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1 | /*============================================================================= | |
2 | Copyright (c) 1998-2002 Joel de Guzman | |
3 | http://spirit.sourceforge.net/ | |
4 | ||
5 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
6 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
7 | =============================================================================*/ | |
8 | #if !defined(BOOST_SPIRIT_SCANNER_HPP) | |
9 | #define BOOST_SPIRIT_SCANNER_HPP | |
10 | ||
11 | #include <iterator> | |
12 | #include <boost/config.hpp> | |
13 | #include <boost/spirit/home/classic/namespace.hpp> | |
14 | #include <boost/spirit/home/classic/core/match.hpp> | |
15 | #include <boost/spirit/home/classic/core/non_terminal/parser_id.hpp> | |
16 | ||
17 | #include <boost/spirit/home/classic/core/scanner/scanner_fwd.hpp> | |
18 | ||
19 | namespace boost { namespace spirit { | |
20 | ||
21 | BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN | |
22 | ||
23 | /////////////////////////////////////////////////////////////////////////// | |
24 | // | |
25 | // iteration_policy class | |
26 | // | |
27 | /////////////////////////////////////////////////////////////////////////// | |
28 | struct iteration_policy | |
29 | { | |
30 | template <typename ScannerT> | |
31 | void | |
32 | advance(ScannerT const& scan) const | |
33 | { | |
34 | ++scan.first; | |
35 | } | |
36 | ||
37 | template <typename ScannerT> | |
38 | bool at_end(ScannerT const& scan) const | |
39 | { | |
40 | return scan.first == scan.last; | |
41 | } | |
42 | ||
43 | template <typename T> | |
44 | T filter(T ch) const | |
45 | { | |
46 | return ch; | |
47 | } | |
48 | ||
49 | template <typename ScannerT> | |
50 | typename ScannerT::ref_t | |
51 | get(ScannerT const& scan) const | |
52 | { | |
53 | return *scan.first; | |
54 | } | |
55 | }; | |
56 | ||
57 | /////////////////////////////////////////////////////////////////////////// | |
58 | // | |
59 | // match_policy class | |
60 | // | |
61 | /////////////////////////////////////////////////////////////////////////// | |
62 | struct match_policy | |
63 | { | |
64 | template <typename T> | |
65 | struct result { typedef match<T> type; }; | |
66 | ||
67 | const match<nil_t> | |
68 | no_match() const | |
69 | { | |
70 | return match<nil_t>(); | |
71 | } | |
72 | ||
73 | const match<nil_t> | |
74 | empty_match() const | |
75 | { | |
76 | return match<nil_t>(0, nil_t()); | |
77 | } | |
78 | ||
79 | template <typename AttrT, typename IteratorT> | |
80 | match<AttrT> | |
81 | create_match( | |
82 | std::size_t length, | |
83 | AttrT const& val, | |
84 | IteratorT const& /*first*/, | |
85 | IteratorT const& /*last*/) const | |
86 | { | |
87 | return match<AttrT>(length, val); | |
88 | } | |
89 | ||
90 | template <typename MatchT, typename IteratorT> | |
91 | void group_match( | |
92 | MatchT& /*m*/, | |
93 | parser_id const& /*id*/, | |
94 | IteratorT const& /*first*/, | |
95 | IteratorT const& /*last*/) const {} | |
96 | ||
97 | template <typename Match1T, typename Match2T> | |
98 | void concat_match(Match1T& l, Match2T const& r) const | |
99 | { | |
100 | l.concat(r); | |
101 | } | |
102 | }; | |
103 | ||
104 | /////////////////////////////////////////////////////////////////////////// | |
105 | // | |
106 | // match_result class | |
107 | // | |
108 | /////////////////////////////////////////////////////////////////////////// | |
109 | template <typename MatchPolicyT, typename T> | |
110 | struct match_result | |
111 | { | |
