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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "platform/inspector_protocol/Parser.h" | |
| 6 | |
| 7 #include "platform/inspector_protocol/String16.h" | |
| 8 #include "platform/inspector_protocol/Values.h" | |
| 9 | |
| 10 namespace blink { | |
| 11 namespace protocol { | |
| 12 | |
| 13 namespace { | |
| 14 | |
| 15 const int stackLimit = 1000; | |
| 16 | |
| 17 enum Token { | |
| 18 ObjectBegin, | |
| 19 ObjectEnd, | |
| 20 ArrayBegin, | |
| 21 ArrayEnd, | |
| 22 StringLiteral, | |
| 23 Number, | |
| 24 BoolTrue, | |
| 25 BoolFalse, | |
| 26 NullToken, | |
| 27 ListSeparator, | |
| 28 ObjectPairSeparator, | |
| 29 InvalidToken, | |
| 30 }; | |
| 31 | |
| 32 const char* const nullString = "null"; | |
| 33 const char* const trueString = "true"; | |
| 34 const char* const falseString = "false"; | |
| 35 | |
| 36 bool parseConstToken(const UChar* start, const UChar* end, const UChar** tokenEn
d, const char* token) | |
| 37 { | |
| 38 while (start < end && *token != '\0' && *start++ == *token++) { } | |
| 39 if (*token != '\0') | |
| 40 return false; | |
| 41 *tokenEnd = start; | |
| 42 return true; | |
| 43 } | |
| 44 | |
| 45 bool readInt(const UChar* start, const UChar* end, const UChar** tokenEnd, bool
canHaveLeadingZeros) | |
| 46 { | |
| 47 if (start == end) | |
| 48 return false; | |
| 49 bool haveLeadingZero = '0' == *start; | |
| 50 int length = 0; | |
| 51 while (start < end && '0' <= *start && *start <= '9') { | |
| 52 ++start; | |
| 53 ++length; | |
| 54 } | |
| 55 if (!length) | |
| 56 return false; | |
| 57 if (!canHaveLeadingZeros && length > 1 && haveLeadingZero) | |
| 58 return false; | |
| 59 *tokenEnd = start; | |
| 60 return true; | |
| 61 } | |
| 62 | |
| 63 bool parseNumberToken(const UChar* start, const UChar* end, const UChar** tokenE
nd) | |
| 64 { | |
| 65 // We just grab the number here. We validate the size in DecodeNumber. | |
| 66 // According to RFC4627, a valid number is: [minus] int [frac] [exp] | |
| 67 if (start == end) | |
| 68 return false; | |
| 69 UChar c = *start; | |
| 70 if ('-' == c) | |
| 71 ++start; | |
| 72 | |
| 73 if (!readInt(start, end, &start, false)) | |
| 74 return false; | |
| 75 if (start == end) { | |
| 76 *tokenEnd = start; | |
| 77 return true; | |
| 78 } | |
| 79 | |
| 80 // Optional fraction part | |
| 81 c = *start; | |
| 82 if ('.' == c) { | |
| 83 ++start; | |
| 84 if (!readInt(start, end, &start, true)) | |
| 85 return false; | |
| 86 if (start == end) { | |
| 87 *tokenEnd = start; | |
| 88 return true; | |
| 89 } | |
| 90 c = *start; | |
| 91 } | |
| 92 | |
| 93 // Optional exponent part | |
| 94 if ('e' == c || 'E' == c) { | |
| 95 ++start; | |
| 96 if (start == end) | |
| 97 return false; | |
| 98 c = *start; | |
| 99 if ('-' == c || '+' == c) { | |
| 100 ++start; | |
| 101 if (start == end) | |
| 102 return false; | |
| 103 } | |
| 104 if (!readInt(start, end, &start, true)) | |
| 105 return false; | |
| 106 } | |
| 107 | |
| 108 *tokenEnd = start; | |
| 109 return true; | |
| 110 } | |
| 111 | |
| 112 bool readHexDigits(const UChar* start, const UChar* end, const UChar** tokenEnd,
int digits) | |
| 113 { | |
| 114 if (end - start < digits) | |
| 115 return false; | |
| 116 for (int i = 0; i < digits; ++i) { | |
| 117 UChar c = *start++; | |
| 118 if (!(('0' <= c && c <= '9') || ('a' <= c && c <= 'f') || ('A' <= c && c
<= 'F'))) | |
| 119 return false; | |
| 120 } | |
| 121 *tokenEnd = start; | |
| 122 return true; | |
| 123 } | |
| 124 | |
| 125 bool parseStringToken(const UChar* start, const UChar* end, const UChar** tokenE
nd) | |
| 126 { | |
| 127 while (start < end) { | |
| 128 UChar c = *start++; | |
| 129 if ('\\' == c) { | |
