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599 lines
20 KiB
599 lines
20 KiB
// Copyright 2011 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_JSON_PARSER_H_
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#define V8_JSON_PARSER_H_
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#include "v8.h"
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#include "char-predicates-inl.h"
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#include "v8conversions.h"
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#include "messages.h"
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#include "spaces-inl.h"
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#include "token.h"
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namespace v8 {
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namespace internal {
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// A simple json parser.
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template <bool seq_ascii>
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class JsonParser BASE_EMBEDDED {
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public:
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static Handle<Object> Parse(Handle<String> source) {
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return JsonParser().ParseJson(source);
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}
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static const int kEndOfString = -1;
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private:
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// Parse a string containing a single JSON value.
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Handle<Object> ParseJson(Handle<String> source);
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inline void Advance() {
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position_++;
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if (position_ >= source_length_) {
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c0_ = kEndOfString;
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} else if (seq_ascii) {
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c0_ = seq_source_->SeqAsciiStringGet(position_);
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} else {
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c0_ = source_->Get(position_);
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}
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}
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// The JSON lexical grammar is specified in the ECMAScript 5 standard,
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// section 15.12.1.1. The only allowed whitespace characters between tokens
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// are tab, carriage-return, newline and space.
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inline void AdvanceSkipWhitespace() {
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do {
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Advance();
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} while (c0_ == '\t' || c0_ == '\r' || c0_ == '\n' || c0_ == ' ');
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}
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inline void SkipWhitespace() {
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while (c0_ == '\t' || c0_ == '\r' || c0_ == '\n' || c0_ == ' ') {
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Advance();
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}
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}
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inline uc32 AdvanceGetChar() {
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Advance();
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return c0_;
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}
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// Checks that current charater is c.
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// If so, then consume c and skip whitespace.
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inline bool MatchSkipWhiteSpace(uc32 c) {
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if (c0_ == c) {
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AdvanceSkipWhitespace();
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return true;
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}
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return false;
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}
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// A JSON string (production JSONString) is subset of valid JavaScript string
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// literals. The string must only be double-quoted (not single-quoted), and
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// the only allowed backslash-escapes are ", /, \, b, f, n, r, t and
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// four-digit hex escapes (uXXXX). Any other use of backslashes is invalid.
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Handle<String> ParseJsonString() {
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return ScanJsonString<false>();
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}
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Handle<String> ParseJsonSymbol() {
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return ScanJsonString<true>();
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}
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template <bool is_symbol>
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Handle<String> ScanJsonString();
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// Creates a new string and copies prefix[start..end] into the beginning
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// of it. Then scans the rest of the string, adding characters after the
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// prefix. Called by ScanJsonString when reaching a '\' or non-ASCII char.
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template <typename StringType, typename SinkChar>
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Handle<String> SlowScanJsonString(Handle<String> prefix, int start, int end);
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// A JSON number (production JSONNumber) is a subset of the valid JavaScript
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// decimal number literals.
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// It includes an optional minus sign, must have at least one
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// digit before and after a decimal point, may not have prefixed zeros (unless
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// the integer part is zero), and may include an exponent part (e.g., "e-10").
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// Hexadecimal and octal numbers are not allowed.
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Handle<Object> ParseJsonNumber();
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// Parse a single JSON value from input (grammar production JSONValue).
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// A JSON value is either a (double-quoted) string literal, a number literal,
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// one of "true", "false", or "null", or an object or array literal.
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Handle<Object> ParseJsonValue();
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// Parse a JSON object literal (grammar production JSONObject).
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// An object literal is a squiggly-braced and comma separated sequence
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// (possibly empty) of key/value pairs, where the key is a JSON string
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// literal, the value is a JSON value, and the two are separated by a colon.
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// A JSON array dosn't allow numbers and identifiers as keys, like a
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// JavaScript array.
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Handle<Object> ParseJsonObject();
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// Parses a JSON array literal (grammar production JSONArray). An array
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// literal is a square-bracketed and comma separated sequence (possibly empty)
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// of JSON values.
