// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/json-stringifier.h"
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#include "src/conversions.h"
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#include "src/heap/heap-inl.h"
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#include "src/lookup.h"
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#include "src/messages.h"
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#include "src/objects-inl.h"
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#include "src/objects/js-array-inl.h"
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#include "src/string-builder-inl.h"
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#include "src/utils.h"
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namespace v8 {
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namespace internal {
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class JsonStringifier BASE_EMBEDDED {
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public:
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explicit JsonStringifier(Isolate* isolate);
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~JsonStringifier() { DeleteArray(gap_); }
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V8_WARN_UNUSED_RESULT MaybeHandle<Object> Stringify(Handle<Object> object,
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Handle<Object> replacer,
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Handle<Object> gap);
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private:
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enum Result { UNCHANGED, SUCCESS, EXCEPTION };
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bool InitializeReplacer(Handle<Object> replacer);
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bool InitializeGap(Handle<Object> gap);
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V8_WARN_UNUSED_RESULT MaybeHandle<Object> ApplyToJsonFunction(
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Handle<Object> object, Handle<Object> key);
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V8_WARN_UNUSED_RESULT MaybeHandle<Object> ApplyReplacerFunction(
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Handle<Object> value, Handle<Object> key, Handle<Object> initial_holder);
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// Entry point to serialize the object.
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V8_INLINE Result SerializeObject(Handle<Object> obj) {
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return Serialize_<false>(obj, false, factory()->empty_string());
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}
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// Serialize an array element.
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// The index may serve as argument for the toJSON function.
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V8_INLINE Result SerializeElement(Isolate* isolate, Handle<Object> object,
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int i) {
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return Serialize_<false>(object, false,
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Handle<Object>(Smi::FromInt(i), isolate));
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}
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// Serialize a object property.
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// The key may or may not be serialized depending on the property.
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// The key may also serve as argument for the toJSON function.
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V8_INLINE Result SerializeProperty(Handle<Object> object, bool deferred_comma,
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Handle<String> deferred_key) {
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DCHECK(!deferred_key.is_null());
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return Serialize_<true>(object, deferred_comma, deferred_key);
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}
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template <bool deferred_string_key>
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Result Serialize_(Handle<Object> object, bool comma, Handle<Object> key);
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V8_INLINE void SerializeDeferredKey(bool deferred_comma,
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Handle<Object> deferred_key);
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Result SerializeSmi(Smi* object);
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Result SerializeDouble(double number);
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V8_INLINE Result SerializeHeapNumber(Handle<HeapNumber> object) {
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return SerializeDouble(object->value());
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}
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Result SerializeJSValue(Handle<JSValue> object);
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V8_INLINE Result SerializeJSArray(Handle<JSArray> object);
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V8_INLINE Result SerializeJSObject(Handle<JSObject> object);
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Result SerializeJSProxy(Handle<JSProxy> object);
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Result SerializeJSReceiverSlow(Handle<JSReceiver> object);
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Result SerializeArrayLikeSlow(Handle<JSReceiver> object, uint32_t start,
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uint32_t length);
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void SerializeString(Handle<String> object);
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template <typename SrcChar, typename DestChar>
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V8_INLINE static void SerializeStringUnchecked_(
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Vector<const SrcChar> src,
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IncrementalStringBuilder::NoExtend<DestChar>* dest);
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template <typename SrcChar, typename DestChar>
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V8_INLINE void SerializeString_(Handle<String> string);
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template <typename Char>
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V8_INLINE static bool DoNotEscape(Char c);
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V8_INLINE void NewLine();
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V8_INLINE void Indent() { indent_++; }
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V8_INLINE void Unindent() { indent_--; }
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V8_INLINE void Separator(bool first);
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Handle<JSReceiver> CurrentHolder(Handle<Object> value,
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Handle<Object> inital_holder);
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Result StackPush(Handle<Object> object);
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void StackPop();
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Factory* factory() { return isolate_->factory(); }
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Isolate* isolate_;
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IncrementalStringBuilder builder_;
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Handle<String> tojson_string_;
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Handle<JSArray> stack_;
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Handle<FixedArray> property_list_;
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Handle<JSReceiver> replacer_function_;
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uc16* gap_;
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int indent_;
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static const int kJsonEscapeTableEntrySize = 8;
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static const char* const JsonEscapeTable;
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};
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MaybeHandle<Object> JsonStringify(Isolate* isolate, Handle<Object> object,
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Handle<Object> replacer, Handle<Object> gap) {
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JsonStringifier stringifier(isolate);
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return stringifier.Stringify(object, replacer, gap);
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}
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// Translation table to escape Latin1 characters.
