Emeric Vigier | 2f62582 | 2012-08-06 11:09:52 -0400 | [diff] [blame] | 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 |
| 16 | yaml_parser_set_composer_error(yaml_parser_t *parser, |
| 17 | const char *problem, yaml_mark_t problem_mark); |
| 18 | |
| 19 | static int |
| 20 | yaml_parser_set_composer_error_context(yaml_parser_t *parser, |
| 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 | { |
| 228 | yaml_alias_data_t data; |
| 229 | yaml_alias_data_t *alias_data; |
| 230 | |
| 231 | if (!anchor) return 1; |
| 232 | |
| 233 | data.anchor = anchor; |
| 234 | data.index = index; |
| 235 | data.mark = parser->document->nodes.start[index-1].start_mark; |
| 236 | |
| 237 | for (alias_data = parser->aliases.start; |
| 238 | alias_data != parser->aliases.top; alias_data ++) { |
| 239 | if (strcmp((char *)alias_data->anchor, (char *)anchor) == 0) { |
| 240 | yaml_free(anchor); |
| 241 | return yaml_parser_set_composer_error_context(parser, |
| 242 | "found duplicate anchor; first occurence", |
| 243 | alias_data->mark, "second occurence", data.mark); |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | if (!PUSH(parser, parser->aliases, data)) { |
| 248 | yaml_free(anchor); |
| 249 | return 0; |
| 250 | } |
| 251 | |
| 252 | return 1; |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * Compose a node corresponding to an alias. |
| 257 | */ |
| 258 | |
| 259 | static int |
| 260 | yaml_parser_load_alias(yaml_parser_t *parser, yaml_event_t *first_event) |
| 261 | { |
| 262 | yaml_char_t *anchor = first_event->data.alias.anchor; |
| 263 | yaml_alias_data_t *alias_data; |
| 264 | |
| 265 | for (alias_data = parser->aliases.start; |
| 266 | alias_data != parser->aliases.top; alias_data ++) { |
| 267 | if (strcmp((char *)alias_data->anchor, (char *)anchor) == 0) { |
| 268 | yaml_free(anchor); |
| 269 | return alias_data->index; |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | yaml_free(anchor); |
| 274 | return yaml_parser_set_composer_error(parser, "found undefined alias", |
| 275 | first_event->start_mark); |
| 276 | } |
| 277 | |
| 278 | /* |
| 279 | * Compose a scalar node. |
| 280 | */ |
| 281 | |
| 282 | static int |
| 283 | yaml_parser_load_scalar(yaml_parser_t *parser, yaml_event_t *first_event) |
| 284 | { |
| 285 | yaml_node_t node; |
| 286 | int index; |
| 287 | yaml_char_t *tag = first_event->data.scalar.tag; |
| 288 | |
| 289 | if (!tag || strcmp((char *)tag, "!") == 0) { |
| 290 | yaml_free(tag); |
| 291 | tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_SCALAR_TAG); |
| 292 | if (!tag) goto error; |
| 293 | } |
| 294 | |
| 295 | SCALAR_NODE_INIT(node, tag, first_event->data.scalar.value, |
| 296 | first_event->data.scalar.length, first_event->data.scalar.style, |
| 297 | first_event->start_mark, first_event->end_mark); |
| 298 | |
| 299 | if (!PUSH(parser, parser->document->nodes, node)) goto error; |
| 300 | |
| 301 | index = parser->document->nodes.top - parser->document->nodes.start; |
| 302 | |
| 303 | if (!yaml_parser_register_anchor(parser, index, |
| 304 | first_event->data.scalar.anchor)) return 0; |
| 305 | |
| 306 | return index; |
| 307 | |
| 308 | error: |
| 309 | yaml_free(tag); |
| 310 | yaml_free(first_event->data.scalar.anchor); |
| 311 | yaml_free(first_event->data.scalar.value); |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | /* |
| 316 | * Compose a sequence node. |
| 317 | */ |
| 318 | |
| 319 | static int |
| 320 | yaml_parser_load_sequence(yaml_parser_t *parser, yaml_event_t *first_event) |
| 321 | { |
| 322 | yaml_event_t event; |
| 323 | yaml_node_t node; |
| 324 | struct { |
| 325 | yaml_node_item_t *start; |
| 326 | yaml_node_item_t *end; |
| 327 | yaml_node_item_t *top; |
| 328 | } items = { NULL, NULL, NULL }; |