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// A JSON array doesn't allow leaving out values from the sequence, nor does
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// it allow a terminal comma, like a JavaScript array does.
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Handle<Object> ParseJsonArray();
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// Mark that a parsing error has happened at the current token, and
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// return a null handle. Primarily for readability.
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inline Handle<Object> ReportUnexpectedCharacter() {
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return Handle<Object>::null();
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}
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inline Isolate* isolate() { return isolate_; }
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static const int kInitialSpecialStringLength = 1024;
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private:
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Handle<String> source_;
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int source_length_;
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Handle<SeqAsciiString> seq_source_;
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Isolate* isolate_;
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uc32 c0_;
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int position_;
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};
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template <bool seq_ascii>
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Handle<Object> JsonParser<seq_ascii>::ParseJson(Handle<String> source) {
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isolate_ = source->map()->GetHeap()->isolate();
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FlattenString(source);
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source_ = source;
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source_length_ = source_->length();
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// Optimized fast case where we only have ASCII characters.
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if (seq_ascii) {
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seq_source_ = Handle<SeqAsciiString>::cast(source_);
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}
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// Set initial position right before the string.
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position_ = -1;
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// Advance to the first character (posibly EOS)
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AdvanceSkipWhitespace();
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Handle<Object> result = ParseJsonValue();
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if (result.is_null() || c0_ != kEndOfString) {
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// Parse failed. Current character is the unexpected token.
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const char* message;
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Factory* factory = isolate()->factory();
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Handle<JSArray> array;
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switch (c0_) {
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case kEndOfString:
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message = "unexpected_eos";
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array = factory->NewJSArray(0);
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break;
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case '-':
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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message = "unexpected_token_number";
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array = factory->NewJSArray(0);
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break;
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case '"':
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message = "unexpected_token_string";
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array = factory->NewJSArray(0);
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break;
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default:
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message = "unexpected_token";
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Handle<Object> name = LookupSingleCharacterStringFromCode(c0_);
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Handle<FixedArray> element = factory->NewFixedArray(1);
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element->set(0, *name);
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array = factory->NewJSArrayWithElements(element);
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break;
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}
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MessageLocation location(factory->NewScript(source),
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position_,
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position_ + 1);
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Handle<Object> result = factory->NewSyntaxError(message, array);
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isolate()->Throw(*result, &location);
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return Handle<Object>::null();
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}
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return result;
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}
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// Parse any JSON value.
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template <bool seq_ascii>
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Handle<Object> JsonParser<seq_ascii>::ParseJsonValue() {
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switch (c0_) {
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case '"':
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return ParseJsonString();
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case '-':
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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return ParseJsonNumber();
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case 'f':
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if (AdvanceGetChar() == 'a' && AdvanceGetChar() == 'l' &&
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AdvanceGetChar() == 's' && AdvanceGetChar() == 'e') {
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AdvanceSkipWhitespace();
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return isolate()->factory()->false_value();
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} else {
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return ReportUnexpectedCharacter();
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}
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case 't':
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if (AdvanceGetChar() == 'r' && AdvanceGetChar() == 'u' &&
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AdvanceGetChar() == 'e') {
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AdvanceSkipWhitespace();
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return isolate()->factory()->true_value();
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} else {
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return ReportUnexpectedCharacter();
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}
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case 'n':
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if (AdvanceGetChar() == 'u' && AdvanceGetChar() == 'l' &&
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AdvanceGetChar() == 'l') {
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AdvanceSkipWhitespace();
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return isolate()->factory()->null_value();
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} else {
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return ReportUnexpectedCharacter();
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}
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case '{':
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return ParseJsonObject();
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case '[':
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return ParseJsonArray();
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default:
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return ReportUnexpectedCharacter();
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}
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}
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// Parse a JSON object. Position must be right at '{'.