112 | typedef typename MatchPolicyT::template result<T>::type type; | |
113 | }; | |
114 | ||
115 | /////////////////////////////////////////////////////////////////////////// | |
116 | // | |
117 | // action_policy class | |
118 | // | |
119 | /////////////////////////////////////////////////////////////////////////// | |
120 | template <typename AttrT> | |
121 | struct attributed_action_policy | |
122 | { | |
123 | template <typename ActorT, typename IteratorT> | |
124 | static void | |
125 | call( | |
126 | ActorT const& actor, | |
127 | AttrT& val, | |
128 | IteratorT const&, | |
129 | IteratorT const&) | |
130 | { | |
131 | actor(val); | |
132 | } | |
133 | }; | |
134 | ||
135 | ////////////////////////////////// | |
136 | template <> | |
137 | struct attributed_action_policy<nil_t> | |
138 | { | |
139 | template <typename ActorT, typename IteratorT> | |
140 | static void | |
141 | call( | |
142 | ActorT const& actor, | |
143 | nil_t, | |
144 | IteratorT const& first, | |
145 | IteratorT const& last) | |
146 | { | |
147 | actor(first, last); | |
148 | } | |
149 | }; | |
150 | ||
151 | ////////////////////////////////// | |
152 | struct action_policy | |
153 | { | |
154 | template <typename ActorT, typename AttrT, typename IteratorT> | |
155 | void | |
156 | do_action( | |
157 | ActorT const& actor, | |
158 | AttrT& val, | |
159 | IteratorT const& first, | |
160 | IteratorT const& last) const | |
161 | { | |
162 | attributed_action_policy<AttrT>::call(actor, val, first, last); | |
163 | } | |
164 | }; | |
165 | ||
166 | /////////////////////////////////////////////////////////////////////////// | |
167 | // | |
168 | // scanner_policies class | |
169 | // | |
170 | /////////////////////////////////////////////////////////////////////////// | |
171 | template < | |
172 | typename IterationPolicyT, | |
173 | typename MatchPolicyT, | |
174 | typename ActionPolicyT> | |
175 | struct scanner_policies : | |
176 | public IterationPolicyT, | |
177 | public MatchPolicyT, | |
178 | public ActionPolicyT | |
179 | { | |
180 | typedef IterationPolicyT iteration_policy_t; | |
181 | typedef MatchPolicyT match_policy_t; | |
182 | typedef ActionPolicyT action_policy_t; | |
183 | ||
184 | scanner_policies( | |
185 | IterationPolicyT const& i_policy = IterationPolicyT(), | |
186 | MatchPolicyT const& m_policy = MatchPolicyT(), | |
187 | ActionPolicyT const& a_policy = ActionPolicyT()) | |
188 | : IterationPolicyT(i_policy) | |
189 | , MatchPolicyT(m_policy) | |
190 | , ActionPolicyT(a_policy) {} | |
191 | ||
192 | template <typename ScannerPoliciesT> | |
193 | scanner_policies(ScannerPoliciesT const& policies) | |
194 | : IterationPolicyT(policies) | |
195 | , MatchPolicyT(policies) | |
196 | , ActionPolicyT(policies) {} | |
197 | }; | |
198 | ||
199 | /////////////////////////////////////////////////////////////////////////// | |
200 | // | |
201 | // scanner_policies_base class: the base class of all scanners | |
202 | // | |
203 | /////////////////////////////////////////////////////////////////////////// | |
204 | struct scanner_base {}; | |
205 | ||
206 | /////////////////////////////////////////////////////////////////////////// | |
207 | // | |
208 | // scanner class | |
209 | // | |
210 | /////////////////////////////////////////////////////////////////////////// | |
211 | template < | |
212 | typename IteratorT, | |
213 | typename PoliciesT> | |
214 | class scanner : public PoliciesT, public scanner_base | |
215 | { | |
216 | public: | |
217 | ||
218 | typedef IteratorT iterator_t; | |
