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comparison: intl/icu/source/common/ucase.h

intl/icu/source/common/ucase.h

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1 /*
2 *******************************************************************************
3 *
4 * Copyright (C) 2004-2012, International Business Machines
5 * Corporation and others. All Rights Reserved.
6 *
7 *******************************************************************************
8 * file name: ucase.h
9 * encoding: US-ASCII
10 * tab size: 8 (not used)
11 * indentation:4
12 *
13 * created on: 2004aug30
14 * created by: Markus W. Scherer
15 *
16 * Low-level Unicode character/string case mapping code.
17 */
18
19 #ifndef __UCASE_H__
20 #define __UCASE_H__
21
22 #include "unicode/utypes.h"
23 #include "unicode/uset.h"
24 #include "putilimp.h"
25 #include "uset_imp.h"
26 #include "udataswp.h"
27
28 #ifdef __cplusplus
29 U_NAMESPACE_BEGIN
30
31 class UnicodeString;
32
33 U_NAMESPACE_END
34 #endif
35
36 /* library API -------------------------------------------------------------- */
37
38 U_CDECL_BEGIN
39
40 struct UCaseProps;
41 typedef struct UCaseProps UCaseProps;
42
43 U_CDECL_END
44
45 U_CAPI const UCaseProps * U_EXPORT2
46 ucase_getSingleton(void);
47
48 U_CFUNC void U_EXPORT2
49 ucase_addPropertyStarts(const UCaseProps *csp, const USetAdder *sa, UErrorCode *pErrorCode);
50
51 /**
52 * Requires non-NULL locale ID but otherwise does the equivalent of
53 * checking for language codes as if uloc_getLanguage() were called:
54 * Accepts both 2- and 3-letter codes and accepts case variants.
55 */
56 U_CFUNC int32_t
57 ucase_getCaseLocale(const char *locale, int32_t *locCache);
58
59 /* Casing locale types for ucase_getCaseLocale */
60 enum {
61 UCASE_LOC_UNKNOWN,
62 UCASE_LOC_ROOT,
63 UCASE_LOC_TURKISH,
64 UCASE_LOC_LITHUANIAN,
65 UCASE_LOC_DUTCH
66 };
67
68 /**
69 * Bit mask for getting just the options from a string compare options word
70 * that are relevant for case-insensitive string comparison.
71 * See uchar.h. Also include _STRNCMP_STYLE and U_COMPARE_CODE_POINT_ORDER.
72 * @internal
73 */
74 #define _STRCASECMP_OPTIONS_MASK 0xffff
75
76 /**
77 * Bit mask for getting just the options from a string compare options word
78 * that are relevant for case folding (of a single string or code point).
79 * See uchar.h.
80 * @internal
81 */
82 #define _FOLD_CASE_OPTIONS_MASK 0xff
83
84 /* single-code point functions */
85
86 U_CAPI UChar32 U_EXPORT2
87 ucase_tolower(const UCaseProps *csp, UChar32 c);
88
89 U_CAPI UChar32 U_EXPORT2
90 ucase_toupper(const UCaseProps *csp, UChar32 c);
91
92 U_CAPI UChar32 U_EXPORT2
93 ucase_totitle(const UCaseProps *csp, UChar32 c);
94
95 U_CAPI UChar32 U_EXPORT2
96 ucase_fold(const UCaseProps *csp, UChar32 c, uint32_t options);
97
98 /**
99 * Adds all simple case mappings and the full case folding for c to sa,
100 * and also adds special case closure mappings.
101 * c itself is not added.
102 * For example, the mappings
103 * - for s include long s
104 * - for sharp s include ss
105 * - for k include the Kelvin sign
106 */
107 U_CFUNC void U_EXPORT2
108 ucase_addCaseClosure(const UCaseProps *csp, UChar32 c, const USetAdder *sa);
109
110 /**
111 * Maps the string to single code points and adds the associated case closure
112 * mappings.
113 * The string is mapped to code points if it is their full case folding string.
114 * In other words, this performs a reverse full case folding and then
115 * adds the case closure items of the resulting code points.
