING-START token if needed. */
1649−
1650− if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1651− YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
1652− return 0;
1653− }
1654−
1655− /* Reset any potential simple keys on the current flow level. */
1656−
1657− if (!yaml_parser_remove_simple_key(parser))
1658− return 0;
1659−
1660− /* Simple keys are allowed after '?' in the block context. */
1661−
1662− parser->simple_key_allowed = (!parser->flow_level);
1663−
1664− /* Consume the token. */
1665−
1666− start_mark = parser->mark;
1667− SKIP(parser);
1668− end_mark = parser->mark;
1669−
1670− /* Create the KEY token and append it to the queue. */
1671−
1672− TOKEN_INIT(token, YAML_KEY_TOKEN, start_mark, end_mark);
1673−
1674− if (!ENQUEUE(parser, parser->tokens, token))
1675− return 0;
1676−
1677− return 1;
1678−}
1679−
1680−/*
1681− * Produce the VALUE token.
1682− */
1683−
1684−static int
1685−yaml_parser_fetch_value(yaml_parser_t *parser)
1686−{
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;
1690−
1691− /* Have we found a simple key? */
1692−
1693− if (simple_key->possible)
1694− {
1695−
1696− /* Create the KEY token and insert it into the queue. */
1697−
1698− TOKEN_INIT(token, YAML_KEY_TOKEN, simple_key->mark, simple_key->mark);
1699−
1700− if (!QUEUE_INSERT(parser, parser->tokens,
1701− simple_key->token_number - parser->tokens_parsed, token))
1702− return 0;
1703−
1704− /* In the block context, we may need to add the BLOCK-MAPPING-START token. */
1705−
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))
1709− return 0;
1710−
1711− /* Remove the simple key. */
1712−
1713− simple_key->possible = 0;
1714−
1715− /* A simple key cannot follow another simple key. */
1716−
1717− parser->simple_key_allowed = 0;
1718− }
1719− else
1720− {
1721− /* The ':' indicator follows a complex key. */
1722−
1723− /* In the block context, extra checks are required. */
1724−
1725− if (!parser->flow_level)
1726− {
1727− /* Check if we are allowed to start a complex value. */
1728−
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");
1732− }
1733−
1734− /* Add the BLOCK-MAPPING-START token if needed. */
1735−
1736− if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1737− YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
1738− return 0;
1739− }
1740−
1741− /* Simple keys after ':' are allowed in the block context. */
1742−
1743− parser->simple_key_allowed = (!parser->flow_level);
1744− }
1745−
1746− /* Consume the token. */
1747−
1748− start_mark = parser->mark;
1749− SKIP(parser);
1750− end_mark = parser->mark;
1751−
1752− /* Create the VALUE token and append it to the queue. */
1753−
1754− TOKEN_INIT(token, YAML_VALUE_TOKEN, start_mark, end_mark);
1755−
1756− if (!ENQUEUE(parser, parser->tokens, token))
1757− return 0;
1758−
1759− return 1;
1760−}
1761−
1762−/*
1763− * Produce the ALIAS or ANCHOR token.
1764− */
1765−
1766−static int
1767−yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type)
1768−{
1769− yaml_token_t token;
1770−
1771− /* An anchor or an alias could be a simple key. */
1772−
1773− if (!yaml_parser_save_simple_key(parser))
1774− return 0;
1775−
1776− /* A simple key cannot follow an anchor or an alias. */
1777−
1778− parser->simple_key_allowed = 0;
1779−
1780− /* Create the ALIAS or ANCHOR token and append it to the queue. */
1781−
1782− if (!yaml_parser_scan_anchor(parser, &token, type))
1783− return 0;
1784−
1785− if (!ENQUEUE(parser, parser->tokens, token)) {
1786− yaml_token_delete(&token);
1787− return 0;
1788− }
1789− return 1;
1790−}
1791−
1792−/*
1793− * Produce the TAG token.
1794− */
1795−
1796−static int
1797−yaml_parser_fetch_tag(yaml_parser_t *parser)
1798−{
1799− yaml_token_t token;
1800−
1801− /* A tag could be a simple key. */
1802−
1803− if (!yaml_parser_save_simple_key(parser))
1804− return 0;
1805−
1806− /* A simple key cannot follow a tag. */
1807−
1808− parser->simple_key_allowed = 0;
1809−
1810− /* Create the TAG token and append it to the queue. */
1811−
1812− if (!yaml_parser_scan_tag(parser, &token))
1813− return 0;
1814−
1815− if (!ENQUEUE(parser, parser->tokens, token)) {
1816− yaml_token_delete(&token);
1817− return 0;
1818− }
1819−
1820− return 1;
1821−}
1822−
1823−/*
1824− * Produce the SCALAR(...,literal) or SCALAR(...,folded) tokens.
1825− */
1826−
1827−static int
1828−yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal)
1829−{
1830− yaml_token_t token;
1831−
1832− /* Remove any potential simple keys. */
1833−
1834− if (!yaml_parser_remove_simple_key(parser))
1835− return 0;
1836−
1837− /* A simple key may follow a block scalar. */
1838−
1839− parser->simple_key_allowed = 1;
1840−
1841− /* Create the SCALAR token and append it to the queue. */
1842−
1843− if (!yaml_parser_scan_block_scalar(parser, &token, literal))
1844− return 0;
1845−
1846− if (!ENQUEUE(parser, parser->tokens, token)) {
1847− yaml_token_delete(&token);
1848− return 0;
1849− }
1850−
1851− return 1;
1852−}
1853−
1854−/*
1855− * Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens.
1856− */
1857−
1858−static int
1859−yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single)
1860−{
1861− yaml_token_t token;
1862−
1863− /* A plain scalar could be a simple key. */
1864−
1865− if (!yaml_parser_save_simple_key(parser))
1866− return 0;
1867−
1868− /* A simple key cannot follow a flow scalar. */
1869−
1870− parser->simple_key_allowed = 0;
1871−
1872− /* Create the SCALAR token and append it to the queue. */
1873−
1874− if (!yaml_parser_scan_flow_scalar(parser, &token, single))
1875− return 0;
1876−
1877− if (!ENQUEUE(parser, parser->tokens, token)) {
1878− yaml_token_delete(&token);
1879− return 0;
1880− }
1881−
1882− return 1;
1883−}
1884−
1885−/*
1886− * Produce the SCALAR(...,plain) token.
