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_emitter_open(yaml_emitter_t *emitter); |
| 10 | |
| 11 | YAML_DECLARE(int) |
| 12 | yaml_emitter_close(yaml_emitter_t *emitter); |
| 13 | |
| 14 | YAML_DECLARE(int) |
| 15 | yaml_emitter_dump(yaml_emitter_t *emitter, yaml_document_t *document); |
| 16 | |
| 17 | /* |
| 18 | * Clean up functions. |
| 19 | */ |
| 20 | |
| 21 | static void |
| 22 | yaml_emitter_delete_document_and_anchors(yaml_emitter_t *emitter); |
| 23 | |
| 24 | /* |
| 25 | * Anchor functions. |
| 26 | */ |
| 27 | |
| 28 | static void |
| 29 | yaml_emitter_anchor_node(yaml_emitter_t *emitter, int index); |
| 30 | |
| 31 | static yaml_char_t * |
| 32 | yaml_emitter_generate_anchor(yaml_emitter_t *emitter, int anchor_id); |
| 33 | |
| 34 | |
| 35 | /* |
| 36 | * Serialize functions. |
| 37 | */ |
| 38 | |
| 39 | static int |
| 40 | yaml_emitter_dump_node(yaml_emitter_t *emitter, int index); |
| 41 | |
| 42 | static int |
| 43 | yaml_emitter_dump_alias(yaml_emitter_t *emitter, yaml_char_t *anchor); |
| 44 | |
| 45 | static int |
| 46 | yaml_emitter_dump_scalar(yaml_emitter_t *emitter, yaml_node_t *node, |
| 47 | yaml_char_t *anchor); |
| 48 | |
| 49 | static int |
| 50 | yaml_emitter_dump_sequence(yaml_emitter_t *emitter, yaml_node_t *node, |
| 51 | yaml_char_t *anchor); |
| 52 | |
| 53 | static int |
| 54 | yaml_emitter_dump_mapping(yaml_emitter_t *emitter, yaml_node_t *node, |
| 55 | yaml_char_t *anchor); |
| 56 | |
| 57 | /* |
| 58 | * Issue a STREAM-START event. |
| 59 | */ |
| 60 | |
| 61 | YAML_DECLARE(int) |
| 62 | yaml_emitter_open(yaml_emitter_t *emitter) |
| 63 | { |
| 64 | yaml_event_t event; |
| 65 | yaml_mark_t mark = { 0, 0, 0 }; |
| 66 | |
| 67 | assert(emitter); /* Non-NULL emitter object is required. */ |
| 68 | assert(!emitter->opened); /* Emitter should not be opened yet. */ |
| 69 | |
| 70 | STREAM_START_EVENT_INIT(event, YAML_ANY_ENCODING, mark, mark); |
| 71 | |
| 72 | if (!yaml_emitter_emit(emitter, &event)) { |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | emitter->opened = 1; |
| 77 | |
| 78 | return 1; |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * Issue a STREAM-END event. |
| 83 | */ |
| 84 | |
| 85 | YAML_DECLARE(int) |
| 86 | yaml_emitter_close(yaml_emitter_t *emitter) |
| 87 | { |
| 88 | yaml_event_t event; |
| 89 | yaml_mark_t mark = { 0, 0, 0 }; |
| 90 | |
| 91 | assert(emitter); /* Non-NULL emitter object is required. */ |
| 92 | assert(emitter->opened); /* Emitter should be opened. */ |
| 93 | |
| 94 | if (emitter->closed) return 1; |
| 95 | |
| 96 | STREAM_END_EVENT_INIT(event, mark, mark); |
| 97 | |
| 98 | if (!yaml_emitter_emit(emitter, &event)) { |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | emitter->closed = 1; |
| 103 | |
| 104 | return 1; |
| 105 | } |
| 106 | |
| 107 | /* |
| 108 | * Dump a YAML document. |
| 109 | */ |
| 110 | |
| 111 | YAML_DECLARE(int) |
| 112 | yaml_emitter_dump(yaml_emitter_t *emitter, yaml_document_t *document) |
| 113 | { |
| 114 | yaml_event_t event; |
| 115 | yaml_mark_t mark = { 0, 0, 0 }; |
| 116 | |
