1// Boost string_algo library classification.hpp header file ---------------------------//
2
3// Copyright Pavol Droba 2002-2003.
4//
5// Distributed under the Boost Software License, Version 1.0.
6// (See accompanying file LICENSE_1_0.txt or copy at
7// http://www.boost.org/LICENSE_1_0.txt)
8
9// See http://www.boost.org/ for updates, documentation, and revision history.
10
11#ifndef BOOST_STRING_CLASSIFICATION_DETAIL_HPP
12#define BOOST_STRING_CLASSIFICATION_DETAIL_HPP
13
14#include <boost/algorithm/string/config.hpp>
15#include <algorithm>
16#include <cstring>
17#include <functional>
18#include <locale>
19
20#include <boost/range/begin.hpp>
21#include <boost/range/distance.hpp>
22#include <boost/range/end.hpp>
23
24#include <boost/algorithm/string/predicate_facade.hpp>
25#include <boost/type_traits/remove_const.hpp>
26
27namespace boost {
28 namespace algorithm {
29 namespace detail {
30
31// classification functors -----------------------------------------------//
32
33 // is_classified functor
34 struct is_classifiedF :
35 public predicate_facade<is_classifiedF>
36 {
37 // Boost.ResultOf support
38 typedef bool result_type;
39
40 // Constructor from a locale
41 is_classifiedF(std::ctype_base::mask Type, std::locale const & Loc = std::locale()) :
42 m_Type(Type), m_Locale(Loc) {}
43 // Operation
44 template<typename CharT>
45 bool operator()( CharT Ch ) const
46 {
47 return std::use_facet< std::ctype<CharT> >(m_Locale).is( m_Type, Ch );
48 }
49
50 #if defined(BOOST_BORLANDC) && (BOOST_BORLANDC >= 0x560) && (BOOST_BORLANDC <= 0x582) && !defined(_USE_OLD_RW_STL)
51 template<>
52 bool operator()( char const Ch ) const
53 {
54 return std::use_facet< std::ctype<char> >(m_Locale).is( m_Type, Ch );
55 }
56 #endif
57
58 private:
59 std::ctype_base::mask m_Type;
60 std::locale m_Locale;
61 };
62
63
64 // is_any_of functor
65 /*
66 returns true if the value is from the specified set
67 */
68 template<typename CharT>
69 struct is_any_ofF :
70 public predicate_facade<is_any_ofF<CharT> >
71 {
72 private:
73 // set cannot operate on const value-type
74 typedef typename ::boost::remove_const<CharT>::type set_value_type;
75
76 public:
77 // Boost.ResultOf support
78 typedef bool result_type;
79
80 // Constructor
81 template<typename RangeT>
82 is_any_ofF( const RangeT& Range ) : m_Size(0)
83 {
84 // Prepare storage
85 m_Storage.m_dynSet=0;
86
87 std::size_t Size=::boost::distance(Range);
88 m_Size=Size;
89 set_value_type* Storage=0;
90
91 if(use_fixed_storage(size: m_Size))
92 {
93 // Use fixed storage
94 Storage=&m_Storage.m_fixSet[0];
95 }
96 else
97 {
98 // Use dynamic storage
99 m_Storage.m_dynSet=new set_value_type[m_Size];
100 Storage=m_Storage.m_dynSet;
101 }
102
103 // Use fixed storage
104 ::std::copy(::boost::begin(Range), ::boost::end(Range), Storage);
105 ::std::sort(Storage, Storage+m_Size);
106 }
107
108 // Copy constructor
109 is_any_ofF(const is_any_ofF& Other) : m_Size(Other.m_Size)
110 {
111 // Prepare storage
112 m_Storage.m_dynSet=0;
113 const set_value_type* SrcStorage=0;
114 set_value_type* DestStorage=0;
115
116 if(use_fixed_storage(size: m_Size))
117 {
118 // Use fixed storage
119 DestStorage=&m_Storage.m_fixSet[0];
120 SrcStorage=&Other.m_Storage.m_fixSet[0];
121 }
122 else
123 {
124 // Use dynamic storage
125 m_Storage.m_dynSet=new set_value_type[m_Size];
126 DestStorage=m_Storage.m_dynSet;
127 SrcStorage=Other.m_Storage.m_dynSet;
128 }
129
130 // Use fixed storage
131 ::std::memcpy(dest: DestStorage, src: SrcStorage, n: sizeof(set_value_type)*m_Size);
132 }
133
134 // Destructor
135 ~is_any_ofF()
136 {
137 if(!use_fixed_storage(size: m_Size) && m_Storage.m_dynSet!=0)
138 {
139 delete [] m_Storage.m_dynSet;
140 }
141 }
142
143 // Assignment
144 is_any_ofF& operator=(const is_any_ofF& Other)
145 {
146 // Handle self assignment
147 if(this==&Other) return *this;
148
149 // Prepare storage
150 const set_value_type* SrcStorage;
151 set_value_type* DestStorage;
152
153 if(use_fixed_storage(size: Other.m_Size))
154 {
155 // Use fixed storage
156 DestStorage=&m_Storage.m_fixSet[0];
157 SrcStorage=&Other.m_Storage.m_fixSet[0];
158
159 // Delete old storage if was present
160 if(!use_fixed_storage(size: m_Size) && m_Storage.m_dynSet!=0)
161 {
162 delete [] m_Storage.m_dynSet;
163 }
164
165 // Set new size
166 m_Size=Other.m_Size;
