1/*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
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#if !defined(BOOST_SPIRIT_EPS_MARCH_23_2007_0454PM)
8#define BOOST_SPIRIT_EPS_MARCH_23_2007_0454PM
9
10#if defined(_MSC_VER)
11#pragma once
12#endif
13
14#include <boost/spirit/home/qi/domain.hpp>
15#include <boost/spirit/home/qi/skip_over.hpp>
16#include <boost/spirit/home/qi/meta_compiler.hpp>
17#include <boost/spirit/home/support/unused.hpp>
18#include <boost/spirit/home/support/info.hpp>
19#include <boost/spirit/home/support/common_terminals.hpp>
20#include <boost/fusion/include/at.hpp>
21#include <boost/type_traits/is_convertible.hpp>
22
23namespace boost { namespace spirit
24{
25 ///////////////////////////////////////////////////////////////////////////
26 // Enablers
27 ///////////////////////////////////////////////////////////////////////////
28 template <>
29 struct use_terminal<qi::domain, tag::eps> // enables eps
30 : mpl::true_ {};
31
32 template <typename A0>
33 struct use_terminal<qi::domain
34 , terminal_ex<tag::eps, fusion::vector1<A0> > // enables eps(bool-condition)
35 > : is_convertible<A0, bool> {};
36
37 template <> // enables eps(f)
38 struct use_lazy_terminal<
39 qi::domain, tag::eps, 1 /*arity*/
40 > : mpl::true_ {};
41}}
42
43namespace boost { namespace spirit { namespace qi
44{
45#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
46 using spirit::eps;
47#endif
48 using spirit::eps_type;
49
50 struct eps_parser : primitive_parser<eps_parser>
51 {
52 template <typename Context, typename Iterator>
53 struct attribute
54 {
55 typedef unused_type type;
56 };
57
58 template <typename Iterator, typename Context
59 , typename Skipper, typename Attribute>
60 bool parse(Iterator& first, Iterator const& last
61 , Context& /*context*/, Skipper const& skipper
62 , Attribute& /*attr*/) const
63 {
64 qi::skip_over(first, last, skipper);
65 return true;
66 }
67
68 template <typename Context>
69 info what(Context& /*context*/) const
70 {
71 return info("eps");
72 }
73 };
74
75 struct semantic_predicate : primitive_parser<semantic_predicate>
76 {
77 template <typename Context, typename Iterator>
78 struct attribute
79 {
80 typedef unused_type type;
81 };
82
83 semantic_predicate(bool predicate_)
84 : predicate(predicate_) {}
85
86 template <typename Iterator, typename Context
87 , typename Skipper, typename Attribute>
88 bool parse(Iterator& first, Iterator const& last
89 , Context& /*context*/, Skipper const& skipper
90 , Attribute& /*attr*/) const
91 {
92 qi::skip_over(first, last, skipper);
93 return predicate;
94 }
95
96 template <typename Context>
97 info what(Context& /*context*/) const
98 {
99 return info("semantic-predicate");
100 }
101
102 bool predicate;
103 };
104
105 ///////////////////////////////////////////////////////////////////////////
106 // Parser generators: make_xxx function (objects)
107 ///////////////////////////////////////////////////////////////////////////
108 template <typename Modifiers>
109 struct make_primitive<tag::eps, Modifiers>
110 {
111 typedef eps_parser result_type;
112 result_type operator()(unused_type, unused_type) const
113 {
114 return result_type();
115 }
116 };
117
118 template <typename Modifiers, typename A0>
119 struct make_primitive<
120 terminal_ex<tag::eps, fusion::vector1<A0> >
121 , Modifiers>
122 {
123 typedef semantic_predicate result_type;
124 template <typename Terminal>
125 result_type operator()(Terminal const& term, unused_type) const
126 {
127 return result_type(fusion::at_c<0>(term.args) ? true : false);
128 }
129 };
130}}}
131
132#endif
133

source code of qtlocation/src/3rdparty/mapbox-gl-native/deps/boost/1.65.1/include/boost/spirit/home/qi/auxiliary/eps.hpp