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// Table entries start at a multiple of 8 and are null-terminated.
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const char* const JsonStringifier::JsonEscapeTable =
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"\\u0000\0 \\u0001\0 \\u0002\0 \\u0003\0 "
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"\\u0004\0 \\u0005\0 \\u0006\0 \\u0007\0 "
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"\\b\0 \\t\0 \\n\0 \\u000b\0 "
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"\\f\0 \\r\0 \\u000e\0 \\u000f\0 "
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"\\u0010\0 \\u0011\0 \\u0012\0 \\u0013\0 "
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"\\u0014\0 \\u0015\0 \\u0016\0 \\u0017\0 "
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"\\u0018\0 \\u0019\0 \\u001a\0 \\u001b\0 "
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"\\u001c\0 \\u001d\0 \\u001e\0 \\u001f\0 "
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" \0 !\0 \\\"\0 #\0 "
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"$\0 %\0 &\0 '\0 "
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"(\0 )\0 *\0 +\0 "
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",\0 -\0 .\0 /\0 "
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"0\0 1\0 2\0 3\0 "
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"4\0 5\0 6\0 7\0 "
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"8\0 9\0 :\0 ;\0 "
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"<\0 =\0 >\0 ?\0 "
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"@\0 A\0 B\0 C\0 "
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"D\0 E\0 F\0 G\0 "
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"H\0 I\0 J\0 K\0 "
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"L\0 M\0 N\0 O\0 "
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"P\0 Q\0 R\0 S\0 "
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"T\0 U\0 V\0 W\0 "
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"X\0 Y\0 Z\0 [\0 "
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"\\\\\0 ]\0 ^\0 _\0 "
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"`\0 a\0 b\0 c\0 "
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"d\0 e\0 f\0 g\0 "
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"h\0 i\0 j\0 k\0 "
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"l\0 m\0 n\0 o\0 "
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"p\0 q\0 r\0 s\0 "
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"t\0 u\0 v\0 w\0 "
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"x\0 y\0 z\0 {\0 "
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"|\0 }\0 ~\0 \x7F\0 "
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"\x80\0 \x81\0 \x82\0 \x83\0 "
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"\x84\0 \x85\0 \x86\0 \x87\0 "
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"\x88\0 \x89\0 \x8A\0 \x8B\0 "
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"\x8C\0 \x8D\0 \x8E\0 \x8F\0 "
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"\x90\0 \x91\0 \x92\0 \x93\0 "
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"\x94\0 \x95\0 \x96\0 \x97\0 "
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"\x98\0 \x99\0 \x9A\0 \x9B\0 "
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"\x9C\0 \x9D\0 \x9E\0 \x9F\0 "
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"\xA0\0 \xA1\0 \xA2\0 \xA3\0 "
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"\xA4\0 \xA5\0 \xA6\0 \xA7\0 "
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"\xA8\0 \xA9\0 \xAA\0 \xAB\0 "
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"\xAC\0 \xAD\0 \xAE\0 \xAF\0 "
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"\xB0\0 \xB1\0 \xB2\0 \xB3\0 "
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"\xB4\0 \xB5\0 \xB6\0 \xB7\0 "
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"\xB8\0 \xB9\0 \xBA\0 \xBB\0 "
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"\xBC\0 \xBD\0 \xBE\0 \xBF\0 "
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"\xC0\0 \xC1\0 \xC2\0 \xC3\0 "
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"\xC4\0 \xC5\0 \xC6\0 \xC7\0 "
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"\xC8\0 \xC9\0 \xCA\0 \xCB\0 "
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"\xCC\0 \xCD\0 \xCE\0 \xCF\0 "
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"\xD0\0 \xD1\0 \xD2\0 \xD3\0 "
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"\xD4\0 \xD5\0 \xD6\0 \xD7\0 "
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"\xD8\0 \xD9\0 \xDA\0 \xDB\0 "
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"\xDC\0 \xDD\0 \xDE\0 \xDF\0 "
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"\xE0\0 \xE1\0 \xE2\0 \xE3\0 "
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"\xE4\0 \xE5\0 \xE6\0 \xE7\0 "
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"\xE8\0 \xE9\0 \xEA\0 \xEB\0 "
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"\xEC\0 \xED\0 \xEE\0 \xEF\0 "
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"\xF0\0 \xF1\0 \xF2\0 \xF3\0 "
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"\xF4\0 \xF5\0 \xF6\0 \xF7\0 "
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"\xF8\0 \xF9\0 \xFA\0 \xFB\0 "
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"\xFC\0 \xFD\0 \xFE\0 \xFF\0 ";
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JsonStringifier::JsonStringifier(Isolate* isolate)
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: isolate_(isolate), builder_(isolate), gap_(nullptr), indent_(0) {
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tojson_string_ = factory()->toJSON_string();
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stack_ = factory()->NewJSArray(8);
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}
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MaybeHandle<Object> JsonStringifier::Stringify(Handle<Object> object,
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Handle<Object> replacer,
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Handle<Object> gap) {
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if (!InitializeReplacer(replacer)) return MaybeHandle<Object>();
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if (!gap->IsUndefined(isolate_) && !InitializeGap(gap)) {
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return MaybeHandle<Object>();
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}
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Result result = SerializeObject(object);
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if (result == UNCHANGED) return factory()->undefined_value();
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if (result == SUCCESS) return builder_.Finish();
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DCHECK(result == EXCEPTION);
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return MaybeHandle<Object>();
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}
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bool JsonStringifier::InitializeReplacer(Handle<Object> replacer) {
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DCHECK(property_list_.is_null());
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DCHECK(replacer_function_.is_null());
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Maybe<bool> is_array = Object::IsArray(replacer);
