Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 1 | /* |
| 2 | * pattern.c: Implemetation of selectors for nodes |
| 3 | * |
| 4 | * Reference: |
| 5 | * http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/ |
| 6 | * to some extent |
| 7 | * http://www.w3.org/TR/1999/REC-xml-19991116 |
| 8 | * |
| 9 | * See Copyright for the status of this software. |
| 10 | * |
| 11 | * daniel@veillard.com |
| 12 | */ |
| 13 | |
Daniel Veillard | f9d1691 | 2005-01-30 22:36:30 +0000 | [diff] [blame] | 14 | /* |
| 15 | * TODO: |
| 16 | * - compilation flags to check for specific syntaxes |
| 17 | * using flags of xmlPatterncompile() |
| 18 | * - making clear how pattern starting with / or . need to be handled, |
| 19 | * currently push(NULL, NULL) means a reset of the streaming context |
| 20 | * and indicating we are on / (the document node), probably need |
| 21 | * something similar for . |
| 22 | * - xmlPatterncompile support of namespaces arguments, I'm not sure |
| 23 | * it's implemented and definitely not tested |
| 24 | * - handling of disjunction "pattern1 | pattern2" mean needed to build |
| 25 | * and check a list internally |
| 26 | */ |
| 27 | |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 28 | #define IN_LIBXML |
| 29 | #include "libxml.h" |
| 30 | |
| 31 | #include <string.h> |
| 32 | #include <libxml/xmlmemory.h> |
| 33 | #include <libxml/tree.h> |
| 34 | #include <libxml/hash.h> |
| 35 | #include <libxml/dict.h> |
| 36 | #include <libxml/xmlerror.h> |
| 37 | #include <libxml/parserInternals.h> |
| 38 | #include <libxml/pattern.h> |
| 39 | |
Daniel Veillard | 364fbed | 2005-02-03 09:08:06 +0000 | [diff] [blame^] | 40 | /* #ifdef LIBXML_PATTERN_ENABLED */ |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 41 | |
Daniel Veillard | 9740d1d | 2005-02-01 16:21:43 +0000 | [diff] [blame] | 42 | #define DEBUG_STREAMING |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 43 | |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 44 | #define ERROR(a, b, c, d) |
| 45 | #define ERROR5(a, b, c, d, e) |
| 46 | |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 47 | #define XML_STREAM_STEP_DESC 1 |
| 48 | #define XML_STREAM_STEP_FINAL 2 |
| 49 | #define XML_STREAM_STEP_ROOT 4 |
| 50 | |
| 51 | typedef struct _xmlStreamStep xmlStreamStep; |
| 52 | typedef xmlStreamStep *xmlStreamStepPtr; |
| 53 | struct _xmlStreamStep { |
| 54 | int flags; /* properties of that step */ |
| 55 | const xmlChar *name; /* first string value if NULL accept all */ |
| 56 | const xmlChar *ns; /* second string value */ |
| 57 | }; |
| 58 | |
| 59 | typedef struct _xmlStreamComp xmlStreamComp; |
| 60 | typedef xmlStreamComp *xmlStreamCompPtr; |
| 61 | struct _xmlStreamComp { |
| 62 | xmlDict *dict; /* the dictionnary if any */ |
| 63 | int nbStep; /* number of steps in the automata */ |
| 64 | int maxStep; /* allocated number of steps */ |
| 65 | xmlStreamStepPtr steps; /* the array of steps */ |
| 66 | }; |
| 67 | |
| 68 | struct _xmlStreamCtxt { |
| 69 | xmlStreamCompPtr comp; /* the compiled stream */ |
| 70 | int nbState; /* number of state in the automata */ |
| 71 | int maxState; /* allocated number of state */ |
| 72 | int level; /* how deep are we ? */ |
| 73 | int *states; /* the array of step indexes */ |
| 74 | }; |
| 75 | |
| 76 | static void xmlFreeStreamComp(xmlStreamCompPtr comp); |
| 77 | |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 78 | /* |
| 79 | * Types are private: |
| 80 | */ |
| 81 | |
| 82 | typedef enum { |
| 83 | XML_OP_END=0, |
| 84 | XML_OP_ROOT, |
| 85 | XML_OP_ELEM, |
| 86 | XML_OP_CHILD, |
| 87 | XML_OP_ATTR, |
| 88 | XML_OP_PARENT, |
| 89 | XML_OP_ANCESTOR, |
| 90 | XML_OP_NS, |
| 91 | XML_OP_ALL |
| 92 | } xmlPatOp; |
| 93 | |
| 94 | |
| 95 | typedef struct _xmlStepOp xmlStepOp; |
| 96 | typedef xmlStepOp *xmlStepOpPtr; |
| 97 | struct _xmlStepOp { |
| 98 | xmlPatOp op; |
| 99 | const xmlChar *value; |
| 100 | const xmlChar *value2; |
| 101 | }; |
| 102 | |
| 103 | struct _xmlPattern { |
| 104 | void *data; /* the associated template */ |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 105 | xmlDictPtr dict; /* the optional dictionnary */ |
| 106 | struct _xmlPattern *next; /* siblings */ |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 107 | const xmlChar *pattern; /* the pattern */ |
| 108 | |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 109 | int nbStep; |
| 110 | int maxStep; |
Daniel Veillard | c7c9fb1 | 2005-01-12 21:04:15 +0000 | [diff] [blame] | 111 | xmlStepOpPtr steps; /* ops for computation */ |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 112 | xmlStreamCompPtr stream; /* the streaming data if any */ |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 113 | }; |
| 114 | |
| 115 | typedef struct _xmlPatParserContext xmlPatParserContext; |
| 116 | typedef xmlPatParserContext *xmlPatParserContextPtr; |
| 117 | struct _xmlPatParserContext { |
| 118 | const xmlChar *cur; /* the current char being parsed */ |
| 119 | const xmlChar *base; /* the full expression */ |
| 120 | int error; /* error code */ |
| 121 | xmlDictPtr dict; /* the dictionnary if any */ |
| 122 | xmlPatternPtr comp; /* the result */ |
| 123 | xmlNodePtr elem; /* the current node if any */ |
Daniel Veillard | ffa7b7e | 2003-12-05 16:10:21 +0000 | [diff] [blame] | 124 | const xmlChar **namespaces; /* the namespaces definitions */ |
| 125 | int nb_namespaces; /* the number of namespaces */ |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 126 | }; |
| 127 | |
| 128 | /************************************************************************ |
| 129 | * * |
| 130 | * Type functions * |
| 131 | * * |
| 132 | ************************************************************************/ |
| 133 | |
| 134 | /** |
| 135 | * xmlNewPattern: |
| 136 | * |
| 137 | * Create a new XSLT Pattern |
| 138 | * |
| 139 | * Returns the newly allocated xmlPatternPtr or NULL in case of error |
| 140 | */ |
| 141 | static xmlPatternPtr |
| 142 | xmlNewPattern(void) { |
| 143 | xmlPatternPtr cur; |
| 144 | |
| 145 | cur = (xmlPatternPtr) xmlMalloc(sizeof(xmlPattern)); |
| 146 | if (cur == NULL) { |
| 147 | ERROR(NULL, NULL, NULL, |
| 148 | "xmlNewPattern : malloc failed\n"); |
| 149 | return(NULL); |
| 150 | } |
| 151 | memset(cur, 0, sizeof(xmlPattern)); |
| 152 | cur->maxStep = 10; |
Daniel Veillard | c7c9fb1 | 2005-01-12 21:04:15 +0000 | [diff] [blame] | 153 | cur->steps = (xmlStepOpPtr) xmlMalloc(cur->maxStep * sizeof(xmlStepOp)); |
| 154 | if (cur->steps == NULL) { |
| 155 | xmlFree(cur); |
| 156 | ERROR(NULL, NULL, NULL, |
| 157 | "xmlNewPattern : malloc failed\n"); |
| 158 | return(NULL); |
