1 // Copyright (c) 2001-2011 Hartmut Kaiser 2 // 3 // Distributed under the Boost Software License, Version 1.0. (See accompanying 4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 5 6 #if !defined(BOOST_SPIRIT_LEX_STRING_TOKEN_DEF_MAR_28_2007_0722PM) 7 #define BOOST_SPIRIT_LEX_STRING_TOKEN_DEF_MAR_28_2007_0722PM 8 9 #if defined(_MSC_VER) 10 #pragma once 11 #endif 12 13 #include <boost/spirit/home/support/common_terminals.hpp> 14 #include <boost/spirit/home/support/string_traits.hpp> 15 #include <boost/spirit/home/lex/domain.hpp> 16 #include <boost/spirit/home/lex/lexer_type.hpp> 17 #include <boost/spirit/home/lex/meta_compiler.hpp> 18 #include <boost/type_traits/add_const.hpp> 19 #include <boost/type_traits/add_reference.hpp> 20 #include <boost/type_traits/is_integral.hpp> 21 #include <boost/type_traits/remove_const.hpp> 22 #include <boost/fusion/include/vector.hpp> 23 #include <boost/fusion/include/at.hpp> 24 25 namespace boost { namespace spirit 26 { 27 /////////////////////////////////////////////////////////////////////////// 28 // Enablers 29 /////////////////////////////////////////////////////////////////////////// 30 31 // enables strings 32 template <typename T> 33 struct use_terminal<lex::domain, T 34 , typename enable_if<traits::is_string<T> >::type> 35 : mpl::true_ {}; 36 37 // enables string(str) 38 template <typename CharEncoding, typename A0> 39 struct use_terminal<lex::domain 40 , terminal_ex< 41 tag::char_code<tag::string, CharEncoding> 42 , fusion::vector1<A0> > > 43 : traits::is_string<A0> {}; 44 45 // enables string(str, ID) 46 template <typename CharEncoding, typename A0, typename A1> 47 struct use_terminal<lex::domain 48 , terminal_ex< 49 tag::char_code<tag::string, CharEncoding> 50 , fusion::vector2<A0, A1> > > 51 : traits::is_string<A0> {}; 52 }} 53 54 namespace boost { namespace spirit { namespace lex 55 { 56 // use string from standard character set by default 57 #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS 58 using spirit::standard::string; 59 #endif 60 using spirit::standard::string_type; 61 62 /////////////////////////////////////////////////////////////////////////// 63 // 64 // string_token_def 65 // represents a string based token definition 66 // 67 /////////////////////////////////////////////////////////////////////////// 68 template <typename String, typename IdType = std::size_t 69 , typename CharEncoding = char_encoding::standard> 70 struct string_token_def 71 : primitive_lexer<string_token_def<String, IdType, CharEncoding> > 72 { 73 typedef typename 74 remove_const<typename traits::char_type_of<String>::type>::type 75 char_type; 76 typedef std::basic_string<char_type> string_type; 77 string_token_defboost::spirit::lex::string_token_def78 string_token_def(typename add_reference<String>::type str, IdType const& id) 79 : str_(str), id_(id), unique_id_(std::size_t(~0)) 80 , token_state_(std::size_t(~0)) 81 {} 82 83 template <typename LexerDef, typename String_> collectboost::spirit::lex::string_token_def84 void collect(LexerDef& lexdef, String_ const& state 85 , String_ const& targetstate) const 86 { 87 std::size_t state_id = lexdef.add_state(state.c_str()); 88 89 // If the following assertion fires you are probably trying to use 90 // a single string_token_def instance in more than one lexer state. 91 // This is not possible. Please create a separate token_def instance 92 // from the same regular expression for each lexer state it needs 93 // to be associated with. 94 BOOST_ASSERT( 95 (std::size_t(~0) == token_state_ || state_id == token_state_) && 96 "Can't use single string_token_def with more than one lexer state"); 97 98 char_type const* target = targetstate.empty() ? 0 : targetstate.c_str(); 99 if (target) 100 lexdef.add_state(target); 101 102 token_state_ = state_id; 103 104 if (IdType(~0) == id_) 105 id_ = IdType(lexdef.get_next_id()); 106 107 unique_id_ = lexdef.add_token (state.c_str(), str_, id_, target); 108 } 109 110 template <typename LexerDef> add_actionsboost::spirit::lex::string_token_def111 void add_actions(LexerDef&) const {} 112 idboost::spirit::lex::string_token_def113 std::size_t id() const { return id_; } unique_idboost::spirit::lex::string_token_def114 std::size_t unique_id() const { return unique_id_; } stateboost::spirit::lex::string_token_def115 std::size_t state() const { return token_state_; } 116 117 string_type str_; 118 mutable IdType id_; 119 mutable std::size_t unique_id_; 120 mutable std::size_t token_state_; 121 }; 122 123 /////////////////////////////////////////////////////////////////////////// 124 // Lex generators: make_xxx function (objects) 125 /////////////////////////////////////////////////////////////////////////// 126 template <typename T, typename Modifiers> 127 struct make_primitive<T, Modifiers 128 , typename enable_if<traits::is_string<T> >::type> 129 { 130 typedef typename add_const<T>::type const_string; 131 typedef string_token_def<const_string> result_type; 132 operator ()boost::spirit::lex::make_primitive133 result_type operator()( 134 typename add_reference<const_string>::type str, unused_type) const 135 { 136 return result_type(str, std::size_t(~0)); 137 } 138 }; 139 140 template <typename Modifiers, typename CharEncoding, typename A0> 141 struct make_primitive< 142 terminal_ex< 143 tag::char_code<tag::string, CharEncoding> 144 , fusion::vector1<A0> > 145 , Modifiers> 146 { 147 typedef typename add_const<A0>::type const_string; 148 typedef string_token_def<const_string, std::size_t, CharEncoding> 149 result_type; 150 151 template <typename Terminal> operator ()boost::spirit::lex::make_primitive152 result_type operator()(Terminal const& term, unused_type) const 153 { 154 return result_type(fusion::at_c<0>(term.args), std::size_t(~0)); 155 } 156 }; 157 158 template <typename Modifiers, typename CharEncoding, typename A0, typename A1> 159 struct make_primitive< 160 terminal_ex< 161 tag::char_code<tag::string, CharEncoding> 162 , fusion::vector2<A0, A1> > 163 , Modifiers> 164 { 165 typedef typename add_const<A0>::type const_string; 166 typedef string_token_def<const_string, A1, CharEncoding> result_type; 167 168 template <typename Terminal> operator ()boost::spirit::lex::make_primitive169 result_type operator()(Terminal const& term, unused_type) const 170 { 171 return result_type( 172 fusion::at_c<0>(term.args), fusion::at_c<1>(term.args)); 173 } 174 }; 175 }}} // namespace boost::spirit::lex 176 177 #endif 178