Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 1 | /* |
| 2 | * xpath.c: XML Path Language implementation |
| 3 | * XPath is a language for addressing parts of an XML document, |
| 4 | * designed to be used by both XSLT and XPointer. |
| 5 | * |
| 6 | * Reference: W3C Working Draft internal 5 July 1999 |
| 7 | * http://www.w3.org/Style/XSL/Group/1999/07/xpath-19990705.html |
| 8 | * Public reference: |
| 9 | * http://www.w3.org/TR/WD-xpath/ |
| 10 | * |
| 11 | * See COPYRIGHT for the status of this software |
| 12 | * |
| 13 | * Author: Daniel.Veillard@w3.org |
| 14 | */ |
| 15 | |
| 16 | #include <malloc.h> |
| 17 | #include <math.h> |
| 18 | #include <stdio.h> |
| 19 | #include "tree.h" |
| 20 | #include "xpath.h" |
| 21 | #include "parserInternals.h" |
| 22 | |
| 23 | /* |
| 24 | * TODO: create a pseudo document element and affect it as the |
| 25 | * actual root. |
| 26 | */ |
| 27 | /* |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 28 | * Setup stuff for floating point |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 29 | */ |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 30 | double xmlXPathNAN = 0; |
| 31 | double xmlXPathPINF = 1; |
| 32 | double xmlXPathMINF = -1; |
| 33 | |
| 34 | /** |
| 35 | * xmlXPathInit: |
| 36 | * |
| 37 | * Initialize the XPath environment |
| 38 | */ |
| 39 | void |
| 40 | xmlXPathInit(void) { |
| 41 | static int initialized = 0; |
| 42 | |
| 43 | if (initialized) return; |
| 44 | |
| 45 | xmlXPathNAN = 0; |
| 46 | xmlXPathNAN /= 0; |
| 47 | |
| 48 | xmlXPathPINF = 1; |
| 49 | xmlXPathPINF /= 0; |
| 50 | |
| 51 | xmlXPathMINF = -1; |
| 52 | xmlXPathMINF /= 0; |
| 53 | |
| 54 | initialized = 1; |
| 55 | } |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 56 | |
| 57 | /* #define DEBUG */ |
| 58 | /* #define DEBUG_STEP */ |
| 59 | /* #define DEBUG_EXPR */ |
| 60 | |
| 61 | FILE *xmlXPathDebug = NULL; |
| 62 | |
| 63 | #define TODO \ |
| 64 | fprintf(xmlXPathDebug, "Unimplemented block at %s:%d\n", \ |
| 65 | __FILE__, __LINE__); |
| 66 | |
| 67 | #define STRANGE \ |
| 68 | fprintf(xmlXPathDebug, "Internal error at %s:%d\n", \ |
| 69 | __FILE__, __LINE__); |
| 70 | |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 71 | double xmlXPathStringEvalNumber(const CHAR *str); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 72 | |
| 73 | /************************************************************************ |
| 74 | * * |
| 75 | * Parser stacks related functions and macros * |
| 76 | * * |
| 77 | ************************************************************************/ |
| 78 | |
| 79 | /* |
| 80 | * Generic function for accessing stacks in the Parser Context |
| 81 | */ |
| 82 | |
| 83 | #define PUSH_AND_POP(type, name) \ |
| 84 | extern int name##Push(xmlXPathParserContextPtr ctxt, type value) { \ |
| 85 | if (ctxt->name##Nr >= ctxt->name##Max) { \ |
| 86 | ctxt->name##Max *= 2; \ |
| 87 | ctxt->name##Tab = (void *) realloc(ctxt->name##Tab, \ |
| 88 | ctxt->name##Max * sizeof(ctxt->name##Tab[0])); \ |
| 89 | if (ctxt->name##Tab == NULL) { \ |
| 90 | fprintf(xmlXPathDebug, "realloc failed !\n"); \ |
| 91 | exit(1); \ |
| 92 | } \ |
| 93 | } \ |
| 94 | ctxt->name##Tab[ctxt->name##Nr] = value; \ |
| 95 | ctxt->name = value; \ |
| 96 | return(ctxt->name##Nr++); \ |
| 97 | } \ |
| 98 | extern type name##Pop(xmlXPathParserContextPtr ctxt) { \ |
| 99 | type ret; \ |
| 100 | if (ctxt->name##Nr <= 0) return(0); \ |
| 101 | ctxt->name##Nr--; \ |
| 102 | if (ctxt->name##Nr > 0) \ |
| 103 | ctxt->name = ctxt->name##Tab[ctxt->name##Nr - 1]; \ |
| 104 | else \ |
| 105 | ctxt->name = NULL; \ |
| 106 | ret = ctxt->name##Tab[ctxt->name##Nr]; \ |
| 107 | ctxt->name##Tab[ctxt->name##Nr] = 0; \ |
| 108 | return(ret); \ |
| 109 | } \ |
| 110 | |
| 111 | PUSH_AND_POP(xmlXPathObjectPtr, value) |
| 112 | |
| 113 | /* |
| 114 | * Macros for accessing the content. Those should be used only by the parser, |
| 115 | * and not exported. |
| 116 | * |
| 117 | * Dirty macros, i.e. one need to make assumption on the context to use them |
| 118 | * |
| 119 | * CUR_PTR return the current pointer to the CHAR to be parsed. |
| 120 | * CUR returns the current CHAR value, i.e. a 8 bit value if compiled |
| 121 | * in ISO-Latin or UTF-8, and the current 16 bit value if compiled |
| 122 | * in UNICODE mode. This should be used internally by the parser |
| 123 | * only to compare to ASCII values otherwise it would break when |
| 124 | * running with UTF-8 encoding. |
| 125 | * NXT(n) returns the n'th next CHAR. Same as CUR is should be used only |
| 126 | * to compare on ASCII based substring. |
| 127 | * SKIP(n) Skip n CHAR, and must also be used only to skip ASCII defined |
| 128 | * strings within the parser. |
| 129 | * CURRENT Returns the current char value, with the full decoding of |
| 130 | * UTF-8 if we are using this mode. It returns an int. |
| 131 | * NEXT Skip to the next character, this does the proper decoding |
| 132 | * in UTF-8 mode. It also pop-up unfinished entities on the fly. |
| 133 | * It returns the pointer to the current CHAR. |
| 134 | */ |
| 135 | |
| 136 | #define CUR (*ctxt->cur) |
| 137 | #define SKIP(val) ctxt->cur += (val) |
| 138 | #define NXT(val) ctxt->cur[(val)] |
| 139 | #define CUR_PTR ctxt->cur |
| 140 | |
| 141 | #define SKIP_BLANKS \ |
| 142 | while (IS_BLANK(*(ctxt->cur))) NEXT |
| 143 | |
| 144 | #ifndef USE_UTF_8 |
| 145 | #define CURRENT (*ctxt->cur) |
| 146 | #define NEXT ((*ctxt->cur) ? ctxt->cur++: ctxt->cur) |
| 147 | #else |
| 148 | #endif |
| 149 | |
| 150 | /************************************************************************ |
| 151 | * * |
| 152 | * Error handling routines * |
| 153 | * * |
| 154 | ************************************************************************/ |
| 155 | |
| 156 | #define XPATH_EXPRESSION_OK 0 |
| 157 | #define XPATH_NUMBER_ERROR 1 |
| 158 | #define XPATH_UNFINISHED_LITERAL_ERROR 2 |
| 159 | #define XPATH_START_LITERAL_ERROR 3 |
| 160 | #define XPATH_VARIABLE_REF_ERROR 4 |
| 161 | #define XPATH_UNDEF_VARIABLE_ERROR 5 |
| 162 | #define XPATH_INVALID_PREDICATE_ERROR 6 |
| 163 | #define XPATH_EXPR_ERROR 7 |
| 164 | #define XPATH_UNCLOSED_ERROR 8 |
| 165 | #define XPATH_UNKNOWN_FUNC_ERROR 9 |
| 166 | #define XPATH_INVALID_OPERAND 10 |
| 167 | #define XPATH_INVALID_TYPE 11 |
| 168 | #define XPATH_INVALID_ARITY 12 |
| 169 | |
| 170 | const char *xmlXPathErrorMessages[] = { |
| 171 | "Ok", |
| 172 | "Number encoding", |
| 173 | "Unfinished litteral", |
| 174 | "Start of litteral", |
| 175 | "Expected $ for variable reference", |
| 176 | "Undefined variable", |
| 177 | "Invalid predicate", |
| 178 | "Invalid expression", |
| 179 | "Missing closing curly brace", |
| 180 | "Unregistered function", |
| 181 | "Invalid operand", |
| 182 | "Invalid type", |
| 183 | "Invalid number of arguments", |
| 184 | }; |
| 185 | |
| 186 | /** |
| 187 | * xmlXPathError: |
| 188 | * @ctxt: the XPath Parser context |
| 189 | * @file: the file name |
| 190 | * @line: the line number |
| 191 | * @no: the error number |
| 192 | * |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 193 | * Create a new xmlNodeSetPtr of type double and of value @val |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 194 | * |
| 195 | * Returns the newly created object. |
| 196 | */ |
| 197 | void |
| 198 | xmlXPatherror(xmlXPathParserContextPtr ctxt, const char *file, |
| 199 | int line, int no) { |
| 200 | int n; |
| 201 | const char *cur; |
| 202 | const char *base; |
| 203 | |
| 204 | fprintf(xmlXPathDebug, "Error %s:%d: %s\n", file, line, |
| 205 | xmlXPathErrorMessages[no]); |
| 206 | |
| 207 | cur = ctxt->cur; |
| 208 | base = ctxt->base; |
| 209 | while ((cur > base) && ((*cur == '\n') || (*cur == '\r'))) { |
| 210 | cur--; |
| 211 | } |
| 212 | n = 0; |
| 213 | while ((n++ < 80) && (cur > base) && (*cur != '\n') && (*cur != '\r')) |
| 214 | cur--; |
| 215 | if ((*cur == '\n') || (*cur == '\r')) cur++; |
| 216 | base = cur; |
| 217 | n = 0; |
| 218 | while ((*cur != 0) && (*cur != '\n') && (*cur != '\r') && (n < 79)) { |
| 219 | fprintf(xmlXPathDebug, "%c", (unsigned char) *cur++); |
| 220 | n++; |
| 221 | } |
| 222 | fprintf(xmlXPathDebug, "\n"); |
| 223 | cur = ctxt->cur; |
| 224 | while ((*cur == '\n') || (*cur == '\r')) |
| 225 | cur--; |
| 226 | n = 0; |
| 227 | while ((cur != base) && (n++ < 80)) { |
| 228 | fprintf(xmlXPathDebug, " "); |
| 229 | base++; |
| 230 | } |
| 231 | fprintf(xmlXPathDebug,"^\n"); |
| 232 | } |
| 233 | |
| 234 | #define CHECK_ERROR \ |
| 235 | if (ctxt->error != XPATH_EXPRESSION_OK) return |
| 236 | |
| 237 | #define ERROR(X) \ |
| 238 | { xmlXPatherror(ctxt, __FILE__, __LINE__, X); \ |
| 239 | ctxt->error = (X); return; } |
| 240 | |
| 241 | #define CHECK_TYPE(typeval) \ |
| 242 | if ((ctxt->value == NULL) || (ctxt->value->type != typeval)) \ |
| 243 | ERROR(XPATH_INVALID_TYPE) \ |
| 244 | |
| 245 | |
| 246 | /************************************************************************ |
| 247 | * * |
| 248 | * Routines to handle NodeSets * |
| 249 | * * |
| 250 | ************************************************************************/ |
| 251 | |
| 252 | #define XML_NODESET_DEFAULT 10 |
| 253 | /** |
| 254 | * xmlXPathNodeSetCreate: |
| 255 | * @val: an initial xmlNodePtr, or NULL |
| 256 | * |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 257 | * Create a new xmlNodeSetPtr of type double and of value @val |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 258 | * |
| 259 | * Returns the newly created object. |
| 260 | */ |
| 261 | xmlNodeSetPtr |
| 262 | xmlXPathNodeSetCreate(xmlNodePtr val) { |
| 263 | xmlNodeSetPtr ret; |
| 264 | |
| 265 | ret = (xmlNodeSetPtr) malloc(sizeof(xmlNodeSet)); |
| 266 | if (ret == NULL) { |
| 267 | fprintf(xmlXPathDebug, "xmlXPathNewNodeSet: out of memory\n"); |
| 268 | return(NULL); |
| 269 | } |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 270 | memset(ret, 0 , (size_t) sizeof(xmlNodeSet)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 271 | if (val != NULL) { |
| 272 | ret->nodeTab = (xmlNodePtr *) malloc(XML_NODESET_DEFAULT * |
| 273 | sizeof(xmlNodePtr)); |
| 274 | if (ret->nodeTab == NULL) { |
| 275 | fprintf(xmlXPathDebug, "xmlXPathNewNodeSet: out of memory\n"); |
| 276 | return(NULL); |
| 277 | } |
| 278 | memset(ret->nodeTab, 0 , |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 279 | XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 280 | ret->nodeMax = XML_NODESET_DEFAULT; |
| 281 | ret->nodeTab[ret->nodeNr++] = val; |
| 282 | } |
| 283 | return(ret); |
| 284 | } |
| 285 | |
| 286 | /** |
| 287 | * xmlXPathNodeSetAdd: |
| 288 | * @cur: the initial node set |
| 289 | * @val: a new xmlNodePtr |
| 290 | * |
| 291 | * add a new xmlNodePtr ot an existing NodeSet |
| 292 | */ |
| 293 | void |
| 294 | xmlXPathNodeSetAdd(xmlNodeSetPtr cur, xmlNodePtr val) { |
| 295 | int i; |
| 296 | |
| 297 | if (val == NULL) return; |
| 298 | |
| 299 | /* |
| 300 | * check against doublons |
| 301 | */ |
| 302 | for (i = 0;i < cur->nodeNr;i++) |
| 303 | if (cur->nodeTab[i] == val) return; |
| 304 | |
| 305 | /* |
| 306 | * grow the nodeTab if needed |
| 307 | */ |
| 308 | if (cur->nodeMax == 0) { |
| 309 | cur->nodeTab = (xmlNodePtr *) malloc(XML_NODESET_DEFAULT * |
| 310 | sizeof(xmlNodePtr)); |
| 311 | if (cur->nodeTab == NULL) { |
| 312 | fprintf(xmlXPathDebug, "xmlXPathNodeSetAdd: out of memory\n"); |
| 313 | return; |
| 314 | } |
| 315 | memset(cur->nodeTab, 0 , |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 316 | XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 317 | cur->nodeMax = XML_NODESET_DEFAULT; |
| 318 | } else if (cur->nodeNr == cur->nodeMax) { |
| 319 | xmlNodePtr *temp; |
| 320 | |
| 321 | cur->nodeMax *= 2; |
| 322 | temp = (xmlNodePtr *) realloc(cur->nodeTab, cur->nodeMax * |
| 323 | sizeof(xmlNodePtr)); |
| 324 | if (temp == NULL) { |
| 325 | fprintf(xmlXPathDebug, "xmlXPathNodeSetAdd: out of memory\n"); |
| 326 | return; |
| 327 | } |
| 328 | } |
| 329 | cur->nodeTab[cur->nodeNr++] = val; |
| 330 | } |
| 331 | |
| 332 | /** |
| 333 | * xmlXPathNodeSetMerge: |
| 334 | * @val1: the first NodeSet |
| 335 | * @val2: the second NodeSet |
| 336 | * |
| 337 | * Merges two nodesets, all nodes from @val2 are added to @val1 |
| 338 | * |
| 339 | * Returns val1 once extended or NULL in case of error. |
| 340 | */ |
| 341 | xmlNodeSetPtr |
| 342 | xmlXPathNodeSetMerge(xmlNodeSetPtr val1, xmlNodeSetPtr val2) { |
| 343 | int i; |
| 344 | |
| 345 | if (val1 == NULL) return(NULL); |
| 346 | if (val2 == NULL) return(val1); |
| 347 | |
| 348 | /* |
| 349 | * !!!!! this can be optimized a lot, knowing that both |
| 350 | * val1 and val2 already have unicity of their values. |
| 351 | */ |
| 352 | |
| 353 | for (i = 0;i < val2->nodeNr;i++) |
| 354 | xmlXPathNodeSetAdd(val1, val2->nodeTab[i]); |
| 355 | |
| 356 | return(val1); |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * xmlXPathNodeSetDel: |
| 361 | * @cur: the initial node set |
| 362 | * @val: an xmlNodePtr |
| 363 | * |
| 364 | * Removes an xmlNodePtr from an existing NodeSet |
| 365 | */ |
| 366 | void |
| 367 | xmlXPathNodeSetDel(xmlNodeSetPtr cur, xmlNodePtr val) { |
| 368 | int i; |
| 369 | |
| 370 | if (cur == NULL) return; |
| 371 | if (val == NULL) return; |
| 372 | |
| 373 | /* |
| 374 | * check against doublons |
| 375 | */ |
| 376 | for (i = 0;i < cur->nodeNr;i++) |
| 377 | if (cur->nodeTab[i] == val) break; |
| 378 | |
| 379 | if (i >= cur->nodeNr) { |
| 380 | #ifdef DEBUG |
| 381 | fprintf(xmlXPathDebug, |
| 382 | "xmlXPathNodeSetDel: Node %s wasn't found in NodeList\n", |
| 383 | val->name); |
| 384 | #endif |
| 385 | return; |
| 386 | } |
| 387 | cur->nodeNr--; |
| 388 | for (;i < cur->nodeNr;i++) |
| 389 | cur->nodeTab[i] = cur->nodeTab[i + 1]; |
| 390 | cur->nodeTab[cur->nodeNr] = NULL; |
| 391 | } |
| 392 | |
| 393 | /** |
| 394 | * xmlXPathNodeSetRemove: |
| 395 | * @cur: the initial node set |
| 396 | * @val: the index to remove |
| 397 | * |
| 398 | * Removes an entry from an existing NodeSet list. |
| 399 | */ |
| 400 | void |
| 401 | xmlXPathNodeSetRemove(xmlNodeSetPtr cur, int val) { |
| 402 | if (cur == NULL) return; |
| 403 | if (val >= cur->nodeNr) return; |
| 404 | cur->nodeNr--; |
| 405 | for (;val < cur->nodeNr;val++) |
| 406 | cur->nodeTab[val] = cur->nodeTab[val + 1]; |
| 407 | cur->nodeTab[cur->nodeNr] = NULL; |
| 408 | } |
| 409 | |
| 410 | /** |
| 411 | * xmlXPathFreeNodeSet: |
| 412 | * @obj: the xmlNodeSetPtr to free |
| 413 | * |
| 414 | * Free the NodeSet compound (not the actual nodes !). |
| 415 | */ |
| 416 | void |
| 417 | xmlXPathFreeNodeSet(xmlNodeSetPtr obj) { |
| 418 | if (obj == NULL) return; |
| 419 | if (obj->nodeTab != NULL) { |
| 420 | #ifdef DEBUG |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 421 | memset(obj->nodeTab, 0xB , (size_t) sizeof(xmlNodePtr) * obj->nodeMax); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 422 | #endif |
| 423 | free(obj->nodeTab); |
| 424 | } |
| 425 | #ifdef DEBUG |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 426 | memset(obj, 0xB , (size_t) sizeof(xmlNodeSet)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 427 | #endif |
| 428 | free(obj); |
| 429 | } |
| 430 | |
| 431 | #ifdef DEBUG |
| 432 | /** |
| 433 | * xmlXPathDebugNodeSet: |
| 434 | * @output: a FILE * for the output |
| 435 | * @obj: the xmlNodeSetPtr to free |
| 436 | * |
| 437 | * Quick display of a NodeSet |
| 438 | */ |
| 439 | void |
| 440 | xmlXPathDebugNodeSet(FILE *output, xmlNodeSetPtr obj) { |
| 441 | int i; |
| 442 | |
| 443 | if (output == NULL) output = xmlXPathDebug; |
| 444 | if (obj == NULL) { |
| 445 | fprintf(output, "NodeSet == NULL !\n"); |
| 446 | return; |
| 447 | } |
| 448 | if (obj->nodeNr == 0) { |
| 449 | fprintf(output, "NodeSet is empty\n"); |
| 450 | return; |
| 451 | } |
| 452 | if (obj->nodeTab == NULL) { |
| 453 | fprintf(output, " nodeTab == NULL !\n"); |
| 454 | return; |
| 455 | } |
| 456 | for (i = 0; i < obj->nodeNr; i++) { |
| 457 | if (obj->nodeTab[i] == NULL) { |
| 458 | fprintf(output, " NULL !\n"); |
| 459 | return; |
| 460 | } |
| 461 | if (obj->nodeTab[i]->name == NULL) |
| 462 | fprintf(output, " noname!"); |
| 463 | else fprintf(output, " %s", obj->nodeTab[i]->name); |
| 464 | } |
| 465 | fprintf(output, "\n"); |
| 466 | } |
| 467 | #endif |
| 468 | |
| 469 | /************************************************************************ |
| 470 | * * |
| 471 | * Routines to handle Variable * |
| 472 | * * |
| 473 | * UNIMPLEMENTED CURRENTLY * |
| 474 | * * |
| 475 | ************************************************************************/ |
| 476 | |
| 477 | /** |
| 478 | * xmlXPathVariablelookup: |
| 479 | * @ctxt: the XPath Parser context |
| 480 | * @prefix: the variable name namespace if any |
| 481 | * @name: the variable name |
| 482 | * |
| 483 | * Search in the Variable array of the context for the given |
| 484 | * variable value. |
| 485 | * |
| 486 | * UNIMPLEMENTED: always return NULL. |
| 487 | * |
| 488 | * Returns the value or NULL if not found |
| 489 | */ |
| 490 | xmlXPathObjectPtr |
| 491 | xmlXPathVariablelookup(xmlXPathParserContextPtr ctxt, |
| 492 | const CHAR *prefix, const CHAR *name) { |
| 493 | return(NULL); |
| 494 | } |
| 495 | |
