1 // Copyright (C) 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
4 *******************************************************************************
6 * Copyright (C) 2004-2012, International Business Machines
7 * Corporation and others. All Rights Reserved.
9 *******************************************************************************
12 * tab size: 8 (not used)
15 * created on: 2004aug30
16 * created by: Markus W. Scherer
18 * Low-level Unicode character/string case mapping code.
24 #include "unicode/utypes.h"
25 #include "unicode/uset.h"
38 /* library API -------------------------------------------------------------- */
43 typedef struct UCaseProps UCaseProps;
47 U_CAPI const UCaseProps * U_EXPORT2
48 ucase_getSingleton(void);
50 U_CFUNC void U_EXPORT2
51 ucase_addPropertyStarts(const UCaseProps *csp, const USetAdder *sa, UErrorCode *pErrorCode);
54 * Requires non-NULL locale ID but otherwise does the equivalent of
55 * checking for language codes as if uloc_getLanguage() were called:
56 * Accepts both 2- and 3-letter codes and accepts case variants.
59 ucase_getCaseLocale(const char *locale, int32_t *locCache);
61 /* Casing locale types for ucase_getCaseLocale */
72 * Bit mask for getting just the options from a string compare options word
73 * that are relevant for case-insensitive string comparison.
74 * See uchar.h. Also include _STRNCMP_STYLE and U_COMPARE_CODE_POINT_ORDER.
77 #define _STRCASECMP_OPTIONS_MASK 0xffff
80 * Bit mask for getting just the options from a string compare options word
81 * that are relevant for case folding (of a single string or code point).
85 #define _FOLD_CASE_OPTIONS_MASK 0xff
87 /* single-code point functions */
89 U_CAPI UChar32 U_EXPORT2
90 ucase_tolower(const UCaseProps *csp, UChar32 c);
92 U_CAPI UChar32 U_EXPORT2
93 ucase_toupper(const UCaseProps *csp, UChar32 c);
95 U_CAPI UChar32 U_EXPORT2
96 ucase_totitle(const UCaseProps *csp, UChar32 c);
98 U_CAPI UChar32 U_EXPORT2
99 ucase_fold(const UCaseProps *csp, UChar32 c, uint32_t options);
102 * Adds all simple case mappings and the full case folding for c to sa,
103 * and also adds special case closure mappings.
104 * c itself is not added.
105 * For example, the mappings
106 * - for s include long s
107 * - for sharp s include ss
108 * - for k include the Kelvin sign
110 U_CFUNC void U_EXPORT2
111 ucase_addCaseClosure(const UCaseProps *csp, UChar32 c, const USetAdder *sa);
114 * Maps the string to single code points and adds the associated case closure
116 * The string is mapped to code points if it is their full case folding string.
117 * In other words, this performs a reverse full case folding and then
118 * adds the case closure items of the resulting code points.
119 * If the string is found and its closure applied, then
120 * the string itself is added as well as part of its code points' closure.
121 * It must be length>=0.
123 * @return TRUE if the string was found
125 U_CFUNC UBool U_EXPORT2
126 ucase_addStringCaseClosure(const UCaseProps *csp, const UChar *s, int32_t length, const USetAdder *sa);
132 * Iterator over characters with more than one code point in the full default Case_Folding.
134 class U_COMMON_API FullCaseFoldingIterator {
137 FullCaseFoldingIterator();
139 * Returns the next (cp, full) pair where "full" is cp's full default Case_Folding.
140 * Returns a negative cp value at the end of the iteration.
142 UChar32 next(UnicodeString &full);
144 FullCaseFoldingIterator(const FullCaseFoldingIterator &); // no copy
145 FullCaseFoldingIterator &operator=(const FullCaseFoldingIterator &); // no assignment
149 int32_t unfoldRowWidth;
150 int32_t unfoldStringWidth;
158 /** @return UCASE_NONE, UCASE_LOWER, UCASE_UPPER, UCASE_TITLE */
159 U_CAPI int32_t U_EXPORT2
160 ucase_getType(const UCaseProps *csp, UChar32 c);
162 /** @return like ucase_getType() but also sets UCASE_IGNORABLE if c is case-ignorable */
163 U_CAPI int32_t U_EXPORT2
164 ucase_getTypeOrIgnorable(const UCaseProps *csp, UChar32 c);
166 U_CAPI UBool U_EXPORT2
167 ucase_isSoftDotted(const UCaseProps *csp, UChar32 c);
169 U_CAPI UBool U_EXPORT2
170 ucase_isCaseSensitive(const UCaseProps *csp, UChar32 c);
172 /* string case mapping functions */
177 * Iterator function for string case mappings, which need to look at the
178 * context (surrounding text) of a given character for conditional mappings.
