Jarkko Poyry | 3c82736 | 2014-09-02 11:48:52 +0300 | [diff] [blame] | 1 | /*------------------------------------------------------------------------- |
| 2 | * drawElements Quality Program Test Executor |
| 3 | * ------------------------------------------ |
| 4 | * |
| 5 | * Copyright 2014 The Android Open Source Project |
| 6 | * |
| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | * you may not use this file except in compliance with the License. |
| 9 | * You may obtain a copy of the License at |
| 10 | * |
| 11 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | * |
| 13 | * Unless required by applicable law or agreed to in writing, software |
| 14 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | * See the License for the specific language governing permissions and |
| 17 | * limitations under the License. |
| 18 | * |
| 19 | *//*! |
| 20 | * \file |
| 21 | * \brief XML Parser. |
| 22 | *//*--------------------------------------------------------------------*/ |
| 23 | |
| 24 | #include "xeXMLParser.hpp" |
| 25 | #include "deInt32.h" |
| 26 | |
| 27 | namespace xe |
| 28 | { |
| 29 | namespace xml |
| 30 | { |
| 31 | |
| 32 | enum |
| 33 | { |
| 34 | TOKENIZER_INITIAL_BUFFER_SIZE = 1024 |
| 35 | }; |
| 36 | |
| 37 | static inline bool isIdentifierStartChar (int ch) |
| 38 | { |
| 39 | return de::inRange<int>(ch, 'a', 'z') || de::inRange<int>(ch, 'A', 'Z'); |
| 40 | } |
| 41 | |
| 42 | static inline bool isIdentifierChar (int ch) |
| 43 | { |
| 44 | return isIdentifierStartChar(ch) || de::inRange<int>(ch, '0', '9') || (ch == '-') || (ch == '_'); |
| 45 | } |
| 46 | |
| 47 | static inline bool isWhitespaceChar (int ch) |
| 48 | { |
| 49 | return ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n'; |
| 50 | } |
| 51 | |
| 52 | static int getNextBufferSize (int curSize, int minNewSize) |
| 53 | { |
| 54 | return de::max(curSize*2, 1<<deLog2Ceil32(minNewSize)); |
| 55 | } |
| 56 | |
| 57 | Tokenizer::Tokenizer (void) |
| 58 | : m_curToken (TOKEN_INCOMPLETE) |
| 59 | , m_curTokenLen (0) |
| 60 | , m_state (STATE_DATA) |
| 61 | , m_buf (TOKENIZER_INITIAL_BUFFER_SIZE) |
| 62 | { |
| 63 | } |
| 64 | |
| 65 | Tokenizer::~Tokenizer (void) |
| 66 | { |
| 67 | } |
| 68 | |
| 69 | void Tokenizer::clear (void) |
| 70 | { |
| 71 | m_curToken = TOKEN_INCOMPLETE; |
| 72 | m_curTokenLen = 0; |
| 73 | m_state = STATE_DATA; |
| 74 | m_buf.clear(); |
| 75 | } |
| 76 | |
| 77 | void Tokenizer::error (const std::string& what) |
| 78 | { |
| 79 | throw ParseError(what); |
| 80 | } |
| 81 | |
| 82 | void Tokenizer::feed (const deUint8* bytes, int numBytes) |
| 83 | { |
| 84 | // Grow buffer if necessary. |
| 85 | if (m_buf.getNumFree() < numBytes) |
| 86 | { |
| 87 | m_buf.resize(getNextBufferSize(m_buf.getSize(), m_buf.getNumElements()+numBytes)); |
