[libyaml.git] / src / loader.c


#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, 0, sizeof(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 = { anchor, index, { 0, 0, 0 } };
    yaml_alias_data_t *alias_data;

    if (!anchor) return 1;

    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;
    int index;
    yaml_char_t *tag = first_event->data.scalar.tag;

    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;

    index = parser->document->nodes.top - parser->document->nodes.start;

    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 = { NULL, NULL, NULL };
    int index, item_index;
    yaml_char_t *tag = first_event->data.sequence_start.tag;

    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;

    index = parser->document->nodes.top - parser->document->nodes.start;

    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) {
        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 = { NULL, NULL, NULL };
    int index;
    yaml_node_pair_t pair;
    yaml_char_t *tag = first_event->data.mapping_start.tag;

    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;

    index = parser->document->nodes.top - parser->document->nodes.start;

    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) {
        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;
}
Commit	Line	Data
e27a3c88 KS	1
	2	#include "yaml_private.h"
	3
	4	/*
	5	* API functions.
	6	*/
	7
	8	YAML_DECLARE(int)
	9	yaml_parser_load(yaml_parser_t parser, yaml_document_t document);
	10
	11	/*
	12	* Error handling.
	13	*/
	14
	15	static int
c9b74def	16	yaml_parser_set_composer_error(yaml_parser_t *parser,
e27a3c88 KS	17	const char *problem, yaml_mark_t problem_mark);
	18
	19	static int
c9b74def	20	yaml_parser_set_composer_error_context(yaml_parser_t *parser,
e27a3c88 KS	21	const char *context, yaml_mark_t context_mark,
	22	const char *problem, yaml_mark_t problem_mark);
	23
	24
	25	/*
	26	* Alias handling.
	27	*/
	28
	29	static int
	30	yaml_parser_register_anchor(yaml_parser_t *parser,
	31	int index, yaml_char_t *anchor);
	32
	33	/*
	34	* Clean up functions.
	35	*/
	36
	37	static void
	38	yaml_parser_delete_aliases(yaml_parser_t *parser);
	39
	40	/*
	41	* Composer functions.
	42	*/
	43
	44	static int
	45	yaml_parser_load_document(yaml_parser_t parser, yaml_event_t first_event);
	46
	47	static int
	48	yaml_parser_load_node(yaml_parser_t parser, yaml_event_t first_event);
	49
	50	static int
	51	yaml_parser_load_alias(yaml_parser_t parser, yaml_event_t first_event);
	52
	53	static int
	54	yaml_parser_load_scalar(yaml_parser_t parser, yaml_event_t first_event);
	55
	56	static int
	57	yaml_parser_load_sequence(yaml_parser_t parser, yaml_event_t first_event);
	58
	59	static int
	60	yaml_parser_load_mapping(yaml_parser_t parser, yaml_event_t first_event);
	61
	62	/*
	63	* Load the next document of the stream.
	64	*/
	65
	66	YAML_DECLARE(int)
	67	yaml_parser_load(yaml_parser_t parser, yaml_document_t document)
	68	{
	69	yaml_event_t event;
	70
	71	assert(parser); /* Non-NULL parser object is expected. */
	72	assert(document); /* Non-NULL document object is expected. */
	73
	74	memset(document, 0, sizeof(yaml_document_t));
	75	if (!STACK_INIT(parser, document->nodes, INITIAL_STACK_SIZE))
	76	goto error;
	77
	78	if (!parser->stream_start_produced) {
