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comparison: intl/icu/source/common/unicode/ucasemap.h

intl/icu/source/common/unicode/ucasemap.h

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1 /*
2 *******************************************************************************
3 *
4 * Copyright (C) 2005-2012, International Business Machines
5 * Corporation and others. All Rights Reserved.
6 *
7 *******************************************************************************
8 * file name: ucasemap.h
9 * encoding: US-ASCII
10 * tab size: 8 (not used)
11 * indentation:4
12 *
13 * created on: 2005may06
14 * created by: Markus W. Scherer
15 *
16 * Case mapping service object and functions using it.
17 */
18
19 #ifndef __UCASEMAP_H__
20 #define __UCASEMAP_H__
21
22 #include "unicode/utypes.h"
23 #include "unicode/ustring.h"
24 #include "unicode/localpointer.h"
25
26 /**
27 * \file
28 * \brief C API: Unicode case mapping functions using a UCaseMap service object.
29 *
30 * The service object takes care of memory allocations, data loading, and setup
31 * for the attributes, as usual.
32 *
33 * Currently, the functionality provided here does not overlap with uchar.h
34 * and ustring.h, except for ucasemap_toTitle().
35 *
36 * ucasemap_utf8XYZ() functions operate directly on UTF-8 strings.
37 */
38
39 /**
40 * UCaseMap is an opaque service object for newer ICU case mapping functions.
41 * Older functions did not use a service object.
42 * @stable ICU 3.4
43 */
44 struct UCaseMap;
45 typedef struct UCaseMap UCaseMap; /**< C typedef for struct UCaseMap. @stable ICU 3.4 */
46
47 /**
48 * Open a UCaseMap service object for a locale and a set of options.
49 * The locale ID and options are preprocessed so that functions using the
50 * service object need not process them in each call.
51 *
52 * @param locale ICU locale ID, used for language-dependent
53 * upper-/lower-/title-casing according to the Unicode standard.
54 * Usual semantics: ""=root, NULL=default locale, etc.
55 * @param options Options bit set, used for case folding and string comparisons.
56 * Same flags as for u_foldCase(), u_strFoldCase(),
57 * u_strCaseCompare(), etc.
58 * Use 0 or U_FOLD_CASE_DEFAULT for default behavior.
59 * @param pErrorCode Must be a valid pointer to an error code value,
60 * which must not indicate a failure before the function call.
61 * @return Pointer to a UCaseMap service object, if successful.
62 *
63 * @see U_FOLD_CASE_DEFAULT
64 * @see U_FOLD_CASE_EXCLUDE_SPECIAL_I
65 * @see U_TITLECASE_NO_LOWERCASE
66 * @see U_TITLECASE_NO_BREAK_ADJUSTMENT
67 * @stable ICU 3.4
68 */
69 U_STABLE UCaseMap * U_EXPORT2
70 ucasemap_open(const char *locale, uint32_t options, UErrorCode *pErrorCode);
71
72 /**
73 * Close a UCaseMap service object.
74 * @param csm Object to be closed.
75 * @stable ICU 3.4
76 */
77 U_STABLE void U_EXPORT2
78 ucasemap_close(UCaseMap *csm);
79
80 #if U_SHOW_CPLUSPLUS_API
81
82 U_NAMESPACE_BEGIN
83
84 /**
85 * \class LocalUCaseMapPointer
86 * "Smart pointer" class, closes a UCaseMap via ucasemap_close().
87 * For most methods see the LocalPointerBase base class.
88 *
89 * @see LocalPointerBase
90 * @see LocalPointer
91 * @stable ICU 4.4
92 */
93 U_DEFINE_LOCAL_OPEN_POINTER(LocalUCaseMapPointer, UCaseMap, ucasemap_close);
94
95 U_NAMESPACE_END
96
97 #endif
98
99 /**
100 * Get the locale ID that is used for language-dependent case mappings.
101 * @param csm UCaseMap service object.
102 * @return locale ID
103 * @stable ICU 3.4
104 */
105 U_STABLE const char * U_EXPORT2
106 ucasemap_getLocale(const UCaseMap *csm);
107
108 /**
109 * Get the options bit set that is used for case folding and string comparisons.
110 * @param csm UCaseMap service object.
