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// Boost string_algo library trim.hpp header file ---------------------------//
// Copyright Pavol Droba 2002-2003.
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/ for updates, documentation, and revision history.
#ifndef BOOST_STRING_TRIM_HPP
#define BOOST_STRING_TRIM_HPP
#include <boost/algorithm/string/config.hpp>
#include <boost/range/begin.hpp>
#include <boost/range/end.hpp>
#include <boost/range/const_iterator.hpp>
#include <boost/range/as_literal.hpp>
#include <boost/range/iterator_range_core.hpp>
#include <boost/algorithm/string/detail/trim.hpp>
#include <boost/algorithm/string/classification.hpp>
#include <locale>
/*! \file
Defines trim algorithms.
Trim algorithms are used to remove trailing and leading spaces from a
sequence (string). Space is recognized using given locales.
Parametric (\c _if) variants use a predicate (functor) to select which characters
are to be trimmed..
Functions take a selection predicate as a parameter, which is used to determine
whether a character is a space. Common predicates are provided in classification.hpp header.
*/
namespace boost {
namespace algorithm {
// left trim -----------------------------------------------//
//! Left trim - parametric
/*!
Remove all leading spaces from the input.
The supplied predicate is used to determine which characters are considered spaces.
The result is a trimmed copy of the input. It is returned as a sequence
or copied to the output iterator
\param Output An output iterator to which the result will be copied
\param Input An input range
\param IsSpace A unary predicate identifying spaces
\return
An output iterator pointing just after the last inserted character or
a copy of the input
\note The second variant of this function provides the strong exception-safety guarantee
*/
template<typename OutputIteratorT, typename RangeT, typename PredicateT>
inline OutputIteratorT trim_left_copy_if(
OutputIteratorT Output,
const RangeT& Input,
PredicateT IsSpace)
{
iterator_range<BOOST_STRING_TYPENAME range_const_iterator<RangeT>::type> lit_range(::boost::as_literal(Input));
std::copy(
::boost::algorithm::detail::trim_begin(
::boost::begin(lit_range),
::boost::end(lit_range),
IsSpace ),
::boost::end(lit_range),
Output);
return Output;
}
//! Left trim - parametric
/*!
\overload
*/
template<typename SequenceT, typename PredicateT>
inline SequenceT trim_left_copy_if(const SequenceT& Input, PredicateT IsSpace)
{
return SequenceT(
::boost::algorithm::detail::trim_begin(
::boost::begin(Input),
::boost::end(Input),
IsSpace ),
::boost::end(Input));
}
//! Left trim - parametric
/*!
Remove all leading spaces from the input.
The result is a trimmed copy of the input.
\param Input An input sequence
\param Loc a locale used for 'space' classification
\return A trimmed copy of the input
\note This function provides the strong exception-safety guarantee
*/
template<typename SequenceT>
inline SequenceT trim_left_copy(const SequenceT& Input, const std::locale& Loc=std::locale())
{
return
::boost::algorithm::trim_left_copy_if(
Input,
is_space(Loc));
}
//! Left trim
/*!
Remove all leading spaces from the input. The supplied predicate is
used to determine which characters are considered spaces.
The input sequence is modified in-place.
\param Input An input sequence
\param IsSpace A unary predicate identifying spaces
*/
template<typename SequenceT, typename PredicateT>
inline void trim_left_if(SequenceT& Input, PredicateT IsSpace)
{
Input.erase(
::boost::begin(Input),
::boost::algorithm::detail::trim_begin(
::boost::begin(Input),
::boost::end(Input),
IsSpace));
}
//! Left trim
/*!
Remove all leading spaces from the input.
The Input sequence is modified in-place.
\param Input An input sequence
\param Loc A locale used for 'space' classification
*/
template<typename SequenceT>
inline void trim_left(SequenceT& Input, const std::locale& Loc=std::locale())
{
::boost::algorithm::trim_left_if(
Input,
is_space(Loc));
}
// right trim -----------------------------------------------//
//! Right trim - parametric
/*!
Remove all trailing spaces from the input.
The supplied predicate is used to determine which characters are considered spaces.
The result is a trimmed copy of the input. It is returned as a sequence
or copied to the output iterator
\param Output An output iterator to which the result will be copied
\param Input An input range
\param IsSpace A unary predicate identifying spaces
\return
An output iterator pointing just after the last inserted character or
a copy of the input
\note The second variant of this function provides the strong exception-safety guarantee
*/
template<typename OutputIteratorT, typename RangeT, typename PredicateT>
inline OutputIteratorT trim_right_copy_if(
OutputIteratorT Output,
const RangeT& Input,
PredicateT IsSpace )
{
iterator_range<BOOST_STRING_TYPENAME range_const_iterator<RangeT>::type> lit_range(::boost::as_literal(Input));
std::copy(
::boost::begin(lit_range),
::boost::algorithm::detail::trim_end(
::boost::begin(lit_range),
::boost::end(lit_range),
IsSpace ),
Output );
return Output;
}
//! Right trim - parametric
/*!
\overload
*/
template<typename SequenceT, typename PredicateT>
inline SequenceT trim_right_copy_if(const SequenceT& Input, PredicateT IsSpace)
{
return SequenceT(
::boost::begin(Input),
::boost::algorithm::detail::trim_end(
::boost::begin(Input),
::boost::end(Input),
IsSpace)
);
}
//! Right trim
/*!