| 496 | /************************************************************************ |
| 497 | * * |
| 498 | * Routines to handle Values * |
| 499 | * * |
| 500 | ************************************************************************/ |
| 501 | |
| 502 | /* Allocations are terrible, one need to optimize all this !!! */ |
| 503 | |
| 504 | /** |
| 505 | * xmlXPathNewFloat: |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 506 | * @val: the double value |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 507 | * |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 508 | * Create a new xmlXPathObjectPtr of type double and of value @val |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 509 | * |
| 510 | * Returns the newly created object. |
| 511 | */ |
| 512 | xmlXPathObjectPtr |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 513 | xmlXPathNewFloat(double val) { |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 514 | xmlXPathObjectPtr ret; |
| 515 | |
| 516 | ret = (xmlXPathObjectPtr) malloc(sizeof(xmlXPathObject)); |
| 517 | if (ret == NULL) { |
| 518 | fprintf(xmlXPathDebug, "xmlXPathNewFloat: out of memory\n"); |
| 519 | return(NULL); |
| 520 | } |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 521 | memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 522 | ret->type = XPATH_NUMBER; |
| 523 | ret->floatval = val; |
| 524 | return(ret); |
| 525 | } |
| 526 | |
| 527 | /** |
| 528 | * xmlXPathNewBoolean: |
| 529 | * @val: the boolean value |
| 530 | * |
| 531 | * Create a new xmlXPathObjectPtr of type boolean and of value @val |
| 532 | * |
| 533 | * Returns the newly created object. |
| 534 | */ |
| 535 | xmlXPathObjectPtr |
| 536 | xmlXPathNewBoolean(int val) { |
| 537 | xmlXPathObjectPtr ret; |
| 538 | |
| 539 | ret = (xmlXPathObjectPtr) malloc(sizeof(xmlXPathObject)); |
| 540 | if (ret == NULL) { |
| 541 | fprintf(xmlXPathDebug, "xmlXPathNewFloat: out of memory\n"); |
| 542 | return(NULL); |
| 543 | } |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 544 | memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 545 | ret->type = XPATH_BOOLEAN; |
| 546 | ret->boolval = (val != 0); |
| 547 | return(ret); |
| 548 | } |
| 549 | |
| 550 | /** |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 551 | * xmlXPathNewBoolean: |
| 552 | * @val: the CHAR * value |
| 553 | * |
| 554 | * Create a new xmlXPathObjectPtr of type string and of value @val |
| 555 | * |
| 556 | * Returns the newly created object. |
| 557 | */ |
| 558 | xmlXPathObjectPtr |
| 559 | xmlXPathNewString(const CHAR *val) { |
| 560 | xmlXPathObjectPtr ret; |
| 561 | |
| 562 | ret = (xmlXPathObjectPtr) malloc(sizeof(xmlXPathObject)); |
| 563 | if (ret == NULL) { |
| 564 | fprintf(xmlXPathDebug, "xmlXPathNewFloat: out of memory\n"); |
| 565 | return(NULL); |
| 566 | } |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 567 | memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 568 | ret->type = XPATH_STRING; |
| 569 | ret->stringval = xmlStrdup(val); |
| 570 | return(ret); |
| 571 | } |
| 572 | |
| 573 | /** |
| 574 | * xmlXPathNewNodeSet: |
| 575 | * @val: the NodePtr value |
| 576 | * |
| 577 | * Create a new xmlXPathObjectPtr of type NodeSet and initialize |
| 578 | * it with the single Node @val |
| 579 | * |
| 580 | * Returns the newly created object. |
| 581 | */ |
| 582 | xmlXPathObjectPtr |
| 583 | xmlXPathNewNodeSet(xmlNodePtr val) { |
| 584 | xmlXPathObjectPtr ret; |
| 585 | |
| 586 | ret = (xmlXPathObjectPtr) malloc(sizeof(xmlXPathObject)); |
| 587 | if (ret == NULL) { |
| 588 | fprintf(xmlXPathDebug, "xmlXPathNewFloat: out of memory\n"); |
| 589 | return(NULL); |
| 590 | } |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 591 | memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 592 | ret->type = XPATH_NODESET; |
| 593 | ret->nodesetval = xmlXPathNodeSetCreate(val); |
| 594 | return(ret); |
| 595 | } |
| 596 | |
| 597 | /** |
| 598 | * xmlXPathNewNodeSetList: |
| 599 | * @val: an existing NodeSet |
| 600 | * |
| 601 | * Create a new xmlXPathObjectPtr of type NodeSet and initialize |
| 602 | * it with the Nodeset @val |
| 603 | * |
| 604 | * Returns the newly created object. |
| 605 | */ |
| 606 | xmlXPathObjectPtr |
| 607 | xmlXPathNewNodeSetList(xmlNodeSetPtr val) { |
| 608 | xmlXPathObjectPtr ret; |
| 609 | |
| 610 | ret = (xmlXPathObjectPtr) malloc(sizeof(xmlXPathObject)); |
| 611 | if (ret == NULL) { |
| 612 | fprintf(xmlXPathDebug, "xmlXPathNewFloat: out of memory\n"); |
| 613 | return(NULL); |
| 614 | } |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 615 | memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 616 | ret->type = XPATH_NODESET; |
| 617 | ret->nodesetval = val; |
| 618 | return(ret); |
| 619 | } |
| 620 | |
| 621 | /** |
| 622 | * xmlXPathFreeObject: |
| 623 | * @obj: the object to free |
| 624 | * |
| 625 | * Free up an xmlXPathObjectPtr object. |
| 626 | */ |
| 627 | void |
| 628 | xmlXPathFreeObject(xmlXPathObjectPtr obj) { |
| 629 | if (obj == NULL) return; |
| 630 | if (obj->nodesetval != NULL) |
| 631 | xmlXPathFreeNodeSet(obj->nodesetval); |
| 632 | if (obj->stringval != NULL) |
| 633 | free(obj->stringval); |
| 634 | #ifdef DEBUG |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 635 | memset(obj, 0xB , (size_t) sizeof(xmlXPathObject)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 636 | #endif |
| 637 | free(obj); |
| 638 | } |
| 639 | |
| 640 | /************************************************************************ |
| 641 | * * |
| 642 | * Routines to handle XPath contexts * |
| 643 | * * |
| 644 | ************************************************************************/ |
| 645 | |
| 646 | /** |
| 647 | * xmlXPathNewContext: |
| 648 | * @doc: the XML document |
| 649 | * @variables: the variable list |
| 650 | * @functions: the function list |
| 651 | * @namespaces: the namespace list |
| 652 | * |
| 653 | * Create a new xmlXPathContext |
| 654 | * |
| 655 | * Returns the xmlXPathContext just allocated. |
| 656 | */ |
| 657 | xmlXPathContextPtr |
| 658 | xmlXPathNewContext(xmlDocPtr doc, void *variables, void *functions, |
| 659 | void *namespaces) { |
| 660 | xmlXPathContextPtr ret; |
| 661 | |
| 662 | ret = (xmlXPathContextPtr) malloc(sizeof(xmlXPathContext)); |
| 663 | if (ret == NULL) { |
| 664 | fprintf(xmlXPathDebug, "xmlXPathNewContext: out of memory\n"); |
| 665 | return(NULL); |
| 666 | } |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 667 | memset(ret, 0 , (size_t) sizeof(xmlXPathContext)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 668 | ret->doc = doc; |
| 669 | ret->variables = variables; |
| 670 | ret->functions = functions; |
| 671 | ret->namespaces = namespaces; |
| 672 | return(ret); |
| 673 | } |
| 674 | |
| 675 | /** |
| 676 | * xmlXPathFreeContext: |
| 677 | * @ctxt: the context to free |
| 678 | * |
| 679 | * Free up an xmlXPathContext |
| 680 | */ |
| 681 | void |
| 682 | xmlXPathFreeContext(xmlXPathContextPtr ctxt) { |
| 683 | #ifdef DEBUG |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 684 | memset(ctxt, 0xB , (size_t) sizeof(xmlXPathContext)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 685 | #endif |
| 686 | free(ctxt); |
| 687 | } |
| 688 | |
| 689 | /************************************************************************ |
| 690 | * * |
| 691 | * Routines to handle XPath parser contexts * |
| 692 | * * |
| 693 | ************************************************************************/ |
| 694 | |
| 695 | #define CHECK_CTXT \ |
| 696 | if (ctxt == NULL) { \ |
| 697 | fprintf(xmlXPathDebug, "%s:%d Internal error: ctxt == NULL\n", \ |
| 698 | __FILE__, __LINE__); \ |
| 699 | } \ |
| 700 | |
| 701 | |
| 702 | #define CHECK_CONTEXT \ |
| 703 | if (ctxt == NULL) { \ |
| 704 | fprintf(xmlXPathDebug, "%s:%d Internal error: no context\n", \ |
| 705 | __FILE__, __LINE__); \ |
| 706 | } \ |
| 707 | if (ctxt->doc == NULL) { \ |
| 708 | fprintf(xmlXPathDebug, "%s:%d Internal error: no document\n", \ |
| 709 | __FILE__, __LINE__); \ |
| 710 | } \ |
| 711 | if (ctxt->doc->root == NULL) { \ |
| 712 | fprintf(xmlXPathDebug, \ |
| 713 | "%s:%d Internal error: document without root\n", \ |
| 714 | __FILE__, __LINE__); \ |
| 715 | } \ |
| 716 | |
| 717 | |
| 718 | /** |
| 719 | * xmlXPathNewParserContext: |
| 720 | * @str: the XPath expression |
| 721 | * @ctxt: the XPath context |
| 722 | * |
| 723 | * Create a new xmlXPathParserContext |
| 724 | * |
| 725 | * Returns the xmlXPathParserContext just allocated. |
| 726 | */ |
| 727 | xmlXPathParserContextPtr |
| 728 | xmlXPathNewParserContext(const CHAR *str, xmlXPathContextPtr ctxt) { |
| 729 | xmlXPathParserContextPtr ret; |
| 730 | |
| 731 | ret = (xmlXPathParserContextPtr) malloc(sizeof(xmlXPathParserContext)); |
| 732 | if (ret == NULL) { |
| 733 | fprintf(xmlXPathDebug, "xmlXPathNewParserContext: out of memory\n"); |
| 734 | return(NULL); |
| 735 | } |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 736 | memset(ret, 0 , (size_t) sizeof(xmlXPathParserContext)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 737 | ret->cur = ret->base = str; |
| 738 | ret->context = ctxt; |
| 739 | |
| 740 | /* Allocate the value stack */ |
| 741 | ret->valueTab = (xmlXPathObjectPtr *) |
| 742 | malloc(10 * sizeof(xmlXPathObjectPtr)); |
| 743 | ret->valueNr = 0; |
| 744 | ret->valueMax = 10; |
| 745 | ret->value = NULL; |
| 746 | return(ret); |
| 747 | } |
| 748 | |
| 749 | /** |
| 750 | * xmlXPathFreeParserContext: |
| 751 | * @ctxt: the context to free |
| 752 | * |
| 753 | * Free up an xmlXPathParserContext |
| 754 | */ |
| 755 | void |
| 756 | xmlXPathFreeParserContext(xmlXPathParserContextPtr ctxt) { |
| 757 | if (ctxt->valueTab != NULL) { |
| 758 | #ifdef DEBUG |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 759 | memset(ctxt->valueTab, 0xB , 10 * (size_t) sizeof(xmlXPathObjectPtr)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 760 | #endif |
| 761 | free(ctxt->valueTab); |
| 762 | } |
| 763 | #ifdef DEBUG |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 764 | memset(ctxt, 0xB , (size_t) sizeof(xmlXPathParserContext)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 765 | #endif |
| 766 | free(ctxt); |
| 767 | } |
| 768 | |
| 769 | /************************************************************************ |
| 770 | * * |
| 771 | * The implicit core function library * |
| 772 | * * |
| 773 | ************************************************************************/ |
| 774 | |
| 775 | /* |
| 776 | * TODO: check the semantic for all these operations in case of operands |
| 777 | * with different types, Cast function probably need to be provided |
| 778 | * to simplify the coding. |
| 779 | */ |
| 780 | |
| 781 | /* |
| 782 | * Auto-pop and cast to a number |
| 783 | */ |
| 784 | void xmlXPathNumberFunction(xmlXPathParserContextPtr ctxt, int nargs); |
| 785 | |
| 786 | #define CHECK_ARITY(x) \ |
| 787 | if (nargs != (x)) { \ |
| 788 | ERROR(XPATH_INVALID_ARITY); \ |
| 789 | } \ |
| 790 | |
| 791 | |
| 792 | #define POP_FLOAT \ |
| 793 | arg = valuePop(ctxt); \ |
| 794 | if (arg == NULL) { \ |
| 795 | ERROR(XPATH_INVALID_OPERAND); \ |
| 796 | } \ |
| 797 | if (arg->type != XPATH_NUMBER) { \ |
| 798 | valuePush(ctxt, arg); \ |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 799 | xmlXPathNumberFunction(ctxt, 1); \ |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 800 | arg = valuePop(ctxt); \ |
| 801 | } |
| 802 | |
| 803 | /** |
| 804 | * xmlXPathEqualValues: |
| 805 | * @arg1: first XPath object argument |
| 806 | * @arg2: second XPath object argument |
| 807 | * |
| 808 | * Implement the equal operation on XPath objects content: @arg1 == @arg2 |
| 809 | * |
| 810 | * Returns 0 or 1 depending on the results of the test. |
| 811 | * TODO: rewrite using the stack for evaluation |
| 812 | */ |
| 813 | int |
| 814 | xmlXPathEqualValues(xmlXPathObjectPtr arg1, xmlXPathObjectPtr arg2) { |
| 815 | if (arg1 == arg2) { |
| 816 | #ifdef DEBUG_EXPR |
| 817 | fprintf(xmlXPathDebug, "Equal: by pointer\n"); |
| 818 | #endif |
| 819 | return(1); |
| 820 | } |
| 821 | if ((arg1 == NULL) || (arg2 == NULL)) { |
| 822 | #ifdef DEBUG_EXPR |
| 823 | fprintf(xmlXPathDebug, "Equal: arg NULL\n"); |
| 824 | #endif |
| 825 | return(0); |
| 826 | } |
| 827 | if (arg1->type != arg2->type) { |
| 828 | /* TODO : see 4.3 Boolean section !!!!!!!!!!! */ |
| 829 | #ifdef DEBUG_EXPR |
| 830 | fprintf(xmlXPathDebug, "Equal: distinct types\n"); |
| 831 | #endif |
| 832 | return(0); |
| 833 | } |
| 834 | switch (arg1->type) { |
| 835 | case XPATH_UNDEFINED: |
| 836 | #ifdef DEBUG_EXPR |
| 837 | fprintf(xmlXPathDebug, "Equal: undefined\n"); |
| 838 | #endif |
| 839 | return(0); |
| 840 | case XPATH_NODESET: |
| 841 | TODO /* compare nodesets */ |
| 842 | break; |
| 843 | case XPATH_BOOLEAN: |
| 844 | #ifdef DEBUG_EXPR |
| 845 | fprintf(xmlXPathDebug, "Equal: %d boolean %d \n", |
| 846 | arg1->boolval, arg2->boolval); |
| 847 | #endif |
| 848 | return(arg1->boolval == arg2->boolval); |
| 849 | case XPATH_NUMBER: |
| 850 | #ifdef DEBUG_EXPR |
| 851 | fprintf(xmlXPathDebug, "Equal: %f number %f \n", |
| 852 | arg1->floatval, arg2->floatval); |
| 853 | #endif |
| 854 | return(arg1->floatval == arg2->floatval); |
| 855 | case XPATH_STRING: |
| 856 | #ifdef DEBUG_EXPR |
| 857 | fprintf(xmlXPathDebug, "Equal: %s string %s \n", |
| 858 | arg1->stringval, arg2->stringval); |
| 859 | #endif |
| 860 | return(!xmlStrcmp(arg1->stringval, arg2->stringval)); |
| 861 | } |
| 862 | return(1); |
| 863 | } |
| 864 | |
| 865 | /** |
| 866 | * xmlXPathCompareValues: |
| 867 | * @inf: less than (1) or greater than (2) |
| 868 | * @strict: is the comparison strict |
| 869 | * @arg1: first XPath object argument |
| 870 | * @arg2: second XPath object argument |
| 871 | * |
| 872 | * Implement the compare operation on XPath objects: |
| 873 | * @arg1 < @arg2 (1, 1, ... |
| 874 | * @arg1 <= @arg2 (1, 0, ... |
| 875 | * @arg1 > @arg2 (0, 1, ... |
| 876 | * @arg1 >= @arg2 (0, 0, ... |
| 877 | * |
| 878 | * Returns 0 or 1 depending on the results of the test. |
| 879 | */ |
| 880 | int |
| 881 | xmlXPathCompareValues(int inf, int strict, xmlXPathObjectPtr arg1, |
| 882 | xmlXPathObjectPtr arg2) { |
| 883 | TODO /* compare */ |
| 884 | return(0); |
| 885 | } |
| 886 | |
| 887 | /** |
| 888 | * xmlXPathValueFlipSign: |
| 889 | * @ctxt: the XPath Parser context |
| 890 | * |
| 891 | * Implement the unary - operation on an XPath object |
| 892 | * The numeric operators convert their operands to numbers as if |
| 893 | * by calling the number function. |
| 894 | */ |
| 895 | void |
| 896 | xmlXPathValueFlipSign(xmlXPathParserContextPtr ctxt) { |
| 897 | xmlXPathObjectPtr arg; |
| 898 | |
| 899 | POP_FLOAT |
| 900 | arg->floatval = -arg->floatval; |
| 901 | valuePush(ctxt, arg); |
| 902 | } |
| 903 | |
| 904 | /** |
| 905 | * xmlXPathAddValues: |
| 906 | * @ctxt: the XPath Parser context |
| 907 | * |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 908 | * Implement the add operation on XPath objects: |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 909 | * The numeric operators convert their operands to numbers as if |
| 910 | * by calling the number function. |
| 911 | */ |
| 912 | void |
| 913 | xmlXPathAddValues(xmlXPathParserContextPtr ctxt) { |
| 914 | xmlXPathObjectPtr arg; |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 915 | double val; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 916 | |
| 917 | POP_FLOAT |
| 918 | val = arg->floatval; |
| 919 | xmlXPathFreeObject(arg); |
| 920 | |
| 921 | POP_FLOAT |
| 922 | arg->floatval += val; |
| 923 | valuePush(ctxt, arg); |
| 924 | } |
| 925 | |
| 926 | /** |
| 927 | * xmlXPathSubValues: |
| 928 | * @ctxt: the XPath Parser context |
| 929 | * |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 930 | * Implement the substraction operation on XPath objects: |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 931 | * The numeric operators convert their operands to numbers as if |
| 932 | * by calling the number function. |
| 933 | */ |
| 934 | void |
| 935 | xmlXPathSubValues(xmlXPathParserContextPtr ctxt) { |
| 936 | xmlXPathObjectPtr arg; |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 937 | double val; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 938 | |
| 939 | POP_FLOAT |
| 940 | val = arg->floatval; |
| 941 | xmlXPathFreeObject(arg); |
| 942 | |
| 943 | POP_FLOAT |
| 944 | arg->floatval -= val; |
| 945 | valuePush(ctxt, arg); |
| 946 | } |
| 947 | |
| 948 | /** |
| 949 | * xmlXPathMultValues: |
| 950 | * @ctxt: the XPath Parser context |
| 951 | * |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 952 | * Implement the multiply operation on XPath objects: |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 953 | * The numeric operators convert their operands to numbers as if |
| 954 | * by calling the number function. |
| 955 | */ |
| 956 | void |
| 957 | xmlXPathMultValues(xmlXPathParserContextPtr ctxt) { |
| 958 | xmlXPathObjectPtr arg; |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 959 | double val; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 960 | |
| 961 | POP_FLOAT |
| 962 | val = arg->floatval; |
| 963 | xmlXPathFreeObject(arg); |
| 964 | |
| 965 | POP_FLOAT |
| 966 | arg->floatval *= val; |
| 967 | valuePush(ctxt, arg); |
