152 lines
4.9 KiB
C++
Executable File
152 lines
4.9 KiB
C++
Executable File
// Copyright (c) 2001-2007 Joel de Guzman
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// Copyright (c) 2001-2008 Hartmut Kaiser
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#if !defined(BOOST_SPIRIT_LEX_LEXER_META_GRAMMAR_MAR_22_2007_0548PM)
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#define BOOST_SPIRIT_LEX_LEXER_META_GRAMMAR_MAR_22_2007_0548PM
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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#pragma once // MS compatible compilers support #pragma once
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#endif
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#include <boost/spirit/home/lex/domain.hpp>
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#include <boost/spirit/home/lex/lexer/lexer_fwd.hpp>
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#include <boost/spirit/home/lex/lexer/terminal_holder.hpp>
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#include <boost/spirit/home/support/placeholders.hpp>
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#include <boost/spirit/home/support/meta_grammar.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/mpl/bool.hpp>
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namespace boost { namespace spirit { namespace lex
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{
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///////////////////////////////////////////////////////////////////////////
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// forward declarations
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///////////////////////////////////////////////////////////////////////////
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struct terminal_director;
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struct sequence;
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struct action;
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struct string_token_def;
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struct char_token_def;
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struct lexer_meta_grammar;
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template <typename Expr, typename Enable>
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struct is_valid_expr;
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template <typename Expr, typename Enable>
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struct expr_transform;
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///////////////////////////////////////////////////////////////////////////
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// main lexer_meta_grammar in the lex namespace
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///////////////////////////////////////////////////////////////////////////
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struct token_def_meta_grammar
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: proto::or_<
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// token_def<>
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meta_grammar::terminal_rule<
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lex::domain,
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terminal_holder<proto::_, lex::token_def<proto::_, proto::_, proto::_> >,
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terminal_director
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>,
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// token_set
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meta_grammar::terminal_rule<
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lex::domain,
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terminal_holder<proto::_, lex::token_set<proto::_> >,
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terminal_director
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>
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>
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{
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};
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// 'x', L'x', "x", L"x", std::string, std::wstring
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struct literal_token_def_meta_grammar
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: proto::or_<
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meta_grammar::terminal_rule<
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lex::domain, char, char_token_def
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>,
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meta_grammar::terminal_rule<
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lex::domain, wchar_t, char_token_def
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>,
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meta_grammar::terminal_rule<
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lex::domain, char const*, string_token_def
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>,
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meta_grammar::terminal_rule<
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lex::domain, wchar_t const*, string_token_def
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>,
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meta_grammar::terminal_rule<
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lex::domain,
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std::basic_string<char, proto::_, proto::_>,
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string_token_def
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>,
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meta_grammar::terminal_rule<
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lex::domain,
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std::basic_string<wchar_t, proto::_, proto::_>,
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string_token_def
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>
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>
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{
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};
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struct action_lexer_meta_grammar
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: proto::or_<
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// semantic actions for tokens
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meta_grammar::binary_rule<
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lex::domain, proto::tag::subscript, action,
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token_def_meta_grammar, proto::when<proto::_, proto::_arg>
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>,
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meta_grammar::binary_rule<
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lex::domain, proto::tag::subscript, action,
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action_lexer_meta_grammar, proto::when<proto::_, proto::_arg>
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>
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>
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{
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};
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struct lexer_meta_grammar
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: proto::or_<
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// token_def<>, ' ', L' ', "...", L"...", std::string, std::wstring
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token_def_meta_grammar,
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literal_token_def_meta_grammar,
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// token_def[...]
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action_lexer_meta_grammar,
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// sequence delimited by '|'
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meta_grammar::binary_rule_flat<
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lex::domain, proto::tag::bitwise_or, sequence,
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lexer_meta_grammar
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>
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>
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{
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};
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///////////////////////////////////////////////////////////////////////////
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// These specializations non-intrusively hook into the Lex meta-grammar.
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// (see lex/meta_grammar.hpp)
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///////////////////////////////////////////////////////////////////////////
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template <typename Expr>
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struct is_valid_expr<
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Expr,
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typename enable_if<
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proto::matches<Expr, lexer_meta_grammar>
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>::type
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>
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: mpl::true_
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{
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};
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template <typename Expr>
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struct expr_transform<
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Expr,
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typename enable_if<
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proto::matches<Expr, lexer_meta_grammar>
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>::type
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>
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: mpl::identity<lexer_meta_grammar>
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{
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};
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}}}
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#endif
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