| 88 | } |
| 89 | |
| 90 | // Append to front. |
| 91 | m_buf.pushFront(bytes, numBytes); |
| 92 | |
| 93 | // If we haven't parsed complete token, re-try after data feed. |
| 94 | if (m_curToken == TOKEN_INCOMPLETE) |
| 95 | advance(); |
| 96 | } |
| 97 | |
| 98 | int Tokenizer::getChar (int offset) const |
| 99 | { |
| 100 | DE_ASSERT(de::inRange(offset, 0, m_buf.getNumElements())); |
| 101 | |
| 102 | if (offset < m_buf.getNumElements()) |
| 103 | return m_buf.peekBack(offset); |
| 104 | else |
| 105 | return END_OF_BUFFER; |
| 106 | } |
| 107 | |
| 108 | void Tokenizer::advance (void) |
| 109 | { |
| 110 | if (m_curToken != TOKEN_INCOMPLETE) |
| 111 | { |
| 112 | // Parser should not try to advance beyond end of string. |
| 113 | DE_ASSERT(m_curToken != TOKEN_END_OF_STRING); |
| 114 | |
| 115 | // If current token is tag end, change state to data. |
| 116 | if (m_curToken == TOKEN_TAG_END || |
| 117 | m_curToken == TOKEN_EMPTY_ELEMENT_END || |
| 118 | m_curToken == TOKEN_PROCESSING_INSTRUCTION_END || |
| 119 | m_curToken == TOKEN_COMMENT || |
| 120 | m_curToken == TOKEN_ENTITY) |
| 121 | m_state = STATE_DATA; |
| 122 | |
| 123 | // Advance buffer by length of last token. |
| 124 | m_buf.popBack(m_curTokenLen); |
| 125 | |
| 126 | // Reset state. |
| 127 | m_curToken = TOKEN_INCOMPLETE; |
| 128 | m_curTokenLen = 0; |
| 129 | |
| 130 | // If we hit end of string here, report it as end of string. |
| 131 | if (getChar(0) == END_OF_STRING) |
| 132 | { |
| 133 | m_curToken = TOKEN_END_OF_STRING; |
| 134 | m_curTokenLen = 1; |
| 135 | return; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | int curChar = getChar(m_curTokenLen); |
| 140 | |
| 141 | for (;;) |
| 142 | { |
| 143 | if (m_state == STATE_DATA) |
| 144 | { |
| 145 | // Advance until we hit end of buffer or tag start and treat that as data token. |
| 146 | if (curChar == END_OF_STRING || curChar == (int)END_OF_BUFFER || curChar == '<' || curChar == '&') |
| 147 | { |
| 148 | if (curChar == '<') |
| 149 | m_state = STATE_TAG; |
| 150 | else if (curChar == '&') |
| 151 | m_state = STATE_ENTITY; |
| 152 | |
| 153 | if (m_curTokenLen > 0) |
| 154 | { |
| 155 | // Report data token. |
| 156 | m_curToken = TOKEN_DATA; |
| 157 | return; |
| 158 | } |
| 159 | else if (curChar == END_OF_STRING || curChar == (int)END_OF_BUFFER) |
| 160 | { |
| 161 | // Just return incomplete token, no data parsed. |
| 162 | return; |
| 163 | } |
| 164 | else |
| 165 | { |
| 166 | DE_ASSERT(m_state == STATE_TAG || m_state == STATE_ENTITY); |
| 167 | continue; |
| 168 | } |
| 169 | } |
| 170 | } |
| 171 | else |
| 172 | { |
| 173 | // Eat all whitespace if present. |
| 174 | if (m_curTokenLen == 0) |
| 175 | { |
| 176 | while (isWhitespaceChar(curChar)) |
| 177 | { |
| 178 | m_buf.popBack(); |