| 968 | } |
| 969 | |
| 970 | /** |
| 971 | * xmlXPathDivValues: |
| 972 | * @ctxt: the XPath Parser context |
| 973 | * |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 974 | * Implement the div operation on XPath objects: |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 975 | * The numeric operators convert their operands to numbers as if |
| 976 | * by calling the number function. |
| 977 | */ |
| 978 | void |
| 979 | xmlXPathDivValues(xmlXPathParserContextPtr ctxt) { |
| 980 | xmlXPathObjectPtr arg; |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 981 | double val; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 982 | |
| 983 | POP_FLOAT |
| 984 | val = arg->floatval; |
| 985 | xmlXPathFreeObject(arg); |
| 986 | |
| 987 | POP_FLOAT |
| 988 | arg->floatval /= val; |
| 989 | valuePush(ctxt, arg); |
| 990 | } |
| 991 | |
| 992 | /** |
| 993 | * xmlXPathModValues: |
| 994 | * @ctxt: the XPath Parser context |
| 995 | * |
| 996 | * Implement the div operation on XPath objects: @arg1 / @arg2 |
| 997 | * The numeric operators convert their operands to numbers as if |
| 998 | * by calling the number function. |
| 999 | */ |
| 1000 | void |
| 1001 | xmlXPathModValues(xmlXPathParserContextPtr ctxt) { |
| 1002 | xmlXPathObjectPtr arg; |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 1003 | double val; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 1004 | |
| 1005 | POP_FLOAT |
| 1006 | val = arg->floatval; |
| 1007 | xmlXPathFreeObject(arg); |
| 1008 | |
| 1009 | POP_FLOAT |
| 1010 | arg->floatval /= val; |
| 1011 | valuePush(ctxt, arg); |
| 1012 | } |
| 1013 | |
| 1014 | /************************************************************************ |
| 1015 | * * |
| 1016 | * The traversal functions * |
| 1017 | * * |
| 1018 | ************************************************************************/ |
| 1019 | |
| 1020 | #define AXIS_ANCESTOR 1 |
| 1021 | #define AXIS_ANCESTOR_OR_SELF 2 |
| 1022 | #define AXIS_ATTRIBUTE 3 |
| 1023 | #define AXIS_CHILD 4 |
| 1024 | #define AXIS_DESCENDANT 5 |
| 1025 | #define AXIS_DESCENDANT_OR_SELF 6 |
| 1026 | #define AXIS_FOLLOWING 7 |
| 1027 | #define AXIS_FOLLOWING_SIBLING 8 |
| 1028 | #define AXIS_NAMESPACE 9 |
| 1029 | #define AXIS_PARENT 10 |
| 1030 | #define AXIS_PRECEDING 11 |
| 1031 | #define AXIS_PRECEDING_SIBLING 12 |
| 1032 | #define AXIS_SELF 13 |
| 1033 | |
| 1034 | /* |
| 1035 | * A traversal function enumerates nodes along an axis. |
| 1036 | * Initially it must be called with NULL, and it indicates |
| 1037 | * termination on the axis by returning NULL. |
| 1038 | */ |
| 1039 | typedef xmlNodePtr (*xmlXPathTraversalFunction) |
| 1040 | (xmlXPathParserContextPtr ctxt, xmlNodePtr cur); |
| 1041 | |
| 1042 | /** |
| 1043 | * mlXPathNextSelf: |
| 1044 | * @ctxt: the XPath Parser context |
| 1045 | * @cur: the current node in the traversal |
| 1046 | * |
| 1047 | * Traversal function for the "self" direction |
| 1048 | * he self axis contains just the context node itself |
| 1049 | */ |
| 1050 | xmlNodePtr |
| 1051 | xmlXPathNextSelf(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { |
| 1052 | if (cur == NULL) |
| 1053 | return(ctxt->context->node); |
| 1054 | return(NULL); |
| 1055 | } |
| 1056 | |
| 1057 | /** |
| 1058 | * mlXPathNextChild: |
| 1059 | * @ctxt: the XPath Parser context |
| 1060 | * @cur: the current node in the traversal |
| 1061 | * |
| 1062 | * Traversal function for the "child" direction |
| 1063 | * The child axis contains the children of the context node in document order. |
| 1064 | */ |
| 1065 | xmlNodePtr |
| 1066 | xmlXPathNextChild(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { |
| 1067 | if (cur == NULL) |
| 1068 | return(ctxt->context->node->childs); |
| 1069 | return(cur->next); |
| 1070 | } |
| 1071 | |
| 1072 | /** |
| 1073 | * mlXPathNextDescendant: |
| 1074 | * @ctxt: the XPath Parser context |
| 1075 | * @cur: the current node in the traversal |
| 1076 | * |
| 1077 | * Traversal function for the "descendant" direction |
| 1078 | * the descendant axis contains the descendants of the context node in document |
| 1079 | * order; a descendant is a child or a child of a child and so on. |
| 1080 | */ |
| 1081 | xmlNodePtr |
| 1082 | xmlXPathNextDescendant(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { |
| 1083 | if (cur == NULL) |
| 1084 | return(ctxt->context->node->childs); |
| 1085 | |
| 1086 | if (cur->childs != NULL) return(cur->childs); |
| 1087 | if (cur->next != NULL) return(cur->next); |
| 1088 | |
| 1089 | do { |
| 1090 | cur = cur->parent; |
| 1091 | if (cur == NULL) return(NULL); |
| 1092 | if (cur == ctxt->context->node) return(NULL); |
| 1093 | if (cur->next != NULL) { |
| 1094 | cur = cur->next; |
| 1095 | return(cur); |
| 1096 | } |
| 1097 | } while (cur != NULL); |
| 1098 | return(cur); |
| 1099 | } |
| 1100 | |
| 1101 | /** |
| 1102 | * mlXPathNextDescendantOrSelf: |
| 1103 | * @ctxt: the XPath Parser context |
| 1104 | * @cur: the current node in the traversal |
| 1105 | * |
| 1106 | * Traversal function for the "descendant-or-self" direction |
| 1107 | * the descendant-or-self axis contains the context node and the descendants |
| 1108 | * of the context node in document order; thus the context node is the first |
| 1109 | * node on the axis, and the first child of the context node is the second node |
| 1110 | * on the axis |
| 1111 | */ |
| 1112 | xmlNodePtr |
| 1113 | xmlXPathNextDescendantOrSelf(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { |
| 1114 | if (cur == NULL) |
| 1115 | return(ctxt->context->node); |
| 1116 | |
| 1117 | if (cur->childs != NULL) return(cur->childs); |
| 1118 | if (cur->next != NULL) return(cur->next); |
| 1119 | |
| 1120 | do { |
| 1121 | cur = cur->parent; |
| 1122 | if (cur == NULL) return(NULL); |
| 1123 | if (cur == ctxt->context->node) return(NULL); |
| 1124 | if (cur->next != NULL) { |
| 1125 | cur = cur->next; |
| 1126 | return(cur); |
| 1127 | } |
| 1128 | } while (cur != NULL); |
| 1129 | return(cur); |
| 1130 | } |
| 1131 | |
| 1132 | /** |
| 1133 | * xmlXPathNextParent: |
| 1134 | * @ctxt: the XPath Parser context |
| 1135 | * @cur: the current node in the traversal |
| 1136 | * |
| 1137 | * Traversal function for the "parent" direction |
| 1138 | * The parent axis contains the parent of the context node, if there is one. |
| 1139 | */ |
| 1140 | xmlNodePtr |
| 1141 | xmlXPathNextParent(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { |
| 1142 | /* |
| 1143 | * !!!!!!!!!!!!! |
| 1144 | * the parent of an attribute or namespace node is the element |
| 1145 | * to which the attribute or namespace node is attached |
| 1146 | */ |
| 1147 | if (cur == NULL) |
| 1148 | return(ctxt->context->node->parent); |
| 1149 | return(NULL); |
| 1150 | } |
| 1151 | |
| 1152 | /** |
| 1153 | * xmlXPathNextAncestor: |
| 1154 | * @ctxt: the XPath Parser context |
| 1155 | * @cur: the current node in the traversal |
| 1156 | * |
| 1157 | * Traversal function for the "ancestor" direction |
| 1158 | * the ancestor axis contains the ancestors of the context node; the ancestors |
| 1159 | * of the context node consist of the parent of context node and the parent's |
| 1160 | * parent and so on; the nodes are ordered in reverse document order; thus the |
| 1161 | * parent is the first node on the axis, and the parent's parent is the second |
| 1162 | * node on the axis |
| 1163 | */ |
| 1164 | xmlNodePtr |
| 1165 | xmlXPathNextAncestor(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { |
| 1166 | /* |
| 1167 | * !!!!!!!!!!!!! |
| 1168 | * the parent of an attribute or namespace node is the element |
| 1169 | * to which the attribute or namespace node is attached |
| 1170 | */ |
| 1171 | if (cur == NULL) |
| 1172 | return(ctxt->context->node->parent); |
| 1173 | if (cur == ctxt->context->doc->root) return(NULL); |
| 1174 | return(cur->parent); |
| 1175 | } |
| 1176 | |
| 1177 | /** |
| 1178 | * xmlXPathNextAncestorOrSelf: |
| 1179 | * @ctxt: the XPath Parser context |
| 1180 | * @cur: the current node in the traversal |
| 1181 | * |
| 1182 | * Traversal function for the "ancestor-or-self" direction |
| 1183 | * he ancestor-or-self axis contains the context node and ancestors of the context |
| 1184 | * node in reverse document order; thus the context node is the first node on the |
| 1185 | * axis, and the context node's parent the second; parent here is defined the same |
| 1186 | * as with the parent axis. |
| 1187 | */ |
| 1188 | xmlNodePtr |
| 1189 | xmlXPathNextAncestorOrSelf(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { |
| 1190 | /* |
| 1191 | * !!!!!!!!!!!!! |
| 1192 | * the parent of an attribute or namespace node is the element |
| 1193 | * to which the attribute or namespace node is attached |
| 1194 | */ |
| 1195 | if (cur == NULL) |
| 1196 | return(ctxt->context->node); |
| 1197 | if (cur == ctxt->context->doc->root) return(NULL); |
| 1198 | return(cur->parent); |
| 1199 | } |
| 1200 | |
| 1201 | /** |
| 1202 | * xmlXPathNextFollowingSibling: |
| 1203 | * @ctxt: the XPath Parser context |
| 1204 | * @cur: the current node in the traversal |
| 1205 | * |
| 1206 | * Traversal function for the "following-sibling" direction |
| 1207 | * The following-sibling axis contains the following siblings of the context |
| 1208 | * node in document order. |
| 1209 | */ |
| 1210 | xmlNodePtr |
| 1211 | xmlXPathNextFollowingSibling(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { |
| 1212 | if (cur == NULL) |
| 1213 | return(ctxt->context->node->next); |
| 1214 | return(cur->next); |
| 1215 | } |
| 1216 | |
| 1217 | /** |
| 1218 | * xmlXPathNextPrecedingSibling: |
| 1219 | * @ctxt: the XPath Parser context |
| 1220 | * @cur: the current node in the traversal |
| 1221 | * |
| 1222 | * Traversal function for the "preceding-sibling" direction |
| 1223 | * The preceding-sibling axis contains the preceding siblings of the context |
| 1224 | * node in reverse document order; the first preceding sibling is first on the |
| 1225 | * axis; the sibling preceding that node is the second on the axis and so on. |
| 1226 | */ |
| 1227 | xmlNodePtr |
| 1228 | xmlXPathNextPrecedingSibling(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { |
| 1229 | if (cur == NULL) |
| 1230 | return(ctxt->context->node->prev); |
| 1231 | return(cur->prev); |
| 1232 | } |
| 1233 | |
| 1234 | /** |
| 1235 | * xmlXPathNextFollowing: |
| 1236 | * @ctxt: the XPath Parser context |
| 1237 | * @cur: the current node in the traversal |
| 1238 | * |
| 1239 | * Traversal function for the "following" direction |
| 1240 | * The following axis contains all nodes in the same document as the context |
| 1241 | * node that are after the context node in document order, excluding any |
| 1242 | * descendants and excluding attribute nodes and namespace nodes; the nodes |
| 1243 | * are ordered in document order |
| 1244 | */ |
| 1245 | xmlNodePtr |
| 1246 | xmlXPathNextFollowing(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { |
| 1247 | if (cur == NULL) |
| 1248 | return(ctxt->context->node->next);; /* !!!!!!!!! */ |
| 1249 | if (cur->childs != NULL) return(cur->childs); |
| 1250 | if (cur->next != NULL) return(cur->next); |
| 1251 | |
| 1252 | do { |
| 1253 | cur = cur->parent; |
| 1254 | if (cur == NULL) return(NULL); |
| 1255 | if (cur == ctxt->context->doc->root) return(NULL); |
| 1256 | if (cur->next != NULL) { |
| 1257 | cur = cur->next; |
| 1258 | return(cur); |
| 1259 | } |
| 1260 | } while (cur != NULL); |
| 1261 | return(cur); |
| 1262 | } |
| 1263 | |
| 1264 | /** |
| 1265 | * xmlXPathNextPreceding: |
| 1266 | * @ctxt: the XPath Parser context |
| 1267 | * @cur: the current node in the traversal |
| 1268 | * |
| 1269 | * Traversal function for the "preceding" direction |
| 1270 | * the preceding axis contains all nodes in the same document as the context |
| 1271 | * node that are before the context node in document order, excluding any |
| 1272 | * ancestors and excluding attribute nodes and namespace nodes; the nodes are |
| 1273 | * ordered in reverse document order |
| 1274 | */ |
| 1275 | xmlNodePtr |
| 1276 | xmlXPathNextPreceding(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { |
| 1277 | if (cur == NULL) |
| 1278 | return(ctxt->context->node->prev); /* !!!!!!!!! */ |
| 1279 | if (cur->last != NULL) return(cur->last); |
| 1280 | if (cur->prev != NULL) return(cur->prev); |
| 1281 | |
| 1282 | do { |
| 1283 | cur = cur->parent; |
| 1284 | if (cur == NULL) return(NULL); |
| 1285 | if (cur == ctxt->context->doc->root) return(NULL); |
| 1286 | if (cur->prev != NULL) { |
| 1287 | cur = cur->prev; |
| 1288 | return(cur); |
| 1289 | } |
| 1290 | } while (cur != NULL); |
| 1291 | return(cur); |
| 1292 | } |
| 1293 | |
| 1294 | /** |
| 1295 | * xmlXPathNextNamespace: |
| 1296 | * @ctxt: the XPath Parser context |
| 1297 | * @cur: the current attribute in the traversal |
| 1298 | * |
| 1299 | * Traversal function for the "namespace" direction |
| 1300 | * the namespace axis contains the namespace nodes of the context node; |
| 1301 | * the order of nodes on this axis is implementation-defined; the axis will |
| 1302 | * be empty unless the context node is an element |
| 1303 | */ |
| 1304 | xmlAttrPtr |
| 1305 | xmlXPathNextNamespace(xmlXPathParserContextPtr ctxt, xmlAttrPtr cur) { |
| 1306 | TODO /* namespace traversal */ |
| 1307 | return(NULL); |
| 1308 | } |
| 1309 | |
| 1310 | /** |
| 1311 | * xmlXPathNextAttribute: |
| 1312 | * @ctxt: the XPath Parser context |
| 1313 | * @cur: the current attribute in the traversal |
| 1314 | * |
| 1315 | * Traversal function for the "attribute" direction |
| 1316 | */ |
| 1317 | xmlAttrPtr |
| 1318 | xmlXPathNextAttribute(xmlXPathParserContextPtr ctxt, xmlAttrPtr cur) { |
| 1319 | if (cur == NULL) |
| 1320 | return(ctxt->context->node->properties); |
| 1321 | return(cur->next); |
| 1322 | } |
| 1323 | |
| 1324 | /************************************************************************ |
| 1325 | * * |
| 1326 | * NodeTest Functions * |
| 1327 | * * |
| 1328 | ************************************************************************/ |
| 1329 | |
| 1330 | #define NODE_TEST_NONE 0 |
| 1331 | #define NODE_TEST_TYPE 1 |
| 1332 | #define NODE_TEST_PI 2 |
| 1333 | #define NODE_TEST_ALL 3 |
| 1334 | #define NODE_TEST_NS 4 |
| 1335 | #define NODE_TEST_NAME 5 |
| 1336 | |
| 1337 | #define NODE_TYPE_COMMENT 50 |
| 1338 | #define NODE_TYPE_TEXT 51 |
| 1339 | #define NODE_TYPE_PI 52 |
| 1340 | #define NODE_TYPE_NODE 53 |
| 1341 | |
| 1342 | #define IS_FUNCTION 200 |
| 1343 | |
| 1344 | /** |
| 1345 | * xmlXPathNodeCollectAndTest: |
| 1346 | * @ctxt: the XPath Parser context |
| 1347 | * @cur: the current node to test |
| 1348 | * |
| 1349 | * This is the function implementing a step: based on the current list |
| 1350 | * of nodes, it builds up a new list, looking at all nodes under that |
| 1351 | * axis and selecting them. |
| 1352 | * |
| 1353 | * Returns the new NodeSet resulting from the search. |
| 1354 | */ |
| 1355 | xmlNodeSetPtr |
| 1356 | xmlXPathNodeCollectAndTest(xmlXPathParserContextPtr ctxt, int axis, |
| 1357 | int test, int type, const CHAR *prefix, const CHAR *name) { |
| 1358 | #ifdef DEBUG_STEP |
| 1359 | int n = 0, t = 0; |
| 1360 | #endif |
| 1361 | int i; |
| 1362 | xmlNodeSetPtr ret; |
| 1363 | xmlXPathTraversalFunction next = NULL; |
| 1364 | xmlNodePtr cur = NULL; |
| 1365 | |
| 1366 | if (ctxt->context->nodelist == NULL) { |
| 1367 | if (ctxt->context->node == NULL) { |
| 1368 | fprintf(xmlXPathDebug, |
| 1369 | "xmlXPathNodeCollectAndTest %s:%d : nodelist and node are NULL\n", |
| 1370 | __FILE__, __LINE__); |
| 1371 | return(NULL); |
| 1372 | } |
| 1373 | STRANGE |
| 1374 | return(NULL); |
| 1375 | } |
| 1376 | #ifdef DEBUG_STEP |
| 1377 | fprintf(xmlXPathDebug, "new step : "); |
| 1378 | #endif |
| 1379 | switch (axis) { |
| 1380 | case AXIS_ANCESTOR: |
| 1381 | #ifdef DEBUG_STEP |
| 1382 | fprintf(xmlXPathDebug, "axis 'ancestors' "); |
| 1383 | #endif |
| 1384 | next = xmlXPathNextAncestor; break; |
| 1385 | case AXIS_ANCESTOR_OR_SELF: |
| 1386 | #ifdef DEBUG_STEP |
| 1387 | fprintf(xmlXPathDebug, "axis 'ancestors-or-self' "); |
| 1388 | #endif |
| 1389 | next = xmlXPathNextAncestorOrSelf; break; |
| 1390 | case AXIS_ATTRIBUTE: |
| 1391 | #ifdef DEBUG_STEP |
| 1392 | fprintf(xmlXPathDebug, "axis 'attributes' "); |
| 1393 | #endif |
| 1394 | TODO /* attribute axis */ |
| 1395 | break; |
| 1396 | case AXIS_CHILD: |
| 1397 | #ifdef DEBUG_STEP |
| 1398 | fprintf(xmlXPathDebug, "axis 'child' "); |
| 1399 | #endif |
| 1400 | next = xmlXPathNextChild; break; |
| 1401 | case AXIS_DESCENDANT: |
| 1402 | #ifdef DEBUG_STEP |
| 1403 | fprintf(xmlXPathDebug, "axis 'descendant' "); |
| 1404 | #endif |
| 1405 | next = xmlXPathNextDescendant; break; |
| 1406 | case AXIS_DESCENDANT_OR_SELF: |
| 1407 | #ifdef DEBUG_STEP |
| 1408 | fprintf(xmlXPathDebug, "axis 'descendant-or-self' "); |
| 1409 | #endif |
| 1410 | next = xmlXPathNextDescendantOrSelf; break; |
| 1411 | case AXIS_FOLLOWING: |
| 1412 | #ifdef DEBUG_STEP |
| 1413 | fprintf(xmlXPathDebug, "axis 'following' "); |
| 1414 | #endif |
| 1415 | next = xmlXPathNextFollowing; break; |
| 1416 | case AXIS_FOLLOWING_SIBLING: |
| 1417 | #ifdef DEBUG_STEP |