| 159 | } |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 160 | return(cur); |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * xmlFreePattern: |
| 165 | * @comp: an XSLT comp |
| 166 | * |
| 167 | * Free up the memory allocated by @comp |
| 168 | */ |
| 169 | void |
| 170 | xmlFreePattern(xmlPatternPtr comp) { |
| 171 | xmlStepOpPtr op; |
| 172 | int i; |
| 173 | |
| 174 | if (comp == NULL) |
| 175 | return; |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 176 | if (comp->stream != NULL) |
| 177 | xmlFreeStreamComp(comp->stream); |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 178 | if (comp->pattern != NULL) |
| 179 | xmlFree((xmlChar *)comp->pattern); |
Daniel Veillard | c7c9fb1 | 2005-01-12 21:04:15 +0000 | [diff] [blame] | 180 | if (comp->steps != NULL) { |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 181 | if (comp->dict == NULL) { |
| 182 | for (i = 0;i < comp->nbStep;i++) { |
| 183 | op = &comp->steps[i]; |
| 184 | if (op->value != NULL) |
| 185 | xmlFree((xmlChar *) op->value); |
| 186 | if (op->value2 != NULL) |
| 187 | xmlFree((xmlChar *) op->value2); |
| 188 | } |
Daniel Veillard | c7c9fb1 | 2005-01-12 21:04:15 +0000 | [diff] [blame] | 189 | } |
| 190 | xmlFree(comp->steps); |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 191 | } |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 192 | if (comp->dict != NULL) |
| 193 | xmlDictFree(comp->dict); |
| 194 | |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 195 | memset(comp, -1, sizeof(xmlPattern)); |
| 196 | xmlFree(comp); |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * xmlFreePatternList: |
| 201 | * @comp: an XSLT comp list |
| 202 | * |
| 203 | * Free up the memory allocated by all the elements of @comp |
| 204 | */ |
| 205 | void |
| 206 | xmlFreePatternList(xmlPatternPtr comp) { |
| 207 | xmlPatternPtr cur; |
| 208 | |
| 209 | while (comp != NULL) { |
| 210 | cur = comp; |
| 211 | comp = comp->next; |
| 212 | xmlFreePattern(cur); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * xmlNewPatParserContext: |
| 218 | * @pattern: the pattern context |
Daniel Veillard | ffa7b7e | 2003-12-05 16:10:21 +0000 | [diff] [blame] | 219 | * @dict: the inherited dictionnary or NULL |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 220 | * @namespaces: the prefix definitions, array of [URI, prefix] terminated |
| 221 | * with [NULL, NULL] or NULL if no namespace is used |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 222 | * |
| 223 | * Create a new XML pattern parser context |
| 224 | * |
| 225 | * Returns the newly allocated xmlPatParserContextPtr or NULL in case of error |
| 226 | */ |
| 227 | static xmlPatParserContextPtr |
Daniel Veillard | ffa7b7e | 2003-12-05 16:10:21 +0000 | [diff] [blame] | 228 | xmlNewPatParserContext(const xmlChar *pattern, xmlDictPtr dict, |
| 229 | const xmlChar **namespaces) { |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 230 | xmlPatParserContextPtr cur; |
| 231 | |
| 232 | if (pattern == NULL) |
| 233 | return(NULL); |
| 234 | |
| 235 | cur = (xmlPatParserContextPtr) xmlMalloc(sizeof(xmlPatParserContext)); |
| 236 | if (cur == NULL) { |
| 237 | ERROR(NULL, NULL, NULL, |
| 238 | "xmlNewPatParserContext : malloc failed\n"); |
| 239 | return(NULL); |
| 240 | } |
| 241 | memset(cur, 0, sizeof(xmlPatParserContext)); |
| 242 | cur->dict = dict; |
| 243 | cur->cur = pattern; |
| 244 | cur->base = pattern; |
Daniel Veillard | ffa7b7e | 2003-12-05 16:10:21 +0000 | [diff] [blame] | 245 | if (namespaces != NULL) { |
| 246 | int i; |
| 247 | for (i = 0;namespaces[2 * i] != NULL;i++); |
| 248 | cur->nb_namespaces = i; |
| 249 | } else { |
| 250 | cur->nb_namespaces = 0; |
| 251 | } |
| 252 | cur->namespaces = namespaces; |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 253 | return(cur); |
| 254 | } |
| 255 | |
| 256 | /** |
| 257 | * xmlFreePatParserContext: |
| 258 | * @ctxt: an XSLT parser context |
| 259 | * |
| 260 | * Free up the memory allocated by @ctxt |
| 261 | */ |
| 262 | static void |
| 263 | xmlFreePatParserContext(xmlPatParserContextPtr ctxt) { |
| 264 | if (ctxt == NULL) |
| 265 | return; |
| 266 | memset(ctxt, -1, sizeof(xmlPatParserContext)); |
| 267 | xmlFree(ctxt); |
| 268 | } |
| 269 | |
| 270 | /** |
| 271 | * xmlPatternAdd: |
| 272 | * @comp: the compiled match expression |
| 273 | * @op: an op |
| 274 | * @value: the first value |
| 275 | * @value2: the second value |
| 276 | * |
| 277 | * Add an step to an XSLT Compiled Match |
| 278 | * |
| 279 | * Returns -1 in case of failure, 0 otherwise. |
| 280 | */ |
| 281 | static int |
| 282 | xmlPatternAdd(xmlPatParserContextPtr ctxt ATTRIBUTE_UNUSED, |
| 283 | xmlPatternPtr comp, |
| 284 | xmlPatOp op, xmlChar * value, xmlChar * value2) |
| 285 | { |
Daniel Veillard | c7c9fb1 | 2005-01-12 21:04:15 +0000 | [diff] [blame] | 286 | if (comp->nbStep >= comp->maxStep) { |
| 287 | xmlStepOpPtr temp; |
| 288 | temp = (xmlStepOpPtr) xmlRealloc(comp->steps, comp->maxStep * 2 * |
| 289 | sizeof(xmlStepOp)); |
| 290 | if (temp == NULL) { |
| 291 | ERROR(ctxt, NULL, NULL, |
| 292 | "xmlPatternAdd: realloc failed\n"); |
| 293 | return (-1); |
| 294 | } |
| 295 | comp->steps = temp; |
| 296 | comp->maxStep *= 2; |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 297 | } |
| 298 | comp->steps[comp->nbStep].op = op; |
| 299 | comp->steps[comp->nbStep].value = value; |
| 300 | comp->steps[comp->nbStep].value2 = value2; |
| 301 | comp->nbStep++; |
| 302 | return (0); |
| 303 | } |
| 304 | |
| 305 | #if 0 |
| 306 | /** |
| 307 | * xsltSwapTopPattern: |
| 308 | * @comp: the compiled match expression |
| 309 | * |
| 310 | * reverse the two top steps. |
| 311 | */ |
| 312 | static void |
| 313 | xsltSwapTopPattern(xmlPatternPtr comp) { |
| 314 | int i; |
| 315 | int j = comp->nbStep - 1; |
| 316 | |
| 317 | if (j > 0) { |
| 318 | register const xmlChar *tmp; |
| 319 | register xmlPatOp op; |
| 320 | i = j - 1; |
| 321 | tmp = comp->steps[i].value; |
| 322 | comp->steps[i].value = comp->steps[j].value; |
| 323 | comp->steps[j].value = tmp; |
| 324 | tmp = comp->steps[i].value2; |
| 325 | comp->steps[i].value2 = comp->steps[j].value2; |
| 326 | comp->steps[j].value2 = tmp; |
| 327 | op = comp->steps[i].op; |
| 328 | comp->steps[i].op = comp->steps[j].op; |
| 329 | comp->steps[j].op = op; |
| 330 | } |
| 331 | } |
| 332 | #endif |
| 333 | |
| 334 | /** |
| 335 | * xmlReversePattern: |
| 336 | * @comp: the compiled match expression |
| 337 | * |
| 338 | * reverse all the stack of expressions |
Daniel Veillard | c7c9fb1 | 2005-01-12 21:04:15 +0000 | [diff] [blame] | 339 | * |
| 340 | * returns 0 in case of success and -1 in case of error. |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 341 | */ |