116 * If the string is found and its closure applied, then
117 * the string itself is added as well as part of its code points' closure.
118 * It must be length>=0.
119 *
120 * @return TRUE if the string was found
121 */
122 U_CFUNC UBool U_EXPORT2
123 ucase_addStringCaseClosure(const UCaseProps *csp, const UChar *s, int32_t length, const USetAdder *sa);
124
125 #ifdef __cplusplus
126 U_NAMESPACE_BEGIN
127
128 /**
129 * Iterator over characters with more than one code point in the full default Case_Folding.
130 */
131 class U_COMMON_API FullCaseFoldingIterator {
132 public:
133 /** Constructor. */
134 FullCaseFoldingIterator();
135 /**
136 * Returns the next (cp, full) pair where "full" is cp's full default Case_Folding.
137 * Returns a negative cp value at the end of the iteration.
138 */
139 UChar32 next(UnicodeString &full);
140 private:
141 FullCaseFoldingIterator(const FullCaseFoldingIterator &); // no copy
142 FullCaseFoldingIterator &operator=(const FullCaseFoldingIterator &); // no assignment
143
144 const UChar *unfold;
145 int32_t unfoldRows;
146 int32_t unfoldRowWidth;
147 int32_t unfoldStringWidth;
148 int32_t currentRow;
149 int32_t rowCpIndex;
150 };
151
152 U_NAMESPACE_END
153 #endif
154
155 /** @return UCASE_NONE, UCASE_LOWER, UCASE_UPPER, UCASE_TITLE */
156 U_CAPI int32_t U_EXPORT2
157 ucase_getType(const UCaseProps *csp, UChar32 c);
158
159 /** @return same as ucase_getType(), or <0 if c is case-ignorable */
160 U_CAPI int32_t U_EXPORT2
161 ucase_getTypeOrIgnorable(const UCaseProps *csp, UChar32 c);
162
163 U_CAPI UBool U_EXPORT2
164 ucase_isSoftDotted(const UCaseProps *csp, UChar32 c);
165
166 U_CAPI UBool U_EXPORT2
167 ucase_isCaseSensitive(const UCaseProps *csp, UChar32 c);
168
169 /* string case mapping functions */
170
171 U_CDECL_BEGIN
172
173 /**
174 * Iterator function for string case mappings, which need to look at the
175 * context (surrounding text) of a given character for conditional mappings.
176 *
177 * The iterator only needs to go backward or forward away from the
178 * character in question. It does not use any indexes on this interface.
179 * It does not support random access or an arbitrary change of
180 * iteration direction.
181 *
182 * The code point being case-mapped itself is never returned by
183 * this iterator.
184 *
185 * @param context A pointer to the iterator's working data.
186 * @param dir If <0 then start iterating backward from the character;
187 * if >0 then start iterating forward from the character;
188 * if 0 then continue iterating in the current direction.
189 * @return Next code point, or <0 when the iteration is done.
190 */
191 typedef UChar32 U_CALLCONV
192 UCaseContextIterator(void *context, int8_t dir);
193
194 /**
195 * Sample struct which may be used by some implementations of
196 * UCaseContextIterator.
197 */
198 struct UCaseContext {
199 void *p;
200 int32_t start, index, limit;
201 int32_t cpStart, cpLimit;
202 int8_t dir;
203 int8_t b1, b2, b3;
204 };
205 typedef struct UCaseContext UCaseContext;
206
207 U_CDECL_END
208
209 #define UCASECONTEXT_INITIALIZER { NULL, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
210
211 enum {
212 /**
213 * For string case mappings, a single character (a code point) is mapped
214 * either to itself (in which case in-place mapping functions do nothing),
215 * or to another single code point, or to a string.
216 * Aside from the string contents, these are indicated with a single int32_t
217 * value as follows:
218 *
219 * Mapping to self: Negative values (~self instead of -self to support U+0000)
220 *
221 * Mapping to another code point: Positive values >UCASE_MAX_STRING_LENGTH
222 *
223 * Mapping to a string: The string length (0..UCASE_MAX_STRING_LENGTH) is
224 * returned. Note that the string result may indeed have zero length.