| 1418 | fprintf(xmlXPathDebug, "axis 'following-siblings' "); |
| 1419 | #endif |
| 1420 | next = xmlXPathNextFollowingSibling; break; |
| 1421 | case AXIS_NAMESPACE: |
| 1422 | #ifdef DEBUG_STEP |
| 1423 | fprintf(xmlXPathDebug, "axis 'namespace' "); |
| 1424 | #endif |
| 1425 | TODO /* namespace axis */ |
| 1426 | break; |
| 1427 | case AXIS_PARENT: |
| 1428 | #ifdef DEBUG_STEP |
| 1429 | fprintf(xmlXPathDebug, "axis 'parent' "); |
| 1430 | #endif |
| 1431 | next = xmlXPathNextParent; break; |
| 1432 | case AXIS_PRECEDING: |
| 1433 | #ifdef DEBUG_STEP |
| 1434 | fprintf(xmlXPathDebug, "axis 'preceding' "); |
| 1435 | #endif |
| 1436 | next = xmlXPathNextPreceding; break; |
| 1437 | case AXIS_PRECEDING_SIBLING: |
| 1438 | #ifdef DEBUG_STEP |
| 1439 | fprintf(xmlXPathDebug, "axis 'preceding-sibling' "); |
| 1440 | #endif |
| 1441 | next = xmlXPathNextPrecedingSibling; break; |
| 1442 | case AXIS_SELF: |
| 1443 | #ifdef DEBUG_STEP |
| 1444 | fprintf(xmlXPathDebug, "axis 'self' "); |
| 1445 | #endif |
| 1446 | next = xmlXPathNextSelf; break; |
| 1447 | } |
| 1448 | if (next == NULL) return(NULL); |
| 1449 | ret = xmlXPathNodeSetCreate(NULL); |
| 1450 | #ifdef DEBUG_STEP |
| 1451 | fprintf(xmlXPathDebug, " context contains %d nodes\n", |
| 1452 | ctxt->context->nodelist->nodeNr); |
| 1453 | switch (test) { |
| 1454 | case NODE_TEST_NONE: |
| 1455 | fprintf(xmlXPathDebug, " seaching for none !!!\n"); |
| 1456 | break; |
| 1457 | case NODE_TEST_TYPE: |
| 1458 | fprintf(xmlXPathDebug, " seaching for type %d\n", type); |
| 1459 | break; |
| 1460 | case NODE_TEST_PI: |
| 1461 | fprintf(xmlXPathDebug, " seaching for PI !!!\n"); |
| 1462 | TODO /* PI search */ |
| 1463 | break; |
| 1464 | case NODE_TEST_ALL: |
| 1465 | fprintf(xmlXPathDebug, " seaching for *\n"); |
| 1466 | break; |
| 1467 | case NODE_TEST_NS: |
| 1468 | fprintf(xmlXPathDebug, " seaching for namespace %s\n", |
| 1469 | prefix); |
| 1470 | break; |
| 1471 | case NODE_TEST_NAME: |
| 1472 | fprintf(xmlXPathDebug, " seaching for name %s\n", name); |
| 1473 | if (prefix != NULL) |
| 1474 | fprintf(xmlXPathDebug, " with namespace %s\n", |
| 1475 | prefix); |
| 1476 | break; |
| 1477 | } |
| 1478 | fprintf(xmlXPathDebug, "Testing : "); |
| 1479 | #endif |
| 1480 | for (i = 0;i < ctxt->context->nodelist->nodeNr; i++) { |
| 1481 | ctxt->context->node = ctxt->context->nodelist->nodeTab[i]; |
| 1482 | |
| 1483 | cur = NULL; |
| 1484 | do { |
| 1485 | cur = next(ctxt, cur); |
| 1486 | if (cur == NULL) break; |
| 1487 | #ifdef DEBUG_STEP |
| 1488 | t++; |
| 1489 | fprintf(xmlXPathDebug, " %s", cur->name); |
| 1490 | #endif |
| 1491 | switch (test) { |
| 1492 | case NODE_TEST_NONE: |
| 1493 | STRANGE |
| 1494 | return(NULL); |
| 1495 | case NODE_TEST_TYPE: |
| 1496 | if (cur->type == type) { |
| 1497 | #ifdef DEBUG_STEP |
| 1498 | n++; |
| 1499 | #endif |
| 1500 | xmlXPathNodeSetAdd(ret, cur); |
| 1501 | } |
| 1502 | break; |
| 1503 | case NODE_TEST_PI: |
| 1504 | TODO /* PI search */ |
| 1505 | break; |
| 1506 | case NODE_TEST_ALL: |
| 1507 | if (cur->type == XML_ELEMENT_NODE) { |
| 1508 | #ifdef DEBUG_STEP |
| 1509 | n++; |
| 1510 | #endif |
| 1511 | xmlXPathNodeSetAdd(ret, cur); |
| 1512 | } |
| 1513 | break; |
| 1514 | case NODE_TEST_NS: |
| 1515 | TODO /* NS search */ |
| 1516 | break; |
| 1517 | case NODE_TEST_NAME: |
| 1518 | if (!xmlStrcmp(name, cur->name) && |
| 1519 | (((prefix == NULL) || |
| 1520 | ((cur->ns != NULL) && |
| 1521 | (!xmlStrcmp(prefix, cur->ns->href)))))) { |
| 1522 | #ifdef DEBUG_STEP |
| 1523 | n++; |
| 1524 | #endif |
| 1525 | xmlXPathNodeSetAdd(ret, cur); |
| 1526 | } |
| 1527 | break; |
| 1528 | |
| 1529 | } |
| 1530 | } while (cur != NULL); |
| 1531 | } |
| 1532 | #ifdef DEBUG_STEP |
| 1533 | fprintf(xmlXPathDebug, |
| 1534 | "\nExamined %d nodes, found %d nodes at that step\n", t, n); |
| 1535 | #endif |
| 1536 | return(ret); |
| 1537 | } |
| 1538 | |
| 1539 | |
| 1540 | /************************************************************************ |
| 1541 | * * |
| 1542 | * Implicit tree core function library * |
| 1543 | * * |
| 1544 | ************************************************************************/ |
| 1545 | |
| 1546 | /** |
| 1547 | * xmlXPathRoot: |
| 1548 | * @ctxt: the XPath Parser context |
| 1549 | * |
| 1550 | * Initialize the context to the root of the document |
| 1551 | */ |
| 1552 | void |
| 1553 | xmlXPathRoot(xmlXPathParserContextPtr ctxt) { |
| 1554 | if (ctxt->context->nodelist != NULL) |
| 1555 | xmlXPathFreeNodeSet(ctxt->context->nodelist); |
| 1556 | ctxt->context->node = ctxt->context->doc->root; |
| 1557 | ctxt->context->nodelist = xmlXPathNodeSetCreate(ctxt->context->doc->root); |
| 1558 | } |
| 1559 | |
| 1560 | /** |
| 1561 | * xmlXPathSearchPI: |
| 1562 | * @ctxt: the XPath Parser context |
| 1563 | * |
| 1564 | * Search a processing instruction by name. The name is |
| 1565 | * in the object on the stack. |
| 1566 | */ |
| 1567 | void |
| 1568 | xmlXPathSearchPI(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1569 | TODO /* Search PI */ |
| 1570 | CHECK_ARITY(0); |
| 1571 | CHECK_TYPE(XPATH_NUMBER) |
| 1572 | } |
| 1573 | |
| 1574 | /************************************************************************ |
| 1575 | * * |
| 1576 | * The explicit core function library * |
| 1577 | *http://www.w3.org/Style/XSL/Group/1999/07/xpath-19990705.html#corelib * |
| 1578 | * * |
| 1579 | ************************************************************************/ |
| 1580 | |
| 1581 | |
| 1582 | /** |
| 1583 | * xmlXPathLastFunction: |
| 1584 | * @ctxt: the XPath Parser context |
| 1585 | * |
| 1586 | * Implement the last() XPath function |
| 1587 | * The last function returns the number of nodes in the context node list. |
| 1588 | */ |
| 1589 | void |
| 1590 | xmlXPathLastFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1591 | CHECK_ARITY(0); |
| 1592 | if ((ctxt->context->nodelist == NULL) || |
| 1593 | (ctxt->context->node == NULL) || |
| 1594 | (ctxt->context->nodelist->nodeNr == 0)) { |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 1595 | valuePush(ctxt, xmlXPathNewFloat((double) 0)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 1596 | } else { |
| 1597 | valuePush(ctxt, |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 1598 | xmlXPathNewFloat((double) ctxt->context->nodelist->nodeNr)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 1599 | } |
| 1600 | } |
| 1601 | |
| 1602 | /** |
| 1603 | * xmlXPathPositionFunction: |
| 1604 | * @ctxt: the XPath Parser context |
| 1605 | * |
| 1606 | * Implement the position() XPath function |
| 1607 | * The position function returns the position of the context node in the |
| 1608 | * context node list. The first position is 1, and so the last positionr |
| 1609 | * will be equal to last(). |
| 1610 | */ |
| 1611 | void |
| 1612 | xmlXPathPositionFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1613 | int i; |
| 1614 | |
| 1615 | CHECK_ARITY(0); |
| 1616 | if ((ctxt->context->nodelist == NULL) || |
| 1617 | (ctxt->context->node == NULL) || |
| 1618 | (ctxt->context->nodelist->nodeNr == 0)) { |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 1619 | valuePush(ctxt, xmlXPathNewFloat((double) 0)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 1620 | } |
| 1621 | for (i = 0; i < ctxt->context->nodelist->nodeNr;i++) { |
| 1622 | if (ctxt->context->node == ctxt->context->nodelist->nodeTab[i]) { |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 1623 | valuePush(ctxt, xmlXPathNewFloat((double) i + 1)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 1624 | return; |
| 1625 | } |
| 1626 | } |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 1627 | valuePush(ctxt, xmlXPathNewFloat((double) 0)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 1628 | } |
| 1629 | |
| 1630 | /** |
| 1631 | * xmlXPathCountFunction: |
| 1632 | * @ctxt: the XPath Parser context |
| 1633 | * |
| 1634 | * Implement the count() XPath function |
| 1635 | */ |
| 1636 | void |
| 1637 | xmlXPathCountFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1638 | xmlXPathObjectPtr cur; |
| 1639 | |
| 1640 | CHECK_ARITY(1); |
| 1641 | CHECK_TYPE(XPATH_NODESET); |
| 1642 | cur = valuePop(ctxt); |
| 1643 | |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 1644 | valuePush(ctxt, xmlXPathNewFloat((double) cur->nodesetval->nodeNr)); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 1645 | xmlXPathFreeObject(cur); |
| 1646 | } |
| 1647 | |
| 1648 | /** |
| 1649 | * xmlXPathIdFunction: |
| 1650 | * @ctxt: the XPath Parser context |
| 1651 | * |
| 1652 | * Implement the id() XPath function |
| 1653 | * The id function selects elements by their unique ID |
| 1654 | * (see [5.2.1 Unique IDs]). When the argument to id is of type node-set, |
| 1655 | * then the result is the union of the result of applying id to the |
| 1656 | * string value of each of the nodes in the argument node-set. When the |
| 1657 | * argument to id is of any other type, the argument is converted to a |
| 1658 | * string as if by a call to the string function; the string is split |
| 1659 | * into a whitespace-separated list of tokens (whitespace is any sequence |
| 1660 | * of characters matching the production S); the result is a node-set |
| 1661 | * containing the elements in the same document as the context node that |
| 1662 | * have a unique ID equal to any of the tokens in the list. |
| 1663 | */ |
| 1664 | void |
| 1665 | xmlXPathIdFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1666 | CHECK_ARITY(1); |
| 1667 | TODO /* Write ID/IDREF support in libxml first */ |
| 1668 | } |
| 1669 | |
| 1670 | /** |
| 1671 | * xmlXPathLocalPartFunction: |
| 1672 | * @ctxt: the XPath Parser context |
| 1673 | * |
| 1674 | * Implement the local-part() XPath function |
| 1675 | * The local-part function returns a string containing the local part |
| 1676 | * of the name of the node in the argument node-set that is first in |
| 1677 | * document order. If the node-set is empty or the first node has no |
| 1678 | * name, an empty string is returned. If the argument is omitted it |
| 1679 | * defaults to the context node. |
| 1680 | */ |
| 1681 | void |
| 1682 | xmlXPathLocalPartFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1683 | xmlXPathObjectPtr cur; |
| 1684 | |
| 1685 | CHECK_ARITY(1); |
| 1686 | CHECK_TYPE(XPATH_NODESET); |
| 1687 | cur = valuePop(ctxt); |
| 1688 | |
| 1689 | if (cur->nodesetval->nodeNr == 0) { |
| 1690 | valuePush(ctxt, xmlXPathNewString("")); |
| 1691 | } else { |
| 1692 | int i = 0; /* Should be first in document order !!!!! */ |
| 1693 | valuePush(ctxt, xmlXPathNewString(cur->nodesetval->nodeTab[i]->name)); |
| 1694 | } |
| 1695 | xmlXPathFreeObject(cur); |
| 1696 | } |
| 1697 | |
| 1698 | /** |
| 1699 | * xmlXPathNamespaceFunction: |
| 1700 | * @ctxt: the XPath Parser context |
| 1701 | * |
| 1702 | * Implement the namespace() XPath function |
| 1703 | * The namespace function returns a string containing the namespace URI |
| 1704 | * of the expanded name of the node in the argument node-set that is |
| 1705 | * first in document order. If the node-set is empty, the first node has |
| 1706 | * no name, or the expanded name has no namespace URI, an empty string |
| 1707 | * is returned. If the argument is omitted it defaults to the context node. |
| 1708 | */ |
| 1709 | void |
| 1710 | xmlXPathNamespaceFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1711 | xmlXPathObjectPtr cur; |
| 1712 | |
| 1713 | CHECK_ARITY(1); |
| 1714 | CHECK_TYPE(XPATH_NODESET); |
| 1715 | cur = valuePop(ctxt); |
| 1716 | |
| 1717 | if (cur->nodesetval->nodeNr == 0) { |
| 1718 | valuePush(ctxt, xmlXPathNewString("")); |
| 1719 | } else { |
| 1720 | int i = 0; /* Should be first in document order !!!!! */ |
| 1721 | |
| 1722 | if (cur->nodesetval->nodeTab[i]->ns == NULL) |
| 1723 | valuePush(ctxt, xmlXPathNewString("")); |
| 1724 | else |
| 1725 | valuePush(ctxt, xmlXPathNewString( |
| 1726 | cur->nodesetval->nodeTab[i]->ns->href)); |
| 1727 | } |
| 1728 | xmlXPathFreeObject(cur); |
| 1729 | } |
| 1730 | |
| 1731 | /** |
| 1732 | * xmlXPathNameFunction: |
| 1733 | * @ctxt: the XPath Parser context |
| 1734 | * |
| 1735 | * Implement the name() XPath function |
| 1736 | * The name function returns a string containing a QName representing |
| 1737 | * the name of the node in the argument node-set that is first in documenti |
| 1738 | * order. The QName must represent the name with respect to the namespace |
| 1739 | * declarations in effect on the node whose name is being represented. |
| 1740 | * Typically, this will be the form in which the name occurred in the XML |
| 1741 | * source. This need not be the case if there are namespace declarations |
| 1742 | * in effect on the node that associate multiple prefixes with the same |
| 1743 | * namespace. However, an implementation may include information about |
| 1744 | * the original prefix in its representation of nodes; in this case, an |
| 1745 | * implementation can ensure that the returned string is always the same |
| 1746 | * as the QName used in the XML source. If the argument it omitted it |
| 1747 | * defaults to the context node. |
| 1748 | * Libxml keep the original prefix so the "real qualified name" used is |
| 1749 | * returned. |
| 1750 | */ |
| 1751 | void |
| 1752 | xmlXPathNameFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1753 | xmlXPathObjectPtr cur; |
| 1754 | |
| 1755 | CHECK_ARITY(1); |
| 1756 | CHECK_TYPE(XPATH_NODESET); |
| 1757 | cur = valuePop(ctxt); |
| 1758 | |
| 1759 | if (cur->nodesetval->nodeNr == 0) { |
| 1760 | valuePush(ctxt, xmlXPathNewString("")); |
| 1761 | } else { |
| 1762 | int i = 0; /* Should be first in document order !!!!! */ |
| 1763 | |
| 1764 | if (cur->nodesetval->nodeTab[i]->ns == NULL) |
| 1765 | valuePush(ctxt, xmlXPathNewString( |
| 1766 | cur->nodesetval->nodeTab[i]->name)); |
| 1767 | |
| 1768 | else { |
| 1769 | CHAR name[2000]; |
| 1770 | sprintf(name, "%s:%s", cur->nodesetval->nodeTab[i]->ns->prefix, |
| 1771 | cur->nodesetval->nodeTab[i]->name); |
| 1772 | valuePush(ctxt, xmlXPathNewString(name)); |
| 1773 | } |
| 1774 | } |
| 1775 | xmlXPathFreeObject(cur); |
| 1776 | } |
| 1777 | |
| 1778 | /** |
| 1779 | * xmlXPathStringFunction: |
| 1780 | * @ctxt: the XPath Parser context |
| 1781 | * |
| 1782 | * Implement the string() XPath function |
| 1783 | * he string function converts an object to a string as follows: |
| 1784 | * - A node-set is converted to a string by returning the value of |
| 1785 | * the node in the node-set that is first in document order. |
| 1786 | * If the node-set is empty, an empty string is returned. |
| 1787 | * - A number is converted to a string as follows |
| 1788 | * + NaN is converted to the string NaN |
| 1789 | * + positive zero is converted to the string 0 |
| 1790 | * + negative zero is converted to the string 0 |
| 1791 | * + positive infinity is converted to the string Infinity |
| 1792 | * + negative infinity is converted to the string -Infinity |
| 1793 | * + if the number is an integer, the number is represented in |
| 1794 | * decimal form as a Number with no decimal point and no leading |
| 1795 | * zeros, preceded by a minus sign (-) if the number is negative |
| 1796 | * + otherwise, the number is represented in decimal form as a |
| 1797 | * Number including a decimal point with at least one digit |
| 1798 | * before the decimal point and at least one digit after the |
| 1799 | * decimal point, preceded by a minus sign (-) if the number |
| 1800 | * is negative; there must be no leading zeros before the decimal |
| 1801 | * point apart possibly from the one required digit immediatelyi |
| 1802 | * before the decimal point; beyond the one required digit |
| 1803 | * after the decimal point there must be as many, but only as |
| 1804 | * many, more digits as are needed to uniquely distinguish the |
| 1805 | * number from all other IEEE 754 numeric values. |
| 1806 | * - The boolean false value is converted to the string false. |
| 1807 | * The boolean true value is converted to the string true. |
| 1808 | */ |
| 1809 | void |
| 1810 | xmlXPathStringFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1811 | xmlXPathObjectPtr cur; |
| 1812 | |
| 1813 | CHECK_ARITY(1); |
| 1814 | cur = valuePop(ctxt); |
| 1815 | if (cur == NULL) ERROR(XPATH_INVALID_OPERAND); |
| 1816 | switch (cur->type) { |
| 1817 | case XPATH_NODESET: |
| 1818 | if (cur->nodesetval->nodeNr == 0) { |
| 1819 | valuePush(ctxt, xmlXPathNewString("")); |
| 1820 | } else { |
| 1821 | CHAR *res; |
| 1822 | int i = 0; /* Should be first in document order !!!!! */ |
| 1823 | res = xmlNodeGetContent(cur->nodesetval->nodeTab[i]); |
| 1824 | valuePush(ctxt, xmlXPathNewString(res)); |
| 1825 | free(res); |
| 1826 | } |
| 1827 | xmlXPathFreeObject(cur); |
| 1828 | return; |
| 1829 | case XPATH_STRING: |
| 1830 | valuePush(ctxt, cur); |
| 1831 | return; |
| 1832 | case XPATH_BOOLEAN: |
| 1833 | if (cur->boolval) valuePush(ctxt, xmlXPathNewString("true")); |
| 1834 | else valuePush(ctxt, xmlXPathNewString("false")); |
| 1835 | xmlXPathFreeObject(cur); |
| 1836 | return; |
| 1837 | case XPATH_NUMBER: { |
| 1838 | CHAR buf[100]; |
| 1839 | |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 1840 | if (isnan(cur->floatval)) |
