928 lines
38 KiB
C++
928 lines
38 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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/// \file regex_primitives.hpp
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/// Contains the syntax elements for writing static regular expressions.
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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_REGEX_PRIMITIVES_HPP_EAN_10_04_2005
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#define BOOST_XPRESSIVE_REGEX_PRIMITIVES_HPP_EAN_10_04_2005
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#include <vector>
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#include <climits>
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#include <boost/config.hpp>
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#include <boost/assert.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/xpressive/detail/detail_fwd.hpp>
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#include <boost/xpressive/detail/core/matchers.hpp>
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#include <boost/xpressive/detail/core/regex_domain.hpp>
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#include <boost/xpressive/detail/utility/ignore_unused.hpp>
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// Doxygen can't handle proto :-(
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#ifndef BOOST_XPRESSIVE_DOXYGEN_INVOKED
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# include <boost/proto/core.hpp>
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# include <boost/proto/transform/arg.hpp>
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# include <boost/proto/transform/when.hpp>
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# include <boost/xpressive/detail/core/icase.hpp>
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# include <boost/xpressive/detail/static/compile.hpp>
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# include <boost/xpressive/detail/static/modifier.hpp>
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#endif
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namespace boost { namespace xpressive { namespace detail
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{
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typedef assert_word_placeholder<word_boundary<mpl::true_> > assert_word_boundary;
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typedef assert_word_placeholder<word_begin> assert_word_begin;
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typedef assert_word_placeholder<word_end> assert_word_end;
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// workaround msvc-7.1 bug with function pointer types
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// within function types:
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#if BOOST_WORKAROUND(BOOST_MSVC, == 1310)
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#define mark_number(x) proto::call<mark_number(x)>
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#define minus_one() proto::make<minus_one()>
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#endif
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struct push_back : proto::callable
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{
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typedef int result_type;
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template<typename Subs>
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int operator ()(Subs &subs, int i) const
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{
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subs.push_back(i);
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return i;
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}
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};
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struct mark_number : proto::callable
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{
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typedef int result_type;
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template<typename Expr>
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int operator ()(Expr const &expr) const
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{
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return expr.mark_number_;
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}
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};
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typedef mpl::int_<-1> minus_one;
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// s1 or -s1
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struct SubMatch
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: proto::or_<
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proto::when<basic_mark_tag, push_back(proto::_data, mark_number(proto::_value)) >
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, proto::when<proto::negate<basic_mark_tag>, push_back(proto::_data, minus_one()) >
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>
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{};
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struct SubMatchList
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: proto::or_<SubMatch, proto::comma<SubMatchList, SubMatch> >
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{};
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template<typename Subs>
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typename enable_if<
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mpl::and_<proto::is_expr<Subs>, proto::matches<Subs, SubMatchList> >
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, std::vector<int>
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>::type
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to_vector(Subs const &subs)
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{
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std::vector<int> subs_;
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SubMatchList()(subs, 0, subs_);
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return subs_;
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}
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#if BOOST_WORKAROUND(BOOST_MSVC, == 1310)
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#undef mark_number
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#undef minus_one
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#endif
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// replace "Expr" with "keep(*State) >> Expr"
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struct skip_primitives : proto::transform<skip_primitives>
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{
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template<typename Expr, typename State, typename Data>
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struct impl : proto::transform_impl<Expr, State, Data>
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{
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typedef
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typename proto::shift_right<
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typename proto::unary_expr<
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keeper_tag
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, typename proto::dereference<State>::type
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>::type
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, Expr
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>::type
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result_type;
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result_type operator ()(
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typename impl::expr_param expr
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, typename impl::state_param state
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, typename impl::data_param
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) const
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{
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result_type that = {{{state}}, expr};
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return that;
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}
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};
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};
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struct Primitives
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: proto::or_<
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proto::terminal<proto::_>
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, proto::comma<proto::_, proto::_>
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, proto::subscript<proto::terminal<set_initializer>, proto::_>
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, proto::assign<proto::terminal<set_initializer>, proto::_>
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, proto::assign<proto::terminal<attribute_placeholder<proto::_> >, proto::_>
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, proto::complement<Primitives>
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>
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{};
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struct SkipGrammar
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: proto::or_<
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proto::when<Primitives, skip_primitives>
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, proto::assign<proto::terminal<mark_placeholder>, SkipGrammar> // don't "skip" mark tags
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, proto::subscript<SkipGrammar, proto::_> // don't put skips in actions
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, proto::binary_expr<modifier_tag, proto::_, SkipGrammar> // don't skip modifiers
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, proto::unary_expr<lookbehind_tag, proto::_> // don't skip lookbehinds
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, proto::nary_expr<proto::_, proto::vararg<SkipGrammar> > // everything else is fair game!