180 * The iterator only needs to go backward or forward away from the
181 * character in question. It does not use any indexes on this interface.
182 * It does not support random access or an arbitrary change of
183 * iteration direction.
185 * The code point being case-mapped itself is never returned by
188 * @param context A pointer to the iterator's working data.
189 * @param dir If <0 then start iterating backward from the character;
190 * if >0 then start iterating forward from the character;
191 * if 0 then continue iterating in the current direction.
192 * @return Next code point, or <0 when the iteration is done.
194 typedef UChar32 U_CALLCONV
195 UCaseContextIterator(void *context, int8_t dir);
198 * Sample struct which may be used by some implementations of
199 * UCaseContextIterator.
201 struct UCaseContext {
203 int32_t start, index, limit;
204 int32_t cpStart, cpLimit;
208 typedef struct UCaseContext UCaseContext;
212 #define UCASECONTEXT_INITIALIZER { NULL, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
216 * For string case mappings, a single character (a code point) is mapped
217 * either to itself (in which case in-place mapping functions do nothing),
218 * or to another single code point, or to a string.
219 * Aside from the string contents, these are indicated with a single int32_t
222 * Mapping to self: Negative values (~self instead of -self to support U+0000)
224 * Mapping to another code point: Positive values >UCASE_MAX_STRING_LENGTH
226 * Mapping to a string: The string length (0..UCASE_MAX_STRING_LENGTH) is
227 * returned. Note that the string result may indeed have zero length.
229 UCASE_MAX_STRING_LENGTH=0x1f
233 * Get the full lowercase mapping for c.
235 * @param csp Case mapping properties.
236 * @param c Character to be mapped.
237 * @param iter Character iterator, used for context-sensitive mappings.
238 * See UCaseContextIterator for details.
239 * If iter==NULL then a context-independent result is returned.
240 * @param context Pointer to be passed into iter.
241 * @param pString If the mapping result is a string, then the pointer is
242 * written to *pString.
243 * @param locale Locale ID for locale-dependent mappings.
244 * @param locCache Initialize to 0; may be used to cache the result of parsing
245 * the locale ID for subsequent calls.
247 * @return Output code point or string length, see UCASE_MAX_STRING_LENGTH.
249 * @see UCaseContextIterator
250 * @see UCASE_MAX_STRING_LENGTH
253 U_CAPI int32_t U_EXPORT2
254 ucase_toFullLower(const UCaseProps *csp, UChar32 c,
255 UCaseContextIterator *iter, void *context,
256 const UChar **pString,
257 const char *locale, int32_t *locCache);
259 U_CAPI int32_t U_EXPORT2
260 ucase_toFullUpper(const UCaseProps *csp, UChar32 c,
261 UCaseContextIterator *iter, void *context,
262 const UChar **pString,
263 const char *locale, int32_t *locCache);
265 U_CAPI int32_t U_EXPORT2
266 ucase_toFullTitle(const UCaseProps *csp, UChar32 c,
267 UCaseContextIterator *iter, void *context,
268 const UChar **pString,
269 const char *locale, int32_t *locCache);
271 U_CAPI int32_t U_EXPORT2
272 ucase_toFullFolding(const UCaseProps *csp, UChar32 c,
273 const UChar **pString,
276 U_CFUNC int32_t U_EXPORT2
277 ucase_hasBinaryProperty(UChar32 c, UProperty which);
285 typedef int32_t U_CALLCONV