Daniel Veillard | c7c9fb1 | 2005-01-12 21:04:15 +0000 | [diff] [blame] | 342 | static int |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 343 | xmlReversePattern(xmlPatternPtr comp) { |
| 344 | int i = 0; |
| 345 | int j = comp->nbStep - 1; |
| 346 | |
Daniel Veillard | c7c9fb1 | 2005-01-12 21:04:15 +0000 | [diff] [blame] | 347 | if (comp->nbStep >= comp->maxStep) { |
| 348 | xmlStepOpPtr temp; |
| 349 | temp = (xmlStepOpPtr) xmlRealloc(comp->steps, comp->maxStep * 2 * |
| 350 | sizeof(xmlStepOp)); |
| 351 | if (temp == NULL) { |
| 352 | ERROR(ctxt, NULL, NULL, |
| 353 | "xmlReversePattern: realloc failed\n"); |
| 354 | return (-1); |
| 355 | } |
| 356 | comp->steps = temp; |
| 357 | comp->maxStep *= 2; |
| 358 | } |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 359 | while (j > i) { |
| 360 | register const xmlChar *tmp; |
| 361 | register xmlPatOp op; |
| 362 | tmp = comp->steps[i].value; |
| 363 | comp->steps[i].value = comp->steps[j].value; |
| 364 | comp->steps[j].value = tmp; |
| 365 | tmp = comp->steps[i].value2; |
| 366 | comp->steps[i].value2 = comp->steps[j].value2; |
| 367 | comp->steps[j].value2 = tmp; |
| 368 | op = comp->steps[i].op; |
| 369 | comp->steps[i].op = comp->steps[j].op; |
| 370 | comp->steps[j].op = op; |
| 371 | j--; |
| 372 | i++; |
| 373 | } |
Daniel Veillard | c7c9fb1 | 2005-01-12 21:04:15 +0000 | [diff] [blame] | 374 | comp->steps[comp->nbStep].value = NULL; |
| 375 | comp->steps[comp->nbStep].value2 = NULL; |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 376 | comp->steps[comp->nbStep++].op = XML_OP_END; |
Daniel Veillard | c7c9fb1 | 2005-01-12 21:04:15 +0000 | [diff] [blame] | 377 | return(0); |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 378 | } |
| 379 | |
| 380 | /************************************************************************ |
| 381 | * * |
| 382 | * The interpreter for the precompiled patterns * |
| 383 | * * |
| 384 | ************************************************************************/ |
| 385 | |
| 386 | /** |
| 387 | * xmlPatMatch: |
| 388 | * @comp: the precompiled pattern |
| 389 | * @node: a node |
| 390 | * |
| 391 | * Test wether the node matches the pattern |
| 392 | * |
| 393 | * Returns 1 if it matches, 0 if it doesn't and -1 in case of failure |
| 394 | */ |
| 395 | static int |
| 396 | xmlPatMatch(xmlPatternPtr comp, xmlNodePtr node) { |
| 397 | int i; |
| 398 | xmlStepOpPtr step; |
| 399 | |
| 400 | if ((comp == NULL) || (node == NULL)) return(-1); |
| 401 | for (i = 0;i < comp->nbStep;i++) { |
| 402 | step = &comp->steps[i]; |
| 403 | switch (step->op) { |
| 404 | case XML_OP_END: |
| 405 | return(1); |
| 406 | case XML_OP_ROOT: |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 407 | if (node->type == XML_NAMESPACE_DECL) |
| 408 | return(0); |
| 409 | node = node->parent; |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 410 | if ((node->type == XML_DOCUMENT_NODE) || |
| 411 | #ifdef LIBXML_DOCB_ENABLED |
| 412 | (node->type == XML_DOCB_DOCUMENT_NODE) || |
| 413 | #endif |
| 414 | (node->type == XML_HTML_DOCUMENT_NODE)) |
| 415 | continue; |
| 416 | return(0); |
| 417 | case XML_OP_ELEM: |
| 418 | if (node->type != XML_ELEMENT_NODE) |
| 419 | return(0); |
| 420 | if (step->value == NULL) |
| 421 | continue; |
| 422 | if (step->value[0] != node->name[0]) |
| 423 | return(0); |
| 424 | if (!xmlStrEqual(step->value, node->name)) |
| 425 | return(0); |
| 426 | |
| 427 | /* Namespace test */ |
| 428 | if (node->ns == NULL) { |
| 429 | if (step->value2 != NULL) |
| 430 | return(0); |
| 431 | } else if (node->ns->href != NULL) { |
| 432 | if (step->value2 == NULL) |
| 433 | return(0); |
| 434 | if (!xmlStrEqual(step->value2, node->ns->href)) |
| 435 | return(0); |
| 436 | } |
| 437 | continue; |
| 438 | case XML_OP_CHILD: { |
| 439 | xmlNodePtr lst; |
| 440 | |
| 441 | if ((node->type != XML_ELEMENT_NODE) && |
| 442 | (node->type != XML_DOCUMENT_NODE) && |
| 443 | #ifdef LIBXML_DOCB_ENABLED |
| 444 | (node->type != XML_DOCB_DOCUMENT_NODE) && |
| 445 | #endif |
| 446 | (node->type != XML_HTML_DOCUMENT_NODE)) |
| 447 | return(0); |
| 448 | |
| 449 | lst = node->children; |
| 450 | |
| 451 | if (step->value != NULL) { |
| 452 | while (lst != NULL) { |
| 453 | if ((lst->type == XML_ELEMENT_NODE) && |
| 454 | (step->value[0] == lst->name[0]) && |
| 455 | (xmlStrEqual(step->value, lst->name))) |
| 456 | break; |
| 457 | lst = lst->next; |
| 458 | } |
| 459 | if (lst != NULL) |
| 460 | continue; |
| 461 | } |
| 462 | return(0); |
| 463 | } |
| 464 | case XML_OP_ATTR: |
| 465 | if (node->type != XML_ATTRIBUTE_NODE) |
| 466 | return(0); |
| 467 | if (step->value != NULL) { |
| 468 | if (step->value[0] != node->name[0]) |
| 469 | return(0); |
| 470 | if (!xmlStrEqual(step->value, node->name)) |
| 471 | return(0); |
| 472 | } |
| 473 | /* Namespace test */ |
| 474 | if (node->ns == NULL) { |
| 475 | if (step->value2 != NULL) |
| 476 | return(0); |
| 477 | } else if (step->value2 != NULL) { |
| 478 | if (!xmlStrEqual(step->value2, node->ns->href)) |
| 479 | return(0); |
| 480 | } |
| 481 | continue; |
| 482 | case XML_OP_PARENT: |
| 483 | if ((node->type == XML_DOCUMENT_NODE) || |
| 484 | (node->type == XML_HTML_DOCUMENT_NODE) || |
| 485 | #ifdef LIBXML_DOCB_ENABLED |
| 486 | (node->type == XML_DOCB_DOCUMENT_NODE) || |
| 487 | #endif |
| 488 | (node->type == XML_NAMESPACE_DECL)) |
| 489 | return(0); |
| 490 | node = node->parent; |
| 491 | if (node == NULL) |
| 492 | return(0); |
| 493 | if (step->value == NULL) |
| 494 | continue; |
| 495 | if (step->value[0] != node->name[0]) |
| 496 | return(0); |
| 497 | if (!xmlStrEqual(step->value, node->name)) |
| 498 | return(0); |
| 499 | /* Namespace test */ |
| 500 | if (node->ns == NULL) { |
| 501 | if (step->value2 != NULL) |
| 502 | return(0); |
| 503 | } else if (node->ns->href != NULL) { |
| 504 | if (step->value2 == NULL) |
| 505 | return(0); |
| 506 | if (!xmlStrEqual(step->value2, node->ns->href)) |
| 507 | return(0); |
| 508 | } |
| 509 | continue; |
| 510 | case XML_OP_ANCESTOR: |
| 511 | /* TODO: implement coalescing of ANCESTOR/NODE ops */ |
| 512 | if (step->value == NULL) { |
| 513 | i++; |
| 514 | step = &comp->steps[i]; |
| 515 | if (step->op == XML_OP_ROOT) |
| 516 | return(1); |
| 517 | if (step->op != XML_OP_ELEM) |
| 518 | return(0); |
| 519 | if (step->value == NULL) |
| 520 | return(-1); |
| 521 | } |
| 522 | if (node == NULL) |
| 523 | return(0); |
| 524 | if ((node->type == XML_DOCUMENT_NODE) || |
| 525 | (node->type == XML_HTML_DOCUMENT_NODE) || |
| 526 | #ifdef LIBXML_DOCB_ENABLED |
| 527 | (node->type == XML_DOCB_DOCUMENT_NODE) || |
| 528 | #endif |
| 529 | (node->type == XML_NAMESPACE_DECL)) |
| 530 | return(0); |