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template <bool seq_ascii>
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Handle<Object> JsonParser<seq_ascii>::ParseJsonObject() {
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Handle<JSFunction> object_constructor(
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isolate()->global_context()->object_function());
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Handle<JSObject> json_object =
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isolate()->factory()->NewJSObject(object_constructor);
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ASSERT_EQ(c0_, '{');
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AdvanceSkipWhitespace();
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if (c0_ != '}') {
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do {
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if (c0_ != '"') return ReportUnexpectedCharacter();
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Handle<String> key = ParseJsonSymbol();
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if (key.is_null() || c0_ != ':') return ReportUnexpectedCharacter();
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AdvanceSkipWhitespace();
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Handle<Object> value = ParseJsonValue();
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if (value.is_null()) return ReportUnexpectedCharacter();
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uint32_t index;
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if (key->AsArrayIndex(&index)) {
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SetOwnElement(json_object, index, value, kNonStrictMode);
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} else if (key->Equals(isolate()->heap()->Proto_symbol())) {
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SetPrototype(json_object, value);
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} else {
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SetLocalPropertyIgnoreAttributes(json_object, key, value, NONE);
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}
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} while (MatchSkipWhiteSpace(','));
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if (c0_ != '}') {
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return ReportUnexpectedCharacter();
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}
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}
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AdvanceSkipWhitespace();
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return json_object;
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}
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// Parse a JSON array. Position must be right at '['.
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template <bool seq_ascii>
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Handle<Object> JsonParser<seq_ascii>::ParseJsonArray() {
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ZoneScope zone_scope(isolate(), DELETE_ON_EXIT);
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ZoneList<Handle<Object> > elements(4);
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ASSERT_EQ(c0_, '[');
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AdvanceSkipWhitespace();
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if (c0_ != ']') {
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do {
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Handle<Object> element = ParseJsonValue();
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if (element.is_null()) return ReportUnexpectedCharacter();
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elements.Add(element);
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} while (MatchSkipWhiteSpace(','));
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if (c0_ != ']') {
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return ReportUnexpectedCharacter();
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}
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}
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AdvanceSkipWhitespace();
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// Allocate a fixed array with all the elements.
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Handle<FixedArray> fast_elements =
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isolate()->factory()->NewFixedArray(elements.length());
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for (int i = 0, n = elements.length(); i < n; i++) {
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fast_elements->set(i, *elements[i]);
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}
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return isolate()->factory()->NewJSArrayWithElements(fast_elements);
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}
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template <bool seq_ascii>
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Handle<Object> JsonParser<seq_ascii>::ParseJsonNumber() {
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bool negative = false;
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int beg_pos = position_;
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if (c0_ == '-') {
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Advance();
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negative = true;
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}
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if (c0_ == '0') {
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Advance();
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// Prefix zero is only allowed if it's the only digit before
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// a decimal point or exponent.
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if ('0' <= c0_ && c0_ <= '9') return ReportUnexpectedCharacter();
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} else {
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int i = 0;
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int digits = 0;
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if (c0_ < '1' || c0_ > '9') return ReportUnexpectedCharacter();
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do {
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i = i * 10 + c0_ - '0';
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digits++;
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Advance();
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} while (c0_ >= '0' && c0_ <= '9');
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if (c0_ != '.' && c0_ != 'e' && c0_ != 'E' && digits < 10) {
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SkipWhitespace();
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return Handle<Smi>(Smi::FromInt((negative ? -i : i)), isolate());
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}
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}
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if (c0_ == '.') {
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Advance();
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if (c0_ < '0' || c0_ > '9') return ReportUnexpectedCharacter();
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do {
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Advance();
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} while (c0_ >= '0' && c0_ <= '9');
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}
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if (AsciiAlphaToLower(c0_) == 'e') {
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Advance();
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if (c0_ == '-' || c0_ == '+') Advance();
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if (c0_ < '0' || c0_ > '9') return ReportUnexpectedCharacter();
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do {
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Advance();
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} while (c0_ >= '0' && c0_ <= '9');
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}
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int length = position_ - beg_pos;
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double number;
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if (seq_ascii) {
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Vector<const char> chars(seq_source_->GetChars() + beg_pos, length);
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number = StringToDouble(isolate()->unicode_cache(),
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chars,
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NO_FLAGS, // Hex, octal or trailing junk.
