summaryrefslogtreecommitdiff
path: root/jni/ruby/ext/psych/yaml/loader.c
blob: cb3ea930891b9032b786d05981eafc65c7d0d2a0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459

#include "yaml_private.h"

/*
 * API functions.
 */

YAML_DECLARE(int)
yaml_parser_load(yaml_parser_t *parser, yaml_document_t *document);

/*
 * Error handling.
 */

static int
yaml_parser_set_composer_error(yaml_parser_t *parser,
        const char *problem, yaml_mark_t problem_mark);

static int
yaml_parser_set_composer_error_context(yaml_parser_t *parser,
        const char *context, yaml_mark_t context_mark,
        const char *problem, yaml_mark_t problem_mark);


/*
 * Alias handling.
 */

static int
yaml_parser_register_anchor(yaml_parser_t *parser,
        int index, yaml_char_t *anchor);

/*
 * Clean up functions.
 */

static void
yaml_parser_delete_aliases(yaml_parser_t *parser);

/*
 * Composer functions.
 */

static int
yaml_parser_load_document(yaml_parser_t *parser, yaml_event_t *first_event);

static int
yaml_parser_load_node(yaml_parser_t *parser, yaml_event_t *first_event);

static int
yaml_parser_load_alias(yaml_parser_t *parser, yaml_event_t *first_event);

static int
yaml_parser_load_scalar(yaml_parser_t *parser, yaml_event_t *first_event);

static int
yaml_parser_load_sequence(yaml_parser_t *parser, yaml_event_t *first_event);

static int
yaml_parser_load_mapping(yaml_parser_t *parser, yaml_event_t *first_event);

/*
 * Load the next document of the stream.
 */

YAML_DECLARE(int)
yaml_parser_load(yaml_parser_t *parser, yaml_document_t *document)
{
    yaml_event_t event;

    assert(parser);     /* Non-NULL parser object is expected. */
    assert(document);   /* Non-NULL document object is expected. */

    memset(document, 0sizeof(yaml_document_t));
    if (!STACK_INIT(parser, document->nodes, INITIAL_STACK_SIZE))
        goto error;

    if (!parser->stream_start_produced) {
        if (!yaml_parser_parse(parser, &event)) goto error;
        assert(event.type == YAML_STREAM_START_EVENT);
                        /* STREAM-START is expected. */
    }

    if (parser->stream_end_produced) {
        return 1;
    }

    if (!yaml_parser_parse(parser, &event)) goto error;
    if (event.type == YAML_STREAM_END_EVENT) {
        return 1;
    }

    if (!STACK_INIT(parser, parser->aliases, INITIAL_STACK_SIZE))
        goto error;

    parser->document = document;

    if (!yaml_parser_load_document(parser, &event)) goto error;

    yaml_parser_delete_aliases(parser);
    parser->document = NULL;

    return 1;

error:

    yaml_parser_delete_aliases(parser);
    yaml_document_delete(document);
    parser->document = NULL;

    return 0;
}

/*
 * Set composer error.
 */

static int
yaml_parser_set_composer_error(yaml_parser_t *parser,
        const char *problem, yaml_mark_t problem_mark)
{
    parser->error = YAML_COMPOSER_ERROR;
    parser->problem = problem;
    parser->problem_mark = problem_mark;

    return 0;
}

/*
 * Set composer error with context.
 */

static int
yaml_parser_set_composer_error_context(yaml_parser_t *parser,
        const char *context, yaml_mark_t context_mark,
        const char *problem, yaml_mark_t problem_mark)
{
    parser->error = YAML_COMPOSER_ERROR;
    parser->context = context;
    parser->context_mark = context_mark;
    parser->problem = problem;
    parser->problem_mark = problem_mark;

    return 0;
}

/*
 * Delete the stack of aliases.
 */

static void
yaml_parser_delete_aliases(yaml_parser_t *parser)
{
    while (!STACK_EMPTY(parser, parser->aliases)) {
        yaml_free(POP(parser, parser->aliases).anchor);
    }
    STACK_DEL(parser, parser->aliases);
}