	79	if (!yaml_parser_parse(parser, &event)) goto error;
	80	assert(event.type == YAML_STREAM_START_EVENT);
	81	/* STREAM-START is expected. */
	82	}
	83
	84	if (parser->stream_end_produced) {
85	return 1;
86	}
87
88	if (!yaml_parser_parse(parser, &event)) goto error;
89	if (event.type == YAML_STREAM_END_EVENT) {
90	return 1;
91	}
92
93	if (!STACK_INIT(parser, parser->aliases, INITIAL_STACK_SIZE))
94	goto error;
95
96	parser->document = document;
97
98	if (!yaml_parser_load_document(parser, &event)) goto error;
99
100	yaml_parser_delete_aliases(parser);
101	parser->document = NULL;
102
103	return 1;
104
105	error:
106
107	yaml_parser_delete_aliases(parser);
108	yaml_document_delete(document);
109	parser->document = NULL;
110
111	return 0;
112	}
113
114	/*
115	* Set composer error.
116	*/
117
118	static int
119	yaml_parser_set_composer_error(yaml_parser_t *parser,
120	const char *problem, yaml_mark_t problem_mark)
121	{
122	parser->error = YAML_COMPOSER_ERROR;
123	parser->problem = problem;
124	parser->problem_mark = problem_mark;
125
126	return 0;
127	}
128
129	/*
130	* Set composer error with context.
131	*/
132
133	static int
134	yaml_parser_set_composer_error_context(yaml_parser_t *parser,
135	const char *context, yaml_mark_t context_mark,
136	const char *problem, yaml_mark_t problem_mark)
137	{
138	parser->error = YAML_COMPOSER_ERROR;
139	parser->context = context;
140	parser->context_mark = context_mark;
141	parser->problem = problem;
142	parser->problem_mark = problem_mark;
143
144	return 0;
145	}
146
147	/*
148	* Delete the stack of aliases.
149	*/
150
151	static void
152	yaml_parser_delete_aliases(yaml_parser_t *parser)
153	{
154	while (!STACK_EMPTY(parser, parser->aliases)) {
155	yaml_free(POP(parser, parser->aliases).anchor);
156	}
157	STACK_DEL(parser, parser->aliases);
158	}
159
160	/*
161	* Compose a document object.
162	*/
163
164	static int
165	yaml_parser_load_document(yaml_parser_t parser, yaml_event_t first_event)
166	{
167	yaml_event_t event;
168
169	assert(first_event->type == YAML_DOCUMENT_START_EVENT);
170	/* DOCUMENT-START is expected. */
171
172	parser->document->version_directive
173	= first_event->data.document_start.version_directive;
174	parser->document->tag_directives.start
175	= first_event->data.document_start.tag_directives.start;
176	parser->document->tag_directives.end
177	= first_event->data.document_start.tag_directives.end;
178	parser->document->start_implicit
179	= first_event->data.document_start.implicit;
180	parser->document->start_mark = first_event->start_mark;
181
182	if (!yaml_parser_parse(parser, &event)) return 0;
183
184	if (!yaml_parser_load_node(parser, &event)) return 0;
185
186	if (!yaml_parser_parse(parser, &event)) return 0;
187	assert(event.type == YAML_DOCUMENT_END_EVENT);
188	/* DOCUMENT-END is expected. */
189
190	parser->document->end_implicit = event.data.document_end.implicit;
191	parser->document->end_mark = event.end_mark;
192
193	return 1;
194	}
195
196	/*
197	* Compose a node.
198	*/
199
200	static int
201	yaml_parser_load_node(yaml_parser_t parser, yaml_event_t first_event)
202	{
203	switch (first_event->type) {
204	case YAML_ALIAS_EVENT:
205	return yaml_parser_load_alias(parser, first_event);
206	case YAML_SCALAR_EVENT:
207	return yaml_parser_load_scalar(parser, first_event);