| 1841 | sprintf(buf, "NaN"); |
| 1842 | else if (isinf(cur->floatval) > 0) |
| 1843 | sprintf(buf, "+Infinity"); |
| 1844 | else if (isinf(cur->floatval) < 0) |
| 1845 | sprintf(buf, "-Infinity"); |
| 1846 | else |
| 1847 | sprintf(buf, "%0g", cur->floatval); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 1848 | valuePush(ctxt, xmlXPathNewString(buf)); |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 1849 | xmlXPathFreeObject(cur); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 1850 | return; |
| 1851 | } |
| 1852 | } |
| 1853 | STRANGE |
| 1854 | } |
| 1855 | |
| 1856 | /** |
| 1857 | * xmlXPathStringLengthFunction: |
| 1858 | * @ctxt: the XPath Parser context |
| 1859 | * |
| 1860 | * Implement the string-length() XPath function |
| 1861 | * The string-length returns the number of characters in the string |
| 1862 | * (see [3.6 Strings]). If the argument is omitted, it defaults to |
| 1863 | * the context node converted to a string, in other words the value |
| 1864 | * of the context node. |
| 1865 | */ |
| 1866 | void |
| 1867 | xmlXPathStringLengthFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1868 | xmlXPathObjectPtr cur; |
| 1869 | |
| 1870 | if (nargs == 0) { |
| 1871 | if (ctxt->context->node == NULL) { |
| 1872 | valuePush(ctxt, xmlXPathNewFloat(0)); |
| 1873 | } else { |
| 1874 | CHAR *content; |
| 1875 | |
| 1876 | content = xmlNodeGetContent(ctxt->context->node); |
| 1877 | valuePush(ctxt, xmlXPathNewFloat(xmlStrlen(content))); |
| 1878 | free(content); |
| 1879 | } |
| 1880 | return; |
| 1881 | } |
| 1882 | CHECK_ARITY(1); |
| 1883 | CHECK_TYPE(XPATH_STRING); |
| 1884 | cur = valuePop(ctxt); |
| 1885 | valuePush(ctxt, xmlXPathNewFloat(xmlStrlen(cur->stringval))); |
| 1886 | xmlXPathFreeObject(cur); |
| 1887 | } |
| 1888 | |
| 1889 | /** |
| 1890 | * xmlXPathConcatFunction: |
| 1891 | * @ctxt: the XPath Parser context |
| 1892 | * |
| 1893 | * Implement the concat() XPath function |
| 1894 | * The concat function returns the concatenation of its arguments. |
| 1895 | */ |
| 1896 | void |
| 1897 | xmlXPathConcatFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1898 | xmlXPathObjectPtr cur, new; |
| 1899 | CHAR *tmp; |
| 1900 | |
| 1901 | if (nargs < 2) { |
| 1902 | CHECK_ARITY(2); |
| 1903 | } |
| 1904 | |
| 1905 | cur = valuePop(ctxt); |
| 1906 | if ((cur == NULL) || (cur->type != XPATH_STRING)) { |
| 1907 | xmlXPathFreeObject(cur); |
| 1908 | return; |
| 1909 | } |
| 1910 | nargs--; |
| 1911 | |
| 1912 | while (nargs > 0) { |
| 1913 | new = valuePop(ctxt); |
| 1914 | if ((new == NULL) || (new->type != XPATH_STRING)) { |
| 1915 | xmlXPathFreeObject(new); |
| 1916 | xmlXPathFreeObject(cur); |
| 1917 | ERROR(XPATH_INVALID_TYPE); |
| 1918 | } |
| 1919 | tmp = xmlStrcat(new->stringval, cur->stringval); |
| 1920 | new->stringval = cur->stringval; |
| 1921 | cur->stringval = tmp; |
| 1922 | |
| 1923 | xmlXPathFreeObject(new); |
| 1924 | nargs--; |
| 1925 | } |
| 1926 | valuePush(ctxt, cur); |
| 1927 | } |
| 1928 | |
| 1929 | /** |
| 1930 | * xmlXPathContainsFunction: |
| 1931 | * @ctxt: the XPath Parser context |
| 1932 | * |
| 1933 | * Implement the contains() XPath function |
| 1934 | * The contains function returns true if the first argument string |
| 1935 | * contains the second argument string, and otherwise returns false. |
| 1936 | */ |
| 1937 | void |
| 1938 | xmlXPathContainsFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1939 | xmlXPathObjectPtr hay, needle; |
| 1940 | |
| 1941 | CHECK_ARITY(2); |
| 1942 | CHECK_TYPE(XPATH_STRING); |
| 1943 | needle = valuePop(ctxt); |
| 1944 | hay = valuePop(ctxt); |
| 1945 | if ((hay == NULL) || (hay->type != XPATH_STRING)) { |
| 1946 | xmlXPathFreeObject(hay); |
| 1947 | xmlXPathFreeObject(needle); |
| 1948 | ERROR(XPATH_INVALID_TYPE); |
| 1949 | } |
| 1950 | if (xmlStrstr(hay->stringval, needle->stringval)) |
| 1951 | valuePush(ctxt, xmlXPathNewBoolean(1)); |
| 1952 | else |
| 1953 | valuePush(ctxt, xmlXPathNewBoolean(0)); |
| 1954 | xmlXPathFreeObject(hay); |
| 1955 | xmlXPathFreeObject(needle); |
| 1956 | } |
| 1957 | |
| 1958 | /** |
| 1959 | * xmlXPathStartsWithFunction: |
| 1960 | * @ctxt: the XPath Parser context |
| 1961 | * |
| 1962 | * Implement the starts-with() XPath function |
| 1963 | * The starts-with function returns true if the first argument string |
| 1964 | * starts with the second argument string, and otherwise returns false. |
| 1965 | */ |
| 1966 | void |
| 1967 | xmlXPathStartsWithFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 1968 | xmlXPathObjectPtr hay, needle; |
| 1969 | int n; |
| 1970 | |
| 1971 | CHECK_ARITY(2); |
| 1972 | CHECK_TYPE(XPATH_STRING); |
| 1973 | needle = valuePop(ctxt); |
| 1974 | hay = valuePop(ctxt); |
| 1975 | if ((hay == NULL) || (hay->type != XPATH_STRING)) { |
| 1976 | xmlXPathFreeObject(hay); |
| 1977 | xmlXPathFreeObject(needle); |
| 1978 | ERROR(XPATH_INVALID_TYPE); |
| 1979 | } |
| 1980 | n = xmlStrlen(needle->stringval); |
| 1981 | if (xmlStrncmp(hay->stringval, needle->stringval, n)) |
| 1982 | valuePush(ctxt, xmlXPathNewBoolean(0)); |
| 1983 | else |
| 1984 | valuePush(ctxt, xmlXPathNewBoolean(1)); |
| 1985 | xmlXPathFreeObject(hay); |
| 1986 | xmlXPathFreeObject(needle); |
| 1987 | } |
| 1988 | |
| 1989 | /** |
| 1990 | * xmlXPathSubstringFunction: |
| 1991 | * @ctxt: the XPath Parser context |
| 1992 | * |
| 1993 | * Implement the substring() XPath function |
| 1994 | * The substring function returns the substring of the first argument |
| 1995 | * starting at the position specified in the second argument with |
| 1996 | * length specified in the third argument. For example, |
| 1997 | * substring("12345",2,3) returns "234". If the third argument is not |
| 1998 | * specified, it returns the substring starting at the position specified |
| 1999 | * in the second argument and continuing to the end of the string. For |
| 2000 | * example, substring("12345",2) returns "2345". More precisely, each |
| 2001 | * character in the string (see [3.6 Strings]) is considered to have a |
| 2002 | * numeric position: the position of the first character is 1, the position |
| 2003 | * of the second character is 2 and so on. The returned substring contains |
| 2004 | * those characters for which the position of the character is greater than |
| 2005 | * or equal to the second argument and, if the third argument is specified, |
| 2006 | * less than the sum of the second and third arguments; the comparisons |
| 2007 | * and addition used for the above follow the standard IEEE 754 rules. Thus: |
| 2008 | * - substring("12345", 1.5, 2.6) returns "234" |
| 2009 | * - substring("12345", 0, 3) returns "12" |
| 2010 | * - substring("12345", 0 div 0, 3) returns "" |
| 2011 | * - substring("12345", 1, 0 div 0) returns "" |
| 2012 | * - substring("12345", -42, 1 div 0) returns "12345" |
| 2013 | * - substring("12345", -1 div 0, 1 div 0) returns "" |
| 2014 | */ |
| 2015 | void |
| 2016 | xmlXPathSubstringFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2017 | xmlXPathObjectPtr str, start, len; |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2018 | double le, in; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2019 | int i, l; |
| 2020 | CHAR *ret; |
| 2021 | |
| 2022 | /* |
| 2023 | * Conformance needs to be checked !!!!! |
| 2024 | */ |
| 2025 | if (nargs < 2) { |
| 2026 | CHECK_ARITY(2); |
| 2027 | } |
| 2028 | if (nargs > 3) { |
| 2029 | CHECK_ARITY(3); |
| 2030 | } |
| 2031 | if (nargs == 3) { |
| 2032 | CHECK_TYPE(XPATH_NUMBER); |
| 2033 | len = valuePop(ctxt); |
| 2034 | le = len->floatval; |
| 2035 | xmlXPathFreeObject(len); |
| 2036 | } else { |
| 2037 | le = 2000000000; |
| 2038 | } |
| 2039 | CHECK_TYPE(XPATH_NUMBER); |
| 2040 | start = valuePop(ctxt); |
| 2041 | in = start->floatval; |
| 2042 | xmlXPathFreeObject(start); |
| 2043 | CHECK_TYPE(XPATH_STRING); |
| 2044 | str = valuePop(ctxt); |
| 2045 | le += in; |
| 2046 | |
| 2047 | /* integer index of the first char */ |
| 2048 | i = in; |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2049 | if (((double)i) != in) i++; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2050 | |
| 2051 | /* integer index of the last char */ |
| 2052 | l = le; |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2053 | if (((double)l) != le) l++; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2054 | |
| 2055 | /* back to a zero based len */ |
| 2056 | i--; |
| 2057 | l--; |
| 2058 | |
| 2059 | /* check against the string len */ |
| 2060 | if (l > 1024) { |
| 2061 | l = xmlStrlen(str->stringval); |
| 2062 | } |
| 2063 | if (i < 0) { |
| 2064 | i = 0; |
| 2065 | } |
| 2066 | |
| 2067 | /* number of chars to copy */ |
| 2068 | l -= i; |
| 2069 | |
| 2070 | ret = xmlStrsub(str->stringval, i, l); |
| 2071 | if (ret == NULL) |
| 2072 | valuePush(ctxt, xmlXPathNewString("")); |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2073 | else { |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2074 | valuePush(ctxt, xmlXPathNewString(ret)); |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2075 | free(ret); |
| 2076 | } |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2077 | xmlXPathFreeObject(str); |
| 2078 | } |
| 2079 | |
| 2080 | /** |
| 2081 | * xmlXPathSubstringBeforeFunction: |
| 2082 | * @ctxt: the XPath Parser context |
| 2083 | * |
| 2084 | * Implement the substring-before() XPath function |
| 2085 | * The substring-before function returns the substring of the first |
| 2086 | * argument string that precedes the first occurrence of the second |
| 2087 | * argument string in the first argument string, or the empty string |
| 2088 | * if the first argument string does not contain the second argument |
| 2089 | * string. For example, substring-before("1999/04/01","/") returns 1999. |
| 2090 | */ |
| 2091 | void |
| 2092 | xmlXPathSubstringBeforeFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2093 | CHECK_ARITY(2); |
| 2094 | TODO /* substring before */ |
| 2095 | } |
| 2096 | |
| 2097 | /** |
| 2098 | * xmlXPathSubstringAfterFunction: |
| 2099 | * @ctxt: the XPath Parser context |
| 2100 | * |
| 2101 | * Implement the substring-after() XPath function |
| 2102 | * The substring-after function returns the substring of the first |
| 2103 | * argument string that follows the first occurrence of the second |
| 2104 | * argument string in the first argument string, or the empty stringi |
| 2105 | * if the first argument string does not contain the second argument |
| 2106 | * string. For example, substring-after("1999/04/01","/") returns 04/01, |
| 2107 | * and substring-after("1999/04/01","19") returns 99/04/01. |
| 2108 | */ |
| 2109 | void |
| 2110 | xmlXPathSubstringAfterFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2111 | CHECK_ARITY(2); |
| 2112 | TODO /* substring after */ |
| 2113 | } |
| 2114 | |
| 2115 | /** |
| 2116 | * xmlXPathNormalizeFunction: |
| 2117 | * @ctxt: the XPath Parser context |
| 2118 | * |
| 2119 | * Implement the normalize() XPath function |
| 2120 | * The normalize function returns the argument string with white |
| 2121 | * space normalized by stripping leading and trailing whitespace |
| 2122 | * and replacing sequences of whitespace characters by a single |
| 2123 | * space. Whitespace characters are the same allowed by the S production |
| 2124 | * in XML. If the argument is omitted, it defaults to the context |
| 2125 | * node converted to a string, in other words the value of the context node. |
| 2126 | */ |
| 2127 | void |
| 2128 | xmlXPathNormalizeFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2129 | CHECK_ARITY(1); |
| 2130 | TODO /* normalize isn't as boring as translate, but pretty much */ |
| 2131 | } |
| 2132 | |
| 2133 | /** |
| 2134 | * xmlXPathTranslateFunction: |
| 2135 | * @ctxt: the XPath Parser context |
| 2136 | * |
| 2137 | * Implement the translate() XPath function |
| 2138 | * The translate function returns the first argument string with |
| 2139 | * occurrences of characters in the second argument string replaced |
| 2140 | * by the character at the corresponding position in the third argument |
| 2141 | * string. For example, translate("bar","abc","ABC") returns the string |
| 2142 | * BAr. If there is a character in the second argument string with no |
| 2143 | * character at a corresponding position in the third argument string |
| 2144 | * (because the second argument string is longer than the third argument |
| 2145 | * string), then occurrences of that character in the first argument |
| 2146 | * string are removed. For example, translate("--aaa--","abc-","ABC") |
| 2147 | * returns "AAA". If a character occurs more than once in second |
| 2148 | * argument string, then the first occurrence determines the replacement |
| 2149 | * character. If the third argument string is longer than the second |
| 2150 | * argument string, then excess characters are ignored. |
| 2151 | */ |
| 2152 | void |
| 2153 | xmlXPathTranslateFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2154 | CHECK_ARITY(3); |
| 2155 | TODO /* translate is boring, waiting for UTF-8 representation too */ |
| 2156 | } |
| 2157 | |
| 2158 | /** |
| 2159 | * xmlXPathBooleanFunction: |
| 2160 | * @ctxt: the XPath Parser context |
| 2161 | * |
| 2162 | * Implement the boolean() XPath function |
| 2163 | * he boolean function converts its argument to a boolean as follows: |
| 2164 | * - a number is true if and only if it is neither positive or |
| 2165 | * negative zero nor NaN |
| 2166 | * - a node-set is true if and only if it is non-empty |
| 2167 | * - a string is true if and only if its length is non-zero |
| 2168 | */ |
| 2169 | void |
| 2170 | xmlXPathBooleanFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2171 | xmlXPathObjectPtr cur; |
| 2172 | int res = 0; |
| 2173 | |
| 2174 | CHECK_ARITY(1); |
| 2175 | cur = valuePop(ctxt); |
| 2176 | if (cur == NULL) ERROR(XPATH_INVALID_OPERAND); |
| 2177 | switch (cur->type) { |
| 2178 | case XPATH_NODESET: |
| 2179 | if ((cur->nodesetval == NULL) || |
| 2180 | (cur->nodesetval->nodeNr == 0)) res = 0; |
| 2181 | else |
| 2182 | res = 1; |
| 2183 | break; |
| 2184 | case XPATH_STRING: |
| 2185 | if ((cur->stringval == NULL) || |
| 2186 | (cur->stringval[0] == 0)) res = 0; |
| 2187 | else |
| 2188 | res = 1; |
| 2189 | break; |
| 2190 | case XPATH_BOOLEAN: |
| 2191 | valuePush(ctxt, cur); |
| 2192 | return; |
| 2193 | case XPATH_NUMBER: |
| 2194 | if (cur->floatval) res = 1; |
| 2195 | break; |
| 2196 | default: |
| 2197 | STRANGE |
| 2198 | } |
| 2199 | xmlXPathFreeObject(cur); |
| 2200 | valuePush(ctxt, xmlXPathNewBoolean(res)); |
| 2201 | } |
| 2202 | |
| 2203 | /** |
| 2204 | * xmlXPathNotFunction: |
| 2205 | * @ctxt: the XPath Parser context |
| 2206 | * |
| 2207 | * Implement the not() XPath function |
| 2208 | * The not function returns true if its argument is false, |
| 2209 | * and false otherwise. |
| 2210 | */ |
| 2211 | void |
| 2212 | xmlXPathNotFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2213 | CHECK_ARITY(1); |
| 2214 | CHECK_TYPE(XPATH_BOOLEAN); |
| 2215 | ctxt->value->boolval = ! ctxt->value->boolval; |
| 2216 | } |
| 2217 | |
| 2218 | /** |
| 2219 | * xmlXPathTrueFunction: |
| 2220 | * @ctxt: the XPath Parser context |
| 2221 | * |
| 2222 | * Implement the true() XPath function |
| 2223 | */ |
| 2224 | void |
| 2225 | xmlXPathTrueFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2226 | CHECK_ARITY(0); |
| 2227 | valuePush(ctxt, xmlXPathNewBoolean(1)); |
| 2228 | } |
| 2229 | |
| 2230 | /** |
| 2231 | * xmlXPathFalseFunction: |
| 2232 | * @ctxt: the XPath Parser context |
| 2233 | * |
| 2234 | * Implement the false() XPath function |
| 2235 | */ |
| 2236 | void |
| 2237 | xmlXPathFalseFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2238 | CHECK_ARITY(0); |
| 2239 | valuePush(ctxt, xmlXPathNewBoolean(0)); |
| 2240 | } |
| 2241 | |
| 2242 | /** |
| 2243 | * xmlXPathLangFunction: |
| 2244 | * @ctxt: the XPath Parser context |
| 2245 | * |
| 2246 | * Implement the lang() XPath function |
| 2247 | * The lang function returns true or false depending on whether the |
| 2248 | * language of the context node as specified by xml:lang attributes |
| 2249 | * is the same as or is a sublanguage of the language specified by |
| 2250 | * the argument string. The language of the context node is determined |
| 2251 | * by the value of the xml:lang attribute on the context node, or, if |
| 2252 | * the context node has no xml:lang attribute, by the value of the |
| 2253 | * xml:lang attribute on the nearest ancestor of the context node that |
| 2254 | * has an xml:lang attribute. If there is no such attribute, then lang |
| 2255 | * returns false. If there is such an attribute, then lang returns |
| 2256 | * true if the attribute value is equal to the argument ignoring case, |
| 2257 | * or if there is some suffix starting with - such that the attribute |
| 2258 | * value is equal to the argument ignoring that suffix of the attribute |
| 2259 | * value and ignoring case. |
| 2260 | */ |
| 2261 | void |
| 2262 | xmlXPathLangFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2263 | CHECK_ARITY(0); |
| 2264 | TODO /* Write down xml:lang support in libxml first */ |
| 2265 | } |
| 2266 | |
| 2267 | /** |
