@@ -1,3580 +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 correspoding 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− * A simple key is required only when it is the first token in the current
1110− * line. Therefore it is always allowed. But we add a check anyway.
1111− */
1112−
1113− assert(parser->simple_key_allowed || !required); /* Impossible. */
1114−
1115− /*
1116− * If the current position may start a simple key, save it.
1117− */
1118−
1119− if (parser->simple_key_allowed)
1120− {
1121− yaml_simple_key_t simple_key;
1122− simple_key.possible = 1;
1123− simple_key.required = required;
1124− simple_key.token_number =
1125− parser->tokens_parsed + (parser->tokens.tail - parser->tokens.head);
1126− simple_key.mark = parser->mark;
1127−
1128− if (!yaml_parser_remove_simple_key(parser)) return 0;
1129−
1130− *(parser->simple_keys.top-1) = simple_key;
1131− }
1132−
1133− return 1;
1134−}
1135−
1136−/*
1137− * Remove a potential simple key at the current flow level.
1138− */
1139−
1140−static int
1141−yaml_parser_remove_simple_key(yaml_parser_t *parser)
1142−{
1143− yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
1144−
1145− if (simple_key->possible)
1146− {
1147− /* If the key is required, it is an error. */
1148−
1149− if (simple_key->required) {
1150− return yaml_parser_set_scanner_error(parser,
1151− "while scanning a simple key", simple_key->mark,
1152− "could not find expected ':'");
1153− }
1154− }
1155−
1156− /* Remove the key from the stack. */
1157−
1158− simple_key->possible = 0;
1159−
1160− return 1;
1161−}
1162−
1163−/*
1164− * Increase the flow level and resize the simple key list if needed.
1165− */
1166−
1167−static int
1168−yaml_parser_increase_flow_level(yaml_parser_t *parser)
1169−{
1170− yaml_simple_key_t empty_simple_key = { 0, 0, 0, { 0, 0, 0 } };
1171−
1172− /* Reset the simple key on the next level. */
1173−
1174− if (!PUSH(parser, parser->simple_keys, empty_simple_key))
1175− return 0;
1176−
1177− /* Increase the flow level. */
1178−
1179− if (parser->flow_level == INT_MAX) {
1180− parser->error = YAML_MEMORY_ERROR;
1181− return 0;
1182− }
1183−
1184− parser->flow_level++;
1185−
1186− return 1;
1187−}
1188−
1189−/*
1190− * Decrease the flow level.
1191− */
1192−
1193−static int
1194−yaml_parser_decrease_flow_level(yaml_parser_t *parser)
1195−{
1196− yaml_simple_key_t dummy_key; /* Used to eliminate a compiler warning. */
1197−
1198− if (parser->flow_level) {
1199− parser->flow_level --;
1200− dummy_key = POP(parser, parser->simple_keys);
1201− }
1202−
1203− return 1;
1204−}
1205−
1206−/*
1207− * Push the current indentation level to the stack and set the new level
1208− * the current column is greater than the indentation level. In this case,
1209− * append or insert the specified token into the token queue.
1210− *
1211− */
1212−
1213−static int
1214−yaml_parser_roll_indent(yaml_parser_t *parser, ptrdiff_t column,
1215− ptrdiff_t number, yaml_token_type_t type, yaml_mark_t mark)
1216−{
1217− yaml_token_t token;
1218−
1219− /* In the flow context, do nothing. */
1220−
1221− if (parser->flow_level)
1222− return 1;
1223−
1224− if (parser->indent < column)
1225− {
1226− /*
1227− * Push the current indentation level to the stack and set the new
1228− * indentation level.
1229− */
1230−
1231− if (!PUSH(parser, parser->indents, parser->indent))
1232− return 0;
1233−
1234− if (column > INT_MAX) {
1235− parser->error = YAML_MEMORY_ERROR;
1236− return 0;
1237− }
1238−
1239− parser->indent = column;
1240−
1241− /* Create a token and insert it into the queue. */
1242−
1243− TOKEN_INIT(token, type, mark, mark);
1244−
1245− if (number == -1) {
1246− if (!ENQUEUE(parser, parser->tokens, token))
1247− return 0;
1248− }
1249− else {
1250− if (!QUEUE_INSERT(parser,
1251− parser->tokens, number - parser->tokens_parsed, token))
1252− return 0;
1253− }
1254− }
1255−
1256− return 1;
1257−}
1258−
1259−/*
1260− * Pop indentation levels from the indents stack until the current level
1261− * becomes less or equal to the column. For each intendation level, append
1262− * the BLOCK-END token.
1263− */
1264−
1265−
1266−static int
1267−yaml_parser_unroll_indent(yaml_parser_t *parser, ptrdiff_t column)
1268−{
1269− yaml_token_t token;
1270−
1271− /* In the flow context, do nothing. */
1272−
1273− if (parser->flow_level)
1274− return 1;
1275−
1276− /* Loop through the intendation levels in the stack. */
1277−
1278− while (parser->indent > column)
1279− {
1280− /* Create a token and append it to the queue. */
1281−
1282− TOKEN_INIT(token, YAML_BLOCK_END_TOKEN, parser->mark, parser->mark);
1283−
1284− if (!ENQUEUE(parser, parser->tokens, token))
1285− return 0;
1286−
1287− /* Pop the indentation level. */
1288−
1289− parser->indent = POP(parser, parser->indents);
1290− }
1291−
1292− return 1;
1293−}
1294−
1295−/*
1296− * Initialize the scanner and produce the STREAM-START token.
1297− */
1298−
1299−static int
1300−yaml_parser_fetch_stream_start(yaml_parser_t *parser)
1301−{
1302− yaml_simple_key_t simple_key = { 0, 0, 0, { 0, 0, 0 } };
1303− yaml_token_t token;
1304−
1305− /* Set the initial indentation. */
1306−
1307− parser->indent = -1;
1308−
1309− /* Initialize the simple key stack. */
1310−
1311− if (!PUSH(parser, parser->simple_keys, simple_key))
1312− return 0;
1313−
1314− /* A simple key is allowed at the beginning of the stream. */
1315−
1316− parser->simple_key_allowed = 1;
1317−
1318− /* We have started. */
1319−
1320− parser->stream_start_produced = 1;
1321−
1322− /* Create the STREAM-START token and append it to the queue. */
1323−
1324− STREAM_START_TOKEN_INIT(token, parser->encoding,
1325− parser->mark, parser->mark);
1326−
1327− if (!ENQUEUE(parser, parser->tokens, token))
1328− return 0;
1329−
1330− return 1;
1331−}
1332−
1333−/*
1334− * Produce the STREAM-END token and shut down the scanner.
1335− */
1336−
1337−static int
1338−yaml_parser_fetch_stream_end(yaml_parser_t *parser)
1339−{
1340− yaml_token_t token;
1341−
1342− /* Force new line. */
1343−
1344− if (parser->mark.column != 0) {
1345− parser->mark.column = 0;
1346− parser->mark.line ++;
1347− }
1348−
1349− /* Reset the indentation level. */
1350−
1351− if (!yaml_parser_unroll_indent(parser, -1))
1352− return 0;
1353−
1354− /* Reset simple keys. */
1355−
1356− if (!yaml_parser_remove_simple_key(parser))
1357− return 0;
1358−
1359− parser->simple_key_allowed = 0;
1360−
1361− /* Create the STREAM-END token and append it to the queue. */
1362−
1363− STREAM_END_TOKEN_INIT(token, parser->mark, parser->mark);
1364−
1365− if (!ENQUEUE(parser, parser->tokens, token))
1366− return 0;
1367−
1368− return 1;
1369−}
1370−
1371−/*
1372− * Produce a VERSION-DIRECTIVE or TAG-DIRECTIVE token.
1373− */
1374−
1375−static int
1376−yaml_parser_fetch_directive(yaml_parser_t *parser)
1377−{
1378− yaml_token_t token;
1379−
1380− /* Reset the indentation level. */
1381−
1382− if (!yaml_parser_unroll_indent(parser, -1))
1383− return 0;
1384−
1385− /* Reset simple keys. */
1386−
1387− if (!yaml_parser_remove_simple_key(parser))
1388− return 0;
1389−
1390− parser->simple_key_allowed = 0;
1391−
1392− /* Create the YAML-DIRECTIVE or TAG-DIRECTIVE token. */
1393−
1394− if (!yaml_parser_scan_directive(parser, &token))
1395− return 0;
1396−
1397− /* Append the token to the queue. */
1398−
1399− if (!ENQUEUE(parser, parser->tokens, token)) {
1400− yaml_token_delete(&token);
1401− return 0;
1402− }
1403−
1404− return 1;
1405−}
1406−
1407−/*
1408− * Produce the DOCUMENT-START or DOCUMENT-END token.
