|
1 /* |
|
2 * Copyright (c) 2002-2005 Nokia Corporation and/or its subsidiary(-ies). |
|
3 * All rights reserved. |
|
4 * This component and the accompanying materials are made available |
|
5 * under the terms of "Eclipse Public License v1.0" |
|
6 * which accompanies this distribution, and is available |
|
7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
8 * |
|
9 * Initial Contributors: |
|
10 * Nokia Corporation - initial contribution. |
|
11 * |
|
12 * Contributors: |
|
13 * |
|
14 * Description: Japanese Find Utilities implementation file. |
|
15 * |
|
16 */ |
|
17 |
|
18 |
|
19 |
|
20 |
|
21 |
|
22 |
|
23 |
|
24 |
|
25 |
|
26 |
|
27 // INCLUDE FILES |
|
28 #include "FindUtilJapanese.h" |
|
29 #include <JPLangUtil.h> |
|
30 |
|
31 // CONSTANTS |
|
32 _LIT(KDesWildCard, "*"); |
|
33 |
|
34 const TInt KLitTab('\t'); |
|
35 const TInt KLitSpace(' '); |
|
36 const TInt KLitHyphen('-'); |
|
37 const TInt KLitQuestion('?'); |
|
38 const TInt KLitWildCard('*'); |
|
39 const TInt KLitFullWidthSpace(0x3000); |
|
40 const TInt KLitFullWidthHyphen(0x2015); |
|
41 const TInt KLitFullWidthQuestion(0xff1f); |
|
42 const TInt KLitFullWidthWildCard(0xff0a); |
|
43 const TInt KLitStartHiragana(0x3041); |
|
44 const TInt KLitEndHiragana(0x3096); |
|
45 const TInt KLitStartKatakana(0x30A1); |
|
46 const TInt KLitLineFeed(8233); |
|
47 |
|
48 const TInt KMaxWordLength = 200; |
|
49 const TUint KFullWidthSpace = 0x3000; |
|
50 |
|
51 // ============================ MEMBER FUNCTIONS =============================== |
|
52 |
|
53 // ----------------------------------------------------------------------------- |
|
54 // CFindUtilJapanese::CFindUtilJapanese |
|
55 // C++ default constructor can NOT contain any code, that |
|
56 // might leave. |
|
57 // ----------------------------------------------------------------------------- |
|
58 // |
|
59 CFindUtilJapanese::CFindUtilJapanese() |
|
60 { |
|
61 } |
|
62 |
|
63 // Destructor |
|
64 CFindUtilJapanese::~CFindUtilJapanese() |
|
65 { |
|
66 } |
|
67 |
|
68 // ----------------------------------------------------------------------------- |
|
69 // CFindUtilJapanese::IsFindWordSeparator |
|
70 // (other items were commented in a header). |
|
71 // ----------------------------------------------------------------------------- |
|
72 // |
|
73 TBool CFindUtilJapanese::IsFindWordSeparator(TChar aCh) |
|
74 { |
|
75 return aCh == KLitSpace || aCh == KLitHyphen || aCh == KLitTab || |
|
76 aCh == KLitFullWidthSpace || aCh == KLitFullWidthHyphen || |
|
77 aCh == KLitLineFeed; |
|
78 } |
|
79 |
|
80 |
|
81 // ----------------------------------------------------------------------------- |
|
82 // CFindUtilJapanese::RemoveWordSeparatorsAndWildChars |
|
83 // (other items were commented in a header). |
|
84 // ----------------------------------------------------------------------------- |
|
85 // |
|
86 void CFindUtilJapanese::RemoveWordSeparatorsAndWildChars( TDes16& aSearchPtr ) |
|
87 { |
|
88 TInt len = aSearchPtr.Length(); |
|
89 |
|
90 for ( TInt ii(0); ii < len; ii++ ) |
|
91 { |
|
92 if ( IsFindWordSeparator(static_cast<TChar>(aSearchPtr[ii])) || |
|
93 aSearchPtr[ii] == KLitWildCard || aSearchPtr[ii] == KLitQuestion || |
|
94 aSearchPtr[ii] == KLitFullWidthWildCard || |
|
95 aSearchPtr[ii] == KLitFullWidthQuestion) |
|
96 { |
|
97 aSearchPtr.Delete(ii, 1); |
|
98 len--; |
|
99 continue; |
|
100 } |
|
101 } |
|
102 |
|
103 } |
|
104 |
|
105 inline TBool IsFindWordSeparator(TChar aCh) |
|
106 { |
|
107 return (aCh == ' '|| aCh == '-' || aCh == '\t' || aCh==KFullWidthSpace); |
|
108 } |
|
109 |
|
110 void ReplaceCharacters(TDes &aDes, const TDesC &aChars, TChar aReplacement) |
|
111 // |
|
112 // Running time O(aDes.Length() * aChars.Length()) |
|
113 // Does not change length of the string. |
|
114 // |
|
115 { |
|
116 TInt src = 0; |
|
117 TInt srclength = aDes.Length(); |
|
118 while(src < srclength) |
|
119 { |
|
120 TChar c = aDes[src]; |
|