| 117 | assert(emitter); /* Non-NULL emitter object is required. */ |
| 118 | assert(document); /* Non-NULL emitter object is expected. */ |
| 119 | |
| 120 | emitter->document = document; |
| 121 | |
| 122 | if (!emitter->opened) { |
| 123 | if (!yaml_emitter_open(emitter)) goto error; |
| 124 | } |
| 125 | |
| 126 | if (STACK_EMPTY(emitter, document->nodes)) { |
| 127 | if (!yaml_emitter_close(emitter)) goto error; |
| 128 | yaml_emitter_delete_document_and_anchors(emitter); |
| 129 | return 1; |
| 130 | } |
| 131 | |
| 132 | assert(emitter->opened); /* Emitter should be opened. */ |
| 133 | |
| 134 | emitter->anchors = yaml_malloc(sizeof(*(emitter->anchors)) |
| 135 | * (document->nodes.top - document->nodes.start)); |
| 136 | if (!emitter->anchors) goto error; |
| 137 | memset(emitter->anchors, 0, sizeof(*(emitter->anchors)) |
| 138 | * (document->nodes.top - document->nodes.start)); |
| 139 | |
| 140 | DOCUMENT_START_EVENT_INIT(event, document->version_directive, |
| 141 | document->tag_directives.start, document->tag_directives.end, |
| 142 | document->start_implicit, mark, mark); |
| 143 | if (!yaml_emitter_emit(emitter, &event)) goto error; |
| 144 | |
| 145 | yaml_emitter_anchor_node(emitter, 1); |
| 146 | if (!yaml_emitter_dump_node(emitter, 1)) goto error; |
| 147 | |
| 148 | DOCUMENT_END_EVENT_INIT(event, document->end_implicit, mark, mark); |
| 149 | if (!yaml_emitter_emit(emitter, &event)) goto error; |
| 150 | |
| 151 | yaml_emitter_delete_document_and_anchors(emitter); |
| 152 | |
| 153 | return 1; |
| 154 | |
| 155 | error: |
| 156 | |
| 157 | yaml_emitter_delete_document_and_anchors(emitter); |
| 158 | |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * Clean up the emitter object after a document is dumped. |
| 164 | */ |
| 165 | |
| 166 | static void |
| 167 | yaml_emitter_delete_document_and_anchors(yaml_emitter_t *emitter) |
| 168 | { |
| 169 | int index; |
| 170 | |
| 171 | if (!emitter->anchors) { |
| 172 | yaml_document_delete(emitter->document); |
| 173 | emitter->document = NULL; |
| 174 | return; |
| 175 | } |
| 176 | |
| 177 | for (index = 0; emitter->document->nodes.start + index |
| 178 | < emitter->document->nodes.top; index ++) { |
| 179 | yaml_node_t node = emitter->document->nodes.start[index]; |
| 180 | if (!emitter->anchors[index].serialized) { |
| 181 | yaml_free(node.tag); |
| 182 | if (node.type == YAML_SCALAR_NODE) { |
| 183 | yaml_free(node.data.scalar.value); |
| 184 | } |
| 185 | } |
| 186 | if (node.type == YAML_SEQUENCE_NODE) { |
| 187 | STACK_DEL(emitter, node.data.sequence.items); |
| 188 | } |
| 189 | if (node.type == YAML_MAPPING_NODE) { |
| 190 | STACK_DEL(emitter, node.data.mapping.pairs); |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | STACK_DEL(emitter, emitter->document->nodes); |
| 195 | yaml_free(emitter->anchors); |
| 196 | |
| 197 | emitter->anchors = NULL; |
| 198 | emitter->last_anchor_id = 0; |
| 199 | emitter->document = NULL; |
| 200 | } |
| 201 | |
| 202 | /* |
| 203 | * Check the references of a node and assign the anchor id if needed. |
| 204 | */ |
| 205 | |
| 206 | static void |