1887− */
1888−
1889−static int
1890−yaml_parser_fetch_plain_scalar(yaml_parser_t *parser)
1891−{
1892− yaml_token_t token;
1893−
1894− /* A plain scalar could be a simple key. */
1895−
1896− if (!yaml_parser_save_simple_key(parser))
1897− return 0;
1898−
1899− /* A simple key cannot follow a flow scalar. */
1900−
1901− parser->simple_key_allowed = 0;
1902−
1903− /* Create the SCALAR token and append it to the queue. */
1904−
1905− if (!yaml_parser_scan_plain_scalar(parser, &token))
1906− return 0;
1907−
1908− if (!ENQUEUE(parser, parser->tokens, token)) {
1909− yaml_token_delete(&token);
1910− return 0;
1911− }
1912−
1913− return 1;
1914−}
1915−
1916−/*
1917− * Eat whitespaces and comments until the next token is found.
1918− */
1919−
1920−static int
1921−yaml_parser_scan_to_next_token(yaml_parser_t *parser)
1922−{
1923− /* Until the next token is not found. */
1924−
1925− while (1)
1926− {
1927− /* Allow the BOM mark to start a line. */
1928−
1929− if (!CACHE(parser, 1)) return 0;
1930−
1931− if (parser->mark.column == 0 && IS_BOM(parser->buffer))
1932− SKIP(parser);
1933−
1934− /*
1935− * Eat whitespaces.
1936− *
1937− * Tabs are allowed:
1938− *
1939− * - in the flow context;
1940− * - in the block context, but not at the beginning of the line or
1941− * after '-', '?', or ':' (complex value).
1942− */
1943−
1944− if (!CACHE(parser, 1)) return 0;
1945−
1946− while (CHECK(parser->buffer,' ') ||
1947− ((parser->flow_level || !parser->simple_key_allowed) &&
1948− CHECK(parser->buffer, '\t'))) {
1949− SKIP(parser);
1950− if (!CACHE(parser, 1)) return 0;
1951− }
1952−
1953− /* Eat a comment until a line break. */
1954−
1955− if (CHECK(parser->buffer, '#')) {
1956− while (!IS_BREAKZ(parser->buffer)) {
1957− SKIP(parser);
1958− if (!CACHE(parser, 1)) return 0;
1959− }
1960− }
1961−
1962− /* If it is a line break, eat it. */
1963−
1964− if (IS_BREAK(parser->buffer))
1965− {
1966− if (!CACHE(parser, 2)) return 0;
1967− SKIP_LINE(parser);
1968−
1969− /* In the block context, a new line may start a simple key. */
1970−
1971− if (!parser->flow_level) {
1972− parser->simple_key_allowed = 1;
1973− }
1974− }
1975− else
1976− {
1977− /* We have found a token. */
1978−
1979− break;
1980− }
1981− }
1982−
1983− return 1;
1984−}
1985−
1986−/*
1987− * Scan a YAML-DIRECTIVE or TAG-DIRECTIVE token.
1988− *
1989− * Scope:
1990− * %YAML 1.1 # a comment \n
1991− * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1992− * %TAG !yaml! tag:yaml.org,2002: \n
1993− * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1994− */
1995−
1996−int
1997−yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token)
1998−{
1999− yaml_mark_t start_mark, end_mark;
2000− yaml_char_t *name = NULL;
2001− int major, minor;
2002− yaml_char_t *handle = NULL, *prefix = NULL;
2003−
2004− /* Eat '%'. */
2005−
2006− start_mark = parser->mark;
2007−
2008− SKIP(parser);
2009−
2010− /* Scan the directive name. */
2011−
2012− if (!yaml_parser_scan_directive_name(parser, start_mark, &name))
2013− goto error;
2014−
2015− /* Is it a YAML directive? */
2016−
2017− if (strcmp((char *)name, "YAML") == 0)
2018− {
2019− /* Scan the VERSION directive value. */
2020−
2021− if (!yaml_parser_scan_version_directive_value(parser, start_mark,
2022− &major, &minor))
2023− goto error;
2024−
2025− end_mark = parser->mark;
2026−
2027− /* Create a VERSION-DIRECTIVE token. */
2028−
2029− VERSION_DIRECTIVE_TOKEN_INIT(*token, major, minor,
2030− start_mark, end_mark);
2031− }
2032−
2033− /* Is it a TAG directive? */
2034−
2035− else if (strcmp((char *)name, "TAG") == 0)
2036− {
2037− /* Scan the TAG directive value. */
2038−
2039− if (!yaml_parser_scan_tag_directive_value(parser, start_mark,
2040− &handle, &prefix))
2041− goto error;
2042−
2043− end_mark = parser->mark;
2044−
2045− /* Create a TAG-DIRECTIVE token. */
2046−
2047− TAG_DIRECTIVE_TOKEN_INIT(*token, handle, prefix,
2048− start_mark, end_mark);
2049− }
2050−
2051− /* Unknown directive. */
2052−
2053− else
2054− {
2055− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2056− start_mark, "found unknown directive name");
2057− goto error;
2058− }
2059−
2060− /* Eat the rest of the line including any comments. */
2061−
2062− if (!CACHE(parser, 1)) goto error;
2063−
2064− while (IS_BLANK(parser->buffer)) {
2065− SKIP(parser);
2066− if (!CACHE(parser, 1)) goto error;
2067− }
2068−
2069− if (CHECK(parser->buffer, '#')) {
2070− while (!IS_BREAKZ(parser->buffer)) {
2071− SKIP(parser);
2072− if (!CACHE(parser, 1)) goto error;
2073− }
2074− }
2075−
2076− /* Check if we are at the end of the line. */
2077−
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");
2081− goto error;
2082− }
2083−
2084− /* Eat a line break. */
2085−
2086− if (IS_BREAK(parser->buffer)) {
2087− if (!CACHE(parser, 2)) goto error;
2088− SKIP_LINE(parser);
2089− }
2090−
2091− yaml_free(name);
2092−
2093− return 1;
2094−
2095−error:
2096− yaml_free(prefix);
2097− yaml_free(handle);
2098− yaml_free(name);
2099− return 0;
2100−}
2101−
2102−/*
2103− * Scan the directive name.
