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Add StringBuilder formatters

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mniip committed May 2, 2018
1 parent f864f81 commit eeacc90fc57734aa542e082c7bcc755df0e52caf
Showing with 92 additions and 3 deletions.
  1. +90 −0 src/common/Format.h
  2. +2 −3 src/common/String.h
@@ -0,0 +1,90 @@
#pragma once
#include <functional>
#include <ios>
#include "common/String.h"
template<typename T> class FormatProxy
{
T const &value;
inline FormatProxy(T const &_value): value(_value) {}
public:
inline void Write(StringBuilder &b) { b << value; }
};
class Format
{
std::function<void(StringBuilder &)> writer;
public:
template<typename T, typename... Ts> inline Format(T const &value, Ts... args):
writer([value, args...](StringBuilder &b) { FormatProxy<T>(value, args...).Write(b); })
{}
friend StringBuilder &operator<<(StringBuilder &, Format const &);
enum Base { Dec, Oct, Hex };
enum Float { Default, Fixed, Scientific };
};
inline StringBuilder &operator<<(StringBuilder &b, Format const &f)
{
f.writer(b);
return b;
}
template<typename T> class IntegralFormatProxy
{
T value;
Format::Base base;
size_t width;
public:
inline IntegralFormatProxy(T _value, Format::Base _base = Format::Dec, size_t _width = 0): value(_value), base(_base), width(_width) {}
inline void Write(StringBuilder &b)
{
std::ios_base::fmtflags oldflags = b.flags;
b.flags &= ~std::ios_base::basefield;
b.flags |= base == Format::Hex ? std::ios_base::hex : base == Format::Oct ? std::ios_base::oct : std::ios_base::dec;
size_t oldwidth = b.width;
b.width = width;
b << value;
b.flags = oldflags;
b.width = oldwidth;
}
};
template<> class FormatProxy<short int>: public IntegralFormatProxy<short int> { using IntegralFormatProxy::IntegralFormatProxy; };
template<> class FormatProxy<int>: public IntegralFormatProxy<int> { using IntegralFormatProxy::IntegralFormatProxy; };
template<> class FormatProxy<long int>: public IntegralFormatProxy<long int> { using IntegralFormatProxy::IntegralFormatProxy; };
template<> class FormatProxy<long long int>: public IntegralFormatProxy<long long int> { using IntegralFormatProxy::IntegralFormatProxy; };
template<> class FormatProxy<unsigned short int>: public IntegralFormatProxy<unsigned short int> { using IntegralFormatProxy::IntegralFormatProxy; };
template<> class FormatProxy<unsigned int>: public IntegralFormatProxy<unsigned int> { using IntegralFormatProxy::IntegralFormatProxy; };
template<> class FormatProxy<unsigned long int>: public IntegralFormatProxy<unsigned long int> { using IntegralFormatProxy::IntegralFormatProxy; };
template<> class FormatProxy<unsigned long long int>: public IntegralFormatProxy<unsigned long long int> { using IntegralFormatProxy::IntegralFormatProxy; };
template<typename T> class FloatingFormatProxy
{
T value;
size_t precision;
Format::Float style;
size_t width;
public:
inline FloatingFormatProxy(T _value, size_t _precision, Format::Float _style = Format::Default, size_t _width = 0): value(_value), precision(_precision), style(_style), width(_width) {}
inline void Write(StringBuilder &b)
{
std::ios_base::fmtflags oldflags = b.flags;
b.flags &= ~std::ios_base::floatfield;
b.flags |= style == Format::Fixed ? std::ios_base::fixed : style == Format::Scientific ? std::ios_base::scientific : std::ios_base::fmtflags();
size_t oldwidth = b.width;
b.width = width;
size_t oldprecision = b.precision;
b.precision = precision;
b << value;
b.flags = oldflags;
b.width = oldwidth;
b.precision = oldprecision;
}
};
template<> class FormatProxy<float>: public FloatingFormatProxy<float> { using FloatingFormatProxy::FloatingFormatProxy; };
template<> class FormatProxy<double>: public FloatingFormatProxy<double> { using FloatingFormatProxy::FloatingFormatProxy; };
@@ -1,5 +1,4 @@
#ifndef TPT_STRING
#define TPT_STRING
#pragma once
#include <stdexcept>
#include <sstream>
@@ -285,4 +284,4 @@ StringBuilder &operator<<(StringBuilder &, float);
StringBuilder &operator<<(StringBuilder &, double);
template<size_t N> StringBuilder &operator<<(StringBuilder &b, ByteString::value_type const (&data)[N]) { return b << ByteString(data).FromUtf8(); }
#endif
#include "common/Format.h"

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