208	case YAML_SEQUENCE_START_EVENT:
209	return yaml_parser_load_sequence(parser, first_event);
210	case YAML_MAPPING_START_EVENT:
211	return yaml_parser_load_mapping(parser, first_event);
212	default:
213	assert(0); /* Could not happen. */
214	return 0;
215	}
216
217	return 0;
218	}
219
220	/*
221	* Add an anchor.
222	*/
223
224	static int
225	yaml_parser_register_anchor(yaml_parser_t *parser,
226	int index, yaml_char_t *anchor)
227	{
0174ed6e	228	yaml_alias_data_t data = { anchor, index, { 0, 0, 0 } };
e27a3c88 KS	229	yaml_alias_data_t *alias_data;
	230
	231	if (!anchor) return 1;
	232
0174ed6e KS	233	data.mark = parser->document->nodes.start[index-1].start_mark;
0174ed6e KS	234
e27a3c88 KS	235	for (alias_data = parser->aliases.start;
	236	alias_data != parser->aliases.top; alias_data ++) {
	237	if (strcmp((char )alias_data->anchor, (char )anchor) == 0) {
	238	yaml_free(anchor);
	239	return yaml_parser_set_composer_error_context(parser,
	240	"found duplicate anchor; first occurence",
	241	alias_data->mark, "second occurence", data.mark);
	242	}
	243	}
	244
	245	if (!PUSH(parser, parser->aliases, data)) {
	246	yaml_free(anchor);
	247	return 0;
	248	}
	249
	250	return 1;
	251	}
	252
	253	/*
	254	* Compose a node corresponding to an alias.
	255	*/
	256
	257	static int
	258	yaml_parser_load_alias(yaml_parser_t parser, yaml_event_t first_event)
	259	{
	260	yaml_char_t *anchor = first_event->data.alias.anchor;
	261	yaml_alias_data_t *alias_data;
	262
	263	for (alias_data = parser->aliases.start;
	264	alias_data != parser->aliases.top; alias_data ++) {
	265	if (strcmp((char )alias_data->anchor, (char )anchor) == 0) {
	266	yaml_free(anchor);
	267	return alias_data->index;
	268	}
	269	}
	270
	271	yaml_free(anchor);
	272	return yaml_parser_set_composer_error(parser, "found undefined alias",
	273	first_event->start_mark);
	274	}
	275
	276	/*
	277	* Compose a scalar node.
	278	*/
	279
	280	static int
	281	yaml_parser_load_scalar(yaml_parser_t parser, yaml_event_t first_event)
	282	{
	283	yaml_node_t node;
	284	int index;
	285	yaml_char_t *tag = first_event->data.scalar.tag;
	286
	287	if (!tag \|\| strcmp((char *)tag, "!") == 0) {
	288	yaml_free(tag);
c9b74def	289	tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_SCALAR_TAG);
e27a3c88 KS	290	if (!tag) goto error;
	291	}
	292
	293	SCALAR_NODE_INIT(node, tag, first_event->data.scalar.value,
	294	first_event->data.scalar.length, first_event->data.scalar.style,
	295	first_event->start_mark, first_event->end_mark);
	296
	297	if (!PUSH(parser, parser->document->nodes, node)) goto error;
	298
	299	index = parser->document->nodes.top - parser->document->nodes.start;
	300
	301	if (!yaml_parser_register_anchor(parser, index,
	302	first_event->data.scalar.anchor)) return 0;
	303
	304	return index;
	305
	306	error:
	307	yaml_free(tag);
	308	yaml_free(first_event->data.scalar.anchor);
	309	yaml_free(first_event->data.scalar.value);
	310	return 0;
	311	}
	312
	313	/*
	314	* Compose a sequence node.
	315	*/
	316
	317	static int
	318	yaml_parser_load_sequence(yaml_parser_t parser, yaml_event_t first_event)
	319	{
	320	yaml_event_t event;
	321	yaml_node_t node;
	322	struct {
	323	yaml_node_item_t *start;
	324	yaml_node_item_t *end;
	325	yaml_node_item_t *top;
	326	} items = { NULL, NULL, NULL };
