1 | /* -*- C++ -*- |
---|
2 | * lemon/bits/item_reader.h - Part of LEMON, a generic C++ optimization library |
---|
3 | * |
---|
4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
---|
5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
---|
6 | * |
---|
7 | * Permission to use, modify and distribute this software is granted |
---|
8 | * provided that this copyright notice appears in all copies. For |
---|
9 | * precise terms see the accompanying LICENSE file. |
---|
10 | * |
---|
11 | * This software is provided "AS IS" with no warranty of any kind, |
---|
12 | * express or implied, and with no claim as to its suitability for any |
---|
13 | * purpose. |
---|
14 | * |
---|
15 | */ |
---|
16 | |
---|
17 | /// @defgroup item_io Item Readers and Writers |
---|
18 | /// @ingroup io_group |
---|
19 | /// \brief Item Readers and Writers |
---|
20 | /// |
---|
21 | /// The Input-Output classes can handle more data type by example |
---|
22 | /// as map or attribute value. Each of these should be written and |
---|
23 | /// read some way. The module make possible to do this. |
---|
24 | |
---|
25 | /// \ingroup item_io |
---|
26 | /// \file |
---|
27 | /// \brief Item reader bits for lemon input. |
---|
28 | |
---|
29 | #ifndef LEMON_BITS_ITEM_READER_H |
---|
30 | #define LEMON_BITS_ITEM_READER_H |
---|
31 | |
---|
32 | #include <iostream> |
---|
33 | #include <string> |
---|
34 | |
---|
35 | #include <vector> |
---|
36 | #include <deque> |
---|
37 | #include <list> |
---|
38 | #include <set> |
---|
39 | |
---|
40 | namespace lemon { |
---|
41 | |
---|
42 | template <typename Value> |
---|
43 | class DefaultReader; |
---|
44 | |
---|
45 | /// \ingroup item_io |
---|
46 | /// |
---|
47 | /// \brief Reader class for quoted strings. |
---|
48 | /// |
---|
49 | /// Reader class for quoted strings. It can process the escape |
---|
50 | /// sequences in the string. |
---|
51 | /// |
---|
52 | /// \author Balazs Dezso |
---|
53 | class QuotedStringReader { |
---|
54 | public: |
---|
55 | /// \brief The value type of reader. |
---|
56 | /// |
---|
57 | /// The value type of reader. |
---|
58 | typedef std::string Value; |
---|
59 | |
---|
60 | /// \brief Constructor for the reader. |
---|
61 | /// |
---|
62 | /// Constructor for the reader. If the given parameter is true |
---|
63 | /// the reader processes the escape sequences. |
---|
64 | QuotedStringReader(bool _escaped = true) |
---|
65 | : escaped(_escaped) {} |
---|
66 | |
---|
67 | /// \brief Reads a quoted string from the given stream. |
---|
68 | /// |
---|
69 | /// Reads a quoted string from the given stream. |
---|
70 | void read(std::istream& is, std::string& value) const { |
---|
71 | char c; |
---|
72 | value.clear(); |
---|
73 | is >> std::ws; |
---|
74 | if (!is.get(c) || c != '\"') |
---|
75 | throw DataFormatError("Quoted string format error"); |
---|
76 | while (is.get(c) && c != '\"') { |
---|
77 | if (escaped && c == '\\') { |
---|
78 | value += readEscape(is); |
---|
79 | } else { |
---|
80 | value += c; |
---|
81 | } |
---|
82 | } |
---|
83 | if (!is) throw DataFormatError("Quoted string format error"); |
---|
84 | } |
---|
85 | |
---|
86 | private: |
---|
87 | |
---|
88 | static char readEscape(std::istream& is) { |
---|
89 | char c; |
---|
90 | switch (is.get(c), c) { |
---|
91 | case '\\': |
---|
92 | return '\\'; |
---|
93 | case '\"': |
---|
94 | return '\"'; |
---|
95 | case '\'': |
---|
96 | return '\''; |
---|
97 | case '\?': |
---|
98 | return '\?'; |
---|
99 | case 'a': |
---|
100 | return '\a'; |
---|
101 | case 'b': |
---|
102 | return '\b'; |
---|
103 | case 'f': |
---|
104 | return '\f'; |
---|
105 | case 'n': |
---|
106 | return '\n'; |