| 179 | curChar = getChar(0); |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | // Handle end of string / buffer. |
| 184 | if (curChar == END_OF_STRING) |
| 185 | error("Unexpected end of string"); |
| 186 | else if (curChar == (int)END_OF_BUFFER) |
| 187 | { |
| 188 | DE_ASSERT(m_curToken == TOKEN_INCOMPLETE); |
| 189 | return; |
| 190 | } |
| 191 | |
| 192 | if (m_curTokenLen == 0) |
| 193 | { |
| 194 | // Expect start of identifier, value or special tag token. |
| 195 | if (curChar == '\'' || curChar == '"') |
| 196 | m_state = STATE_VALUE; |
| 197 | else if (isIdentifierStartChar(curChar)) |
| 198 | m_state = STATE_IDENTIFIER; |
| 199 | else if (curChar == '<' || curChar == '?' || curChar == '/') |
| 200 | m_state = STATE_TAG; |
| 201 | else if (curChar == '&') |
| 202 | DE_ASSERT(m_state == STATE_ENTITY); |
| 203 | else if (curChar == '=') |
| 204 | { |
| 205 | m_curToken = TOKEN_EQUAL; |
| 206 | m_curTokenLen = 1; |
| 207 | return; |
| 208 | } |
| 209 | else if (curChar == '>') |
| 210 | { |
| 211 | m_curToken = TOKEN_TAG_END; |
| 212 | m_curTokenLen = 1; |
| 213 | return; |
| 214 | } |
| 215 | else |
| 216 | error("Unexpected character"); |
| 217 | } |
| 218 | else if (m_state == STATE_IDENTIFIER) |
| 219 | { |
| 220 | if (!isIdentifierChar(curChar)) |
| 221 | { |
| 222 | m_curToken = TOKEN_IDENTIFIER; |
| 223 | return; |
| 224 | } |
| 225 | } |
| 226 | else if (m_state == STATE_VALUE) |
| 227 | { |
| 228 | // \todo [2012-06-07 pyry] Escapes. |
| 229 | if (curChar == '\'' || curChar == '"') |
| 230 | { |
| 231 | // \todo [2012-10-17 pyry] Should we actually do the check against getChar(0)? |
| 232 | if (curChar != getChar(0)) |
| 233 | error("Mismatched quote"); |
| 234 | m_curToken = TOKEN_STRING; |
| 235 | m_curTokenLen += 1; |
| 236 | return; |
| 237 | } |
| 238 | } |
| 239 | else if (m_state == STATE_COMMENT) |
| 240 | { |
| 241 | DE_ASSERT(m_curTokenLen >= 2); // 2 characters have been parsed if we are in comment state. |
| 242 | |
| 243 | if (m_curTokenLen <= 3) |
| 244 | { |
| 245 | if (curChar != '-') |
| 246 | error("Invalid comment start"); |
| 247 | } |
| 248 | else |
| 249 | { |
| 250 | int prev2 = m_curTokenLen > 5 ? getChar(m_curTokenLen-2) : 0; |
| 251 | int prev1 = m_curTokenLen > 4 ? getChar(m_curTokenLen-1) : 0; |
| 252 | |
| 253 | if (prev2 == '-' && prev1 == '-') |
| 254 | { |
| 255 | if (curChar != '>') |
| 256 | error("Invalid comment end"); |
| 257 | m_curToken = TOKEN_COMMENT; |
| 258 | m_curTokenLen += 1; |
| 259 | return; |
| 260 | } |
| 261 | } |
| 262 | } |
| 263 | else if (m_state == STATE_ENTITY) |
| 264 | { |
| 265 | if (m_curTokenLen >= 1) |
| 266 | { |
| 267 | if (curChar == ';') |
| 268 | { |
| 269 | m_curToken = TOKEN_ENTITY; |
| 270 | m_curTokenLen += 1; |
| 271 | return; |
| 272 | } |
