sl@0: ///////////////////////////////////////////////////////////////////////////////
sl@0: /// \file regex_compiler.hpp
sl@0: /// Contains the definition of regex_compiler, a factory for building regex objects
sl@0: /// from strings.
sl@0: //
sl@0: //  Copyright 2004 Eric Niebler. Distributed under the Boost
sl@0: //  Software License, Version 1.0. (See accompanying file
sl@0: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
sl@0: 
sl@0: #ifndef BOOST_XPRESSIVE_REGEX_COMPILER_HPP_EAN_10_04_2005
sl@0: #define BOOST_XPRESSIVE_REGEX_COMPILER_HPP_EAN_10_04_2005
sl@0: 
sl@0: // MS compatible compilers support #pragma once
sl@0: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
sl@0: # pragma once
sl@0: #endif
sl@0: 
sl@0: #include <boost/xpressive/basic_regex.hpp>
sl@0: #include <boost/xpressive/detail/dynamic/parser.hpp>
sl@0: #include <boost/xpressive/detail/dynamic/parse_charset.hpp>
sl@0: #include <boost/xpressive/detail/dynamic/parser_enum.hpp>
sl@0: #include <boost/xpressive/detail/dynamic/parser_traits.hpp>
sl@0: #include <boost/xpressive/detail/core/linker.hpp>
sl@0: #include <boost/xpressive/detail/core/optimize.hpp>
sl@0: 
sl@0: namespace boost { namespace xpressive
sl@0: {
sl@0: 
sl@0: ///////////////////////////////////////////////////////////////////////////////
sl@0: // regex_compiler
sl@0: //
sl@0: /// \brief Class template regex_compiler is a factory for building basic_regex objects from a string.
sl@0: ///
sl@0: /// Class template regex_compiler is used to construct a basic_regex object from a string. The string
sl@0: /// should contain a valid regular expression. You can imbue a regex_compiler object with a locale,
sl@0: /// after which all basic_regex objects created with that regex_compiler object will use that locale.
sl@0: /// After creating a regex_compiler object, and optionally imbueing it with a locale, you can call the
sl@0: /// compile() method to construct a basic_regex object, passing it the string representing the regular
sl@0: /// expression. You can call compile() multiple times on the same regex_compiler object. Two basic_regex
sl@0: /// objects compiled from the same string will have different regex_id's.
sl@0: template<typename BidiIter, typename RegexTraits, typename CompilerTraits>
sl@0: struct regex_compiler
sl@0: {
sl@0:     typedef BidiIter iterator_type;
sl@0:     typedef typename iterator_value<BidiIter>::type char_type;
sl@0:     typedef std::basic_string<char_type> string_type;
sl@0:     typedef regex_constants::syntax_option_type flag_type;
sl@0:     typedef RegexTraits traits_type;
sl@0:     typedef typename traits_type::char_class_type char_class_type;
sl@0:     typedef typename traits_type::locale_type locale_type;
sl@0: 
sl@0:     explicit regex_compiler(RegexTraits const &traits = RegexTraits())
sl@0:       : mark_count_(0)
sl@0:       , hidden_mark_count_(0)
sl@0:       , traits_(traits)
sl@0:       , upper_(0)
sl@0:     {
sl@0:         this->upper_ = lookup_classname(this->rxtraits(), "upper");
sl@0:         BOOST_ASSERT(0 != this->upper_);
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // imbue
sl@0:     /// Specify the locale to be used by a regex_compiler.
sl@0:     ///
sl@0:     /// \param loc The locale that this regex_compiler should use.
sl@0:     /// \return The previous locale.
sl@0:     locale_type imbue(locale_type loc)
sl@0:     {
sl@0:         locale_type oldloc = this->traits_.imbue(loc);
sl@0:         this->upper_ = lookup_classname(this->rxtraits(), "upper");
sl@0:         BOOST_ASSERT(0 != this->upper_);
sl@0:         return oldloc;
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // getloc
sl@0:     /// Get the locale used by a regex_compiler.
sl@0:     ///
sl@0:     /// \param loc The locale that this regex_compiler uses.
