danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1 | // Copyright 2011 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #ifndef V8_JSON_PARSER_H_ |
| 29 | #define V8_JSON_PARSER_H_ |
| 30 | |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 31 | #include "v8.h" |
| 32 | |
| 33 | #include "char-predicates-inl.h" |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 34 | #include "v8conversions.h" |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 35 | #include "messages.h" |
| 36 | #include "spaces-inl.h" |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 37 | #include "token.h" |
| 38 | |
| 39 | namespace v8 { |
| 40 | namespace internal { |
| 41 | |
| 42 | // A simple json parser. |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 43 | template <bool seq_ascii> |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 44 | class JsonParser BASE_EMBEDDED { |
| 45 | public: |
| 46 | static Handle<Object> Parse(Handle<String> source) { |
| 47 | return JsonParser().ParseJson(source); |
| 48 | } |
| 49 | |
| 50 | static const int kEndOfString = -1; |
| 51 | |
| 52 | private: |
| 53 | // Parse a string containing a single JSON value. |
| 54 | Handle<Object> ParseJson(Handle<String> source); |
| 55 | |
| 56 | inline void Advance() { |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 57 | position_++; |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 58 | if (position_ >= source_length_) { |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 59 | c0_ = kEndOfString; |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 60 | } else if (seq_ascii) { |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 61 | c0_ = seq_source_->SeqAsciiStringGet(position_); |
| 62 | } else { |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 63 | c0_ = source_->Get(position_); |
| 64 | } |
| 65 | } |
| 66 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 67 | // The JSON lexical grammar is specified in the ECMAScript 5 standard, |
| 68 | // section 15.12.1.1. The only allowed whitespace characters between tokens |
| 69 | // are tab, carriage-return, newline and space. |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 70 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 71 | inline void AdvanceSkipWhitespace() { |
| 72 | do { |
| 73 | Advance(); |
| 74 | } while (c0_ == '\t' || c0_ == '\r' || c0_ == '\n' || c0_ == ' '); |
| 75 | } |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 76 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 77 | inline void SkipWhitespace() { |
| 78 | while (c0_ == '\t' || c0_ == '\r' || c0_ == '\n' || c0_ == ' ') { |
| 79 | Advance(); |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | inline uc32 AdvanceGetChar() { |
| 84 | Advance(); |
| 85 | return c0_; |
| 86 | } |
| 87 | |
| 88 | // Checks that current charater is c. |
| 89 | // If so, then consume c and skip whitespace. |
| 90 | inline bool MatchSkipWhiteSpace(uc32 c) { |
| 91 | if (c0_ == c) { |
| 92 | AdvanceSkipWhitespace(); |
| 93 | return true; |
| 94 | } |
| 95 | return false; |
| 96 | } |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 97 | |
| 98 | // A JSON string (production JSONString) is subset of valid JavaScript string |
| 99 | // literals. The string must only be double-quoted (not single-quoted), and |
| 100 | // the only allowed backslash-escapes are ", /, \, b, f, n, r, t and |
| 101 | // four-digit hex escapes (uXXXX). Any other use of backslashes is invalid. |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 102 | Handle<String> ParseJsonString() { |
| 103 | return ScanJsonString<false>(); |
| 104 | } |
| 105 | Handle<String> ParseJsonSymbol() { |
| 106 | return ScanJsonString<true>(); |
| 107 | } |
| 108 | template <bool is_symbol> |
| 109 | Handle<String> ScanJsonString(); |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 110 | // Creates a new string and copies prefix[start..end] into the beginning |
| 111 | // of it. Then scans the rest of the string, adding characters after the |
| 112 | // prefix. Called by ScanJsonString when reaching a '\' or non-ASCII char. |
| 113 | template <typename StringType, typename SinkChar> |
| 114 | Handle<String> SlowScanJsonString(Handle<String> prefix, int start, int end); |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 115 | |
| 116 | // A JSON number (production JSONNumber) is a subset of the valid JavaScript |
| 117 | // decimal number literals. |