286 UCaseMapFull(const UCaseProps *csp, UChar32 c,
287 UCaseContextIterator *iter, void *context,
288 const UChar **pString,
289 const char *locale, int32_t *locCache);
293 /* file definitions --------------------------------------------------------- */
295 #define UCASE_DATA_NAME "ucase"
296 #define UCASE_DATA_TYPE "icu"
299 #define UCASE_FMT_0 0x63
300 #define UCASE_FMT_1 0x41
301 #define UCASE_FMT_2 0x53
302 #define UCASE_FMT_3 0x45
304 /* indexes into indexes[] */
310 UCASE_IX_UNFOLD_LENGTH,
312 UCASE_IX_MAX_FULL_LENGTH=15,
316 /* definitions for 16-bit case properties word ------------------------------ */
318 /* 2-bit constants for types of cased characters */
319 #define UCASE_TYPE_MASK 3
327 #define UCASE_GET_TYPE(props) ((props)&UCASE_TYPE_MASK)
328 #define UCASE_GET_TYPE_AND_IGNORABLE(props) ((props)&7)
330 #define UCASE_IGNORABLE 4
331 #define UCASE_SENSITIVE 8
332 #define UCASE_EXCEPTION 0x10
334 #define UCASE_DOT_MASK 0x60
336 UCASE_NO_DOT=0, /* normal characters with cc=0 */
337 UCASE_SOFT_DOTTED=0x20, /* soft-dotted characters with cc=0 */
338 UCASE_ABOVE=0x40, /* "above" accents with cc=230 */
339 UCASE_OTHER_ACCENT=0x60 /* other accent character (0<cc!=230) */
342 /* no exception: bits 15..7 are a 9-bit signed case mapping delta */
343 #define UCASE_DELTA_SHIFT 7
344 #define UCASE_DELTA_MASK 0xff80
345 #define UCASE_MAX_DELTA 0xff
346 #define UCASE_MIN_DELTA (-UCASE_MAX_DELTA-1)
348 #if U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
349 # define UCASE_GET_DELTA(props) ((int16_t)(props)>>UCASE_DELTA_SHIFT)
351 # define UCASE_GET_DELTA(props) (int16_t)(((props)&0x8000) ? (((props)>>UCASE_DELTA_SHIFT)|0xfe00) : ((uint16_t)(props)>>UCASE_DELTA_SHIFT))
354 /* exception: bits 15..5 are an unsigned 11-bit index into the exceptions array */
355 #define UCASE_EXC_SHIFT 5
356 #define UCASE_EXC_MASK 0xffe0
357 #define UCASE_MAX_EXCEPTIONS ((UCASE_EXC_MASK>>UCASE_EXC_SHIFT)+1)
359 /* definitions for 16-bit main exceptions word ------------------------------ */
361 /* first 8 bits indicate values in optional slots */
367 UCASE_EXC_4, /* reserved */
368 UCASE_EXC_5, /* reserved */
370 UCASE_EXC_FULL_MAPPINGS,
371 UCASE_EXC_ALL_SLOTS /* one past the last slot */
374 /* each slot is 2 uint16_t instead of 1 */
375 #define UCASE_EXC_DOUBLE_SLOTS 0x100
377 /* reserved: exception bits 11..9 */
379 /* UCASE_EXC_DOT_MASK=UCASE_DOT_MASK<<UCASE_EXC_DOT_SHIFT */
380 #define UCASE_EXC_DOT_SHIFT 7
382 /* normally stored in the main word, but pushed out for larger exception indexes */
383 #define UCASE_EXC_DOT_MASK 0x3000
386 UCASE_EXC_SOFT_DOTTED=0x1000,
387 UCASE_EXC_ABOVE=0x2000, /* "above" accents with cc=230 */
388 UCASE_EXC_OTHER_ACCENT=0x3000 /* other character (0<cc!=230) */
391 /* complex/conditional mappings */
392 #define UCASE_EXC_CONDITIONAL_SPECIAL 0x4000
393 #define UCASE_EXC_CONDITIONAL_FOLD 0x8000
395 /* definitions for lengths word for full case mappings */
396 #define UCASE_FULL_LOWER 0xf
397 #define UCASE_FULL_FOLDING 0xf0
398 #define UCASE_FULL_UPPER 0xf00
399 #define UCASE_FULL_TITLE 0xf000
401 /* maximum lengths */
402 #define UCASE_FULL_MAPPINGS_MAX_LENGTH (4*0xf)
403 #define UCASE_CLOSURE_MAX_LENGTH 0xf
405 /* constants for reverse case folding ("unfold") data */
408 UCASE_UNFOLD_ROW_WIDTH,
409 UCASE_UNFOLD_STRING_WIDTH