225 */
226 UCASE_MAX_STRING_LENGTH=0x1f
227 };
228
229 /**
230 * Get the full lowercase mapping for c.
231 *
232 * @param csp Case mapping properties.
233 * @param c Character to be mapped.
234 * @param iter Character iterator, used for context-sensitive mappings.
235 * See UCaseContextIterator for details.
236 * If iter==NULL then a context-independent result is returned.
237 * @param context Pointer to be passed into iter.
238 * @param pString If the mapping result is a string, then the pointer is
239 * written to *pString.
240 * @param locale Locale ID for locale-dependent mappings.
241 * @param locCache Initialize to 0; may be used to cache the result of parsing
242 * the locale ID for subsequent calls.
243 * Can be NULL.
244 * @return Output code point or string length, see UCASE_MAX_STRING_LENGTH.
245 *
246 * @see UCaseContextIterator
247 * @see UCASE_MAX_STRING_LENGTH
248 * @internal
249 */
250 U_CAPI int32_t U_EXPORT2
251 ucase_toFullLower(const UCaseProps *csp, UChar32 c,
252 UCaseContextIterator *iter, void *context,
253 const UChar **pString,
254 const char *locale, int32_t *locCache);
255
256 U_CAPI int32_t U_EXPORT2
257 ucase_toFullUpper(const UCaseProps *csp, UChar32 c,
258 UCaseContextIterator *iter, void *context,
259 const UChar **pString,
260 const char *locale, int32_t *locCache);
261
262 U_CAPI int32_t U_EXPORT2
263 ucase_toFullTitle(const UCaseProps *csp, UChar32 c,
264 UCaseContextIterator *iter, void *context,
265 const UChar **pString,
266 const char *locale, int32_t *locCache);
267
268 U_CAPI int32_t U_EXPORT2
269 ucase_toFullFolding(const UCaseProps *csp, UChar32 c,
270 const UChar **pString,
271 uint32_t options);
272
273 U_CFUNC int32_t U_EXPORT2
274 ucase_hasBinaryProperty(UChar32 c, UProperty which);
275
276
277 U_CDECL_BEGIN
278
279 /**
280 * @internal
281 */
282 typedef int32_t U_CALLCONV
283 UCaseMapFull(const UCaseProps *csp, UChar32 c,
284 UCaseContextIterator *iter, void *context,
285 const UChar **pString,
286 const char *locale, int32_t *locCache);
287
288 U_CDECL_END
289
290 /* file definitions --------------------------------------------------------- */
291
292 #define UCASE_DATA_NAME "ucase"
293 #define UCASE_DATA_TYPE "icu"
294
295 /* format "cAsE" */
296 #define UCASE_FMT_0 0x63
297 #define UCASE_FMT_1 0x41
298 #define UCASE_FMT_2 0x53
299 #define UCASE_FMT_3 0x45
300
301 /* indexes into indexes[] */
302 enum {
303 UCASE_IX_INDEX_TOP,
304 UCASE_IX_LENGTH,
305 UCASE_IX_TRIE_SIZE,
306 UCASE_IX_EXC_LENGTH,
307 UCASE_IX_UNFOLD_LENGTH,
308
309 UCASE_IX_MAX_FULL_LENGTH=15,
310 UCASE_IX_TOP=16
311 };
312
313 /* definitions for 16-bit case properties word ------------------------------ */
314
315 /* 2-bit constants for types of cased characters */
316 #define UCASE_TYPE_MASK 3
317 enum {
318 UCASE_NONE,
319 UCASE_LOWER,
320 UCASE_UPPER,
321 UCASE_TITLE
322 };
323
324 #define UCASE_GET_TYPE(props) ((props)&UCASE_TYPE_MASK)