| 207 | yaml_emitter_anchor_node(yaml_emitter_t *emitter, int index) |
| 208 | { |
| 209 | yaml_node_t *node = emitter->document->nodes.start + index - 1; |
| 210 | yaml_node_item_t *item; |
| 211 | yaml_node_pair_t *pair; |
| 212 | |
| 213 | emitter->anchors[index-1].references ++; |
| 214 | |
| 215 | if (emitter->anchors[index-1].references == 1) { |
| 216 | switch (node->type) { |
| 217 | case YAML_SEQUENCE_NODE: |
| 218 | for (item = node->data.sequence.items.start; |
| 219 | item < node->data.sequence.items.top; item ++) { |
| 220 | yaml_emitter_anchor_node(emitter, *item); |
| 221 | } |
| 222 | break; |
| 223 | case YAML_MAPPING_NODE: |
| 224 | for (pair = node->data.mapping.pairs.start; |
| 225 | pair < node->data.mapping.pairs.top; pair ++) { |
| 226 | yaml_emitter_anchor_node(emitter, pair->key); |
| 227 | yaml_emitter_anchor_node(emitter, pair->value); |
| 228 | } |
| 229 | break; |
| 230 | default: |
| 231 | break; |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | else if (emitter->anchors[index-1].references == 2) { |
| 236 | emitter->anchors[index-1].anchor = (++ emitter->last_anchor_id); |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | /* |
| 241 | * Generate a textual representation for an anchor. |
| 242 | */ |
| 243 | |
| 244 | #define ANCHOR_TEMPLATE "id%03d" |
| 245 | #define ANCHOR_TEMPLATE_LENGTH 16 |
| 246 | |
| 247 | static yaml_char_t * |
| 248 | yaml_emitter_generate_anchor(yaml_emitter_t *emitter, int anchor_id) |
| 249 | { |
| 250 | yaml_char_t *anchor = yaml_malloc(ANCHOR_TEMPLATE_LENGTH); |
| 251 | |
| 252 | if (!anchor) return NULL; |
| 253 | |
| 254 | sprintf((char *)anchor, ANCHOR_TEMPLATE, anchor_id); |
| 255 | |
| 256 | return anchor; |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * Serialize a node. |
| 261 | */ |
| 262 | |
| 263 | static int |
| 264 | yaml_emitter_dump_node(yaml_emitter_t *emitter, int index) |
| 265 | { |
| 266 | yaml_node_t *node = emitter->document->nodes.start + index - 1; |
| 267 | int anchor_id = emitter->anchors[index-1].anchor; |
| 268 | yaml_char_t *anchor = NULL; |
| 269 | |
| 270 | if (anchor_id) { |
| 271 | anchor = yaml_emitter_generate_anchor(emitter, anchor_id); |
| 272 | if (!anchor) return 0; |
| 273 | } |
| 274 | |
| 275 | if (emitter->anchors[index-1].serialized) { |
| 276 | return yaml_emitter_dump_alias(emitter, anchor); |
| 277 | } |
| 278 | |
| 279 | emitter->anchors[index-1].serialized = 1; |
| 280 | |
| 281 | switch (node->type) { |
| 282 | case YAML_SCALAR_NODE: |
| 283 | return yaml_emitter_dump_scalar(emitter, node, anchor); |
| 284 | case YAML_SEQUENCE_NODE: |
| 285 | return yaml_emitter_dump_sequence(emitter, node, anchor); |
| 286 | case YAML_MAPPING_NODE: |
| 287 | return yaml_emitter_dump_mapping(emitter, node, anchor); |
| 288 | default: |
| 289 | assert(0); /* Could not happen. */ |
| 290 | break; |
| 291 | } |
| 292 | |
| 293 | return 0; /* Could not happen. */ |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * Serialize an alias. |
| 298 | */ |
| 299 | |
| 300 | static int |
| 301 | yaml_emitter_dump_alias(yaml_emitter_t *emitter, yaml_char_t *anchor) |
