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130 lines
4.3 KiB
130 lines
4.3 KiB
///////////////////////////////////////////////////////////////////////////////
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// quant_style.hpp
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_XPRESSIVE_DETAIL_CORE_QUANT_STYLE_HPP_EAN_10_04_2005
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#define BOOST_XPRESSIVE_DETAIL_CORE_QUANT_STYLE_HPP_EAN_10_04_2005
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/config.hpp>
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#include <boost/mpl/has_xxx.hpp>
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#include <boost/xpressive/detail/utility/width.hpp>
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#include <boost/xpressive/detail/detail_fwd.hpp>
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namespace boost { namespace xpressive { namespace detail
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{
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BOOST_MPL_HAS_XXX_TRAIT_DEF(is_boost_xpressive_xpression_)
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///////////////////////////////////////////////////////////////////////////////
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// is_xpr
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//
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template<typename Xpr>
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struct is_xpr
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: has_is_boost_xpressive_xpression_<Xpr>
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{};
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///////////////////////////////////////////////////////////////////////////////
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// quant_enum
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//
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enum quant_enum
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{
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quant_none,
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quant_fixed_width,
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quant_variable_width
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};
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///////////////////////////////////////////////////////////////////////////////
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// quant_style
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//
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template<quant_enum QuantStyle, std::size_t Width = unknown_width::value, bool Pure = true>
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struct quant_style
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{
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typedef void is_boost_xpressive_xpression_;
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// Which quantification strategy to use?
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BOOST_STATIC_CONSTANT(int, quant = QuantStyle);
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// how many characters this matcher consumes
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BOOST_STATIC_CONSTANT(std::size_t, width = Width);
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// whether this matcher has observable side-effects
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BOOST_STATIC_CONSTANT(bool, pure = Pure);
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static detail::width get_width()
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{
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return width;
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}
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};
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#define BOOST_XPR_QUANT_STYLE(Style, Width, Pure) \
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typedef void is_boost_xpressive_xpression_; \
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BOOST_STATIC_CONSTANT(int, quant = Style); \
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BOOST_STATIC_CONSTANT(std::size_t, width = Width); \
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BOOST_STATIC_CONSTANT(bool, pure = Pure); \
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static detail::width get_width() { return width; } \
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/**/
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// // Replace transmogrify stupidity with rebindable matchers/placeholders
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//#define BOOST_XPR_IDENTITY_REBIND(TYPE) \/
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// template<typename BidiIter, typename ICase, typename Traits> \/
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// struct rebind \/
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// { \/
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// typedef TYPE type; \/
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// }; \/
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// /**/
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///////////////////////////////////////////////////////////////////////////////
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// quant_style_none
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// this sub-expression cannot be quantified
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typedef quant_style<quant_none> quant_style_none;
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///////////////////////////////////////////////////////////////////////////////
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// quant_style_fixed_unknown_width
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// this sub-expression is fixed width for the purpose of quantification, but
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// the width cannot be determined at compile time. An example would be the
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// string_matcher or the mark_matcher.
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typedef quant_style<quant_fixed_width> quant_style_fixed_unknown_width;
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///////////////////////////////////////////////////////////////////////////////
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// quant_style_variable_width
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// this sub-expression can match a variable number of characters
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typedef quant_style<quant_variable_width> quant_style_variable_width;
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///////////////////////////////////////////////////////////////////////////////
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// quant_style_fixed_width
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// for when the sub-expression has a fixed width that is known at compile time
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template<std::size_t Width>
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struct quant_style_fixed_width
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: quant_style<quant_fixed_width, Width>
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{
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};
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///////////////////////////////////////////////////////////////////////////////
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// quant_style_assertion
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// a zero-width assertion.
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struct quant_style_assertion
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: quant_style<quant_none, 0>
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{
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};
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///////////////////////////////////////////////////////////////////////////////
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// quant_type
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//
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template<typename Matcher>
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struct quant_type
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: mpl::int_<Matcher::quant>
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{
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};
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}}} // namespace boost::xpressive::detail
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#endif
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