| 531 | node = node->parent; |
| 532 | while (node != NULL) { |
| 533 | if (node == NULL) |
| 534 | return(0); |
| 535 | if ((node->type == XML_ELEMENT_NODE) && |
| 536 | (step->value[0] == node->name[0]) && |
| 537 | (xmlStrEqual(step->value, node->name))) { |
| 538 | /* Namespace test */ |
| 539 | if (node->ns == NULL) { |
| 540 | if (step->value2 == NULL) |
| 541 | break; |
| 542 | } else if (node->ns->href != NULL) { |
| 543 | if ((step->value2 != NULL) && |
| 544 | (xmlStrEqual(step->value2, node->ns->href))) |
| 545 | break; |
| 546 | } |
| 547 | } |
| 548 | node = node->parent; |
| 549 | } |
| 550 | if (node == NULL) |
| 551 | return(0); |
| 552 | continue; |
| 553 | case XML_OP_NS: |
| 554 | if (node->type != XML_ELEMENT_NODE) |
| 555 | return(0); |
| 556 | if (node->ns == NULL) { |
| 557 | if (step->value != NULL) |
| 558 | return(0); |
| 559 | } else if (node->ns->href != NULL) { |
| 560 | if (step->value == NULL) |
| 561 | return(0); |
| 562 | if (!xmlStrEqual(step->value, node->ns->href)) |
| 563 | return(0); |
| 564 | } |
| 565 | break; |
| 566 | case XML_OP_ALL: |
| 567 | if (node->type != XML_ELEMENT_NODE) |
| 568 | return(0); |
| 569 | break; |
| 570 | } |
| 571 | } |
| 572 | return(1); |
| 573 | } |
| 574 | |
| 575 | /************************************************************************ |
| 576 | * * |
| 577 | * Dedicated parser for templates * |
| 578 | * * |
| 579 | ************************************************************************/ |
| 580 | |
| 581 | #define TODO \ |
| 582 | xmlGenericError(xmlGenericErrorContext, \ |
| 583 | "Unimplemented block at %s:%d\n", \ |
| 584 | __FILE__, __LINE__); |
| 585 | #define CUR (*ctxt->cur) |
| 586 | #define SKIP(val) ctxt->cur += (val) |
| 587 | #define NXT(val) ctxt->cur[(val)] |
| 588 | #define CUR_PTR ctxt->cur |
| 589 | |
| 590 | #define SKIP_BLANKS \ |
Daniel Veillard | 427174f | 2003-12-10 10:42:59 +0000 | [diff] [blame] | 591 | while (IS_BLANK_CH(CUR)) NEXT |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 592 | |
| 593 | #define CURRENT (*ctxt->cur) |
| 594 | #define NEXT ((*ctxt->cur) ? ctxt->cur++: ctxt->cur) |
| 595 | |
| 596 | |
| 597 | #define PUSH(op, val, val2) \ |
| 598 | if (xmlPatternAdd(ctxt, ctxt->comp, (op), (val), (val2))) goto error; |
| 599 | |
| 600 | #define XSLT_ERROR(X) \ |
| 601 | { xsltError(ctxt, __FILE__, __LINE__, X); \ |
| 602 | ctxt->error = (X); return; } |
| 603 | |
| 604 | #define XSLT_ERROR0(X) \ |
| 605 | { xsltError(ctxt, __FILE__, __LINE__, X); \ |
| 606 | ctxt->error = (X); return(0); } |
| 607 | |
| 608 | #if 0 |
| 609 | /** |
| 610 | * xmlPatScanLiteral: |
| 611 | * @ctxt: the XPath Parser context |
| 612 | * |
| 613 | * Parse an XPath Litteral: |
| 614 | * |
| 615 | * [29] Literal ::= '"' [^"]* '"' |
| 616 | * | "'" [^']* "'" |
| 617 | * |
| 618 | * Returns the Literal parsed or NULL |
| 619 | */ |
| 620 | |
| 621 | static xmlChar * |
| 622 | xmlPatScanLiteral(xmlPatParserContextPtr ctxt) { |
| 623 | const xmlChar *q, *cur; |
| 624 | xmlChar *ret = NULL; |
| 625 | int val, len; |
| 626 | |
| 627 | SKIP_BLANKS; |
| 628 | if (CUR == '"') { |
| 629 | NEXT; |
| 630 | cur = q = CUR_PTR; |
| 631 | val = xmlStringCurrentChar(NULL, cur, &len); |
| 632 | while ((IS_CHAR(val)) && (val != '"')) { |
| 633 | cur += len; |
| 634 | val = xmlStringCurrentChar(NULL, cur, &len); |
| 635 | } |
| 636 | if (!IS_CHAR(val)) { |
| 637 | ctxt->error = 1; |
| 638 | return(NULL); |
| 639 | } else { |
| 640 | ret = xmlStrndup(q, cur - q); |
| 641 | } |
| 642 | cur += len; |
| 643 | CUR_PTR = cur; |
| 644 | } else if (CUR == '\'') { |
| 645 | NEXT; |
| 646 | cur = q = CUR_PTR; |
| 647 | val = xmlStringCurrentChar(NULL, cur, &len); |
| 648 | while ((IS_CHAR(val)) && (val != '\'')) { |
| 649 | cur += len; |
| 650 | val = xmlStringCurrentChar(NULL, cur, &len); |
| 651 | } |
| 652 | if (!IS_CHAR(val)) { |
| 653 | ctxt->error = 1; |
| 654 | return(NULL); |
| 655 | } else { |
| 656 | ret = xmlStrndup(q, cur - q); |
| 657 | } |
| 658 | cur += len; |
| 659 | CUR_PTR = cur; |
| 660 | } else { |
| 661 | /* XP_ERROR(XPATH_START_LITERAL_ERROR); */ |
| 662 | ctxt->error = 1; |
| 663 | return(NULL); |
| 664 | } |
| 665 | return(ret); |
| 666 | } |
| 667 | #endif |
| 668 | |
| 669 | /** |
| 670 | * xmlPatScanName: |
| 671 | * @ctxt: the XPath Parser context |
| 672 | * |
| 673 | * [4] NameChar ::= Letter | Digit | '.' | '-' | '_' | |
| 674 | * CombiningChar | Extender |
| 675 | * |
| 676 | * [5] Name ::= (Letter | '_' | ':') (NameChar)* |
| 677 | * |
| 678 | * [6] Names ::= Name (S Name)* |
| 679 | * |
| 680 | * Returns the Name parsed or NULL |
| 681 | */ |
| 682 | |
| 683 | static xmlChar * |
| 684 | xmlPatScanName(xmlPatParserContextPtr ctxt) { |
| 685 | const xmlChar *q, *cur; |
| 686 | xmlChar *ret = NULL; |
| 687 | int val, len; |
| 688 | |
| 689 | SKIP_BLANKS; |
| 690 | |
| 691 | cur = q = CUR_PTR; |
| 692 | val = xmlStringCurrentChar(NULL, cur, &len); |
| 693 | if (!IS_LETTER(val) && (val != '_') && (val != ':')) |
| 694 | return(NULL); |
| 695 | |
| 696 | while ((IS_LETTER(val)) || (IS_DIGIT(val)) || |
| 697 | (val == '.') || (val == '-') || |
| 698 | (val == '_') || |
| 699 | (IS_COMBINING(val)) || |
| 700 | (IS_EXTENDER(val))) { |
| 701 | cur += len; |
| 702 | val = xmlStringCurrentChar(NULL, cur, &len); |
| 703 | } |
| 704 | ret = xmlStrndup(q, cur - q); |
| 705 | CUR_PTR = cur; |
| 706 | return(ret); |
| 707 | } |
| 708 | |
| 709 | /** |
| 710 | * xmlPatScanNCName: |
| 711 | * @ctxt: the XPath Parser context |
| 712 | * |
| 713 | * Parses a non qualified name |
| 714 | * |
| 715 | * Returns the Name parsed or NULL |
| 716 | */ |
| 717 | |
| 718 | static xmlChar * |
| 719 | xmlPatScanNCName(xmlPatParserContextPtr ctxt) { |
| 720 | const xmlChar *q, *cur; |
| 721 | xmlChar *ret = NULL; |
| 722 | int val, len; |
| 723 | |
| 724 | SKIP_BLANKS; |
| 725 | |
| 726 | cur = q = CUR_PTR; |
| 727 | val = xmlStringCurrentChar(NULL, cur, &len); |
| 728 | if (!IS_LETTER(val) && (val != '_')) |
| 729 | return(NULL); |
| 730 | |
| 731 | while ((IS_LETTER(val)) || (IS_DIGIT(val)) || |
| 732 | (val == '.') || (val == '-') || |
| 733 | (val == '_') || |
| 734 | (IS_COMBINING(val)) || |
| 735 | (IS_EXTENDER(val))) { |
| 736 | cur += len; |
| 737 | val = xmlStringCurrentChar(NULL, cur, &len); |
| 738 | } |
| 739 | ret = xmlStrndup(q, cur - q); |
| 740 | CUR_PTR = cur; |
| 741 | return(ret); |
| 742 | } |
| 743 | |
| 744 | #if 0 |
| 745 | /** |
| 746 | * xmlPatScanQName: |
| 747 | * @ctxt: the XPath Parser context |
| 748 | * @prefix: the place to store the prefix |
| 749 | * |
| 750 | * Parse a qualified name |
| 751 | * |
| 752 | * Returns the Name parsed or NULL |
| 753 | */ |
| 754 | |
| 755 | static xmlChar * |