121 if (aChars.LocateF(c) != KErrNotFound) |
|
122 aDes[src] = TUint16(aReplacement); |
|
123 ++src; |
|
124 } |
|
125 } |
|
126 |
|
127 |
|
128 // ----------------------------------------------------------------------------- |
|
129 // CFindUtilJapanese::MyFindC |
|
130 // (other items were commented in a header). |
|
131 // This method is called by MatchRefineL(). |
|
132 // ----------------------------------------------------------------------------- |
|
133 // |
|
134 TInt CFindUtilJapanese::MyFindC(const TDesC &aItemString, const TDesC &aSearchText) |
|
135 { |
|
136 TBuf<KMaxWordLength> searchText; |
|
137 TBuf<KMaxWordLength> itemString; |
|
138 searchText.Append(aSearchText); |
|
139 // The replacecharacters are to disable regexp matching provided |
|
140 // by MatchC(). |
|
141 _LIT(KQuestion,"?"); |
|
142 _LIT(KStar,"*"); |
|
143 ReplaceCharacters(searchText, KQuestion, TChar('\t')); |
|
144 ReplaceCharacters(searchText, KStar, TChar('\r')); |
|
145 searchText.Append(KStar); |
|
146 if (aItemString.Length() < KMaxWordLength) |
|
147 { |
|
148 itemString.Append(aItemString); |
|
149 } |
|
150 else |
|
151 { |
|
152 itemString.Append(aItemString.Left(KMaxWordLength)); |
|
153 } |
|
154 ReplaceCharacters(itemString, KQuestion, TChar('\t')); |
|
155 ReplaceCharacters(itemString, KStar, TChar('\r')); |
|
156 |
|
157 CnvKatakana(searchText); |
|
158 CnvKatakana(itemString); |
|
159 |
|
160 TInt length = itemString.Length(); |
|
161 for(int i=0;i<length;i++) |
|
162 { |
|
163 if (i==0 || IsFindWordSeparator(aItemString[i-1])) |
|
164 { |
|
165 if (itemString.Mid(i).MatchC(searchText) != KErrNotFound) |
|
166 { |
|
167 return i; |
|
168 } |
|
169 } |
|
170 } |
|
171 return KErrNotFound; |
|
172 } |
|
173 |
|
174 // ----------------------------------------------------------------------------- |
|
175 // CFindUtilJapanese::IsMatch |
|
176 // (other items were commented in a header). |
|
177 // This method is called by MatchRefineL(). |
|
178 // This method separates by 4 characters, and this method calls MyFindC(). |
|
179 // ----------------------------------------------------------------------------- |
|
180 // |
|
181 TBool CFindUtilJapanese::IsMatch( const TDesC& aItemString, const TDesC& aSearchText) |
|
182 { |
|
183 TPtrC itemptr(aItemString); |
|
184 TPtrC searchptr(aSearchText); |
|
185 |
|
186 TBool match = EFalse; |
|
187 |
|
188 FOREVER |
|
189 { |
|
190 // Loop invariant: itemptr is next character from ' ' or '-' |
|
191 // Loop invariant: seachptr is at beginning of searched item |
|
192 TInt val = MyFindC(itemptr,searchptr); |
|
193 if (val == 0) |
|
194 { |
|
195 match = ETrue; |
|
196 break; |
|
197 } |
|
198 if (val != KErrNotFound && IsFindWordSeparator(itemptr[val-1])) |
|
199 { |
|
200 match = ETrue; |
|
201 break; |
|
202 } |
|
203 |
|
204 // find the word separator characters from list item |
|
205 const TInt maxFindChar = 4; |
|
206 TChar findchar = KFullWidthSpace; |
|
207 TInt findindex; |
|
208 for (findindex=0; findindex < maxFindChar; findindex++) |
|
209 { |
|
210 switch(findindex) |
|
211 { |
|
212 case 0: findchar = (' '); break; // space |
|
213 case 1: findchar = KFullWidthSpace; break; // full space |
|
214 case 2: findchar = ('-'); break; // minus |
|
215 case 3: findchar = ('\t'); break; // tab |
|
216 } |
|
217 const TInt findpos = itemptr.LocateF(findchar); |
|
218 if (findpos != KErrNotFound) |
|
219 { |
|
220 itemptr.Set(itemptr.Mid(findpos+1)); |
|
221 break; |
|
222 } |
|
223 } |
|
224 if (findindex >= maxFindChar) |
|
225 { |
|
226 match = EFalse; |
|
227 break; |
|
228 } |
|
229 if (itemptr.Length() == 0) |
|
230 { |
|
231 match = EFalse; |
|
232 break; |
|
233 } |
|
234 } |
|
235 return match; |
|
236 } |
|
237 |
|
238 // ----------------------------------------------------------------------------- |
|
239 // CFindUtilJapanese::CnvKatakana |
|
240 // (other items were commented in a header). |
|
241 // ----------------------------------------------------------------------------- |
