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