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if (is_array.IsNothing()) return false;
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if (is_array.FromJust()) {
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HandleScope handle_scope(isolate_);
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Handle<OrderedHashSet> set = factory()->NewOrderedHashSet();
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Handle<Object> length_obj;
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(
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isolate_, length_obj,
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Object::GetLengthFromArrayLike(isolate_,
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Handle<JSReceiver>::cast(replacer)),
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false);
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uint32_t length;
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if (!length_obj->ToUint32(&length)) length = kMaxUInt32;
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for (uint32_t i = 0; i < length; i++) {
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Handle<Object> element;
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Handle<String> key;
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(
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isolate_, element, Object::GetElement(isolate_, replacer, i), false);
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if (element->IsNumber() || element->IsString()) {
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(
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isolate_, key, Object::ToString(isolate_, element), false);
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} else if (element->IsJSValue()) {
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Handle<Object> value(Handle<JSValue>::cast(element)->value(), isolate_);
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if (value->IsNumber() || value->IsString()) {
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(
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isolate_, key, Object::ToString(isolate_, element), false);
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}
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}
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if (key.is_null()) continue;
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// Object keys are internalized, so do it here.
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key = factory()->InternalizeString(key);
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set = OrderedHashSet::Add(isolate_, set, key);
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}
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property_list_ = OrderedHashSet::ConvertToKeysArray(
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isolate_, set, GetKeysConversion::kKeepNumbers);
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property_list_ = handle_scope.CloseAndEscape(property_list_);
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} else if (replacer->IsCallable()) {
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replacer_function_ = Handle<JSReceiver>::cast(replacer);
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}
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return true;
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}
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bool JsonStringifier::InitializeGap(Handle<Object> gap) {
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DCHECK_NULL(gap_);
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HandleScope scope(isolate_);
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if (gap->IsJSValue()) {
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Handle<Object> value(Handle<JSValue>::cast(gap)->value(), isolate_);
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if (value->IsString()) {
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate_, gap,
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Object::ToString(isolate_, gap), false);
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} else if (value->IsNumber()) {
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate_, gap,
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Object::ToNumber(isolate_, gap), false);
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}
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}
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if (gap->IsString()) {
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Handle<String> gap_string = Handle<String>::cast(gap);
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if (gap_string->length() > 0) {
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int gap_length = std::min(gap_string->length(), 10);
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gap_ = NewArray<uc16>(gap_length + 1);
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String::WriteToFlat(*gap_string, gap_, 0, gap_length);
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for (int i = 0; i < gap_length; i++) {
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if (gap_[i] > String::kMaxOneByteCharCode) {
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builder_.ChangeEncoding();
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break;
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}
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}
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gap_[gap_length] = '\0';
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}
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} else if (gap->IsNumber()) {
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int num_value = DoubleToInt32(gap->Number());
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if (num_value > 0) {
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int gap_length = std::min(num_value, 10);
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gap_ = NewArray<uc16>(gap_length + 1);
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for (int i = 0; i < gap_length; i++) gap_[i] = ' ';
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gap_[gap_length] = '\0';
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}
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}
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return true;
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}
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MaybeHandle<Object> JsonStringifier::ApplyToJsonFunction(Handle<Object> object,
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Handle<Object> key) {
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HandleScope scope(isolate_);
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Handle<Object> object_for_lookup = object;
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if (object->IsBigInt()) {
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ASSIGN_RETURN_ON_EXCEPTION(isolate_, object_for_lookup,
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Object::ToObject(isolate_, object), Object);
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}
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DCHECK(object_for_lookup->IsJSReceiver());
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// Retrieve toJSON function.