| 2268 | * xmlXPathNumberFunction: |
| 2269 | * @ctxt: the XPath Parser context |
| 2270 | * |
| 2271 | * Implement the number() XPath function |
| 2272 | */ |
| 2273 | void |
| 2274 | xmlXPathNumberFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2275 | xmlXPathObjectPtr cur; |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2276 | double res; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2277 | |
| 2278 | CHECK_ARITY(1); |
| 2279 | cur = valuePop(ctxt); |
| 2280 | switch (cur->type) { |
| 2281 | case XPATH_NODESET: |
| 2282 | valuePush(ctxt, cur); |
| 2283 | xmlXPathStringFunction(ctxt, 1); |
| 2284 | cur = valuePop(ctxt); |
| 2285 | case XPATH_STRING: |
| 2286 | res = xmlXPathStringEvalNumber(cur->stringval); |
| 2287 | valuePush(ctxt, xmlXPathNewFloat(res)); |
| 2288 | xmlXPathFreeObject(cur); |
| 2289 | return; |
| 2290 | case XPATH_BOOLEAN: |
| 2291 | if (cur->boolval) valuePush(ctxt, xmlXPathNewFloat(1.0)); |
| 2292 | else valuePush(ctxt, xmlXPathNewFloat(0.0)); |
| 2293 | xmlXPathFreeObject(cur); |
| 2294 | return; |
| 2295 | case XPATH_NUMBER: |
| 2296 | valuePush(ctxt, cur); |
| 2297 | return; |
| 2298 | } |
| 2299 | STRANGE |
| 2300 | } |
| 2301 | |
| 2302 | /** |
| 2303 | * xmlXPathSumFunction: |
| 2304 | * @ctxt: the XPath Parser context |
| 2305 | * |
| 2306 | * Implement the sum() XPath function |
| 2307 | * The sum function returns the sum of the values of the nodes in |
| 2308 | * the argument node-set. |
| 2309 | */ |
| 2310 | void |
| 2311 | xmlXPathSumFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2312 | CHECK_ARITY(1); |
| 2313 | TODO /* BUG Sum : don't understand the definition */ |
| 2314 | } |
| 2315 | |
| 2316 | /** |
| 2317 | * xmlXPathFloorFunction: |
| 2318 | * @ctxt: the XPath Parser context |
| 2319 | * |
| 2320 | * Implement the floor() XPath function |
| 2321 | * The floor function returns the largest (closest to positive infinity) |
| 2322 | * number that is not greater than the argument and that is an integer. |
| 2323 | */ |
| 2324 | void |
| 2325 | xmlXPathFloorFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
| 2326 | CHECK_ARITY(1); |
| 2327 | CHECK_TYPE(XPATH_NUMBER); |
| 2328 | /* floor(0.999999999999) => 1.0 !!!!!!!!!!! */ |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2329 | ctxt->value->floatval = (double)((int) ctxt->value->floatval); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2330 | } |
| 2331 | |
| 2332 | /** |
| 2333 | * xmlXPathCeilingFunction: |
| 2334 | * @ctxt: the XPath Parser context |
| 2335 | * |
| 2336 | * Implement the ceiling() XPath function |
| 2337 | * The ceiling function returns the smallest (closest to negative infinity) |
| 2338 | * number that is not less than the argument and that is an integer. |
| 2339 | */ |
| 2340 | void |
| 2341 | xmlXPathCeilingFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2342 | double f; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2343 | |
| 2344 | CHECK_ARITY(1); |
| 2345 | CHECK_TYPE(XPATH_NUMBER); |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2346 | f = (double)((int) ctxt->value->floatval); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2347 | if (f != ctxt->value->floatval) |
| 2348 | ctxt->value->floatval = f + 1; |
| 2349 | } |
| 2350 | |
| 2351 | /** |
| 2352 | * xmlXPathRoundFunction: |
| 2353 | * @ctxt: the XPath Parser context |
| 2354 | * |
| 2355 | * Implement the round() XPath function |
| 2356 | * The round function returns the number that is closest to the |
| 2357 | * argument and that is an integer. If there are two such numbers, |
| 2358 | * then the one that is even is returned. |
| 2359 | */ |
| 2360 | void |
| 2361 | xmlXPathRoundFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2362 | double f; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2363 | |
| 2364 | CHECK_ARITY(1); |
| 2365 | CHECK_TYPE(XPATH_NUMBER); |
| 2366 | /* round(0.50000001) => 0 !!!!! */ |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2367 | f = (double)((int) ctxt->value->floatval); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2368 | if (ctxt->value->floatval < f + 0.5) |
| 2369 | ctxt->value->floatval = f; |
| 2370 | else if (ctxt->value->floatval == f + 0.5) |
| 2371 | ctxt->value->floatval = f; /* !!!! Not following the spec here */ |
| 2372 | else |
| 2373 | ctxt->value->floatval = f + 1; |
| 2374 | } |
| 2375 | |
| 2376 | /************************************************************************ |
| 2377 | * * |
| 2378 | * The Parser * |
| 2379 | * * |
| 2380 | ************************************************************************/ |
| 2381 | |
| 2382 | /* |
| 2383 | * a couple of forward declarations since we use a recursive call based |
| 2384 | * implementation. |
| 2385 | */ |
| 2386 | void xmlXPathEvalExpr(xmlXPathParserContextPtr ctxt); |
| 2387 | void xmlXPathEvalPredicate(xmlXPathParserContextPtr ctxt); |
| 2388 | void xmlXPathEvalLocationPath(xmlXPathParserContextPtr ctxt); |
| 2389 | void xmlXPathEvalRelativeLocationPath(xmlXPathParserContextPtr ctxt); |
| 2390 | |
| 2391 | /** |
| 2392 | * xmlXPathParseNCName: |
| 2393 | * @ctxt: the XPath Parser context |
| 2394 | * |
| 2395 | * parse an XML namespace non qualified name. |
| 2396 | * |
| 2397 | * [NS 3] NCName ::= (Letter | '_') (NCNameChar)* |
| 2398 | * |
| 2399 | * [NS 4] NCNameChar ::= Letter | Digit | '.' | '-' | '_' | |
| 2400 | * CombiningChar | Extender |
| 2401 | * |
| 2402 | * Returns the namespace name or NULL |
| 2403 | */ |
| 2404 | |
| 2405 | CHAR * |
| 2406 | xmlXPathParseNCName(xmlXPathParserContextPtr ctxt) { |
| 2407 | const CHAR *q; |
| 2408 | CHAR *ret = NULL; |
| 2409 | |
| 2410 | if (!IS_LETTER(CUR) && (CUR != '_')) return(NULL); |
| 2411 | q = NEXT; |
| 2412 | |
| 2413 | while ((IS_LETTER(CUR)) || (IS_DIGIT(CUR)) || |
| 2414 | (CUR == '.') || (CUR == '-') || |
| 2415 | (CUR == '_') || |
| 2416 | (IS_COMBINING(CUR)) || |
| 2417 | (IS_EXTENDER(CUR))) |
| 2418 | NEXT; |
| 2419 | |
| 2420 | ret = xmlStrndup(q, CUR_PTR - q); |
| 2421 | |
| 2422 | return(ret); |
| 2423 | } |
| 2424 | |
| 2425 | /** |
| 2426 | * xmlXPathParseQName: |
| 2427 | * @ctxt: the XPath Parser context |
| 2428 | * @prefix: a CHAR ** |
| 2429 | * |
| 2430 | * parse an XML qualified name |
| 2431 | * |
| 2432 | * [NS 5] QName ::= (Prefix ':')? LocalPart |
| 2433 | * |
| 2434 | * [NS 6] Prefix ::= NCName |
| 2435 | * |
| 2436 | * [NS 7] LocalPart ::= NCName |
| 2437 | * |
| 2438 | * Returns the function returns the local part, and prefix is updated |
| 2439 | * to get the Prefix if any. |
| 2440 | */ |
| 2441 | |
| 2442 | CHAR * |
| 2443 | xmlXPathParseQName(xmlXPathParserContextPtr ctxt, CHAR **prefix) { |
| 2444 | CHAR *ret = NULL; |
| 2445 | |
| 2446 | *prefix = NULL; |
| 2447 | ret = xmlXPathParseNCName(ctxt); |
| 2448 | if (CUR == ':') { |
| 2449 | *prefix = ret; |
| 2450 | NEXT; |
| 2451 | ret = xmlXPathParseNCName(ctxt); |
| 2452 | } |
| 2453 | return(ret); |
| 2454 | } |
| 2455 | |
| 2456 | /** |
| 2457 | * xmlXPathStringEvalNumber: |
| 2458 | * @str: A string to scan |
| 2459 | * |
| 2460 | * [30] Number ::= Digits ('.' Digits)? |
| 2461 | * | '.' Digits |
| 2462 | * [31] Digits ::= [0-9]+ |
| 2463 | * |
| 2464 | * Parse and evaluate a Number in the string |
| 2465 | * |
| 2466 | * BUG: "1.' is not valid ... James promised correction |
| 2467 | * as Digits ('.' Digits?)? |
| 2468 | * |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2469 | * Returns the double value. |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2470 | */ |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2471 | double |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2472 | xmlXPathStringEvalNumber(const CHAR *str) { |
| 2473 | const CHAR *cur = str; |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2474 | double ret = 0.0; |
| 2475 | double mult = 1; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2476 | int ok = 0; |
| 2477 | |
| 2478 | while (*cur == ' ') cur++; |
| 2479 | if ((*cur != '.') && ((*cur < '0') || (*cur > '9'))) { |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2480 | return(xmlXPathNAN); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2481 | } |
| 2482 | while ((*cur >= '0') && (*cur <= '9')) { |
| 2483 | ret = ret * 10 + (*cur - '0'); |
| 2484 | ok = 1; |
| 2485 | cur++; |
| 2486 | } |
| 2487 | if (*cur == '.') { |
| 2488 | cur++; |
| 2489 | if (((*cur < '0') || (*cur > '9')) && (!ok)) { |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2490 | return(xmlXPathNAN); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2491 | } |
| 2492 | while ((*cur >= '0') && (*cur <= '9')) { |
| 2493 | mult /= 10; |
| 2494 | ret = ret + (*cur - '0') * mult; |
| 2495 | cur++; |
| 2496 | } |
| 2497 | } |
| 2498 | while (*cur == ' ') cur++; |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2499 | if (*cur != 0) return(xmlXPathNAN); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2500 | return(ret); |
| 2501 | } |
| 2502 | |
| 2503 | /** |
| 2504 | * xmlXPathEvalNumber: |
| 2505 | * @ctxt: the XPath Parser context |
| 2506 | * |
| 2507 | * [30] Number ::= Digits ('.' Digits)? |
| 2508 | * | '.' Digits |
| 2509 | * [31] Digits ::= [0-9]+ |
| 2510 | * |
| 2511 | * Parse and evaluate a Number, then push it on the stack |
| 2512 | * |
| 2513 | * BUG: "1.' is not valid ... James promised correction |
| 2514 | * as Digits ('.' Digits?)? |
| 2515 | */ |
| 2516 | void |
| 2517 | xmlXPathEvalNumber(xmlXPathParserContextPtr ctxt) { |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2518 | double ret = 0.0; |
| 2519 | double mult = 1; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2520 | int ok = 0; |
| 2521 | |
| 2522 | CHECK_ERROR; |
| 2523 | if ((CUR != '.') && ((CUR < '0') || (CUR > '9'))) { |
| 2524 | ERROR(XPATH_NUMBER_ERROR); |
| 2525 | } |
| 2526 | while ((CUR >= '0') && (CUR <= '9')) { |
| 2527 | ret = ret * 10 + (CUR - '0'); |
| 2528 | ok = 1; |
| 2529 | NEXT; |
| 2530 | } |
| 2531 | if (CUR == '.') { |
| 2532 | NEXT; |
| 2533 | if (((CUR < '0') || (CUR > '9')) && (!ok)) { |
| 2534 | ERROR(XPATH_NUMBER_ERROR); |
| 2535 | } |
| 2536 | while ((CUR >= '0') && (CUR <= '9')) { |
| 2537 | mult /= 10; |
| 2538 | ret = ret + (CUR - '0') * mult; |
| 2539 | NEXT; |
| 2540 | } |
| 2541 | } |
| 2542 | valuePush(ctxt, xmlXPathNewFloat(ret)); |
| 2543 | } |
| 2544 | |
| 2545 | /** |
| 2546 | * xmlXPathEvalLiteral: |
| 2547 | * @ctxt: the XPath Parser context |
| 2548 | * |
| 2549 | * Parse a Literal and push it on the stack. |
| 2550 | * |
| 2551 | * [29] Literal ::= '"' [^"]* '"' |
| 2552 | * | "'" [^']* "'" |
| 2553 | * |
| 2554 | * TODO: memory allocation could be improved. |
| 2555 | */ |
| 2556 | void |
| 2557 | xmlXPathEvalLiteral(xmlXPathParserContextPtr ctxt) { |
| 2558 | const CHAR *q; |
| 2559 | CHAR *ret = NULL; |
| 2560 | |
| 2561 | if (CUR == '"') { |
| 2562 | NEXT; |
| 2563 | q = CUR_PTR; |
| 2564 | while ((IS_CHAR(CUR)) && (CUR != '"')) |
| 2565 | NEXT; |
| 2566 | if (!IS_CHAR(CUR)) { |
| 2567 | ERROR(XPATH_UNFINISHED_LITERAL_ERROR); |
| 2568 | } else { |
| 2569 | ret = xmlStrndup(q, CUR_PTR - q); |
| 2570 | NEXT; |
| 2571 | } |
| 2572 | } else if (CUR == '\'') { |
| 2573 | NEXT; |
| 2574 | q = CUR_PTR; |
| 2575 | while ((IS_CHAR(CUR)) && (CUR != '\'')) |
| 2576 | NEXT; |
| 2577 | if (!IS_CHAR(CUR)) { |
| 2578 | ERROR(XPATH_UNFINISHED_LITERAL_ERROR); |
| 2579 | } else { |
| 2580 | ret = xmlStrndup(q, CUR_PTR - q); |
| 2581 | NEXT; |
| 2582 | } |
| 2583 | } else { |
| 2584 | ERROR(XPATH_START_LITERAL_ERROR); |
| 2585 | } |
| 2586 | if (ret == NULL) return; |
| 2587 | valuePush(ctxt, xmlXPathNewString(ret)); |
| 2588 | free(ret); |
| 2589 | } |
| 2590 | |
| 2591 | /** |
| 2592 | * xmlXPathEvalVariableReference: |
| 2593 | * @ctxt: the XPath Parser context |
| 2594 | * |
| 2595 | * Parse a VariableReference, evaluate it and push it on the stack. |
| 2596 | * |
| 2597 | * The variable bindings consist of a mapping from variable names |
| 2598 | * to variable values. The value of a variable is an object, which |
| 2599 | * of any of the types that are possible for the value of an expression, |
| 2600 | * and may also be of additional types not specified here. |
| 2601 | * |
| 2602 | * Early evaluation is possible since: |
| 2603 | * The variable bindings [...] used to evaluate a subexpression are |
| 2604 | * always the same as those used to evaluate the containing expression. |
| 2605 | * |
| 2606 | * [36] VariableReference ::= '$' QName |
| 2607 | */ |
| 2608 | void |
| 2609 | xmlXPathEvalVariableReference(xmlXPathParserContextPtr ctxt) { |
| 2610 | CHAR *name; |
| 2611 | CHAR *prefix; |
| 2612 | xmlXPathObjectPtr value; |
| 2613 | |
| 2614 | if (CUR != '$') { |
| 2615 | ERROR(XPATH_VARIABLE_REF_ERROR); |
| 2616 | } |
| 2617 | name = xmlXPathParseQName(ctxt, &prefix); |
| 2618 | if (name == NULL) { |
| 2619 | ERROR(XPATH_VARIABLE_REF_ERROR); |
| 2620 | } |
| 2621 | value = xmlXPathVariablelookup(ctxt, prefix, name); |
| 2622 | if (value == NULL) { |
| 2623 | ERROR(XPATH_UNDEF_VARIABLE_ERROR); |
| 2624 | } |
| 2625 | valuePush(ctxt, value); |
| 2626 | if (prefix != NULL) free(prefix); |
| 2627 | free(name); |
| 2628 | } |
| 2629 | |
| 2630 | |
| 2631 | /** |
| 2632 | * xmlXPathFunctionLookup: |
| 2633 | * @ctxt: the XPath Parser context |
| 2634 | * @name: a name string |
| 2635 | * |
| 2636 | * Search for a function of the given name |
| 2637 | * |
| 2638 | * [35] FunctionName ::= QName - NodeType |
| 2639 | * |
| 2640 | * TODO: for the moment the list is hardcoded from the spec !!!! |
| 2641 | * |
| 2642 | * Returns the xmlXPathFunction if found, or NULL otherwise |
| 2643 | */ |
| 2644 | xmlXPathFunction |
| 2645 | xmlXPathIsFunction(xmlXPathParserContextPtr ctxt, CHAR *name) { |
| 2646 | switch (name[0]) { |
| 2647 | case 'b': |
| 2648 | if (!xmlStrcmp(name, "boolean")) |
| 2649 | return(xmlXPathBooleanFunction); |
| 2650 | break; |
| 2651 | case 'c': |
| 2652 | if (!xmlStrcmp(name, "ceiling")) |
| 2653 | return(xmlXPathCeilingFunction); |
| 2654 | if (!xmlStrcmp(name, "count")) |
| 2655 | return(xmlXPathCountFunction); |
| 2656 | if (!xmlStrcmp(name, "concat")) |
| 2657 | return(xmlXPathConcatFunction); |
| 2658 | if (!xmlStrcmp(name, "contains")) |
| 2659 | return(xmlXPathContainsFunction); |
| 2660 | break; |
| 2661 | case 'i': |
| 2662 | if (!xmlStrcmp(name, "id")) |
| 2663 | return(xmlXPathIdFunction); |
| 2664 | break; |
| 2665 | case 'f': |
| 2666 | if (!xmlStrcmp(name, "false")) |
| 2667 | return(xmlXPathFalseFunction); |
| 2668 | if (!xmlStrcmp(name, "floor")) |
| 2669 | return(xmlXPathFloorFunction); |
| 2670 | break; |
| 2671 | case 'l': |
| 2672 | if (!xmlStrcmp(name, "last")) |
| 2673 | return(xmlXPathLastFunction); |
| 2674 | if (!xmlStrcmp(name, "lang")) |
| 2675 | return(xmlXPathLangFunction); |
| 2676 | if (!xmlStrcmp(name, "local-part")) |
| 2677 | return(xmlXPathLocalPartFunction); |
| 2678 | break; |
| 2679 | case 'n': |
| 2680 | if (!xmlStrcmp(name, "not")) |
| 2681 | return(xmlXPathNotFunction); |
| 2682 | if (!xmlStrcmp(name, "name")) |
| 2683 | return(xmlXPathNameFunction); |
| 2684 | if (!xmlStrcmp(name, "namespace")) |
| 2685 | return(xmlXPathNamespaceFunction); |
| 2686 | if (!xmlStrcmp(name, "normalize")) |
| 2687 | return(xmlXPathNormalizeFunction); |
| 2688 | if (!xmlStrcmp(name, "number")) |
| 2689 | return(xmlXPathNumberFunction); |
| 2690 | break; |
| 2691 | case 'p': |
| 2692 | if (!xmlStrcmp(name, "position")) |
| 2693 | return(xmlXPathPositionFunction); |
| 2694 | break; |
| 2695 | case 'r': |
| 2696 | if (!xmlStrcmp(name, "round")) |
| 2697 | return(xmlXPathRoundFunction); |
| 2698 | break; |
| 2699 | case 's': |
| 2700 | if (!xmlStrcmp(name, "string")) |
| 2701 | return(xmlXPathStringFunction); |
| 2702 | if (!xmlStrcmp(name, "string-length")) |
| 2703 | return(xmlXPathStringLengthFunction); |
| 2704 | if (!xmlStrcmp(name, "starts-with")) |
| 2705 | return(xmlXPathStartsWithFunction); |
| 2706 | if (!xmlStrcmp(name, "substring")) |
| 2707 | return(xmlXPathSubstringFunction); |
| 2708 | if (!xmlStrcmp(name, "substring-before")) |
| 2709 | return(xmlXPathSubstringBeforeFunction); |
| 2710 | if (!xmlStrcmp(name, "substring-after")) |
| 2711 | return(xmlXPathSubstringAfterFunction); |
| 2712 | if (!xmlStrcmp(name, "sum")) |
| 2713 | return(xmlXPathSumFunction); |
| 2714 | break; |
| 2715 | case 't': |
| 2716 | if (!xmlStrcmp(name, "true")) |
| 2717 | return(xmlXPathTrueFunction); |
| 2718 | if (!xmlStrcmp(name, "translate")) |
| 2719 | return(xmlXPathTranslateFunction); |
| 2720 | break; |
| 2721 | } |
| 2722 | return(NULL); |
| 2723 | } |
| 2724 | |
| 2725 | /** |
| 2726 | * xmlXPathEvalLocationPathName: |
| 2727 | * @ctxt: the XPath Parser context |
| 2728 | * @name: a name string |
| 2729 | * |
| 2730 | * Various names in the beginning of a LocationPath expression |
| 2731 | * indicate whether that's an Axis, a node type, |
| 2732 | * |
| 2733 | * [6] AxisName ::= 'ancestor' |
| 2734 | * | 'ancestor-or-self' |
| 2735 | * | 'attribute' |
| 2736 | * | 'child' |
| 2737 | * | 'descendant' |
| 2738 | * | 'descendant-or-self' |
| 2739 | * | 'following' |
| 2740 | * | 'following-sibling' |
| 2741 | * | 'namespace' |
| 2742 | * | 'parent' |
| 2743 | * | 'preceding' |
| 2744 | * | 'preceding-sibling' |
| 2745 | * | 'self' |
| 2746 | * [38] NodeType ::= 'comment' |