| 329 | int index, item_index; |
| 330 | yaml_char_t *tag = first_event->data.sequence_start.tag; |
| 331 | |
| 332 | if (!tag || strcmp((char *)tag, "!") == 0) { |
| 333 | yaml_free(tag); |
| 334 | tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_SEQUENCE_TAG); |
| 335 | if (!tag) goto error; |
| 336 | } |
| 337 | |
| 338 | if (!STACK_INIT(parser, items, INITIAL_STACK_SIZE)) goto error; |
| 339 | |
| 340 | SEQUENCE_NODE_INIT(node, tag, items.start, items.end, |
| 341 | first_event->data.sequence_start.style, |
| 342 | first_event->start_mark, first_event->end_mark); |
| 343 | |
| 344 | if (!PUSH(parser, parser->document->nodes, node)) goto error; |
| 345 | |
| 346 | index = parser->document->nodes.top - parser->document->nodes.start; |
| 347 | |
| 348 | if (!yaml_parser_register_anchor(parser, index, |
| 349 | first_event->data.sequence_start.anchor)) return 0; |
| 350 | |
| 351 | if (!yaml_parser_parse(parser, &event)) return 0; |
| 352 | |
| 353 | while (event.type != YAML_SEQUENCE_END_EVENT) { |
| 354 | item_index = yaml_parser_load_node(parser, &event); |
| 355 | if (!item_index) return 0; |
| 356 | if (!PUSH(parser, |
| 357 | parser->document->nodes.start[index-1].data.sequence.items, |
| 358 | item_index)) return 0; |
| 359 | if (!yaml_parser_parse(parser, &event)) return 0; |
| 360 | } |
| 361 | |
| 362 | parser->document->nodes.start[index-1].end_mark = event.end_mark; |
| 363 | |
| 364 | return index; |
| 365 | |
| 366 | error: |
| 367 | yaml_free(tag); |
| 368 | yaml_free(first_event->data.sequence_start.anchor); |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * Compose a mapping node. |
| 374 | */ |
| 375 | |
| 376 | static int |
| 377 | yaml_parser_load_mapping(yaml_parser_t *parser, yaml_event_t *first_event) |
| 378 | { |
| 379 | yaml_event_t event; |
| 380 | yaml_node_t node; |
| 381 | struct { |
| 382 | yaml_node_pair_t *start; |
| 383 | yaml_node_pair_t *end; |
| 384 | yaml_node_pair_t *top; |
| 385 | } pairs = { NULL, NULL, NULL }; |
| 386 | int index; |
| 387 | yaml_node_pair_t pair; |
| 388 | yaml_char_t *tag = first_event->data.mapping_start.tag; |
| 389 | |
| 390 | if (!tag || strcmp((char *)tag, "!") == 0) { |
| 391 | yaml_free(tag); |
| 392 | tag = yaml_strdup((yaml_char_t *)YAML_DEFAULT_MAPPING_TAG); |
| 393 | if (!tag) goto error; |
| 394 | } |
| 395 | |
| 396 | if (!STACK_INIT(parser, pairs, INITIAL_STACK_SIZE)) goto error; |
| 397 | |
| 398 | MAPPING_NODE_INIT(node, tag, pairs.start, pairs.end, |
| 399 | first_event->data.mapping_start.style, |
| 400 | first_event->start_mark, first_event->end_mark); |
| 401 | |
| 402 | if (!PUSH(parser, parser->document->nodes, node)) goto error; |
| 403 | |
| 404 | index = parser->document->nodes.top - parser->document->nodes.start; |
| 405 | |
| 406 | if (!yaml_parser_register_anchor(parser, index, |
| 407 | first_event->data.mapping_start.anchor)) return 0; |
| 408 | |
| 409 | if (!yaml_parser_parse(parser, &event)) return 0; |
| 410 | |
| 411 | while (event.type != YAML_MAPPING_END_EVENT) { |
| 412 | pair.key = yaml_parser_load_node(parser, &event); |
| 413 | if (!pair.key) return 0; |
| 414 | if (!yaml_parser_parse(parser, &event)) return 0; |
| 415 | pair.value = yaml_parser_load_node(parser, &event); |
| 416 | if (!pair.value) return 0; |
| 417 | if (!PUSH(parser, |
| 418 | parser->document->nodes.start[index-1].data.mapping.pairs, |
| 419 | pair)) return 0; |
| 420 | if (!yaml_parser_parse(parser, &event)) return 0; |
| 421 | } |
| 422 | |
| 423 | parser->document->nodes.start[index-1].end_mark = event.end_mark; |
| 424 | |
| 425 | return index; |
| 426 | |
| 427 | error: |
| 428 | yaml_free(tag); |
| 429 | yaml_free(first_event->data.mapping_start.anchor); |
| 430 | return 0; |
| 431 | } |
| 432 | |