| 118 | // It includes an optional minus sign, must have at least one |
| 119 | // digit before and after a decimal point, may not have prefixed zeros (unless |
| 120 | // the integer part is zero), and may include an exponent part (e.g., "e-10"). |
| 121 | // Hexadecimal and octal numbers are not allowed. |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 122 | Handle<Object> ParseJsonNumber(); |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 123 | |
| 124 | // Parse a single JSON value from input (grammar production JSONValue). |
| 125 | // A JSON value is either a (double-quoted) string literal, a number literal, |
| 126 | // one of "true", "false", or "null", or an object or array literal. |
| 127 | Handle<Object> ParseJsonValue(); |
| 128 | |
| 129 | // Parse a JSON object literal (grammar production JSONObject). |
| 130 | // An object literal is a squiggly-braced and comma separated sequence |
| 131 | // (possibly empty) of key/value pairs, where the key is a JSON string |
| 132 | // literal, the value is a JSON value, and the two are separated by a colon. |
| 133 | // A JSON array dosn't allow numbers and identifiers as keys, like a |
| 134 | // JavaScript array. |
| 135 | Handle<Object> ParseJsonObject(); |
| 136 | |
| 137 | // Parses a JSON array literal (grammar production JSONArray). An array |
| 138 | // literal is a square-bracketed and comma separated sequence (possibly empty) |
| 139 | // of JSON values. |
| 140 | // A JSON array doesn't allow leaving out values from the sequence, nor does |
| 141 | // it allow a terminal comma, like a JavaScript array does. |
| 142 | Handle<Object> ParseJsonArray(); |
| 143 | |
| 144 | |
| 145 | // Mark that a parsing error has happened at the current token, and |
| 146 | // return a null handle. Primarily for readability. |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 147 | inline Handle<Object> ReportUnexpectedCharacter() { |
| 148 | return Handle<Object>::null(); |
| 149 | } |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 150 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 151 | inline Isolate* isolate() { return isolate_; } |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 152 | |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 153 | static const int kInitialSpecialStringLength = 1024; |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 154 | |
| 155 | |
| 156 | private: |
| 157 | Handle<String> source_; |
| 158 | int source_length_; |
| 159 | Handle<SeqAsciiString> seq_source_; |
| 160 | |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 161 | Isolate* isolate_; |
| 162 | uc32 c0_; |
| 163 | int position_; |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 164 | }; |
| 165 | |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 166 | template <bool seq_ascii> |
| 167 | Handle<Object> JsonParser<seq_ascii>::ParseJson(Handle<String> source) { |
| 168 | isolate_ = source->map()->isolate(); |
ricow@chromium.org | 2c99e28 | 2011-07-28 09:15:17 +0000 | [diff] [blame] | 169 | FlattenString(source); |
| 170 | source_ = source; |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 171 | source_length_ = source_->length(); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 172 | |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 173 | // Optimized fast case where we only have ASCII characters. |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 174 | if (seq_ascii) { |
| 175 | seq_source_ = Handle<SeqAsciiString>::cast(source_); |
| 176 | } |
| 177 | |
| 178 | // Set initial position right before the string. |
| 179 | position_ = -1; |
| 180 | // Advance to the first character (posibly EOS) |
| 181 | AdvanceSkipWhitespace(); |
| 182 | Handle<Object> result = ParseJsonValue(); |
| 183 | if (result.is_null() || c0_ != kEndOfString) { |
| 184 | // Parse failed. Current character is the unexpected token. |
| 185 | |
| 186 | const char* message; |
| 187 | Factory* factory = isolate()->factory(); |
| 188 | Handle<JSArray> array; |
| 189 | |
| 190 | switch (c0_) { |
| 191 | case kEndOfString: |
| 192 | message = "unexpected_eos"; |
| 193 | array = factory->NewJSArray(0); |
| 194 | break; |
| 195 | case '-': |
| 196 | case '0': |
| 197 | case '1': |
| 198 | case '2': |
| 199 | case '3': |
| 200 | case '4': |
| 201 | case '5': |
| 202 | case '6': |
| 203 | case '7': |
| 204 | case '8': |
| 205 | case '9': |
| 206 | message = "unexpected_token_number"; |