/*
 * Compose a document object.
 */

static int
yaml_parser_load_document(yaml_parser_t *parser, yaml_event_t *first_event)
{
    yaml_event_t event;

    assert(first_event->type == YAML_DOCUMENT_START_EVENT);
                        /* DOCUMENT-START is expected. */

    parser->document->version_directive
        = first_event->data.document_start.version_directive;
    parser->document->tag_directives.start
        = first_event->data.document_start.tag_directives.start;
    parser->document->tag_directives.end
        = first_event->data.document_start.tag_directives.end;
    parser->document->start_implicit
        = first_event->data.document_start.implicit;
    parser->document->start_mark = first_event->start_mark;

    if (!yaml_parser_parse(parser, &event)) return 0;

    if (!yaml_parser_load_node(parser, &event)) return 0;

    if (!yaml_parser_parse(parser, &event)) return 0;
    assert(event.type == YAML_DOCUMENT_END_EVENT);
                        /* DOCUMENT-END is expected. */

    parser->document->end_implicit = event.data.document_end.implicit;
    parser->document->end_mark = event.end_mark;

    return 1;
}

/*
 * Compose a node.
 */

static int
yaml_parser_load_node(yaml_parser_t *parser, yaml_event_t *first_event)
{
    switch (first_event->type) {
        case YAML_ALIAS_EVENT:
            return yaml_parser_load_alias(parser, first_event);
        case YAML_SCALAR_EVENT:
            return yaml_parser_load_scalar(parser, first_event);
        case YAML_SEQUENCE_START_EVENT:
            return yaml_parser_load_sequence(parser, first_event);
        case YAML_MAPPING_START_EVENT:
            return yaml_parser_load_mapping(parser, first_event);
        default:
            assert(0);  /* Could not happen. */
            return 0;
    }

    return 0;
}

/*
 * Add an anchor.
 */

static int
yaml_parser_register_anchor(yaml_parser_t *parser,
        int index, yaml_char_t *anchor)
{
    yaml_alias_data_t data;
    yaml_alias_data_t *alias_data;

    if (!anchor) return 1;

    data.anchor = anchor;
    data.index = index;
    data.mark = parser->document->nodes.start[index-1].start_mark;

    for (alias_data = parser->aliases.start;
            alias_data != parser->aliases.top; alias_data ++) {
        if (strcmp((char *)alias_data->anchor, (char *)anchor) == 0) {
            yaml_free(anchor);
            return yaml_parser_set_composer_error_context(parser,
                    "found duplicate anchor; first occurence",
                    alias_data->mark, "second occurence", data.mark);
        }
    }

    if (!PUSH(parser, parser->aliases, data)) {
        yaml_free(anchor);
        return 0;
    }

    return 1;
}

/*
 * Compose a node corresponding to an alias.
 */

static int
yaml_parser_load_alias(yaml_parser_t *parser, yaml_event_t *first_event)
{
    yaml_char_t *anchor = first_event->data.alias.anchor;
    yaml_alias_data_t *alias_data;

    for (alias_data = parser->aliases.start;
            alias_data != parser->aliases.top; alias_data ++) {
        if (strcmp((char *)alias_data->anchor, (char *)anchor) == 0) {
            yaml_free(anchor);
            return alias_data->index;
        }
    }

    yaml_free(anchor);
    return yaml_parser_set_composer_error(parser, "found undefined alias",
            first_event->start_mark);
}

/*
 * Compose a scalar node.
 */

static int
yaml_parser_load_scalar(yaml_parser_t *parser, yaml_event_t *first_event)
{
    yaml_node_t node;
    ptrdiff_t node_index;
    int index;
    yaml_char_t *tag = first_event->data.scalar.tag;

    if (!STACK_LIMIT(parser, parser->document->nodes, INT_MAX-1)) goto error;

    if (!tag || strcmp((char *)tag, "!") == 0) {
        yaml_free(tag);
        tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_SCALAR_TAG);
        if (!tag) goto error;
    }

    SCALAR_NODE_INIT(node, tag, first_event->data.scalar.value,
            first_event->data.scalar.length, first_event->data.scalar.style,
            first_event->start_mark, first_event->end_mark);

    if (!PUSH(parser, parser->document->nodes, node)) goto error;

    node_index = parser->document->nodes.top - parser->document->nodes.start;
#if PTRDIFF_MAX > INT_MAX
    if (node_index > INT_MAXgoto error;
#endif
    index = (int)node_index;

    if (!yaml_parser_register_anchor(parser, index,
                first_event->data.scalar.anchor)) return 0;

    return index;

error:
    yaml_free(tag);
    yaml_free(first_event->data.scalar.anchor);
    yaml_free(first_event->data.scalar.value);
    return 0;
}

