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// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
// SPDX-License-Identifier: BSL-1.0
#ifndef CATCH_JSONWRITER_HPP_INCLUDED
#define CATCH_JSONWRITER_HPP_INCLUDED
#include <catch2/internal/catch_reusable_string_stream.hpp>
#include <catch2/internal/catch_stringref.hpp>
#include <cstdint>
#include <sstream>
namespace Catch {
class JsonObjectWriter;
class JsonArrayWriter;
struct JsonUtils {
static void indent( std::ostream& os, std::uint64_t level );
static void appendCommaNewline( std::ostream& os,
bool& should_comma,
std::uint64_t level );
};
class JsonValueWriter {
public:
JsonValueWriter( std::ostream& os );
JsonValueWriter( std::ostream& os, std::uint64_t indent_level );
JsonObjectWriter writeObject() &&;
JsonArrayWriter writeArray() &&;
template <typename T>
void write( T const& value ) && {
writeImpl( value, !std::is_arithmetic<T>::value );
}
void write( StringRef value ) &&;
void write( bool value ) &&;
private:
void writeImpl( StringRef value, bool quote );
// Without this SFINAE, this overload is a better match
// for `std::string`, `char const*`, `char const[N]` args.
// While it would still work, it would cause code bloat
// and multiple iteration over the strings
template <typename T,
typename = typename std::enable_if_t<
!std::is_convertible<T, StringRef>::value>>
void writeImpl( T const& value, bool quote_value ) {
m_sstream << value;
writeImpl( m_sstream.str(), quote_value );
}
std::ostream& m_os;
std::stringstream m_sstream;
std::uint64_t m_indent_level;
};
class JsonObjectWriter {
public:
JsonObjectWriter( std::ostream& os );
JsonObjectWriter( std::ostream& os, std::uint64_t indent_level );
JsonObjectWriter( JsonObjectWriter&& source ) noexcept;
JsonObjectWriter& operator=( JsonObjectWriter&& source ) = delete;
~JsonObjectWriter();
JsonValueWriter write( StringRef key );
private:
std::ostream& m_os;
std::uint64_t m_indent_level;
bool m_should_comma = false;
bool m_active = true;
};
class JsonArrayWriter {
public:
JsonArrayWriter( std::ostream& os );
JsonArrayWriter( std::ostream& os, std::uint64_t indent_level );
JsonArrayWriter( JsonArrayWriter&& source ) noexcept;
JsonArrayWriter& operator=( JsonArrayWriter&& source ) = delete;
~JsonArrayWriter();
JsonObjectWriter writeObject();
JsonArrayWriter writeArray();
template <typename T>
JsonArrayWriter& write( T const& value ) {
return writeImpl( value );
}
JsonArrayWriter& write( bool value );
private:
template <typename T>
JsonArrayWriter& writeImpl( T const& value ) {
JsonUtils::appendCommaNewline(
m_os, m_should_comma, m_indent_level + 1 );
JsonValueWriter{ m_os }.write( value );
return *this;
}
std::ostream& m_os;
std::uint64_t m_indent_level;
bool m_should_comma = false;
bool m_active = true;
};
} // namespace Catch
#endif // CATCH_JSONWRITER_HPP_INCLUDED
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