1409− */
1410−
1411−static int
1412−yaml_parser_fetch_document_indicator(yaml_parser_t *parser,
1413− yaml_token_type_t type)
1414−{
1415− yaml_mark_t start_mark, end_mark;
1416− yaml_token_t token;
1417−
1418− /* Reset the indentation level. */
1419−
1420− if (!yaml_parser_unroll_indent(parser, -1))
1421− return 0;
1422−
1423− /* Reset simple keys. */
1424−
1425− if (!yaml_parser_remove_simple_key(parser))
1426− return 0;
1427−
1428− parser->simple_key_allowed = 0;
1429−
1430− /* Consume the token. */
1431−
1432− start_mark = parser->mark;
1433−
1434− SKIP(parser);
1435− SKIP(parser);
1436− SKIP(parser);
1437−
1438− end_mark = parser->mark;
1439−
1440− /* Create the DOCUMENT-START or DOCUMENT-END token. */
1441−
1442− TOKEN_INIT(token, type, start_mark, end_mark);
1443−
1444− /* Append the token to the queue. */
1445−
1446− if (!ENQUEUE(parser, parser->tokens, token))
1447− return 0;
1448−
1449− return 1;
1450−}
1451−
1452−/*
1453− * Produce the FLOW-SEQUENCE-START or FLOW-MAPPING-START token.
1454− */
1455−
1456−static int
1457−yaml_parser_fetch_flow_collection_start(yaml_parser_t *parser,
1458− yaml_token_type_t type)
1459−{
1460− yaml_mark_t start_mark, end_mark;
1461− yaml_token_t token;
1462−
1463− /* The indicators '[' and '{' may start a simple key. */
1464−
1465− if (!yaml_parser_save_simple_key(parser))
1466− return 0;
1467−
1468− /* Increase the flow level. */
1469−
1470− if (!yaml_parser_increase_flow_level(parser))
1471− return 0;
1472−
1473− /* A simple key may follow the indicators '[' and '{'. */
1474−
1475− parser->simple_key_allowed = 1;
1476−
1477− /* Consume the token. */
1478−
1479− start_mark = parser->mark;
1480− SKIP(parser);
1481− end_mark = parser->mark;
1482−
1483− /* Create the FLOW-SEQUENCE-START of FLOW-MAPPING-START token. */
1484−
1485− TOKEN_INIT(token, type, start_mark, end_mark);
1486−
1487− /* Append the token to the queue. */
1488−
1489− if (!ENQUEUE(parser, parser->tokens, token))
1490− return 0;
1491−
1492− return 1;
1493−}
1494−
1495−/*
1496− * Produce the FLOW-SEQUENCE-END or FLOW-MAPPING-END token.
1497− */
1498−
1499−static int
1500−yaml_parser_fetch_flow_collection_end(yaml_parser_t *parser,
1501− yaml_token_type_t type)
1502−{
1503− yaml_mark_t start_mark, end_mark;
1504− yaml_token_t token;
1505−
1506− /* Reset any potential simple key on the current flow level. */
1507−
1508− if (!yaml_parser_remove_simple_key(parser))
1509− return 0;
1510−
1511− /* Decrease the flow level. */
1512−
1513− if (!yaml_parser_decrease_flow_level(parser))
1514− return 0;
1515−
1516− /* No simple keys after the indicators ']' and '}'. */
1517−
1518− parser->simple_key_allowed = 0;
1519−
1520− /* Consume the token. */
1521−
1522− start_mark = parser->mark;
1523− SKIP(parser);
1524− end_mark = parser->mark;
1525−
1526− /* Create the FLOW-SEQUENCE-END of FLOW-MAPPING-END token. */
1527−
1528− TOKEN_INIT(token, type, start_mark, end_mark);
1529−
1530− /* Append the token to the queue. */
1531−
1532− if (!ENQUEUE(parser, parser->tokens, token))
1533− return 0;
1534−
1535− return 1;
1536−}
1537−
1538−/*
1539− * Produce the FLOW-ENTRY token.
1540− */
1541−
1542−static int
1543−yaml_parser_fetch_flow_entry(yaml_parser_t *parser)
1544−{
1545− yaml_mark_t start_mark, end_mark;
1546− yaml_token_t token;
1547−
1548− /* Reset any potential simple keys on the current flow level. */
1549−
1550− if (!yaml_parser_remove_simple_key(parser))
1551− return 0;
1552−
1553− /* Simple keys are allowed after ','. */
1554−
1555− parser->simple_key_allowed = 1;
1556−
1557− /* Consume the token. */
1558−
1559− start_mark = parser->mark;
1560− SKIP(parser);
1561− end_mark = parser->mark;
1562−
1563− /* Create the FLOW-ENTRY token and append it to the queue. */
1564−
1565− TOKEN_INIT(token, YAML_FLOW_ENTRY_TOKEN, start_mark, end_mark);
1566−
1567− if (!ENQUEUE(parser, parser->tokens, token))
1568− return 0;
1569−
1570− return 1;
1571−}
1572−
1573−/*
1574− * Produce the BLOCK-ENTRY token.
1575− */
1576−
1577−static int
1578−yaml_parser_fetch_block_entry(yaml_parser_t *parser)
1579−{
1580− yaml_mark_t start_mark, end_mark;
1581− yaml_token_t token;
1582−
1583− /* Check if the scanner is in the block context. */
1584−
1585− if (!parser->flow_level)
1586− {
1587− /* Check if we are allowed to start a new entry. */
1588−
1589− if (!parser->simple_key_allowed) {
1590− return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1591− "block sequence entries are not allowed in this context");
1592− }
1593−
1594− /* Add the BLOCK-SEQUENCE-START token if needed. */
1595−
1596− if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1597− YAML_BLOCK_SEQUENCE_START_TOKEN, parser->mark))
1598− return 0;
1599− }
1600− else
1601− {
1602− /*
1603− * It is an error for the '-' indicator to occur in the flow context,
1604− * but we let the Parser detect and report about it because the Parser
1605− * is able to point to the context.
1606− */
1607− }
1608−
1609− /* Reset any potential simple keys on the current flow level. */
1610−
1611− if (!yaml_parser_remove_simple_key(parser))
1612− return 0;
1613−
1614− /* Simple keys are allowed after '-'. */
1615−
1616− parser->simple_key_allowed = 1;
1617−
1618− /* Consume the token. */
1619−
1620− start_mark = parser->mark;
1621− SKIP(parser);
1622− end_mark = parser->mark;
1623−
1624− /* Create the BLOCK-ENTRY token and append it to the queue. */
1625−
1626− TOKEN_INIT(token, YAML_BLOCK_ENTRY_TOKEN, start_mark, end_mark);
1627−
1628− if (!ENQUEUE(parser, parser->tokens, token))
1629− return 0;
1630−
1631− return 1;
1632−}
1633−
1634−/*
1635− * Produce the KEY token.
1636− */
1637−
1638−static int
1639−yaml_parser_fetch_key(yaml_parser_t *parser)
1640−{
1641− yaml_mark_t start_mark, end_mark;
1642− yaml_token_t token;
1643−
1644− /* In the block context, additional checks are required. */
1645−
1646− if (!parser->flow_level)
1647− {
1648− /* Check if we are allowed to start a new key (not nessesary simple). */
1649−
1650− if (!parser->simple_key_allowed) {
1651− return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1652− "mapping keys are not allowed in this context");
1653− }
1654−
1655− /* Add the BLOCK-MAPPING-START token if needed. */
1656−
1657− if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1658− YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
1659− return 0;
1660− }
1661−
1662− /* Reset any potential simple keys on the current flow level. */
1663−
1664− if (!yaml_parser_remove_simple_key(parser))
1665− return 0;
1666−
1667− /* Simple keys are allowed after '?' in the block context. */
1668−
1669− parser->simple_key_allowed = (!parser->flow_level);
1670−
1671− /* Consume the token. */
1672−
1673− start_mark = parser->mark;
1674− SKIP(parser);
1675− end_mark = parser->mark;
1676−
1677− /* Create the KEY token and append it to the queue. */
1678−
1679− TOKEN_INIT(token, YAML_KEY_TOKEN, start_mark, end_mark);
1680−
1681− if (!ENQUEUE(parser, parser->tokens, token))
1682− return 0;
1683−
1684− return 1;
1685−}
1686−
1687−/*
1688− * Produce the VALUE token.