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Handle<Object> fun;
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{
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LookupIterator it(isolate_, object_for_lookup, tojson_string_,
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LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
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ASSIGN_RETURN_ON_EXCEPTION(isolate_, fun, Object::GetProperty(&it), Object);
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if (!fun->IsCallable()) return object;
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}
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// Call toJSON function.
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if (key->IsSmi()) key = factory()->NumberToString(key);
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Handle<Object> argv[] = {key};
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ASSIGN_RETURN_ON_EXCEPTION(isolate_, object,
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Execution::Call(isolate_, fun, object, 1, argv),
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Object);
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return scope.CloseAndEscape(object);
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}
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MaybeHandle<Object> JsonStringifier::ApplyReplacerFunction(
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Handle<Object> value, Handle<Object> key, Handle<Object> initial_holder) {
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HandleScope scope(isolate_);
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if (key->IsSmi()) key = factory()->NumberToString(key);
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Handle<Object> argv[] = {key, value};
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Handle<JSReceiver> holder = CurrentHolder(value, initial_holder);
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ASSIGN_RETURN_ON_EXCEPTION(
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isolate_, value,
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Execution::Call(isolate_, replacer_function_, holder, 2, argv), Object);
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return scope.CloseAndEscape(value);
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}
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Handle<JSReceiver> JsonStringifier::CurrentHolder(
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Handle<Object> value, Handle<Object> initial_holder) {
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int length = Smi::ToInt(stack_->length());
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if (length == 0) {
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Handle<JSObject> holder =
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factory()->NewJSObject(isolate_->object_function());
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JSObject::AddProperty(isolate_, holder, factory()->empty_string(),
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initial_holder, NONE);
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return holder;
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} else {
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FixedArray* elements = FixedArray::cast(stack_->elements());
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return Handle<JSReceiver>(JSReceiver::cast(elements->get(length - 1)),
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isolate_);
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}
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}
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JsonStringifier::Result JsonStringifier::StackPush(Handle<Object> object) {
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StackLimitCheck check(isolate_);
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if (check.HasOverflowed()) {
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isolate_->StackOverflow();
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return EXCEPTION;
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}
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int length = Smi::ToInt(stack_->length());
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{
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DisallowHeapAllocation no_allocation;
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FixedArray* elements = FixedArray::cast(stack_->elements());
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for (int i = 0; i < length; i++) {
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if (elements->get(i) == *object) {
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AllowHeapAllocation allow_to_return_error;
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Handle<Object> error =
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factory()->NewTypeError(MessageTemplate::kCircularStructure);
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isolate_->Throw(*error);
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return EXCEPTION;
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}
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}
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}
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JSArray::SetLength(stack_, length + 1);
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FixedArray::cast(stack_->elements())->set(length, *object);
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return SUCCESS;
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}
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void JsonStringifier::StackPop() {
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int length = Smi::ToInt(stack_->length());
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stack_->set_length(Smi::FromInt(length - 1));
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}
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template <bool deferred_string_key>
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JsonStringifier::Result JsonStringifier::Serialize_(Handle<Object> object,
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bool comma,
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Handle<Object> key) {
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StackLimitCheck interrupt_check(isolate_);
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Handle<Object> initial_value = object;
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if (interrupt_check.InterruptRequested() &&
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isolate_->stack_guard()->HandleInterrupts()->IsException(isolate_)) {
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return EXCEPTION;
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}