sl@0:     locale_type getloc() const
sl@0:     {
sl@0:         return this->traits_.getloc();
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // compile
sl@0:     /// Builds a basic_regex object from a std::string.
sl@0:     ///
sl@0:     /// \param  pat A std::string containing the regular expression pattern.
sl@0:     /// \param  flags Optional bitmask that determines how the pat string is interpreted. (See syntax_option_type.)
sl@0:     /// \return A basic_regex object corresponding to the regular expression represented by the string.
sl@0:     /// \pre    The std::string pat contains a valid string-based representation of a regular expression.
sl@0:     /// \throw  regex_error when the string has invalid regular expression syntax.
sl@0:     basic_regex<BidiIter> compile(string_type pat, flag_type flags = regex_constants::ECMAScript)
sl@0:     {
sl@0:         this->reset();
sl@0:         this->traits_.flags(flags);
sl@0: 
sl@0:         string_iterator begin = pat.begin(), end = pat.end();
sl@0: 
sl@0:         // at the top level, a regex is a sequence of alternates
sl@0:         alternates_list alternates;
sl@0:         this->parse_alternates(begin, end, alternates);
sl@0:         detail::ensure(begin == end, regex_constants::error_paren, "mismatched parenthesis");
sl@0: 
sl@0:         // convert the alternates list to the appropriate matcher and terminate the sequence
sl@0:         detail::sequence<BidiIter> seq = detail::alternates_to_matchable(alternates, alternates_factory());
sl@0:         seq += detail::make_dynamic_xpression<BidiIter>(detail::end_matcher());
sl@0: 
sl@0:         // fill in the back-pointers by visiting the regex parse tree
sl@0:         detail::xpression_linker<char_type> linker(this->rxtraits());
sl@0:         seq.first->link(linker);
sl@0: 
sl@0:         // bundle the regex information into a regex_impl object
sl@0:         detail::regex_impl<BidiIter> impl;
sl@0:         impl.xpr_ = seq.first;
sl@0:         impl.traits_.reset(new RegexTraits(this->rxtraits()));
sl@0:         impl.mark_count_ = this->mark_count_;
sl@0:         impl.hidden_mark_count_ = this->hidden_mark_count_;
sl@0: 
sl@0:         // optimization: get the peek chars OR the boyer-moore search string
sl@0:         detail::optimize_regex(impl, this->rxtraits(), detail::is_random<BidiIter>());
sl@0: 
sl@0:         return detail::core_access<BidiIter>::make_regex(impl);
sl@0:     }
sl@0: 
sl@0: private:
sl@0: 
sl@0:     typedef typename string_type::const_iterator string_iterator;
sl@0:     typedef std::list<detail::sequence<BidiIter> > alternates_list;
sl@0:     typedef detail::escape_value<char_type, char_class_type> escape_value;
sl@0:     typedef detail::alternates_factory_impl<BidiIter, traits_type> alternates_factory;
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // reset
sl@0:     /// INTERNAL ONLY
sl@0:     void reset()
sl@0:     {
sl@0:         this->mark_count_ = 0;
sl@0:         this->hidden_mark_count_ = 0;
sl@0:         this->traits_.flags(regex_constants::ECMAScript);
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // regex_traits
sl@0:     /// INTERNAL ONLY
sl@0:     traits_type &rxtraits()
sl@0:     {
sl@0:         return this->traits_.traits();
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // regex_traits
sl@0:     /// INTERNAL ONLY
sl@0:     traits_type const &rxtraits() const
sl@0:     {
sl@0:         return this->traits_.traits();
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // parse_alternates
sl@0:     /// INTERNAL ONLY
sl@0:     void parse_alternates(string_iterator &begin, string_iterator end, alternates_list &alternates)
sl@0:     {
sl@0:         using namespace regex_constants;
sl@0:         string_iterator old_begin;
