| // 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_TOKEN_DEF_MAR_13_2007_0145PM) | |
| #define BOOST_SPIRIT_LEX_TOKEN_DEF_MAR_13_2007_0145PM | |
| #if defined(_MSC_VER) | |
| #pragma once | |
| #endif | |
| #include <boost/spirit/home/support/unused.hpp> | |
| #include <boost/spirit/home/support/argument.hpp> | |
| #include <boost/spirit/home/support/info.hpp> | |
| #include <boost/spirit/home/support/handles_container.hpp> | |
| #include <boost/spirit/home/qi/parser.hpp> | |
| #include <boost/spirit/home/qi/skip_over.hpp> | |
| #include <boost/spirit/home/qi/detail/construct.hpp> | |
| #include <boost/spirit/home/qi/detail/assign_to.hpp> | |
| #include <boost/spirit/home/lex/reference.hpp> | |
| #include <boost/spirit/home/lex/lexer_type.hpp> | |
| #include <boost/spirit/home/lex/lexer/terminals.hpp> | |
| #include <boost/fusion/include/vector.hpp> | |
| #include <boost/mpl/if.hpp> | |
| #include <boost/detail/iterator.hpp> | |
| #include <boost/type_traits/is_same.hpp> | |
| #include <boost/variant.hpp> | |
| #include <string> | |
| #include <cstdlib> | |
| #if defined(BOOST_MSVC) | |
| # pragma warning(push) | |
| # pragma warning(disable: 4355) // 'this' : used in base member initializer list warning | |
| #endif | |
| namespace boost { namespace spirit { namespace lex | |
| { | |
| /////////////////////////////////////////////////////////////////////////// | |
| // This component represents a token definition | |
| /////////////////////////////////////////////////////////////////////////// | |
| template<typename Attribute = unused_type | |
| , typename Char = char | |
| , typename Idtype = std::size_t> | |
| struct token_def | |
| : proto::extends< | |
| typename proto::terminal< | |
| lex::reference<token_def<Attribute, Char, Idtype> const, Idtype> | |
| >::type | |
| , token_def<Attribute, Char, Idtype> > | |
| , qi::parser<token_def<Attribute, Char, Idtype> > | |
| , lex::lexer_type<token_def<Attribute, Char, Idtype> > | |
| { | |
| private: | |
| // initialize proto base class | |
| typedef lex::reference<token_def const, Idtype> reference_; | |
| typedef typename proto::terminal<reference_>::type terminal_type; | |
| typedef proto::extends<terminal_type, token_def> proto_base_type; | |
| static std::size_t const all_states_id = static_cast<std::size_t>(-2); | |
| public: | |
| // Qi interface: meta-function calculating parser return type | |
| template <typename Context, typename Iterator> | |
| struct attribute | |
| { | |
| // The return value of the token_def is either the specified | |
| // attribute type, or the pair of iterators from the match of the | |
| // corresponding token (if no attribute type has been specified), | |
| // or unused_type (if omit has been specified). | |
| typedef typename Iterator::base_iterator_type iterator_type; | |
| typedef typename mpl::if_< | |
| traits::not_is_unused<Attribute> | |
| , typename mpl::if_< | |
| is_same<Attribute, lex::omit>, unused_type, Attribute | |
| >::type | |
| , iterator_range<iterator_type> | |
| >::type type; | |
| }; | |
| public: | |
| // Qi interface: parse functionality | |
| template <typename Iterator, typename Context | |
| , typename Skipper, typename Attribute_> | |
| bool parse(Iterator& first, Iterator const& last | |
| , Context& /*context*/, Skipper const& skipper | |
| , Attribute_& attr) const | |
| { | |
| qi::skip_over(first, last, skipper); // always do a pre-skip | |
| if (first != last) { | |
| typedef typename | |
| boost::detail::iterator_traits<Iterator>::value_type | |
| token_type; | |
| // If the following assertion fires you probably forgot to | |
| // associate this token definition with a lexer instance. | |
| BOOST_ASSERT(std::size_t(~0) != token_state_); | |
| token_type const& t = *first; | |
| if (token_id_ == t.id() && | |
| (all_states_id == token_state_ || token_state_ == t.state())) | |
| { | |