|
242 // |
|
243 void CFindUtilJapanese::CnvKatakana(TDes& aDes) |
|
244 { |
|
245 TInt len = aDes.Length(); |
|
246 for (TInt i(0); i < len; i++) |
|
247 { |
|
248 TUint16& ch = aDes[i]; |
|
249 if (ch >= KLitStartHiragana && ch <= KLitEndHiragana) |
|
250 { |
|
251 ch += (KLitStartKatakana - KLitStartHiragana); |
|
252 } |
|
253 } |
|
254 } |
|
255 |
|
256 // ----------------------------------------------------------------------------- |
|
257 // CFindUtilJapanese::Match |
|
258 // (other items were commented in a header). |
|
259 // ----------------------------------------------------------------------------- |
|
260 // |
|
261 |
|
262 TBool CFindUtilJapanese::Match(const TDesC& aContactsField, const TDesC& aWord) |
|
263 { |
|
264 if (!aContactsField.Length()) |
|
265 { |
|
266 return EFalse; |
|
267 } |
|
268 |
|
269 TBuf<KMaxWordLength> searchText(aWord); |
|
270 TBuf<KMaxWordLength> itemString(aContactsField); |
|
271 |
|
272 searchText.Append(KDesWildCard); |
|
273 CnvKatakana(searchText); |
|
274 CnvKatakana(itemString); |
|
275 |
|
276 if (itemString.MatchC(searchText) != KErrNotFound) |
|
277 { |
|
278 return ETrue; |
|
279 } |
|
280 |
|
281 return EFalse; |
|
282 } |
|
283 |
|
284 // ----------------------------------------------------------------------------- |
|
285 // CFindUtilJapanese::MatchRefineL |
|
286 // (other items were commented in a header). |
|
287 // ----------------------------------------------------------------------------- |
|
288 // |
|
289 TBool CFindUtilJapanese::MatchRefineL( const TDesC& aItemString, const TDesC &aSearchText) |
|
290 { |
|
291 if ( aItemString.Length() == 0 ) |
|
292 { |
|
293 return EFalse; |
|
294 } |
|
295 |
|
296 if ( aSearchText.Length() == 0 ) |
|
297 { |
|
298 return ETrue; |
|
299 } |
|
300 |
|
301 return IsMatch(aItemString, aSearchText); |
|
302 } |
|
303 |
|
304 // ----------------------------------------------------------------------------- |
|
305 // CFindUtilJapanese::IsWordValidForMatching |
|
306 // (other items were commented in a header). |
|
307 // ----------------------------------------------------------------------------- |
|
308 // |
|
309 TBool CFindUtilJapanese::IsWordValidForMatching(const TDesC& /*aWord*/) |
|
310 { |
|
311 return ETrue; |
|
312 } |
|
313 |
|
314 |
|
315 // ----------------------------------------------------------------------------- |
|
316 // CFindUtilJapanese::MatchAdaptiveRefineL |
|
317 // (other items were commented in a header). |
|
318 // ----------------------------------------------------------------------------- |
|
319 // |
|
320 TBool CFindUtilJapanese::MatchAdaptiveRefineL( const TDesC& /*aItemString*/, |
|
321 const TDesC& /*aSearchText*/, |
|
322 HBufC*& /*aNextChars*/ ) |
|
323 { |
|
324 return EFalse; |
|
325 } |
|
326 |
|
327 // --------------------------------------------------------- |
|
328 // Match arithmetic for accurate search, special conversion |
|
329 // for aItemString is implemented with MFindStringConverter |
|
330 // before the final match |
|
331 // --------------------------------------------------------- |
|
332 // |
|
333 TBool CFindUtilJapanese::MatchRefineL( const TDesC& /*aItemString*/, const TDesC& /*aSearchText*/, |
|
334 TMatchPolicy /*aPolicy*/, MFindStringConverter* /*aConverter*/) |
|
335 { |
|
336 return EFalse; |
|
337 } |
|
338 |
|
339 // ========================== OTHER EXPORTED FUNCTIONS ========================= |
|
340 |
|
341 // ----------------------------------------------------------------------------- |
|
342 // FindUtilFactoryFunctionL |
|
343 // Factory function at first ordinal |
|
344 // Returns: MFindUtil: It returns MFindUtil I/F. |
|
345 // ----------------------------------------------------------------------------- |
|
346 // |
|
347 EXPORT_C MFindUtil* FindUtilFactoryFunctionL() |
|
348 { |
|
349 return new( ELeave ) CFindUtilJapanese(); |
|
350 } |
|
351 |
|
352 // End of File |