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if (object->IsJSReceiver() || object->IsBigInt()) {
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(
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isolate_, object, ApplyToJsonFunction(object, key), EXCEPTION);
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}
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if (!replacer_function_.is_null()) {
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(
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isolate_, object, ApplyReplacerFunction(object, key, initial_value),
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EXCEPTION);
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}
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if (object->IsSmi()) {
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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return SerializeSmi(Smi::cast(*object));
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}
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switch (HeapObject::cast(*object)->map()->instance_type()) {
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case HEAP_NUMBER_TYPE:
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case MUTABLE_HEAP_NUMBER_TYPE:
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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return SerializeHeapNumber(Handle<HeapNumber>::cast(object));
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case BIGINT_TYPE:
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isolate_->Throw(
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*factory()->NewTypeError(MessageTemplate::kBigIntSerializeJSON));
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return EXCEPTION;
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case ODDBALL_TYPE:
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switch (Oddball::cast(*object)->kind()) {
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case Oddball::kFalse:
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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builder_.AppendCString("false");
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return SUCCESS;
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case Oddball::kTrue:
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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builder_.AppendCString("true");
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return SUCCESS;
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case Oddball::kNull:
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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builder_.AppendCString("null");
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return SUCCESS;
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default:
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return UNCHANGED;
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}
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case JS_ARRAY_TYPE:
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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return SerializeJSArray(Handle<JSArray>::cast(object));
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case JS_VALUE_TYPE:
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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return SerializeJSValue(Handle<JSValue>::cast(object));
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case SYMBOL_TYPE:
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return UNCHANGED;
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default:
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if (object->IsString()) {
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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SerializeString(Handle<String>::cast(object));
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return SUCCESS;
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} else {
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DCHECK(object->IsJSReceiver());
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if (object->IsCallable()) return UNCHANGED;
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// Go to slow path for global proxy and objects requiring access checks.
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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if (object->IsJSProxy()) {
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return SerializeJSProxy(Handle<JSProxy>::cast(object));
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}
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return SerializeJSObject(Handle<JSObject>::cast(object));
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}
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}
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UNREACHABLE();
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}
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JsonStringifier::Result JsonStringifier::SerializeJSValue(
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Handle<JSValue> object) {
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Object* raw = object->value();
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if (raw->IsString()) {
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Handle<Object> value;
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(
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isolate_, value, Object::ToString(isolate_, object), EXCEPTION);
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SerializeString(Handle<String>::cast(value));
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} else if (raw->IsNumber()) {
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Handle<Object> value;
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(
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isolate_, value, Object::ToNumber(isolate_, object), EXCEPTION);
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if (value->IsSmi()) return SerializeSmi(Smi::cast(*value));
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SerializeHeapNumber(Handle<HeapNumber>::cast(value));
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} else if (raw->IsBigInt()) {
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isolate_->Throw(
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*factory()->NewTypeError(MessageTemplate::kBigIntSerializeJSON));
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return EXCEPTION;
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} else if (raw->IsBoolean()) {
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builder_.AppendCString(raw->IsTrue(isolate_) ? "true" : "false");
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} else {
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// ES6 24.3.2.1 step 10.c, serialize as an ordinary JSObject.