---|
107 | case 'r': |
---|
108 | return '\r'; |
---|
109 | case 't': |
---|
110 | return '\t'; |
---|
111 | case 'v': |
---|
112 | return '\v'; |
---|
113 | case 'x': |
---|
114 | { |
---|
115 | int code; |
---|
116 | if (!is.get(c) || !isHex(c)) |
---|
117 | throw DataFormatError("Escape format error"); |
---|
118 | else if (code = valueHex(c), !is.get(c) || !isHex(c)) is.putback(c); |
---|
119 | else code = code * 16 + valueHex(c); |
---|
120 | return code; |
---|
121 | } |
---|
122 | default: |
---|
123 | { |
---|
124 | int code; |
---|
125 | if (!isOct(c)) |
---|
126 | throw DataFormatError("Escape format error"); |
---|
127 | else if (code = valueOct(c), !is.get(c) || !isOct(c)) |
---|
128 | is.putback(c); |
---|
129 | else if (code = code * 8 + valueOct(c), !is.get(c) || !isOct(c)) |
---|
130 | is.putback(c); |
---|
131 | else code = code * 8 + valueOct(c); |
---|
132 | return code; |
---|
133 | } |
---|
134 | } |
---|
135 | } |
---|
136 | |
---|
137 | static bool isOct(char c) { |
---|
138 | return '0' <= c && c <='7'; |
---|
139 | } |
---|
140 | |
---|
141 | static int valueOct(char c) { |
---|
142 | return c - '0'; |
---|
143 | } |
---|
144 | |
---|
145 | static bool isHex(char c) { |
---|
146 | return ('0' <= c && c <= '9') || |
---|
147 | ('a' <= c && c <= 'z') || |
---|
148 | ('A' <= c && c <= 'Z'); |
---|
149 | } |
---|
150 | |
---|
151 | static int valueHex(char c) { |
---|
152 | if ('0' <= c && c <= '9') return c - '0'; |
---|
153 | if ('a' <= c && c <= 'z') return c - 'a' + 10; |
---|
154 | return c - 'A' + 10; |
---|
155 | } |
---|
156 | |
---|
157 | bool escaped; |
---|
158 | }; |
---|
159 | |
---|
160 | /// \ingroup item_io |
---|
161 | /// \brief Reader for standard containers. |
---|
162 | /// |
---|
163 | /// Reader for back insertable standard containers. The representation |
---|
164 | /// of the container is the values enumerated between an open and a |
---|
165 | /// close parse. |
---|
166 | /// |
---|
167 | /// \author Balazs Dezso |
---|
168 | template < |
---|
169 | typename _Container, |
---|
170 | typename _ItemReader = DefaultReader<typename _Container::value_type> |
---|
171 | > |
---|
172 | class PushBackReader { |
---|
173 | public: |
---|
174 | typedef _Container Value; |
---|
175 | typedef _ItemReader ItemReader; |
---|
176 | |
---|
177 | private: |
---|
178 | |
---|
179 | ItemReader item_reader; |
---|
180 | |
---|
181 | public: |
---|
182 | |
---|
183 | /// \brief Reads the values into the container from the given stream. |
---|
184 | /// |
---|
185 | /// Reads the values into the container from the given stream. |
---|
186 | void read(std::istream& is, Value& value) const { |
---|
187 | char c; |
---|
188 | if (!(is >> c) || c != '(') |
---|
189 | throw DataFormatError("PushBackReader format error"); |
---|
190 | while (is >> c && c != ')') { |
---|
191 | is.putback(c); |
---|
192 | typename ItemReader::Value item; |
---|
193 | item_reader.read(is, item); |
---|
194 | value.push_back(item); |
---|
195 | } |
---|
196 | if (!is) throw DataFormatError("PushBackReader format error"); |
---|
197 | is.putback(c); |
---|
198 | } |
---|
199 | |
---|
200 | }; |
---|
201 | |
---|
202 | /// \ingroup item_io |
---|
203 | /// |
---|
204 | /// \brief Reader for standard containers. |
---|
205 | /// |
---|
206 | /// Reader for insertable standard containers. The representation |
---|
207 | /// of the container is the values enumerated between an open and a |
---|
208 | /// close parse. |
---|
209 | /// |
---|
210 | /// \author Balazs Dezso |
---|
211 | template < |
---|
212 | typename _Container, |
---|
213 | typename _ItemReader = DefaultReader<typename _Container::value_type> |
