1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
// 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_CHAR_TOKEN_DEF_MAR_28_2007_0626PM)
#define BOOST_SPIRIT_LEX_CHAR_TOKEN_DEF_MAR_28_2007_0626PM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/support/common_terminals.hpp>
#include <boost/spirit/home/support/string_traits.hpp>
#include <boost/spirit/home/lex/domain.hpp>
#include <boost/spirit/home/lex/lexer_type.hpp>
#include <boost/spirit/home/lex/meta_compiler.hpp>
namespace boost { namespace spirit
{
///////////////////////////////////////////////////////////////////////////
// Enablers
///////////////////////////////////////////////////////////////////////////
template <>
struct use_terminal<lex::domain, char> // enables 'x'
: mpl::true_ {};
template <>
struct use_terminal<lex::domain, char[2]> // enables "x"
: mpl::true_ {};
template <>
struct use_terminal<lex::domain, wchar_t> // enables wchar_t
: mpl::true_ {};
template <>
struct use_terminal<lex::domain, wchar_t[2]> // enables L"x"
: mpl::true_ {};
template <typename CharEncoding, typename A0>
struct use_terminal<lex::domain
, terminal_ex<
tag::char_code<tag::char_, CharEncoding> // enables char_('x'), char_("x")
, fusion::vector1<A0>
>
> : mpl::true_ {};
}}
namespace boost { namespace spirit { namespace lex
{
// use char_ from standard character set by default
using spirit::standard::char_type;
using spirit::standard::char_;
///////////////////////////////////////////////////////////////////////////
//
// char_token_def
// represents a single character token definition
//
///////////////////////////////////////////////////////////////////////////
template <typename CharEncoding = char_encoding::standard>
struct char_token_def
: primitive_lexer<char_token_def<CharEncoding> >
{
typedef typename CharEncoding::char_type char_type;
char_token_def(char_type ch)
: ch(ch), unique_id_(std::size_t(~0)), token_state_(std::size_t(~0))
{}
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 char_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 char_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;
unique_id_ = lexdef.add_token (state.c_str(), ch
, static_cast<std::size_t>(ch), target);
}
template <typename LexerDef>
void add_actions(LexerDef&) const {}
std::size_t id() const { return static_cast<std::size_t>(ch); }
std::size_t unique_id() const { return unique_id_; }
std::size_t state() const { return token_state_; }
char_type ch;
mutable std::size_t unique_id_;
mutable std::size_t token_state_;
};
///////////////////////////////////////////////////////////////////////////
// Lexer generators: make_xxx function (objects)
///////////////////////////////////////////////////////////////////////////
namespace detail
{
template <typename CharEncoding>
struct basic_literal
{
typedef char_token_def<CharEncoding> result_type;
template <typename Char>
result_type operator()(Char ch, unused_type) const
{
return result_type(ch);
}
template <typename Char>
result_type operator()(Char const* str, unused_type) const
{
return result_type(str[0]);
}
};
}
// literals: 'x', "x"
template <typename Modifiers>
struct make_primitive<char, Modifiers>
: detail::basic_literal<char_encoding::standard> {};
template <typename Modifiers>
struct make_primitive<char const(&)[2], Modifiers>
: detail::basic_literal<char_encoding::standard> {};
// literals: L'x', L"x"
template <typename Modifiers>
struct make_primitive<wchar_t, Modifiers>
: detail::basic_literal<char_encoding::standard_wide> {};
template <typename Modifiers>
struct make_primitive<wchar_t const(&)[2], Modifiers>
: detail::basic_literal<char_encoding::standard_wide> {};
// handle char_('x')
template <typename CharEncoding, typename Modifiers, typename A0>
struct make_primitive<
terminal_ex<
tag::char_code<tag::char_, CharEncoding>
, fusion::vector1<A0>
>
, Modifiers>
{
typedef char_token_def<CharEncoding> result_type;
template <typename Terminal>
result_type operator()(Terminal const& term, unused_type) const
{
return result_type(fusion::at_c<0>(term.args));
}
};
// handle char_("x")
template <typename CharEncoding, typename Modifiers, typename Char>
struct make_primitive<
terminal_ex<
tag::char_code<tag::char_, CharEncoding>
, fusion::vector1<Char(&)[2]> // single char strings
>
, Modifiers>
{
typedef char_token_def<CharEncoding> result_type;
template <typename Terminal>
result_type operator()(Terminal const& term, unused_type) const
{
return result_type(fusion::at_c<0>(term.args)[0]);
}
};
}}} // namespace boost::spirit::lex
#endif
|
Swift