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>
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{};
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template<typename Skip>
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struct skip_directive
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{
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typedef typename proto::result_of::as_expr<Skip>::type skip_type;
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skip_directive(Skip const &skip)
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: skip_(proto::as_expr(skip))
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{}
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template<typename Sig>
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struct result {};
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template<typename This, typename Expr>
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struct result<This(Expr)>
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{
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typedef
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SkipGrammar::impl<
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typename proto::result_of::as_expr<Expr>::type
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, skip_type const &
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, mpl::void_ &
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>
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skip_transform;
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typedef
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typename proto::shift_right<
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typename skip_transform::result_type
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, typename proto::dereference<skip_type>::type
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>::type
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type;
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};
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template<typename Expr>
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typename result<skip_directive(Expr)>::type
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operator ()(Expr const &expr) const
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{
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mpl::void_ ignore;
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typedef result<skip_directive(Expr)> result_fun;
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typename result_fun::type that = {
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typename result_fun::skip_transform()(proto::as_expr(expr), this->skip_, ignore)
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, {skip_}
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};
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return that;
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}
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private:
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skip_type skip_;
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};
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/*
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///////////////////////////////////////////////////////////////////////////////
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/// INTERNAL ONLY
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// BOOST_XPRESSIVE_GLOBAL
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// for defining globals that neither violate the One Definition Rule nor
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// lead to undefined behavior due to global object initialization order.
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//#define BOOST_XPRESSIVE_GLOBAL(type, name, init) \
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// namespace detail \
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// { \
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// template<int Dummy> \
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// struct BOOST_PP_CAT(global_pod_, name) \
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// { \
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// static type const value; \
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// private: \
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// union type_must_be_pod \
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// { \
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// type t; \
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// char ch; \
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// } u; \
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// }; \
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// template<int Dummy> \
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// type const BOOST_PP_CAT(global_pod_, name)<Dummy>::value = init; \
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// } \
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// type const &name = detail::BOOST_PP_CAT(global_pod_, name)<0>::value
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*/
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} // namespace detail
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/// INTERNAL ONLY (for backwards compatibility)
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unsigned int const repeat_max = UINT_MAX-1;
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///////////////////////////////////////////////////////////////////////////////
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/// \brief For infinite repetition of a sub-expression.
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///
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/// Magic value used with the repeat\<\>() function template
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/// to specify an unbounded repeat. Use as: repeat<17, inf>('a').
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/// The equivalent in perl is /a{17,}/.
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unsigned int const inf = UINT_MAX-1;
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/// INTERNAL ONLY (for backwards compatibility)
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proto::terminal<detail::epsilon_matcher>::type const epsilon = {{}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Successfully matches nothing.
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///
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/// Successfully matches a zero-width sequence. nil always succeeds and
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/// never consumes any characters.
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proto::terminal<detail::epsilon_matcher>::type const nil = {{}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches an alpha-numeric character.
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///
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/// The regex traits are used to determine which characters are alpha-numeric.
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/// To match any character that is not alpha-numeric, use ~alnum.
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///
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/// \attention alnum is equivalent to /[[:alnum:]]/ in perl. ~alnum is equivalent
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/// to /[[:^alnum:]]/ in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const alnum = {{"alnum", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches an alphabetic character.
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///
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/// The regex traits are used to determine which characters are alphabetic.
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/// To match any character that is not alphabetic, use ~alpha.
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///
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/// \attention alpha is equivalent to /[[:alpha:]]/ in perl. ~alpha is equivalent
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/// to /[[:^alpha:]]/ in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const alpha = {{"alpha", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a blank (horizonal white-space) character.
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///
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/// The regex traits are used to determine which characters are blank characters.
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/// To match any character that is not blank, use ~blank.
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///
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/// \attention blank is equivalent to /[[:blank:]]/ in perl. ~blank is equivalent
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/// to /[[:^blank:]]/ in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const blank = {{"blank", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a control character.
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///
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/// The regex traits are used to determine which characters are control characters.
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/// To match any character that is not a control character, use ~cntrl.
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///
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/// \attention cntrl is equivalent to /[[:cntrl:]]/ in perl. ~cntrl is equivalent
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/// to /[[:^cntrl:]]/ in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const cntrl = {{"cntrl", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a digit character.