| 207 | array = factory->NewJSArray(0); |
| 208 | break; |
| 209 | case '"': |
| 210 | message = "unexpected_token_string"; |
| 211 | array = factory->NewJSArray(0); |
| 212 | break; |
| 213 | default: |
| 214 | message = "unexpected_token"; |
| 215 | Handle<Object> name = LookupSingleCharacterStringFromCode(c0_); |
| 216 | Handle<FixedArray> element = factory->NewFixedArray(1); |
| 217 | element->set(0, *name); |
| 218 | array = factory->NewJSArrayWithElements(element); |
| 219 | break; |
| 220 | } |
| 221 | |
| 222 | MessageLocation location(factory->NewScript(source), |
| 223 | position_, |
| 224 | position_ + 1); |
| 225 | Handle<Object> result = factory->NewSyntaxError(message, array); |
| 226 | isolate()->Throw(*result, &location); |
| 227 | return Handle<Object>::null(); |
| 228 | } |
| 229 | return result; |
| 230 | } |
| 231 | |
| 232 | |
| 233 | // Parse any JSON value. |
| 234 | template <bool seq_ascii> |
| 235 | Handle<Object> JsonParser<seq_ascii>::ParseJsonValue() { |
| 236 | switch (c0_) { |
| 237 | case '"': |
| 238 | return ParseJsonString(); |
| 239 | case '-': |
| 240 | case '0': |
| 241 | case '1': |
| 242 | case '2': |
| 243 | case '3': |
| 244 | case '4': |
| 245 | case '5': |
| 246 | case '6': |
| 247 | case '7': |
| 248 | case '8': |
| 249 | case '9': |
| 250 | return ParseJsonNumber(); |
| 251 | case 'f': |
| 252 | if (AdvanceGetChar() == 'a' && AdvanceGetChar() == 'l' && |
| 253 | AdvanceGetChar() == 's' && AdvanceGetChar() == 'e') { |
| 254 | AdvanceSkipWhitespace(); |
| 255 | return isolate()->factory()->false_value(); |
| 256 | } else { |
| 257 | return ReportUnexpectedCharacter(); |
| 258 | } |
| 259 | case 't': |
| 260 | if (AdvanceGetChar() == 'r' && AdvanceGetChar() == 'u' && |
| 261 | AdvanceGetChar() == 'e') { |
| 262 | AdvanceSkipWhitespace(); |
| 263 | return isolate()->factory()->true_value(); |
| 264 | } else { |
| 265 | return ReportUnexpectedCharacter(); |
| 266 | } |
| 267 | case 'n': |
| 268 | if (AdvanceGetChar() == 'u' && AdvanceGetChar() == 'l' && |
| 269 | AdvanceGetChar() == 'l') { |
| 270 | AdvanceSkipWhitespace(); |
| 271 | return isolate()->factory()->null_value(); |
| 272 | } else { |
| 273 | return ReportUnexpectedCharacter(); |
| 274 | } |
| 275 | case '{': |
| 276 | return ParseJsonObject(); |
| 277 | case '[': |
| 278 | return ParseJsonArray(); |
| 279 | default: |
| 280 | return ReportUnexpectedCharacter(); |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | |
| 285 | // Parse a JSON object. Position must be right at '{'. |
| 286 | template <bool seq_ascii> |
| 287 | Handle<Object> JsonParser<seq_ascii>::ParseJsonObject() { |
| 288 | Handle<JSFunction> object_constructor( |
| 289 | isolate()->global_context()->object_function()); |
| 290 | Handle<JSObject> json_object = |
| 291 | isolate()->factory()->NewJSObject(object_constructor); |
| 292 | ASSERT_EQ(c0_, '{'); |
| 293 | |
| 294 | AdvanceSkipWhitespace(); |
| 295 | if (c0_ != '}') { |
| 296 | do { |
| 297 | if (c0_ != '"') return ReportUnexpectedCharacter(); |
| 298 | Handle<String> key = ParseJsonSymbol(); |
| 299 | if (key.is_null() || c0_ != ':') return ReportUnexpectedCharacter(); |
| 300 | AdvanceSkipWhitespace(); |
| 301 | Handle<Object> value = ParseJsonValue(); |
| 302 | if (value.is_null()) return ReportUnexpectedCharacter(); |
| 303 | |
| 304 | uint32_t index; |
| 305 | if (key->AsArrayIndex(&index)) { |
| 306 | SetOwnElement(json_object, index, value, kNonStrictMode); |
| 307 | } else if (key->Equals(isolate()->heap()->Proto_symbol())) { |
| 308 | SetPrototype(json_object, value); |
| 309 | } else { |
| 310 | SetLocalPropertyIgnoreAttributes(json_object, key, value, NONE); |
| 311 | } |
| 312 | } while (MatchSkipWhiteSpace(',')); |
| 313 | if (c0_ != '}') { |
| 314 | return ReportUnexpectedCharacter(); |
| 315 | } |
| 316 | } |
| 317 | AdvanceSkipWhitespace(); |
| 318 | return json_object; |
| 319 | } |
| 320 | |
| 321 | // Parse a JSON array. Position must be right at '['. |
| 322 | template <bool seq_ascii> |
| 323 | Handle<Object> JsonParser<seq_ascii>::ParseJsonArray() { |
| 324 | ZoneScope zone_scope(isolate(), DELETE_ON_EXIT); |
| 325 | ZoneList<Handle<Object> > elements(4); |
| 326 | ASSERT_EQ(c0_, '['); |
| 327 | |
| 328 | AdvanceSkipWhitespace(); |
| 329 | if (c0_ != ']') { |
| 330 | do { |
| 331 | Handle<Object> element = ParseJsonValue(); |
| 332 | if (element.is_null()) return ReportUnexpectedCharacter(); |