111 * @return options bit set
112 * @stable ICU 3.4
113 */
114 U_STABLE uint32_t U_EXPORT2
115 ucasemap_getOptions(const UCaseMap *csm);
116
117 /**
118 * Set the locale ID that is used for language-dependent case mappings.
119 *
120 * @param csm UCaseMap service object.
121 * @param locale Locale ID, see ucasemap_open().
122 * @param pErrorCode Must be a valid pointer to an error code value,
123 * which must not indicate a failure before the function call.
124 *
125 * @see ucasemap_open
126 * @stable ICU 3.4
127 */
128 U_STABLE void U_EXPORT2
129 ucasemap_setLocale(UCaseMap *csm, const char *locale, UErrorCode *pErrorCode);
130
131 /**
132 * Set the options bit set that is used for case folding and string comparisons.
133 *
134 * @param csm UCaseMap service object.
135 * @param options Options bit set, see ucasemap_open().
136 * @param pErrorCode Must be a valid pointer to an error code value,
137 * which must not indicate a failure before the function call.
138 *
139 * @see ucasemap_open
140 * @stable ICU 3.4
141 */
142 U_STABLE void U_EXPORT2
143 ucasemap_setOptions(UCaseMap *csm, uint32_t options, UErrorCode *pErrorCode);
144
145 /**
146 * Do not lowercase non-initial parts of words when titlecasing.
147 * Option bit for titlecasing APIs that take an options bit set.
148 *
149 * By default, titlecasing will titlecase the first cased character
150 * of a word and lowercase all other characters.
151 * With this option, the other characters will not be modified.
152 *
153 * @see ucasemap_setOptions
154 * @see ucasemap_toTitle
155 * @see ucasemap_utf8ToTitle
156 * @see UnicodeString::toTitle
157 * @stable ICU 3.8
158 */
159 #define U_TITLECASE_NO_LOWERCASE 0x100
160
161 /**
162 * Do not adjust the titlecasing indexes from BreakIterator::next() indexes;
163 * titlecase exactly the characters at breaks from the iterator.
164 * Option bit for titlecasing APIs that take an options bit set.
165 *
166 * By default, titlecasing will take each break iterator index,
167 * adjust it by looking for the next cased character, and titlecase that one.
168 * Other characters are lowercased.
169 *
170 * This follows Unicode 4 & 5 section 3.13 Default Case Operations:
171 *
172 * R3 toTitlecase(X): Find the word boundaries based on Unicode Standard Annex
173 * #29, "Text Boundaries." Between each pair of word boundaries, find the first
174 * cased character F. If F exists, map F to default_title(F); then map each
175 * subsequent character C to default_lower(C).
176 *
177 * @see ucasemap_setOptions
178 * @see ucasemap_toTitle
179 * @see ucasemap_utf8ToTitle
180 * @see UnicodeString::toTitle
181 * @see U_TITLECASE_NO_LOWERCASE
182 * @stable ICU 3.8
183 */
184 #define U_TITLECASE_NO_BREAK_ADJUSTMENT 0x200
185
186 #if !UCONFIG_NO_BREAK_ITERATION
187
188 /**
189 * Get the break iterator that is used for titlecasing.
190 * Do not modify the returned break iterator.
191 * @param csm UCaseMap service object.
192 * @return titlecasing break iterator
193 * @stable ICU 3.8
194 */
195 U_STABLE const UBreakIterator * U_EXPORT2
196 ucasemap_getBreakIterator(const UCaseMap *csm);
197
198 /**
199 * Set the break iterator that is used for titlecasing.
200 * The UCaseMap service object releases a previously set break iterator
201 * and "adopts" this new one, taking ownership of it.
202 * It will be released in a subsequent call to ucasemap_setBreakIterator()
203 * or ucasemap_close().
204 *
205 * Break iterator operations are not thread-safe. Therefore, titlecasing
206 * functions use non-const UCaseMap objects. It is not possible to titlecase
207 * strings concurrently using the same UCaseMap.
208 *
209 * @param csm UCaseMap service object.
210 * @param iterToAdopt Break iterator to be adopted for titlecasing.
211 * @param pErrorCode Must be a valid pointer to an error code value,
212 * which must not indicate a failure before the function call.