2104− *
2105− * Scope:
2106− * %YAML 1.1 # a comment \n
2107− * ^^^^
2108− * %TAG !yaml! tag:yaml.org,2002: \n
2109− * ^^^
2110− */
2111−
2112−static int
2113−yaml_parser_scan_directive_name(yaml_parser_t *parser,
2114− yaml_mark_t start_mark, yaml_char_t **name)
2115−{
2116− yaml_string_t string = NULL_STRING;
2117−
2118− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2119−
2120− /* Consume the directive name. */
2121−
2122− if (!CACHE(parser, 1)) goto error;
2123−
2124− while (IS_ALPHA(parser->buffer))
2125− {
2126− if (!READ(parser, string)) goto error;
2127− if (!CACHE(parser, 1)) goto error;
2128− }
2129−
2130− /* Check if the name is empty. */
2131−
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");
2135− goto error;
2136− }
2137−
2138− /* Check for an blank character after the name. */
2139−
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");
2143− goto error;
2144− }
2145−
2146− *name = string.start;
2147−
2148− return 1;
2149−
2150−error:
2151− STRING_DEL(parser, string);
2152− return 0;
2153−}
2154−
2155−/*
2156− * Scan the value of VERSION-DIRECTIVE.
2157− *
2158− * Scope:
2159− * %YAML 1.1 # a comment \n
2160− * ^^^^^^
2161− */
2162−
2163−static int
2164−yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
2165− yaml_mark_t start_mark, int *major, int *minor)
2166−{
2167− /* Eat whitespaces. */
2168−
2169− if (!CACHE(parser, 1)) return 0;
2170−
2171− while (IS_BLANK(parser->buffer)) {
2172− SKIP(parser);
2173− if (!CACHE(parser, 1)) return 0;
2174− }
2175−
2176− /* Consume the major version number. */
2177−
2178− if (!yaml_parser_scan_version_directive_number(parser, start_mark, major))
2179− return 0;
2180−
2181− /* Eat '.'. */
2182−
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");
2186− }
2187−
2188− SKIP(parser);
2189−
2190− /* Consume the minor version number. */
2191−
2192− if (!yaml_parser_scan_version_directive_number(parser, start_mark, minor))
2193− return 0;
2194−
2195− return 1;
2196−}
2197−
2198−#define MAX_NUMBER_LENGTH 9
2199−
2200−/*
2201− * Scan the version number of VERSION-DIRECTIVE.
2202− *
2203− * Scope:
2204− * %YAML 1.1 # a comment \n
2205− * ^
2206− * %YAML 1.1 # a comment \n
2207− * ^
2208− */
2209−
2210−static int
2211−yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
2212− yaml_mark_t start_mark, int *number)
2213−{
2214− int value = 0;
2215− size_t length = 0;
2216−
2217− /* Repeat while the next character is digit. */
2218−
2219− if (!CACHE(parser, 1)) return 0;
2220−
2221− while (IS_DIGIT(parser->buffer))
2222− {
2223− /* Check if the number is too long. */
2224−
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");
2228− }
2229−
2230− value = value*10 + AS_DIGIT(parser->buffer);
2231−
2232− SKIP(parser);
2233−
2234− if (!CACHE(parser, 1)) return 0;
2235− }
2236−
2237− /* Check if the number was present. */
2238−
2239− if (!length) {
2240− return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2241− start_mark, "did not find expected version number");
2242− }
2243−
2244− *number = value;
2245−
2246− return 1;
2247−}
2248−
2249−/*
2250− * Scan the value of a TAG-DIRECTIVE token.
2251− *
2252− * Scope:
2253− * %TAG !yaml! tag:yaml.org,2002: \n
2254− * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2255− */
2256−
2257−static int
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)
2260−{
2261− yaml_char_t *handle_value = NULL;
2262− yaml_char_t *prefix_value = NULL;
2263−
2264− /* Eat whitespaces. */
2265−
2266− if (!CACHE(parser, 1)) goto error;
2267−
2268− while (IS_BLANK(parser->buffer)) {
2269− SKIP(parser);
2270− if (!CACHE(parser, 1)) goto error;
2271− }
2272−
2273− /* Scan a handle. */
2274−
2275− if (!yaml_parser_scan_tag_handle(parser, 1, start_mark, &handle_value))
2276− goto error;
2277−
2278− /* Expect a whitespace. */
2279−
2280− if (!CACHE(parser, 1)) goto error;
2281−
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");
2285− goto error;
2286− }
2287−
2288− /* Eat whitespaces. */
2289−
2290− while (IS_BLANK(parser->buffer)) {
2291− SKIP(parser);
2292− if (!CACHE(parser, 1)) goto error;
2293− }
2294−
2295− /* Scan a prefix. */
2296−
2297− if (!yaml_parser_scan_tag_uri(parser, 1, NULL, start_mark, &prefix_value))
2298− goto error;
2299−
2300− /* Expect a whitespace or line break. */
2301−
2302− if (!CACHE(parser, 1)) goto error;
2303−
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");
2307− goto error;
2308− }
2309−
2310− *handle = handle_value;
2311− *prefix = prefix_value;
2312−
2313− return 1;
2314−
2315−error:
2316− yaml_free(handle_value);
2317− yaml_free(prefix_value);
2318− return 0;
2319−}
2320−
2321−static int
2322−yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
2323− yaml_token_type_t type)
2324−{
2325− int length = 0;
2326− yaml_mark_t start_mark, end_mark;
2327− yaml_string_t string = NULL_STRING;
2328−
2329− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2330−
2331− /* Eat the indicator character. */
2332−
2333− start_mark = parser->mark;
2334−
2335− SKIP(parser);
2336−
2337− /* Consume the value. */
2338−
2339− if (!CACHE(parser, 1)) goto error;
2340−
2341− while (IS_ALPHA(parser->buffer)) {
2342− if (!READ(parser, string)) goto error;
2343− if (!CACHE(parser, 1)) goto error;
2344− length ++;
2345− }
2346−
2347− end_mark = parser->mark;
2348−
2349− /*
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:
2352− *
2353− * '?', ':', ',', ']', '}', '%', '@', '`'.
