198 lines
9.2 KiB
C++
198 lines
9.2 KiB
C++
// © 2017 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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// casemap.h
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// created: 2017jan12 Markus W. Scherer
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#ifndef __CASEMAP_H__
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#define __CASEMAP_H__
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#include "unicode/utypes.h"
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#include "unicode/uobject.h"
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/**
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* \file
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* \brief C++ API: Low-level C++ case mapping functions.
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*/
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U_NAMESPACE_BEGIN
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#ifndef U_HIDE_DRAFT_API
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class BreakIterator;
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class Edits;
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/**
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* Low-level C++ case mapping functions.
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*
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* @draft ICU 59
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*/
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class U_COMMON_API CaseMap final : public UMemory {
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public:
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/**
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* Lowercases a UTF-16 string and optionally records edits.
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* Casing is locale-dependent and context-sensitive.
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* The result may be longer or shorter than the original.
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* The source string and the destination buffer must not overlap.
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*
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* @param locale The locale ID. ("" = root locale, NULL = default locale.)
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* @param options Options bit set, usually 0. See UCASEMAP_OMIT_UNCHANGED_TEXT.
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* @param src The original string.
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* @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
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* @param dest A buffer for the result string. The result will be NUL-terminated if
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* the buffer is large enough.
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* The contents is undefined in case of failure.
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* @param destCapacity The size of the buffer (number of UChars). If it is 0, then
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* dest may be NULL and the function will only return the length of the result
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* without writing any of the result string.
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* @param edits Records edits for index mapping, working with styled text,
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* and getting only changes (if any).
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* This function calls edits->reset() first. edits can be NULL.
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* @param errorCode Reference to an in/out error code value
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* which must not indicate a failure before the function call.
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* @return The length of the result string, if successful.
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* When the result would be longer than destCapacity,
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* the full length is returned and a U_BUFFER_OVERFLOW_ERROR is set.
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*
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* @see u_strToLower
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* @draft ICU 59
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*/
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static int32_t toLower(
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const char *locale, uint32_t options,
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const UChar *src, int32_t srcLength,
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UChar *dest, int32_t destCapacity, Edits *edits,
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UErrorCode &errorCode);
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/**
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* Uppercases a UTF-16 string and optionally records edits.
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* Casing is locale-dependent and context-sensitive.
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* The result may be longer or shorter than the original.
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* The source string and the destination buffer must not overlap.
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*
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* @param locale The locale ID. ("" = root locale, NULL = default locale.)
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* @param options Options bit set, usually 0. See UCASEMAP_OMIT_UNCHANGED_TEXT.
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* @param src The original string.
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* @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
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* @param dest A buffer for the result string. The result will be NUL-terminated if
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* the buffer is large enough.
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* The contents is undefined in case of failure.
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* @param destCapacity The size of the buffer (number of UChars). If it is 0, then
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* dest may be NULL and the function will only return the length of the result
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* without writing any of the result string.
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* @param edits Records edits for index mapping, working with styled text,
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* and getting only changes (if any).
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* This function calls edits->reset() first. edits can be NULL.
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* @param errorCode Reference to an in/out error code value
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* which must not indicate a failure before the function call.
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* @return The length of the result string, if successful.
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* When the result would be longer than destCapacity,
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* the full length is returned and a U_BUFFER_OVERFLOW_ERROR is set.
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*
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* @see u_strToUpper
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* @draft ICU 59
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*/
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static int32_t toUpper(
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const char *locale, uint32_t options,
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const UChar *src, int32_t srcLength,
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UChar *dest, int32_t destCapacity, Edits *edits,
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UErrorCode &errorCode);
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#if !UCONFIG_NO_BREAK_ITERATION
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/**
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* Titlecases a UTF-16 string and optionally records edits.
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* Casing is locale-dependent and context-sensitive.
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* The result may be longer or shorter than the original.
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* The source string and the destination buffer must not overlap.