1689− */
1690−
1691−static int
1692−yaml_parser_fetch_value(yaml_parser_t *parser)
1693−{
1694− yaml_mark_t start_mark, end_mark;
1695− yaml_token_t token;
1696− yaml_simple_key_t *simple_key = parser->simple_keys.top-1;
1697−
1698− /* Have we found a simple key? */
1699−
1700− if (simple_key->possible)
1701− {
1702−
1703− /* Create the KEY token and insert it into the queue. */
1704−
1705− TOKEN_INIT(token, YAML_KEY_TOKEN, simple_key->mark, simple_key->mark);
1706−
1707− if (!QUEUE_INSERT(parser, parser->tokens,
1708− simple_key->token_number - parser->tokens_parsed, token))
1709− return 0;
1710−
1711− /* In the block context, we may need to add the BLOCK-MAPPING-START token. */
1712−
1713− if (!yaml_parser_roll_indent(parser, simple_key->mark.column,
1714− simple_key->token_number,
1715− YAML_BLOCK_MAPPING_START_TOKEN, simple_key->mark))
1716− return 0;
1717−
1718− /* Remove the simple key. */
1719−
1720− simple_key->possible = 0;
1721−
1722− /* A simple key cannot follow another simple key. */
1723−
1724− parser->simple_key_allowed = 0;
1725− }
1726− else
1727− {
1728− /* The ':' indicator follows a complex key. */
1729−
1730− /* In the block context, extra checks are required. */
1731−
1732− if (!parser->flow_level)
1733− {
1734− /* Check if we are allowed to start a complex value. */
1735−
1736− if (!parser->simple_key_allowed) {
1737− return yaml_parser_set_scanner_error(parser, NULL, parser->mark,
1738− "mapping values are not allowed in this context");
1739− }
1740−
1741− /* Add the BLOCK-MAPPING-START token if needed. */
1742−
1743− if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
1744− YAML_BLOCK_MAPPING_START_TOKEN, parser->mark))
1745− return 0;
1746− }
1747−
1748− /* Simple keys after ':' are allowed in the block context. */
1749−
1750− parser->simple_key_allowed = (!parser->flow_level);
1751− }
1752−
1753− /* Consume the token. */
1754−
1755− start_mark = parser->mark;
1756− SKIP(parser);
1757− end_mark = parser->mark;
1758−
1759− /* Create the VALUE token and append it to the queue. */
1760−
1761− TOKEN_INIT(token, YAML_VALUE_TOKEN, start_mark, end_mark);
1762−
1763− if (!ENQUEUE(parser, parser->tokens, token))
1764− return 0;
1765−
1766− return 1;
1767−}
1768−
1769−/*
1770− * Produce the ALIAS or ANCHOR token.
1771− */
1772−
1773−static int
1774−yaml_parser_fetch_anchor(yaml_parser_t *parser, yaml_token_type_t type)
1775−{
1776− yaml_token_t token;
1777−
1778− /* An anchor or an alias could be a simple key. */
1779−
1780− if (!yaml_parser_save_simple_key(parser))
1781− return 0;
1782−
1783− /* A simple key cannot follow an anchor or an alias. */
1784−
1785− parser->simple_key_allowed = 0;
1786−
1787− /* Create the ALIAS or ANCHOR token and append it to the queue. */
1788−
1789− if (!yaml_parser_scan_anchor(parser, &token, type))
1790− return 0;
1791−
1792− if (!ENQUEUE(parser, parser->tokens, token)) {
1793− yaml_token_delete(&token);
1794− return 0;
1795− }
1796− return 1;
1797−}
1798−
1799−/*
1800− * Produce the TAG token.
1801− */
1802−
1803−static int
1804−yaml_parser_fetch_tag(yaml_parser_t *parser)
1805−{
1806− yaml_token_t token;
1807−
1808− /* A tag could be a simple key. */
1809−
1810− if (!yaml_parser_save_simple_key(parser))
1811− return 0;
1812−
1813− /* A simple key cannot follow a tag. */
1814−
1815− parser->simple_key_allowed = 0;
1816−
1817− /* Create the TAG token and append it to the queue. */
1818−
1819− if (!yaml_parser_scan_tag(parser, &token))
1820− return 0;
1821−
1822− if (!ENQUEUE(parser, parser->tokens, token)) {
1823− yaml_token_delete(&token);
1824− return 0;
1825− }
1826−
1827− return 1;
1828−}
1829−
1830−/*
1831− * Produce the SCALAR(...,literal) or SCALAR(...,folded) tokens.
1832− */
1833−
1834−static int
1835−yaml_parser_fetch_block_scalar(yaml_parser_t *parser, int literal)
1836−{
1837− yaml_token_t token;
1838−
1839− /* Remove any potential simple keys. */
1840−
1841− if (!yaml_parser_remove_simple_key(parser))
1842− return 0;
1843−
1844− /* A simple key may follow a block scalar. */
1845−
1846− parser->simple_key_allowed = 1;
1847−
1848− /* Create the SCALAR token and append it to the queue. */
1849−
1850− if (!yaml_parser_scan_block_scalar(parser, &token, literal))
1851− return 0;
1852−
1853− if (!ENQUEUE(parser, parser->tokens, token)) {
1854− yaml_token_delete(&token);
1855− return 0;
1856− }
1857−
1858− return 1;
1859−}
1860−
1861−/*
1862− * Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens.
1863− */
1864−
1865−static int
1866−yaml_parser_fetch_flow_scalar(yaml_parser_t *parser, int single)
1867−{
1868− yaml_token_t token;
1869−
1870− /* A plain scalar could be a simple key. */
1871−
1872− if (!yaml_parser_save_simple_key(parser))
1873− return 0;
1874−
1875− /* A simple key cannot follow a flow scalar. */
1876−
1877− parser->simple_key_allowed = 0;
1878−
1879− /* Create the SCALAR token and append it to the queue. */
1880−
1881− if (!yaml_parser_scan_flow_scalar(parser, &token, single))
1882− return 0;
1883−
1884− if (!ENQUEUE(parser, parser->tokens, token)) {
1885− yaml_token_delete(&token);
1886− return 0;
1887− }
1888−
1889− return 1;
1890−}
1891−
1892−/*
1893− * Produce the SCALAR(...,plain) token.
1894− */
1895−
1896−static int
1897−yaml_parser_fetch_plain_scalar(yaml_parser_t *parser)
1898−{
1899− yaml_token_t token;
1900−
1901− /* A plain scalar could be a simple key. */
1902−
1903− if (!yaml_parser_save_simple_key(parser))
1904− return 0;
1905−
1906− /* A simple key cannot follow a flow scalar. */
1907−
1908− parser->simple_key_allowed = 0;
1909−
1910− /* Create the SCALAR token and append it to the queue. */
1911−
1912− if (!yaml_parser_scan_plain_scalar(parser, &token))
1913− return 0;
1914−
1915− if (!ENQUEUE(parser, parser->tokens, token)) {
1916− yaml_token_delete(&token);
1917− return 0;
1918− }
1919−
1920− return 1;
1921−}
1922−
1923−/*
1924− * Eat whitespaces and comments until the next token is found.
1925− */
1926−
1927−static int
1928−yaml_parser_scan_to_next_token(yaml_parser_t *parser)
1929−{
1930− /* Until the next token is not found. */
1931−
1932− while (1)
1933− {
1934− /* Allow the BOM mark to start a line. */
1935−
1936− if (!CACHE(parser, 1)) return 0;
1937−
1938− if (parser->mark.column == 0 && IS_BOM(parser->buffer))
1939− SKIP(parser);
1940−
1941− /*
1942− * Eat whitespaces.
1943− *
1944− * Tabs are allowed:
1945− *
1946− * - in the flow context;
1947− * - in the block context, but not at the beginning of the line or
1948− * after '-', '?', or ':' (complex value).
1949− */
1950−
1951− if (!CACHE(parser, 1)) return 0;
1952−
1953− while (CHECK(parser->buffer,' ') ||
1954− ((parser->flow_level || !parser->simple_key_allowed) &&
1955− CHECK(parser->buffer, '\t'))) {
1956− SKIP(parser);
1957− if (!CACHE(parser, 1)) return 0;
1958− }
1959−
1960− /* Eat a comment until a line break. */
1961−
1962− if (CHECK(parser->buffer, '#')) {
1963− while (!IS_BREAKZ(parser->buffer)) {
1964− SKIP(parser);
1965− if (!CACHE(parser, 1)) return 0;
1966− }
1967− }
1968−
1969− /* If it is a line break, eat it. */
1970−
1971− if (IS_BREAK(parser->buffer))
1972− {
1973− if (!CACHE(parser, 2)) return 0;
1974− SKIP_LINE(parser);
1975−
1976− /* In the block context, a new line may start a simple key. */
1977−
1978− if (!parser->flow_level) {
1979− parser->simple_key_allowed = 1;
1980− }
1981− }
1982− else
1983− {
1984− /* We have found a token. */
1985−
1986− break;
1987− }
1988− }
1989−
1990− return 1;
1991−}
1992−
1993−/*
1994− * Scan a YAML-DIRECTIVE or TAG-DIRECTIVE token.