sl@0: 
sl@0:         do
sl@0:         {
sl@0:             alternates.push_back(this->parse_sequence(begin, end));
sl@0:             old_begin = begin;
sl@0:         }
sl@0:         while(begin != end && token_alternate == this->traits_.get_token(begin, end));
sl@0: 
sl@0:         begin = old_begin;
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // parse_group
sl@0:     /// INTERNAL ONLY
sl@0:     detail::sequence<BidiIter> parse_group(string_iterator &begin, string_iterator end)
sl@0:     {
sl@0:         using namespace regex_constants;
sl@0:         int mark_nbr = 0;
sl@0:         bool keeper = false;
sl@0:         bool lookahead = false;
sl@0:         bool lookbehind = false;
sl@0:         bool negative = false;
sl@0:         std::size_t old_mark_count = this->mark_count_;
sl@0: 
sl@0:         detail::sequence<BidiIter> seq, seq_end;
sl@0:         string_iterator tmp = string_iterator();
sl@0: 
sl@0:         syntax_option_type old_flags = this->traits_.flags();
sl@0: 
sl@0:         switch(this->traits_.get_group_type(begin, end))
sl@0:         {
sl@0:         case token_no_mark:
sl@0:             // Don't process empty groups like (?:) or (?i)
sl@0:             // BUGBUG this doesn't handle the degenerate (?:)+ correctly
sl@0:             if(token_group_end == this->traits_.get_token(tmp = begin, end))
sl@0:             {
sl@0:                 return this->parse_atom(begin = tmp, end);
sl@0:             }
sl@0:             break;
sl@0: 
sl@0:         case token_negative_lookahead:
sl@0:             negative = true; // fall-through
sl@0:         case token_positive_lookahead:
sl@0:             lookahead = true;
sl@0:             seq_end = detail::make_dynamic_xpression<BidiIter>(detail::true_matcher());
sl@0:             break;
sl@0: 
sl@0:         case token_negative_lookbehind:
sl@0:             negative = true; // fall-through
sl@0:         case token_positive_lookbehind:
sl@0:             lookbehind = true;
sl@0:             seq_end = detail::make_dynamic_xpression<BidiIter>(detail::true_matcher());
sl@0:             break;
sl@0: 
sl@0:         case token_independent_sub_expression:
sl@0:             keeper = true;
sl@0:             seq_end = detail::make_dynamic_xpression<BidiIter>(detail::true_matcher());
sl@0:             break;
sl@0: 
sl@0:         case token_comment:
sl@0:             while(detail::ensure(begin != end, error_paren, "mismatched parenthesis"))
sl@0:             {
sl@0:                 switch(this->traits_.get_token(begin, end))
sl@0:                 {
sl@0:                 case token_group_end: return this->parse_atom(begin, end);
sl@0:                 case token_escape: detail::ensure(begin != end, error_escape, "incomplete escape sequence");
sl@0:                 case token_literal: ++begin;
sl@0:                 default:;
sl@0:                 }
sl@0:             }
sl@0:             break;
sl@0: 
sl@0:         default:
sl@0:             mark_nbr = static_cast<int>(++this->mark_count_);
sl@0:             seq = detail::make_dynamic_xpression<BidiIter>(detail::mark_begin_matcher(mark_nbr));
sl@0:             seq_end = detail::make_dynamic_xpression<BidiIter>(detail::mark_end_matcher(mark_nbr));
sl@0:             break;
sl@0:         }
sl@0: 
sl@0:         // alternates
sl@0:         alternates_list alternates;
sl@0:         this->parse_alternates(begin, end, alternates);
sl@0:         detail::ensure
sl@0:         (
sl@0:             begin != end && token_group_end == this->traits_.get_token(begin, end)
sl@0:           , error_paren
sl@0:           , "mismatched parenthesis"
sl@0:         );
sl@0: 
sl@0:         seq += detail::alternates_to_matchable(alternates, alternates_factory());
