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///////////////////////////////////////////////////////////////////////////////
// grammar.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_STATIC_GRAMMAR_HPP_EAN_11_12_2006
#define BOOST_XPRESSIVE_DETAIL_STATIC_GRAMMAR_HPP_EAN_11_12_2006
// MS compatible compilers support #pragma once
#if defined(_MSC_VER)
# pragma once
#endif
#include <boost/mpl/if.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/proto/core.hpp>
#include <boost/xpressive/detail/static/is_pure.hpp>
#include <boost/xpressive/detail/static/transforms/as_matcher.hpp>
#include <boost/xpressive/detail/static/transforms/as_alternate.hpp>
#include <boost/xpressive/detail/static/transforms/as_sequence.hpp>
#include <boost/xpressive/detail/static/transforms/as_quantifier.hpp>
#include <boost/xpressive/detail/static/transforms/as_marker.hpp>
#include <boost/xpressive/detail/static/transforms/as_set.hpp>
#include <boost/xpressive/detail/static/transforms/as_independent.hpp>
#include <boost/xpressive/detail/static/transforms/as_modifier.hpp>
#include <boost/xpressive/detail/static/transforms/as_inverse.hpp>
#include <boost/xpressive/detail/static/transforms/as_action.hpp>
#include <boost/xpressive/detail/detail_fwd.hpp>
#define BOOST_XPRESSIVE_CHECK_REGEX(Expr, Char)\
BOOST_MPL_ASSERT\
((\
typename boost::mpl::if_c<\
boost::xpressive::is_valid_regex<Expr, Char>::value\
, boost::mpl::true_\
, boost::xpressive::INVALID_REGULAR_EXPRESSION\
>::type\
));
//////////////////////////////////////////////////////////////////////////
//**********************************************************************//
//* << NOTE! >> *//
//* *//
//* Whenever you change this grammar, you MUST also make corresponding *//
//* changes to width_of.hpp and is_pure.hpp. *//
//* *//
//**********************************************************************//
//////////////////////////////////////////////////////////////////////////
namespace boost { namespace xpressive
{
template<typename Char>
struct Grammar;
template<typename Char>
struct ActionableGrammar;
namespace grammar_detail
{
///////////////////////////////////////////////////////////////////////////
// CharLiteral
template<typename Char>
struct CharLiteral;
///////////////////////////////////////////////////////////////////////////
// ListSet
template<typename Char>
struct ListSet;
///////////////////////////////////////////////////////////////////////////
// as_repeat
template<typename Char, typename Gram, typename Greedy>
struct as_repeat
: if_<
make<detail::use_simple_repeat<_child, Char> >
, as_simple_quantifier<Gram, Greedy>
, as_default_quantifier<Greedy>
>
{};
///////////////////////////////////////////////////////////////////////////
// NonGreedyRepeatCases
template<typename Gram>
struct NonGreedyRepeatCases
{
template<typename Tag, typename Dummy = void>
struct case_
: not_<_>
{};
template<typename Dummy>
struct case_<tag::dereference, Dummy>
: dereference<Gram>
{};
template<typename Dummy>
struct case_<tag::unary_plus, Dummy>
: unary_plus<Gram>
{};
template<typename Dummy>
struct case_<tag::logical_not, Dummy>
: logical_not<Gram>
{};
template<uint_t Min, uint_t Max, typename Dummy>
struct case_<detail::generic_quant_tag<Min, Max>, Dummy>
: unary_expr<detail::generic_quant_tag<Min, Max>, Gram>
{};
};
///////////////////////////////////////////////////////////////////////////
// InvertibleCases
template<typename Char, typename Gram>
struct InvertibleCases
{
template<typename Tag, typename Dummy = void>
struct case_
: not_<_>
{};
template<typename Dummy>
struct case_<tag::comma, Dummy>
: when<ListSet<Char>, as_list_set_matcher<Char> >
{};
template<typename Dummy>
struct case_<tag::assign, Dummy>
: when<ListSet<Char>, as_list_set_matcher<Char> >
{};
template<typename Dummy>
struct case_<tag::subscript, Dummy>
: when<subscript<detail::set_initializer_type, Gram>, call<as_set_matcher<Gram>(_right)> >
{};
template<typename Dummy>
struct case_<detail::lookahead_tag, Dummy>
: when<
unary_expr<detail::lookahead_tag, Gram>
, as_lookahead<Gram>
>
{};
template<typename Dummy>
struct case_<detail::lookbehind_tag, Dummy>
: when<
unary_expr<detail::lookbehind_tag, Gram>
, as_lookbehind<Gram>
>
{};
template<typename Dummy>
struct case_<tag::terminal, Dummy>
: when<
or_<
CharLiteral<Char>
, terminal<detail::posix_charset_placeholder>
, terminal<detail::range_placeholder<_> >
, terminal<detail::logical_newline_placeholder>
, terminal<detail::assert_word_placeholder<detail::word_boundary<mpl::true_> > >