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///
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/// The regex traits are used to determine which characters are digits.
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/// To match any character that is not a digit, use ~digit.
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///
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/// \attention digit is equivalent to /[[:digit:]]/ in perl. ~digit is equivalent
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/// to /[[:^digit:]]/ in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const digit = {{"digit", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a graph character.
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///
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/// The regex traits are used to determine which characters are graphable.
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/// To match any character that is not graphable, use ~graph.
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///
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/// \attention graph is equivalent to /[[:graph:]]/ in perl. ~graph is equivalent
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/// to /[[:^graph:]]/ in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const graph = {{"graph", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a lower-case character.
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///
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/// The regex traits are used to determine which characters are lower-case.
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/// To match any character that is not a lower-case character, use ~lower.
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///
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/// \attention lower is equivalent to /[[:lower:]]/ in perl. ~lower is equivalent
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/// to /[[:^lower:]]/ in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const lower = {{"lower", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a printable character.
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///
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/// The regex traits are used to determine which characters are printable.
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/// To match any character that is not printable, use ~print.
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///
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/// \attention print is equivalent to /[[:print:]]/ in perl. ~print is equivalent
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/// to /[[:^print:]]/ in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const print = {{"print", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a punctuation character.
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///
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/// The regex traits are used to determine which characters are punctuation.
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/// To match any character that is not punctuation, use ~punct.
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///
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/// \attention punct is equivalent to /[[:punct:]]/ in perl. ~punct is equivalent
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/// to /[[:^punct:]]/ in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const punct = {{"punct", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a space character.
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///
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/// The regex traits are used to determine which characters are space characters.
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/// To match any character that is not white-space, use ~space.
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///
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/// \attention space is equivalent to /[[:space:]]/ in perl. ~space is equivalent
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/// to /[[:^space:]]/ in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const space = {{"space", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches an upper-case character.
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///
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/// The regex traits are used to determine which characters are upper-case.
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/// To match any character that is not upper-case, use ~upper.
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///
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/// \attention upper is equivalent to /[[:upper:]]/ in perl. ~upper is equivalent
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/// to /[[:^upper:]]/ in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const upper = {{"upper", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a hexadecimal digit character.
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///
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/// The regex traits are used to determine which characters are hex digits.
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/// To match any character that is not a hex digit, use ~xdigit.
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///
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/// \attention xdigit is equivalent to /[[:xdigit:]]/ in perl. ~xdigit is equivalent
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/// to /[[:^xdigit:]]/ in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const xdigit = {{"xdigit", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Beginning of sequence assertion.
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///
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/// For the character sequence [begin, end), 'bos' matches the
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/// zero-width sub-sequence [begin, begin).
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proto::terminal<detail::assert_bos_matcher>::type const bos = {{}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief End of sequence assertion.
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///
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/// For the character sequence [begin, end),
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/// 'eos' matches the zero-width sub-sequence [end, end).
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///
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/// \attention Unlike the perl end of sequence assertion \$, 'eos' will
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/// not match at the position [end-1, end-1) if *(end-1) is '\\n'. To
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/// get that behavior, use (!_n >> eos).
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proto::terminal<detail::assert_eos_matcher>::type const eos = {{}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Beginning of line assertion.
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///
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/// 'bol' matches the zero-width sub-sequence
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/// immediately following a logical newline sequence. The regex traits
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/// is used to determine what constitutes a logical newline sequence.
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proto::terminal<detail::assert_bol_placeholder>::type const bol = {{}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief End of line assertion.
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///
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/// 'eol' matches the zero-width sub-sequence
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/// immediately preceeding a logical newline sequence. The regex traits
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/// is used to determine what constitutes a logical newline sequence.
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proto::terminal<detail::assert_eol_placeholder>::type const eol = {{}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Beginning of word assertion.
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///
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/// 'bow' matches the zero-width sub-sequence
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/// immediately following a non-word character and preceeding a word character.
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/// The regex traits are used to determine what constitutes a word character.
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proto::terminal<detail::assert_word_begin>::type const bow = {{}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief End of word assertion.
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///
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/// 'eow' matches the zero-width sub-sequence
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/// immediately following a word character and preceeding a non-word character.
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/// The regex traits are used to determine what constitutes a word character.
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proto::terminal<detail::assert_word_end>::type const eow = {{}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Word boundary assertion.