| 130 c = *start++; | |
| 131 // Make sure the escaped char is valid. | |
| 132 switch (c) { | |
| 133 case 'x': | |
| 134 if (!readHexDigits(start, end, &start, 2)) | |
| 135 return false; | |
| 136 break; | |
| 137 case 'u': | |
| 138 if (!readHexDigits(start, end, &start, 4)) | |
| 139 return false; | |
| 140 break; | |
| 141 case '\\': | |
| 142 case '/': | |
| 143 case 'b': | |
| 144 case 'f': | |
| 145 case 'n': | |
| 146 case 'r': | |
| 147 case 't': | |
| 148 case 'v': | |
| 149 case '"': | |
| 150 break; | |
| 151 default: | |
| 152 return false; | |
| 153 } | |
| 154 } else if ('"' == c) { | |
| 155 *tokenEnd = start; | |
| 156 return true; | |
| 157 } | |
| 158 } | |
| 159 return false; | |
| 160 } | |
| 161 | |
| 162 bool skipComment(const UChar* start, const UChar* end, const UChar** commentEnd) | |
| 163 { | |
| 164 if (start == end) | |
| 165 return false; | |
| 166 | |
| 167 if (*start != '/' || start + 1 >= end) | |
| 168 return false; | |
| 169 ++start; | |
| 170 | |
| 171 if (*start == '/') { | |
| 172 // Single line comment, read to newline. | |
| 173 for (++start; start < end; ++start) { | |
| 174 if (*start == '\n' || *start == '\r') { | |
| 175 *commentEnd = start + 1; | |
| 176 return true; | |
| 177 } | |
| 178 } | |
| 179 *commentEnd = end; | |
| 180 // Comment reaches end-of-input, which is fine. | |
| 181 return true; | |
| 182 } | |
| 183 | |
| 184 if (*start == '*') { | |
| 185 UChar previous = '\0'; | |
| 186 // Block comment, read until end marker. | |
| 187 for (++start; start < end; previous = *start++) { | |
| 188 if (previous == '*' && *start == '/') { | |
| 189 *commentEnd = start + 1; | |
| 190 return true; | |
| 191 } | |
| 192 } | |
| 193 // Block comment must close before end-of-input. | |
| 194 return false; | |
| 195 } | |
| 196 | |
| 197 return false; | |
| 198 } | |
| 199 | |
| 200 void skipWhitespaceAndComments(const UChar* start, const UChar* end, const UChar
** whitespaceEnd) | |
| 201 { | |
| 202 while (start < end) { | |
| 203 if (String16::isSpaceOrNewLine(*start)) { | |
| 204 ++start; | |
| 205 } else if (*start == '/') { | |
| 206 const UChar* commentEnd; | |
| 207 if (!skipComment(start, end, &commentEnd)) | |
| 208 break; | |
| 209 start = commentEnd; | |
| 210 } else { | |
| 211 break; | |
| 212 } | |
| 213 } | |
| 214 *whitespaceEnd = start; | |
| 215 } | |
| 216 | |
| 217 Token parseToken(const UChar* start, const UChar* end, const UChar** tokenStart,
const UChar** tokenEnd) | |
| 218 { | |
| 219 skipWhitespaceAndComments(start, end, tokenStart); | |
| 220 start = *tokenStart; | |
| 221 | |
| 222 if (start == end) | |
| 223 return InvalidToken; | |
| 224 | |
| 225 switch (*start) { | |
| 226 case 'n': | |
| 227 if (parseConstToken(start, end, tokenEnd, nullString)) | |
| 228 return NullToken; | |
| 229 break; | |
| 230 case 't': | |
| 231 if (parseConstToken(start, end, tokenEnd, trueString)) | |
| 232 return BoolTrue; | |
| 233 break; | |
| 234 case 'f': | |
| 235 if (parseConstToken(start, end, tokenEnd, falseString)) | |
| 236 return BoolFalse; | |
| 237 break; | |
| 238 case '[': | |
| 239 *tokenEnd = start + 1; | |
| 240 return ArrayBegin; | |
| 241 case ']': | |
| 242 *tokenEnd = start + 1; | |
| 243 return ArrayEnd; | |
| 244 case ',': | |
| 245 *tokenEnd = start + 1; | |
| 246 return ListSeparator; | |
| 247 case '{': | |
| 248 *tokenEnd = start + 1; | |
| 249 return ObjectBegin; | |
| 250 case '}': | |
| 251 *tokenEnd = start + 1; | |
| 252 return ObjectEnd; | |
| 253 case ':': | |
| 254 *tokenEnd = start + 1; | |
| 255 return ObjectPairSeparator; | |
| 256 case '0': | |
| 257 case '1': | |
| 258 case '2': | |
| 259 case '3': | |
| 260 case '4': | |
| 261 case '5': | |
| 262 case '6': | |
