123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125 |
- ///////////////////////////////////////////////////////////////////////////////
- // assert_word_matcher.hpp
- //
- // Copyright 2008 Eric Niebler. 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)
- #ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ASSERT_WORD_MATCHER_HPP_EAN_10_04_2005
- #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ASSERT_WORD_MATCHER_HPP_EAN_10_04_2005
- // MS compatible compilers support #pragma once
- #if defined(_MSC_VER)
- # pragma once
- #endif
- #include <boost/assert.hpp>
- #include <boost/xpressive/detail/detail_fwd.hpp>
- #include <boost/xpressive/detail/core/quant_style.hpp>
- #include <boost/xpressive/detail/utility/ignore_unused.hpp>
- #include <boost/xpressive/detail/core/state.hpp>
- namespace boost { namespace xpressive { namespace detail
- {
- ///////////////////////////////////////////////////////////////////////////////
- // word_boundary
- //
- template<typename IsBoundary>
- struct word_boundary
- {
- template<typename BidiIter>
- static bool eval(bool prevword, bool thisword, match_state<BidiIter> &state)
- {
- if((state.flags_.match_not_bow_ && state.bos()) || (state.flags_.match_not_eow_ && state.eos()))
- {
- return !IsBoundary::value;
- }
- return IsBoundary::value == (prevword != thisword);
- }
- };
- ///////////////////////////////////////////////////////////////////////////////
- // word_begin
- //
- struct word_begin
- {
- template<typename BidiIter>
- static bool eval(bool prevword, bool thisword, match_state<BidiIter> &state)
- {
- if(state.flags_.match_not_bow_ && state.bos())
- {
- return false;
- }
- return !prevword && thisword;
- }
- };
- ///////////////////////////////////////////////////////////////////////////////
- // word_end
- //
- struct word_end
- {
- template<typename BidiIter>
- static bool eval(bool prevword, bool thisword, match_state<BidiIter> &state)
- {
- if(state.flags_.match_not_eow_ && state.eos())
- {
- return false;
- }
- return prevword && !thisword;
- }
- };
- ///////////////////////////////////////////////////////////////////////////////
- // assert_word_matcher
- //
- template<typename Cond, typename Traits>
- struct assert_word_matcher
- : quant_style_assertion
- {
- typedef typename Traits::char_type char_type;
- typedef typename Traits::char_class_type char_class_type;
- assert_word_matcher(Traits const &tr)
- : word_(lookup_classname(tr, "w"))
- {
- BOOST_ASSERT(0 != this->word_);
- }
- assert_word_matcher(char_class_type word)
- : word_(word)
- {}
- bool is_word(Traits const &tr, char_type ch) const
- {
- detail::ignore_unused(tr);
- return tr.isctype(tr.translate(ch), this->word_);
- }
- template<typename BidiIter, typename Next>
- bool match(match_state<BidiIter> &state, Next const &next) const
- {
- BidiIter cur = state.cur_;
- bool const thisword = !state.eos() && this->is_word(traits_cast<Traits>(state), *cur);
- bool const prevword = (!state.bos() || state.flags_.match_prev_avail_)
- && this->is_word(traits_cast<Traits>(state), *--cur);
- return Cond::eval(prevword, thisword, state) && next.match(state);
- }
- char_class_type word() const
- {
- return this->word_;
- }
- private:
- char_class_type word_;
- };
- }}}
- #endif
|