2354− */
2355−
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");
2364− goto error;
2365− }
2366−
2367− /* Create a token. */
2368−
2369− if (type == YAML_ANCHOR_TOKEN) {
2370− ANCHOR_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2371− }
2372− else {
2373− ALIAS_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2374− }
2375−
2376− return 1;
2377−
2378−error:
2379− STRING_DEL(parser, string);
2380− return 0;
2381−}
2382−
2383−/*
2384− * Scan a TAG token.
2385− */
2386−
2387−static int
2388−yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token)
2389−{
2390− yaml_char_t *handle = NULL;
2391− yaml_char_t *suffix = NULL;
2392− yaml_mark_t start_mark, end_mark;
2393−
2394− start_mark = parser->mark;
2395−
2396− /* Check if the tag is in the canonical form. */
2397−
2398− if (!CACHE(parser, 2)) goto error;
2399−
2400− if (CHECK_AT(parser->buffer, '<', 1))
2401− {
2402− /* Set the handle to '' */
2403−
2404− handle = yaml_malloc(1);
2405− if (!handle) goto error;
2406− handle[0] = '\0';
2407−
2408− /* Eat '!<' */
2409−
2410− SKIP(parser);
2411− SKIP(parser);
2412−
2413− /* Consume the tag value. */
2414−
2415− if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2416− goto error;
2417−
2418− /* Check for '>' and eat it. */
2419−
2420− if (!CHECK(parser->buffer, '>')) {
2421− yaml_parser_set_scanner_error(parser, "while scanning a tag",
2422− start_mark, "did not find the expected '>'");
2423− goto error;
2424− }
2425−
2426− SKIP(parser);
2427− }
2428− else
2429− {
2430− /* The tag has either the '!suffix' or the '!handle!suffix' form. */
2431−
2432− /* First, try to scan a handle. */
2433−
2434− if (!yaml_parser_scan_tag_handle(parser, 0, start_mark, &handle))
2435− goto error;
2436−
2437− /* Check if it is, indeed, handle. */
2438−
2439− if (handle[0] == '!' && handle[1] != '\0' && handle[strlen((char *)handle)-1] == '!')
2440− {
2441− /* Scan the suffix now. */
2442−
2443− if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2444− goto error;
2445− }
2446− else
2447− {
2448− /* It wasn't a handle after all. Scan the rest of the tag. */
2449−
2450− if (!yaml_parser_scan_tag_uri(parser, 0, handle, start_mark, &suffix))
2451− goto error;
2452−
2453− /* Set the handle to '!'. */
2454−
2455− yaml_free(handle);
2456− handle = yaml_malloc(2);
2457− if (!handle) goto error;
2458− handle[0] = '!';
2459− handle[1] = '\0';
2460−
2461− /*
2462− * A special case: the '!' tag. Set the handle to '' and the
2463− * suffix to '!'.
2464− */
2465−
2466− if (suffix[0] == '\0') {
2467− yaml_char_t *tmp = handle;
2468− handle = suffix;
2469− suffix = tmp;
2470− }
2471− }
2472− }
2473−
2474− /* Check the character which ends the tag. */
2475−
2476− if (!CACHE(parser, 1)) goto error;
2477−
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");
2481− goto error;
2482− }
2483−
2484− end_mark = parser->mark;
2485−
2486− /* Create a token. */
2487−
2488− TAG_TOKEN_INIT(*token, handle, suffix, start_mark, end_mark);
2489−
2490− return 1;
2491−
2492−error:
2493− yaml_free(handle);
2494− yaml_free(suffix);
2495− return 0;
2496−}
2497−
2498−/*
2499− * Scan a tag handle.
2500− */
2501−
2502−static int
2503−yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
2504− yaml_mark_t start_mark, yaml_char_t **handle)
2505−{
2506− yaml_string_t string = NULL_STRING;
2507−
2508− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2509−
2510− /* Check the initial '!' character. */
2511−
2512− if (!CACHE(parser, 1)) goto error;
2513−
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 '!'");
2518− goto error;
2519− }
2520−
2521− /* Copy the '!' character. */
2522−
2523− if (!READ(parser, string)) goto error;
2524−
2525− /* Copy all subsequent alphabetical and numerical characters. */
2526−
2527− if (!CACHE(parser, 1)) goto error;
2528−
2529− while (IS_ALPHA(parser->buffer))
2530− {
2531− if (!READ(parser, string)) goto error;
2532− if (!CACHE(parser, 1)) goto error;
2533− }
2534−
2535− /* Check if the trailing character is '!' and copy it. */
2536−
2537− if (CHECK(parser->buffer, '!'))
2538− {
2539− if (!READ(parser, string)) goto error;
2540− }
2541− else
2542− {
2543− /*
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
2546− * URI.
2547− */
2548−
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 '!'");
2552− goto error;
2553− }
2554− }
2555−
2556− *handle = string.start;
2557−
2558− return 1;
2559−
2560−error:
2561− STRING_DEL(parser, string);
2562− return 0;
2563−}
2564−
2565−/*
2566− * Scan a tag.
2567− */
2568−
2569−static int
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)
2572−{
2573− size_t length = head ? strlen((char *)head) : 0;
2574− yaml_string_t string = NULL_STRING;
2575−
2576− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2577−
2578− /* Resize the string to include the head. */
2579−
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;
2583− goto error;
2584− }
2585− }
2586−
2587− /*
2588− * Copy the head if needed.
