You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
3.7 KiB
126 lines
3.7 KiB
///////////////////////////////////////////////////////////////////////////////
|
|
// 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
|