| 756 | xmlPatScanQName(xmlPatParserContextPtr ctxt, xmlChar **prefix) { |
| 757 | xmlChar *ret = NULL; |
| 758 | |
| 759 | *prefix = NULL; |
| 760 | ret = xmlPatScanNCName(ctxt); |
| 761 | if (CUR == ':') { |
| 762 | *prefix = ret; |
| 763 | NEXT; |
| 764 | ret = xmlPatScanNCName(ctxt); |
| 765 | } |
| 766 | return(ret); |
| 767 | } |
| 768 | #endif |
| 769 | |
| 770 | /** |
| 771 | * xmlCompileStepPattern: |
| 772 | * @ctxt: the compilation context |
| 773 | * |
| 774 | * Compile the Step Pattern and generates a precompiled |
| 775 | * form suitable for fast matching. |
| 776 | * |
| 777 | * [3] Step ::= '.' | NameTest |
| 778 | * [4] NameTest ::= QName | '*' | NCName ':' '*' |
| 779 | */ |
| 780 | |
| 781 | static void |
| 782 | xmlCompileStepPattern(xmlPatParserContextPtr ctxt) { |
| 783 | xmlChar *token = NULL; |
| 784 | xmlChar *name = NULL; |
| 785 | const xmlChar *URI = NULL; |
| 786 | xmlChar *URL = NULL; |
| 787 | |
| 788 | SKIP_BLANKS; |
| 789 | if (CUR == '.') { |
| 790 | NEXT; |
| 791 | PUSH(XML_OP_ELEM, NULL, NULL); |
| 792 | return; |
| 793 | } |
| 794 | name = xmlPatScanNCName(ctxt); |
| 795 | if (name == NULL) { |
| 796 | if (CUR == '*') { |
| 797 | NEXT; |
| 798 | PUSH(XML_OP_ALL, NULL, NULL); |
| 799 | return; |
| 800 | } else { |
| 801 | ERROR(NULL, NULL, NULL, |
| 802 | "xmlCompileStepPattern : Name expected\n"); |
| 803 | ctxt->error = 1; |
| 804 | return; |
| 805 | } |
| 806 | } |
| 807 | SKIP_BLANKS; |
| 808 | if (CUR == ':') { |
| 809 | NEXT; |
| 810 | if (CUR != ':') { |
| 811 | xmlChar *prefix = name; |
| 812 | xmlNsPtr ns; |
| 813 | |
| 814 | /* |
| 815 | * This is a namespace match |
| 816 | */ |
| 817 | token = xmlPatScanName(ctxt); |
| 818 | ns = xmlSearchNs(NULL, ctxt->elem, prefix); |
| 819 | if (ns == NULL) { |
| 820 | ERROR5(NULL, NULL, NULL, |
| 821 | "xmlCompileStepPattern : no namespace bound to prefix %s\n", |
| 822 | prefix); |
| 823 | ctxt->error = 1; |
| 824 | goto error; |
| 825 | } else { |
| 826 | URL = xmlStrdup(ns->href); |
| 827 | } |
| 828 | xmlFree(prefix); |
| 829 | if (token == NULL) { |
| 830 | if (CUR == '*') { |
| 831 | NEXT; |
| 832 | PUSH(XML_OP_NS, URL, NULL); |
| 833 | } else { |
| 834 | ERROR(NULL, NULL, NULL, |
| 835 | "xmlCompileStepPattern : Name expected\n"); |
| 836 | ctxt->error = 1; |
| 837 | goto error; |
| 838 | } |
| 839 | } else { |
| 840 | PUSH(XML_OP_ELEM, token, URL); |
| 841 | } |
| 842 | } else { |
| 843 | NEXT; |
| 844 | if (xmlStrEqual(token, (const xmlChar *) "child")) { |
| 845 | xmlFree(token); |
| 846 | token = xmlPatScanName(ctxt); |
| 847 | if (token == NULL) { |
| 848 | if (CUR == '*') { |
| 849 | NEXT; |
| 850 | PUSH(XML_OP_ALL, token, NULL); |
| 851 | return; |
| 852 | } else { |
| 853 | ERROR(NULL, NULL, NULL, |
| 854 | "xmlCompileStepPattern : QName expected\n"); |
| 855 | ctxt->error = 1; |
| 856 | goto error; |
| 857 | } |
| 858 | } |
| 859 | TODO |
| 860 | /* URI = xsltGetQNameURI(ctxt->elem, &token); */ |
| 861 | if (token == NULL) { |
| 862 | ctxt->error = 1; |
| 863 | goto error; |
| 864 | } else { |
| 865 | name = xmlStrdup(token); |
| 866 | if (URI != NULL) |
| 867 | URL = xmlStrdup(URI); |
| 868 | } |
| 869 | PUSH(XML_OP_CHILD, name, URL); |
| 870 | } else if (xmlStrEqual(token, (const xmlChar *) "attribute")) { |
| 871 | xmlFree(token); |
| 872 | token = xmlPatScanName(ctxt); |
| 873 | if (token == NULL) { |
| 874 | ERROR(NULL, NULL, NULL, |
| 875 | "xmlCompileStepPattern : QName expected\n"); |
| 876 | ctxt->error = 1; |
| 877 | goto error; |
| 878 | } |
| 879 | TODO |
| 880 | /* URI = xsltGetQNameURI(ctxt->elem, &token); */ |
| 881 | if (token == NULL) { |
| 882 | ctxt->error = 1; |
| 883 | goto error; |
| 884 | } else { |
| 885 | name = xmlStrdup(token); |
| 886 | if (URI != NULL) |
| 887 | URL = xmlStrdup(URI); |
| 888 | } |
| 889 | PUSH(XML_OP_ATTR, name, URL); |
| 890 | } else { |
| 891 | ERROR(NULL, NULL, NULL, |
| 892 | "xmlCompileStepPattern : 'child' or 'attribute' expected\n"); |
| 893 | ctxt->error = 1; |
| 894 | goto error; |
| 895 | } |
| 896 | xmlFree(token); |
| 897 | } |
| 898 | } else if (CUR == '*') { |
| 899 | NEXT; |
| 900 | PUSH(XML_OP_ALL, token, NULL); |
| 901 | } else { |
| 902 | if (name == NULL) { |
| 903 | ctxt->error = 1; |
| 904 | goto error; |
| 905 | } |
| 906 | PUSH(XML_OP_ELEM, name, NULL); |
| 907 | } |
| 908 | return; |
| 909 | error: |
| 910 | if (token != NULL) |
| 911 | xmlFree(token); |
| 912 | if (name != NULL) |
| 913 | xmlFree(name); |
| 914 | } |
| 915 | |
| 916 | /** |
| 917 | * xmlCompilePathPattern: |
| 918 | * @ctxt: the compilation context |
| 919 | * |
| 920 | * Compile the Path Pattern and generates a precompiled |
| 921 | * form suitable for fast matching. |
| 922 | * |
| 923 | * [5] Path ::= ('.//')? ( Step '/' )* ( Step | '@' NameTest ) |
| 924 | */ |
| 925 | static void |
| 926 | xmlCompilePathPattern(xmlPatParserContextPtr ctxt) { |
| 927 | SKIP_BLANKS; |
| 928 | if ((CUR == '/') && (NXT(1) == '/')) { |
| 929 | /* |
| 930 | * since we reverse the query |
| 931 | * a leading // can be safely ignored |
| 932 | */ |
| 933 | NEXT; |
| 934 | NEXT; |
| 935 | } else if ((CUR == '.') && (NXT(1) == '/') && (NXT(2) == '/')) { |
| 936 | /* |
| 937 | * a leading .// can be safely ignored |
| 938 | */ |
| 939 | NEXT; |
| 940 | NEXT; |
| 941 | NEXT; |
| 942 | } |
| 943 | if (CUR == '@') { |
| 944 | TODO |
| 945 | } else { |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 946 | if (CUR == '/') { |
| 947 | PUSH(XML_OP_ROOT, NULL, NULL); |
| 948 | NEXT; |
| 949 | } |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 950 | xmlCompileStepPattern(ctxt); |
| 951 | SKIP_BLANKS; |
| 952 | while (CUR == '/') { |
| 953 | if ((CUR == '/') && (NXT(1) == '/')) { |
| 954 | PUSH(XML_OP_ANCESTOR, NULL, NULL); |
| 955 | NEXT; |
| 956 | NEXT; |
| 957 | SKIP_BLANKS; |
| 958 | xmlCompileStepPattern(ctxt); |
| 959 | } else { |
| 960 | PUSH(XML_OP_PARENT, NULL, NULL); |
| 961 | NEXT; |
| 962 | SKIP_BLANKS; |
| 963 | if ((CUR != 0) || (CUR == '|')) { |
| 964 | xmlCompileStepPattern(ctxt); |
| 965 | } |
| 966 | } |
| 967 | } |
| 968 | } |
| 969 | error: |
| 970 | return; |
| 971 | } |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 972 | |
| 973 | /************************************************************************ |
| 974 | * * |
| 975 | * The streaming code * |
| 976 | * * |
| 977 | ************************************************************************/ |
| 978 | |
| 979 | #ifdef DEBUG_STREAMING |
| 980 | static void |
| 981 | xmlDebugStreamComp(xmlStreamCompPtr stream) { |
| 982 | int i; |
| 983 | |
| 984 | if (stream == NULL) { |
| 985 | printf("Stream: NULL\n"); |
| 986 | return; |
| 987 | } |