1995− *
1996− * Scope:
1997− * %YAML 1.1 # a comment \n
1998− * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1999− * %TAG !yaml! tag:yaml.org,2002: \n
2000− * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2001− */
2002−
2003−int
2004−yaml_parser_scan_directive(yaml_parser_t *parser, yaml_token_t *token)
2005−{
2006− yaml_mark_t start_mark, end_mark;
2007− yaml_char_t *name = NULL;
2008− int major, minor;
2009− yaml_char_t *handle = NULL, *prefix = NULL;
2010−
2011− /* Eat '%'. */
2012−
2013− start_mark = parser->mark;
2014−
2015− SKIP(parser);
2016−
2017− /* Scan the directive name. */
2018−
2019− if (!yaml_parser_scan_directive_name(parser, start_mark, &name))
2020− goto error;
2021−
2022− /* Is it a YAML directive? */
2023−
2024− if (strcmp((char *)name, "YAML") == 0)
2025− {
2026− /* Scan the VERSION directive value. */
2027−
2028− if (!yaml_parser_scan_version_directive_value(parser, start_mark,
2029− &major, &minor))
2030− goto error;
2031−
2032− end_mark = parser->mark;
2033−
2034− /* Create a VERSION-DIRECTIVE token. */
2035−
2036− VERSION_DIRECTIVE_TOKEN_INIT(*token, major, minor,
2037− start_mark, end_mark);
2038− }
2039−
2040− /* Is it a TAG directive? */
2041−
2042− else if (strcmp((char *)name, "TAG") == 0)
2043− {
2044− /* Scan the TAG directive value. */
2045−
2046− if (!yaml_parser_scan_tag_directive_value(parser, start_mark,
2047− &handle, &prefix))
2048− goto error;
2049−
2050− end_mark = parser->mark;
2051−
2052− /* Create a TAG-DIRECTIVE token. */
2053−
2054− TAG_DIRECTIVE_TOKEN_INIT(*token, handle, prefix,
2055− start_mark, end_mark);
2056− }
2057−
2058− /* Unknown directive. */
2059−
2060− else
2061− {
2062− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2063− start_mark, "found uknown directive name");
2064− goto error;
2065− }
2066−
2067− /* Eat the rest of the line including any comments. */
2068−
2069− if (!CACHE(parser, 1)) goto error;
2070−
2071− while (IS_BLANK(parser->buffer)) {
2072− SKIP(parser);
2073− if (!CACHE(parser, 1)) goto error;
2074− }
2075−
2076− if (CHECK(parser->buffer, '#')) {
2077− while (!IS_BREAKZ(parser->buffer)) {
2078− SKIP(parser);
2079− if (!CACHE(parser, 1)) goto error;
2080− }
2081− }
2082−
2083− /* Check if we are at the end of the line. */
2084−
2085− if (!IS_BREAKZ(parser->buffer)) {
2086− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2087− start_mark, "did not find expected comment or line break");
2088− goto error;
2089− }
2090−
2091− /* Eat a line break. */
2092−
2093− if (IS_BREAK(parser->buffer)) {
2094− if (!CACHE(parser, 2)) goto error;
2095− SKIP_LINE(parser);
2096− }
2097−
2098− yaml_free(name);
2099−
2100− return 1;
2101−
2102−error:
2103− yaml_free(prefix);
2104− yaml_free(handle);
2105− yaml_free(name);
2106− return 0;
2107−}
2108−
2109−/*
2110− * Scan the directive name.
2111− *
2112− * Scope:
2113− * %YAML 1.1 # a comment \n
2114− * ^^^^
2115− * %TAG !yaml! tag:yaml.org,2002: \n
2116− * ^^^
2117− */
2118−
2119−static int
2120−yaml_parser_scan_directive_name(yaml_parser_t *parser,
2121− yaml_mark_t start_mark, yaml_char_t **name)
2122−{
2123− yaml_string_t string = NULL_STRING;
2124−
2125− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2126−
2127− /* Consume the directive name. */
2128−
2129− if (!CACHE(parser, 1)) goto error;
2130−
2131− while (IS_ALPHA(parser->buffer))
2132− {
2133− if (!READ(parser, string)) goto error;
2134− if (!CACHE(parser, 1)) goto error;
2135− }
2136−
2137− /* Check if the name is empty. */
2138−
2139− if (string.start == string.pointer) {
2140− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2141− start_mark, "could not find expected directive name");
2142− goto error;
2143− }
2144−
2145− /* Check for an blank character after the name. */
2146−
2147− if (!IS_BLANKZ(parser->buffer)) {
2148− yaml_parser_set_scanner_error(parser, "while scanning a directive",
2149− start_mark, "found unexpected non-alphabetical character");
2150− goto error;
2151− }
2152−
2153− *name = string.start;
2154−
2155− return 1;
2156−
2157−error:
2158− STRING_DEL(parser, string);
2159− return 0;
2160−}
2161−
2162−/*
2163− * Scan the value of VERSION-DIRECTIVE.
2164− *
2165− * Scope:
2166− * %YAML 1.1 # a comment \n
2167− * ^^^^^^
2168− */
2169−
2170−static int
2171−yaml_parser_scan_version_directive_value(yaml_parser_t *parser,
2172− yaml_mark_t start_mark, int *major, int *minor)
2173−{
2174− /* Eat whitespaces. */
2175−
2176− if (!CACHE(parser, 1)) return 0;
2177−
2178− while (IS_BLANK(parser->buffer)) {
2179− SKIP(parser);
2180− if (!CACHE(parser, 1)) return 0;
2181− }
2182−
2183− /* Consume the major version number. */
2184−
2185− if (!yaml_parser_scan_version_directive_number(parser, start_mark, major))
2186− return 0;
2187−
2188− /* Eat '.'. */
2189−
2190− if (!CHECK(parser->buffer, '.')) {
2191− return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2192− start_mark, "did not find expected digit or '.' character");
2193− }
2194−
2195− SKIP(parser);
2196−
2197− /* Consume the minor version number. */
2198−
2199− if (!yaml_parser_scan_version_directive_number(parser, start_mark, minor))
2200− return 0;
2201−
2202− return 1;
2203−}
2204−
2205−#define MAX_NUMBER_LENGTH 9
2206−
2207−/*
2208− * Scan the version number of VERSION-DIRECTIVE.
2209− *
2210− * Scope:
2211− * %YAML 1.1 # a comment \n
2212− * ^
2213− * %YAML 1.1 # a comment \n
2214− * ^
2215− */
2216−
2217−static int
2218−yaml_parser_scan_version_directive_number(yaml_parser_t *parser,
2219− yaml_mark_t start_mark, int *number)
2220−{
2221− int value = 0;
2222− size_t length = 0;
2223−
2224− /* Repeat while the next character is digit. */
2225−
2226− if (!CACHE(parser, 1)) return 0;
2227−
2228− while (IS_DIGIT(parser->buffer))
2229− {
2230− /* Check if the number is too long. */
2231−
2232− if (++length > MAX_NUMBER_LENGTH) {
2233− return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2234− start_mark, "found extremely long version number");
2235− }
2236−
2237− value = value*10 + AS_DIGIT(parser->buffer);
2238−
2239− SKIP(parser);
2240−
2241− if (!CACHE(parser, 1)) return 0;
2242− }
2243−
2244− /* Check if the number was present. */
2245−
2246− if (!length) {
2247− return yaml_parser_set_scanner_error(parser, "while scanning a %YAML directive",
2248− start_mark, "did not find expected version number");
2249− }
2250−
2251− *number = value;
2252−
2253− return 1;
2254−}
2255−
2256−/*
2257− * Scan the value of a TAG-DIRECTIVE token.
2258− *
2259− * Scope:
2260− * %TAG !yaml! tag:yaml.org,2002: \n
2261− * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2262− */
2263−
2264−static int
2265−yaml_parser_scan_tag_directive_value(yaml_parser_t *parser,
2266− yaml_mark_t start_mark, yaml_char_t **handle, yaml_char_t **prefix)
2267−{
2268− yaml_char_t *handle_value = NULL;
2269− yaml_char_t *prefix_value = NULL;
2270−
2271− /* Eat whitespaces. */
2272−
2273− if (!CACHE(parser, 1)) goto error;
2274−
2275− while (IS_BLANK(parser->buffer)) {
2276− SKIP(parser);
2277− if (!CACHE(parser, 1)) goto error;
2278− }
2279−
2280− /* Scan a handle. */
2281−
2282− if (!yaml_parser_scan_tag_handle(parser, 1, start_mark, &handle_value))
2283− goto error;
2284−
2285− /* Expect a whitespace. */
2286−
2287− if (!CACHE(parser, 1)) goto error;
2288−
2289− if (!IS_BLANK(parser->buffer)) {
2290− yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
2291− start_mark, "did not find expected whitespace");
2292− goto error;
2293− }
2294−
2295− /* Eat whitespaces. */
2296−
2297− while (IS_BLANK(parser->buffer)) {
2298− SKIP(parser);
2299− if (!CACHE(parser, 1)) goto error;
2300− }
2301−
2302− /* Scan a prefix. */
2303−
2304− if (!yaml_parser_scan_tag_uri(parser, 1, NULL, start_mark, &prefix_value))
2305− goto error;
2306−
2307− /* Expect a whitespace or line break. */
2308−
2309− if (!CACHE(parser, 1)) goto error;
2310−
2311− if (!IS_BLANKZ(parser->buffer)) {
2312− yaml_parser_set_scanner_error(parser, "while scanning a %TAG directive",
2313− start_mark, "did not find expected whitespace or line break");
2314− goto error;
2315− }
2316−
2317− *handle = handle_value;
2318− *prefix = prefix_value;
2319−
2320− return 1;
2321−
2322−error:
2323− yaml_free(handle_value);
2324− yaml_free(prefix_value);
2325− return 0;
2326−}
2327−
2328−static int
2329−yaml_parser_scan_anchor(yaml_parser_t *parser, yaml_token_t *token,
2330− yaml_token_type_t type)
2331−{
2332− int length = 0;
2333− yaml_mark_t start_mark, end_mark;
2334− yaml_string_t string = NULL_STRING;
2335−
2336− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2337−
2338− /* Eat the indicator character. */
2339−
2340− start_mark = parser->mark;
2341−
2342− SKIP(parser);
2343−
2344− /* Consume the value. */
2345−
2346− if (!CACHE(parser, 1)) goto error;
2347−
2348− while (IS_ALPHA(parser->buffer)) {
2349− if (!READ(parser, string)) goto error;
2350− if (!CACHE(parser, 1)) goto error;
2351− length ++;
2352− }
2353−
2354− end_mark = parser->mark;
2355−
2356− /*
2357− * Check if length of the anchor is greater than 0 and it is followed by
2358− * a whitespace character or one of the indicators:
2359− *
2360− * '?', ':', ',', ']', '}', '%', '@', '`'.
