regex.hpp

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//  Boost string_algo library regex.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_REGEX_HPP
#define BOOST_STRING_REGEX_HPP

#include <boost/algorithm/string/config.hpp>
#include <boost/regex.hpp>

#include <boost/range/iterator_range.hpp>
#include <boost/range/begin.hpp>
#include <boost/range/end.hpp>
#include <boost/range/iterator.hpp>
#include <boost/range/as_literal.hpp>

#include <boost/algorithm/string/find_format.hpp>
#include <boost/algorithm/string/regex_find_format.hpp>
#include <boost/algorithm/string/formatter.hpp>
#include <boost/algorithm/string/iter_find.hpp>

/*! \file
    Defines regex variants of the algorithms. 
*/

namespace boost {
    namespace algorithm {

//  find_regex  -----------------------------------------------//

        //! Find regex algorithm
        /*!
            Search for a substring matching the given regex in the input.
            
            \param Input A container which will be searched.
            \param Rx A regular expression
            \param Flags Regex options
            \return 
                An \c iterator_range delimiting the match. 
                Returned iterator is either \c RangeT::iterator or 
                \c RangeT::const_iterator, depending on the constness of 
                the input parameter.

              \note This function provides the strong exception-safety guarantee
        */
        template< 
            typename RangeT, 
            typename CharT, 
            typename RegexTraitsT>
        inline iterator_range< 
            BOOST_STRING_TYPENAME range_iterator<RangeT>::type >
        find_regex( 
            RangeT& Input, 
            const basic_regex<CharT, RegexTraitsT>& Rx,
            match_flag_type Flags=match_default )
        {
            iterator_range<BOOST_STRING_TYPENAME range_iterator<RangeT>::type> lit_input(as_literal(Input));

            return regex_finder(Rx,Flags)(
                ::boost::begin(lit_input), ::boost::end(lit_input) );
        }

//  replace_regex --------------------------------------------------------------------//

        //! Replace regex algorithm
        /*!
            Search for a substring matching given regex and format it with 
            the specified format.             
            The result is a modified 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 string
            \param Rx A regular expression
            \param Format Regex format definition
            \param Flags Regex options
            \return An output iterator pointing just after the last inserted character or
                    a modified copy of the input   

             \note The second variant of this function provides the strong exception-safety guarantee
        */
        template< 
            typename OutputIteratorT,
            typename RangeT, 
            typename CharT, 
            typename RegexTraitsT,
            typename FormatStringTraitsT, typename FormatStringAllocatorT >
        inline OutputIteratorT replace_regex_copy(
            OutputIteratorT Output,
            const RangeT& Input,
            const basic_regex<CharT, RegexTraitsT>& Rx,
            const std::basic_string<CharT, FormatStringTraitsT, FormatStringAllocatorT>& Format,
            match_flag_type Flags=match_default | format_default )
        {
            return find_format_copy( 
                Output,
                Input,
                regex_finder( Rx, Flags ),
                regex_formatter( Format, Flags ) );
        }

        //! Replace regex algorithm
        /*!
            \overload
        */
        template< 
            typename SequenceT, 
            typename CharT, 
            typename RegexTraitsT,
            typename FormatStringTraitsT, typename FormatStringAllocatorT >
        inline SequenceT replace_regex_copy( 
            const SequenceT& Input,
            const basic_regex<CharT, RegexTraitsT>& Rx,
            const std::basic_string<CharT, FormatStringTraitsT, FormatStringAllocatorT>& Format,
            match_flag_type Flags=match_default | format_default )
        {
            return find_format_copy( 
                Input,
                regex_finder( Rx, Flags ),
                regex_formatter( Format, Flags ) );
        }

        //! Replace regex algorithm
        /*!
            Search for a substring matching given regex and format it with 
            the specified format. The input string is modified in-place.

            \param Input An input string
            \param Rx A regular expression
            \param Format Regex format definition
            \param Flags Regex options
        */
        template< 
            typename SequenceT, 
            typename CharT, 
            typename RegexTraitsT,
            typename FormatStringTraitsT, typename FormatStringAllocatorT >
        inline void replace_regex( 
            SequenceT& Input,
            const basic_regex<CharT, RegexTraitsT>& Rx,
            const std::basic_string<CharT, FormatStringTraitsT, FormatStringAllocatorT>& Format,
            match_flag_type Flags=match_default | format_default )
        {
            find_format( 
                Input,
                regex_finder( Rx, Flags ),
                regex_formatter( Format, Flags ) );
        }

//  replace_all_regex --------------------------------------------------------------------//