	327	int index, item_index;
	328	yaml_char_t *tag = first_event->data.sequence_start.tag;
	329
	330	if (!tag \|\| strcmp((char *)tag, "!") == 0) {
	331	yaml_free(tag);
c9b74def	332	tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_SEQUENCE_TAG);
e27a3c88 KS	333	if (!tag) goto error;
	334	}
	335
	336	if (!STACK_INIT(parser, items, INITIAL_STACK_SIZE)) goto error;
	337
	338	SEQUENCE_NODE_INIT(node, tag, items.start, items.end,
	339	first_event->data.sequence_start.style,
	340	first_event->start_mark, first_event->end_mark);
	341
	342	if (!PUSH(parser, parser->document->nodes, node)) goto error;
	343
	344	index = parser->document->nodes.top - parser->document->nodes.start;
	345
	346	if (!yaml_parser_register_anchor(parser, index,
	347	first_event->data.sequence_start.anchor)) return 0;
	348
	349	if (!yaml_parser_parse(parser, &event)) return 0;
	350
	351	while (event.type != YAML_SEQUENCE_END_EVENT) {
	352	item_index = yaml_parser_load_node(parser, &event);
	353	if (!item_index) return 0;
	354	if (!PUSH(parser,
	355	parser->document->nodes.start[index-1].data.sequence.items,
	356	item_index)) return 0;
	357	if (!yaml_parser_parse(parser, &event)) return 0;
	358	}
	359
	360	parser->document->nodes.start[index-1].end_mark = event.end_mark;
	361
	362	return index;
	363
	364	error:
	365	yaml_free(tag);
	366	yaml_free(first_event->data.sequence_start.anchor);
	367	return 0;
	368	}
	369
	370	/*
	371	* Compose a mapping node.
	372	*/
	373
	374	static int
	375	yaml_parser_load_mapping(yaml_parser_t parser, yaml_event_t first_event)
	376	{
	377	yaml_event_t event;
	378	yaml_node_t node;
	379	struct {
	380	yaml_node_pair_t *start;
	381	yaml_node_pair_t *end;
	382	yaml_node_pair_t *top;
	383	} pairs = { NULL, NULL, NULL };
	384	int index;
	385	yaml_node_pair_t pair;
	386	yaml_char_t *tag = first_event->data.mapping_start.tag;
	387
	388	if (!tag \|\| strcmp((char *)tag, "!") == 0) {
	389	yaml_free(tag);
c9b74def	390	tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_MAPPING_TAG);
e27a3c88 KS	391	if (!tag) goto error;
	392	}
	393
	394	if (!STACK_INIT(parser, pairs, INITIAL_STACK_SIZE)) goto error;
	395
	396	MAPPING_NODE_INIT(node, tag, pairs.start, pairs.end,
	397	first_event->data.mapping_start.style,
	398	first_event->start_mark, first_event->end_mark);
	399
	400	if (!PUSH(parser, parser->document->nodes, node)) goto error;
	401
	402	index = parser->document->nodes.top - parser->document->nodes.start;
	403
	404	if (!yaml_parser_register_anchor(parser, index,
	405	first_event->data.mapping_start.anchor)) return 0;
	406
	407	if (!yaml_parser_parse(parser, &event)) return 0;
	408
	409	while (event.type != YAML_MAPPING_END_EVENT) {
	410	pair.key = yaml_parser_load_node(parser, &event);
	411	if (!pair.key) return 0;
	412	if (!yaml_parser_parse(parser, &event)) return 0;
	413	pair.value = yaml_parser_load_node(parser, &event);
	414	if (!pair.value) return 0;
	415	if (!PUSH(parser,
	416	parser->document->nodes.start[index-1].data.mapping.pairs,
	417	pair)) return 0;
	418	if (!yaml_parser_parse(parser, &event)) return 0;
	419	}
	420
	421	parser->document->nodes.start[index-1].end_mark = event.end_mark;
	422
	423	return index;
	424
	425	error:
	426	yaml_free(tag);
	427	yaml_free(first_event->data.mapping_start.anchor);
	428	return 0;
	429	}
	430