/*
 * Compose a sequence node.
 */

static int
yaml_parser_load_sequence(yaml_parser_t *parser, yaml_event_t *first_event)
{
    yaml_event_t event;
    yaml_node_t node;
    struct {
        yaml_node_item_t *start;
        yaml_node_item_t *end;
        yaml_node_item_t *top;
    } items = { NULLNULLNULL };
    int index, item_index;
    ptrdiff_t node_index;
    yaml_char_t *tag = first_event->data.sequence_start.tag;

    if (!STACK_LIMIT(parser, parser->document->nodes, INT_MAX-1)) goto error;

    if (!tag || strcmp((char *)tag, "!") == 0) {
        yaml_free(tag);
        tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_SEQUENCE_TAG);
        if (!tag) goto error;
    }

    if (!STACK_INIT(parser, items, INITIAL_STACK_SIZE)) goto error;

    SEQUENCE_NODE_INIT(node, tag, items.start, items.end,
            first_event->data.sequence_start.style,
            first_event->start_mark, first_event->end_mark);

    if (!PUSH(parser, parser->document->nodes, node)) goto error;

    node_index = parser->document->nodes.top - parser->document->nodes.start;
#if PTRDIFF_MAX > INT_MAX
    if (node_index > INT_MAXgoto error;
#endif
    index = (int)node_index;

    if (!yaml_parser_register_anchor(parser, index,
                first_event->data.sequence_start.anchor)) return 0;

    if (!yaml_parser_parse(parser, &event)) return 0;

    while (event.type != YAML_SEQUENCE_END_EVENT) {
        if (!STACK_LIMIT(parser,
                    parser->document->nodes.start[index-1].data.sequence.items,
                    INT_MAX-1)) return 0;
        item_index = yaml_parser_load_node(parser, &event);
        if (!item_index) return 0;
        if (!PUSH(parser,
                    parser->document->nodes.start[index-1].data.sequence.items,
                    item_index)) return 0;
        if (!yaml_parser_parse(parser, &event)) return 0;
    }

    parser->document->nodes.start[index-1].end_mark = event.end_mark;

    return index;

error:
    yaml_free(tag);
    yaml_free(first_event->data.sequence_start.anchor);
    return 0;
}

/*
 * Compose a mapping node.
 */

static int
yaml_parser_load_mapping(yaml_parser_t *parser, yaml_event_t *first_event)
{
    yaml_event_t event;
    yaml_node_t node;
    struct {
        yaml_node_pair_t *start;
        yaml_node_pair_t *end;
        yaml_node_pair_t *top;
    } pairs = { NULLNULLNULL };
    int index;
    ptrdiff_t node_index;
    yaml_node_pair_t pair;
    yaml_char_t *tag = first_event->data.mapping_start.tag;

    if (!STACK_LIMIT(parser, parser->document->nodes, INT_MAX-1)) goto error;

    if (!tag || strcmp((char *)tag, "!") == 0) {
        yaml_free(tag);
        tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_MAPPING_TAG);
        if (!tag) goto error;
    }

    if (!STACK_INIT(parser, pairs, INITIAL_STACK_SIZE)) goto error;

    MAPPING_NODE_INIT(node, tag, pairs.start, pairs.end,
            first_event->data.mapping_start.style,
            first_event->start_mark, first_event->end_mark);

    if (!PUSH(parser, parser->document->nodes, node)) goto error;

    node_index = parser->document->nodes.top - parser->document->nodes.start;
#if PTRDIFF_MAX > INT_MAX
    if (node_index > INT_MAXgoto error;
#endif
    index = (int)node_index;

    if (!yaml_parser_register_anchor(parser, index,
                first_event->data.mapping_start.anchor)) return 0;

    if (!yaml_parser_parse(parser, &event)) return 0;

    while (event.type != YAML_MAPPING_END_EVENT) {
        if (!STACK_LIMIT(parser,
                    parser->document->nodes.start[index-1].data.mapping.pairs,
                    INT_MAX-1)) return 0;
        pair.key = yaml_parser_load_node(parser, &event);
        if (!pair.key) return 0;
        if (!yaml_parser_parse(parser, &event)) return 0;
        pair.value = yaml_parser_load_node(parser, &event);
        if (!pair.value) return 0;
        if (!PUSH(parser,
                    parser->document->nodes.start[index-1].data.mapping.pairs,
                    pair)) return 0;
        if (!yaml_parser_parse(parser, &event)) return 0;
    }

    parser->document->nodes.start[index-1].end_mark = event.end_mark;

    return index;

error:
    yaml_free(tag);
    yaml_free(first_event->data.mapping_start.anchor);
    return 0;
}