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OS::nan_value());
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} else {
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Vector<char> buffer = Vector<char>::New(length);
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String::WriteToFlat(*source_, buffer.start(), beg_pos, position_);
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Vector<const char> result =
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Vector<const char>(reinterpret_cast<const char*>(buffer.start()),
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length);
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number = StringToDouble(isolate()->unicode_cache(),
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result,
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NO_FLAGS, // Hex, octal or trailing junk.
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0.0);
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buffer.Dispose();
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}
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SkipWhitespace();
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return isolate()->factory()->NewNumber(number);
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}
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template <typename StringType>
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inline void SeqStringSet(Handle<StringType> seq_str, int i, uc32 c);
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template <>
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inline void SeqStringSet(Handle<SeqTwoByteString> seq_str, int i, uc32 c) {
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seq_str->SeqTwoByteStringSet(i, c);
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}
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template <>
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inline void SeqStringSet(Handle<SeqAsciiString> seq_str, int i, uc32 c) {
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seq_str->SeqAsciiStringSet(i, c);
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}
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template <typename StringType>
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inline Handle<StringType> NewRawString(Factory* factory, int length);
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template <>
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inline Handle<SeqTwoByteString> NewRawString(Factory* factory, int length) {
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return factory->NewRawTwoByteString(length, NOT_TENURED);
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}
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template <>
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inline Handle<SeqAsciiString> NewRawString(Factory* factory, int length) {
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return factory->NewRawAsciiString(length, NOT_TENURED);
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}
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// Scans the rest of a JSON string starting from position_ and writes
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// prefix[start..end] along with the scanned characters into a
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// sequential string of type StringType.
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template <bool seq_ascii>
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template <typename StringType, typename SinkChar>
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Handle<String> JsonParser<seq_ascii>::SlowScanJsonString(
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Handle<String> prefix, int start, int end) {
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int count = end - start;
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int max_length = count + source_length_ - position_;
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int length = Min(max_length, Max(kInitialSpecialStringLength, 2 * count));
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Handle<StringType> seq_str = NewRawString<StringType>(isolate()->factory(),
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length);
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// Copy prefix into seq_str.
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SinkChar* dest = seq_str->GetChars();
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String::WriteToFlat(*prefix, dest, start, end);
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while (c0_ != '"') {
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// Check for control character (0x00-0x1f) or unterminated string (<0).
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if (c0_ < 0x20) return Handle<String>::null();
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if (count >= length) {
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// We need to create a longer sequential string for the result.
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return SlowScanJsonString<StringType, SinkChar>(seq_str, 0, count);
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}
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if (c0_ != '\\') {
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// If the sink can contain UC16 characters, or source_ contains only
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// ASCII characters, there's no need to test whether we can store the
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// character. Otherwise check whether the UC16 source character can fit
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// in the ASCII sink.
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if (sizeof(SinkChar) == kUC16Size ||
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seq_ascii ||
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c0_ <= kMaxAsciiCharCode) {
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SeqStringSet(seq_str, count++, c0_);
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Advance();
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} else {
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// StringType is SeqAsciiString and we just read a non-ASCII char.
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return SlowScanJsonString<SeqTwoByteString, uc16>(seq_str, 0, count);
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}
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} else {
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Advance(); // Advance past the \.