| 333 | elements.Add(element); |
| 334 | } while (MatchSkipWhiteSpace(',')); |
| 335 | if (c0_ != ']') { |
| 336 | return ReportUnexpectedCharacter(); |
| 337 | } |
| 338 | } |
| 339 | AdvanceSkipWhitespace(); |
| 340 | // Allocate a fixed array with all the elements. |
| 341 | Handle<FixedArray> fast_elements = |
| 342 | isolate()->factory()->NewFixedArray(elements.length()); |
| 343 | for (int i = 0, n = elements.length(); i < n; i++) { |
| 344 | fast_elements->set(i, *elements[i]); |
| 345 | } |
| 346 | return isolate()->factory()->NewJSArrayWithElements(fast_elements); |
| 347 | } |
| 348 | |
| 349 | |
| 350 | template <bool seq_ascii> |
| 351 | Handle<Object> JsonParser<seq_ascii>::ParseJsonNumber() { |
| 352 | bool negative = false; |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 353 | int beg_pos = position_; |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 354 | if (c0_ == '-') { |
| 355 | Advance(); |
| 356 | negative = true; |
| 357 | } |
| 358 | if (c0_ == '0') { |
| 359 | Advance(); |
| 360 | // Prefix zero is only allowed if it's the only digit before |
| 361 | // a decimal point or exponent. |
| 362 | if ('0' <= c0_ && c0_ <= '9') return ReportUnexpectedCharacter(); |
| 363 | } else { |
| 364 | int i = 0; |
| 365 | int digits = 0; |
| 366 | if (c0_ < '1' || c0_ > '9') return ReportUnexpectedCharacter(); |
| 367 | do { |
| 368 | i = i * 10 + c0_ - '0'; |
| 369 | digits++; |
| 370 | Advance(); |
| 371 | } while (c0_ >= '0' && c0_ <= '9'); |
| 372 | if (c0_ != '.' && c0_ != 'e' && c0_ != 'E' && digits < 10) { |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 373 | SkipWhitespace(); |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 374 | return Handle<Smi>(Smi::FromInt((negative ? -i : i)), isolate()); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 375 | } |
| 376 | } |
| 377 | if (c0_ == '.') { |
| 378 | Advance(); |
| 379 | if (c0_ < '0' || c0_ > '9') return ReportUnexpectedCharacter(); |
| 380 | do { |
| 381 | Advance(); |
| 382 | } while (c0_ >= '0' && c0_ <= '9'); |
| 383 | } |
| 384 | if (AsciiAlphaToLower(c0_) == 'e') { |
| 385 | Advance(); |
| 386 | if (c0_ == '-' || c0_ == '+') Advance(); |
| 387 | if (c0_ < '0' || c0_ > '9') return ReportUnexpectedCharacter(); |
| 388 | do { |
| 389 | Advance(); |
| 390 | } while (c0_ >= '0' && c0_ <= '9'); |
| 391 | } |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 392 | int length = position_ - beg_pos; |
| 393 | double number; |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 394 | if (seq_ascii) { |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 395 | Vector<const char> chars(seq_source_->GetChars() + beg_pos, length); |
| 396 | number = StringToDouble(isolate()->unicode_cache(), |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 397 | chars, |
| 398 | NO_FLAGS, // Hex, octal or trailing junk. |
| 399 | OS::nan_value()); |
| 400 | } else { |
| 401 | Vector<char> buffer = Vector<char>::New(length); |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 402 | String::WriteToFlat(*source_, buffer.start(), beg_pos, position_); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 403 | Vector<const char> result = |
| 404 | Vector<const char>(reinterpret_cast<const char*>(buffer.start()), |
| 405 | length); |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 406 | number = StringToDouble(isolate()->unicode_cache(), |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 407 | result, |
| 408 | NO_FLAGS, // Hex, octal or trailing junk. |
| 409 | 0.0); |
| 410 | buffer.Dispose(); |
| 411 | } |
| 412 | SkipWhitespace(); |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 413 | return isolate()->factory()->NewNumber(number); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 414 | } |
| 415 | |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 416 | |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 417 | template <typename StringType> |
| 418 | inline void SeqStringSet(Handle<StringType> seq_str, int i, uc32 c); |
| 419 | |
| 420 | template <> |
| 421 | inline void SeqStringSet(Handle<SeqTwoByteString> seq_str, int i, uc32 c) { |
| 422 | seq_str->SeqTwoByteStringSet(i, c); |
| 423 | } |
| 424 | |
| 425 | template <> |
| 426 | inline void SeqStringSet(Handle<SeqAsciiString> seq_str, int i, uc32 c) { |
| 427 | seq_str->SeqAsciiStringSet(i, c); |
| 428 | } |
| 429 | |
| 430 | template <typename StringType> |