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*
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* Titlecasing uses a break iterator to find the first characters of words
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* that are to be titlecased. It titlecases those characters and lowercases
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* all others. (This can be modified with options bits.)
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*
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* @param locale The locale ID. ("" = root locale, NULL = default locale.)
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* @param options Options bit set, usually 0. See UCASEMAP_OMIT_UNCHANGED_TEXT,
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* U_TITLECASE_NO_LOWERCASE, U_TITLECASE_NO_BREAK_ADJUSTMENT.
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* @param iter A break iterator to find the first characters of words that are to be titlecased.
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* It is set to the source string (setText())
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* and used one or more times for iteration (first() and next()).
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* If NULL, then a word break iterator for the locale is used
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* (or something equivalent).
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* @param src The original string.
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* @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
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* @param dest A buffer for the result string. The result will be NUL-terminated if
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* the buffer is large enough.
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* The contents is undefined in case of failure.
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* @param destCapacity The size of the buffer (number of UChars). If it is 0, then
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* dest may be NULL and the function will only return the length of the result
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* without writing any of the result string.
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* @param edits Records edits for index mapping, working with styled text,
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* and getting only changes (if any).
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* This function calls edits->reset() first. edits can be NULL.
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* @param errorCode Reference to an in/out error code value
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* which must not indicate a failure before the function call.
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* @return The length of the result string, if successful.
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* When the result would be longer than destCapacity,
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* the full length is returned and a U_BUFFER_OVERFLOW_ERROR is set.
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*
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* @see u_strToTitle
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* @see ucasemap_toTitle
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* @draft ICU 59
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*/
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static int32_t toTitle(
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const char *locale, uint32_t options, BreakIterator *iter,
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const UChar *src, int32_t srcLength,
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UChar *dest, int32_t destCapacity, Edits *edits,
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UErrorCode &errorCode);
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#endif // UCONFIG_NO_BREAK_ITERATION
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/**
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* Case-folds a UTF-16 string and optionally records edits.
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*
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* Case folding is locale-independent and not context-sensitive,
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* but there is an option for whether to include or exclude mappings for dotted I
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* and dotless i that are marked with 'T' in CaseFolding.txt.
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*
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* The result may be longer or shorter than the original.
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* The source string and the destination buffer must not overlap.
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*
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* @param options Options bit set, usually 0. See UCASEMAP_OMIT_UNCHANGED_TEXT,
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* U_FOLD_CASE_DEFAULT, U_FOLD_CASE_EXCLUDE_SPECIAL_I.
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* @param src The original string.
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* @param srcLength The length of the original string. If -1, then src must be NUL-terminated.
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* @param dest A buffer for the result string. The result will be NUL-terminated if
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* the buffer is large enough.
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* The contents is undefined in case of failure.
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* @param destCapacity The size of the buffer (number of UChars). If it is 0, then
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* dest may be NULL and the function will only return the length of the result
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* without writing any of the result string.
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* @param edits Records edits for index mapping, working with styled text,
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* and getting only changes (if any).
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* This function calls edits->reset() first. edits can be NULL.
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* @param errorCode Reference to an in/out error code value
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* which must not indicate a failure before the function call.
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* @return The length of the result string, if successful.
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* When the result would be longer than destCapacity,
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* the full length is returned and a U_BUFFER_OVERFLOW_ERROR is set.
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*
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* @see u_strFoldCase
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* @draft ICU 59
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*/
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static int32_t fold(
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uint32_t options,
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const UChar *src, int32_t srcLength,
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UChar *dest, int32_t destCapacity, Edits *edits,
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UErrorCode &errorCode);
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private:
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CaseMap() = delete;
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CaseMap(const CaseMap &other) = delete;
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CaseMap &operator=(const CaseMap &other) = delete;
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};
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#endif // U_HIDE_DRAFT_API
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U_NAMESPACE_END
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#endif // __CASEMAP_H__
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