| 2747 | * | 'text' |
| 2748 | * | 'processing-instruction' |
| 2749 | * | 'node' |
| 2750 | */ |
| 2751 | int |
| 2752 | xmlXPathGetNameType(xmlXPathParserContextPtr ctxt, CHAR *name) { |
| 2753 | switch (name[0]) { |
| 2754 | case 'a': |
| 2755 | if (!xmlStrcmp(name, "ancestor")) return(AXIS_ANCESTOR); |
| 2756 | if (!xmlStrcmp(name, "ancestor-or-self")) return(AXIS_ANCESTOR_OR_SELF); |
| 2757 | if (!xmlStrcmp(name, "attribute")) return(AXIS_ATTRIBUTE); |
| 2758 | break; |
| 2759 | case 'c': |
| 2760 | if (!xmlStrcmp(name, "child")) return(AXIS_CHILD); |
| 2761 | if (!xmlStrcmp(name, "comment")) return(NODE_TYPE_COMMENT); |
| 2762 | break; |
| 2763 | case 'd': |
| 2764 | if (!xmlStrcmp(name, "descendant")) return(AXIS_DESCENDANT); |
| 2765 | if (!xmlStrcmp(name, "descendant-or-self")) return(AXIS_DESCENDANT_OR_SELF); |
| 2766 | break; |
| 2767 | case 'f': |
| 2768 | if (!xmlStrcmp(name, "following")) return(AXIS_FOLLOWING); |
| 2769 | if (!xmlStrcmp(name, "following-sibling")) return(AXIS_FOLLOWING_SIBLING); |
| 2770 | break; |
| 2771 | case 'n': |
| 2772 | if (!xmlStrcmp(name, "namespace")) return(AXIS_NAMESPACE); |
| 2773 | if (!xmlStrcmp(name, "node")) return(NODE_TYPE_NODE); |
| 2774 | break; |
| 2775 | case 'p': |
| 2776 | if (!xmlStrcmp(name, "parent")) return(AXIS_PARENT); |
| 2777 | if (!xmlStrcmp(name, "preceding")) return(AXIS_PRECEDING); |
| 2778 | if (!xmlStrcmp(name, "preceding-sibling")) return(AXIS_PRECEDING_SIBLING); |
| 2779 | if (!xmlStrcmp(name, "processing-instruction")) return(NODE_TYPE_PI); |
| 2780 | break; |
| 2781 | case 's': |
| 2782 | if (!xmlStrcmp(name, "self")) return(AXIS_SELF); |
| 2783 | break; |
| 2784 | case 't': |
| 2785 | if (!xmlStrcmp(name, "text")) return(NODE_TYPE_TEXT); |
| 2786 | break; |
| 2787 | } |
| 2788 | if (xmlXPathIsFunction(ctxt, name)) return(IS_FUNCTION); |
| 2789 | return(0); |
| 2790 | } |
| 2791 | |
| 2792 | /** |
| 2793 | * xmlXPathEvalFunctionCall: |
| 2794 | * @ctxt: the XPath Parser context |
| 2795 | * |
| 2796 | * [16] FunctionCall ::= FunctionName '(' ( Argument ( ',' Argument)*)? ')' |
| 2797 | * [17] Argument ::= Expr |
| 2798 | * |
| 2799 | * Parse and evaluate a function call, the evaluation of all arguments are |
| 2800 | * pushed on the stack |
| 2801 | */ |
| 2802 | void |
| 2803 | xmlXPathEvalFunctionCall(xmlXPathParserContextPtr ctxt) { |
| 2804 | CHAR *name; |
| 2805 | CHAR *prefix; |
| 2806 | xmlXPathFunction func; |
| 2807 | int nbargs = 0; |
| 2808 | |
| 2809 | name = xmlXPathParseQName(ctxt, &prefix); |
| 2810 | if (name == NULL) { |
| 2811 | ERROR(XPATH_EXPR_ERROR); |
| 2812 | } |
| 2813 | func = xmlXPathIsFunction(ctxt, name); |
| 2814 | if (func == NULL) { |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2815 | free(name); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2816 | ERROR(XPATH_UNKNOWN_FUNC_ERROR); |
| 2817 | } |
| 2818 | #ifdef DEBUG_EXPR |
| 2819 | fprintf(xmlXPathDebug, "Calling function %s\n", name); |
| 2820 | #endif |
| 2821 | |
| 2822 | if (CUR != '(') { |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2823 | free(name); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2824 | ERROR(XPATH_EXPR_ERROR); |
| 2825 | } |
| 2826 | NEXT; |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2827 | |
| 2828 | while (CUR != ')') { |
| 2829 | xmlXPathEvalExpr(ctxt); |
| 2830 | nbargs++; |
| 2831 | if (CUR == ')') break; |
| 2832 | if (CUR != ',') { |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2833 | free(name); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2834 | ERROR(XPATH_EXPR_ERROR); |
| 2835 | } |
| 2836 | NEXT; |
| 2837 | } |
| 2838 | NEXT; |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 2839 | free(name); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 2840 | func(ctxt, nbargs); |
| 2841 | } |
| 2842 | |
| 2843 | /** |
| 2844 | * xmlXPathEvalPrimaryExpr: |
| 2845 | * @ctxt: the XPath Parser context |
| 2846 | * |
| 2847 | * [15] PrimaryExpr ::= VariableReference |
| 2848 | * | '(' Expr ')' |
| 2849 | * | Literal |
| 2850 | * | Number |
| 2851 | * | FunctionCall |
| 2852 | * |
| 2853 | * Parse and evaluate a primary expression, then push the result on the stack |
| 2854 | */ |
| 2855 | void |
| 2856 | xmlXPathEvalPrimaryExpr(xmlXPathParserContextPtr ctxt) { |
| 2857 | if (CUR == '$') xmlXPathEvalVariableReference(ctxt); |
| 2858 | else if (CUR == '(') { |
| 2859 | NEXT; |
| 2860 | xmlXPathEvalExpr(ctxt); |
| 2861 | if (CUR != ')') { |
| 2862 | ERROR(XPATH_EXPR_ERROR); |
| 2863 | } |
| 2864 | NEXT; |
| 2865 | } else if (IS_DIGIT(CUR)) { |
| 2866 | xmlXPathEvalNumber(ctxt); |
| 2867 | } else if ((CUR == '\'') || (CUR == '"')) { |
| 2868 | xmlXPathEvalLiteral(ctxt); |
| 2869 | } else { |
| 2870 | xmlXPathEvalFunctionCall(ctxt); |
| 2871 | } |
| 2872 | } |
| 2873 | |
| 2874 | /** |
| 2875 | * xmlXPathEvalFilterExpr: |
| 2876 | * @ctxt: the XPath Parser context |
| 2877 | * |
| 2878 | * [20] FilterExpr ::= PrimaryExpr |
| 2879 | * | FilterExpr Predicate |
| 2880 | * |
| 2881 | * Parse and evaluate a filter expression, then push the result on the stack |
| 2882 | * Square brackets are used to filter expressions in the same way that |
| 2883 | * they are used in location paths. It is an error if the expression to |
| 2884 | * be filtered does not evaluate to a node-set. The context node list |
| 2885 | * used for evaluating the expression in square brackets is the node-set |
| 2886 | * to be filtered listed in document order. |
| 2887 | */ |
| 2888 | |
| 2889 | void |
| 2890 | xmlXPathEvalFilterExpr(xmlXPathParserContextPtr ctxt) { |
| 2891 | /**** |
| 2892 | xmlNodeSetPtr oldset = NULL; |
| 2893 | xmlXPathObjectPtr arg; |
| 2894 | ****/ |
| 2895 | |
| 2896 | xmlXPathEvalPrimaryExpr(ctxt); |
| 2897 | CHECK_ERROR; |
| 2898 | |
| 2899 | if (CUR != '[') return; |
| 2900 | |
| 2901 | CHECK_TYPE(XPATH_NODESET); |
| 2902 | |
| 2903 | /****** |
| 2904 | TODO: transition from PathExpr to Expr using paths ... |
| 2905 | arg = valuePop(ctxt); |
| 2906 | oldset = ctxt->context->nodeset; |
| 2907 | ctxt->context->nodeset = arg->nodesetval; |
| 2908 | ******/ |
| 2909 | |
| 2910 | while (CUR == '[') { |
| 2911 | xmlXPathEvalPredicate(ctxt); |
| 2912 | } |
| 2913 | |
| 2914 | |
| 2915 | } |
| 2916 | |
| 2917 | /** |
| 2918 | * xmlXPathEvalPathExpr: |
| 2919 | * @ctxt: the XPath Parser context |
| 2920 | * |
| 2921 | * [19] PathExpr ::= LocationPath |
| 2922 | * | FilterExpr |
| 2923 | * | FilterExpr '/' RelativeLocationPath |
| 2924 | * | FilterExpr '//' RelativeLocationPath |
| 2925 | * |
| 2926 | * Parse and evaluate a path expression, then push the result on the stack |
| 2927 | * The / operator and // operators combine an arbitrary expression |
| 2928 | * and a relative location path. It is an error if the expression |
| 2929 | * does not evaluate to a node-set. |
| 2930 | * The / operator does composition in the same way as when / is |
| 2931 | * used in a location path. As in location paths, // is short for |
| 2932 | * /descendant-or-self::node()/. |
| 2933 | */ |
| 2934 | |
| 2935 | void |
| 2936 | xmlXPathEvalPathExpr(xmlXPathParserContextPtr ctxt) { |
| 2937 | xmlNodeSetPtr newset = NULL; |
| 2938 | |
| 2939 | /* |
| 2940 | * TODO: FilterExpr => PrimaryExpr => FunctionName is possible too |
| 2941 | * so we may have to parse a name here, and depending on whether |
| 2942 | * it's a function name or not parse a FilterExpr or a LocationPath |
| 2943 | * !!!!!!!!!!!! See NOTE1 |
| 2944 | */ |
| 2945 | |
| 2946 | if ((CUR == '$') || (CUR == '(') || (IS_DIGIT(CUR)) || |
| 2947 | (CUR == '\'') || (CUR == '"')) { |
| 2948 | xmlXPathEvalFilterExpr(ctxt); |
| 2949 | CHECK_ERROR; |
| 2950 | if ((CUR == '/') && (NXT(1) == '/')) { |
| 2951 | SKIP(2); |
| 2952 | if (ctxt->context->nodelist == NULL) { |
| 2953 | STRANGE |
| 2954 | xmlXPathRoot(ctxt); |
| 2955 | } |
| 2956 | newset = xmlXPathNodeCollectAndTest(ctxt, AXIS_DESCENDANT_OR_SELF, |
| 2957 | NODE_TEST_TYPE, XML_ELEMENT_NODE, NULL, NULL); |
| 2958 | if (ctxt->context->nodelist != NULL) |
| 2959 | xmlXPathFreeNodeSet(ctxt->context->nodelist); |
| 2960 | ctxt->context->nodelist = newset; |
| 2961 | ctxt->context->node = NULL; |
| 2962 | xmlXPathEvalRelativeLocationPath(ctxt); |
| 2963 | } else if (CUR == '/') { |
| 2964 | xmlXPathEvalRelativeLocationPath(ctxt); |
| 2965 | } |
| 2966 | } else { |
| 2967 | xmlXPathEvalLocationPath(ctxt); |
| 2968 | } |
| 2969 | } |
| 2970 | |
| 2971 | /** |
| 2972 | * xmlXPathEvalUnionExpr: |
| 2973 | * @ctxt: the XPath Parser context |
| 2974 | * |
| 2975 | * [18] UnionExpr ::= PathExpr |
| 2976 | * | UnionExpr '|' PathExpr |
| 2977 | * |
| 2978 | * Parse and evaluate an union expression, then push the result on the stack |
| 2979 | */ |
| 2980 | |
| 2981 | void |
| 2982 | xmlXPathEvalUnionExpr(xmlXPathParserContextPtr ctxt) { |
| 2983 | xmlXPathEvalPathExpr(ctxt); |
| 2984 | CHECK_ERROR; |
| 2985 | if (CUR == '|') { |
| 2986 | xmlNodeSetPtr old = ctxt->context->nodelist; |
| 2987 | |
| 2988 | xmlXPathEvalPathExpr(ctxt); |
| 2989 | |
| 2990 | if (ctxt->context->nodelist == NULL) |
| 2991 | ctxt->context->nodelist = old; |
| 2992 | else { |
| 2993 | ctxt->context->nodelist = |
| 2994 | xmlXPathNodeSetMerge(ctxt->context->nodelist, old); |
| 2995 | xmlXPathFreeNodeSet(old); |
| 2996 | } |
| 2997 | } |
| 2998 | } |
| 2999 | |
| 3000 | /** |
| 3001 | * xmlXPathEvalUnaryExpr: |
| 3002 | * @ctxt: the XPath Parser context |
| 3003 | * |
| 3004 | * [27] UnaryExpr ::= UnionExpr |
| 3005 | * | '-' UnaryExpr |
| 3006 | * |
| 3007 | * Parse and evaluate an unary expression, then push the result on the stack |
| 3008 | */ |
| 3009 | |
| 3010 | void |
| 3011 | xmlXPathEvalUnaryExpr(xmlXPathParserContextPtr ctxt) { |
| 3012 | int minus = 0; |
| 3013 | |
| 3014 | if (CUR == '-') { |
| 3015 | minus = 1; |
| 3016 | NEXT; |
| 3017 | } |
| 3018 | /* xmlXPathEvalUnionExpr(ctxt); NOTE1 !!! */ |
| 3019 | xmlXPathEvalPrimaryExpr(ctxt); |
| 3020 | CHECK_ERROR; |
| 3021 | if (minus) { |
| 3022 | xmlXPathValueFlipSign(ctxt); |
| 3023 | } |
| 3024 | } |
| 3025 | |
| 3026 | /** |
| 3027 | * xmlXPathEvalMultiplicativeExpr: |
| 3028 | * @ctxt: the XPath Parser context |
| 3029 | * |
| 3030 | * [26] MultiplicativeExpr ::= UnaryExpr |
| 3031 | * | MultiplicativeExpr MultiplyOperator UnaryExpr |
| 3032 | * | MultiplicativeExpr 'div' UnaryExpr |
| 3033 | * | MultiplicativeExpr 'mod' UnaryExpr |
| 3034 | * [34] MultiplyOperator ::= '*' |
| 3035 | * |
| 3036 | * Parse and evaluate an Additive expression, then push the result on the stack |
| 3037 | */ |
| 3038 | |
| 3039 | void |
| 3040 | xmlXPathEvalMultiplicativeExpr(xmlXPathParserContextPtr ctxt) { |
| 3041 | xmlXPathEvalUnaryExpr(ctxt); |
| 3042 | CHECK_ERROR; |
| 3043 | while ((CUR == '*') || |
| 3044 | ((CUR == 'd') && (NXT(1) == 'i') && (NXT(2) == 'v')) || |
| 3045 | ((CUR == 'm') && (NXT(1) == 'o') && (NXT(2) == 'd'))) { |
| 3046 | int op = -1; |
| 3047 | |
| 3048 | if (CUR == '*') { |
| 3049 | op = 0; |
| 3050 | NEXT; |
| 3051 | } else if (CUR == 'd') { |
| 3052 | op = 1; |
| 3053 | SKIP(3); |
| 3054 | } else if (CUR == 'm') { |
| 3055 | op = 2; |
| 3056 | SKIP(3); |
| 3057 | } |
| 3058 | xmlXPathEvalUnaryExpr(ctxt); |
| 3059 | CHECK_ERROR; |
| 3060 | switch (op) { |
| 3061 | case 0: |
| 3062 | xmlXPathMultValues(ctxt); |
| 3063 | break; |
| 3064 | case 1: |
| 3065 | xmlXPathDivValues(ctxt); |
| 3066 | break; |
| 3067 | case 2: |
| 3068 | xmlXPathModValues(ctxt); |
| 3069 | break; |
| 3070 | } |
| 3071 | } |
| 3072 | } |
| 3073 | |
| 3074 | /** |
| 3075 | * xmlXPathEvalAdditiveExpr: |
| 3076 | * @ctxt: the XPath Parser context |
| 3077 | * |
| 3078 | * [25] AdditiveExpr ::= MultiplicativeExpr |
| 3079 | * | AdditiveExpr '+' MultiplicativeExpr |
| 3080 | * | AdditiveExpr '-' MultiplicativeExpr |
| 3081 | * |
| 3082 | * Parse and evaluate an Additive expression, then push the result on the stack |
| 3083 | */ |
| 3084 | |
| 3085 | void |
| 3086 | xmlXPathEvalAdditiveExpr(xmlXPathParserContextPtr ctxt) { |
| 3087 | xmlXPathEvalMultiplicativeExpr(ctxt); |
| 3088 | CHECK_ERROR; |
| 3089 | while ((CUR == '+') || (CUR == '-')) { |
| 3090 | int plus; |
| 3091 | |
| 3092 | if (CUR == '+') plus = 1; |
| 3093 | else plus = 0; |
| 3094 | NEXT; |
| 3095 | xmlXPathEvalMultiplicativeExpr(ctxt); |
| 3096 | CHECK_ERROR; |
| 3097 | if (plus) xmlXPathAddValues(ctxt); |
| 3098 | else xmlXPathSubValues(ctxt); |
| 3099 | } |
| 3100 | } |
| 3101 | |
| 3102 | /** |
| 3103 | * xmlXPathEvalRelationalExpr: |
| 3104 | * @ctxt: the XPath Parser context |
| 3105 | * |
| 3106 | * [24] RelationalExpr ::= AdditiveExpr |
| 3107 | * | RelationalExpr '<' AdditiveExpr |
| 3108 | * | RelationalExpr '>' AdditiveExpr |
| 3109 | * | RelationalExpr '<=' AdditiveExpr |
| 3110 | * | RelationalExpr '>=' AdditiveExpr |
| 3111 | * |
| 3112 | * A <= B > C is allowed ? Answer from James, yes with |
| 3113 | * (AdditiveExpr <= AdditiveExpr) > AdditiveExpr |
| 3114 | * which is basically what got implemented. |
| 3115 | * |
| 3116 | * Parse and evaluate a Relational expression, then push the result |
| 3117 | * on the stack |
| 3118 | */ |
| 3119 | |
| 3120 | void |
| 3121 | xmlXPathEvalRelationalExpr(xmlXPathParserContextPtr ctxt) { |
| 3122 | xmlXPathEvalAdditiveExpr(ctxt); |
| 3123 | CHECK_ERROR; |
| 3124 | while ((CUR == '<') || |
| 3125 | (CUR == '>') || |
| 3126 | ((CUR == '<') && (NXT(1) == '=')) || |
| 3127 | ((CUR == '>') && (NXT(1) == '='))) { |
| 3128 | xmlXPathObjectPtr arg1, arg2, res; |
| 3129 | int inf, strict, equal; |
| 3130 | |
| 3131 | if (CUR == '<') inf = 1; |
| 3132 | else inf = 0; |
| 3133 | if (NXT(1) == '=') strict = 0; |
| 3134 | else strict = 1; |
| 3135 | NEXT; |
| 3136 | if (!strict) NEXT; |
| 3137 | xmlXPathEvalAdditiveExpr(ctxt); |
| 3138 | CHECK_ERROR; |
| 3139 | arg2 = valuePop(ctxt); |
| 3140 | arg1 = valuePop(ctxt); |
| 3141 | equal = xmlXPathCompareValues(inf, strict, arg1, arg2); |
| 3142 | res = xmlXPathNewBoolean(equal); |
| 3143 | valuePush(ctxt, res); |
| 3144 | xmlXPathFreeObject(arg1); |
| 3145 | xmlXPathFreeObject(arg2); |
| 3146 | } |
| 3147 | } |
| 3148 | |
| 3149 | /** |
| 3150 | * xmlXPathEvalEqualityExpr: |
| 3151 | * @ctxt: the XPath Parser context |
| 3152 | * |
| 3153 | * [23] EqualityExpr ::= RelationalExpr |
| 3154 | * | EqualityExpr '=' RelationalExpr |
| 3155 | * | EqualityExpr '!=' RelationalExpr |
| 3156 | * |
| 3157 | * A != B != C is allowed ? Answer from James, yes with |
| 3158 | * (RelationalExpr = RelationalExpr) = RelationalExpr |
| 3159 | * (RelationalExpr != RelationalExpr) != RelationalExpr |
| 3160 | * which is basically what got implemented. |
| 3161 | * |
| 3162 | * Parse and evaluate an Equality expression, then push the result on the stack |
| 3163 | * |
| 3164 | */ |
| 3165 | void |
| 3166 | xmlXPathEvalEqualityExpr(xmlXPathParserContextPtr ctxt) { |
| 3167 | xmlXPathEvalRelationalExpr(ctxt); |
| 3168 | CHECK_ERROR; |
| 3169 | while ((CUR == '=') || ((CUR == '!') && (NXT(1) == '='))) { |
| 3170 | xmlXPathObjectPtr arg1, arg2, res; |
| 3171 | int eq, equal; |
| 3172 | |
| 3173 | if (CUR == '=') eq = 1; |
| 3174 | else eq = 0; |
| 3175 | NEXT; |
| 3176 | if (!eq) NEXT; |
| 3177 | xmlXPathEvalRelationalExpr(ctxt); |
| 3178 | CHECK_ERROR; |
| 3179 | arg2 = valuePop(ctxt); |
| 3180 | arg1 = valuePop(ctxt); |
| 3181 | equal = xmlXPathEqualValues(arg1, arg2); |
| 3182 | if (eq) res = xmlXPathNewBoolean(equal); |
| 3183 | else res = xmlXPathNewBoolean(!equal); |
| 3184 | valuePush(ctxt, res); |
| 3185 | xmlXPathFreeObject(arg1); |
| 3186 | xmlXPathFreeObject(arg2); |
| 3187 | } |
| 3188 | } |
| 3189 | |
| 3190 | /** |
| 3191 | * xmlXPathEvalAndExpr: |
| 3192 | * @ctxt: the XPath Parser context |
| 3193 | * |
| 3194 | * [22] AndExpr ::= EqualityExpr |
| 3195 | * | AndExpr 'and' EqualityExpr |
| 3196 | * |
| 3197 | * Parse and evaluate an AND expression, then push the result on the stack |
| 3198 | * |
| 3199 | */ |
| 3200 | void |
| 3201 | xmlXPathEvalAndExpr(xmlXPathParserContextPtr ctxt) { |
| 3202 | xmlXPathEvalEqualityExpr(ctxt); |
| 3203 | CHECK_ERROR; |
| 3204 | while ((CUR == 'a') && (NXT(1) == 'n') && (NXT(2) == 'n')) { |
| 3205 | xmlXPathObjectPtr arg1, arg2; |
| 3206 | |
| 3207 | SKIP(3); |
| 3208 | xmlXPathEvalEqualityExpr(ctxt); |
| 3209 | CHECK_ERROR; |
| 3210 | arg2 = valuePop(ctxt); |
| 3211 | arg1 = valuePop(ctxt); |
| 3212 | arg1->boolval &= arg2->boolval; |
| 3213 | valuePush(ctxt, arg1); |
| 3214 | xmlXPathFreeObject(arg2); |
| 3215 | } |
| 3216 | } |
| 3217 | |
| 3218 | /** |
| 3219 | * xmlXPathEvalExpr: |
| 3220 | * @ctxt: the XPath Parser context |
| 3221 | * |
| 3222 | * [14] Expr ::= OrExpr |
| 3223 | * [21] OrExpr ::= AndExpr |
| 3224 | * | OrExpr 'or' AndExpr |
| 3225 | * |
| 3226 | * Parse and evaluate an expression, then push the result on the stack |
| 3227 | * |
| 3228 | */ |
| 3229 | void |
| 3230 | xmlXPathEvalExpr(xmlXPathParserContextPtr ctxt) { |
| 3231 | xmlXPathEvalAndExpr(ctxt); |
| 3232 | CHECK_ERROR; |
| 3233 | while ((CUR == 'o') && (NXT(1) == 'r')) { |
| 3234 | xmlXPathObjectPtr arg1, arg2; |
| 3235 | |
| 3236 | SKIP(2); |
| 3237 | xmlXPathEvalAndExpr(ctxt); |
| 3238 | CHECK_ERROR; |
| 3239 | arg2 = valuePop(ctxt); |
| 3240 | arg1 = valuePop(ctxt); |
| 3241 | arg1->boolval |= arg2->boolval; |
| 3242 | valuePush(ctxt, arg1); |
| 3243 | xmlXPathFreeObject(arg2); |