Remove all trailing spaces from the input.
The result is a trimmed copy of the input
\param Input An input sequence
\param Loc A locale used for 'space' classification
\return A trimmed copy of the input
\note This function provides the strong exception-safety guarantee
*/
template<typename SequenceT>
inline SequenceT trim_right_copy(const SequenceT& Input, const std::locale& Loc=std::locale())
{
return
::boost::algorithm::trim_right_copy_if(
Input,
is_space(Loc));
}
//! Right trim - parametric
/*!
Remove all trailing spaces from the input.
The supplied predicate is used to determine which characters are considered spaces.
The input sequence is modified in-place.
\param Input An input sequence
\param IsSpace A unary predicate identifying spaces
*/
template<typename SequenceT, typename PredicateT>
inline void trim_right_if(SequenceT& Input, PredicateT IsSpace)
{
Input.erase(
::boost::algorithm::detail::trim_end(
::boost::begin(Input),
::boost::end(Input),
IsSpace ),
::boost::end(Input)
);
}
//! Right trim
/*!
Remove all trailing spaces from the input.
The input sequence is modified in-place.
\param Input An input sequence
\param Loc A locale used for 'space' classification
*/
template<typename SequenceT>
inline void trim_right(SequenceT& Input, const std::locale& Loc=std::locale())
{
::boost::algorithm::trim_right_if(
Input,
is_space(Loc) );
}
// both side trim -----------------------------------------------//
//! Trim - parametric
/*!
Remove all trailing and leading spaces from the input.
The supplied predicate is used to determine which characters are considered spaces.
The result is a trimmed copy of the input. It is returned as a sequence
or copied to the output iterator
\param Output An output iterator to which the result will be copied
\param Input An input range
\param IsSpace A unary predicate identifying spaces
\return
An output iterator pointing just after the last inserted character or
a copy of the input
\note The second variant of this function provides the strong exception-safety guarantee
*/
template<typename OutputIteratorT, typename RangeT, typename PredicateT>
inline OutputIteratorT trim_copy_if(
OutputIteratorT Output,
const RangeT& Input,
PredicateT IsSpace)
{
iterator_range<BOOST_STRING_TYPENAME range_const_iterator<RangeT>::type> lit_range(::boost::as_literal(Input));
BOOST_STRING_TYPENAME
range_const_iterator<RangeT>::type TrimEnd=
::boost::algorithm::detail::trim_end(
::boost::begin(lit_range),
::boost::end(lit_range),
IsSpace);
std::copy(
detail::trim_begin(
::boost::begin(lit_range), TrimEnd, IsSpace),
TrimEnd,
Output
);
return Output;
}
//! Trim - parametric
/*!
\overload
*/
template<typename SequenceT, typename PredicateT>
inline SequenceT trim_copy_if(const SequenceT& Input, PredicateT IsSpace)
{
BOOST_STRING_TYPENAME
range_const_iterator<SequenceT>::type TrimEnd=
::boost::algorithm::detail::trim_end(
::boost::begin(Input),
::boost::end(Input),
IsSpace);
return SequenceT(
detail::trim_begin(
::boost::begin(Input),
TrimEnd,
IsSpace),
TrimEnd
);
}
//! Trim
/*!
Remove all leading and trailing spaces from the input.
The result is a trimmed copy of the input
\param Input An input sequence
\param Loc A locale used for 'space' classification
\return A trimmed copy of the input
\note This function provides the strong exception-safety guarantee
*/
template<typename SequenceT>
inline SequenceT trim_copy( const SequenceT& Input, const std::locale& Loc=std::locale() )
{
return
::boost::algorithm::trim_copy_if(
Input,
is_space(Loc) );
}
//! Trim
/*!
Remove all leading and trailing spaces from the input.
The supplied predicate is used to determine which characters are considered spaces.
The input sequence is modified in-place.
\param Input An input sequence
\param IsSpace A unary predicate identifying spaces
*/
template<typename SequenceT, typename PredicateT>
inline void trim_if(SequenceT& Input, PredicateT IsSpace)
{
::boost::algorithm::trim_right_if( Input, IsSpace );
::boost::algorithm::trim_left_if( Input, IsSpace );
}
//! Trim
/*!
Remove all leading and trailing spaces from the input.
The input sequence is modified in-place.
\param Input An input sequence
\param Loc A locale used for 'space' classification
*/
template<typename SequenceT>
inline void trim(SequenceT& Input, const std::locale& Loc=std::locale())
{
::boost::algorithm::trim_if(
Input,
is_space( Loc ) );
}
} // namespace algorithm
// pull names to the boost namespace
using algorithm::trim_left;
using algorithm::trim_left_if;
using algorithm::trim_left_copy;
using algorithm::trim_left_copy_if;
using algorithm::trim_right;
using algorithm::trim_right_if;
using algorithm::trim_right_copy;
using algorithm::trim_right_copy_if;
using algorithm::trim;
using algorithm::trim_if;
using algorithm::trim_copy;
using algorithm::trim_copy_if;
} // namespace boost
#endif // BOOST_STRING_TRIM_HPP
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