1// Copyright (c) 2001-2011 Hartmut Kaiser
2// Copyright (c) 2011 Thomas Heller
3//
4// Distributed under the Boost Software License, Version 1.0. (See accompanying
5// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6
7#ifndef BOOST_SPIRIT_LEX_LEXER_SUPPORT_FUNCTIONS_EXPRESSION_HPP
8#define BOOST_SPIRIT_LEX_LEXER_SUPPORT_FUNCTIONS_EXPRESSION_HPP
9
10#if defined(_MSC_VER)
11#pragma once
12#endif
13
14#include <boost/phoenix/core/expression.hpp>
15#include <boost/phoenix/core/v2_eval.hpp>
16#include <boost/proto/proto_fwd.hpp> // for transform placeholders
17
18namespace boost { namespace spirit { namespace lex
19{
20 template <typename> struct less_type;
21 struct more_type;
22 template <typename, typename> struct lookahead_type;
23}}}
24
25///////////////////////////////////////////////////////////////////////////////
26
27BOOST_PHOENIX_DEFINE_EXPRESSION(
28 (boost)(spirit)(lex)(less)
29 , (boost::phoenix::meta_grammar)
30)
31
32BOOST_PHOENIX_DEFINE_EXPRESSION(
33 (boost)(spirit)(lex)(lookahead)
34 , (boost::phoenix::meta_grammar)
35 (boost::phoenix::meta_grammar)
36)
37
38namespace boost { namespace phoenix
39{
40
41 namespace result_of
42 {
43 template <>
44 struct is_nullary<custom_terminal<boost::spirit::lex::more_type> >
45 : mpl::false_
46 {};
47 }
48
49 template <typename Dummy>
50 struct is_custom_terminal<boost::spirit::lex::more_type, Dummy> : mpl::true_ {};
51
52 template <typename Dummy>
53 struct custom_terminal<boost::spirit::lex::more_type, Dummy>
54 : proto::call<
55 v2_eval(
56 proto::make<boost::spirit::lex::more_type()>
57 , proto::call<functional::env(proto::_state)>
58 )
59 >
60 {};
61
62
63 template <typename Dummy>
64 struct is_nullary::when<spirit::lex::rule::less, Dummy>
65 : proto::make<mpl::false_()>
66 {};
67
68 template <typename Dummy>
69 struct default_actions::when<spirit::lex::rule::less, Dummy>
70 : proto::call<
71 v2_eval(
72 proto::make<
73 spirit::lex::less_type<proto::_child0>(proto::_child0)
74 >
75 , _env
76 )
77 >
78 {};
79
80 template <typename Dummy>
81 struct is_nullary::when<spirit::lex::rule::lookahead, Dummy>
82 : proto::make<mpl::false_()>
83 {};
84
85 template <typename Dummy>
86 struct default_actions::when<spirit::lex::rule::lookahead, Dummy>
87 : proto::call<
88 v2_eval(
89 proto::make<
90 spirit::lex::lookahead_type<
91 proto::_child0
92 , proto::_child1
93 >(
94 proto::_child0
95 , proto::_child1
96 )
97 >
98 , _env
99 )
100 >
101 {};
102}}
103
104#endif
105

source code of boost/libs/spirit/include/boost/spirit/home/lex/lexer/support_functions_expression.hpp