219 | typedef PoliciesT policies_t; | |
220 | ||
221 | typedef typename std:: | |
222 | iterator_traits<IteratorT>::value_type value_t; | |
223 | typedef typename std:: | |
224 | iterator_traits<IteratorT>::reference ref_t; | |
225 | typedef typename boost:: | |
226 | call_traits<IteratorT>::param_type iter_param_t; | |
227 | ||
228 | scanner( | |
229 | IteratorT& first_, | |
230 | iter_param_t last_, | |
231 | PoliciesT const& policies = PoliciesT()) | |
232 | : PoliciesT(policies), first(first_), last(last_) | |
233 | { | |
234 | at_end(); | |
235 | } | |
236 | ||
237 | scanner(scanner const& other) | |
238 | : PoliciesT(other), first(other.first), last(other.last) {} | |
239 | ||
240 | scanner(scanner const& other, IteratorT& first_) | |
241 | : PoliciesT(other), first(first_), last(other.last) {} | |
242 | ||
243 | template <typename PoliciesT1> | |
244 | scanner(scanner<IteratorT, PoliciesT1> const& other) | |
245 | : PoliciesT(other), first(other.first), last(other.last) {} | |
246 | ||
247 | bool | |
248 | at_end() const | |
249 | { | |
250 | typedef typename PoliciesT::iteration_policy_t iteration_policy_type; | |
251 | return iteration_policy_type::at_end(*this); | |
252 | } | |
253 | ||
254 | value_t | |
255 | operator*() const | |
256 | { | |
257 | typedef typename PoliciesT::iteration_policy_t iteration_policy_type; | |
258 | return iteration_policy_type::filter(iteration_policy_type::get(*this)); | |
259 | } | |
260 | ||
261 | scanner const& | |
262 | operator++() const | |
263 | { | |
264 | typedef typename PoliciesT::iteration_policy_t iteration_policy_type; | |
265 | iteration_policy_type::advance(*this); | |
266 | return *this; | |
267 | } | |
268 | ||
269 | template <typename PoliciesT2> | |
270 | struct rebind_policies | |
271 | { | |
272 | typedef scanner<IteratorT, PoliciesT2> type; | |
273 | }; | |
274 | ||
275 | template <typename PoliciesT2> | |
276 | scanner<IteratorT, PoliciesT2> | |
277 | change_policies(PoliciesT2 const& policies) const | |
278 | { | |
279 | return scanner<IteratorT, PoliciesT2>(first, last, policies); | |
280 | } | |
281 | ||
282 | template <typename IteratorT2> | |
283 | struct rebind_iterator | |
284 | { | |
285 | typedef scanner<IteratorT2, PoliciesT> type; | |
286 | }; | |
287 | ||
288 | template <typename IteratorT2> | |
289 | scanner<IteratorT2, PoliciesT> | |
290 | change_iterator(IteratorT2 const& first_, IteratorT2 const &last_) const | |
291 | { | |
292 | return scanner<IteratorT2, PoliciesT>(first_, last_, *this); | |
293 | } | |
294 | ||
295 | IteratorT& first; | |
296 | IteratorT const last; | |
297 | ||
298 | private: | |
299 | ||
300 | scanner& | |
301 | operator=(scanner const& other); | |
302 | }; | |
303 | ||
304 | /////////////////////////////////////////////////////////////////////////// | |
305 | // | |
306 | // rebind_scanner_policies class | |
307 | // | |
308 | /////////////////////////////////////////////////////////////////////////// | |
309 | template <typename ScannerT, typename PoliciesT> | |
310 | struct rebind_scanner_policies | |
311 | { | |
312 | typedef typename ScannerT::template | |
313 | rebind_policies<PoliciesT>::type type; | |
314 | }; | |
315 | ||
316 | ////////////////////////////////// | |
317 | template <typename ScannerT, typename IteratorT> | |
318 | struct rebind_scanner_iterator | |
319 | { | |
320 | typedef typename ScannerT::template | |
321 | rebind_iterator<IteratorT>::type type; | |
322 | }; | |
323 | ||
324 | BOOST_SPIRIT_CLASSIC_NAMESPACE_END | |
325 | ||
326 | }} | |
327 | ||
328 | #endif |