xref: /aosp_15_r20/external/icu/libandroidicu/include/unicode/stringoptions.h (revision 0e209d3975ff4a8c132096b14b0e9364a753506e)

// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html

// stringoptions.h
// created: 2017jun08 Markus W. Scherer

#ifndef __STRINGOPTIONS_H__
#define __STRINGOPTIONS_H__

#include "unicode/utypes.h"

/**
 * \file
 * \brief C API: Bit set option bit constants for various string and character processing functions.
 */

/**
 * Option value for case folding: Use default mappings defined in CaseFolding.txt.
 *
 * @stable ICU 2.0
 */
#define U_FOLD_CASE_DEFAULT 0

/**
 * Option value for case folding:
 *
 * Use the modified set of mappings provided in CaseFolding.txt to handle dotted I
 * and dotless i appropriately for Turkic languages (tr, az).
 *
 * Before Unicode 3.2, CaseFolding.txt contains mappings marked with 'I' that
 * are to be included for default mappings and
 * excluded for the Turkic-specific mappings.
 *
 * Unicode 3.2 CaseFolding.txt instead contains mappings marked with 'T' that
 * are to be excluded for default mappings and
 * included for the Turkic-specific mappings.
 *
 * @stable ICU 2.0
 */
#define U_FOLD_CASE_EXCLUDE_SPECIAL_I 1

/**
 * Titlecase the string as a whole rather than each word.
 * (Titlecase only the character at index 0, possibly adjusted.)
 * Option bits value for titlecasing APIs that take an options bit set.
 *
 * It is an error to specify multiple titlecasing iterator options together,
 * including both an options bit and an explicit BreakIterator.
 *
 * @see U_TITLECASE_ADJUST_TO_CASED
 * @stable ICU 60
 */
#define U_TITLECASE_WHOLE_STRING 0x20

/**
 * Titlecase sentences rather than words.
 * (Titlecase only the first character of each sentence, possibly adjusted.)
 * Option bits value for titlecasing APIs that take an options bit set.
 *
 * It is an error to specify multiple titlecasing iterator options together,
 * including both an options bit and an explicit BreakIterator.
 *
 * @see U_TITLECASE_ADJUST_TO_CASED
 * @stable ICU 60
 */
#define U_TITLECASE_SENTENCES 0x40

/**
 * Do not lowercase non-initial parts of words when titlecasing.
 * Option bit for titlecasing APIs that take an options bit set.
 *
 * By default, titlecasing will titlecase the character at each
 * (possibly adjusted) BreakIterator index and
 * lowercase all other characters up to the next iterator index.
 * With this option, the other characters will not be modified.
 *
 * @see U_TITLECASE_ADJUST_TO_CASED
 * @see UnicodeString::toTitle
 * @see CaseMap::toTitle
 * @see ucasemap_setOptions
 * @see ucasemap_toTitle
 * @see ucasemap_utf8ToTitle
 * @stable ICU 3.8
 */
#define U_TITLECASE_NO_LOWERCASE 0x100

/**
 * Do not adjust the titlecasing BreakIterator indexes;
 * titlecase exactly the characters at breaks from the iterator.
 * Option bit for titlecasing APIs that take an options bit set.
 *
 * By default, titlecasing will take each break iterator index,
 * adjust it to the next relevant character (see U_TITLECASE_ADJUST_TO_CASED),
 * and titlecase that one.
 *
 * Other characters are lowercased.
 *
 * It is an error to specify multiple titlecasing adjustment options together.
 *
 * @see U_TITLECASE_ADJUST_TO_CASED
 * @see U_TITLECASE_NO_LOWERCASE
 * @see UnicodeString::toTitle
 * @see CaseMap::toTitle
 * @see ucasemap_setOptions
 * @see ucasemap_toTitle
 * @see ucasemap_utf8ToTitle
 * @stable ICU 3.8
 */
#define U_TITLECASE_NO_BREAK_ADJUSTMENT 0x200

/**
 * Adjust each titlecasing BreakIterator index to the next cased character.
 * (See the Unicode Standard, chapter 3, Default Case Conversion, R3 toTitlecase(X).)
 * Option bit for titlecasing APIs that take an options bit set.
 *
 * This used to be the default index adjustment in ICU.
 * Since ICU 60, the default index adjustment is to the next character that is
 * a letter, number, symbol, or private use code point.
 * (Uncased modifier letters are skipped.)
 * The difference in behavior is small for word titlecasing,
 * but the new adjustment is much better for whole-string and sentence titlecasing:
 * It yields "49ers" and "«丰(abc)»" instead of "49Ers" and "«丰(Abc)»".
 *
 * It is an error to specify multiple titlecasing adjustment options together.
 *
 * @see U_TITLECASE_NO_BREAK_ADJUSTMENT
 * @stable ICU 60
 */
#define U_TITLECASE_ADJUST_TO_CASED 0x400

/**
 * Option for string transformation functions to not first reset the Edits object.
 * Used for example in some case-mapping and normalization functions.
 *
 * @see CaseMap
 * @see Edits
 * @see Normalizer2
 * @stable ICU 60
 */
#define U_EDITS_NO_RESET 0x2000

/**
 * Omit unchanged text when recording how source substrings
 * relate to changed and unchanged result substrings.
 * Used for example in some case-mapping and normalization functions.
 *
 * @see CaseMap
 * @see Edits
 * @see Normalizer2
 * @stable ICU 60
 */
#define U_OMIT_UNCHANGED_TEXT 0x4000

/**
 * Option bit for u_strCaseCompare, u_strcasecmp, unorm_compare, etc:
 * Compare strings in code point order instead of code unit order.
 * @stable ICU 2.2
 */
#define U_COMPARE_CODE_POINT_ORDER  0x8000

/**
 * Option bit for unorm_compare:
 * Perform case-insensitive comparison.
 * @stable ICU 2.2
 */
#define U_COMPARE_IGNORE_CASE       0x10000

/**
 * Option bit for unorm_compare:
 * Both input strings are assumed to fulfill FCD conditions.
 * @stable ICU 2.2
 */
#define UNORM_INPUT_IS_FCD          0x20000

// Related definitions elsewhere.
// Options that are not meaningful in the same functions
// can share the same bits.
//
// Public:
// unicode/unorm.h #define UNORM_COMPARE_NORM_OPTIONS_SHIFT 20
//
// Internal: (may change or be removed)
// ucase.h #define _STRCASECMP_OPTIONS_MASK 0xffff
// ucase.h #define _FOLD_CASE_OPTIONS_MASK 7
// ucasemap_imp.h #define U_TITLECASE_ITERATOR_MASK 0xe0
// ucasemap_imp.h #define U_TITLECASE_ADJUSTMENT_MASK 0x600
// ustr_imp.h #define _STRNCMP_STYLE 0x1000
// unormcmp.cpp #define _COMPARE_EQUIV 0x80000

#endif  // __STRINGOPTIONS_H__