2361− */
2362−
2363− if (!length || !(IS_BLANKZ(parser->buffer) || CHECK(parser->buffer, '?')
2364− || CHECK(parser->buffer, ':') || CHECK(parser->buffer, ',')
2365− || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '}')
2366− || CHECK(parser->buffer, '%') || CHECK(parser->buffer, '@')
2367− || CHECK(parser->buffer, '`'))) {
2368− yaml_parser_set_scanner_error(parser, type == YAML_ANCHOR_TOKEN ?
2369− "while scanning an anchor" : "while scanning an alias", start_mark,
2370− "did not find expected alphabetic or numeric character");
2371− goto error;
2372− }
2373−
2374− /* Create a token. */
2375−
2376− if (type == YAML_ANCHOR_TOKEN) {
2377− ANCHOR_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2378− }
2379− else {
2380− ALIAS_TOKEN_INIT(*token, string.start, start_mark, end_mark);
2381− }
2382−
2383− return 1;
2384−
2385−error:
2386− STRING_DEL(parser, string);
2387− return 0;
2388−}
2389−
2390−/*
2391− * Scan a TAG token.
2392− */
2393−
2394−static int
2395−yaml_parser_scan_tag(yaml_parser_t *parser, yaml_token_t *token)
2396−{
2397− yaml_char_t *handle = NULL;
2398− yaml_char_t *suffix = NULL;
2399− yaml_mark_t start_mark, end_mark;
2400−
2401− start_mark = parser->mark;
2402−
2403− /* Check if the tag is in the canonical form. */
2404−
2405− if (!CACHE(parser, 2)) goto error;
2406−
2407− if (CHECK_AT(parser->buffer, '<', 1))
2408− {
2409− /* Set the handle to '' */
2410−
2411− handle = yaml_malloc(1);
2412− if (!handle) goto error;
2413− handle[0] = '\0';
2414−
2415− /* Eat '!<' */
2416−
2417− SKIP(parser);
2418− SKIP(parser);
2419−
2420− /* Consume the tag value. */
2421−
2422− if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2423− goto error;
2424−
2425− /* Check for '>' and eat it. */
2426−
2427− if (!CHECK(parser->buffer, '>')) {
2428− yaml_parser_set_scanner_error(parser, "while scanning a tag",
2429− start_mark, "did not find the expected '>'");
2430− goto error;
2431− }
2432−
2433− SKIP(parser);
2434− }
2435− else
2436− {
2437− /* The tag has either the '!suffix' or the '!handle!suffix' form. */
2438−
2439− /* First, try to scan a handle. */
2440−
2441− if (!yaml_parser_scan_tag_handle(parser, 0, start_mark, &handle))
2442− goto error;
2443−
2444− /* Check if it is, indeed, handle. */
2445−
2446− if (handle[0] == '!' && handle[1] != '\0' && handle[strlen((char *)handle)-1] == '!')
2447− {
2448− /* Scan the suffix now. */
2449−
2450− if (!yaml_parser_scan_tag_uri(parser, 0, NULL, start_mark, &suffix))
2451− goto error;
2452− }
2453− else
2454− {
2455− /* It wasn't a handle after all. Scan the rest of the tag. */
2456−
2457− if (!yaml_parser_scan_tag_uri(parser, 0, handle, start_mark, &suffix))
2458− goto error;
2459−
2460− /* Set the handle to '!'. */
2461−
2462− yaml_free(handle);
2463− handle = yaml_malloc(2);
2464− if (!handle) goto error;
2465− handle[0] = '!';
2466− handle[1] = '\0';
2467−
2468− /*
2469− * A special case: the '!' tag. Set the handle to '' and the
2470− * suffix to '!'.
2471− */
2472−
2473− if (suffix[0] == '\0') {
2474− yaml_char_t *tmp = handle;
2475− handle = suffix;
2476− suffix = tmp;
2477− }
2478− }
2479− }
2480−
2481− /* Check the character which ends the tag. */
2482−
2483− if (!CACHE(parser, 1)) goto error;
2484−
2485− if (!IS_BLANKZ(parser->buffer)) {
2486− yaml_parser_set_scanner_error(parser, "while scanning a tag",
2487− start_mark, "did not find expected whitespace or line break");
2488− goto error;
2489− }
2490−
2491− end_mark = parser->mark;
2492−
2493− /* Create a token. */
2494−
2495− TAG_TOKEN_INIT(*token, handle, suffix, start_mark, end_mark);
2496−
2497− return 1;
2498−
2499−error:
2500− yaml_free(handle);
2501− yaml_free(suffix);
2502− return 0;
2503−}
2504−
2505−/*
2506− * Scan a tag handle.
2507− */
2508−
2509−static int
2510−yaml_parser_scan_tag_handle(yaml_parser_t *parser, int directive,
2511− yaml_mark_t start_mark, yaml_char_t **handle)
2512−{
2513− yaml_string_t string = NULL_STRING;
2514−
2515− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2516−
2517− /* Check the initial '!' character. */
2518−
2519− if (!CACHE(parser, 1)) goto error;
2520−
2521− if (!CHECK(parser->buffer, '!')) {
2522− yaml_parser_set_scanner_error(parser, directive ?
2523− "while scanning a tag directive" : "while scanning a tag",
2524− start_mark, "did not find expected '!'");
2525− goto error;
2526− }
2527−
2528− /* Copy the '!' character. */
2529−
2530− if (!READ(parser, string)) goto error;
2531−
2532− /* Copy all subsequent alphabetical and numerical characters. */
2533−
2534− if (!CACHE(parser, 1)) goto error;
2535−
2536− while (IS_ALPHA(parser->buffer))
2537− {
2538− if (!READ(parser, string)) goto error;
2539− if (!CACHE(parser, 1)) goto error;
2540− }
2541−
2542− /* Check if the trailing character is '!' and copy it. */
2543−
2544− if (CHECK(parser->buffer, '!'))
2545− {
2546− if (!READ(parser, string)) goto error;
2547− }
2548− else
2549− {
2550− /*
2551− * It's either the '!' tag or not really a tag handle. If it's a %TAG
2552− * directive, it's an error. If it's a tag token, it must be a part of
2553− * URI.
2554− */
2555−
2556− if (directive && !(string.start[0] == '!' && string.start[1] == '\0')) {
2557− yaml_parser_set_scanner_error(parser, "while parsing a tag directive",
2558− start_mark, "did not find expected '!'");
2559− goto error;
2560− }
2561− }
2562−
2563− *handle = string.start;
2564−
2565− return 1;
2566−
2567−error:
2568− STRING_DEL(parser, string);
2569− return 0;
2570−}
2571−
2572−/*
2573− * Scan a tag.
2574− */
2575−
2576−static int
2577−yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive,
2578− yaml_char_t *head, yaml_mark_t start_mark, yaml_char_t **uri)
2579−{
2580− size_t length = head ? strlen((char *)head) : 0;
2581− yaml_string_t string = NULL_STRING;
2582−
2583− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2584−
2585− /* Resize the string to include the head. */
2586−
2587− while ((size_t)(string.end - string.start) <= length) {
2588− if (!yaml_string_extend(&string.start, &string.pointer, &string.end)) {
2589− parser->error = YAML_MEMORY_ERROR;
2590− goto error;
2591− }
2592− }
2593−
2594− /*
2595− * Copy the head if needed.
2596− *
2597− * Note that we don't copy the leading '!' character.
2598− */
2599−
2600− if (length > 1) {
2601− memcpy(string.start, head+1, length-1);
2602− string.pointer += length-1;
2603− }
2604−
2605− /* Scan the tag. */
2606−
2607− if (!CACHE(parser, 1)) goto error;
2608−
2609− /*
2610− * The set of characters that may appear in URI is as follows:
2611− *
2612− * '0'-'9', 'A'-'Z', 'a'-'z', '_', '-', ';', '/', '?', ':', '@', '&',
2613− * '=', '+', '$', ',', '.', '!', '~', '*', '\'', '(', ')', '[', ']',
2614− * '%'.
2615− */
2616−
2617− while (IS_ALPHA(parser->buffer) || CHECK(parser->buffer, ';')
2618− || CHECK(parser->buffer, '/') || CHECK(parser->buffer, '?')
2619− || CHECK(parser->buffer, ':') || CHECK(parser->buffer, '@')
2620− || CHECK(parser->buffer, '&') || CHECK(parser->buffer, '=')
2621− || CHECK(parser->buffer, '+') || CHECK(parser->buffer, '$')
2622− || CHECK(parser->buffer, ',') || CHECK(parser->buffer, '.')
