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///////////////////////////////////////////////////////////////////////////////
// chset.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_CHSET_CHSET_HPP_EAN_10_04_2005
#define BOOST_XPRESSIVE_DETAIL_CHSET_CHSET_HPP_EAN_10_04_2005
// MS compatible compilers support #pragma once
#if defined(_MSC_VER)
# pragma once
#endif
#include <vector>
#include <boost/call_traits.hpp>
#include <boost/xpressive/detail/detail_fwd.hpp>
#include <boost/xpressive/detail/utility/algorithm.hpp>
#include <boost/xpressive/detail/utility/chset/basic_chset.ipp>
namespace boost { namespace xpressive { namespace detail
{
///////////////////////////////////////////////////////////////////////////////
// compound_charset
//
template<typename Traits>
struct compound_charset
: private basic_chset<typename Traits::char_type>
{
typedef typename Traits::char_type char_type;
typedef basic_chset<char_type> base_type;
typedef Traits traits_type;
typedef typename Traits::char_class_type char_class_type;
compound_charset()
: base_type()
, complement_(false)
, has_posix_(false)
, posix_yes_()
, posix_no_()
{
}
///////////////////////////////////////////////////////////////////////////////
// accessors
basic_chset<char_type> const &base() const
{
return *this;
}
bool is_inverted() const
{
return this->complement_;
}
char_class_type posix_yes() const
{
return this->posix_yes_;
}
std::vector<char_class_type> const &posix_no() const
{
return this->posix_no_;
}
///////////////////////////////////////////////////////////////////////////////
// complement
void inverse()
{
this->complement_ = !this->complement_;
}
///////////////////////////////////////////////////////////////////////////////
// set
void set_char(char_type ch, Traits const &tr, bool icase)
{
icase ? this->base_type::set(ch, tr) : this->base_type::set(ch);
}
void set_range(char_type from, char_type to, Traits const &tr, bool icase)
{
icase ? this->base_type::set(from, to, tr) : this->base_type::set(from, to);
}
void set_class(char_class_type const &m, bool no)
{
this->has_posix_ = true;
if(no)
{
this->posix_no_.push_back(m);
}
else
{
this->posix_yes_ |= m;
}
}
///////////////////////////////////////////////////////////////////////////////
// test
template<typename ICase>
bool test(char_type ch, Traits const &tr, ICase) const
{
return this->complement_ !=
(this->base_type::test(ch, tr, ICase()) ||
(this->has_posix_ && this->test_posix(ch, tr)));
}
private:
///////////////////////////////////////////////////////////////////////////////
// not_posix_pred
struct not_posix_pred
{
char_type ch_;
Traits const *traits_ptr_;
bool operator ()(typename call_traits<char_class_type>::param_type m) const
{
return !this->traits_ptr_->isctype(this->ch_, m);
}
};
///////////////////////////////////////////////////////////////////////////////
// test_posix
bool test_posix(char_type ch, Traits const &tr) const
{
not_posix_pred const pred = {ch, &tr};
return tr.isctype(ch, this->posix_yes_)
|| any(this->posix_no_.begin(), this->posix_no_.end(), pred);
}
bool complement_;
bool has_posix_;
char_class_type posix_yes_;
std::vector<char_class_type> posix_no_;
};
///////////////////////////////////////////////////////////////////////////////
// helpers
template<typename Char, typename Traits>
inline void set_char(compound_charset<Traits> &chset, Char ch, Traits const &tr, bool icase)
{
chset.set_char(ch, tr, icase);
}
template<typename Char, typename Traits>
inline void set_range(compound_charset<Traits> &chset, Char from, Char to, Traits const &tr, bool icase)
{
chset.set_range(from, to, tr, icase);
}
template<typename Traits>
inline void set_class(compound_charset<Traits> &chset, typename Traits::char_class_type char_class, bool no, Traits const &)
{
chset.set_class(char_class, no);
}
}}} // namespace boost::xpressive::detail
#endif
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