sl@0:         seq += seq_end;
sl@0: 
sl@0:         typedef shared_ptr<detail::matchable<BidiIter> const> xpr_type;
sl@0:         bool do_save = (this->mark_count_ != old_mark_count);
sl@0: 
sl@0:         if(lookahead)
sl@0:         {
sl@0:             detail::lookahead_matcher<xpr_type> lookahead(seq.first, negative, do_save);
sl@0:             seq = detail::make_dynamic_xpression<BidiIter>(lookahead);
sl@0:         }
sl@0:         else if(lookbehind)
sl@0:         {
sl@0:             detail::lookbehind_matcher<xpr_type> lookbehind(seq.first, negative, do_save);
sl@0:             seq = detail::make_dynamic_xpression<BidiIter>(lookbehind);
sl@0:         }
sl@0:         else if(keeper) // independent sub-expression
sl@0:         {
sl@0:             detail::keeper_matcher<xpr_type> keeper(seq.first, do_save);
sl@0:             seq = detail::make_dynamic_xpression<BidiIter>(keeper);
sl@0:         }
sl@0: 
sl@0:         // restore the modifiers
sl@0:         this->traits_.flags(old_flags);
sl@0:         return seq;
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // parse_charset
sl@0:     /// INTERNAL ONLY
sl@0:     detail::sequence<BidiIter> parse_charset(string_iterator &begin, string_iterator end)
sl@0:     {
sl@0:         detail::compound_charset<traits_type> chset;
sl@0: 
sl@0:         // call out to a helper to actually parse the character set
sl@0:         detail::parse_charset(begin, end, chset, this->traits_);
sl@0: 
sl@0:         return detail::make_charset_xpression<BidiIter>
sl@0:         (
sl@0:             chset
sl@0:           , this->rxtraits()
sl@0:           , this->traits_.flags()
sl@0:         );
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // parse_atom
sl@0:     /// INTERNAL ONLY
sl@0:     detail::sequence<BidiIter> parse_atom(string_iterator &begin, string_iterator end)
sl@0:     {
sl@0:         using namespace regex_constants;
sl@0:         escape_value esc = { 0, 0, 0, detail::escape_char };
sl@0:         string_iterator old_begin = begin;
sl@0: 
sl@0:         switch(this->traits_.get_token(begin, end))
sl@0:         {
sl@0:         case token_literal:
sl@0:             return detail::make_literal_xpression<BidiIter>
sl@0:             (
sl@0:                 this->parse_literal(begin, end), this->traits_.flags(), this->rxtraits()
sl@0:             );
sl@0: 
sl@0:         case token_any:
sl@0:             return detail::make_any_xpression<BidiIter>(this->traits_.flags(), this->rxtraits());
sl@0: 
sl@0:         case token_assert_begin_sequence:
sl@0:             return detail::make_dynamic_xpression<BidiIter>(detail::assert_bos_matcher());
sl@0: 
sl@0:         case token_assert_end_sequence:
sl@0:             return detail::make_dynamic_xpression<BidiIter>(detail::assert_eos_matcher());
sl@0: 
sl@0:         case token_assert_begin_line:
sl@0:             return detail::make_assert_begin_line<BidiIter>(this->traits_.flags(), this->rxtraits());
sl@0: 
sl@0:         case token_assert_end_line:
sl@0:             return detail::make_assert_end_line<BidiIter>(this->traits_.flags(), this->rxtraits());
sl@0: 
sl@0:         case token_assert_word_boundary:
sl@0:             return detail::make_assert_word<BidiIter>(detail::word_boundary<true>(), this->rxtraits());
sl@0: 
sl@0:         case token_assert_not_word_boundary:
sl@0:             return detail::make_assert_word<BidiIter>(detail::word_boundary<false>(), this->rxtraits());
sl@0: 
sl@0:         case token_assert_word_begin:
sl@0:             return detail::make_assert_word<BidiIter>(detail::word_begin(), this->rxtraits());
sl@0: 
sl@0:         case token_assert_word_end:
sl@0:             return detail::make_assert_word<BidiIter>(detail::word_end(), this->rxtraits());
sl@0: 