| 431 | inline Handle<StringType> NewRawString(Factory* factory, int length); |
| 432 | |
| 433 | template <> |
| 434 | inline Handle<SeqTwoByteString> NewRawString(Factory* factory, int length) { |
| 435 | return factory->NewRawTwoByteString(length, NOT_TENURED); |
| 436 | } |
| 437 | |
| 438 | template <> |
| 439 | inline Handle<SeqAsciiString> NewRawString(Factory* factory, int length) { |
| 440 | return factory->NewRawAsciiString(length, NOT_TENURED); |
| 441 | } |
| 442 | |
| 443 | |
| 444 | // Scans the rest of a JSON string starting from position_ and writes |
| 445 | // prefix[start..end] along with the scanned characters into a |
| 446 | // sequential string of type StringType. |
| 447 | template <bool seq_ascii> |
| 448 | template <typename StringType, typename SinkChar> |
| 449 | Handle<String> JsonParser<seq_ascii>::SlowScanJsonString( |
| 450 | Handle<String> prefix, int start, int end) { |
| 451 | int count = end - start; |
| 452 | int max_length = count + source_length_ - position_; |
| 453 | int length = Min(max_length, Max(kInitialSpecialStringLength, 2 * count)); |
| 454 | Handle<StringType> seq_str = NewRawString<StringType>(isolate()->factory(), |
| 455 | length); |
| 456 | // Copy prefix into seq_str. |
| 457 | SinkChar* dest = seq_str->GetChars(); |
| 458 | String::WriteToFlat(*prefix, dest, start, end); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 459 | |
| 460 | while (c0_ != '"') { |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 461 | // Check for control character (0x00-0x1f) or unterminated string (<0). |
| 462 | if (c0_ < 0x20) return Handle<String>::null(); |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 463 | if (count >= length) { |
| 464 | // We need to create a longer sequential string for the result. |
| 465 | return SlowScanJsonString<StringType, SinkChar>(seq_str, 0, count); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 466 | } |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 467 | if (c0_ != '\\') { |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 468 | // If the sink can contain UC16 characters, or source_ contains only |
| 469 | // ASCII characters, there's no need to test whether we can store the |
| 470 | // character. Otherwise check whether the UC16 source character can fit |
| 471 | // in the ASCII sink. |
| 472 | if (sizeof(SinkChar) == kUC16Size || |
| 473 | seq_ascii || |
| 474 | c0_ <= kMaxAsciiCharCode) { |
| 475 | SeqStringSet(seq_str, count++, c0_); |
| 476 | Advance(); |
| 477 | } else { |
| 478 | // StringType is SeqAsciiString and we just read a non-ASCII char. |
| 479 | return SlowScanJsonString<SeqTwoByteString, uc16>(seq_str, 0, count); |
| 480 | } |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 481 | } else { |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 482 | Advance(); // Advance past the \. |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 483 | switch (c0_) { |
| 484 | case '"': |
| 485 | case '\\': |
| 486 | case '/': |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 487 | SeqStringSet(seq_str, count++, c0_); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 488 | break; |
| 489 | case 'b': |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 490 | SeqStringSet(seq_str, count++, '\x08'); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 491 | break; |
| 492 | case 'f': |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 493 | SeqStringSet(seq_str, count++, '\x0c'); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 494 | break; |
| 495 | case 'n': |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 496 | SeqStringSet(seq_str, count++, '\x0a'); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 497 | break; |
| 498 | case 'r': |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 499 | SeqStringSet(seq_str, count++, '\x0d'); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 500 | break; |
| 501 | case 't': |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 502 | SeqStringSet(seq_str, count++, '\x09'); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 503 | break; |
| 504 | case 'u': { |
| 505 | uc32 value = 0; |
| 506 | for (int i = 0; i < 4; i++) { |
| 507 | Advance(); |
| 508 | int digit = HexValue(c0_); |
| 509 | if (digit < 0) { |
| 510 | return Handle<String>::null(); |
| 511 | } |
| 512 | value = value * 16 + digit; |
| 513 | } |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 514 | if (sizeof(SinkChar) == kUC16Size || value <= kMaxAsciiCharCode) { |