167 }
168 else
169 {
170 // Other uses dynamic storage
171 SrcStorage=Other.m_Storage.m_dynSet;
172
173 // Check what kind of storage are we using right now
174 if(use_fixed_storage(size: m_Size))
175 {
176 // Using fixed storage, allocate new
177 set_value_type* pTemp=new set_value_type[Other.m_Size];
178 DestStorage=pTemp;
179 m_Storage.m_dynSet=pTemp;
180 m_Size=Other.m_Size;
181 }
182 else
183 {
184 // Using dynamic storage, check if can reuse
185 if(m_Storage.m_dynSet!=0 && m_Size>=Other.m_Size && m_Size<Other.m_Size*2)
186 {
187 // Reuse the current storage
188 DestStorage=m_Storage.m_dynSet;
189 m_Size=Other.m_Size;
190 }
191 else
192 {
193 // Allocate the new one
194 set_value_type* pTemp=new set_value_type[Other.m_Size];
195 DestStorage=pTemp;
196
197 // Delete old storage if necessary
198 if(m_Storage.m_dynSet!=0)
199 {
200 delete [] m_Storage.m_dynSet;
201 }
202 // Store the new storage
203 m_Storage.m_dynSet=pTemp;
204 // Set new size
205 m_Size=Other.m_Size;
206 }
207 }
208 }
209
210 // Copy the data
211 ::std::memcpy(dest: DestStorage, src: SrcStorage, n: sizeof(set_value_type)*m_Size);
212
213 return *this;
214 }
215
216 // Operation
217 template<typename Char2T>
218 bool operator()( Char2T Ch ) const
219 {
220 const set_value_type* Storage=
221 (use_fixed_storage(size: m_Size))
222 ? &m_Storage.m_fixSet[0]
223 : m_Storage.m_dynSet;
224
225 return ::std::binary_search(Storage, Storage+m_Size, Ch);
226 }
227 private:
228 // check if the size is eligible for fixed storage
229 static bool use_fixed_storage(std::size_t size)
230 {
231 return size<=sizeof(set_value_type*)*2;
232 }
233
234
235 private:
236 // storage
237 // The actual used storage is selected on the type
238 union
239 {
240 set_value_type* m_dynSet;
241 set_value_type m_fixSet[sizeof(set_value_type*)*2];
242 }
243 m_Storage;
244
245 // storage size
246 ::std::size_t m_Size;
247 };
248
249 // is_from_range functor
250 /*
251 returns true if the value is from the specified range.
252 (i.e. x>=From && x>=To)
253 */
254 template<typename CharT>
255 struct is_from_rangeF :
256 public predicate_facade< is_from_rangeF<CharT> >
257 {
258 // Boost.ResultOf support
259 typedef bool result_type;
260
261 // Constructor
262 is_from_rangeF( CharT From, CharT To ) : m_From(From), m_To(To) {}
263
264 // Operation
265 template<typename Char2T>
266 bool operator()( Char2T Ch ) const
267 {
268 return ( m_From <= Ch ) && ( Ch <= m_To );
269 }
270
271 private:
272 CharT m_From;
273 CharT m_To;
274 };
275
276 // class_and composition predicate
277 template<typename Pred1T, typename Pred2T>
278 struct pred_andF :
279 public predicate_facade< pred_andF<Pred1T,Pred2T> >
280 {
281 public:
282
283 // Boost.ResultOf support
284 typedef bool result_type;
285
286 // Constructor
287 pred_andF( Pred1T Pred1, Pred2T Pred2 ) :
288 m_Pred1(Pred1), m_Pred2(Pred2) {}
289
290 // Operation
291 template<typename CharT>
292 bool operator()( CharT Ch ) const
293 {
294 return m_Pred1(Ch) && m_Pred2(Ch);
295 }
296
297 private:
298 Pred1T m_Pred1;
299 Pred2T m_Pred2;
300 };
301
302 // class_or composition predicate
303 template<typename Pred1T, typename Pred2T>
304 struct pred_orF :
305 public predicate_facade< pred_orF<Pred1T,Pred2T> >
306 {
307 public:
308 // Boost.ResultOf support
309 typedef bool result_type;
310
311 // Constructor
312 pred_orF( Pred1T Pred1, Pred2T Pred2 ) :
313 m_Pred1(Pred1), m_Pred2(Pred2) {}
314
315 // Operation
316 template<typename CharT>
317 bool operator()( CharT Ch ) const
318 {
319 return m_Pred1(Ch) || m_Pred2(Ch);
320 }
321
322 private:
323 Pred1T m_Pred1;
324 Pred2T m_Pred2;
325 };
326
327 // class_not composition predicate
328 template< typename PredT >
329 struct pred_notF :
330 public predicate_facade< pred_notF<PredT> >
331 {
332 public:
333 // Boost.ResultOf support
334 typedef bool result_type;
335
336 // Constructor
337 pred_notF( PredT Pred ) : m_Pred(Pred) {}
338
339 // Operation
340 template<typename CharT>
341 bool operator()( CharT Ch ) const
342 {
343 return !m_Pred(Ch);
344 }
345
346 private:
347 PredT m_Pred;
348 };
349
350 } // namespace detail
351 } // namespace algorithm
352} // namespace boost
353
354
355#endif // BOOST_STRING_CLASSIFICATION_DETAIL_HPP
356

source code of boost/libs/algorithm/include/boost/algorithm/string/detail/classification.hpp