213 *
214 * @see ucasemap_toTitle
215 * @see ucasemap_utf8ToTitle
216 * @stable ICU 3.8
217 */
218 U_STABLE void U_EXPORT2
219 ucasemap_setBreakIterator(UCaseMap *csm, UBreakIterator *iterToAdopt, UErrorCode *pErrorCode);
220
221 /**
222 * Titlecase a UTF-16 string. This function is almost a duplicate of u_strToTitle(),
223 * except that it takes ucasemap_setOptions() into account and has performance
224 * advantages from being able to use a UCaseMap object for multiple case mapping
225 * operations, saving setup time.
226 *
227 * Casing is locale-dependent and context-sensitive.
228 * Titlecasing uses a break iterator to find the first characters of words
229 * that are to be titlecased. It titlecases those characters and lowercases
230 * all others. (This can be modified with ucasemap_setOptions().)
231 *
232 * Note: This function takes a non-const UCaseMap pointer because it will
233 * open a default break iterator if no break iterator was set yet,
234 * and effectively call ucasemap_setBreakIterator();
235 * also because the break iterator is stateful and will be modified during
236 * the iteration.
237 *
238 * The titlecase break iterator can be provided to customize for arbitrary
239 * styles, using rules and dictionaries beyond the standard iterators.
240 * The standard titlecase iterator for the root locale implements the
241 * algorithm of Unicode TR 21.
242 *
243 * This function uses only the setUText(), first(), next() and close() methods of the
244 * provided break iterator.
245 *
246 * The result may be longer or shorter than the original.
247 * The source string and the destination buffer must not overlap.
248 *
249 * @param csm UCaseMap service object. This pointer is non-const!
250 * See the note above for details.
251 * @param dest A buffer for the result string. The result will be NUL-terminated if
252 * the buffer is large enough.
253 * The contents is undefined in case of failure.
254 * @param destCapacity The size of the buffer (number of bytes). If it is 0, then
255 * dest may be NULL and the function will only return the length of the result
256 * without writing any of the result string.
257 * @param src The original string.
258 * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
259 * @param pErrorCode Must be a valid pointer to an error code value,
260 * which must not indicate a failure before the function call.
261 * @return The length of the result string, if successful - or in case of a buffer overflow,
262 * in which case it will be greater than destCapacity.
263 *
264 * @see u_strToTitle
265 * @stable ICU 3.8
266 */
267 U_STABLE int32_t U_EXPORT2
268 ucasemap_toTitle(UCaseMap *csm,
269 UChar *dest, int32_t destCapacity,
270 const UChar *src, int32_t srcLength,
271 UErrorCode *pErrorCode);
272
273 #endif
274
275 /**
276 * Lowercase the characters in a UTF-8 string.
277 * Casing is locale-dependent and context-sensitive.
278 * The result may be longer or shorter than the original.
279 * The source string and the destination buffer must not overlap.
280 *
281 * @param csm UCaseMap service object.
282 * @param dest A buffer for the result string. The result will be NUL-terminated if
283 * the buffer is large enough.
284 * The contents is undefined in case of failure.
285 * @param destCapacity The size of the buffer (number of bytes). If it is 0, then
286 * dest may be NULL and the function will only return the length of the result
287 * without writing any of the result string.
288 * @param src The original string.
289 * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
290 * @param pErrorCode Must be a valid pointer to an error code value,
291 * which must not indicate a failure before the function call.
292 * @return The length of the result string, if successful - or in case of a buffer overflow,
293 * in which case it will be greater than destCapacity.
294 *
295 * @see u_strToLower
296 * @stable ICU 3.4
297 */
298 U_STABLE int32_t U_EXPORT2
299 ucasemap_utf8ToLower(const UCaseMap *csm,
300 char *dest, int32_t destCapacity,
301 const char *src, int32_t srcLength,
302 UErrorCode *pErrorCode);
303
304 /**
305 * Uppercase the characters in a UTF-8 string.
306 * Casing is locale-dependent and context-sensitive.
307 * The result may be longer or shorter than the original.
308 * The source string and the destination buffer must not overlap.
309 *
310 * @param csm UCaseMap service object.
311 * @param dest A buffer for the result string. The result will be NUL-terminated if
312 * the buffer is large enough.
313 * The contents is undefined in case of failure.
314 * @param destCapacity The size of the buffer (number of bytes). If it is 0, then
315 * dest may be NULL and the function will only return the length of the result
316 * without writing any of the result string.
317 * @param src The original string.
318 * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
319 * @param pErrorCode Must be a valid pointer to an error code value,
320 * which must not indicate a failure before the function call.