| spirit::traits::assign_to(t, attr); | |
| ++first; | |
| return true; | |
| } | |
| } | |
| return false; | |
| } | |
| template <typename Context> | |
| info what(Context& /*context*/) const | |
| { | |
| if (0 == def_.which()) | |
| return info("token_def", get<string_type>(def_)); | |
| return info("token_def", get<char_type>(def_)); | |
| } | |
| /////////////////////////////////////////////////////////////////////// | |
| // Lex interface: collect token definitions and put it into the | |
| // provided lexer def | |
| 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 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 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 (0 == token_id_) | |
| token_id_ = lexdef.get_next_id(); | |
| if (0 == def_.which()) { | |
| unique_id_ = lexdef.add_token(state.c_str() | |
| , get<string_type>(def_), token_id_, target); | |
| } | |
| else { | |
| unique_id_ = lexdef.add_token(state.c_str() | |
| , get<char_type>(def_), token_id_, target); | |
| } | |
| } | |
| template <typename LexerDef> | |
| void add_actions(LexerDef&) const {} | |
| public: | |
| typedef Char char_type; | |
| typedef Idtype id_type; | |
| typedef std::basic_string<char_type> string_type; | |
| // Lex interface: constructing token definitions | |
| token_def() | |
| : proto_base_type(terminal_type::make(reference_(*this))) | |
| , def_('\0'), token_id_() | |
| , unique_id_(std::size_t(~0)), token_state_(std::size_t(~0)) {} | |
| token_def(token_def const& rhs) | |
| : proto_base_type(terminal_type::make(reference_(*this))) | |
| , def_(rhs.def_), token_id_(rhs.token_id_) | |
| , unique_id_(rhs.unique_id_), token_state_(rhs.token_state_) {} | |
| explicit token_def(char_type def_, Idtype id_ = Idtype()) | |
| : proto_base_type(terminal_type::make(reference_(*this))) | |
| , def_(def_) | |
| , token_id_(Idtype() == id_ ? Idtype(def_) : id_) | |
| , unique_id_(std::size_t(~0)), token_state_(std::size_t(~0)) {} | |
| explicit token_def(string_type const& def_, Idtype id_ = Idtype()) | |
| : proto_base_type(terminal_type::make(reference_(*this))) | |
| , def_(def_), token_id_(id_) | |
| , unique_id_(std::size_t(~0)), token_state_(std::size_t(~0)) {} | |
| template <typename String> | |
| token_def& operator= (String const& definition) | |
| { | |
| def_ = definition; | |
| token_id_ = Idtype(); | |
| unique_id_ = std::size_t(~0); | |
| token_state_ = std::size_t(~0); | |
| return *this; | |
| } | |
| token_def& operator= (token_def const& rhs) | |
| { | |
| def_ = rhs.def_; | |
| token_id_ = rhs.token_id_; | |
| unique_id_ = rhs.unique_id_; | |
| token_state_ = rhs.token_state_; | |
| return *this; | |
| } | |
| // general accessors | |
| Idtype const& id() const { return token_id_; } | |
| void id(Idtype const& id) { token_id_ = id; } | |
| std::size_t unique_id() const { return unique_id_; } | |
| string_type definition() const | |
| { | |
| return (0 == def_.which()) ? | |
| get<string_type>(def_) : string_type(1, get<char_type>(def_)); | |
| } | |
| std::size_t state() const { return token_state_; } | |
| private: | |
| variant<string_type, char_type> def_; | |
| mutable Idtype token_id_; | |
| mutable std::size_t unique_id_; | |
| mutable std::size_t token_state_; | |
| }; | |
| }}} | |
| namespace boost { namespace spirit { namespace traits | |
| { | |
| /////////////////////////////////////////////////////////////////////////// | |
| template<typename Attribute, typename Char, typename Idtype | |
| , typename Attr, typename Context, typename Iterator> | |
| struct handles_container< | |
| lex::token_def<Attribute, Char, Idtype>, Attr, Context, Iterator> | |
| : traits::is_container< | |
| typename attribute_of< | |
| lex::token_def<Attribute, Char, Idtype>, Context, Iterator | |
| >::type> | |
| {}; | |
| }}} | |
| #if defined(BOOST_MSVC) | |
| # pragma warning(pop) | |
| #endif | |
| #endif |