| 302 | { |
| 303 | yaml_event_t event; |
| 304 | yaml_mark_t mark = { 0, 0, 0 }; |
| 305 | |
| 306 | ALIAS_EVENT_INIT(event, anchor, mark, mark); |
| 307 | |
| 308 | return yaml_emitter_emit(emitter, &event); |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * Serialize a scalar. |
| 313 | */ |
| 314 | |
| 315 | static int |
| 316 | yaml_emitter_dump_scalar(yaml_emitter_t *emitter, yaml_node_t *node, |
| 317 | yaml_char_t *anchor) |
| 318 | { |
| 319 | yaml_event_t event; |
| 320 | yaml_mark_t mark = { 0, 0, 0 }; |
| 321 | |
| 322 | int plain_implicit = (strcmp((char *)node->tag, |
| 323 | YAML_DEFAULT_SCALAR_TAG) == 0); |
| 324 | int quoted_implicit = (strcmp((char *)node->tag, |
| 325 | YAML_DEFAULT_SCALAR_TAG) == 0); |
| 326 | |
| 327 | SCALAR_EVENT_INIT(event, anchor, node->tag, node->data.scalar.value, |
| 328 | node->data.scalar.length, plain_implicit, quoted_implicit, |
| 329 | node->data.scalar.style, mark, mark); |
| 330 | |
| 331 | return yaml_emitter_emit(emitter, &event); |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * Serialize a sequence. |
| 336 | */ |
| 337 | |
| 338 | static int |
| 339 | yaml_emitter_dump_sequence(yaml_emitter_t *emitter, yaml_node_t *node, |
| 340 | yaml_char_t *anchor) |
| 341 | { |
| 342 | yaml_event_t event; |
| 343 | yaml_mark_t mark = { 0, 0, 0 }; |
| 344 | |
| 345 | int implicit = (strcmp((char *)node->tag, YAML_DEFAULT_SEQUENCE_TAG) == 0); |
| 346 | |
| 347 | yaml_node_item_t *item; |
| 348 | |
| 349 | SEQUENCE_START_EVENT_INIT(event, anchor, node->tag, implicit, |
| 350 | node->data.sequence.style, mark, mark); |
| 351 | if (!yaml_emitter_emit(emitter, &event)) return 0; |
| 352 | |
| 353 | for (item = node->data.sequence.items.start; |
| 354 | item < node->data.sequence.items.top; item ++) { |
| 355 | if (!yaml_emitter_dump_node(emitter, *item)) return 0; |
| 356 | } |
| 357 | |
| 358 | SEQUENCE_END_EVENT_INIT(event, mark, mark); |
| 359 | if (!yaml_emitter_emit(emitter, &event)) return 0; |
| 360 | |
| 361 | return 1; |
| 362 | } |
| 363 | |
| 364 | /* |
| 365 | * Serialize a mapping. |
| 366 | */ |
| 367 | |
| 368 | static int |
| 369 | yaml_emitter_dump_mapping(yaml_emitter_t *emitter, yaml_node_t *node, |
| 370 | yaml_char_t *anchor) |
| 371 | { |
| 372 | yaml_event_t event; |
| 373 | yaml_mark_t mark = { 0, 0, 0 }; |
| 374 | |
| 375 | int implicit = (strcmp((char *)node->tag, YAML_DEFAULT_MAPPING_TAG) == 0); |
| 376 | |
| 377 | yaml_node_pair_t *pair; |
| 378 | |
| 379 | MAPPING_START_EVENT_INIT(event, anchor, node->tag, implicit, |
| 380 | node->data.mapping.style, mark, mark); |
| 381 | if (!yaml_emitter_emit(emitter, &event)) return 0; |
| 382 | |
| 383 | for (pair = node->data.mapping.pairs.start; |
| 384 | pair < node->data.mapping.pairs.top; pair ++) { |
| 385 | if (!yaml_emitter_dump_node(emitter, pair->key)) return 0; |
| 386 | if (!yaml_emitter_dump_node(emitter, pair->value)) return 0; |
| 387 | } |
| 388 | |
| 389 | MAPPING_END_EVENT_INIT(event, mark, mark); |
| 390 | if (!yaml_emitter_emit(emitter, &event)) return 0; |
| 391 | |
| 392 | return 1; |
| 393 | } |
| 394 | |