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return SerializeJSObject(object);
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}
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return SUCCESS;
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}
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JsonStringifier::Result JsonStringifier::SerializeSmi(Smi* object) {
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static const int kBufferSize = 100;
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char chars[kBufferSize];
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Vector<char> buffer(chars, kBufferSize);
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builder_.AppendCString(IntToCString(object->value(), buffer));
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return SUCCESS;
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}
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JsonStringifier::Result JsonStringifier::SerializeDouble(double number) {
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if (std::isinf(number) || std::isnan(number)) {
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builder_.AppendCString("null");
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return SUCCESS;
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}
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static const int kBufferSize = 100;
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char chars[kBufferSize];
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Vector<char> buffer(chars, kBufferSize);
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builder_.AppendCString(DoubleToCString(number, buffer));
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return SUCCESS;
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}
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JsonStringifier::Result JsonStringifier::SerializeJSArray(
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Handle<JSArray> object) {
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HandleScope handle_scope(isolate_);
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Result stack_push = StackPush(object);
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if (stack_push != SUCCESS) return stack_push;
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uint32_t length = 0;
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CHECK(object->length()->ToArrayLength(&length));
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DCHECK(!object->IsAccessCheckNeeded());
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builder_.AppendCharacter('[');
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Indent();
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uint32_t i = 0;
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if (replacer_function_.is_null()) {
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switch (object->GetElementsKind()) {
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case PACKED_SMI_ELEMENTS: {
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Handle<FixedArray> elements(FixedArray::cast(object->elements()),
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isolate_);
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StackLimitCheck interrupt_check(isolate_);
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while (i < length) {
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if (interrupt_check.InterruptRequested() &&
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isolate_->stack_guard()->HandleInterrupts()->IsException(
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isolate_)) {
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return EXCEPTION;
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}
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Separator(i == 0);
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SerializeSmi(Smi::cast(elements->get(i)));
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i++;
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}
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break;
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}
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case PACKED_DOUBLE_ELEMENTS: {
|
// Empty array is FixedArray but not FixedDoubleArray.
|
if (length == 0) break;
|
Handle<FixedDoubleArray> elements(
|
FixedDoubleArray::cast(object->elements()), isolate_);
|
StackLimitCheck interrupt_check(isolate_);
|
while (i < length) {
|
if (interrupt_check.InterruptRequested() &&
|
isolate_->stack_guard()->HandleInterrupts()->IsException(
|
isolate_)) {
|
return EXCEPTION;
|
}
|
Separator(i == 0);
|
SerializeDouble(elements->get_scalar(i));
|
i++;
|
}
|
break;
|
}
|
case PACKED_ELEMENTS: {
|
Handle<Object> old_length(object->length(), isolate_);
|
while (i < length) {
|
if (object->length() != *old_length ||
|
object->GetElementsKind() != PACKED_ELEMENTS) {
|
// Fall back to slow path.
|
break;
|
}
|
Separator(i == 0);
|
Result result = SerializeElement(
|
isolate_,
|
Handle<Object>(FixedArray::cast(object->elements())->get(i),
|
isolate_),
|
i);
|
if (result == UNCHANGED) {
|
builder_.AppendCString("null");
|
} else if (result != SUCCESS) {
|
return result;
|
}
|
i++;
|
}
|
break;
|
}
|
// The FAST_HOLEY_* cases could be handled in a faster way. They resemble
|
// the non-holey cases except that a lookup is necessary for holes.
|
default:
|
break;
|
}
|
}
|
if (i < length) {
|
// Slow path for non-fast elements and fall-back in edge case.
|
Result result = SerializeArrayLikeSlow(object, i, length);
|
if (result != SUCCESS) return result;
|
}
|
Unindent();
|
if (length > 0) NewLine();
|
builder_.AppendCharacter(']');
|
StackPop();
|
return SUCCESS;
|
}
|
|
JsonStringifier::Result JsonStringifier::SerializeArrayLikeSlow(
|
Handle<JSReceiver> object, uint32_t start, uint32_t length) {
|
// We need to write out at least two characters per array element.
|
static const int kMaxSerializableArrayLength = String::kMaxLength / 2;
|
if (length > kMaxSerializableArrayLength) {
|
isolate_->Throw(*isolate_->factory()->NewInvalidStringLengthError());
|
return EXCEPTION;
|
}
|
for (uint32_t i = start; i < length; i++) {
|
Separator(i == 0);
|
Handle<Object> element;
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
isolate_, element, JSReceiver::GetElement(isolate_, object, i),
|
EXCEPTION);
|
Result result = SerializeElement(isolate_, element, i);
|
if (result == SUCCESS) continue;
|
if (result == UNCHANGED) {
|
// Detect overflow sooner for large sparse arrays.