| 263 case '7': | |
| 264 case '8': | |
| 265 case '9': | |
| 266 case '-': | |
| 267 if (parseNumberToken(start, end, tokenEnd)) | |
| 268 return Number; | |
| 269 break; | |
| 270 case '"': | |
| 271 if (parseStringToken(start + 1, end, tokenEnd)) | |
| 272 return StringLiteral; | |
| 273 break; | |
| 274 } | |
| 275 return InvalidToken; | |
| 276 } | |
| 277 | |
| 278 inline int hexToInt(UChar c) | |
| 279 { | |
| 280 if ('0' <= c && c <= '9') | |
| 281 return c - '0'; | |
| 282 if ('A' <= c && c <= 'F') | |
| 283 return c - 'A' + 10; | |
| 284 if ('a' <= c && c <= 'f') | |
| 285 return c - 'a' + 10; | |
| 286 NOTREACHED(); | |
| 287 return 0; | |
| 288 } | |
| 289 | |
| 290 bool decodeString(const UChar* start, const UChar* end, String16Builder* output) | |
| 291 { | |
| 292 while (start < end) { | |
| 293 UChar c = *start++; | |
| 294 if ('\\' != c) { | |
| 295 output->append(c); | |
| 296 continue; | |
| 297 } | |
| 298 c = *start++; | |
| 299 | |
| 300 if (c == 'x') { | |
| 301 // \x is not supported. | |
| 302 return false; | |
| 303 } | |
| 304 | |
| 305 switch (c) { | |
| 306 case '"': | |
| 307 case '/': | |
| 308 case '\\': | |
| 309 break; | |
| 310 case 'b': | |
| 311 c = '\b'; | |
| 312 break; | |
| 313 case 'f': | |
| 314 c = '\f'; | |
| 315 break; | |
| 316 case 'n': | |
| 317 c = '\n'; | |
| 318 break; | |
| 319 case 'r': | |
| 320 c = '\r'; | |
| 321 break; | |
| 322 case 't': | |
| 323 c = '\t'; | |
| 324 break; | |
| 325 case 'v': | |
| 326 c = '\v'; | |
| 327 break; | |
| 328 case 'u': | |
| 329 c = (hexToInt(*start) << 12) + | |
| 330 (hexToInt(*(start + 1)) << 8) + | |
| 331 (hexToInt(*(start + 2)) << 4) + | |
| 332 hexToInt(*(start + 3)); | |
| 333 start += 4; | |
| 334 break; | |
| 335 default: | |
| 336 return false; | |
| 337 } | |
| 338 output->append(c); | |
| 339 } | |
| 340 return true; | |
| 341 } | |
| 342 | |
| 343 bool decodeString(const UChar* start, const UChar* end, String16* output) | |
| 344 { | |
| 345 if (start == end) { | |
| 346 *output = ""; | |
| 347 return true; | |
| 348 } | |
| 349 if (start > end) | |
| 350 return false; | |
| 351 String16Builder buffer; | |
| 352 buffer.reserveCapacity(end - start); | |
| 353 if (!decodeString(start, end, &buffer)) | |
| 354 return false; | |
| 355 *output = buffer.toString(); | |
| 356 return true; | |
| 357 } | |
| 358 | |
| 359 std::unique_ptr<Value> buildValue(const UChar* start, const UChar* end, const UC
har** valueTokenEnd, int depth) | |
| 360 { | |
| 361 if (depth > stackLimit) | |
| 362 return nullptr; | |
| 363 | |
| 364 std::unique_ptr<Value> result; | |
| 365 const UChar* tokenStart; | |
| 366 const UChar* tokenEnd; | |
| 367 Token token = parseToken(start, end, &tokenStart, &tokenEnd); | |
| 368 switch (token) { | |
| 369 case InvalidToken: | |
| 370 return nullptr; | |
| 371 case NullToken: | |
| 372 result = Value::null(); | |
| 373 break; | |
| 374 case BoolTrue: | |
| 375 result = FundamentalValue::create(true); | |
| 376 break; | |
| 377 case BoolFalse: | |
| 378 result = FundamentalValue::create(false); | |
| 379 break; | |
| 380 case Number: { | |
| 381 bool ok; | |
| 382 double value = String16::charactersToDouble(tokenStart, tokenEnd - token
Start, &ok); | |
| 383 if (!ok) | |
| 384 return nullptr; | |
| 385 int number = static_cast<int>(value); | |
| 386 if (number == value) | |
| 387 result = FundamentalValue::create(number); | |
| 388 else | |
| 389 result = FundamentalValue::create(value); | |
| 390 break; | |
| 391 } | |
| 392 case StringLiteral: { | |
| 393 String16 value; | |
| 394 bool ok = decodeString(tokenStart + 1, tokenEnd - 1, &value); | |
| 395 if (!ok) | |
| 396 return nullptr; | |
| 397 result = StringValue::create(value); | |
| 398 break; | |