2589− *
2590− * Note that we don't copy the leading '!' character.
2591− */
2592−
2593− if (length > 1) {
2594− memcpy(string.start, head+1, length-1);
2595− string.pointer += length-1;
2596− }
2597−
2598− /* Scan the tag. */
2599−
2600− if (!CACHE(parser, 1)) goto error;
2601−
2602− /*
2603− * The set of characters that may appear in URI is as follows:
2604− *
2605− * '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&',
2606− * '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']',
2607− * '%'.
2608− */
2609−
2610− while (IS_ALPHA(parser->buffer) || CHECK(parser->buffer, ';')
2611− || CHECK(parser->buffer, '/') || CHECK(parser->buffer, '?')
2612− || CHECK(parser->buffer, ':') || CHECK(parser->buffer, '@')
2613− || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '=')
2614− || CHECK(parser->buffer, '+') || CHECK(parser->buffer, '$')
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, '%'))
2621− {
2622− /* Check if it is a URI-escape sequence. */
2623−
2624− if (CHECK(parser->buffer, '%')) {
2625− if (!STRING_EXTEND(parser, string))
2626− goto error;
2627−
2628− if (!yaml_parser_scan_uri_escapes(parser,
2629− directive, start_mark, &string)) goto error;
2630− }
2631− else {
2632− if (!READ(parser, string)) goto error;
2633− }
2634−
2635− length ++;
2636− if (!CACHE(parser, 1)) goto error;
2637− }
2638−
2639− /* Check if the tag is non-empty. */
2640−
2641− if (!length) {
2642− if (!STRING_EXTEND(parser, string))
2643− goto error;
2644−
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");
2648− goto error;
2649− }
2650−
2651− *uri = string.start;
2652−
2653− return 1;
2654−
2655−error:
2656− STRING_DEL(parser, string);
2657− return 0;
2658−}
2659−
2660−/*
2661− * Decode an URI-escape sequence corresponding to a single UTF-8 character.
2662− */
2663−
2664−static int
2665−yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
2666− yaml_mark_t start_mark, yaml_string_t *string)
2667−{
2668− int width = 0;
2669−
2670− /* Decode the required number of characters. */
2671−
2672− do {
2673−
2674− unsigned char octet = 0;
2675−
2676− /* Check for a URI-escaped octet. */
2677−
2678− if (!CACHE(parser, 3)) return 0;
2679−
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");
2686− }
2687−
2688− /* Get the octet. */
2689−
2690− octet = (AS_HEX_AT(parser->buffer, 1) << 4) + AS_HEX_AT(parser->buffer, 2);
2691−
2692− /* If it is the leading octet, determine the length of the UTF-8 sequence. */
2693−
2694− if (!width)
2695− {
2696− width = (octet & 0x80) == 0x00 ? 1 :
2697− (octet & 0xE0) == 0xC0 ? 2 :
2698− (octet & 0xF0) == 0xE0 ? 3 :
2699− (octet & 0xF8) == 0xF0 ? 4 : 0;
2700− if (!width) {
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");
2704− }
2705− }
2706− else
2707− {
2708− /* Check if the trailing octet is correct. */
2709−
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");
2714− }
2715− }
2716−
2717− /* Copy the octet and move the pointers. */
2718−
2719− *(string->pointer++) = octet;
2720− SKIP(parser);
2721− SKIP(parser);
2722− SKIP(parser);
2723−
2724− } while (--width);
2725−
2726− return 1;
2727−}
2728−
2729−/*
2730− * Scan a block scalar.
2731− */
2732−
2733−static int
2734−yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
2735− int literal)
2736−{
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;
2742− int chomping = 0;
2743− int increment = 0;
2744− int indent = 0;
2745− int leading_blank = 0;
2746− int trailing_blank = 0;
2747−
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;
2751−
2752− /* Eat the indicator '|' or '>'. */
2753−
2754− start_mark = parser->mark;
2755−
2756− SKIP(parser);
2757−
2758− /* Scan the additional block scalar indicators. */
2759−
2760− if (!CACHE(parser, 1)) goto error;
2761−
2762− /* Check for a chomping indicator. */
2763−
2764− if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-'))
2765− {
2766− /* Set the chomping method and eat the indicator. */
2767−
2768− chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2769−
2770− SKIP(parser);
2771−
2772− /* Check for an indentation indicator. */
2773−
2774− if (!CACHE(parser, 1)) goto error;
2775−
2776− if (IS_DIGIT(parser->buffer))
2777− {
2778− /* Check that the indentation is greater than 0. */
2779−
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");
2783− goto error;
2784− }
2785−
2786− /* Get the indentation level and eat the indicator. */
2787−
2788− increment = AS_DIGIT(parser->buffer);
2789−
2790− SKIP(parser);
2791− }
2792− }
2793−
2794− /* Do the same as above, but in the opposite order. */
2795−
2796− else if (IS_DIGIT(parser->buffer))
2797− {
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");
2801− goto error;
2802− }
2803−
2804− increment = AS_DIGIT(parser->buffer);
2805−
2806− SKIP(parser);
2807−
2808− if (!CACHE(parser, 1)) goto error;
2809−
2810− if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) {
2811− chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2812−
2813− SKIP(parser);
2814− }
2815− }
2816−
2817− /* Eat whitespaces and comments to the end of the line. */
2818−
2819− if (!CACHE(parser, 1)) goto error;
2820−
2821− while (IS_BLANK(parser->buffer)) {
2822− SKIP(parser);
2823− if (!CACHE(parser, 1)) goto error;
2824− }
2825−
2826− if (CHECK(parser->buffer, '#')) {
2827− while (!IS_BREAKZ(parser->buffer)) {
2828− SKIP(parser);
2829− if (!CACHE(parser, 1)) goto error;
2830− }
2831− }
2832−
2833− /* Check if we are at the end of the line. */
2834−
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");
2838− goto error;
2839− }
2840−
2841− /* Eat a line break. */
2842−
2843− if (IS_BREAK(parser->buffer)) {
2844− if (!CACHE(parser, 2)) goto error;
2845− SKIP_LINE(parser);
2846− }
2847−
2848− end_mark = parser->mark;
2849−
2850− /* Set the indentation level if it was specified. */
2851−
2852− if (increment) {
2853− indent = parser->indent >= 0 ? parser->indent+increment : increment;
2854− }
2855−
2856− /* Scan the leading line breaks and determine the indentation level if needed. */
2857−
2858− if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks,
2859− start_mark, &end_mark)) goto error;
2860−
2861− /* Scan the block scalar content. */
2862−
2863− if (!CACHE(parser, 1)) goto error;
2864−
2865− while ((int)parser->mark.column == indent && !IS_Z(parser->buffer))
2866− {
2867− /*
2868− * We are at the beginning of a non-empty line.