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///
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/// '_b' matches the zero-width sub-sequence at the beginning or the end of a word.
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/// It is equivalent to (bow | eow). The regex traits are used to determine what
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/// constitutes a word character. To match a non-word boundary, use ~_b.
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///
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/// \attention _b is like \\b in perl. ~_b is like \\B in perl.
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proto::terminal<detail::assert_word_boundary>::type const _b = {{}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a word character.
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///
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/// '_w' matches a single word character. The regex traits are used to determine which
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/// characters are word characters. Use ~_w to match a character that is not a word
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/// character.
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///
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/// \attention _w is like \\w in perl. ~_w is like \\W in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const _w = {{"w", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a digit character.
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///
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/// '_d' matches a single digit character. The regex traits are used to determine which
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/// characters are digits. Use ~_d to match a character that is not a digit
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/// character.
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///
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/// \attention _d is like \\d in perl. ~_d is like \\D in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const _d = {{"d", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a space character.
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///
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/// '_s' matches a single space character. The regex traits are used to determine which
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/// characters are space characters. Use ~_s to match a character that is not a space
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/// character.
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///
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/// \attention _s is like \\s in perl. ~_s is like \\S in perl.
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proto::terminal<detail::posix_charset_placeholder>::type const _s = {{"s", false}};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a literal newline character, '\\n'.
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///
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/// '_n' matches a single newline character, '\\n'. Use ~_n to match a character
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/// that is not a newline.
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///
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/// \attention ~_n is like '.' in perl without the /s modifier.
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proto::terminal<char>::type const _n = {'\n'};
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches a logical newline sequence.
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///
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/// '_ln' matches a logical newline sequence. This can be any character in the
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/// line separator class, as determined by the regex traits, or the '\\r\\n' sequence.
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/// For the purpose of back-tracking, '\\r\\n' is treated as a unit.
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/// To match any one character that is not a logical newline, use ~_ln.
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detail::logical_newline_xpression const _ln = {{}};
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|
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Matches any one character.
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///
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/// Match any character, similar to '.' in perl syntax with the /s modifier.
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/// '_' matches any one character, including the newline.
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///
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/// \attention To match any character except the newline, use ~_n
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proto::terminal<detail::any_matcher>::type const _ = {{}};
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|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Reference to the current regex object
|
|
///
|
|
/// Useful when constructing recursive regular expression objects. The 'self'
|
|
/// identifier is a short-hand for the current regex object. For instance,
|
|
/// sregex rx = '(' >> (self | nil) >> ')'; will create a regex object that
|
|
/// matches balanced parens such as "((()))".
|
|
proto::terminal<detail::self_placeholder>::type const self = {{}};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Used to create character sets.
|
|
///
|
|
/// There are two ways to create character sets with the 'set' identifier. The
|
|
/// easiest is to create a comma-separated list of the characters in the set,
|
|
/// as in (set= 'a','b','c'). This set will match 'a', 'b', or 'c'. The other
|
|
/// way is to define the set as an argument to the set subscript operator.
|
|
/// For instance, set[ 'a' | range('b','c') | digit ] will match an 'a', 'b',
|
|
/// 'c' or a digit character.
|
|
///
|
|
/// To complement a set, apply the '~' operator. For instance, ~(set= 'a','b','c')
|
|
/// will match any character that is not an 'a', 'b', or 'c'.
|
|
///
|
|
/// Sets can be composed of other, possibly complemented, sets. For instance,
|
|
/// set[ ~digit | ~(set= 'a','b','c') ].
|
|
detail::set_initializer_type const set = {{}};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Sub-match placeholder type, used to create named captures in
|
|
/// static regexes.
|
|
///
|
|
/// \c mark_tag is the type of the global sub-match placeholders \c s0, \c s1, etc.. You
|
|
/// can use the \c mark_tag type to create your own sub-match placeholders with
|
|
/// more meaningful names. This is roughly equivalent to the "named capture"
|
|
/// feature of dynamic regular expressions.
|
|
///
|
|
/// To create a named sub-match placeholder, initialize it with a unique integer.
|
|
/// The integer must only be unique within the regex in which the placeholder
|
|
/// is used. Then you can use it within static regexes to created sub-matches
|
|
/// by assigning a sub-expression to it, or to refer back to already created
|
|
/// sub-matches.