2623− || CHECK(parser->buffer, '!') || CHECK(parser->buffer, '~')
2624− || CHECK(parser->buffer, '*') || CHECK(parser->buffer, '\'')
2625− || CHECK(parser->buffer, '(') || CHECK(parser->buffer, ')')
2626− || CHECK(parser->buffer, '[') || CHECK(parser->buffer, ']')
2627− || CHECK(parser->buffer, '%'))
2628− {
2629− /* Check if it is a URI-escape sequence. */
2630−
2631− if (CHECK(parser->buffer, '%')) {
2632− if (!yaml_parser_scan_uri_escapes(parser,
2633− directive, start_mark, &string)) goto error;
2634− }
2635− else {
2636− if (!READ(parser, string)) goto error;
2637− }
2638−
2639− length ++;
2640− if (!CACHE(parser, 1)) goto error;
2641− }
2642−
2643− /* Check if the tag is non-empty. */
2644−
2645− if (!length) {
2646− if (!STRING_EXTEND(parser, string))
2647− goto error;
2648−
2649− yaml_parser_set_scanner_error(parser, directive ?
2650− "while parsing a %TAG directive" : "while parsing a tag",
2651− start_mark, "did not find expected tag URI");
2652− goto error;
2653− }
2654−
2655− *uri = string.start;
2656−
2657− return 1;
2658−
2659−error:
2660− STRING_DEL(parser, string);
2661− return 0;
2662−}
2663−
2664−/*
2665− * Decode an URI-escape sequence corresponding to a single UTF-8 character.
2666− */
2667−
2668−static int
2669−yaml_parser_scan_uri_escapes(yaml_parser_t *parser, int directive,
2670− yaml_mark_t start_mark, yaml_string_t *string)
2671−{
2672− int width = 0;
2673−
2674− /* Decode the required number of characters. */
2675−
2676− do {
2677−
2678− unsigned char octet = 0;
2679−
2680− /* Check for a URI-escaped octet. */
2681−
2682− if (!CACHE(parser, 3)) return 0;
2683−
2684− if (!(CHECK(parser->buffer, '%')
2685− && IS_HEX_AT(parser->buffer, 1)
2686− && IS_HEX_AT(parser->buffer, 2))) {
2687− return yaml_parser_set_scanner_error(parser, directive ?
2688− "while parsing a %TAG directive" : "while parsing a tag",
2689− start_mark, "did not find URI escaped octet");
2690− }
2691−
2692− /* Get the octet. */
2693−
2694− octet = (AS_HEX_AT(parser->buffer, 1) << 4) + AS_HEX_AT(parser->buffer, 2);
2695−
2696− /* If it is the leading octet, determine the length of the UTF-8 sequence. */
2697−
2698− if (!width)
2699− {
2700− width = (octet & 0x80) == 0x00 ? 1 :
2701− (octet & 0xE0) == 0xC0 ? 2 :
2702− (octet & 0xF0) == 0xE0 ? 3 :
2703− (octet & 0xF8) == 0xF0 ? 4 : 0;
2704− if (!width) {
2705− return yaml_parser_set_scanner_error(parser, directive ?
2706− "while parsing a %TAG directive" : "while parsing a tag",
2707− start_mark, "found an incorrect leading UTF-8 octet");
2708− }
2709− }
2710− else
2711− {
2712− /* Check if the trailing octet is correct. */
2713−
2714− if ((octet & 0xC0) != 0x80) {
2715− return yaml_parser_set_scanner_error(parser, directive ?
2716− "while parsing a %TAG directive" : "while parsing a tag",
2717− start_mark, "found an incorrect trailing UTF-8 octet");
2718− }
2719− }
2720−
2721− /* Copy the octet and move the pointers. */
2722−
2723− *(string->pointer++) = octet;
2724− SKIP(parser);
2725− SKIP(parser);
2726− SKIP(parser);
2727−
2728− } while (--width);
2729−
2730− return 1;
2731−}
2732−
2733−/*
2734− * Scan a block scalar.
2735− */
2736−
2737−static int
2738−yaml_parser_scan_block_scalar(yaml_parser_t *parser, yaml_token_t *token,
2739− int literal)
2740−{
2741− yaml_mark_t start_mark;
2742− yaml_mark_t end_mark;
2743− yaml_string_t string = NULL_STRING;
2744− yaml_string_t leading_break = NULL_STRING;
2745− yaml_string_t trailing_breaks = NULL_STRING;
2746− int chomping = 0;
2747− int increment = 0;
2748− int indent = 0;
2749− int leading_blank = 0;
2750− int trailing_blank = 0;
2751−
2752− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
2753− if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
2754− if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
2755−
2756− /* Eat the indicator '|' or '>'. */
2757−
2758− start_mark = parser->mark;
2759−
2760− SKIP(parser);
2761−
2762− /* Scan the additional block scalar indicators. */
2763−
2764− if (!CACHE(parser, 1)) goto error;
2765−
2766− /* Check for a chomping indicator. */
2767−
2768− if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-'))
2769− {
2770− /* Set the chomping method and eat the indicator. */
2771−
2772− chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2773−
2774− SKIP(parser);
2775−
2776− /* Check for an indentation indicator. */
2777−
2778− if (!CACHE(parser, 1)) goto error;
2779−
2780− if (IS_DIGIT(parser->buffer))
2781− {
2782− /* Check that the intendation is greater than 0. */
2783−
2784− if (CHECK(parser->buffer, '0')) {
2785− yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2786− start_mark, "found an intendation indicator equal to 0");
2787− goto error;
2788− }
2789−
2790− /* Get the intendation level and eat the indicator. */
2791−
2792− increment = AS_DIGIT(parser->buffer);
2793−
2794− SKIP(parser);
2795− }
2796− }
2797−
2798− /* Do the same as above, but in the opposite order. */
2799−
2800− else if (IS_DIGIT(parser->buffer))
2801− {
2802− if (CHECK(parser->buffer, '0')) {
2803− yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2804− start_mark, "found an intendation indicator equal to 0");
2805− goto error;
2806− }
2807−
2808− increment = AS_DIGIT(parser->buffer);
2809−
2810− SKIP(parser);
2811−
2812− if (!CACHE(parser, 1)) goto error;
2813−
2814− if (CHECK(parser->buffer, '+') || CHECK(parser->buffer, '-')) {
2815− chomping = CHECK(parser->buffer, '+') ? +1 : -1;
2816−
2817− SKIP(parser);
2818− }
2819− }
2820−
2821− /* Eat whitespaces and comments to the end of the line. */
2822−
2823− if (!CACHE(parser, 1)) goto error;
2824−
2825− while (IS_BLANK(parser->buffer)) {
2826− SKIP(parser);
2827− if (!CACHE(parser, 1)) goto error;
2828− }
2829−
2830− if (CHECK(parser->buffer, '#')) {
2831− while (!IS_BREAKZ(parser->buffer)) {
2832− SKIP(parser);
2833− if (!CACHE(parser, 1)) goto error;
2834− }
2835− }
2836−
2837− /* Check if we are at the end of the line. */
2838−
2839− if (!IS_BREAKZ(parser->buffer)) {
2840− yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2841− start_mark, "did not find expected comment or line break");
2842− goto error;
2843− }
2844−
2845− /* Eat a line break. */
2846−
2847− if (IS_BREAK(parser->buffer)) {
2848− if (!CACHE(parser, 2)) goto error;
2849− SKIP_LINE(parser);
2850− }
2851−
2852− end_mark = parser->mark;
2853−
2854− /* Set the intendation level if it was specified. */
2855−
2856− if (increment) {
2857− indent = parser->indent >= 0 ? parser->indent+increment : increment;
2858− }
2859−
2860− /* Scan the leading line breaks and determine the indentation level if needed. */
2861−
2862− if (!yaml_parser_scan_block_scalar_breaks(parser, &indent, &trailing_breaks,
2863− start_mark, &end_mark)) goto error;
2864−
2865− /* Scan the block scalar content. */
2866−
2867− if (!CACHE(parser, 1)) goto error;
2868−
2869− while ((int)parser->mark.column == indent && !IS_Z(parser->buffer))
2870− {
2871− /*
2872− * We are at the beginning of a non-empty line.