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switch (c0_) {
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case '"':
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case '\\':
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case '/':
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SeqStringSet(seq_str, count++, c0_);
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break;
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case 'b':
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SeqStringSet(seq_str, count++, '\x08');
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break;
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case 'f':
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SeqStringSet(seq_str, count++, '\x0c');
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break;
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case 'n':
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SeqStringSet(seq_str, count++, '\x0a');
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break;
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case 'r':
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SeqStringSet(seq_str, count++, '\x0d');
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break;
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case 't':
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SeqStringSet(seq_str, count++, '\x09');
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break;
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case 'u': {
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uc32 value = 0;
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for (int i = 0; i < 4; i++) {
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Advance();
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int digit = HexValue(c0_);
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if (digit < 0) {
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return Handle<String>::null();
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}
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value = value * 16 + digit;
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|
}
|
|
if (sizeof(SinkChar) == kUC16Size || value <= kMaxAsciiCharCode) {
|
|
SeqStringSet(seq_str, count++, value);
|
|
break;
|
|
} else {
|
|
// StringType is SeqAsciiString and we just read a non-ASCII char.
|
|
position_ -= 6; // Rewind position_ to \ in \uxxxx.
|
|
Advance();
|
|
return SlowScanJsonString<SeqTwoByteString, uc16>(seq_str,
|
|
0,
|
|
count);
|
|
}
|
|
}
|
|
default:
|
|
return Handle<String>::null();
|
|
}
|
|
Advance();
|
|
}
|
|
}
|
|
// Shrink seq_string length to count.
|
|
if (isolate()->heap()->InNewSpace(*seq_str)) {
|
|
isolate()->heap()->new_space()->
|
|
template ShrinkStringAtAllocationBoundary<StringType>(
|
|
*seq_str, count);
|
|
} else {
|
|
int string_size = StringType::SizeFor(count);
|
|
int allocated_string_size = StringType::SizeFor(length);
|
|
int delta = allocated_string_size - string_size;
|
|
Address start_filler_object = seq_str->address() + string_size;
|
|
seq_str->set_length(count);
|
|
isolate()->heap()->CreateFillerObjectAt(start_filler_object, delta);
|
|
}
|
|
ASSERT_EQ('"', c0_);
|
|
// Advance past the last '"'.
|
|
AdvanceSkipWhitespace();
|
|
return seq_str;
|
|
}
|
|
|
|
|
|
template <bool seq_ascii>
|
|
template <bool is_symbol>
|
|
Handle<String> JsonParser<seq_ascii>::ScanJsonString() {
|
|
ASSERT_EQ('"', c0_);
|
|
Advance();
|
|
if (c0_ == '"') {
|
|
AdvanceSkipWhitespace();
|
|
return Handle<String>(isolate()->heap()->empty_string());
|
|
}
|
|
int beg_pos = position_;
|
|
// Fast case for ASCII only without escape characters.
|
|
do {
|
|
// Check for control character (0x00-0x1f) or unterminated string (<0).
|
|
if (c0_ < 0x20) return Handle<String>::null();
|
|
if (c0_ != '\\') {
|
|
if (seq_ascii || c0_ <= kMaxAsciiCharCode) {
|
|
Advance();
|
|
} else {
|
|
return SlowScanJsonString<SeqTwoByteString, uc16>(source_,
|
|
beg_pos,
|
|
position_);
|
|
}
|
|
} else {
|
|
return SlowScanJsonString<SeqAsciiString, char>(source_,
|
|
beg_pos,
|
|
position_);
|
|
}
|
|
} while (c0_ != '"');
|
|
int length = position_ - beg_pos;
|
|
Handle<String> result;
|
|
if (seq_ascii && is_symbol) {
|
|
result = isolate()->factory()->LookupAsciiSymbol(seq_source_,
|
|
beg_pos,
|
|
length);
|
|
} else {
|
|
result = isolate()->factory()->NewRawAsciiString(length);
|
|
char* dest = SeqAsciiString::cast(*result)->GetChars();
|
|
String::WriteToFlat(*source_, dest, beg_pos, position_);
|
|
}
|
|
ASSERT_EQ('"', c0_);
|
|
// Advance past the last '"'.
|
|
AdvanceSkipWhitespace();
|
|
return result;
|
|
}
|
|
|
|
} } // namespace v8::internal
|
|
|
|
#endif // V8_JSON_PARSER_H_
|
|
|