|
|
///
|
|
/// \code
|
|
/// mark_tag number(1); // "number" is now equivalent to "s1"
|
|
/// // Match a number, followed by a space and the same number again
|
|
/// sregex rx = (number = +_d) >> ' ' >> number;
|
|
/// \endcode
|
|
///
|
|
/// After a successful \c regex_match() or \c regex_search(), the sub-match placeholder
|
|
/// can be used to index into the <tt>match_results\<\></tt> object to retrieve the
|
|
/// corresponding sub-match.
|
|
struct mark_tag
|
|
: proto::extends<detail::basic_mark_tag, mark_tag, detail::regex_domain>
|
|
{
|
|
private:
|
|
typedef proto::extends<detail::basic_mark_tag, mark_tag, detail::regex_domain> base_type;
|
|
|
|
static detail::basic_mark_tag make_tag(int mark_nbr)
|
|
{
|
|
detail::basic_mark_tag mark = {{mark_nbr}};
|
|
return mark;
|
|
}
|
|
|
|
public:
|
|
/// \brief Initialize a mark_tag placeholder
|
|
/// \param mark_nbr An integer that uniquely identifies this \c mark_tag
|
|
/// within the static regexes in which this \c mark_tag will be used.
|
|
/// \pre <tt>mark_nbr \> 0</tt>
|
|
mark_tag(int mark_nbr)
|
|
: base_type(mark_tag::make_tag(mark_nbr))
|
|
{
|
|
// Marks numbers must be integers greater than 0.
|
|
BOOST_ASSERT(mark_nbr > 0);
|
|
}
|
|
|
|
/// INTERNAL ONLY
|
|
operator detail::basic_mark_tag const &() const
|
|
{
|
|
return this->proto_base();
|
|
}
|
|
|
|
BOOST_PROTO_EXTENDS_USING_ASSIGN_NON_DEPENDENT(mark_tag)
|
|
};
|
|
|
|
// This macro is used when declaring mark_tags that are global because
|
|
// it guarantees that they are statically initialized. That avoids
|
|
// order-of-initialization bugs. In user code, the simpler: mark_tag s0(0);
|
|
// would be preferable.
|
|
/// INTERNAL ONLY
|
|
#define BOOST_XPRESSIVE_GLOBAL_MARK_TAG(NAME, VALUE) \
|
|
boost::xpressive::mark_tag::proto_base_expr const NAME = {{VALUE}} \
|
|
/**/
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Sub-match placeholder, like $& in Perl
|
|
BOOST_XPRESSIVE_GLOBAL_MARK_TAG(s0, 0);
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Sub-match placeholder, like $1 in perl.
|
|
///
|
|
/// To create a sub-match, assign a sub-expression to the sub-match placeholder.
|
|
/// For instance, (s1= _) will match any one character and remember which
|
|
/// character was matched in the 1st sub-match. Later in the pattern, you can
|
|
/// refer back to the sub-match. For instance, (s1= _) >> s1 will match any
|
|
/// character, and then match the same character again.
|
|
///
|
|
/// After a successful regex_match() or regex_search(), the sub-match placeholders
|
|
/// can be used to index into the match_results\<\> object to retrieve the Nth
|
|
/// sub-match.
|
|
BOOST_XPRESSIVE_GLOBAL_MARK_TAG(s1, 1);
|
|
BOOST_XPRESSIVE_GLOBAL_MARK_TAG(s2, 2);
|
|
BOOST_XPRESSIVE_GLOBAL_MARK_TAG(s3, 3);
|
|
BOOST_XPRESSIVE_GLOBAL_MARK_TAG(s4, 4);
|
|
BOOST_XPRESSIVE_GLOBAL_MARK_TAG(s5, 5);
|
|
BOOST_XPRESSIVE_GLOBAL_MARK_TAG(s6, 6);
|
|
BOOST_XPRESSIVE_GLOBAL_MARK_TAG(s7, 7);
|
|
BOOST_XPRESSIVE_GLOBAL_MARK_TAG(s8, 8);
|
|
BOOST_XPRESSIVE_GLOBAL_MARK_TAG(s9, 9);
|
|
|
|
// NOTE: For the purpose of xpressive's documentation, make icase() look like an
|
|
// ordinary function. In reality, it is a function object defined in detail/icase.hpp
|
|
// so that it can serve double-duty as regex_constants::icase, the syntax_option_type.
|
|
#ifdef BOOST_XPRESSIVE_DOXYGEN_INVOKED
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Makes a sub-expression case-insensitive.
|
|
///
|
|
/// Use icase() to make a sub-expression case-insensitive. For instance,
|
|
/// "foo" >> icase(set['b'] >> "ar") will match "foo" exactly followed by
|
|
/// "bar" irrespective of case.