| 515 | SeqStringSet(seq_str, count++, value); |
| 516 | break; |
| 517 | } else { |
| 518 | // StringType is SeqAsciiString and we just read a non-ASCII char. |
| 519 | position_ -= 6; // Rewind position_ to \ in \uxxxx. |
| 520 | Advance(); |
| 521 | return SlowScanJsonString<SeqTwoByteString, uc16>(seq_str, |
| 522 | 0, |
| 523 | count); |
| 524 | } |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 525 | } |
| 526 | default: |
| 527 | return Handle<String>::null(); |
| 528 | } |
| 529 | Advance(); |
| 530 | } |
| 531 | } |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 532 | // Shrink seq_string length to count. |
| 533 | if (isolate()->heap()->InNewSpace(*seq_str)) { |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 534 | isolate()->heap()->new_space()-> |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 535 | template ShrinkStringAtAllocationBoundary<StringType>( |
| 536 | *seq_str, count); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 537 | } else { |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 538 | int string_size = StringType::SizeFor(count); |
| 539 | int allocated_string_size = StringType::SizeFor(length); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 540 | int delta = allocated_string_size - string_size; |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 541 | Address start_filler_object = seq_str->address() + string_size; |
| 542 | seq_str->set_length(count); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 543 | isolate()->heap()->CreateFillerObjectAt(start_filler_object, delta); |
| 544 | } |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 545 | ASSERT_EQ('"', c0_); |
| 546 | // Advance past the last '"'. |
| 547 | AdvanceSkipWhitespace(); |
| 548 | return seq_str; |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 549 | } |
| 550 | |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 551 | |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 552 | template <bool seq_ascii> |
| 553 | template <bool is_symbol> |
| 554 | Handle<String> JsonParser<seq_ascii>::ScanJsonString() { |
| 555 | ASSERT_EQ('"', c0_); |
| 556 | Advance(); |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 557 | if (c0_ == '"') { |
| 558 | AdvanceSkipWhitespace(); |
| 559 | return Handle<String>(isolate()->heap()->empty_string()); |
| 560 | } |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 561 | int beg_pos = position_; |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 562 | // Fast case for ASCII only without escape characters. |
| 563 | do { |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 564 | // Check for control character (0x00-0x1f) or unterminated string (<0). |
| 565 | if (c0_ < 0x20) return Handle<String>::null(); |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 566 | if (c0_ != '\\') { |
| 567 | if (seq_ascii || c0_ <= kMaxAsciiCharCode) { |
| 568 | Advance(); |
| 569 | } else { |
| 570 | return SlowScanJsonString<SeqTwoByteString, uc16>(source_, |
| 571 | beg_pos, |
| 572 | position_); |
| 573 | } |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 574 | } else { |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 575 | return SlowScanJsonString<SeqAsciiString, char>(source_, |
| 576 | beg_pos, |
| 577 | position_); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 578 | } |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 579 | } while (c0_ != '"'); |
| 580 | int length = position_ - beg_pos; |
| 581 | Handle<String> result; |
| 582 | if (seq_ascii && is_symbol) { |
| 583 | result = isolate()->factory()->LookupAsciiSymbol(seq_source_, |
| 584 | beg_pos, |
| 585 | length); |
| 586 | } else { |
| 587 | result = isolate()->factory()->NewRawAsciiString(length); |
| 588 | char* dest = SeqAsciiString::cast(*result)->GetChars(); |
| 589 | String::WriteToFlat(*source_, dest, beg_pos, position_); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 590 | } |
| 591 | ASSERT_EQ('"', c0_); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 592 | // Advance past the last '"'. |
| 593 | AdvanceSkipWhitespace(); |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 594 | return result; |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 595 | } |
| 596 | |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 597 | } } // namespace v8::internal |
| 598 | |
| 599 | #endif // V8_JSON_PARSER_H_ |