| 988 | printf("Stream: %d steps\n", stream->nbStep); |
| 989 | for (i = 0;i < stream->nbStep;i++) { |
| 990 | if (stream->steps[i].ns != NULL) { |
| 991 | printf("{%s}", stream->steps[i].ns); |
| 992 | } |
| 993 | if (stream->steps[i].name == NULL) { |
| 994 | printf("* "); |
| 995 | } else { |
| 996 | printf("%s ", stream->steps[i].name); |
| 997 | } |
| 998 | if (stream->steps[i].flags & XML_STREAM_STEP_ROOT) |
| 999 | printf("root "); |
| 1000 | if (stream->steps[i].flags & XML_STREAM_STEP_DESC) |
| 1001 | printf("// "); |
| 1002 | if (stream->steps[i].flags & XML_STREAM_STEP_FINAL) |
| 1003 | printf("final "); |
| 1004 | printf("\n"); |
| 1005 | } |
| 1006 | } |
| 1007 | static void |
| 1008 | xmlDebugStreamCtxt(xmlStreamCtxtPtr ctxt, int match) { |
| 1009 | int i; |
| 1010 | |
| 1011 | if (ctxt == NULL) { |
| 1012 | printf("Stream: NULL\n"); |
| 1013 | return; |
| 1014 | } |
| 1015 | printf("Stream: level %d, %d states: ", ctxt->level, ctxt->nbState); |
| 1016 | if (match) |
| 1017 | printf("matches\n"); |
| 1018 | else |
| 1019 | printf("\n"); |
| 1020 | for (i = 0;i < ctxt->nbState;i++) { |
| 1021 | if (ctxt->states[2 * i] < 0) |
| 1022 | printf(" %d: free\n", i); |
| 1023 | else { |
| 1024 | printf(" %d: step %d, level %d", i, ctxt->states[2 * i], |
| 1025 | ctxt->states[(2 * i) + 1]); |
| 1026 | if (ctxt->comp->steps[ctxt->states[2 * i]].flags & |
| 1027 | XML_STREAM_STEP_DESC) |
| 1028 | printf(" //\n"); |
| 1029 | else |
| 1030 | printf("\n"); |
| 1031 | } |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1032 | } |
| 1033 | } |
| 1034 | #endif |
| 1035 | /** |
| 1036 | * xmlNewStreamComp: |
| 1037 | * @size: the number of expected steps |
| 1038 | * |
| 1039 | * build a new compiled pattern for streaming |
| 1040 | * |
| 1041 | * Returns the new structure or NULL in case of error. |
| 1042 | */ |
| 1043 | static xmlStreamCompPtr |
| 1044 | xmlNewStreamComp(int size) { |
| 1045 | xmlStreamCompPtr cur; |
| 1046 | |
| 1047 | if (size < 4) |
| 1048 | size = 4; |
| 1049 | |
| 1050 | cur = (xmlStreamCompPtr) xmlMalloc(sizeof(xmlStreamComp)); |
| 1051 | if (cur == NULL) { |
| 1052 | ERROR(NULL, NULL, NULL, |
| 1053 | "xmlNewStreamComp: malloc failed\n"); |
| 1054 | return(NULL); |
| 1055 | } |
| 1056 | memset(cur, 0, sizeof(xmlStreamComp)); |
| 1057 | cur->steps = (xmlStreamStepPtr) xmlMalloc(size * sizeof(xmlStreamStep)); |
| 1058 | if (cur->steps == NULL) { |
| 1059 | xmlFree(cur); |
| 1060 | ERROR(NULL, NULL, NULL, |
| 1061 | "xmlNewStreamComp: malloc failed\n"); |
| 1062 | return(NULL); |
| 1063 | } |
| 1064 | cur->nbStep = 0; |
| 1065 | cur->maxStep = size; |
| 1066 | return(cur); |
| 1067 | } |
| 1068 | |
| 1069 | /** |
| 1070 | * xmlFreeStreamComp: |
| 1071 | * @comp: the compiled pattern for streaming |
| 1072 | * |
| 1073 | * Free the compiled pattern for streaming |
| 1074 | */ |
| 1075 | static void |
| 1076 | xmlFreeStreamComp(xmlStreamCompPtr comp) { |
| 1077 | if (comp != NULL) { |
| 1078 | if (comp->steps != NULL) |
| 1079 | xmlFree(comp->steps); |
| 1080 | if (comp->dict != NULL) |
| 1081 | xmlDictFree(comp->dict); |
| 1082 | xmlFree(comp); |
| 1083 | } |
| 1084 | } |
| 1085 | |
| 1086 | /** |
| 1087 | * xmlStreamCompAddStep: |
| 1088 | * @comp: the compiled pattern for streaming |
| 1089 | * @name: the first string, the name, or NULL for * |
| 1090 | * @ns: the second step, the namespace name |
| 1091 | * @flags: the flags for that step |
| 1092 | * |
| 1093 | * Add a new step to the compiled pattern |
| 1094 | * |
| 1095 | * Returns -1 in case of error or the step index if successful |
| 1096 | */ |
| 1097 | static int |
| 1098 | xmlStreamCompAddStep(xmlStreamCompPtr comp, const xmlChar *name, |
| 1099 | const xmlChar *ns, int flags) { |
| 1100 | xmlStreamStepPtr cur; |
| 1101 | |
| 1102 | if (comp->nbStep >= comp->maxStep) { |
| 1103 | cur = (xmlStreamStepPtr) xmlRealloc(comp->steps, |
| 1104 | comp->maxStep * 2 * sizeof(xmlStreamStep)); |
| 1105 | if (cur == NULL) { |
| 1106 | ERROR(NULL, NULL, NULL, |
| 1107 | "xmlNewStreamComp: malloc failed\n"); |
| 1108 | return(-1); |
| 1109 | } |
| 1110 | comp->steps = cur; |
| 1111 | comp->maxStep *= 2; |
| 1112 | } |
| 1113 | cur = &comp->steps[comp->nbStep++]; |
| 1114 | cur->flags = flags; |
| 1115 | cur->name = name; |
| 1116 | cur->ns = ns; |
| 1117 | return(comp->nbStep - 1); |
| 1118 | } |
| 1119 | |
| 1120 | /** |
| 1121 | * xmlStreamCompile: |
| 1122 | * @comp: the precompiled pattern |
| 1123 | * |
| 1124 | * Tries to stream compile a pattern |
| 1125 | * |
| 1126 | * Returns -1 in case of failure and 0 in case of success. |
| 1127 | */ |
| 1128 | static int |
| 1129 | xmlStreamCompile(xmlPatternPtr comp) { |
| 1130 | xmlStreamCompPtr stream; |
| 1131 | int i, s = 0, root = 0, desc = 0; |
| 1132 | |
| 1133 | if ((comp == NULL) || (comp->steps == NULL)) |
| 1134 | return(-1); |
| 1135 | stream = xmlNewStreamComp((comp->nbStep / 2) + 1); |
| 1136 | if (stream == NULL) |
| 1137 | return(-1); |
| 1138 | if (comp->dict != NULL) { |
| 1139 | stream->dict = comp->dict; |
| 1140 | xmlDictReference(stream->dict); |
| 1141 | } |
| 1142 | for (i = 0;i < comp->nbStep;i++) { |
| 1143 | switch (comp->steps[i].op) { |
| 1144 | case XML_OP_END: |
| 1145 | break; |
| 1146 | case XML_OP_ROOT: |
| 1147 | if (i != 0) |
| 1148 | goto error; |
| 1149 | root = 1; |
| 1150 | break; |
| 1151 | case XML_OP_CHILD: |
| 1152 | case XML_OP_ATTR: |
| 1153 | case XML_OP_NS: |
| 1154 | goto error; |
| 1155 | case XML_OP_ELEM: |
| 1156 | s = xmlStreamCompAddStep(stream, comp->steps[i].value, |
| 1157 | comp->steps[i].value2, desc); |
| 1158 | desc = 0; |
| 1159 | if (s < 0) |
| 1160 | goto error; |
| 1161 | break; |
| 1162 | case XML_OP_ALL: |
| 1163 | s = xmlStreamCompAddStep(stream, NULL, NULL, desc); |
| 1164 | desc = 0; |
| 1165 | if (s < 0) |
| 1166 | goto error; |
| 1167 | break; |
| 1168 | case XML_OP_PARENT: |
| 1169 | break; |
| 1170 | case XML_OP_ANCESTOR: |
| 1171 | desc = XML_STREAM_STEP_DESC; |
| 1172 | break; |
| 1173 | } |
| 1174 | } |
| 1175 | stream->steps[s].flags |= XML_STREAM_STEP_FINAL; |
| 1176 | if (root) |
| 1177 | stream->steps[0].flags |= XML_STREAM_STEP_ROOT; |
| 1178 | #ifdef DEBUG_STREAMING |
| 1179 | xmlDebugStreamComp(stream); |
| 1180 | #endif |
| 1181 | comp->stream = stream; |
| 1182 | return(0); |
| 1183 | error: |
| 1184 | xmlFreeStreamComp(stream); |
| 1185 | return(0); |
| 1186 | } |
| 1187 | |
| 1188 | /** |
| 1189 | * xmlNewStreamCtxt: |
| 1190 | * @size: the number of expected states |
| 1191 | * |
| 1192 | * build a new stream context |
| 1193 | * |
| 1194 | * Returns the new structure or NULL in case of error. |
| 1195 | */ |
| 1196 | static xmlStreamCtxtPtr |
| 1197 | xmlNewStreamCtxt(xmlStreamCompPtr stream) { |