|
|
template<typename Expr> detail::unspecified icase(Expr const &expr) { return 0; }
|
|
#endif
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Makes a literal into a regular expression.
|
|
///
|
|
/// Use as_xpr() to turn a literal into a regular expression. For instance,
|
|
/// "foo" >> "bar" will not compile because both operands to the right-shift
|
|
/// operator are const char*, and no such operator exists. Use as_xpr("foo") >> "bar"
|
|
/// instead.
|
|
///
|
|
/// You can use as_xpr() with character literals in addition to string literals.
|
|
/// For instance, as_xpr('a') will match an 'a'. You can also complement a
|
|
/// character literal, as with ~as_xpr('a'). This will match any one character
|
|
/// that is not an 'a'.
|
|
#ifdef BOOST_XPRESSIVE_DOXYGEN_INVOKED
|
|
template<typename Literal> detail::unspecified as_xpr(Literal const &literal) { return 0; }
|
|
#else
|
|
proto::functional::as_expr<> const as_xpr = {};
|
|
#endif
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Embed a regex object by reference.
|
|
///
|
|
/// \param rex The basic_regex object to embed by reference.
|
|
template<typename BidiIter>
|
|
inline typename proto::terminal<reference_wrapper<basic_regex<BidiIter> const> >::type const
|
|
by_ref(basic_regex<BidiIter> const &rex)
|
|
{
|
|
reference_wrapper<basic_regex<BidiIter> const> ref(rex);
|
|
return proto::terminal<reference_wrapper<basic_regex<BidiIter> const> >::type::make(ref);
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Match a range of characters.
|
|
///
|
|
/// Match any character in the range [ch_min, ch_max].
|
|
///
|
|
/// \param ch_min The lower end of the range to match.
|
|
/// \param ch_max The upper end of the range to match.
|
|
template<typename Char>
|
|
inline typename proto::terminal<detail::range_placeholder<Char> >::type const
|
|
range(Char ch_min, Char ch_max)
|
|
{
|
|
detail::range_placeholder<Char> that = {ch_min, ch_max, false};
|
|
return proto::terminal<detail::range_placeholder<Char> >::type::make(that);
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Make a sub-expression optional. Equivalent to !as_xpr(expr).
|
|
///
|
|
/// \param expr The sub-expression to make optional.
|
|
template<typename Expr>
|
|
typename proto::result_of::make_expr<
|
|
proto::tag::logical_not
|
|
, proto::default_domain
|
|
, Expr const &
|
|
>::type const
|
|
optional(Expr const &expr)
|
|
{
|
|
return proto::make_expr<
|
|
proto::tag::logical_not
|
|
, proto::default_domain
|
|
>(boost::ref(expr));
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Repeat a sub-expression multiple times.
|
|
///
|
|
/// There are two forms of the repeat\<\>() function template. To match a
|
|
/// sub-expression N times, use repeat\<N\>(expr). To match a sub-expression
|
|
/// from M to N times, use repeat\<M,N\>(expr).
|
|
///
|
|
/// The repeat\<\>() function creates a greedy quantifier. To make the quantifier
|
|
/// non-greedy, apply the unary minus operator, as in -repeat\<M,N\>(expr).
|
|
///
|
|
/// \param expr The sub-expression to repeat.
|
|
template<unsigned int Min, unsigned int Max, typename Expr>
|
|
typename proto::result_of::make_expr<
|
|
detail::generic_quant_tag<Min, Max>
|
|
, proto::default_domain
|
|
, Expr const &
|
|
>::type const
|
|
repeat(Expr const &expr)
|
|
{
|
|
return proto::make_expr<
|
|
detail::generic_quant_tag<Min, Max>
|
|
, proto::default_domain
|
|
>(boost::ref(expr));
|
|
}
|
|
|
|
/// \overload
|
|
///
|
|
template<unsigned int Count, typename Expr2>
|
|
typename proto::result_of::make_expr<
|
|
detail::generic_quant_tag<Count, Count>
|
|
, proto::default_domain
|
|
, Expr2 const &
|
|
>::type const
|
|
repeat(Expr2 const &expr2)
|
|
{
|
|
return proto::make_expr<
|
|
detail::generic_quant_tag<Count, Count>
|
|
, proto::default_domain
|
|
>(boost::ref(expr2));
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Create an independent sub-expression.