>
, as_matcher
>
{};
};
///////////////////////////////////////////////////////////////////////////
// Cases
template<typename Char, typename Gram>
struct Cases
{
template<typename Tag, typename Dummy = void>
struct case_
: not_<_>
{};
template<typename Dummy>
struct case_<tag::terminal, Dummy>
: when<
_
, in_sequence<as_matcher>
>
{};
template<typename Dummy>
struct case_<tag::shift_right, Dummy>
: when<
shift_right<Gram, Gram>
, reverse_fold<_, _state, Gram>
>
{};
template<typename Dummy>
struct case_<tag::bitwise_or, Dummy>
: when<
bitwise_or<Gram, Gram>
, in_sequence<
as_alternate_matcher<
reverse_fold_tree<_, make<fusion::nil>, in_alternate_list<Gram> >
>
>
>
{};
template<typename Dummy, typename Greedy>
struct case_<optional_tag<Greedy> , Dummy>
: when<
unary_expr<optional_tag<Greedy>, Gram>
, in_sequence<call<as_optional<Gram, Greedy>(_child)> >
>
{};
template<typename Dummy>
struct case_<tag::dereference, Dummy>
: when<
dereference<Gram>
, call<Gram(as_repeat<Char, Gram, mpl::true_>)>
>
{};
template<typename Dummy>
struct case_<tag::unary_plus, Dummy>
: when<
unary_plus<Gram>
, call<Gram(as_repeat<Char, Gram, mpl::true_>)>
>
{};
template<typename Dummy>
struct case_<tag::logical_not, Dummy>
: when<
logical_not<Gram>
, call<Gram(as_repeat<Char, Gram, mpl::true_>)>
>
{};
template<uint_t Min, uint_t Max, typename Dummy>
struct case_<detail::generic_quant_tag<Min, Max>, Dummy>
: when<
unary_expr<detail::generic_quant_tag<Min, Max>, Gram>
, call<Gram(as_repeat<Char, Gram, mpl::true_>)>
>
{};
template<typename Dummy>
struct case_<tag::negate, Dummy>
: when<
negate<switch_<NonGreedyRepeatCases<Gram> > >
, call<Gram(call<as_repeat<Char, Gram, mpl::false_>(_child)>)>
>
{};
template<typename Dummy>
struct case_<tag::complement, Dummy>
: when<
complement<switch_<InvertibleCases<Char, Gram> > >
, in_sequence<call<as_inverse(call<switch_<InvertibleCases<Char, Gram> >(_child)>)> >
>
{};
template<typename Dummy>
struct case_<detail::modifier_tag, Dummy>
: when<binary_expr<detail::modifier_tag, _, Gram>, as_modifier<Gram> >
{};
template<typename Dummy>
struct case_<detail::lookahead_tag, Dummy>
: when<
unary_expr<detail::lookahead_tag, Gram>
, in_sequence<as_lookahead<Gram> >
>
{};
template<typename Dummy>
struct case_<detail::lookbehind_tag, Dummy>
: when<
unary_expr<detail::lookbehind_tag, Gram>
, in_sequence<as_lookbehind<Gram> >
>
{};
template<typename Dummy>
struct case_<detail::keeper_tag, Dummy>
: when<
unary_expr<detail::keeper_tag, Gram>
, in_sequence<as_keeper<Gram> >
>
{};
template<typename Dummy>
struct case_<tag::comma, Dummy>
: when<ListSet<Char>, in_sequence<as_list_set_matcher<Char> > >
{};
template<typename Dummy>
struct case_<tag::assign, Dummy>
: or_<
when<assign<detail::basic_mark_tag, Gram>, call<Gram(as_marker)> >
, when<ListSet<Char>, in_sequence<as_list_set_matcher<Char> > >
>
{};
template<typename Dummy>
struct case_<tag::subscript, Dummy>
: or_<
when<subscript<detail::set_initializer_type, Gram>, in_sequence<call<as_set_matcher<Gram>(_right)> > >
, when<subscript<ActionableGrammar<Char>, _>, call<ActionableGrammar<Char>(as_action)> >
>
{};
};
///////////////////////////////////////////////////////////////////////////
// ActionableCases
template<typename Char, typename Gram>
struct ActionableCases
{
template<typename Tag, typename Dummy = void>
struct case_
: Cases<Char, Gram>::template case_<Tag>
{};
// Only in sub-expressions with actions attached do we allow attribute assignements
template<typename Dummy>
struct case_<proto::tag::assign, Dummy>
: or_<
typename Cases<Char, Gram>::template case_<proto::tag::assign>
, when<proto::assign<terminal<detail::attribute_placeholder<_> >, _>, in_sequence<as_attr_matcher> >
>
{};
};
} // namespace detail
///////////////////////////////////////////////////////////////////////////
// Grammar
template<typename Char>
struct Grammar
: proto::switch_<grammar_detail::Cases<Char, Grammar<Char> > >
{};
template<typename Char>
struct ActionableGrammar
: proto::switch_<grammar_detail::ActionableCases<Char, ActionableGrammar<Char> > >
{};
///////////////////////////////////////////////////////////////////////////
// INVALID_REGULAR_EXPRESSION
struct INVALID_REGULAR_EXPRESSION
: mpl::false_
{};
///////////////////////////////////////////////////////////////////////////
// is_valid_regex
template<typename Expr, typename Char>
struct is_valid_regex
: proto::matches<Expr, Grammar<Char> >
{};
}} // namespace boost::xpressive
#endif
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