---|
214 | > |
---|
215 | class InsertReader { |
---|
216 | public: |
---|
217 | typedef _Container Value; |
---|
218 | typedef _ItemReader ItemReader; |
---|
219 | |
---|
220 | private: |
---|
221 | |
---|
222 | ItemReader item_reader; |
---|
223 | |
---|
224 | public: |
---|
225 | |
---|
226 | /// \brief Reads the values into the container from the given stream. |
---|
227 | /// |
---|
228 | /// Reads the values into the container from the given stream. |
---|
229 | void read(std::istream& is, Value& value) const { |
---|
230 | char c; |
---|
231 | if (!(is >> c) || c != '(') |
---|
232 | throw DataFormatError("InsertReader format error"); |
---|
233 | while (is >> c && c != ')') { |
---|
234 | is.putback(c); |
---|
235 | typename ItemReader::Value item; |
---|
236 | item_reader.read(is, item); |
---|
237 | value.insert(item); |
---|
238 | } |
---|
239 | if (!is) throw DataFormatError("PushBackReader format error"); |
---|
240 | is.putback(c); |
---|
241 | } |
---|
242 | |
---|
243 | }; |
---|
244 | |
---|
245 | /// \ingroup item_io |
---|
246 | /// \brief Reader for parsed string. |
---|
247 | /// |
---|
248 | /// Reader for parsed strings. You can define the open and close |
---|
249 | /// parse characters. It reads from the input a character sequence |
---|
250 | /// which is right parsed. |
---|
251 | /// |
---|
252 | /// \author Balazs Dezso |
---|
253 | class ParsedStringReader { |
---|
254 | public: |
---|
255 | typedef std::string Value; |
---|
256 | |
---|
257 | /// \brief Constructor. |
---|
258 | /// |
---|
259 | /// Constructor for ParsedStringReader. You can give as parameter |
---|
260 | /// the open and close parse characters. |
---|
261 | ParsedStringReader(char _open = '(', char _close = ')') |
---|
262 | : open(_open), close(_close) {} |
---|
263 | |
---|
264 | |
---|
265 | /// \brief Reads the parsed string from the given stream. |
---|
266 | /// |
---|
267 | /// Reads the parsed string from the given stream. |
---|
268 | void read(std::istream& is, Value& value) const { |
---|
269 | char c; |
---|
270 | if (!(is >> c) || c != open) { |
---|
271 | throw DataFormatError("ParsedStringReader format error"); |
---|
272 | } |
---|
273 | value += c; |
---|
274 | int counter = 1; |
---|
275 | while (counter > 0 && is >> c) { |
---|
276 | if (c == close) { |
---|
277 | --counter; |
---|
278 | } else if (c == open) { |
---|
279 | ++counter; |
---|
280 | } |
---|
281 | value += c; |
---|
282 | } |
---|
283 | if (!is) { |
---|
284 | throw DataFormatError("ParsedStrinReader format error"); |
---|
285 | } |
---|
286 | } |
---|
287 | |
---|
288 | private: |
---|
289 | char open, close; |
---|
290 | |
---|
291 | }; |
---|
292 | |
---|
293 | /// \ingroup item_io |
---|
294 | /// \brief Reader for read the whole line. |
---|
295 | /// |
---|
296 | /// Reader for read the whole line. |
---|
297 | /// |
---|
298 | /// \author Balazs Dezso |
---|
299 | class LineReader { |
---|
300 | public: |
---|
301 | typedef std::string Value; |
---|
302 | |
---|
303 | /// \brief Constructor. |
---|
304 | /// |
---|
305 | /// Constructor for the LineReader. If the given parameter is |
---|
306 | /// true then the spaces before the first not space character are |
---|
307 | /// skipped. |
---|
308 | LineReader(bool _skipSpaces = true) : skipSpaces(_skipSpaces) {} |
---|
309 | |
---|
310 | /// \brief Reads the line from the given stream. |
---|
311 | /// |
---|
312 | /// Reads the line from the given stream. |
---|
313 | void read(std::istream& is, Value& value) { |
---|
314 | if (skipSpaces) is >> std::ws; |
---|
315 | if (!getline(is, value)) { |
---|
316 | throw DataFormatError("LineReader forma error"); |
---|
317 | } |
---|