321 * @return The length of the result string, if successful - or in case of a buffer overflow,
322 * in which case it will be greater than destCapacity.
323 *
324 * @see u_strToUpper
325 * @stable ICU 3.4
326 */
327 U_STABLE int32_t U_EXPORT2
328 ucasemap_utf8ToUpper(const UCaseMap *csm,
329 char *dest, int32_t destCapacity,
330 const char *src, int32_t srcLength,
331 UErrorCode *pErrorCode);
332
333 #if !UCONFIG_NO_BREAK_ITERATION
334
335 /**
336 * Titlecase a UTF-8 string.
337 * Casing is locale-dependent and context-sensitive.
338 * Titlecasing uses a break iterator to find the first characters of words
339 * that are to be titlecased. It titlecases those characters and lowercases
340 * all others. (This can be modified with ucasemap_setOptions().)
341 *
342 * Note: This function takes a non-const UCaseMap pointer because it will
343 * open a default break iterator if no break iterator was set yet,
344 * and effectively call ucasemap_setBreakIterator();
345 * also because the break iterator is stateful and will be modified during
346 * the iteration.
347 *
348 * The titlecase break iterator can be provided to customize for arbitrary
349 * styles, using rules and dictionaries beyond the standard iterators.
350 * The standard titlecase iterator for the root locale implements the
351 * algorithm of Unicode TR 21.
352 *
353 * This function uses only the setUText(), first(), next() and close() methods of the
354 * provided break iterator.
355 *
356 * The result may be longer or shorter than the original.
357 * The source string and the destination buffer must not overlap.
358 *
359 * @param csm UCaseMap service object. This pointer is non-const!
360 * See the note above for details.
361 * @param dest A buffer for the result string. The result will be NUL-terminated if
362 * the buffer is large enough.
363 * The contents is undefined in case of failure.
364 * @param destCapacity The size of the buffer (number of bytes). If it is 0, then
365 * dest may be NULL and the function will only return the length of the result
366 * without writing any of the result string.
367 * @param src The original string.
368 * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
369 * @param pErrorCode Must be a valid pointer to an error code value,
370 * which must not indicate a failure before the function call.
371 * @return The length of the result string, if successful - or in case of a buffer overflow,
372 * in which case it will be greater than destCapacity.
373 *
374 * @see u_strToTitle
375 * @see U_TITLECASE_NO_LOWERCASE
376 * @see U_TITLECASE_NO_BREAK_ADJUSTMENT
377 * @stable ICU 3.8
378 */
379 U_STABLE int32_t U_EXPORT2
380 ucasemap_utf8ToTitle(UCaseMap *csm,
381 char *dest, int32_t destCapacity,
382 const char *src, int32_t srcLength,
383 UErrorCode *pErrorCode);
384
385 #endif
386
387 /**
388 * Case-folds the characters in a UTF-8 string.
389 *
390 * Case-folding is locale-independent and not context-sensitive,
391 * but there is an option for whether to include or exclude mappings for dotted I
392 * and dotless i that are marked with 'T' in CaseFolding.txt.
393 *
394 * The result may be longer or shorter than the original.
395 * The source string and the destination buffer must not overlap.
396 *
397 * @param csm UCaseMap service object.
398 * @param dest A buffer for the result string. The result will be NUL-terminated if
399 * the buffer is large enough.
400 * The contents is undefined in case of failure.
401 * @param destCapacity The size of the buffer (number of bytes). If it is 0, then
402 * dest may be NULL and the function will only return the length of the result
403 * without writing any of the result string.
404 * @param src The original string.
405 * @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
406 * @param pErrorCode Must be a valid pointer to an error code value,
407 * which must not indicate a failure before the function call.
408 * @return The length of the result string, if successful - or in case of a buffer overflow,
409 * in which case it will be greater than destCapacity.
410 *
411 * @see u_strFoldCase
412 * @see ucasemap_setOptions
413 * @see U_FOLD_CASE_DEFAULT
414 * @see U_FOLD_CASE_EXCLUDE_SPECIAL_I
415 * @stable ICU 3.8
416 */
417 U_STABLE int32_t U_EXPORT2
418 ucasemap_utf8FoldCase(const UCaseMap *csm,
419 char *dest, int32_t destCapacity,
420 const char *src, int32_t srcLength,
421 UErrorCode *pErrorCode);
422
423 #endif

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