2869− */
2870−
2871− /* Is it a trailing whitespace? */
2872−
2873− trailing_blank = IS_BLANK(parser->buffer);
2874−
2875− /* Check if we need to fold the leading line break. */
2876−
2877− if (!literal && (*leading_break.start == '\n')
2878− && !leading_blank && !trailing_blank)
2879− {
2880− /* Do we need to join the lines by space? */
2881−
2882− if (*trailing_breaks.start == '\0') {
2883− if (!STRING_EXTEND(parser, string)) goto error;
2884− *(string.pointer ++) = ' ';
2885− }
2886−
2887− CLEAR(parser, leading_break);
2888− }
2889− else {
2890− if (!JOIN(parser, string, leading_break)) goto error;
2891− CLEAR(parser, leading_break);
2892− }
2893−
2894− /* Append the remaining line breaks. */
2895−
2896− if (!JOIN(parser, string, trailing_breaks)) goto error;
2897− CLEAR(parser, trailing_breaks);
2898−
2899− /* Is it a leading whitespace? */
2900−
2901− leading_blank = IS_BLANK(parser->buffer);
2902−
2903− /* Consume the current line. */
2904−
2905− while (!IS_BREAKZ(parser->buffer)) {
2906− if (!READ(parser, string)) goto error;
2907− if (!CACHE(parser, 1)) goto error;
2908− }
2909−
2910− /* Consume the line break. */
2911−
2912− if (!CACHE(parser, 2)) goto error;
2913−
2914− if (!READ_LINE(parser, leading_break)) goto error;
2915−
2916− /* Eat the following indentation spaces and line breaks. */
2917−
2918− if (!yaml_parser_scan_block_scalar_breaks(parser,
2919− &indent, &trailing_breaks, start_mark, &end_mark)) goto error;
2920− }
2921−
2922− /* Chomp the tail. */
2923−
2924− if (chomping != -1) {
2925− if (!JOIN(parser, string, leading_break)) goto error;
2926− }
2927− if (chomping == 1) {
2928− if (!JOIN(parser, string, trailing_breaks)) goto error;
2929− }
2930−
2931− /* Create a token. */
2932−
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);
2936−
2937− STRING_DEL(parser, leading_break);
2938− STRING_DEL(parser, trailing_breaks);
2939−
2940− return 1;
2941−
2942−error:
2943− STRING_DEL(parser, string);
2944− STRING_DEL(parser, leading_break);
2945− STRING_DEL(parser, trailing_breaks);
2946−
2947− return 0;
2948−}
2949−
2950−/*
2951− * Scan indentation spaces and line breaks for a block scalar. Determine the
2952− * indentation level if needed.
2953− */
2954−
2955−static int
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)
2959−{
2960− int max_indent = 0;
2961−
2962− *end_mark = parser->mark;
2963−
2964− /* Eat the indentation spaces and line breaks. */
2965−
2966− while (1)
2967− {
2968− /* Eat the indentation spaces. */
2969−
2970− if (!CACHE(parser, 1)) return 0;
2971−
2972− while ((!*indent || (int)parser->mark.column < *indent)
2973− && IS_SPACE(parser->buffer)) {
2974− SKIP(parser);
2975− if (!CACHE(parser, 1)) return 0;
2976− }
2977−
2978− if ((int)parser->mark.column > max_indent)
2979− max_indent = (int)parser->mark.column;
2980−
2981− /* Check for a tab character messing the indentation. */
2982−
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");
2987− }
2988−
2989− /* Have we found a non-empty line? */
2990−
2991− if (!IS_BREAK(parser->buffer)) break;
2992−
2993− /* Consume the line break. */
2994−
2995− if (!CACHE(parser, 2)) return 0;
2996− if (!READ_LINE(parser, *breaks)) return 0;
2997− *end_mark = parser->mark;
2998− }
2999−
3000− /* Determine the indentation level if needed. */
3001−
3002− if (!*indent) {
3003− *indent = max_indent;
3004− if (*indent < parser->indent + 1)
3005− *indent = parser->indent + 1;
3006− if (*indent < 1)
3007− *indent = 1;
3008− }
3009−
3010− return 1;
3011−}
3012−
3013−/*
3014− * Scan a quoted scalar.