| 273 | else if (!de::inRange<int>(curChar, '0', '9') && |
| 274 | !de::inRange<int>(curChar, 'a', 'z') && |
| 275 | !de::inRange<int>(curChar, 'A', 'Z')) |
| 276 | error("Invalid entity"); |
| 277 | } |
| 278 | } |
| 279 | else |
| 280 | { |
| 281 | // Special tokens are at most 2 characters. |
| 282 | DE_ASSERT(m_state == STATE_TAG && m_curTokenLen == 1); |
| 283 | |
| 284 | int prevChar = getChar(m_curTokenLen-1); |
| 285 | |
| 286 | if (prevChar == '<') |
| 287 | { |
| 288 | // Tag start. |
| 289 | if (curChar == '/') |
| 290 | { |
| 291 | m_curToken = TOKEN_END_TAG_START; |
| 292 | m_curTokenLen = 2; |
| 293 | return; |
| 294 | } |
| 295 | else if (curChar == '?') |
| 296 | { |
| 297 | m_curToken = TOKEN_PROCESSING_INSTRUCTION_START; |
| 298 | m_curTokenLen = 2; |
| 299 | return; |
| 300 | } |
| 301 | else if (curChar == '!') |
| 302 | { |
| 303 | m_state = STATE_COMMENT; |
| 304 | } |
| 305 | else |
| 306 | { |
| 307 | m_curToken = TOKEN_TAG_START; |
| 308 | m_curTokenLen = 1; |
| 309 | return; |
| 310 | } |
| 311 | } |
| 312 | else if (prevChar == '?') |
| 313 | { |
| 314 | if (curChar != '>') |
| 315 | error("Invalid processing instruction end"); |
| 316 | m_curToken = TOKEN_PROCESSING_INSTRUCTION_END; |
| 317 | m_curTokenLen = 2; |
| 318 | return; |
| 319 | } |
| 320 | else if (prevChar == '/') |
| 321 | { |
| 322 | if (curChar != '>') |
| 323 | error("Invalid empty element end"); |
| 324 | m_curToken = TOKEN_EMPTY_ELEMENT_END; |
| 325 | m_curTokenLen = 2; |
| 326 | return; |
| 327 | } |
| 328 | else |
| 329 | error("Could not parse special token"); |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | m_curTokenLen += 1; |
| 334 | curChar = getChar(m_curTokenLen); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | void Tokenizer::getString (std::string& dst) const |
| 339 | { |
| 340 | DE_ASSERT(m_curToken == TOKEN_STRING); |
| 341 | dst.resize(m_curTokenLen-2); |
| 342 | for (int ndx = 0; ndx < m_curTokenLen-2; ndx++) |
| 343 | dst[ndx] = m_buf.peekBack(ndx+1); |
| 344 | } |
| 345 | |
| 346 | Parser::Parser (void) |
| 347 | : m_element (ELEMENT_INCOMPLETE) |
| 348 | , m_state (STATE_DATA) |
| 349 | { |
| 350 | } |
| 351 | |
| 352 | Parser::~Parser (void) |
| 353 | { |
| 354 | } |
| 355 | |
| 356 | void Parser::clear (void) |
| 357 | { |
| 358 | m_tokenizer.clear(); |
| 359 | m_elementName.clear(); |
| 360 | m_attributes.clear(); |
| 361 | m_attribName.clear(); |
| 362 | m_entityValue.clear(); |
| 363 | |
| 364 | m_element = ELEMENT_INCOMPLETE; |
| 365 | m_state = STATE_DATA; |
| 366 | } |
| 367 | |
| 368 | void Parser::error (const std::string& what) |
| 369 | { |
| 370 | throw ParseError(what); |
| 371 | } |
| 372 | |
| 373 | void Parser::feed (const deUint8* bytes, int numBytes) |
| 374 | { |
| 375 | m_tokenizer.feed(bytes, numBytes); |
| 376 | |