|
|
///
|
|
/// Turn off back-tracking for a sub-expression. Any branches or repeats within
|
|
/// the sub-expression will match only one way, and no other alternatives are
|
|
/// tried.
|
|
///
|
|
/// \attention keep(expr) is equivalent to the perl (?>...) extension.
|
|
///
|
|
/// \param expr The sub-expression to modify.
|
|
template<typename Expr>
|
|
typename proto::result_of::make_expr<
|
|
detail::keeper_tag
|
|
, proto::default_domain
|
|
, Expr const &
|
|
>::type const
|
|
keep(Expr const &expr)
|
|
{
|
|
return proto::make_expr<
|
|
detail::keeper_tag
|
|
, proto::default_domain
|
|
>(boost::ref(expr));
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Look-ahead assertion.
|
|
///
|
|
/// before(expr) succeeds if the expr sub-expression would match at the current
|
|
/// position in the sequence, but expr is not included in the match. For instance,
|
|
/// before("foo") succeeds if we are before a "foo". Look-ahead assertions can be
|
|
/// negated with the bit-compliment operator.
|
|
///
|
|
/// \attention before(expr) is equivalent to the perl (?=...) extension.
|
|
/// ~before(expr) is a negative look-ahead assertion, equivalent to the
|
|
/// perl (?!...) extension.
|
|
///
|
|
/// \param expr The sub-expression to put in the look-ahead assertion.
|
|
template<typename Expr>
|
|
typename proto::result_of::make_expr<
|
|
detail::lookahead_tag
|
|
, proto::default_domain
|
|
, Expr const &
|
|
>::type const
|
|
before(Expr const &expr)
|
|
{
|
|
return proto::make_expr<
|
|
detail::lookahead_tag
|
|
, proto::default_domain
|
|
>(boost::ref(expr));
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Look-behind assertion.
|
|
///
|
|
/// after(expr) succeeds if the expr sub-expression would match at the current
|
|
/// position minus N in the sequence, where N is the width of expr. expr is not included in
|
|
/// the match. For instance, after("foo") succeeds if we are after a "foo". Look-behind
|
|
/// assertions can be negated with the bit-complement operator.
|
|
///
|
|
/// \attention after(expr) is equivalent to the perl (?<=...) extension.
|
|
/// ~after(expr) is a negative look-behind assertion, equivalent to the
|
|
/// perl (?<!...) extension.
|
|
///
|
|
/// \param expr The sub-expression to put in the look-ahead assertion.
|
|
///
|
|
/// \pre expr cannot match a variable number of characters.
|
|
template<typename Expr>
|
|
typename proto::result_of::make_expr<
|
|
detail::lookbehind_tag
|
|
, proto::default_domain
|
|
, Expr const &
|
|
>::type const
|
|
after(Expr const &expr)
|
|
{
|
|
return proto::make_expr<
|
|
detail::lookbehind_tag
|
|
, proto::default_domain
|
|
>(boost::ref(expr));
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Specify a regex traits or a std::locale.
|
|
///
|
|
/// imbue() instructs the regex engine to use the specified traits or locale
|
|
/// when matching the regex. The entire expression must use the same traits/locale.
|
|
/// For instance, the following specifies a locale for use with a regex:
|
|
/// std::locale loc;
|
|
/// sregex rx = imbue(loc)(+digit);
|
|
///
|
|
/// \param loc The std::locale or regex traits object.
|
|
template<typename Locale>
|
|
inline detail::modifier_op<detail::locale_modifier<Locale> > const
|
|
imbue(Locale const &loc)
|
|
{
|
|
detail::modifier_op<detail::locale_modifier<Locale> > mod =
|
|
{
|
|
detail::locale_modifier<Locale>(loc)
|
|
, regex_constants::ECMAScript
|
|
};
|
|
return mod;
|
|
}
|
|
|
|
proto::terminal<detail::attribute_placeholder<mpl::int_<1> > >::type const a1 = {{}};
|
|
proto::terminal<detail::attribute_placeholder<mpl::int_<2> > >::type const a2 = {{}};
|
|
proto::terminal<detail::attribute_placeholder<mpl::int_<3> > >::type const a3 = {{}};
|
|
proto::terminal<detail::attribute_placeholder<mpl::int_<4> > >::type const a4 = {{}};
|
|
proto::terminal<detail::attribute_placeholder<mpl::int_<5> > >::type const a5 = {{}};
|
|
proto::terminal<detail::attribute_placeholder<mpl::int_<6> > >::type const a6 = {{}};
|
|
proto::terminal<detail::attribute_placeholder<mpl::int_<7> > >::type const a7 = {{}};
|
|
proto::terminal<detail::attribute_placeholder<mpl::int_<8> > >::type const a8 = {{}};
|
|
proto::terminal<detail::attribute_placeholder<mpl::int_<9> > >::type const a9 = {{}};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
/// \brief Specify which characters to skip when matching a regex.
