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1 /**
2  * \file Thesaurus.cpp
3  * This file is part of LyX, the document processor.
4  * Licence details can be found in the file COPYING.
5  *
6  * \author John Levon
7  * \author Jürgen Spitzmüller
8  *
9  * Full author contact details are available in file CREDITS.
10  */
11
12 #include <config.h>
13
14 #include "Thesaurus.h"
15
16 #include "support/debug.h"
17 #include "support/gettext.h"
18 #include "LyXRC.h"
19
20 #include "support/FileNameList.h"
21 #include "support/filetools.h"
22 #include "support/lstrings.h"
23 #include "support/os.h"
24 #include "support/unicode.h"
25
26 #include "frontends/alert.h"
27
28 #ifdef HAVE_LIBMYTHES
29 #include MYTHES_H_LOCATION
30 #else
31 #ifdef HAVE_LIBAIKSAURUS
32 #include AIKSAURUS_H_LOCATION
33 #endif // HAVE_LIBAIKSAURUS
34 #endif // !HAVE_LIBMYTHES
35
36 #include <algorithm>
37 #include <cstring>
38
39 using namespace std;
40 using namespace lyx::support;
41 using namespace lyx::support::os;
42
43 namespace lyx {
44
45 #ifdef HAVE_LIBAIKSAURUS
46
47 struct Thesaurus::Private
48 {
49         Private(): thes_(new Aiksaurus) {}
50         Aiksaurus * thes_;
51 };
52
53 Thesaurus::Meanings Thesaurus::lookup(docstring const & t, docstring const &)
54 {
55         Meanings meanings;
56
57         // aiksaurus is for english text only, therefore it does not work
58         // with non-ascii strings.
59         // The interface of the Thesaurus class uses docstring because a
60         // non-english thesaurus is possible in theory.
61         if (!support::isAscii(t))
62                 // to_ascii() would assert
63                 return meanings;
64
65         string const text = to_ascii(t);
66
67         docstring error = from_ascii(d->thes_->error());
68         if (!error.empty()) {
69                 static bool sent_error = false;
70                 if (!sent_error) {
71                         frontend::Alert::error(_("Thesaurus failure"),
72                                      bformat(_("Aiksaurus returned the following error:\n\n%1$s."),
73                                              error));
74                         sent_error = true;
75                 }
76                 return meanings;
77         }
78         if (!d->thes_->find(text.c_str()))
79                 return meanings;
80
81         // weird api, but ...
82
83         int prev_meaning = -1;
84         int cur_meaning;
85         docstring meaning;
86
87         // correct, returns "" at the end
88         string ret = d->thes_->next(cur_meaning);
89
90         while (!ret.empty()) {
91                 if (cur_meaning != prev_meaning) {
92                         meaning = from_ascii(ret);
93                         ret = d->thes_->next(cur_meaning);
94                         prev_meaning = cur_meaning;
95                 } else {
96                         if (ret != text)
97                                 meanings[meaning].push_back(from_ascii(ret));
98                 }
99
100                 ret = d->thes_->next(cur_meaning);
101         }
102
103         for (Meanings::iterator it = meanings.begin();
104              it != meanings.end(); ++it)
105                 sort(it->second.begin(), it->second.end());
106
107         return meanings;
108 }
109
110
111 bool Thesaurus::thesaurusAvailable(docstring const & lang) const
112 {
113         // we support English only
114         return prefixIs(lang, from_ascii("en_"));
115 }
116
117 #else // HAVE_LIBAIKSAURUS
118 #ifdef HAVE_LIBMYTHES
119
120 namespace {
121
122 string const to_iconv_encoding(docstring const & s, string const & encoding)
123 {
124         std::vector<char> const encoded =
125                 ucs4_to_eightbit(s.data(), s.length(), encoding);
126         return string(encoded.begin(), encoded.end());
127 }
128
129
130 docstring const from_iconv_encoding(string const & s, string const & encoding)
131 {
132         std::vector<char_type> const ucs4 =
133                 eightbit_to_ucs4(s.data(), s.length(), encoding);
134         return docstring(ucs4.begin(), ucs4.end());
135 }
136
137 } // namespace anon
138
139
140 struct Thesaurus::Private
141 {
142         ~Private()
143         {
144                 for (Thesauri::iterator it = thes_.begin();
145                      it != thes_.end(); ++it) {
146                         delete it->second;
147                 }
148         }
149
150         /// add a thesaurus to the list
151         bool addThesaurus(docstring const & lang);
152
153         typedef std::map<docstring, MyThes *> Thesauri;
154         /// the thesauri
155         Thesauri thes_;
156 };
157
158 bool Thesaurus::Private::addThesaurus(docstring const & lang)
159 {
160         string const thes_path = external_path(lyxrc.thesaurusdir_path);
