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142 lines (128 loc) · 4.08 KB
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// -*- c++ -*-
/*
* Copyright (c) 2010-2012, Jim Bosch
* All rights reserved.
*
* ndarray is distributed under a simple BSD-like license;
* see the LICENSE file that should be present in the root
* of the source distribution, or alternately available at:
* https://github.com/ndarray/ndarray
*/
#ifndef NDARRAY_formatting_h_INCLUDED
#define NDARRAY_formatting_h_INCLUDED
/**
* @file ndarray/formatting.h
*
* @brief iostream output support for Expression.
*/
#include "ndarray/ExpressionBase.h"
#include <iostream>
namespace ndarray {
namespace detail {
template <typename Derived, int N = Derived::ND::value> class Formatter;
} // namespace detail
/**
* @class FormatOptions
* @ingroup MainGroup
* @brief Options for controlling stream output of ExpressionBase.
*/
class FormatOptions {
int _width;
int _precision;
std::ios_base::fmtflags _flags;
std::string _delimiter;
std::string _open;
std::string _close;
public:
/// @brief Standard constructor.
explicit FormatOptions(
int width = 8,
int precision = 6,
std::ios_base::fmtflags flags = std::ios_base::fmtflags(0),
std::string const & delimiter = ", ",
std::string const & open = "[",
std::string const & close = "]"
) :
_width(width),
_precision(precision),
_flags(flags),
_delimiter(delimiter),
_open(open),
_close(close)
{}
/// @brief Format the given expression into the given output stream.
template <typename Derived>
void apply(std::ostream & os, ExpressionBase<Derived> const & expr) {
detail::Formatter<Derived>::apply(*this,os,expr,0);
}
template <typename Derived, int N> friend class detail::Formatter;
};
/// @brief Stream output for ExpressionBase using default-constructed FormatOptions.
template <typename Derived>
std::ostream & operator<<(std::ostream & os, ExpressionBase<Derived> const & expr) {
FormatOptions options;
options.apply(os,expr);
return os;
}
namespace detail {
/**
* @internal @ingroup ndarrayInternalGroup
* @brief Recursive metafunction used in stream output.
*/
template <typename Derived, int N>
class Formatter {
public:
static void apply(
FormatOptions const & options,
std::ostream & os,
ExpressionBase<Derived> const & expr,
int level
) {
os << options._open;
if (!expr.empty()) {
typename ExpressionBase<Derived>::Iterator const end = expr.end();
typename ExpressionBase<Derived>::Iterator iter = expr.begin();
Formatter<typename ExpressionBase<Derived>::Reference>::apply(options,os,*iter,level+1);
for (++iter; iter != end; ++iter) {
os << options._delimiter;
os << std::endl << std::string(level,' ');
Formatter<typename ExpressionBase<Derived>::Reference>::apply(options,os,*iter,level+1);
}
}
os << options._close;
}
};
/**
* @internal @ingroup ndarrayInternalGroup
* @brief Recursive metafunction used in stream output (1d specialization).
*/
template <typename Derived>
class Formatter<Derived,1> {
public:
static void apply(
FormatOptions const & options,
std::ostream & os,
ExpressionBase<Derived> const & expr,
int level
) {
os << options._open;
if (!expr.empty()) {
typename ExpressionBase<Derived>::Iterator const end = expr.end();
typename ExpressionBase<Derived>::Iterator iter = expr.begin();
int precision = os.precision(options._precision);
int width = os.width(options._width);
std::ios_base::fmtflags flags = os.setf(options._flags,std::ios_base::floatfield);
os << (*iter);
for (++iter; iter != end; ++iter) {
os << options._delimiter << (*iter);
}
os.precision(precision);
os.width(width);
os.setf(flags);
}
os << options._close;
}
};
} // namespace detail
} // namespace ndarray
#endif // !NDARRAY_formatting_h_INCLUDED