|
if (builder_.HasOverflowed()) return EXCEPTION;
|
builder_.AppendCString("null");
|
} else {
|
return result;
|
}
|
}
|
return SUCCESS;
|
}
|
|
JsonStringifier::Result JsonStringifier::SerializeJSObject(
|
Handle<JSObject> object) {
|
HandleScope handle_scope(isolate_);
|
Result stack_push = StackPush(object);
|
if (stack_push != SUCCESS) return stack_push;
|
|
if (property_list_.is_null() &&
|
!object->map()->IsCustomElementsReceiverMap() &&
|
object->HasFastProperties() &&
|
Handle<JSObject>::cast(object)->elements()->length() == 0) {
|
DCHECK(object->IsJSObject());
|
DCHECK(!object->IsJSGlobalProxy());
|
Handle<JSObject> js_obj = Handle<JSObject>::cast(object);
|
DCHECK(!js_obj->HasIndexedInterceptor());
|
DCHECK(!js_obj->HasNamedInterceptor());
|
Handle<Map> map(js_obj->map(), isolate_);
|
builder_.AppendCharacter('{');
|
Indent();
|
bool comma = false;
|
for (int i = 0; i < map->NumberOfOwnDescriptors(); i++) {
|
Handle<Name> name(map->instance_descriptors()->GetKey(i), isolate_);
|
// TODO(rossberg): Should this throw?
|
if (!name->IsString()) continue;
|
Handle<String> key = Handle<String>::cast(name);
|
PropertyDetails details = map->instance_descriptors()->GetDetails(i);
|
if (details.IsDontEnum()) continue;
|
Handle<Object> property;
|
if (details.location() == kField && *map == js_obj->map()) {
|
DCHECK_EQ(kData, details.kind());
|
FieldIndex field_index = FieldIndex::ForDescriptor(*map, i);
|
property = JSObject::FastPropertyAt(js_obj, details.representation(),
|
field_index);
|
} else {
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
isolate_, property,
|
Object::GetPropertyOrElement(isolate_, js_obj, key), EXCEPTION);
|
}
|
Result result = SerializeProperty(property, comma, key);
|
if (!comma && result == SUCCESS) comma = true;
|
if (result == EXCEPTION) return result;
|
}
|
Unindent();
|
if (comma) NewLine();
|
builder_.AppendCharacter('}');
|
} else {
|
Result result = SerializeJSReceiverSlow(object);
|
if (result != SUCCESS) return result;
|
}
|
StackPop();
|
return SUCCESS;
|
}
|
|
JsonStringifier::Result JsonStringifier::SerializeJSReceiverSlow(
|
Handle<JSReceiver> object) {
|
Handle<FixedArray> contents = property_list_;
|
if (contents.is_null()) {
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
isolate_, contents,
|
KeyAccumulator::GetKeys(object, KeyCollectionMode::kOwnOnly,
|
ENUMERABLE_STRINGS,
|
GetKeysConversion::kConvertToString),
|
EXCEPTION);
|
}
|
builder_.AppendCharacter('{');
|
Indent();
|
bool comma = false;
|
for (int i = 0; i < contents->length(); i++) {
|
Handle<String> key(String::cast(contents->get(i)), isolate_);
|
Handle<Object> property;
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
isolate_, property, Object::GetPropertyOrElement(isolate_, object, key),
|
EXCEPTION);
|
Result result = SerializeProperty(property, comma, key);
|
if (!comma && result == SUCCESS) comma = true;
|
if (result == EXCEPTION) return result;
|
}
|
Unindent();
|
if (comma) NewLine();
|
builder_.AppendCharacter('}');
|
return SUCCESS;
|
}
|
|
JsonStringifier::Result JsonStringifier::SerializeJSProxy(
|
Handle<JSProxy> object) {
|
HandleScope scope(isolate_);
|
Result stack_push = StackPush(object);
|
if (stack_push != SUCCESS) return stack_push;
|
Maybe<bool> is_array = Object::IsArray(object);
|
if (is_array.IsNothing()) return EXCEPTION;
|
if (is_array.FromJust()) {
|
Handle<Object> length_object;
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
isolate_, length_object,
|
Object::GetLengthFromArrayLike(isolate_,
|
Handle<JSReceiver>::cast(object)),
|
EXCEPTION);
|
uint32_t length;
|
if (!length_object->ToUint32(&length)) {
|
// Technically, we need to be able to handle lengths outside the
|
// uint32_t range. However, we would run into string size overflow
|
// if we tried to stringify such an array.