|
|
///
|
|
/// <tt>skip()</tt> instructs the regex engine to skip certain characters when matching
|
|
/// a regex. It is most useful for writing regexes that ignore whitespace.
|
|
/// For instance, the following specifies a regex that skips whitespace and
|
|
/// punctuation:
|
|
///
|
|
/// \code
|
|
/// // A sentence is one or more words separated by whitespace
|
|
/// // and punctuation.
|
|
/// sregex word = +alpha;
|
|
/// sregex sentence = skip(set[_s | punct])( +word );
|
|
/// \endcode
|
|
///
|
|
/// The way it works in the above example is to insert
|
|
/// <tt>keep(*set[_s | punct])</tt> before each primitive within the regex.
|
|
/// A "primitive" includes terminals like strings, character sets and nested
|
|
/// regexes. A final <tt>*set[_s | punct]</tt> is added to the end of the
|
|
/// regex. The regex <tt>sentence</tt> specified above is equivalent to
|
|
/// the following:
|
|
///
|
|
/// \code
|
|
/// sregex sentence = +( keep(*set[_s | punct]) >> word )
|
|
/// >> *set[_s | punct];
|
|
/// \endcode
|
|
///
|
|
/// \attention Skipping does not affect how nested regexes are handled because
|
|
/// they are treated atomically. String literals are also treated
|
|
/// atomically; that is, no skipping is done within a string literal. So
|
|
/// <tt>skip(_s)("this that")</tt> is not the same as
|
|
/// <tt>skip(_s)("this" >> as_xpr("that"))</tt>. The first will only match
|
|
/// when there is only one space between "this" and "that". The second will
|
|
/// skip any and all whitespace between "this" and "that".
|
|
///
|
|
/// \param skip A regex that specifies which characters to skip.
|
|
template<typename Skip>
|
|
detail::skip_directive<Skip> skip(Skip const &skip)
|
|
{
|
|
return detail::skip_directive<Skip>(skip);
|
|
}
|
|
|
|
namespace detail
|
|
{
|
|
inline void ignore_unused_regex_primitives()
|
|
{
|
|
detail::ignore_unused(repeat_max);
|
|
detail::ignore_unused(inf);
|
|
detail::ignore_unused(epsilon);
|
|
detail::ignore_unused(nil);
|
|
detail::ignore_unused(alnum);
|
|
detail::ignore_unused(bos);
|
|
detail::ignore_unused(eos);
|
|
detail::ignore_unused(bol);
|
|
detail::ignore_unused(eol);
|
|
detail::ignore_unused(bow);
|
|
detail::ignore_unused(eow);
|
|
detail::ignore_unused(_b);
|
|
detail::ignore_unused(_w);
|
|
detail::ignore_unused(_d);
|
|
detail::ignore_unused(_s);
|
|
detail::ignore_unused(_n);
|
|
detail::ignore_unused(_ln);
|
|
detail::ignore_unused(_);
|
|
detail::ignore_unused(self);
|
|
detail::ignore_unused(set);
|
|
detail::ignore_unused(s0);
|
|
detail::ignore_unused(s1);
|
|
detail::ignore_unused(s2);
|
|
detail::ignore_unused(s3);
|
|
detail::ignore_unused(s4);
|
|
detail::ignore_unused(s5);
|
|
detail::ignore_unused(s6);
|
|
detail::ignore_unused(s7);
|
|
detail::ignore_unused(s8);
|
|
detail::ignore_unused(s9);
|
|
detail::ignore_unused(a1);
|
|
detail::ignore_unused(a2);
|
|
detail::ignore_unused(a3);
|
|
detail::ignore_unused(a4);
|
|
detail::ignore_unused(a5);
|
|
detail::ignore_unused(a6);
|
|
detail::ignore_unused(a7);
|
|
detail::ignore_unused(a8);
|
|
detail::ignore_unused(a9);
|
|
detail::ignore_unused(as_xpr);
|
|
}
|
|
}
|
|
|
|
}} // namespace boost::xpressive
|
|
|
|
#endif
|