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json
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add detail/parsing/output_adapters.hpp

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Théo DELRIEU 2017-08-14 17:41:23 +02:00
parent ae6f66048c
commit 4dbb433a79
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GPG Key ID: 51AC4B3A2C47C10F
3 changed files with 117 additions and 102 deletions
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3
Makefile
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@ -17,7 +17,8 @@ SRCS = ${SRCDIR}/json.hpp \
${SRCDIR}/detail/iterators/internal_iterator.hpp \
${SRCDIR}/detail/iterators/iter_impl.hpp \
${SRCDIR}/detail/iterators/iteration_proxy.hpp \
${SRCDIR}/detail/iterators/json_reverse_iterator.hpp
${SRCDIR}/detail/iterators/json_reverse_iterator.hpp \
${SRCDIR}/detail/parsing/output_adapters.hpp

114
src/detail/parsing/output_adapters.hpp 100644
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@ -0,0 +1,114 @@
#ifndef NLOHMANN_JSON_DETAIL_PARSING_OUTPUT_ADAPTERS_HPP
#define NLOHMANN_JSON_DETAIL_PARSING_OUTPUT_ADAPTERS_HPP
#include <algorithm>
#include <cstddef>
#include <iosfwd>
#include <iterator>
#include <memory>
#include <vector>
namespace nlohmann
{
namespace detail
{
/// abstract output adapter interface
template<typename CharType> struct output_adapter_protocol
{
virtual void write_character(CharType c) = 0;
virtual void write_characters(const CharType* s, std::size_t length) = 0;
virtual ~output_adapter_protocol() = default;
};
/// a type to simplify interfaces
template<typename CharType>
using output_adapter_t = std::shared_ptr<output_adapter_protocol<CharType>>;
/// output adapter for byte vectors
template<typename CharType>
class output_vector_adapter : public output_adapter_protocol<CharType>
{
public:
explicit output_vector_adapter(std::vector<CharType>& vec) : v(vec) {}
void write_character(CharType c) override
{
v.push_back(c);
}
void write_characters(const CharType* s, std::size_t length) override
{
std::copy(s, s + length, std::back_inserter(v));
}
private:
std::vector<CharType>& v;
};
/// output adapter for output streams
template<typename CharType>
class output_stream_adapter : public output_adapter_protocol<CharType>
{
public:
explicit output_stream_adapter(std::basic_ostream<CharType>& s) : stream(s) {}
void write_character(CharType c) override
{
stream.put(c);
}
void write_characters(const CharType* s, std::size_t length) override
{
stream.write(s, static_cast<std::streamsize>(length));
}
private:
std::basic_ostream<CharType>& stream;
};
/// output adapter for basic_string
template<typename CharType>
class output_string_adapter : public output_adapter_protocol<CharType>
{
public:
explicit output_string_adapter(std::basic_string<CharType>& s) : str(s) {}
void write_character(CharType c) override
{
str.push_back(c);
}
void write_characters(const CharType* s, std::size_t length) override
{
str.append(s, length);
}
private:
std::basic_string<CharType>& str;
};
template<typename CharType>
class output_adapter
{
public:
output_adapter(std::vector<CharType>& vec)
: oa(std::make_shared<output_vector_adapter<CharType>>(vec)) {}
output_adapter(std::basic_ostream<CharType>& s)
: oa(std::make_shared<output_stream_adapter<CharType>>(s)) {}
output_adapter(std::basic_string<CharType>& s)
: oa(std::make_shared<output_string_adapter<CharType>>(s)) {}
operator output_adapter_t<CharType>()
{
return oa;
}
private:
output_adapter_t<CharType> oa = nullptr;
};
}
}
#endif

102
src/json.hpp
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@ -65,6 +65,7 @@ SOFTWARE.
#include "detail/iterators/iter_impl.hpp"
#include "detail/iterators/iteration_proxy.hpp"
#include "detail/iterators/json_reverse_iterator.hpp"
#include "detail/parsing/output_adapters.hpp"
/*!
@brief namespace for Niels Lohmann
@ -75,107 +76,6 @@ namespace nlohmann
{
namespace detail
{
/////////////////////
// output adapters //
/////////////////////
/// abstract output adapter interface
template<typename CharType> struct output_adapter_protocol
{
virtual void write_character(CharType c) = 0;
virtual void write_characters(const CharType* s, std::size_t length) = 0;
virtual ~output_adapter_protocol() = default;
};
/// a type to simplify interfaces
template<typename CharType>
using output_adapter_t = std::shared_ptr<output_adapter_protocol<CharType>>;
/// output adapter for byte vectors
template<typename CharType>
class output_vector_adapter : public output_adapter_protocol<CharType>
{
public:
explicit output_vector_adapter(std::vector<CharType>& vec) : v(vec) {}
void write_character(CharType c) override
{
v.push_back(c);
}
void write_characters(const CharType* s, std::size_t length) override
{
std::copy(s, s + length, std::back_inserter(v));
}
private:
std::vector<CharType>& v;
};
/// output adapter for output streams
template<typename CharType>
class output_stream_adapter : public output_adapter_protocol<CharType>
{
public:
explicit output_stream_adapter(std::basic_ostream<CharType>& s) : stream(s) {}
void write_character(CharType c) override
{
stream.put(c);
}
void write_characters(const CharType* s, std::size_t length) override
{
stream.write(s, static_cast<std::streamsize>(length));
}
private:
std::basic_ostream<CharType>& stream;
};
/// output adapter for basic_string
template<typename CharType>
class output_string_adapter : public output_adapter_protocol<CharType>
{
public:
explicit output_string_adapter(std::basic_string<CharType>& s) : str(s) {}
void write_character(CharType c) override
{
str.push_back(c);
}
void write_characters(const CharType* s, std::size_t length) override
{
str.append(s, length);
}
private:
std::basic_string<CharType>& str;
};
template<typename CharType>
class output_adapter
{
public:
output_adapter(std::vector<CharType>& vec)
: oa(std::make_shared<output_vector_adapter<CharType>>(vec)) {}
output_adapter(std::basic_ostream<CharType>& s)
: oa(std::make_shared<output_stream_adapter<CharType>>(s)) {}
output_adapter(std::basic_string<CharType>& s)
: oa(std::make_shared<output_string_adapter<CharType>>(s)) {}
operator output_adapter_t<CharType>()
{
return oa;
}
private:
output_adapter_t<CharType> oa = nullptr;
};
//////////////////////////////
// binary reader and writer //
//////////////////////////////