ladybird/AK/JsonArraySerializer.h
Andreas Kling cc98ea1956 Json: Add serializer fast-path for string values
Passing these through the generic JsonValue path was causing us to
instantiate temporary JsonValues that incurred a heap allocation.
This avoids that by adding specialized overloads for string types.
2019-09-04 14:40:11 +02:00

89 lines
1.7 KiB
C++

#pragma once
#include <AK/JsonValue.h>
namespace AK {
template<typename Builder>
class JsonObjectSerializer;
template<typename Builder>
class JsonArraySerializer {
public:
explicit JsonArraySerializer(Builder& builder)
: m_builder(builder)
{
m_builder.append('[');
}
JsonArraySerializer(const JsonArraySerializer&) = delete;
JsonArraySerializer(JsonArraySerializer&&) = delete;
~JsonArraySerializer()
{
if (!m_finished)
finish();
}
void add(const JsonValue& value)
{
begin_item();
value.serialize(m_builder);
}
void add(const StringView& value)
{
begin_item();
m_builder.append('"');
m_builder.append(value);
m_builder.append('"');
}
void add(const String& value)
{
begin_item();
m_builder.append('"');
m_builder.append(value);
m_builder.append('"');
}
void add(const char* value)
{
begin_item();
m_builder.append('"');
m_builder.append(value);
m_builder.append('"');
}
JsonArraySerializer<Builder> add_array()
{
begin_item();
return JsonArraySerializer(m_builder);
}
// Implemented in JsonObjectSerializer.h
JsonObjectSerializer<Builder> add_object();
void finish()
{
ASSERT(!m_finished);
m_finished = true;
m_builder.append(']');
}
private:
void begin_item()
{
if (!m_empty)
m_builder.append(',');
m_empty = false;
}
Builder& m_builder;
bool m_empty { true };
bool m_finished { false };
};
}
using AK::JsonArraySerializer;