| 3244 | } |
| 3245 | } |
| 3246 | |
| 3247 | /** |
| 3248 | * xmlXPathEvaluatePredicateResult: |
| 3249 | * @ctxt: the XPath Parser context |
| 3250 | * @res: the Predicate Expression evaluation result |
| 3251 | * @index: index of the current node in the current list |
| 3252 | * |
| 3253 | * Evaluate a predicate result for the current node. |
| 3254 | * A PredicateExpr is evaluated by evaluating the Expr and converting |
| 3255 | * the result to a boolean. If the result is a number, the result will |
| 3256 | * be converted to true if the number is equal to the position of the |
| 3257 | * context node in the context node list (as returned by the position |
| 3258 | * function) and will be converted to false otherwise; if the result |
| 3259 | * is not a number, then the result will be converted as if by a call |
| 3260 | * to the boolean function. |
| 3261 | */ |
| 3262 | int |
| 3263 | xmlXPathEvaluatePredicateResult(xmlXPathParserContextPtr ctxt, |
| 3264 | xmlXPathObjectPtr res, int index) { |
| 3265 | if (res == NULL) return(0); |
| 3266 | switch (res->type) { |
| 3267 | case XPATH_BOOLEAN: |
| 3268 | return(res->boolval); |
| 3269 | case XPATH_NUMBER: |
| 3270 | return(res->floatval == index); |
| 3271 | case XPATH_NODESET: |
| 3272 | return(res->nodesetval->nodeNr != 0); |
| 3273 | case XPATH_STRING: |
| 3274 | return((res->stringval != NULL) && |
| 3275 | (xmlStrlen(res->stringval) != 0)); |
| 3276 | default: |
| 3277 | STRANGE |
| 3278 | } |
| 3279 | return(0); |
| 3280 | } |
| 3281 | |
| 3282 | /** |
| 3283 | * xmlXPathEvalPredicate: |
| 3284 | * @ctxt: the XPath Parser context |
| 3285 | * |
| 3286 | * [8] Predicate ::= '[' PredicateExpr ']' |
| 3287 | * [9] PredicateExpr ::= Expr |
| 3288 | * |
| 3289 | * Parse and evaluate a predicate for all the elements of the |
| 3290 | * current node list. Then refine the list by removing all |
| 3291 | * nodes where the predicate is false. |
| 3292 | */ |
| 3293 | void |
| 3294 | xmlXPathEvalPredicate(xmlXPathParserContextPtr ctxt) { |
| 3295 | const CHAR *cur; |
| 3296 | xmlXPathObjectPtr res; |
| 3297 | xmlNodeSetPtr newset = NULL; |
| 3298 | int i; |
| 3299 | |
| 3300 | if (CUR != '[') { |
| 3301 | ERROR(XPATH_INVALID_PREDICATE_ERROR); |
| 3302 | } |
| 3303 | NEXT; |
| 3304 | if ((ctxt->context->nodelist == NULL) || |
| 3305 | (ctxt->context->nodelist->nodeNr == 0)) { |
| 3306 | ctxt->context->node = NULL; |
| 3307 | xmlXPathEvalExpr(ctxt); |
| 3308 | CHECK_ERROR; |
| 3309 | res = valuePop(ctxt); |
| 3310 | if (res != NULL) |
| 3311 | xmlXPathFreeObject(res); |
| 3312 | } else { |
| 3313 | cur = ctxt->cur; |
| 3314 | newset = xmlXPathNodeSetCreate(NULL); |
| 3315 | for (i = 0; i < ctxt->context->nodelist->nodeNr; i++) { |
| 3316 | ctxt->cur = cur; |
| 3317 | ctxt->context->node = ctxt->context->nodelist->nodeTab[i]; |
| 3318 | xmlXPathEvalExpr(ctxt); |
| 3319 | CHECK_ERROR; |
| 3320 | res = valuePop(ctxt); |
| 3321 | if (xmlXPathEvaluatePredicateResult(ctxt, res, i + 1)) |
| 3322 | xmlXPathNodeSetAdd(newset, |
| 3323 | ctxt->context->nodelist->nodeTab[i]); |
| 3324 | if (res != NULL) |
| 3325 | xmlXPathFreeObject(res); |
| 3326 | } |
| 3327 | if (ctxt->context->nodelist != NULL) |
| 3328 | xmlXPathFreeNodeSet(ctxt->context->nodelist); |
| 3329 | ctxt->context->nodelist = newset; |
| 3330 | ctxt->context->node = NULL; |
| 3331 | } |
| 3332 | if (CUR != ']') { |
| 3333 | ERROR(XPATH_INVALID_PREDICATE_ERROR); |
| 3334 | } |
| 3335 | NEXT; |
| 3336 | #ifdef DEBUG_STEP |
| 3337 | fprintf(xmlXPathDebug, "After predicate : "); |
| 3338 | xmlXPathDebugNodeSet(xmlXPathDebug, ctxt->context->nodelist); |
| 3339 | #endif |
| 3340 | } |
| 3341 | |
| 3342 | /** |
| 3343 | * xmlXPathEvalBasis: |
| 3344 | * @ctxt: the XPath Parser context |
| 3345 | * |
| 3346 | * [5] Basis ::= AxisName '::' NodeTest |
| 3347 | * | AbbreviatedBasis |
| 3348 | * [13] AbbreviatedBasis ::= NodeTest |
| 3349 | * | '@' NodeTest |
| 3350 | * [7] NodeTest ::= WildcardName |
| 3351 | * | NodeType '(' ')' |
| 3352 | * | 'processing-instruction' '(' Literal ')' |
| 3353 | * [37] WildcardName ::= '*' |
| 3354 | * | NCName ':' '*' |
| 3355 | * | QName |
| 3356 | * |
| 3357 | * Evaluate one step in a Location Path |
| 3358 | */ |
| 3359 | void |
| 3360 | xmlXPathEvalBasis(xmlXPathParserContextPtr ctxt) { |
| 3361 | CHAR *name = NULL; |
| 3362 | CHAR *prefix = NULL; |
| 3363 | int type = 0; |
| 3364 | int axis = AXIS_CHILD; /* the default on abbreviated syntax */ |
| 3365 | int nodetest = NODE_TEST_NONE; |
| 3366 | int nodetype = 0; |
| 3367 | xmlNodeSetPtr newset = NULL; |
| 3368 | |
| 3369 | if (CUR == '@') { |
| 3370 | TODO /* attributes */ |
| 3371 | } else if (CUR == '*') { |
| 3372 | NEXT; |
| 3373 | nodetest = NODE_TEST_ALL; |
| 3374 | } else { |
| 3375 | name = xmlXPathParseNCName(ctxt); |
| 3376 | if (name == NULL) { |
| 3377 | ERROR(XPATH_EXPR_ERROR); |
| 3378 | } |
| 3379 | type = xmlXPathGetNameType(ctxt, name); |
| 3380 | switch (type) { |
| 3381 | /* |
| 3382 | * Simple case: no axis seach all given node types. |
| 3383 | */ |
| 3384 | case NODE_TYPE_COMMENT: |
| 3385 | if ((CUR != '(') || (NXT(1) != ')')) break; |
| 3386 | SKIP(2); |
| 3387 | nodetest = NODE_TEST_TYPE; |
| 3388 | nodetype = XML_COMMENT_NODE; |
| 3389 | goto search_nodes; |
| 3390 | case NODE_TYPE_TEXT: |
| 3391 | if ((CUR != '(') || (NXT(1) != ')')) break; |
| 3392 | SKIP(2); |
| 3393 | nodetest = NODE_TEST_TYPE; |
| 3394 | nodetype = XML_TEXT_NODE; |
| 3395 | goto search_nodes; |
| 3396 | case NODE_TYPE_NODE: |
| 3397 | if ((CUR != '(') || (NXT(1) != ')')) { |
| 3398 | nodetest = NODE_TEST_NAME; |
| 3399 | break; |
| 3400 | } |
| 3401 | SKIP(2); |
| 3402 | nodetest = NODE_TEST_TYPE; |
| 3403 | nodetype = XML_ELEMENT_NODE; |
| 3404 | goto search_nodes; |
| 3405 | case NODE_TYPE_PI: |
| 3406 | if (CUR != '(') break; |
| 3407 | if (NXT(1) != ')') { |
| 3408 | /* |
| 3409 | * Specific case: search a PI by name. |
| 3410 | */ |
| 3411 | SKIP(2); |
| 3412 | nodetest = NODE_TEST_PI; |
| 3413 | xmlXPathEvalLiteral(ctxt); |
| 3414 | CHECK_ERROR; |
| 3415 | if (CUR != ')') |
| 3416 | ERROR(XPATH_UNCLOSED_ERROR); |
| 3417 | xmlXPathSearchPI(ctxt, 0); |
| 3418 | return; |
| 3419 | } |
| 3420 | SKIP(2); |
| 3421 | nodetest = NODE_TEST_TYPE; |
| 3422 | nodetype = XML_PI_NODE; |
| 3423 | goto search_nodes; |
| 3424 | |
| 3425 | /* |
| 3426 | * Handling of the compund form: got the axis. |
| 3427 | */ |
| 3428 | case AXIS_ANCESTOR: |
| 3429 | case AXIS_ANCESTOR_OR_SELF: |
| 3430 | case AXIS_ATTRIBUTE: |
| 3431 | case AXIS_CHILD: |
| 3432 | case AXIS_DESCENDANT: |
| 3433 | case AXIS_DESCENDANT_OR_SELF: |
| 3434 | case AXIS_FOLLOWING: |
| 3435 | case AXIS_FOLLOWING_SIBLING: |
| 3436 | case AXIS_NAMESPACE: |
| 3437 | case AXIS_PARENT: |
| 3438 | case AXIS_PRECEDING: |
| 3439 | case AXIS_PRECEDING_SIBLING: |
| 3440 | case AXIS_SELF: |
| 3441 | if ((CUR != ':') || (NXT(1) != ':')) { |
| 3442 | nodetest = NODE_TEST_NAME; |
| 3443 | break; |
| 3444 | } |
| 3445 | SKIP(2); |
| 3446 | axis = type; |
| 3447 | break; |
| 3448 | |
| 3449 | /* |
| 3450 | * Default: abbreviated syntax the axis is AXIS_CHILD |
| 3451 | */ |
| 3452 | default: |
| 3453 | nodetest = NODE_TEST_NAME; |
| 3454 | } |
| 3455 | if (nodetest == NODE_TEST_NONE) { |
| 3456 | if (CUR == '*') { |
| 3457 | NEXT; |
| 3458 | nodetest = NODE_TEST_ALL; |
| 3459 | } else { |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 3460 | if (name != NULL) |
| 3461 | free(name); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 3462 | name = xmlXPathParseQName(ctxt, &prefix); |
| 3463 | nodetest = NODE_TEST_NAME; |
| 3464 | } |
| 3465 | } else if ((CUR == ':') && (nodetest == NODE_TEST_NAME)) { |
| 3466 | NEXT; |
| 3467 | prefix = name; |
| 3468 | if (CUR == '*') { |
| 3469 | NEXT; |
| 3470 | nodetest = NODE_TEST_ALL; |
| 3471 | } else |
| 3472 | name = xmlXPathParseNCName(ctxt); |
| 3473 | } else if (name == NULL) |
| 3474 | ERROR(XPATH_EXPR_ERROR); |
| 3475 | } |
| 3476 | |
| 3477 | search_nodes: |
| 3478 | |
| 3479 | #ifdef DEBUG_STEP |
| 3480 | fprintf(xmlXPathDebug, "Basis : computing new set\n"); |
| 3481 | #endif |
| 3482 | newset = xmlXPathNodeCollectAndTest(ctxt, axis, nodetest, nodetype, |
| 3483 | prefix, name); |
| 3484 | if (ctxt->context->nodelist != NULL) |
| 3485 | xmlXPathFreeNodeSet(ctxt->context->nodelist); |
| 3486 | ctxt->context->nodelist = newset; |
| 3487 | ctxt->context->node = NULL; |
| 3488 | #ifdef DEBUG_STEP |
| 3489 | fprintf(xmlXPathDebug, "Basis : "); |
| 3490 | xmlXPathDebugNodeSet(stdout, ctxt->context->nodelist); |
| 3491 | #endif |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 3492 | if (name != NULL) free(name); |
| 3493 | if (prefix != NULL) free(prefix); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 3494 | } |
| 3495 | |
| 3496 | /** |
| 3497 | * xmlXPathEvalStep: |
| 3498 | * @ctxt: the XPath Parser context |
| 3499 | * |
| 3500 | * [4] Step ::= Basis Predicate* |
| 3501 | * | AbbreviatedStep |
| 3502 | * [12] AbbreviatedStep ::= '.' |
| 3503 | * | '..' |
| 3504 | * |
| 3505 | * Evaluate one step in a Location Path |
| 3506 | * A location step of . is short for self::node(). This is |
| 3507 | * particularly useful in conjunction with //. For example, the |
| 3508 | * location path .//para is short for |
| 3509 | * self::node()/descendant-or-self::node()/child::para |
| 3510 | * and so will select all para descendant elements of the context |
| 3511 | * node. |
| 3512 | * Similarly, a location step of .. is short for parent::node(). |
| 3513 | * For example, ../title is short for parent::node()/child::title |
| 3514 | * and so will select the title children of the parent of the context |
| 3515 | * node. |
| 3516 | */ |
| 3517 | void |
| 3518 | xmlXPathEvalStep(xmlXPathParserContextPtr ctxt) { |
| 3519 | xmlNodeSetPtr newset = NULL; |
| 3520 | |
| 3521 | if ((CUR == '.') && (NXT(1) == '.')) { |
| 3522 | SKIP(2); |
| 3523 | if (ctxt->context->nodelist == NULL) { |
| 3524 | STRANGE |
| 3525 | xmlXPathRoot(ctxt); |
| 3526 | } |
| 3527 | newset = xmlXPathNodeCollectAndTest(ctxt, AXIS_PARENT, |
| 3528 | NODE_TEST_TYPE, XML_ELEMENT_NODE, NULL, NULL); |
| 3529 | if (ctxt->context->nodelist != NULL) |
| 3530 | xmlXPathFreeNodeSet(ctxt->context->nodelist); |
| 3531 | ctxt->context->nodelist = newset; |
| 3532 | ctxt->context->node = NULL; |
| 3533 | } else if (CUR == '.') { |
| 3534 | NEXT; |
| 3535 | } else { |
| 3536 | xmlXPathEvalBasis(ctxt); |
| 3537 | while (CUR == '[') { |
| 3538 | xmlXPathEvalPredicate(ctxt); |
| 3539 | } |
| 3540 | } |
| 3541 | #ifdef DEBUG_STEP |
| 3542 | fprintf(xmlXPathDebug, "Step : "); |
| 3543 | xmlXPathDebugNodeSet(xmlXPathDebug, ctxt->context->nodelist); |
| 3544 | #endif |
| 3545 | } |
| 3546 | |
| 3547 | /** |
| 3548 | * xmlXPathEvalRelativeLocationPath: |
| 3549 | * @ctxt: the XPath Parser context |
| 3550 | * |
| 3551 | * [3] RelativeLocationPath ::= Step |
| 3552 | * | RelativeLocationPath '/' Step |
| 3553 | * | AbbreviatedRelativeLocationPath |
| 3554 | * [11] AbbreviatedRelativeLocationPath ::= RelativeLocationPath '//' Step |
| 3555 | * |
| 3556 | */ |
| 3557 | void |
| 3558 | xmlXPathEvalRelativeLocationPath(xmlXPathParserContextPtr ctxt) { |
| 3559 | xmlNodeSetPtr newset = NULL; |
| 3560 | |
| 3561 | xmlXPathEvalStep(ctxt); |
| 3562 | while (CUR == '/') { |
| 3563 | if ((CUR == '/') && (NXT(1) == '/')) { |
| 3564 | SKIP(2); |
| 3565 | if (ctxt->context->nodelist == NULL) { |
| 3566 | STRANGE |
| 3567 | xmlXPathRoot(ctxt); |
| 3568 | } |
| 3569 | newset = xmlXPathNodeCollectAndTest(ctxt, AXIS_DESCENDANT_OR_SELF, |
| 3570 | NODE_TEST_TYPE, XML_ELEMENT_NODE, NULL, NULL); |
| 3571 | if (ctxt->context->nodelist != NULL) |
| 3572 | xmlXPathFreeNodeSet(ctxt->context->nodelist); |
| 3573 | ctxt->context->nodelist = newset; |
| 3574 | ctxt->context->node = NULL; |
| 3575 | xmlXPathEvalStep(ctxt); |
| 3576 | } else if (CUR == '/') { |
| 3577 | NEXT; |
| 3578 | xmlXPathEvalStep(ctxt); |
| 3579 | } |
| 3580 | } |
| 3581 | } |
| 3582 | |
| 3583 | /** |
| 3584 | * xmlXPathEvalLocationPath: |
| 3585 | * @ctxt: the XPath Parser context |
| 3586 | * |
| 3587 | * [1] LocationPath ::= RelativeLocationPath |
| 3588 | * | AbsoluteLocationPath |
| 3589 | * [2] AbsoluteLocationPath ::= '/' RelativeLocationPath? |
| 3590 | * | AbbreviatedAbsoluteLocationPath |
| 3591 | * [10] AbbreviatedAbsoluteLocationPath ::= |
| 3592 | * '//' RelativeLocationPath |
| 3593 | * |
| 3594 | * // is short for /descendant-or-self::node()/. For example, |
| 3595 | * //para is short for /descendant-or-self::node()/child::para and |
| 3596 | * so will select any para element in the document (even a para element |
| 3597 | * that is a document element will be selected by //para since the |
| 3598 | * document element node is a child of the root node); div//para is |
| 3599 | * short for div/descendant-or-self::node()/child::para and so will |
| 3600 | * select all para descendants of div children. |
| 3601 | */ |
| 3602 | void |
| 3603 | xmlXPathEvalLocationPath(xmlXPathParserContextPtr ctxt) { |
| 3604 | xmlNodeSetPtr newset = NULL; |
| 3605 | |
| 3606 | while (CUR == '/') { |
| 3607 | if ((CUR == '/') && (NXT(1) == '/')) { |
| 3608 | SKIP(2); |
| 3609 | if (ctxt->context->nodelist == NULL) |
| 3610 | xmlXPathRoot(ctxt); |
| 3611 | newset = xmlXPathNodeCollectAndTest(ctxt, AXIS_DESCENDANT_OR_SELF, |
| 3612 | NODE_TEST_TYPE, XML_ELEMENT_NODE, NULL, NULL); |
| 3613 | if (ctxt->context->nodelist != NULL) |
| 3614 | xmlXPathFreeNodeSet(ctxt->context->nodelist); |
| 3615 | ctxt->context->nodelist = newset; |
| 3616 | ctxt->context->node = NULL; |
| 3617 | xmlXPathEvalRelativeLocationPath(ctxt); |
| 3618 | } else if (CUR == '/') { |
| 3619 | NEXT; |
| 3620 | xmlXPathRoot(ctxt); |
| 3621 | xmlXPathEvalRelativeLocationPath(ctxt); |
| 3622 | } else { |
| 3623 | xmlXPathEvalRelativeLocationPath(ctxt); |
| 3624 | } |
| 3625 | } |
| 3626 | } |
| 3627 | |
| 3628 | /* |
| 3629 | * TODO * extra spaces * |
| 3630 | * more tokenization rules ... Not used currently, especially allowing |
| 3631 | * spaces before and after ExprToken !!!!!!!!!!!!! |
| 3632 | * |
| 3633 | * [32] Operator ::= OperatorName |
| 3634 | * | MultiplyOperator |
| 3635 | * | '/' | '//' | '|' | '+' | '-' | '=' | '!=' |
| 3636 | * | '<'| '<=' | '>' | '>=' |
| 3637 | * [33] OperatorName ::= 'and' | 'or' | 'mod' | 'div' |
| 3638 | * [39] ExprWhitespace ::= S |
| 3639 | * |
| 3640 | * BUG: ExprToken is never referenced. |
| 3641 | * |
| 3642 | * [28] ExprToken ::= '(' | ')' | '[' | ']' | '.' | '..' | '@' | ',' | '::' |
| 3643 | * | WildcardName |
| 3644 | * | NodeType |
| 3645 | * | Operator |
| 3646 | * | FunctionName |
| 3647 | * | AxisName |
| 3648 | * | Literal |
| 3649 | * | Number |
| 3650 | * | VariableReference |
| 3651 | */ |
| 3652 | |
| 3653 | /** |
| 3654 | * xmlXPathEval: |
| 3655 | * @str: the XPath expression |
| 3656 | * @ctxt: the XPath context |
| 3657 | * |
| 3658 | * Evaluate the XPath Location Path in the given context. |
| 3659 | * |
| 3660 | * Returns the xmlXPathObjectPtr resulting from the eveluation or NULL. |
| 3661 | * the caller has to free the object. |
| 3662 | */ |
| 3663 | xmlXPathObjectPtr |
| 3664 | xmlXPathEval(const CHAR *str, xmlXPathContextPtr ctxt) { |
| 3665 | xmlXPathParserContextPtr pctxt; |
| 3666 | xmlXPathObjectPtr res; |
| 3667 | |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 3668 | xmlXPathInit(); |
| 3669 | |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 3670 | CHECK_CONTEXT |
| 3671 | |
| 3672 | if (xmlXPathDebug == NULL) |
| 3673 | xmlXPathDebug = stderr; |
| 3674 | pctxt = xmlXPathNewParserContext(str, ctxt); |
| 3675 | xmlXPathEvalLocationPath(pctxt); |
| 3676 | |
| 3677 | do { |
| 3678 | res = valuePop(pctxt); |
| 3679 | #ifdef DEBUG |
| 3680 | #endif |
| 3681 | } while (res != NULL); |
| 3682 | res = xmlXPathNewNodeSetList(pctxt->context->nodelist); |
| 3683 | xmlXPathFreeParserContext(pctxt); |
| 3684 | return(res); |
| 3685 | } |
| 3686 | |
| 3687 | /** |
| 3688 | * xmlXPathEvalExpression: |
| 3689 | * @str: the XPath expression |
| 3690 | * @ctxt: the XPath context |
| 3691 | * |
| 3692 | * Evaluate the XPath expression in the given context. |
| 3693 | * |
| 3694 | * Returns the xmlXPathObjectPtr resulting from the eveluation or NULL. |
| 3695 | * the caller has to free the object. |
| 3696 | */ |
| 3697 | xmlXPathObjectPtr |
| 3698 | xmlXPathEvalExpression(const CHAR *str, xmlXPathContextPtr ctxt) { |
| 3699 | xmlXPathParserContextPtr pctxt; |
| 3700 | xmlXPathObjectPtr res, tmp; |
| 3701 | |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 3702 | xmlXPathInit(); |
| 3703 | |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 3704 | CHECK_CONTEXT |
| 3705 | |
| 3706 | if (xmlXPathDebug == NULL) |
| 3707 | xmlXPathDebug = stderr; |
| 3708 | pctxt = xmlXPathNewParserContext(str, ctxt); |
| 3709 | xmlXPathEvalExpr(pctxt); |
| 3710 | |
| 3711 | res = valuePop(pctxt); |
| 3712 | do { |
| 3713 | tmp = valuePop(pctxt); |
Daniel Veillard | e2d034d | 1999-07-27 19:52:06 +0000 | [diff] [blame^] | 3714 | if (tmp != NULL); |
| 3715 | xmlXPathFreeObject(tmp); |
Daniel Veillard | 1566d3a | 1999-07-15 14:24:29 +0000 | [diff] [blame] | 3716 | } while (tmp != NULL); |
| 3717 | xmlXPathFreeParserContext(pctxt); |
| 3718 | return(res); |
| 3719 | } |
| 3720 | |