161         LYXERR(Debug::FILES, "thesaurus path: " << thes_path);
162         if (thes_path.empty())
163                 return false;
164
165         if (thesaurusAvailable(lang))
166                 return true;
167
168         FileNameList const idx_files = FileName(thes_path).dirList("idx");
169         FileNameList const data_files = FileName(thes_path).dirList("dat");
170         string idx;
171         string data;
172
173         for (FileNameList::const_iterator it = idx_files.begin();
174              it != idx_files.end(); ++it) {
175                 LYXERR(Debug::FILES, "found thesaurus idx file: " << it->onlyFileName());
176                 if (contains(it->onlyFileName(), to_ascii(lang))) {
177                         idx = it->absFilename();
178                         LYXERR(Debug::FILES, "selected thesaurus idx file: " << idx);
179                         break;
180                         }
181                 }
182
183         for (support::FileNameList::const_iterator it = data_files.begin();
184              it != data_files.end(); ++it) {
185                 LYXERR(Debug::FILES, "found thesaurus data file: " << it->onlyFileName());
186                 if (contains(it->onlyFileName(), to_ascii(lang))) {
187                         data = it->absFilename();
188                         LYXERR(Debug::FILES, "selected thesaurus data file: " << data);
189                         break;
190                         }
191                 }
192
193         if (idx.empty() || data.empty())
194                 return false;
195
196         char const * af = idx.c_str();
197         char const * df = data.c_str();
198         thes_[lang] = new MyThes(af, df);
199         return true;
200 }
201
202
203 bool Thesaurus::thesaurusAvailable(docstring const & lang) const
204 {
205         for (Thesauri::const_iterator it = d->thes_.begin();
206              it != d->thes_.end(); ++it) {
207                 if (it->first == lang)
208                         if (it->second)
209                                 return true;
210         }
211
212         return false;
213 }
214
215
216 Thesaurus::Meanings Thesaurus::lookup(docstring const & t, docstring const & lang)
217 {
218         Meanings meanings;
219         MyThes * mythes = 0;
220
221         if (!d->addThesaurus(lang))
222                 return meanings;
223
224         for (Thesauri::const_iterator it = d->thes_.begin();
225              it != d->thes_.end(); ++it) {
226                 if (it->first == lang) {
227                         mythes = it->second;
228                         break;
229                 }
230         }
231
232         if (!mythes)
233                 return meanings;
234
235         string const encoding = mythes->get_th_encoding();
236         
237         mentry * pmean;
238         string const text = to_iconv_encoding(support::lowercase(t), encoding);
239         int len = strlen(text.c_str());
240         int count = mythes->Lookup(text.c_str(), len, &pmean);
241         if (!count)
242                 return meanings;
243
244         // don't change value of pmean or count
245         // they are needed for the CleanUpAfterLookup routine
246         mentry * pm = pmean;
247         docstring meaning;
248         docstring ret;
249         for (int i = 0; i < count; i++) {
250                 meaning = from_iconv_encoding(string(pm->defn), encoding);
251                 // remove silly item
252                 if (support::prefixIs(meaning, '-'))
253                         meaning = support::ltrim(meaning, "- ");
254                 for (int j = 0; j < pm->count; j++) {
255                         ret = from_iconv_encoding(string(pm->psyns[j]), encoding);
256                 }
257         meanings[meaning].push_back(ret);
258         pm++;
259         }
260         // now clean up all allocated memory
261         mythes->CleanUpAfterLookup(&pmean, count);
262
263         for (Meanings::iterator it = meanings.begin();
264              it != meanings.end(); ++it)
265                 sort(it->second.begin(), it->second.end());
266
267         return meanings;
268 }
269
270 #else
271
272 struct Thesaurus::Private
273 {
274 };
275
276
277 Thesaurus::Meanings Thesaurus::lookup(docstring const &, docstring const &)
278 {
279         return Meanings();
280 }
281
282
283 bool Thesaurus::thesaurusAvailable(docstring const &) const
284 {
285         return false;
286 }
287
288 #endif // HAVE_LIBMYTHES
289 #endif // HAVE_LIBAIKSAURUS
290
291 Thesaurus::Thesaurus() : d(new Thesaurus::Private)
292 {
293 }
294
295
296 Thesaurus::~Thesaurus()
297 {
298         delete d;
299 }
300
301 // Global instance
302 Thesaurus thesaurus;
303
304
305 } // namespace lyx