318 | } |
---|
319 | private: |
---|
320 | bool skipSpaces; |
---|
321 | }; |
---|
322 | |
---|
323 | /// \ingroup item_io |
---|
324 | /// |
---|
325 | /// \brief The default item reader template class. |
---|
326 | /// |
---|
327 | /// The default item reader template class. If some section reader |
---|
328 | /// needs to read a value from a stream it will give the default way for it. |
---|
329 | /// |
---|
330 | /// \author Balazs Dezso |
---|
331 | template <typename _Value> |
---|
332 | class DefaultReader { |
---|
333 | public: |
---|
334 | /// The value type. |
---|
335 | typedef _Value Value; |
---|
336 | /// \brief Reads a value from the given stream. |
---|
337 | /// |
---|
338 | /// Reads a value from the given stream. |
---|
339 | void read(std::istream& is, Value& value) const { |
---|
340 | if (!(is >> value)) |
---|
341 | throw DataFormatError("DefaultReader format error"); |
---|
342 | } |
---|
343 | }; |
---|
344 | |
---|
345 | template <> |
---|
346 | class DefaultReader<std::string> { |
---|
347 | public: |
---|
348 | typedef std::string Value; |
---|
349 | |
---|
350 | void read(std::istream& is, Value& value) const { |
---|
351 | char c; |
---|
352 | if (!(is >> std::ws >> c)) return; |
---|
353 | is.putback(c); |
---|
354 | switch (c) { |
---|
355 | case '\"': |
---|
356 | QuotedStringReader().read(is, value); |
---|
357 | break; |
---|
358 | case '(': |
---|
359 | ParsedStringReader().read(is, value); |
---|
360 | break; |
---|
361 | case '[': |
---|
362 | ParsedStringReader('[', ']').read(is, value); |
---|
363 | break; |
---|
364 | case '/': |
---|
365 | ParsedStringReader('/', '/').read(is, value); |
---|
366 | break; |
---|
367 | default: |
---|
368 | if (!(is >> value)) |
---|
369 | throw DataFormatError("DefaultReader format error"); |
---|
370 | break; |
---|
371 | } |
---|
372 | } |
---|
373 | |
---|
374 | }; |
---|
375 | |
---|
376 | template <typename Item> |
---|
377 | class DefaultReader<std::vector<Item> > |
---|
378 | : public PushBackReader<std::vector<Item> > {}; |
---|
379 | |
---|
380 | template <typename Item> |
---|
381 | class DefaultReader<std::deque<Item> > |
---|
382 | : public PushBackReader<std::deque<Item> > {}; |
---|
383 | |
---|
384 | template <typename Item> |
---|
385 | class DefaultReader<std::list<Item> > |
---|
386 | : public PushBackReader<std::list<Item> > {}; |
---|
387 | |
---|
388 | template <typename Item> |
---|
389 | class DefaultReader<std::set<Item> > |
---|
390 | : public InsertReader<std::set<Item> > {}; |
---|
391 | |
---|
392 | template <typename Item> |
---|
393 | class DefaultReader<std::multiset<Item> > |
---|
394 | : public InsertReader<std::multiset<Item> > {}; |
---|
395 | |
---|
396 | /// \ingroup item_io |
---|
397 | /// |
---|
398 | /// \brief The default item reader for skipping a value in the stream. |
---|
399 | /// |
---|
400 | /// The default item reader for skipping a value in the stream. |
---|
401 | /// |
---|
402 | /// \author Balazs Dezso |
---|
403 | class DefaultSkipper : public DefaultReader<std::string> {}; |
---|
404 | |
---|
405 | /// \ingroup item_io |
---|
406 | /// \brief Standard ReaderTraits for the GraphReader class. |
---|
407 | /// |
---|
408 | /// Standard ReaderTraits for the GraphReader class. |
---|
409 | /// It defines standard reading method for all type of value. |
---|
410 | /// \author Balazs Dezso |
---|
411 | struct DefaultReaderTraits { |
---|
412 | |
---|
413 | template <typename _Value> |
---|
414 | struct Reader : DefaultReader<_Value> {}; |
---|
415 | |
---|
416 | typedef DefaultSkipper Skipper; |
---|
417 | |
---|
418 | }; |
---|
419 | |
---|
420 | } |
---|
421 | |
---|
422 | #endif |
---|