| 1198 | xmlStreamCtxtPtr cur; |
| 1199 | |
| 1200 | cur = (xmlStreamCtxtPtr) xmlMalloc(sizeof(xmlStreamCtxt)); |
| 1201 | if (cur == NULL) { |
| 1202 | ERROR(NULL, NULL, NULL, |
| 1203 | "xmlNewStreamCtxt: malloc failed\n"); |
| 1204 | return(NULL); |
| 1205 | } |
| 1206 | memset(cur, 0, sizeof(xmlStreamCtxt)); |
| 1207 | cur->states = (int *) xmlMalloc(4 * 2 * sizeof(int)); |
| 1208 | if (cur->states == NULL) { |
| 1209 | xmlFree(cur); |
| 1210 | ERROR(NULL, NULL, NULL, |
| 1211 | "xmlNewStreamCtxt: malloc failed\n"); |
| 1212 | return(NULL); |
| 1213 | } |
| 1214 | cur->nbState = 0; |
| 1215 | cur->maxState = 4; |
| 1216 | cur->level = 0; |
| 1217 | cur->comp = stream; |
| 1218 | return(cur); |
| 1219 | } |
| 1220 | |
| 1221 | /** |
| 1222 | * xmlFreeStreamCtxt: |
| 1223 | * @stream: the stream context |
| 1224 | * |
| 1225 | * Free the stream context |
| 1226 | */ |
| 1227 | void |
| 1228 | xmlFreeStreamCtxt(xmlStreamCtxtPtr stream) { |
| 1229 | if (stream != NULL) { |
| 1230 | if (stream->states != NULL) |
| 1231 | xmlFree(stream->states); |
| 1232 | xmlFree(stream); |
| 1233 | } |
| 1234 | } |
| 1235 | |
| 1236 | /** |
| 1237 | * xmlStreamCtxtAddState: |
| 1238 | * @comp: the stream context |
| 1239 | * @idx: the step index for that streaming state |
| 1240 | * |
| 1241 | * Add a new state to the stream context |
| 1242 | * |
| 1243 | * Returns -1 in case of error or the state index if successful |
| 1244 | */ |
| 1245 | static int |
| 1246 | xmlStreamCtxtAddState(xmlStreamCtxtPtr comp, int idx, int level) { |
| 1247 | int i; |
| 1248 | for (i = 0;i < comp->nbState;i++) { |
| 1249 | if (comp->states[2 * i] < 0) { |
| 1250 | comp->states[2 * i] = idx; |
| 1251 | comp->states[2 * i + 1] = level; |
| 1252 | return(i); |
| 1253 | } |
| 1254 | } |
| 1255 | if (comp->nbState >= comp->maxState) { |
| 1256 | int *cur; |
| 1257 | |
| 1258 | cur = (int *) xmlRealloc(comp->states, |
| 1259 | comp->maxState * 4 * sizeof(int)); |
| 1260 | if (cur == NULL) { |
| 1261 | ERROR(NULL, NULL, NULL, |
| 1262 | "xmlNewStreamCtxt: malloc failed\n"); |
| 1263 | return(-1); |
| 1264 | } |
| 1265 | comp->states = cur; |
| 1266 | comp->maxState *= 2; |
| 1267 | } |
| 1268 | comp->states[2 * comp->nbState] = idx; |
| 1269 | comp->states[2 * comp->nbState++ + 1] = level; |
| 1270 | return(comp->nbState - 1); |
| 1271 | } |
| 1272 | |
| 1273 | /** |
| 1274 | * xmlStreamPush: |
| 1275 | * @stream: the stream context |
| 1276 | * @name: the current name |
| 1277 | * @ns: the namespace name |
| 1278 | * |
| 1279 | * push new data onto the stream. NOTE: if the call xmlPatterncompile() |
| 1280 | * indicated a dictionnary, then strings for name and ns will be expected |
| 1281 | * to come from the dictionary. |
| 1282 | * Both @name and @ns being NULL means the / i.e. the root of the document. |
| 1283 | * This can also act as a reset. |
| 1284 | * |
| 1285 | * Returns: -1 in case of error, 1 if the current state in the stream is a |
| 1286 | * match and 0 otherwise. |
| 1287 | */ |
| 1288 | int |
| 1289 | xmlStreamPush(xmlStreamCtxtPtr stream, |
| 1290 | const xmlChar *name, const xmlChar *ns) { |
Daniel Veillard | 16ef800 | 2005-01-31 00:27:50 +0000 | [diff] [blame] | 1291 | int ret = 0, tmp, i, m, match, step, desc, final; |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1292 | xmlStreamCompPtr comp; |
| 1293 | |
| 1294 | if ((stream == NULL) || (stream->nbState < 0)) |
| 1295 | return(-1); |
| 1296 | comp = stream->comp; |
| 1297 | if ((name == NULL) && (ns == NULL)) { |
| 1298 | stream->nbState = 0; |
| 1299 | stream->level = 0; |
| 1300 | if (comp->steps[0].flags & XML_STREAM_STEP_ROOT) { |
| 1301 | tmp = xmlStreamCtxtAddState(stream, 0, 0); |
| 1302 | if (tmp < 0) |
| 1303 | return(-1); |
| 1304 | if (comp->steps[tmp].flags & XML_STREAM_STEP_FINAL) |
| 1305 | return(1); |
| 1306 | } |
| 1307 | return(0); |
| 1308 | } |
| 1309 | /* |
| 1310 | * Check evolution of existing states |
| 1311 | */ |
| 1312 | m = stream->nbState; |
| 1313 | for (i = 0;i < m;i++) { |
| 1314 | match = 0; |
| 1315 | step = stream->states[2 * i]; |
| 1316 | /* dead states */ |
| 1317 | if (step < 0) continue; |
| 1318 | /* skip new states just added */ |
| 1319 | if (stream->states[(2 * i) + 1] > stream->level) continue; |
Daniel Veillard | 16ef800 | 2005-01-31 00:27:50 +0000 | [diff] [blame] | 1320 | /* skip continuations */ |
| 1321 | desc = comp->steps[step].flags & XML_STREAM_STEP_DESC; |
| 1322 | if ((stream->states[(2 * i) + 1] < stream->level) && (!desc))continue; |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1323 | |
| 1324 | /* discard old states */ |
| 1325 | /* something needed about old level discarded */ |
| 1326 | |
| 1327 | if (comp->dict) { |
| 1328 | if (comp->steps[step].name == NULL) { |
| 1329 | if (comp->steps[step].ns == NULL) |
| 1330 | match = 1; |
| 1331 | else |
| 1332 | match = (comp->steps[step].ns == ns); |
| 1333 | } else { |
| 1334 | match = ((comp->steps[step].name == name) && |
| 1335 | (comp->steps[step].ns == ns)); |
| 1336 | } |
| 1337 | } else { |
| 1338 | if (comp->steps[step].name == NULL) { |
| 1339 | if (comp->steps[step].ns == NULL) |
| 1340 | match = 1; |
| 1341 | else |
| 1342 | match = xmlStrEqual(comp->steps[step].ns, ns); |
| 1343 | } else { |
| 1344 | match = ((xmlStrEqual(comp->steps[step].name, name)) && |
| 1345 | (xmlStrEqual(comp->steps[step].ns, ns))); |
| 1346 | } |
| 1347 | } |
| 1348 | if (match) { |
Daniel Veillard | 16ef800 | 2005-01-31 00:27:50 +0000 | [diff] [blame] | 1349 | final = comp->steps[step].flags & XML_STREAM_STEP_FINAL; |
| 1350 | if (desc) { |
| 1351 | if (final) { |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1352 | ret = 1; |
| 1353 | } else { |
| 1354 | /* descending match create a new state */ |
| 1355 | xmlStreamCtxtAddState(stream, step + 1, stream->level + 1); |
| 1356 | } |
| 1357 | } else { |
Daniel Veillard | 16ef800 | 2005-01-31 00:27:50 +0000 | [diff] [blame] | 1358 | if (final) { |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1359 | ret = 1; |
Daniel Veillard | 16ef800 | 2005-01-31 00:27:50 +0000 | [diff] [blame] | 1360 | #if 0 |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1361 | stream->states[2 * i] = -1; |
Daniel Veillard | 16ef800 | 2005-01-31 00:27:50 +0000 | [diff] [blame] | 1362 | #endif |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1363 | } else { |
Daniel Veillard | 16ef800 | 2005-01-31 00:27:50 +0000 | [diff] [blame] | 1364 | #if 0 |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1365 | stream->states[2 * i] = step + 1; |
| 1366 | stream->states[2 * i + 1] = stream->level + 1; |
Daniel Veillard | 16ef800 | 2005-01-31 00:27:50 +0000 | [diff] [blame] | 1367 | #endif |