        //! Replace all regex algorithm
        /*!
            Format all substrings, matching given regex, with the specified format. 
            The result is a modified 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 string
            \param Rx A regular expression
            \param Format Regex format definition
            \param Flags Regex options
            \return An output iterator pointing just after the last inserted character or
                    a modified copy of the input     

              \note The second variant of this function provides the strong exception-safety guarantee
        */
        template< 
            typename OutputIteratorT,
            typename RangeT, 
            typename CharT, 
            typename RegexTraitsT,
            typename FormatStringTraitsT, typename FormatStringAllocatorT >
        inline OutputIteratorT replace_all_regex_copy(
            OutputIteratorT Output,
            const RangeT& Input,
            const basic_regex<CharT, RegexTraitsT>& Rx,
            const std::basic_string<CharT, FormatStringTraitsT, FormatStringAllocatorT>& Format,
            match_flag_type Flags=match_default | format_default )
        {
            return find_format_all_copy( 
                Output,
                Input,
                regex_finder( Rx, Flags ),
                regex_formatter( Format, Flags ) );
        }

        //! Replace all regex algorithm
        /*!
            \overload
        */
        template< 
            typename SequenceT, 
            typename CharT, 
            typename RegexTraitsT,
            typename FormatStringTraitsT, typename FormatStringAllocatorT >
        inline SequenceT replace_all_regex_copy( 
            const SequenceT& Input,
            const basic_regex<CharT, RegexTraitsT>& Rx,
            const std::basic_string<CharT, FormatStringTraitsT, FormatStringAllocatorT>& Format,
            match_flag_type Flags=match_default | format_default )
        {
            return find_format_all_copy( 
                Input,
                regex_finder( Rx, Flags ),
                regex_formatter( Format, Flags ) );
        }

        //! Replace all regex algorithm
        /*!
            Format all substrings, matching given regex, with the specified format. 
            The input string is modified in-place.

            \param Input An input string
            \param Rx A regular expression
            \param Format Regex format definition
            \param Flags Regex options            
        */
        template< 
            typename SequenceT, 
            typename CharT, 
            typename RegexTraitsT,
            typename FormatStringTraitsT, typename FormatStringAllocatorT >
        inline void replace_all_regex( 
            SequenceT& Input,
            const basic_regex<CharT, RegexTraitsT>& Rx,
            const std::basic_string<CharT, FormatStringTraitsT, FormatStringAllocatorT>& Format,
            match_flag_type Flags=match_default | format_default )
        {
            find_format_all( 
                Input,
                regex_finder( Rx, Flags ),
                regex_formatter( Format, Flags ) );
        }

//  erase_regex --------------------------------------------------------------------//

        //! Erase regex algorithm
        /*!
            Remove a substring matching given regex from the input.
            The result is a modified 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 string
            \param Rx A regular expression
            \param Flags Regex options
            \return An output iterator pointing just after the last inserted character or
                       a modified copy of the input    

             \note The second variant of this function provides the strong exception-safety guarantee
       */
        template< 
            typename OutputIteratorT,
            typename RangeT, 
            typename CharT, 
            typename RegexTraitsT >
        inline OutputIteratorT erase_regex_copy(
            OutputIteratorT Output,
            const RangeT& Input,
            const basic_regex<CharT, RegexTraitsT>& Rx,
            match_flag_type Flags=match_default )
        {
            return find_format_copy(
                Output,
                Input,
                regex_finder( Rx, Flags ),
                empty_formatter( Input ) );
        }

        //! Erase regex algorithm
        /*!
            \overload
        */
        template< 
            typename SequenceT, 
            typename CharT, 
            typename RegexTraitsT >
        inline SequenceT erase_regex_copy( 
            const SequenceT& Input,
            const basic_regex<CharT, RegexTraitsT>& Rx,
            match_flag_type Flags=match_default )
        {
            return find_format_copy( 
                Input, 
                regex_finder( Rx, Flags ),
                empty_formatter( Input ) );
        }

        //! Erase regex algorithm
        /*!
            Remove a substring matching given regex from the input.
            The input string is modified in-place.

            \param Input An input string
            \param Rx A regular expression
            \param Flags Regex options
        */
        template< 
            typename SequenceT, 
            typename CharT, 
            typename RegexTraitsT >
        inline void erase_regex( 
            SequenceT& Input,
            const basic_regex<CharT, RegexTraitsT>& Rx,
            match_flag_type Flags=match_default )
        {
            find_format( 
                Input, 
                regex_finder( Rx, Flags ),
                empty_formatter( Input ) );
        }

//  erase_all_regex --------------------------------------------------------------------//

        //! Erase all regex algorithm
        /*!
            Erase all substrings, matching given regex, from the input.