3015− */
3016−
3017−static int
3018−yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
3019− int single)
3020−{
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;
3028−
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;
3033−
3034− /* Eat the left quote. */
3035−
3036− start_mark = parser->mark;
3037−
3038− SKIP(parser);
3039−
3040− /* Consume the content of the quoted scalar. */
3041−
3042− while (1)
3043− {
3044− /* Check that there are no document indicators at the beginning of the line. */
3045−
3046− if (!CACHE(parser, 4)) goto error;
3047−
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))
3056− {
3057− yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3058− start_mark, "found unexpected document indicator");
3059− goto error;
3060− }
3061−
3062− /* Check for EOF. */
3063−
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");
3067− goto error;
3068− }
3069−
3070− /* Consume non-blank characters. */
3071−
3072− if (!CACHE(parser, 2)) goto error;
3073−
3074− leading_blanks = 0;
3075−
3076− while (!IS_BLANKZ(parser->buffer))
3077− {
3078− /* Check for an escaped single quote. */
3079−
3080− if (single && CHECK_AT(parser->buffer, '\'', 0)
3081− && CHECK_AT(parser->buffer, '\'', 1))
3082− {
3083− if (!STRING_EXTEND(parser, string)) goto error;
3084− *(string.pointer++) = '\'';
3085− SKIP(parser);
3086− SKIP(parser);
3087− }
3088−
3089− /* Check for the right quote. */
3090−
3091− else if (CHECK(parser->buffer, single ? '\'' : '"'))
3092− {
3093− break;
3094− }
3095−
3096− /* Check for an escaped line break. */
3097−
3098− else if (!single && CHECK(parser->buffer, '\\')
3099− && IS_BREAK_AT(parser->buffer, 1))
3100− {
3101− if (!CACHE(parser, 3)) goto error;
3102− SKIP(parser);
3103− SKIP_LINE(parser);
3104− leading_blanks = 1;
3105− break;
3106− }
3107−
3108− /* Check for an escape sequence. */
3109−
3110− else if (!single && CHECK(parser->buffer, '\\'))
3111− {
3112− size_t code_length = 0;
3113−
3114− if (!STRING_EXTEND(parser, string)) goto error;
3115−
3116− /* Check the escape character. */
3117−
3118− switch (parser->buffer.pointer[1])
3119− {
3120− case '0':
3121− *(string.pointer++) = '\0';
3122− break;
3123−
3124− case 'a':
3125− *(string.pointer++) = '\x07';
3126− break;
3127−
3128− case 'b':
3129− *(string.pointer++) = '\x08';
3130− break;
3131−
3132− case 't':
3133− case '\t':
3134− *(string.pointer++) = '\x09';
3135− break;
3136−
3137− case 'n':
3138− *(string.pointer++) = '\x0A';
3139− break;
3140−
3141− case 'v':
3142− *(string.pointer++) = '\x0B';
3143− break;
3144−
3145− case 'f':
3146− *(string.pointer++) = '\x0C';
3147− break;
3148−
3149− case 'r':
3150− *(string.pointer++) = '\x0D';
3151− break;
3152−
3153− case 'e':
3154− *(string.pointer++) = '\x1B';
3155− break;
3156−
3157− case ' ':
3158− *(string.pointer++) = '\x20';
3159− break;
3160−
3161− case '"':
3162− *(string.pointer++) = '"';
3163− break;
3164−
3165− case '/':
3166− *(string.pointer++) = '/';
3167− break;
3168−
3169− case '\'':
3170− *(string.pointer++) = '\'';
3171− break;
3172−
3173− case '\\':
3174− *(string.pointer++) = '\\';
3175− break;
3176−
3177− case 'N': /* NEL (#x85) */
3178− *(string.pointer++) = '\xC2';
3179− *(string.pointer++) = '\x85';
3180− break;
3181−
3182− case '_': /* #xA0 */
3183− *(string.pointer++) = '\xC2';
3184− *(string.pointer++) = '\xA0';
3185− break;
3186−
3187− case 'L': /* LS (#x2028) */
3188− *(string.pointer++) = '\xE2';
3189− *(string.pointer++) = '\x80';
3190− *(string.pointer++) = '\xA8';
3191− break;
3192−
3193− case 'P': /* PS (#x2029) */
3194− *(string.pointer++) = '\xE2';
3195− *(string.pointer++) = '\x80';
3196− *(string.pointer++) = '\xA9';
3197− break;
3198−
3199− case 'x':
3200− code_length = 2;
3201− break;
3202−
3203− case 'u':
3204− code_length = 4;
3205− break;
3206−
3207− case 'U':
3208− code_length = 8;
3209− break;
3210−
3211− default:
3212− yaml_parser_set_scanner_error(parser, "while parsing a quoted scalar",
3213− start_mark, "found unknown escape character");
3214− goto error;
3215− }
3216−
3217− SKIP(parser);
3218− SKIP(parser);
3219−
3220− /* Consume an arbitrary escape code. */
3221−
3222− if (code_length)
3223− {
3224− unsigned int value = 0;
3225− size_t k;
3226−
3227− /* Scan the character value. */
3228−
3229− if (!CACHE(parser, code_length)) goto error;
3230−
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");
3235− goto error;
3236− }
3237− value = (value << 4) + AS_HEX_AT(parser->buffer, k);
3238− }
3239−
3240− /* Check the value and write the character. */
3241−
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");
3245− goto error;
3246− }
3247−
3248− if (value <= 0x7F) {
3249− *(string.pointer++) = value;
3250− }
3251− else if (value <= 0x7FF) {
3252− *(string.pointer++) = 0xC0 + (value >> 6);
3253− *(string.pointer++) = 0x80 + (value & 0x3F);
3254− }
3255− else if (value <= 0xFFFF) {
3256− *(string.pointer++) = 0xE0 + (value >> 12);
3257− *(string.pointer++) = 0x80 + ((value >> 6) & 0x3F);
3258− *(string.pointer++) = 0x80 + (value & 0x3F);
3259− }
3260− else {
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);
3265− }
3266−
3267− /* Advance the pointer. */
3268−
3269− for (k = 0; k < code_length; k ++) {
3270− SKIP(parser);
3271− }
3272− }
3273− }
3274−
3275− else
3276− {
3277− /* It is a non-escaped non-blank character. */
3278−
3279− if (!READ(parser, string)) goto error;
3280− }
3281−
3282− if (!CACHE(parser, 2)) goto error;
3283− }
3284−
3285− /* Check if we are at the end of the scalar. */
3286−
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
3290− */
3291− if (!CACHE(parser, 1)) goto error;
3292− if (CHECK(parser->buffer, single ? '\'' : '"'))
3293− break;
3294−
3295− /* Consume blank characters. */
3296−
3297− if (!CACHE(parser, 1)) goto error;
3298−