| 377 | if (m_element == ELEMENT_INCOMPLETE) |
| 378 | advance(); |
| 379 | } |
| 380 | |
| 381 | void Parser::advance (void) |
| 382 | { |
| 383 | if (m_element == ELEMENT_START) |
| 384 | m_attributes.clear(); |
| 385 | |
| 386 | // \note No token is advanced when element end is reported. |
| 387 | if (m_state == STATE_YIELD_EMPTY_ELEMENT_END) |
| 388 | { |
| 389 | DE_ASSERT(m_element == ELEMENT_START); |
| 390 | m_element = ELEMENT_END; |
| 391 | m_state = STATE_DATA; |
| 392 | return; |
| 393 | } |
| 394 | |
| 395 | if (m_element != ELEMENT_INCOMPLETE) |
| 396 | { |
| 397 | m_tokenizer.advance(); |
| 398 | m_element = ELEMENT_INCOMPLETE; |
| 399 | } |
| 400 | |
| 401 | for (;;) |
| 402 | { |
| 403 | Token curToken = m_tokenizer.getToken(); |
| 404 | |
| 405 | // Skip comments. |
| 406 | while (curToken == TOKEN_COMMENT) |
| 407 | { |
| 408 | m_tokenizer.advance(); |
| 409 | curToken = m_tokenizer.getToken(); |
| 410 | } |
| 411 | |
| 412 | if (curToken == TOKEN_INCOMPLETE) |
| 413 | { |
| 414 | DE_ASSERT(m_element == ELEMENT_INCOMPLETE); |
| 415 | return; |
| 416 | } |
| 417 | |
| 418 | switch (m_state) |
| 419 | { |
| 420 | case STATE_ENTITY: |
| 421 | m_state = STATE_DATA; |
| 422 | // Fall-through to STATE_DATA processing. |
| 423 | |
| 424 | case STATE_DATA: |
| 425 | switch (curToken) |
| 426 | { |
| 427 | case TOKEN_DATA: |
| 428 | m_element = ELEMENT_DATA; |
| 429 | return; |
| 430 | |
| 431 | case TOKEN_END_OF_STRING: |
| 432 | m_element = ELEMENT_END_OF_STRING; |
| 433 | return; |
| 434 | |
| 435 | case TOKEN_TAG_START: |
| 436 | m_state = STATE_START_TAG_OPEN; |
| 437 | break; |
| 438 | |
| 439 | case TOKEN_END_TAG_START: |
| 440 | m_state = STATE_END_TAG_OPEN; |
| 441 | break; |
| 442 | |
| 443 | case TOKEN_PROCESSING_INSTRUCTION_START: |
| 444 | m_state = STATE_IN_PROCESSING_INSTRUCTION; |
| 445 | break; |
| 446 | |
| 447 | case TOKEN_ENTITY: |
| 448 | m_state = STATE_ENTITY; |
| 449 | m_element = ELEMENT_DATA; |
| 450 | parseEntityValue(); |
| 451 | return; |
| 452 | |
| 453 | default: |
| 454 | error("Unexpected token"); |
| 455 | } |
| 456 | break; |
| 457 | |
| 458 | case STATE_IN_PROCESSING_INSTRUCTION: |
| 459 | if (curToken == TOKEN_PROCESSING_INSTRUCTION_END) |
| 460 | m_state = STATE_DATA; |
| 461 | else |
| 462 | if (curToken != TOKEN_IDENTIFIER && curToken != TOKEN_EQUAL && curToken != TOKEN_STRING) |
| 463 | error("Unexpected token in processing instruction"); |
| 464 | break; |
| 465 | |
| 466 | case STATE_START_TAG_OPEN: |
| 467 | if (curToken != TOKEN_IDENTIFIER) |
| 468 | error("Expected identifier"); |
| 469 | m_tokenizer.getTokenStr(m_elementName); |
| 470 | m_state = STATE_ATTRIBUTE_LIST; |
| 471 | break; |
| 472 | |
| 473 | case STATE_END_TAG_OPEN: |
| 474 | if (curToken != TOKEN_IDENTIFIER) |