2873− */
2874−
2875− /* Is it a trailing whitespace? */
2876−
2877− trailing_blank = IS_BLANK(parser->buffer);
2878−
2879− /* Check if we need to fold the leading line break. */
2880−
2881− if (!literal && (*leading_break.start == '\n')
2882− && !leading_blank && !trailing_blank)
2883− {
2884− /* Do we need to join the lines by space? */
2885−
2886− if (*trailing_breaks.start == '\0') {
2887− if (!STRING_EXTEND(parser, string)) goto error;
2888− *(string.pointer ++) = ' ';
2889− }
2890−
2891− CLEAR(parser, leading_break);
2892− }
2893− else {
2894− if (!JOIN(parser, string, leading_break)) goto error;
2895− CLEAR(parser, leading_break);
2896− }
2897−
2898− /* Append the remaining line breaks. */
2899−
2900− if (!JOIN(parser, string, trailing_breaks)) goto error;
2901− CLEAR(parser, trailing_breaks);
2902−
2903− /* Is it a leading whitespace? */
2904−
2905− leading_blank = IS_BLANK(parser->buffer);
2906−
2907− /* Consume the current line. */
2908−
2909− while (!IS_BREAKZ(parser->buffer)) {
2910− if (!READ(parser, string)) goto error;
2911− if (!CACHE(parser, 1)) goto error;
2912− }
2913−
2914− /* Consume the line break. */
2915−
2916− if (!CACHE(parser, 2)) goto error;
2917−
2918− if (!READ_LINE(parser, leading_break)) goto error;
2919−
2920− /* Eat the following intendation spaces and line breaks. */
2921−
2922− if (!yaml_parser_scan_block_scalar_breaks(parser,
2923− &indent, &trailing_breaks, start_mark, &end_mark)) goto error;
2924− }
2925−
2926− /* Chomp the tail. */
2927−
2928− if (chomping != -1) {
2929− if (!JOIN(parser, string, leading_break)) goto error;
2930− }
2931− if (chomping == 1) {
2932− if (!JOIN(parser, string, trailing_breaks)) goto error;
2933− }
2934−
2935− /* Create a token. */
2936−
2937− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
2938− literal ? YAML_LITERAL_SCALAR_STYLE : YAML_FOLDED_SCALAR_STYLE,
2939− start_mark, end_mark);
2940−
2941− STRING_DEL(parser, leading_break);
2942− STRING_DEL(parser, trailing_breaks);
2943−
2944− return 1;
2945−
2946−error:
2947− STRING_DEL(parser, string);
2948− STRING_DEL(parser, leading_break);
2949− STRING_DEL(parser, trailing_breaks);
2950−
2951− return 0;
2952−}
2953−
2954−/*
2955− * Scan intendation spaces and line breaks for a block scalar. Determine the
2956− * intendation level if needed.
2957− */
2958−
2959−static int
2960−yaml_parser_scan_block_scalar_breaks(yaml_parser_t *parser,
2961− int *indent, yaml_string_t *breaks,
2962− yaml_mark_t start_mark, yaml_mark_t *end_mark)
2963−{
2964− int max_indent = 0;
2965−
2966− *end_mark = parser->mark;
2967−
2968− /* Eat the intendation spaces and line breaks. */
2969−
2970− while (1)
2971− {
2972− /* Eat the intendation spaces. */
2973−
2974− if (!CACHE(parser, 1)) return 0;
2975−
2976− while ((!*indent || (int)parser->mark.column < *indent)
2977− && IS_SPACE(parser->buffer)) {
2978− SKIP(parser);
2979− if (!CACHE(parser, 1)) return 0;
2980− }
2981−
2982− if ((int)parser->mark.column > max_indent)
2983− max_indent = (int)parser->mark.column;
2984−
2985− /* Check for a tab character messing the intendation. */
2986−
2987− if ((!*indent || (int)parser->mark.column < *indent)
2988− && IS_TAB(parser->buffer)) {
2989− return yaml_parser_set_scanner_error(parser, "while scanning a block scalar",
2990− start_mark, "found a tab character where an intendation space is expected");
2991− }
2992−
2993− /* Have we found a non-empty line? */
2994−
2995− if (!IS_BREAK(parser->buffer)) break;
2996−
2997− /* Consume the line break. */
2998−
2999− if (!CACHE(parser, 2)) return 0;
3000− if (!READ_LINE(parser, *breaks)) return 0;
3001− *end_mark = parser->mark;
3002− }
3003−
3004− /* Determine the indentation level if needed. */
3005−
3006− if (!*indent) {
3007− *indent = max_indent;
3008− if (*indent < parser->indent + 1)
3009− *indent = parser->indent + 1;
3010− if (*indent < 1)
3011− *indent = 1;
3012− }
3013−
3014− return 1;
3015−}
3016−
3017−/*
3018− * Scan a quoted scalar.
3019− */
3020−
3021−static int
3022−yaml_parser_scan_flow_scalar(yaml_parser_t *parser, yaml_token_t *token,
3023− int single)
3024−{
3025− yaml_mark_t start_mark;
3026− yaml_mark_t end_mark;
3027− yaml_string_t string = NULL_STRING;
3028− yaml_string_t leading_break = NULL_STRING;
3029− yaml_string_t trailing_breaks = NULL_STRING;
3030− yaml_string_t whitespaces = NULL_STRING;
3031− int leading_blanks;
3032−
3033− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3034− if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3035− if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3036− if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
3037−
3038− /* Eat the left quote. */
3039−
3040− start_mark = parser->mark;
3041−
3042− SKIP(parser);
3043−
3044− /* Consume the content of the quoted scalar. */
3045−
3046− while (1)
3047− {
3048− /* Check that there are no document indicators at the beginning of the line. */
3049−
3050− if (!CACHE(parser, 4)) goto error;
3051−
3052− if (parser->mark.column == 0 &&
3053− ((CHECK_AT(parser->buffer, '-', 0) &&
3054− CHECK_AT(parser->buffer, '-', 1) &&
3055− CHECK_AT(parser->buffer, '-', 2)) ||
3056− (CHECK_AT(parser->buffer, '.', 0) &&
3057− CHECK_AT(parser->buffer, '.', 1) &&
3058− CHECK_AT(parser->buffer, '.', 2))) &&
3059− IS_BLANKZ_AT(parser->buffer, 3))
3060− {
3061− yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3062− start_mark, "found unexpected document indicator");
3063− goto error;
3064− }
3065−
3066− /* Check for EOF. */
3067−
3068− if (IS_Z(parser->buffer)) {
3069− yaml_parser_set_scanner_error(parser, "while scanning a quoted scalar",
3070− start_mark, "found unexpected end of stream");
3071− goto error;
3072− }
3073−
3074− /* Consume non-blank characters. */
3075−
3076− if (!CACHE(parser, 2)) goto error;
3077−
3078− leading_blanks = 0;
3079−
3080− while (!IS_BLANKZ(parser->buffer))
3081− {
3082− /* Check for an escaped single quote. */
3083−
3084− if (single && CHECK_AT(parser->buffer, '\'', 0)
3085− && CHECK_AT(parser->buffer, '\'', 1))
3086− {
3087− if (!STRING_EXTEND(parser, string)) goto error;
3088− *(string.pointer++) = '\'';
3089− SKIP(parser);
3090− SKIP(parser);
3091− }
3092−
3093− /* Check for the right quote. */
3094−
3095− else if (CHECK(parser->buffer, single ? '\'' : '"'))
3096− {
3097− break;
3098− }
3099−
3100− /* Check for an escaped line break. */
3101−
3102− else if (!single && CHECK(parser->buffer, '\\')
3103− && IS_BREAK_AT(parser->buffer, 1))
3104− {
3105− if (!CACHE(parser, 3)) goto error;
3106− SKIP(parser);
3107− SKIP_LINE(parser);
3108− leading_blanks = 1;
3109− break;
3110− }
3111−
3112− /* Check for an escape sequence. */
3113−
3114− else if (!single && CHECK(parser->buffer, '\\'))
3115− {
3116− size_t code_length = 0;
3117−
3118− if (!STRING_EXTEND(parser, string)) goto error;
3119−
3120− /* Check the escape character. */
3121−
3122− switch (parser->buffer.pointer[1])
3123− {
3124− case '0':
3125− *(string.pointer++) = '\0';
3126− break;
3127−
3128− case 'a':
3129− *(string.pointer++) = '\x07';
3130− break;
3131−
3132− case 'b':
3133− *(string.pointer++) = '\x08';
3134− break;
3135−
3136− case 't':
3137− case '\t':
3138− *(string.pointer++) = '\x09';
3139− break;
3140−
3141− case 'n':
3142− *(string.pointer++) = '\x0A';
3143− break;
3144−
3145− case 'v':
3146− *(string.pointer++) = '\x0B';
3147− break;
3148−
3149− case 'f':
3150− *(string.pointer++) = '\x0C';
3151− break;
3152−
3153− case 'r':
3154− *(string.pointer++) = '\x0D';
3155− break;
3156−
3157− case 'e':
3158− *(string.pointer++) = '\x1B';
3159− break;
3160−
3161− case ' ':
3162− *(string.pointer++) = '\x20';
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− if (CHECK(parser->buffer, single ? '\'' : '"'))
3288− break;
3289−
3290− /* Consume blank characters. */
3291−
3292− if (!CACHE(parser, 1)) goto error;
3293−
3294− while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3295− {
3296− if (IS_BLANK(parser->buffer))
3297− {
3298− /* Consume a space or a tab character. */
3299−
3300− if (!leading_blanks) {
3301− if (!READ(parser, whitespaces)) goto error;
3302− }
3303− else {
3304− SKIP(parser);
3305− }
3306− }
3307− else
3308− {
3309− if (!CACHE(parser, 2)) goto error;
3310−
3311− /* Check if it is a first line break. */
3312−
3313− if (!leading_blanks)
3314− {
3315− CLEAR(parser, whitespaces);
3316− if (!READ_LINE(parser, leading_break)) goto error;
3317− leading_blanks = 1;
3318− }
3319− else
3320− {
3321− if (!READ_LINE(parser, trailing_breaks)) goto error;
3322− }
3323− }
3324− if (!CACHE(parser, 1)) goto error;
3325− }
3326−
3327− /* Join the whitespaces or fold line breaks. */
3328−
3329− if (leading_blanks)
3330− {
3331− /* Do we need to fold line breaks? */
3332−
3333− if (leading_break.start[0] == '\n') {
3334− if (trailing_breaks.start[0] == '\0') {
3335− if (!STRING_EXTEND(parser, string)) goto error;
3336− *(string.pointer++) = ' ';
3337− }
3338− else {
3339− if (!JOIN(parser, string, trailing_breaks)) goto error;
3340− CLEAR(parser, trailing_breaks);
3341− }
3342− CLEAR(parser, leading_break);
3343− }
3344− else {
3345− if (!JOIN(parser, string, leading_break)) goto error;
3346− if (!JOIN(parser, string, trailing_breaks)) goto error;
3347− CLEAR(parser, leading_break);
3348− CLEAR(parser, trailing_breaks);
3349− }
3350− }
3351− else
3352− {
3353− if (!JOIN(parser, string, whitespaces)) goto error;
3354− CLEAR(parser, whitespaces);
3355− }
3356− }
3357−
3358− /* Eat the right quote. */
3359−
3360− SKIP(parser);
3361−
3362− end_mark = parser->mark;
3363−
3364− /* Create a token. */
3365−
3366− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3367− single ? YAML_SINGLE_QUOTED_SCALAR_STYLE : YAML_DOUBLE_QUOTED_SCALAR_STYLE,
3368− start_mark, end_mark);
3369−
3370− STRING_DEL(parser, leading_break);
3371− STRING_DEL(parser, trailing_breaks);
3372− STRING_DEL(parser, whitespaces);
3373−
3374− return 1;
3375−
3376−error:
3377− STRING_DEL(parser, string);
3378− STRING_DEL(parser, leading_break);
3379− STRING_DEL(parser, trailing_breaks);
3380− STRING_DEL(parser, whitespaces);
3381−
3382− return 0;
3383−}
3384−
3385−/*
3386− * Scan a plain scalar.