| 1368 | xmlStreamCtxtAddState(stream, step + 1, stream->level + 1); |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1369 | } |
| 1370 | } |
Daniel Veillard | 9740d1d | 2005-02-01 16:21:43 +0000 | [diff] [blame] | 1371 | #if 0 |
Daniel Veillard | 16ef800 | 2005-01-31 00:27:50 +0000 | [diff] [blame] | 1372 | } else if (!desc) { |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1373 | /* didn't match, discard */ |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1374 | stream->states[2 * i] = -1; |
Daniel Veillard | 9740d1d | 2005-02-01 16:21:43 +0000 | [diff] [blame] | 1375 | #endif |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1376 | } |
| 1377 | } |
| 1378 | |
| 1379 | /* |
| 1380 | * Check creating a new state. |
| 1381 | */ |
| 1382 | stream->level++; |
| 1383 | if (!(comp->steps[0].flags & XML_STREAM_STEP_ROOT)) { |
| 1384 | match = 0; |
| 1385 | if (comp->dict) { |
| 1386 | if (comp->steps[0].name == NULL) { |
| 1387 | if (comp->steps[0].ns == NULL) |
| 1388 | match = 1; |
| 1389 | else |
| 1390 | match = (comp->steps[0].ns == ns); |
| 1391 | } else { |
| 1392 | match = ((comp->steps[0].name == name) && |
| 1393 | (comp->steps[0].ns == ns)); |
| 1394 | } |
| 1395 | } else { |
| 1396 | if (comp->steps[0].name == NULL) { |
| 1397 | if (comp->steps[0].ns == NULL) |
| 1398 | match = 1; |
| 1399 | else |
| 1400 | match = xmlStrEqual(comp->steps[0].ns, ns); |
| 1401 | } else { |
| 1402 | match = ((xmlStrEqual(comp->steps[0].name, name)) && |
| 1403 | (xmlStrEqual(comp->steps[0].ns, ns))); |
| 1404 | } |
| 1405 | } |
| 1406 | if (match) { |
| 1407 | if (comp->steps[0].flags & XML_STREAM_STEP_FINAL) |
| 1408 | ret = 1; |
| 1409 | else |
| 1410 | xmlStreamCtxtAddState(stream, 1, stream->level); |
| 1411 | } |
| 1412 | } |
| 1413 | |
| 1414 | #ifdef DEBUG_STREAMING |
| 1415 | xmlDebugStreamCtxt(stream, ret); |
| 1416 | #endif |
| 1417 | return(ret); |
| 1418 | } |
| 1419 | |
| 1420 | /** |
| 1421 | * xmlStreamPop: |
| 1422 | * @stream: the stream context |
| 1423 | * |
| 1424 | * push one level from the stream. |
| 1425 | * |
| 1426 | * Returns: -1 in case of error, 0 otherwise. |
| 1427 | */ |
| 1428 | int |
| 1429 | xmlStreamPop(xmlStreamCtxtPtr stream) { |
Daniel Veillard | 9740d1d | 2005-02-01 16:21:43 +0000 | [diff] [blame] | 1430 | int i, m; |
| 1431 | |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1432 | if (stream == NULL) |
| 1433 | return(-1); |
| 1434 | stream->level--; |
| 1435 | if (stream->level < 0) |
| 1436 | return(-1); |
| 1437 | |
Daniel Veillard | 9740d1d | 2005-02-01 16:21:43 +0000 | [diff] [blame] | 1438 | /* |
| 1439 | * Check evolution of existing states |
| 1440 | */ |
| 1441 | m = stream->nbState; |
| 1442 | for (i = 0;i < m;i++) { |
| 1443 | if (stream->states[(2 * i)] < 0) break; |
| 1444 | /* discard obsoleted states */ |
| 1445 | if (stream->states[(2 * i) + 1] > stream->level) |
| 1446 | stream->states[(2 * i)] = -1; |
| 1447 | } |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1448 | return(0); |
| 1449 | } |
| 1450 | |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 1451 | /************************************************************************ |
| 1452 | * * |
| 1453 | * The public interfaces * |
| 1454 | * * |
| 1455 | ************************************************************************/ |
| 1456 | |
| 1457 | /** |
| 1458 | * xmlPatterncompile: |
| 1459 | * @pattern: the pattern to compile |
| 1460 | * @dict: an optional dictionnary for interned strings |
| 1461 | * @flags: compilation flags, undefined yet |
Daniel Veillard | ffa7b7e | 2003-12-05 16:10:21 +0000 | [diff] [blame] | 1462 | * @namespaces: the prefix definitions, array of [URI, prefix] or NULL |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 1463 | * |
Daniel Veillard | ffa7b7e | 2003-12-05 16:10:21 +0000 | [diff] [blame] | 1464 | * Compile a pattern. |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 1465 | * |
| 1466 | * Returns the compiled for of the pattern or NULL in case of error |
| 1467 | */ |
| 1468 | xmlPatternPtr |
Daniel Veillard | 427174f | 2003-12-10 10:42:59 +0000 | [diff] [blame] | 1469 | xmlPatterncompile(const xmlChar *pattern, xmlDict *dict, |
| 1470 | int flags ATTRIBUTE_UNUSED, |
Daniel Veillard | ffa7b7e | 2003-12-05 16:10:21 +0000 | [diff] [blame] | 1471 | const xmlChar **namespaces) { |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 1472 | xmlPatternPtr ret = NULL; |
| 1473 | xmlPatParserContextPtr ctxt = NULL; |
| 1474 | |
Daniel Veillard | ffa7b7e | 2003-12-05 16:10:21 +0000 | [diff] [blame] | 1475 | ctxt = xmlNewPatParserContext(pattern, dict, namespaces); |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 1476 | if (ctxt == NULL) goto error; |
| 1477 | ret = xmlNewPattern(); |
| 1478 | if (ret == NULL) goto error; |
| 1479 | ctxt->comp = ret; |
| 1480 | |
| 1481 | xmlCompilePathPattern(ctxt); |
| 1482 | xmlFreePatParserContext(ctxt); |
| 1483 | |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1484 | xmlStreamCompile(ret); |
Daniel Veillard | c7c9fb1 | 2005-01-12 21:04:15 +0000 | [diff] [blame] | 1485 | if (xmlReversePattern(ret) < 0) |
| 1486 | goto error; |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 1487 | return(ret); |
| 1488 | error: |
| 1489 | if (ctxt != NULL) xmlFreePatParserContext(ctxt); |
| 1490 | if (ret != NULL) xmlFreePattern(ret); |
| 1491 | return(NULL); |
| 1492 | } |
| 1493 | |
| 1494 | /** |
| 1495 | * xmlPatternMatch: |
| 1496 | * @comp: the precompiled pattern |
| 1497 | * @node: a node |
| 1498 | * |
| 1499 | * Test wether the node matches the pattern |
| 1500 | * |
| 1501 | * Returns 1 if it matches, 0 if it doesn't and -1 in case of failure |
| 1502 | */ |
| 1503 | int |
| 1504 | xmlPatternMatch(xmlPatternPtr comp, xmlNodePtr node) |
| 1505 | { |
| 1506 | if ((comp == NULL) || (node == NULL)) |
| 1507 | return(-1); |
| 1508 | return(xmlPatMatch(comp, node)); |
| 1509 | } |
| 1510 | |
Daniel Veillard | 2fc6df9 | 2005-01-30 18:42:55 +0000 | [diff] [blame] | 1511 | /** |
| 1512 | * xmlPatternGetStreamCtxt: |
| 1513 | * @comp: the precompiled pattern |
| 1514 | * |
| 1515 | * Get a streaming context for that pattern |
| 1516 | * Use xmlFreeStreamCtxt to free the context. |
| 1517 | * |
| 1518 | * Returns a pointer to the context or NULL in case of failure |
| 1519 | */ |
| 1520 | xmlStreamCtxtPtr |
| 1521 | xmlPatternGetStreamCtxt(xmlPatternPtr comp) |
| 1522 | { |
| 1523 | if ((comp == NULL) || (comp->stream == NULL)) |
| 1524 | return(NULL); |
| 1525 | return(xmlNewStreamCtxt(comp->stream)); |
| 1526 | } |
| 1527 | |
Daniel Veillard | b3de70c | 2003-12-02 22:32:15 +0000 | [diff] [blame] | 1528 | #endif /* LIBXML_PATTERN_ENABLED */ |