|
isolate_->Throw(*isolate_->factory()->NewInvalidStringLengthError());
|
return EXCEPTION;
|
}
|
builder_.AppendCharacter('[');
|
Indent();
|
Result result = SerializeArrayLikeSlow(object, 0, length);
|
if (result != SUCCESS) return result;
|
Unindent();
|
if (length > 0) NewLine();
|
builder_.AppendCharacter(']');
|
} else {
|
Result result = SerializeJSReceiverSlow(object);
|
if (result != SUCCESS) return result;
|
}
|
StackPop();
|
return SUCCESS;
|
}
|
|
template <typename SrcChar, typename DestChar>
|
void JsonStringifier::SerializeStringUnchecked_(
|
Vector<const SrcChar> src,
|
IncrementalStringBuilder::NoExtend<DestChar>* dest) {
|
// Assert that uc16 character is not truncated down to 8 bit.
|
// The <uc16, char> version of this method must not be called.
|
DCHECK(sizeof(DestChar) >= sizeof(SrcChar));
|
|
for (int i = 0; i < src.length(); i++) {
|
SrcChar c = src[i];
|
if (DoNotEscape(c)) {
|
dest->Append(c);
|
} else {
|
dest->AppendCString(&JsonEscapeTable[c * kJsonEscapeTableEntrySize]);
|
}
|
}
|
}
|
|
template <typename SrcChar, typename DestChar>
|
void JsonStringifier::SerializeString_(Handle<String> string) {
|
int length = string->length();
|
builder_.Append<uint8_t, DestChar>('"');
|
// We might be able to fit the whole escaped string in the current string
|
// part, or we might need to allocate.
|
if (int worst_case_length = builder_.EscapedLengthIfCurrentPartFits(length)) {
|
DisallowHeapAllocation no_gc;
|
Vector<const SrcChar> vector = string->GetCharVector<SrcChar>();
|
IncrementalStringBuilder::NoExtendBuilder<DestChar> no_extend(
|
&builder_, worst_case_length);
|
SerializeStringUnchecked_(vector, &no_extend);
|
} else {
|
FlatStringReader reader(isolate_, string);
|
for (int i = 0; i < reader.length(); i++) {
|
SrcChar c = reader.Get<SrcChar>(i);
|
if (DoNotEscape(c)) {
|
builder_.Append<SrcChar, DestChar>(c);
|
} else {
|
builder_.AppendCString(&JsonEscapeTable[c * kJsonEscapeTableEntrySize]);
|
}
|
}
|
}
|
builder_.Append<uint8_t, DestChar>('"');
|
}
|
|
template <>
|
bool JsonStringifier::DoNotEscape(uint8_t c) {
|
return c >= '#' && c <= '~' && c != '\\';
|
}
|
|
template <>
|
bool JsonStringifier::DoNotEscape(uint16_t c) {
|
return c >= '#' && c != '\\' && c != 0x7F;
|
}
|
|
void JsonStringifier::NewLine() {
|
if (gap_ == nullptr) return;
|
builder_.AppendCharacter('\n');
|
for (int i = 0; i < indent_; i++) builder_.AppendCString(gap_);
|
}
|
|
void JsonStringifier::Separator(bool first) {
|
if (!first) builder_.AppendCharacter(',');
|
NewLine();
|
}
|
|
void JsonStringifier::SerializeDeferredKey(bool deferred_comma,
|
Handle<Object> deferred_key) {
|
Separator(!deferred_comma);
|
SerializeString(Handle<String>::cast(deferred_key));
|
builder_.AppendCharacter(':');
|
if (gap_ != nullptr) builder_.AppendCharacter(' ');
|
}
|
|
void JsonStringifier::SerializeString(Handle<String> object) {
|
object = String::Flatten(isolate_, object);
|
if (builder_.CurrentEncoding() == String::ONE_BYTE_ENCODING) {
|
if (object->IsOneByteRepresentationUnderneath()) {
|
SerializeString_<uint8_t, uint8_t>(object);
|
} else {
|
builder_.ChangeEncoding();
|
SerializeString(object);
|
}
|
} else {
|
if (object->IsOneByteRepresentationUnderneath()) {
|
SerializeString_<uint8_t, uc16>(object);
|
} else {
|
SerializeString_<uc16, uc16>(object);
|
}
|
}
|
}
|
|
} // namespace internal
|
} // namespace v8
|
