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- // Copyright (c) 2001-2011 Hartmut Kaiser
- //
- // 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)
- #if !defined(BOOST_SPIRIT_LEX_STRING_TOKEN_DEF_MAR_28_2007_0722PM)
- #define BOOST_SPIRIT_LEX_STRING_TOKEN_DEF_MAR_28_2007_0722PM
- #if defined(_MSC_VER)
- #pragma once
- #endif
- #include <boost/spirit/home/support/common_terminals.hpp>
- #include <boost/spirit/home/support/string_traits.hpp>
- #include <boost/spirit/home/lex/domain.hpp>
- #include <boost/spirit/home/lex/lexer_type.hpp>
- #include <boost/spirit/home/lex/meta_compiler.hpp>
- #include <boost/type_traits/add_const.hpp>
- #include <boost/type_traits/add_reference.hpp>
- #include <boost/type_traits/is_integral.hpp>
- #include <boost/type_traits/remove_const.hpp>
- #include <boost/fusion/include/vector.hpp>
- #include <boost/fusion/include/at.hpp>
- namespace boost { namespace spirit
- {
- ///////////////////////////////////////////////////////////////////////////
- // Enablers
- ///////////////////////////////////////////////////////////////////////////
- // enables strings
- template <typename T>
- struct use_terminal<lex::domain, T
- , typename enable_if<traits::is_string<T> >::type>
- : mpl::true_ {};
- // enables string(str)
- template <typename CharEncoding, typename A0>
- struct use_terminal<lex::domain
- , terminal_ex<
- tag::char_code<tag::string, CharEncoding>
- , fusion::vector1<A0> > >
- : traits::is_string<A0> {};
- // enables string(str, ID)
- template <typename CharEncoding, typename A0, typename A1>
- struct use_terminal<lex::domain
- , terminal_ex<
- tag::char_code<tag::string, CharEncoding>
- , fusion::vector2<A0, A1> > >
- : traits::is_string<A0> {};
- }}
- namespace boost { namespace spirit { namespace lex
- {
- // use string from standard character set by default
- #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
- using spirit::standard::string;
- #endif
- using spirit::standard::string_type;
- ///////////////////////////////////////////////////////////////////////////
- //
- // string_token_def
- // represents a string based token definition
- //
- ///////////////////////////////////////////////////////////////////////////
- template <typename String, typename IdType = std::size_t
- , typename CharEncoding = char_encoding::standard>
- struct string_token_def
- : primitive_lexer<string_token_def<String, IdType, CharEncoding> >
- {
- typedef typename
- remove_const<typename traits::char_type_of<String>::type>::type
- char_type;
- typedef std::basic_string<char_type> string_type;
- string_token_def(typename add_reference<String>::type str, IdType const& id)
- : str_(str), id_(id), unique_id_(std::size_t(~0))
- , token_state_(std::size_t(~0))
- {}
- template <typename LexerDef, typename String_>
- void collect(LexerDef& lexdef, String_ const& state
- , String_ const& targetstate) const
- {
- std::size_t state_id = lexdef.add_state(state.c_str());
- // If the following assertion fires you are probably trying to use
- // a single string_token_def instance in more than one lexer state.
- // This is not possible. Please create a separate token_def instance
- // from the same regular expression for each lexer state it needs
- // to be associated with.
- BOOST_ASSERT(
- (std::size_t(~0) == token_state_ || state_id == token_state_) &&
- "Can't use single string_token_def with more than one lexer state");
- char_type const* target = targetstate.empty() ? 0 : targetstate.c_str();
- if (target)
- lexdef.add_state(target);
- token_state_ = state_id;
- if (IdType(~0) == id_)
- id_ = IdType(lexdef.get_next_id());
- unique_id_ = lexdef.add_token (state.c_str(), str_, id_, target);
- }
- template <typename LexerDef>
- void add_actions(LexerDef&) const {}
- std::size_t id() const { return id_; }
- std::size_t unique_id() const { return unique_id_; }
- std::size_t state() const { return token_state_; }
- string_type str_;
- mutable IdType id_;
- mutable std::size_t unique_id_;
- mutable std::size_t token_state_;
- };
- ///////////////////////////////////////////////////////////////////////////
- // Lex generators: make_xxx function (objects)
- ///////////////////////////////////////////////////////////////////////////
- template <typename T, typename Modifiers>
- struct make_primitive<T, Modifiers
- , typename enable_if<traits::is_string<T> >::type>
- {
- typedef typename add_const<T>::type const_string;
- typedef string_token_def<const_string> result_type;
- result_type operator()(
- typename add_reference<const_string>::type str, unused_type) const
- {
- return result_type(str, std::size_t(~0));
- }
- };
- template <typename Modifiers, typename CharEncoding, typename A0>
- struct make_primitive<
- terminal_ex<
- tag::char_code<tag::string, CharEncoding>
- , fusion::vector1<A0> >
- , Modifiers>
- {
- typedef typename add_const<A0>::type const_string;
- typedef string_token_def<const_string, std::size_t, CharEncoding>
- result_type;
- template <typename Terminal>
- result_type operator()(Terminal const& term, unused_type) const
- {
- return result_type(fusion::at_c<0>(term.args), std::size_t(~0));
- }
- };
- template <typename Modifiers, typename CharEncoding, typename A0, typename A1>
- struct make_primitive<
- terminal_ex<
- tag::char_code<tag::string, CharEncoding>
- , fusion::vector2<A0, A1> >
- , Modifiers>
- {
- typedef typename add_const<A0>::type const_string;
- typedef string_token_def<const_string, A1, CharEncoding> result_type;
- template <typename Terminal>
- result_type operator()(Terminal const& term, unused_type) const
- {
- return result_type(
- fusion::at_c<0>(term.args), fusion::at_c<1>(term.args));
- }
- };
- }}} // namespace boost::spirit::lex
- #endif
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