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0710b24f2d
This patch improves JSON.stringify performance through three changes: 1. Use a single StringBuilder for the entire operation instead of building up intermediate strings and concatenating them. 2. Format numbers directly into the StringBuilder via a new public number_to_string(StringBuilder&, ...) overload, avoiding temporary String allocations. 3. Track indentation as a depth counter instead of repeatedly concatenating the gap string.
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
/*
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* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibJS/Export.h>
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#include <LibJS/Runtime/Object.h>
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namespace JS {
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class JS_API JSONObject final : public Object {
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JS_OBJECT(JSONObject, Object);
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GC_DECLARE_ALLOCATOR(JSONObject);
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public:
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virtual void initialize(Realm&) override;
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virtual ~JSONObject() override = default;
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// The base implementation of stringify is exposed because it is used by
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// test-js to communicate between the JS tests and the C++ test runner.
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static ThrowCompletionOr<Optional<String>> stringify_impl(VM&, Value value, Value replacer, Value space);
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static ThrowCompletionOr<Value> parse_json(VM&, StringView text);
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private:
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explicit JSONObject(Realm&);
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struct StringifyState {
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GC::Ptr<FunctionObject> replacer_function;
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HashTable<GC::Ptr<Object>> seen_objects;
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size_t indent_depth { 0 };
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String gap;
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Optional<Vector<Utf16String>> property_list;
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StringBuilder builder;
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};
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// Stringify helpers
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static ThrowCompletionOr<bool> serialize_json_property(VM&, StringifyState&, PropertyKey const& key, Object* holder);
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static ThrowCompletionOr<void> serialize_json_object(VM&, StringifyState&, Object&);
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static ThrowCompletionOr<void> serialize_json_array(VM&, StringifyState&, Object&);
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static void quote_json_string(StringBuilder&, Utf16View const&);
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// Parse helpers
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static ThrowCompletionOr<Value> internalize_json_property(VM&, Object* holder, PropertyKey const& name, FunctionObject& reviver);
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JS_DECLARE_NATIVE_FUNCTION(stringify);
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JS_DECLARE_NATIVE_FUNCTION(parse);
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JS_DECLARE_NATIVE_FUNCTION(raw_json);
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JS_DECLARE_NATIVE_FUNCTION(is_raw_json);
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};
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}
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