sl@0:         case token_escape:
sl@0:             esc = this->parse_escape(begin, end);
sl@0:             switch(esc.type_)
sl@0:             {
sl@0:             case detail::escape_mark:
sl@0:                 return detail::make_backref_xpression<BidiIter>
sl@0:                 (
sl@0:                     esc.mark_nbr_, this->traits_.flags(), this->rxtraits()
sl@0:                 );
sl@0:             case detail::escape_char:
sl@0:                 return detail::make_char_xpression<BidiIter>
sl@0:                 (
sl@0:                     esc.ch_, this->traits_.flags(), this->rxtraits()
sl@0:                 );
sl@0:             case detail::escape_class:
sl@0:                 return detail::make_posix_charset_xpression<BidiIter>
sl@0:                 (
sl@0:                     esc.class_
sl@0:                   , this->rxtraits().isctype(*begin++, this->upper_)
sl@0:                   , this->traits_.flags()
sl@0:                   , this->rxtraits()
sl@0:                 );
sl@0:             }
sl@0: 
sl@0:         case token_group_begin:
sl@0:             return this->parse_group(begin, end);
sl@0: 
sl@0:         case token_charset_begin:
sl@0:             return this->parse_charset(begin, end);
sl@0: 
sl@0:         case token_invalid_quantifier:
sl@0:             throw regex_error(error_badrepeat, "quantifier not expected");
sl@0: 
sl@0:         case token_quote_meta_begin:
sl@0:             return detail::make_literal_xpression<BidiIter>
sl@0:             (
sl@0:                 this->parse_quote_meta(begin, end), this->traits_.flags(), this->rxtraits()
sl@0:             );
sl@0: 
sl@0:         case token_quote_meta_end:
sl@0:             throw regex_error
sl@0:             (
sl@0:                 error_escape
sl@0:               , "found quote-meta end without corresponding quote-meta begin"
sl@0:             );
sl@0: 
sl@0:         case token_end_of_pattern:
sl@0:             break;
sl@0: 
sl@0:         default:
sl@0:             begin = old_begin;
sl@0:             break;
sl@0:         }
sl@0: 
sl@0:         return detail::sequence<BidiIter>();
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // parse_quant
sl@0:     /// INTERNAL ONLY
sl@0:     detail::sequence<BidiIter> parse_quant(string_iterator &begin, string_iterator end)
sl@0:     {
sl@0:         BOOST_ASSERT(begin != end);
sl@0:         detail::quant_spec spec = { 0, 0, false };
sl@0:         detail::sequence<BidiIter> seq = this->parse_atom(begin, end);
sl@0: 
sl@0:         // BUGBUG this doesn't handle the degenerate (?:)+ correctly
sl@0:         if(!seq.is_empty() && begin != end && seq.first->is_quantifiable())
sl@0:         {
sl@0:             if(this->traits_.get_quant_spec(begin, end, spec))
sl@0:             {
sl@0:                 BOOST_ASSERT(spec.min_ <= spec.max_);
sl@0: 
sl@0:                 if(0 == spec.max_) // quant {0,0} is degenerate -- matches nothing.
sl@0:                 {
sl@0:                     seq = this->parse_quant(begin, end);
sl@0:                 }
sl@0:                 else
sl@0:                 {
sl@0:                     seq = seq.first->quantify(spec, this->hidden_mark_count_, seq, alternates_factory());
sl@0:                 }
sl@0:             }
sl@0:         }
sl@0: 
sl@0:         return seq;
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // parse_sequence
sl@0:     /// INTERNAL ONLY
sl@0:     detail::sequence<BidiIter> parse_sequence(string_iterator &begin, string_iterator end)
sl@0:     {
sl@0:         detail::sequence<BidiIter> seq;
sl@0: 
sl@0:         while(begin != end)
sl@0:         {
sl@0:             detail::sequence<BidiIter> seq_quant = this->parse_quant(begin, end);
sl@0: 
sl@0:             // did we find a quantified atom?