3387− */
3388−
3389−static int
3390−yaml_parser_scan_plain_scalar(yaml_parser_t *parser, yaml_token_t *token)
3391−{
3392− yaml_mark_t start_mark;
3393− yaml_mark_t end_mark;
3394− yaml_string_t string = NULL_STRING;
3395− yaml_string_t leading_break = NULL_STRING;
3396− yaml_string_t trailing_breaks = NULL_STRING;
3397− yaml_string_t whitespaces = NULL_STRING;
3398− int leading_blanks = 0;
3399− int indent = parser->indent+1;
3400−
3401− if (!STRING_INIT(parser, string, INITIAL_STRING_SIZE)) goto error;
3402− if (!STRING_INIT(parser, leading_break, INITIAL_STRING_SIZE)) goto error;
3403− if (!STRING_INIT(parser, trailing_breaks, INITIAL_STRING_SIZE)) goto error;
3404− if (!STRING_INIT(parser, whitespaces, INITIAL_STRING_SIZE)) goto error;
3405−
3406− start_mark = end_mark = parser->mark;
3407−
3408− /* Consume the content of the plain scalar. */
3409−
3410− while (1)
3411− {
3412− /* Check for a document indicator. */
3413−
3414− if (!CACHE(parser, 4)) goto error;
3415−
3416− if (parser->mark.column == 0 &&
3417− ((CHECK_AT(parser->buffer, '-', 0) &&
3418− CHECK_AT(parser->buffer, '-', 1) &&
3419− CHECK_AT(parser->buffer, '-', 2)) ||
3420− (CHECK_AT(parser->buffer, '.', 0) &&
3421− CHECK_AT(parser->buffer, '.', 1) &&
3422− CHECK_AT(parser->buffer, '.', 2))) &&
3423− IS_BLANKZ_AT(parser->buffer, 3)) break;
3424−
3425− /* Check for a comment. */
3426−
3427− if (CHECK(parser->buffer, '#'))
3428− break;
3429−
3430− /* Consume non-blank characters. */
3431−
3432− while (!IS_BLANKZ(parser->buffer))
3433− {
3434− /* Check for 'x:x' in the flow context. TODO: Fix the test "spec-08-13". */
3435−
3436− if (parser->flow_level
3437− && CHECK(parser->buffer, ':')
3438− && !IS_BLANKZ_AT(parser->buffer, 1)) {
3439− yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3440− start_mark, "found unexpected ':'");
3441− goto error;
3442− }
3443−
3444− /* Check for indicators that may end a plain scalar. */
3445−
3446− if ((CHECK(parser->buffer, ':') && IS_BLANKZ_AT(parser->buffer, 1))
3447− || (parser->flow_level &&
3448− (CHECK(parser->buffer, ',') || CHECK(parser->buffer, ':')
3449− || CHECK(parser->buffer, '?') || CHECK(parser->buffer, '[')
3450− || CHECK(parser->buffer, ']') || CHECK(parser->buffer, '{')
3451− || CHECK(parser->buffer, '}'))))
3452− break;
3453−
3454− /* Check if we need to join whitespaces and breaks. */
3455−
3456− if (leading_blanks || whitespaces.start != whitespaces.pointer)
3457− {
3458− if (leading_blanks)
3459− {
3460− /* Do we need to fold line breaks? */
3461−
3462− if (leading_break.start[0] == '\n') {
3463− if (trailing_breaks.start[0] == '\0') {
3464− if (!STRING_EXTEND(parser, string)) goto error;
3465− *(string.pointer++) = ' ';
3466− }
3467− else {
3468− if (!JOIN(parser, string, trailing_breaks)) goto error;
3469− CLEAR(parser, trailing_breaks);
3470− }
3471− CLEAR(parser, leading_break);
3472− }
3473− else {
3474− if (!JOIN(parser, string, leading_break)) goto error;
3475− if (!JOIN(parser, string, trailing_breaks)) goto error;
3476− CLEAR(parser, leading_break);
3477− CLEAR(parser, trailing_breaks);
3478− }
3479−
3480− leading_blanks = 0;
3481− }
3482− else
3483− {
3484− if (!JOIN(parser, string, whitespaces)) goto error;
3485− CLEAR(parser, whitespaces);
3486− }
3487− }
3488−
3489− /* Copy the character. */
3490−
3491− if (!READ(parser, string)) goto error;
3492−
3493− end_mark = parser->mark;
3494−
3495− if (!CACHE(parser, 2)) goto error;
3496− }
3497−
3498− /* Is it the end? */
3499−
3500− if (!(IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer)))
3501− break;
3502−
3503− /* Consume blank characters. */
3504−
3505− if (!CACHE(parser, 1)) goto error;
3506−
3507− while (IS_BLANK(parser->buffer) || IS_BREAK(parser->buffer))
3508− {
3509− if (IS_BLANK(parser->buffer))
3510− {
3511− /* Check for tab character that abuse intendation. */
3512−
3513− if (leading_blanks && (int)parser->mark.column < indent
3514− && IS_TAB(parser->buffer)) {
3515− yaml_parser_set_scanner_error(parser, "while scanning a plain scalar",
3516− start_mark, "found a tab character that violate intendation");
3517− goto error;
3518− }
3519−
3520− /* Consume a space or a tab character. */
3521−
3522− if (!leading_blanks) {
3523− if (!READ(parser, whitespaces)) goto error;
3524− }
3525− else {
3526− SKIP(parser);
3527− }
3528− }
3529− else
3530− {
3531− if (!CACHE(parser, 2)) goto error;
3532−
3533− /* Check if it is a first line break. */
3534−
3535− if (!leading_blanks)
3536− {
3537− CLEAR(parser, whitespaces);
3538− if (!READ_LINE(parser, leading_break)) goto error;
3539− leading_blanks = 1;
3540− }
3541− else
3542− {
3543− if (!READ_LINE(parser, trailing_breaks)) goto error;
3544− }
3545− }
3546− if (!CACHE(parser, 1)) goto error;
3547− }
3548−
3549− /* Check intendation level. */
3550−
3551− if (!parser->flow_level && (int)parser->mark.column < indent)
3552− break;
3553− }
3554−
3555− /* Create a token. */
3556−
3557− SCALAR_TOKEN_INIT(*token, string.start, string.pointer-string.start,
3558− YAML_PLAIN_SCALAR_STYLE, start_mark, end_mark);
3559−
3560− /* Note that we change the 'simple_key_allowed' flag. */
3561−
3562− if (leading_blanks) {
3563− parser->simple_key_allowed = 1;
3564− }
3565−
3566− STRING_DEL(parser, leading_break);
3567− STRING_DEL(parser, trailing_breaks);
3568− STRING_DEL(parser, whitespaces);
3569−
3570− return 1;
3571−
3572−error:
3573− STRING_DEL(parser, string);
3574− STRING_DEL(parser, leading_break);
3575− STRING_DEL(parser, trailing_breaks);
3576− STRING_DEL(parser, whitespaces);
3577−
3578− return 0;
3579−}
3580−