3299− while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3300− {
3301− if (IS_BLANK(parser->buffer))
3302− {
3303− /* Consume a space or a tab character. */
3304−
3305− if (!leading_blanks) {
3306− if (!READ(parser, whitespaces)) goto error;
3307− }
3308− else {
3309− SKIP(parser);
3310− }
3311− }
3312− else
3313− {
3314− if (!CACHE(parser, 2)) goto error;
3315−
3316− /* Check if it is a first line break. */
3317−
3318− if (!leading_blanks)
3319− {
3320− CLEAR(parser, whitespaces);
3321− if (!READ_LINE(parser, leading_break)) goto error;
3322− leading_blanks = 1;
3323− }
3324− else
3325− {
3326− if (!READ_LINE(parser, trailing_breaks)) goto error;
3327− }
3328− }
3329− if (!CACHE(parser, 1)) goto error;
3330− }
3331−
3332− /* Join the whitespaces or fold line breaks. */
3333−
3334− if (leading_blanks)
3335− {
3336− /* Do we need to fold line breaks? */
3337−
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++) = ' ';
3342− }
3343− else {
3344− if (!JOIN(parser, string, trailing_breaks)) goto error;
3345− CLEAR(parser, trailing_breaks);
3346− }
3347− CLEAR(parser, leading_break);
3348− }
3349− else {
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);
3354− }
3355− }
3356− else
3357− {
3358− if (!JOIN(parser, string, whitespaces)) goto error;
3359− CLEAR(parser, whitespaces);
3360− }
3361− }
3362−
3363− /* Eat the right quote. */
3364−
3365− SKIP(parser);
3366−
3367− end_mark = parser->mark;
3368−
3369− /* Create a token. */
3370−
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);
3374−
3375− STRING_DEL(parser, leading_break);
3376− STRING_DEL(parser, trailing_breaks);
3377− STRING_DEL(parser, whitespaces);
3378−
3379− return 1;
3380−
3381−error:
3382− STRING_DEL(parser, string);
3383− STRING_DEL(parser, leading_break);
3384− STRING_DEL(parser, trailing_breaks);
3385− STRING_DEL(parser, whitespaces);
3386−
3387− return 0;
3388−}
3389−
3390−/*
3391− * Scan a plain scalar.
3392− */
3393−
3394−static int
3395−yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token)
3396−{
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;
3405−
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;
3410−
3411− start_mark = end_mark = parser->mark;
3412−
3413− /* Consume the content of the plain scalar. */
3414−
3415− while (1)
3416− {
3417− /* Check for a document indicator. */
3418−
3419− if (!CACHE(parser, 4)) goto error;
3420−
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;
3429−
3430− /* Check for a comment. */
3431−
3432− if (CHECK(parser->buffer, '#'))
3433− break;
3434−
3435− /* Consume non-blank characters. */
3436−
3437− while (!IS_BLANKZ(parser->buffer))
3438− {
3439− /* Check for 'x:x' in the flow context. TODO: Fix the test "spec-08-13". */
3440−
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 ':'");
3446− goto error;
3447− }
3448−
3449− /* Check for indicators that may end a plain scalar. */
3450−
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, '}'))))
3457− break;
3458−
3459− /* Check if we need to join whitespaces and breaks. */
3460−
3461− if (leading_blanks || whitespaces.start != whitespaces.pointer)
3462− {
3463− if (leading_blanks)
3464− {
3465− /* Do we need to fold line breaks? */
3466−
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++) = ' ';
3471− }
3472− else {
3473− if (!JOIN(parser, string, trailing_breaks)) goto error;
3474− CLEAR(parser, trailing_breaks);
3475− }
3476− CLEAR(parser, leading_break);
3477− }
3478− else {
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);
3483− }
3484−
3485− leading_blanks = 0;
3486− }
3487− else
3488− {
3489− if (!JOIN(parser, string, whitespaces)) goto error;
3490− CLEAR(parser, whitespaces);
3491− }
3492− }
3493−
3494− /* Copy the character. */
3495−
3496− if (!READ(parser, string)) goto error;
3497−
3498− end_mark = parser->mark;
3499−
3500− if (!CACHE(parser, 2)) goto error;
3501− }
3502−
3503− /* Is it the end? */
3504−
3505− if (!(IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)))
3506− break;
3507−
3508− /* Consume blank characters. */
3509−
3510− if (!CACHE(parser, 1)) goto error;
3511−
3512− while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3513− {
3514− if (IS_BLANK(parser->buffer))
3515− {
3516− /* Check for tab character that abuse indentation. */
3517−
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");
3522− goto error;
3523− }
3524−
3525− /* Consume a space or a tab character. */
3526−
3527− if (!leading_blanks) {
3528− if (!READ(parser, whitespaces)) goto error;
3529− }
3530− else {
3531− SKIP(parser);
3532− }
3533− }
3534− else
3535− {
3536− if (!CACHE(parser, 2)) goto error;
3537−
3538− /* Check if it is a first line break. */
3539−
3540− if (!leading_blanks)
3541− {
3542− CLEAR(parser, whitespaces);
3543− if (!READ_LINE(parser, leading_break)) goto error;
3544− leading_blanks = 1;
3545− }
3546− else
3547− {
3548− if (!READ_LINE(parser, trailing_breaks)) goto error;
3549− }
3550− }
3551− if (!CACHE(parser, 1)) goto error;
3552− }
3553−
3554− /* Check indentation level. */
3555−
3556− if (!parser->flow_level && (int)parser->mark.column < indent)
3557− break;
3558− }
3559−
3560− /* Create a token. */
3561−
3562− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3563− YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark);
3564−
3565− /* Note that we change the 'simple_key_allowed' flag. */
3566−
3567− if (leading_blanks) {
3568− parser->simple_key_allowed = 1;
3569− }
3570−
3571− STRING_DEL(parser, leading_break);
3572− STRING_DEL(parser, trailing_breaks);
3573− STRING_DEL(parser, whitespaces);
3574−
3575− return 1;
3576−
3577−error:
3578− STRING_DEL(parser, string);
3579− STRING_DEL(parser, leading_break);
3580− STRING_DEL(parser, trailing_breaks);
3581− STRING_DEL(parser, whitespaces);
3582−
3583− return 0;
3584−}