sl@0:             if(seq_quant.is_empty())
sl@0:                 break;
sl@0: 
sl@0:             // chain it to the end of the xpression sequence
sl@0:             seq += seq_quant;
sl@0:         }
sl@0: 
sl@0:         return seq;
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // parse_literal
sl@0:     //  scan ahead looking for char literals to be globbed together into a string literal
sl@0:     /// INTERNAL ONLY
sl@0:     string_type parse_literal(string_iterator &begin, string_iterator end)
sl@0:     {
sl@0:         using namespace regex_constants;
sl@0:         BOOST_ASSERT(begin != end);
sl@0:         BOOST_ASSERT(token_literal == this->traits_.get_token(begin, end));
sl@0:         escape_value esc = { 0, 0, 0, detail::escape_char };
sl@0:         string_type literal(1, *begin);
sl@0: 
sl@0:         for(string_iterator prev = begin, tmp = ++begin; begin != end; prev = begin, begin = tmp)
sl@0:         {
sl@0:             detail::quant_spec spec;
sl@0:             if(this->traits_.get_quant_spec(tmp, end, spec))
sl@0:             {
sl@0:                 if(literal.size() != 1)
sl@0:                 {
sl@0:                     begin = prev;
sl@0:                     literal.erase(literal.size() - 1);
sl@0:                 }
sl@0:                 return literal;
sl@0:             }
sl@0:             else switch(this->traits_.get_token(tmp, end))
sl@0:             {
sl@0:             case token_escape:
sl@0:                 esc = this->parse_escape(tmp, end);
sl@0:                 if(detail::escape_char != esc.type_) return literal;
sl@0:                 literal += esc.ch_;
sl@0:                 break;
sl@0:             case token_literal:
sl@0:                 literal += *tmp++;
sl@0:                 break;
sl@0:             default:
sl@0:                 return literal;
sl@0:             }
sl@0:         }
sl@0: 
sl@0:         return literal;
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////
sl@0:     // parse_quote_meta
sl@0:     //  scan ahead looking for char literals to be globbed together into a string literal
sl@0:     /// INTERNAL ONLY
sl@0:     string_type parse_quote_meta(string_iterator &begin, string_iterator end)
sl@0:     {
sl@0:         using namespace regex_constants;
sl@0:         string_iterator old_begin = begin, old_end;
sl@0:         while(end != (old_end = begin))
sl@0:         {
sl@0:             switch(this->traits_.get_token(begin, end))
sl@0:             {
sl@0:             case token_quote_meta_end: return string_type(old_begin, old_end);
sl@0:             case token_escape: detail::ensure(begin != end, error_escape, "incomplete escape sequence");
sl@0:             case token_literal: ++begin;
sl@0:             default:;
sl@0:             }
sl@0:         }
sl@0:         return string_type(old_begin, begin);
sl@0:     }
sl@0: 
sl@0:     ///////////////////////////////////////////////////////////////////////////////
sl@0:     // parse_escape
sl@0:     /// INTERNAL ONLY
sl@0:     escape_value parse_escape(string_iterator &begin, string_iterator end)
sl@0:     {
sl@0:         detail::ensure(begin != end, regex_constants::error_escape, "incomplete escape sequence");
sl@0: 
sl@0:         // first, check to see if this can be a backreference
sl@0:         if(0 < this->rxtraits().value(*begin, 10))
sl@0:         {
sl@0:             // Parse at most 3 decimal digits.
sl@0:             string_iterator tmp = begin;
sl@0:             int mark_nbr = detail::toi(tmp, end, this->rxtraits(), 10, 999);
sl@0: 
sl@0:             // If the resulting number could conceivably be a backref, then it is.
sl@0:             if(10 > mark_nbr || mark_nbr <= static_cast<int>(this->mark_count_))
sl@0:             {
sl@0:                 begin = tmp;
sl@0:                 escape_value esc = {0, mark_nbr, 0, detail::escape_mark};
sl@0:                 return esc;
sl@0:             }
sl@0:         }
sl@0: 
sl@0:         // Not a backreference, defer to the parse_escape helper
sl@0:         return detail::parse_escape(begin, end, this->traits_);
sl@0:     }
sl@0: 
sl@0:     std::size_t mark_count_;
sl@0:     std::size_t hidden_mark_count_;
sl@0:     CompilerTraits traits_;
sl@0:     typename RegexTraits::char_class_type upper_;
sl@0: };
sl@0: 
sl@0: }} // namespace boost::xpressive
sl@0: 
sl@0: #endif