325 #define UCASE_GET_TYPE_AND_IGNORABLE(props) ((props)&7)
326
327 #define UCASE_IGNORABLE 4
328 #define UCASE_SENSITIVE 8
329 #define UCASE_EXCEPTION 0x10
330
331 #define UCASE_DOT_MASK 0x60
332 enum {
333 UCASE_NO_DOT=0, /* normal characters with cc=0 */
334 UCASE_SOFT_DOTTED=0x20, /* soft-dotted characters with cc=0 */
335 UCASE_ABOVE=0x40, /* "above" accents with cc=230 */
336 UCASE_OTHER_ACCENT=0x60 /* other accent character (0<cc!=230) */
337 };
338
339 /* no exception: bits 15..7 are a 9-bit signed case mapping delta */
340 #define UCASE_DELTA_SHIFT 7
341 #define UCASE_DELTA_MASK 0xff80
342 #define UCASE_MAX_DELTA 0xff
343 #define UCASE_MIN_DELTA (-UCASE_MAX_DELTA-1)
344
345 #if U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
346 # define UCASE_GET_DELTA(props) ((int16_t)(props)>>UCASE_DELTA_SHIFT)
347 #else
348 # define UCASE_GET_DELTA(props) (int16_t)(((props)&0x8000) ? (((props)>>UCASE_DELTA_SHIFT)|0xfe00) : ((uint16_t)(props)>>UCASE_DELTA_SHIFT))
349 #endif
350
351 /* exception: bits 15..5 are an unsigned 11-bit index into the exceptions array */
352 #define UCASE_EXC_SHIFT 5
353 #define UCASE_EXC_MASK 0xffe0
354 #define UCASE_MAX_EXCEPTIONS ((UCASE_EXC_MASK>>UCASE_EXC_SHIFT)+1)
355
356 /* definitions for 16-bit main exceptions word ------------------------------ */
357
358 /* first 8 bits indicate values in optional slots */
359 enum {
360 UCASE_EXC_LOWER,
361 UCASE_EXC_FOLD,
362 UCASE_EXC_UPPER,
363 UCASE_EXC_TITLE,
364 UCASE_EXC_4, /* reserved */
365 UCASE_EXC_5, /* reserved */
366 UCASE_EXC_CLOSURE,
367 UCASE_EXC_FULL_MAPPINGS,
368 UCASE_EXC_ALL_SLOTS /* one past the last slot */
369 };
370
371 /* each slot is 2 uint16_t instead of 1 */
372 #define UCASE_EXC_DOUBLE_SLOTS 0x100
373
374 /* reserved: exception bits 11..9 */
375
376 /* UCASE_EXC_DOT_MASK=UCASE_DOT_MASK<<UCASE_EXC_DOT_SHIFT */
377 #define UCASE_EXC_DOT_SHIFT 7
378
379 /* normally stored in the main word, but pushed out for larger exception indexes */
380 #define UCASE_EXC_DOT_MASK 0x3000
381 enum {
382 UCASE_EXC_NO_DOT=0,
383 UCASE_EXC_SOFT_DOTTED=0x1000,
384 UCASE_EXC_ABOVE=0x2000, /* "above" accents with cc=230 */
385 UCASE_EXC_OTHER_ACCENT=0x3000 /* other character (0<cc!=230) */
386 };
387
388 /* complex/conditional mappings */
389 #define UCASE_EXC_CONDITIONAL_SPECIAL 0x4000
390 #define UCASE_EXC_CONDITIONAL_FOLD 0x8000
391
392 /* definitions for lengths word for full case mappings */
393 #define UCASE_FULL_LOWER 0xf
394 #define UCASE_FULL_FOLDING 0xf0
395 #define UCASE_FULL_UPPER 0xf00
396 #define UCASE_FULL_TITLE 0xf000
397
398 /* maximum lengths */
399 #define UCASE_FULL_MAPPINGS_MAX_LENGTH (4*0xf)
400 #define UCASE_CLOSURE_MAX_LENGTH 0xf
401
402 /* constants for reverse case folding ("unfold") data */
403 enum {
404 UCASE_UNFOLD_ROWS,
405 UCASE_UNFOLD_ROW_WIDTH,
406 UCASE_UNFOLD_STRING_WIDTH
407 };
408
409 #endif

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