| 475 | error("Expected identifier"); |
| 476 | m_tokenizer.getTokenStr(m_elementName); |
| 477 | m_state = STATE_EXPECTING_END_TAG_CLOSE; |
| 478 | break; |
| 479 | |
| 480 | case STATE_EXPECTING_END_TAG_CLOSE: |
| 481 | if (curToken != TOKEN_TAG_END) |
| 482 | error("Expected tag end"); |
| 483 | m_state = STATE_DATA; |
| 484 | m_element = ELEMENT_END; |
| 485 | return; |
| 486 | |
| 487 | case STATE_ATTRIBUTE_LIST: |
| 488 | if (curToken == TOKEN_IDENTIFIER) |
| 489 | { |
| 490 | m_tokenizer.getTokenStr(m_attribName); |
| 491 | m_state = STATE_EXPECTING_ATTRIBUTE_EQ; |
| 492 | } |
| 493 | else if (curToken == TOKEN_EMPTY_ELEMENT_END) |
| 494 | { |
| 495 | m_state = STATE_YIELD_EMPTY_ELEMENT_END; |
| 496 | m_element = ELEMENT_START; |
| 497 | return; |
| 498 | } |
| 499 | else if (curToken == TOKEN_TAG_END) |
| 500 | { |
| 501 | m_state = STATE_DATA; |
| 502 | m_element = ELEMENT_START; |
| 503 | return; |
| 504 | } |
| 505 | else |
| 506 | error("Unexpected token"); |
| 507 | break; |
| 508 | |
| 509 | case STATE_EXPECTING_ATTRIBUTE_EQ: |
| 510 | if (curToken != TOKEN_EQUAL) |
| 511 | error("Expected '='"); |
| 512 | m_state = STATE_EXPECTING_ATTRIBUTE_VALUE; |
| 513 | break; |
| 514 | |
| 515 | case STATE_EXPECTING_ATTRIBUTE_VALUE: |
| 516 | if (curToken != TOKEN_STRING) |
| 517 | error("Expected value"); |
| 518 | if (hasAttribute(m_attribName.c_str())) |
| 519 | error("Duplicate attribute"); |
| 520 | |
| 521 | m_tokenizer.getString(m_attributes[m_attribName]); |
| 522 | m_state = STATE_ATTRIBUTE_LIST; |
| 523 | break; |
| 524 | |
| 525 | default: |
| 526 | DE_ASSERT(false); |
| 527 | } |
| 528 | |
| 529 | m_tokenizer.advance(); |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | static char getEntityValue (const std::string& entity) |
| 534 | { |
| 535 | static const struct |
| 536 | { |
| 537 | const char* name; |
| 538 | char value; |
| 539 | } s_entities[] = |
| 540 | { |
| 541 | { "<", '<' }, |
| 542 | { ">", '>' }, |
| 543 | { "&", '&' }, |
| 544 | { "'", '\''}, |
| 545 | { """, '"' }, |
| 546 | }; |
| 547 | |
| 548 | for (int ndx = 0; ndx < DE_LENGTH_OF_ARRAY(s_entities); ndx++) |
| 549 | { |
| 550 | if (entity == s_entities[ndx].name) |
| 551 | return s_entities[ndx].value; |
| 552 | } |
| 553 | |
| 554 | return 0; |
| 555 | } |
| 556 | |
| 557 | void Parser::parseEntityValue (void) |
| 558 | { |
| 559 | DE_ASSERT(m_state == STATE_ENTITY && m_tokenizer.getToken() == TOKEN_ENTITY); |
| 560 | |
| 561 | std::string entity; |
| 562 | m_tokenizer.getTokenStr(entity); |
| 563 | |
| 564 | const char value = getEntityValue(entity); |
| 565 | if (value == 0) |
| 566 | error("Invalid entity '" + entity + "'"); |
| 567 | |
| 568 | m_entityValue.resize(1); |
| 569 | m_entityValue[0] = value; |
| 570 | } |
| 571 | |
| 572 | } // xml |
| 573 | } // xe |