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-// This file is part of Eigen, a lightweight C++ template library
-// for linear algebra.
-//
-// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
-// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
-//
-// This Source Code Form is subject to the terms of the Mozilla
-// Public License v. 2.0. If a copy of the MPL was not distributed
-// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-#ifndef EIGEN_IO_H
-#define EIGEN_IO_H
-
-namespace Eigen {
-
-enum { DontAlignCols = 1 };
-enum { StreamPrecision = -1,
- FullPrecision = -2 };
-
-namespace internal {
-template<typename Derived>
-std::ostream & print_matrix(std::ostream & s, const Derived& _m, const IOFormat& fmt);
-}
-
-/** \class IOFormat
- * \ingroup Core_Module
- *
- * \brief Stores a set of parameters controlling the way matrices are printed
- *
- * List of available parameters:
- * - \b precision number of digits for floating point values, or one of the special constants \c StreamPrecision and \c FullPrecision.
- * The default is the special value \c StreamPrecision which means to use the
- * stream's own precision setting, as set for instance using \c cout.precision(3). The other special value
- * \c FullPrecision means that the number of digits will be computed to match the full precision of each floating-point
- * type.
- * - \b flags an OR-ed combination of flags, the default value is 0, the only currently available flag is \c DontAlignCols which
- * allows to disable the alignment of columns, resulting in faster code.
- * - \b coeffSeparator string printed between two coefficients of the same row
- * - \b rowSeparator string printed between two rows
- * - \b rowPrefix string printed at the beginning of each row
- * - \b rowSuffix string printed at the end of each row
- * - \b matPrefix string printed at the beginning of the matrix
- * - \b matSuffix string printed at the end of the matrix
- *
- * Example: \include IOFormat.cpp
- * Output: \verbinclude IOFormat.out
- *
- * \sa DenseBase::format(), class WithFormat
- */
-struct IOFormat
-{
- /** Default constructor, see class IOFormat for the meaning of the parameters */
- IOFormat(int _precision = StreamPrecision, int _flags = 0,
- const std::string& _coeffSeparator = " ",
- const std::string& _rowSeparator = "\n", const std::string& _rowPrefix="", const std::string& _rowSuffix="",
- const std::string& _matPrefix="", const std::string& _matSuffix="")
- : matPrefix(_matPrefix), matSuffix(_matSuffix), rowPrefix(_rowPrefix), rowSuffix(_rowSuffix), rowSeparator(_rowSeparator),
- rowSpacer(""), coeffSeparator(_coeffSeparator), precision(_precision), flags(_flags)
- {
- // TODO check if rowPrefix, rowSuffix or rowSeparator contains a newline
- // don't add rowSpacer if columns are not to be aligned
- if((flags & DontAlignCols))
- return;
- int i = int(matSuffix.length())-1;
- while (i>=0 && matSuffix[i]!='\n')
- {
- rowSpacer += ' ';
- i--;
- }
- }
- std::string matPrefix, matSuffix;
- std::string rowPrefix, rowSuffix, rowSeparator, rowSpacer;
- std::string coeffSeparator;
- int precision;
- int flags;
-};
-
-/** \class WithFormat
- * \ingroup Core_Module
- *
- * \brief Pseudo expression providing matrix output with given format
- *
- * \tparam ExpressionType the type of the object on which IO stream operations are performed
- *
- * This class represents an expression with stream operators controlled by a given IOFormat.
- * It is the return type of DenseBase::format()
- * and most of the time this is the only way it is used.
- *
- * See class IOFormat for some examples.
- *
- * \sa DenseBase::format(), class IOFormat
- */
-template<typename ExpressionType>
-class WithFormat
-{
- public:
-
- WithFormat(const ExpressionType& matrix, const IOFormat& format)
- : m_matrix(matrix), m_format(format)
- {}
-
- friend std::ostream & operator << (std::ostream & s, const WithFormat& wf)
- {
- return internal::print_matrix(s, wf.m_matrix.eval(), wf.m_format);
- }
-
- protected:
- typename ExpressionType::Nested m_matrix;
- IOFormat m_format;
-};
-
-namespace internal {
-
-// NOTE: This helper is kept for backward compatibility with previous code specializing
-// this internal::significant_decimals_impl structure. In the future we should directly
-// call digits10() which has been introduced in July 2016 in 3.3.
-template<typename Scalar>
-struct significant_decimals_impl
-{
- static inline int run()
- {
- return NumTraits<Scalar>::digits10();
- }
-};
-
-/** \internal
- * print the matrix \a _m to the output stream \a s using the output format \a fmt */
-template<typename Derived>
-std::ostream & print_matrix(std::ostream & s, const Derived& _m, const IOFormat& fmt)
-{
- if(_m.size() == 0)
- {
- s << fmt.matPrefix << fmt.matSuffix;
- return s;
- }
-
- typename Derived::Nested m = _m;
- typedef typename Derived::Scalar Scalar;
-
- Index width = 0;
-
- std::streamsize explicit_precision;
- if(fmt.precision == StreamPrecision)
- {
- explicit_precision = 0;
- }
- else if(fmt.precision == FullPrecision)
- {
- if (NumTraits<Scalar>::IsInteger)
- {
- explicit_precision = 0;
- }
- else
- {
- explicit_precision = significant_decimals_impl<Scalar>::run();
- }
- }
- else
- {
- explicit_precision = fmt.precision;
- }
-
- std::streamsize old_precision = 0;
- if(explicit_precision) old_precision = s.precision(explicit_precision);
-
- bool align_cols = !(fmt.flags & DontAlignCols);
- if(align_cols)
- {
- // compute the largest width
- for(Index j = 0; j < m.cols(); ++j)
- for(Index i = 0; i < m.rows(); ++i)
- {
- std::stringstream sstr;
- sstr.copyfmt(s);
- sstr << m.coeff(i,j);
- width = std::max<Index>(width, Index(sstr.str().length()));
- }
- }
- s << fmt.matPrefix;
- for(Index i = 0; i < m.rows(); ++i)
- {
- if (i)
- s << fmt.rowSpacer;
- s << fmt.rowPrefix;
- if(width) s.width(width);
- s << m.coeff(i, 0);
- for(Index j = 1; j < m.cols(); ++j)
- {
- s << fmt.coeffSeparator;
- if (width) s.width(width);
- s << m.coeff(i, j);
- }
- s << fmt.rowSuffix;
- if( i < m.rows() - 1)
- s << fmt.rowSeparator;
- }
- s << fmt.matSuffix;
- if(explicit_precision) s.precision(old_precision);
- return s;
-}
-
-} // end namespace internal
-
-/** \relates DenseBase
- *
- * Outputs the matrix, to the given stream.
- *
- * If you wish to print the matrix with a format different than the default, use DenseBase::format().
- *
- * It is also possible to change the default format by defining EIGEN_DEFAULT_IO_FORMAT before including Eigen headers.
- * If not defined, this will automatically be defined to Eigen::IOFormat(), that is the Eigen::IOFormat with default parameters.
- *
- * \sa DenseBase::format()
- */
-template<typename Derived>
-std::ostream & operator <<
-(std::ostream & s,
- const DenseBase<Derived> & m)
-{
- return internal::print_matrix(s, m.eval(), EIGEN_DEFAULT_IO_FORMAT);
-}
-
-} // end namespace Eigen
-
-#endif // EIGEN_IO_H
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