| 399 } | |
| 400 case ArrayBegin: { | |
| 401 std::unique_ptr<ListValue> array = ListValue::create(); | |
| 402 start = tokenEnd; | |
| 403 token = parseToken(start, end, &tokenStart, &tokenEnd); | |
| 404 while (token != ArrayEnd) { | |
| 405 std::unique_ptr<Value> arrayNode = buildValue(start, end, &tokenEnd,
depth + 1); | |
| 406 if (!arrayNode) | |
| 407 return nullptr; | |
| 408 array->pushValue(std::move(arrayNode)); | |
| 409 | |
| 410 // After a list value, we expect a comma or the end of the list. | |
| 411 start = tokenEnd; | |
| 412 token = parseToken(start, end, &tokenStart, &tokenEnd); | |
| 413 if (token == ListSeparator) { | |
| 414 start = tokenEnd; | |
| 415 token = parseToken(start, end, &tokenStart, &tokenEnd); | |
| 416 if (token == ArrayEnd) | |
| 417 return nullptr; | |
| 418 } else if (token != ArrayEnd) { | |
| 419 // Unexpected value after list value. Bail out. | |
| 420 return nullptr; | |
| 421 } | |
| 422 } | |
| 423 if (token != ArrayEnd) | |
| 424 return nullptr; | |
| 425 result = std::move(array); | |
| 426 break; | |
| 427 } | |
| 428 case ObjectBegin: { | |
| 429 std::unique_ptr<DictionaryValue> object = DictionaryValue::create(); | |
| 430 start = tokenEnd; | |
| 431 token = parseToken(start, end, &tokenStart, &tokenEnd); | |
| 432 while (token != ObjectEnd) { | |
| 433 if (token != StringLiteral) | |
| 434 return nullptr; | |
| 435 String16 key; | |
| 436 if (!decodeString(tokenStart + 1, tokenEnd - 1, &key)) | |
| 437 return nullptr; | |
| 438 start = tokenEnd; | |
| 439 | |
| 440 token = parseToken(start, end, &tokenStart, &tokenEnd); | |
| 441 if (token != ObjectPairSeparator) | |
| 442 return nullptr; | |
| 443 start = tokenEnd; | |
| 444 | |
| 445 std::unique_ptr<Value> value = buildValue(start, end, &tokenEnd, dep
th + 1); | |
| 446 if (!value) | |
| 447 return nullptr; | |
| 448 object->setValue(key, std::move(value)); | |
| 449 start = tokenEnd; | |
| 450 | |
| 451 // After a key/value pair, we expect a comma or the end of the | |
| 452 // object. | |
| 453 token = parseToken(start, end, &tokenStart, &tokenEnd); | |
| 454 if (token == ListSeparator) { | |
| 455 start = tokenEnd; | |
| 456 token = parseToken(start, end, &tokenStart, &tokenEnd); | |
| 457 if (token == ObjectEnd) | |
| 458 return nullptr; | |
| 459 } else if (token != ObjectEnd) { | |
| 460 // Unexpected value after last object value. Bail out. | |
| 461 return nullptr; | |
| 462 } | |
| 463 } | |
| 464 if (token != ObjectEnd) | |
| 465 return nullptr; | |
| 466 result = std::move(object); | |
| 467 break; | |
| 468 } | |
| 469 | |
| 470 default: | |
| 471 // We got a token that's not a value. | |
| 472 return nullptr; | |
| 473 } | |
| 474 | |
| 475 skipWhitespaceAndComments(tokenEnd, end, valueTokenEnd); | |
| 476 return result; | |
| 477 } | |
| 478 | |
| 479 std::unique_ptr<Value> parseJSONInternal(const UChar* start, unsigned length) | |
| 480 { | |
| 481 const UChar* end = start + length; | |
| 482 const UChar *tokenEnd; | |
| 483 std::unique_ptr<Value> value = buildValue(start, end, &tokenEnd, 0); | |
| 484 if (!value || tokenEnd != end) | |
| 485 return nullptr; | |
| 486 return value; | |
| 487 } | |
| 488 | |
| 489 } // anonymous namespace | |
| 490 | |
| 491 std::unique_ptr<Value> parseJSON(const String16& json) | |
| 492 { | |
| 493 if (json.isEmpty()) | |
| 494 return nullptr; | |
| 495 return parseJSONInternal(json.characters16(), json.length()); | |
| 496 } | |
| 497 | |
| 498 } // namespace protocol | |
| 499 } // namespace blink | |
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Chromium Code Reviews
Issue 2238423002:
[DevTools] Generate all files in inspector_protocol. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@2240663003