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Diffstat (limited to 'intl/icu/source/i18n/unicode/ucoleitr.h')
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diff --git a/intl/icu/source/i18n/unicode/ucoleitr.h b/intl/icu/source/i18n/unicode/ucoleitr.h new file mode 100644 index 0000000000..25efcf2a08 --- /dev/null +++ b/intl/icu/source/i18n/unicode/ucoleitr.h @@ -0,0 +1,276 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +******************************************************************************* +* Copyright (C) 2001-2014, International Business Machines +* Corporation and others. All Rights Reserved. +******************************************************************************* +* +* File ucoleitr.h +* +* Modification History: +* +* Date Name Description +* 02/15/2001 synwee Modified all methods to process its own function +* instead of calling the equivalent c++ api (coleitr.h) +*******************************************************************************/ + +#ifndef UCOLEITR_H +#define UCOLEITR_H + +#include "unicode/utypes.h" + +#if !UCONFIG_NO_COLLATION + +/** + * This indicates an error has occurred during processing or if no more CEs is + * to be returned. + * @stable ICU 2.0 + */ +#define UCOL_NULLORDER ((int32_t)0xFFFFFFFF) + +#include "unicode/ucol.h" + +/** + * The UCollationElements struct. + * For usage in C programs. + * @stable ICU 2.0 + */ +typedef struct UCollationElements UCollationElements; + +/** + * \file + * \brief C API: UCollationElements + * + * The UCollationElements API is used as an iterator to walk through each + * character of an international string. Use the iterator to return the + * ordering priority of the positioned character. The ordering priority of a + * character, which we refer to as a key, defines how a character is collated + * in the given collation object. + * For example, consider the following in Slovak and in traditional Spanish collation: + * <pre> + * . "ca" -> the first key is key('c') and second key is key('a'). + * . "cha" -> the first key is key('ch') and second key is key('a'). + * </pre> + * And in German phonebook collation, + * <pre> + * . "<ae ligature>b"-> the first key is key('a'), the second key is key('e'), and + * . the third key is key('b'). + * </pre> + * <p>Example of the iterator usage: (without error checking) + * <pre> + * . void CollationElementIterator_Example() + * . { + * . UChar *s; + * . t_int32 order, primaryOrder; + * . UCollationElements *c; + * . UCollatorOld *coll; + * . UErrorCode success = U_ZERO_ERROR; + * . str=(UChar*)malloc(sizeof(UChar) * (strlen("This is a test")+1) ); + * . u_uastrcpy(str, "This is a test"); + * . coll = ucol_open(NULL, &success); + * . c = ucol_openElements(coll, str, u_strlen(str), &status); + * . order = ucol_next(c, &success); + * . ucol_reset(c); + * . order = ucol_prev(c, &success); + * . free(str); + * . ucol_close(coll); + * . ucol_closeElements(c); + * . } + * </pre> + * <p> + * ucol_next() returns the collation order of the next. + * ucol_prev() returns the collation order of the previous character. + * The Collation Element Iterator moves only in one direction between calls to + * ucol_reset. That is, ucol_next() and ucol_prev can not be inter-used. + * Whenever ucol_prev is to be called after ucol_next() or vice versa, + * ucol_reset has to be called first to reset the status, shifting pointers to + * either the end or the start of the string. Hence at the next call of + * ucol_prev or ucol_next, the first or last collation order will be returned. + * If a change of direction is done without a ucol_reset, the result is + * undefined. + * The result of a forward iterate (ucol_next) and reversed result of the + * backward iterate (ucol_prev) on the same string are equivalent, if + * collation orders with the value 0 are ignored. + * Character based on the comparison level of the collator. A collation order + * consists of primary order, secondary order and tertiary order. The data + * type of the collation order is <strong>int32_t</strong>. + * + * @see UCollator + */ + +/** + * Open the collation elements for a string. + * + * The UCollationElements retains a pointer to the supplied text. + * The caller must not modify or delete the text while the UCollationElements + * object is used to iterate over this text. + * + * @param coll The collator containing the desired collation rules. + * @param text The text to iterate over. + * @param textLength The number of characters in text, or -1 if null-terminated + * @param status A pointer to a UErrorCode to receive any errors. + * @return a struct containing collation element information + * @stable ICU 2.0 + */ +U_CAPI UCollationElements* U_EXPORT2 +ucol_openElements(const UCollator *coll, + const UChar *text, + int32_t textLength, + UErrorCode *status); + +/** + * get a hash code for a key... Not very useful! + * @param key the given key. + * @param length the size of the key array. + * @return the hash code. + * @stable ICU 2.0 + */ +U_CAPI int32_t U_EXPORT2 +ucol_keyHashCode(const uint8_t* key, int32_t length); + +/** + * Close a UCollationElements. + * Once closed, a UCollationElements may no longer be used. + * @param elems The UCollationElements to close. + * @stable ICU 2.0 + */ +U_CAPI void U_EXPORT2 +ucol_closeElements(UCollationElements *elems); + +/** + * Reset the collation elements to their initial state. + * This will move the 'cursor' to the beginning of the text. + * Property settings for collation will be reset to the current status. + * @param elems The UCollationElements to reset. + * @see ucol_next + * @see ucol_previous + * @stable ICU 2.0 + */ +U_CAPI void U_EXPORT2 +ucol_reset(UCollationElements *elems); + +/** + * Get the ordering priority of the next collation element in the text. + * A single character may contain more than one collation element. + * @param elems The UCollationElements containing the text. + * @param status A pointer to a UErrorCode to receive any errors. + * @return The next collation elements ordering, otherwise returns UCOL_NULLORDER + * if an error has occurred or if the end of string has been reached + * @stable ICU 2.0 + */ +U_CAPI int32_t U_EXPORT2 +ucol_next(UCollationElements *elems, UErrorCode *status); + +/** + * Get the ordering priority of the previous collation element in the text. + * A single character may contain more than one collation element. + * Note that internally a stack is used to store buffered collation elements. + * @param elems The UCollationElements containing the text. + * @param status A pointer to a UErrorCode to receive any errors. Notably + * a U_BUFFER_OVERFLOW_ERROR is returned if the internal stack + * buffer has been exhausted. + * @return The previous collation elements ordering, otherwise returns + * UCOL_NULLORDER if an error has occurred or if the start of string has + * been reached. + * @stable ICU 2.0 + */ +U_CAPI int32_t U_EXPORT2 +ucol_previous(UCollationElements *elems, UErrorCode *status); + +/** + * Get the maximum length of any expansion sequences that end with the + * specified comparison order. + * This is useful for .... ? + * @param elems The UCollationElements containing the text. + * @param order A collation order returned by previous or next. + * @return maximum size of the expansion sequences ending with the collation + * element or 1 if collation element does not occur at the end of any + * expansion sequence + * @stable ICU 2.0 + */ +U_CAPI int32_t U_EXPORT2 +ucol_getMaxExpansion(const UCollationElements *elems, int32_t order); + +/** + * Set the text containing the collation elements. + * Property settings for collation will remain the same. + * In order to reset the iterator to the current collation property settings, + * the API reset() has to be called. + * + * The UCollationElements retains a pointer to the supplied text. + * The caller must not modify or delete the text while the UCollationElements + * object is used to iterate over this text. + * + * @param elems The UCollationElements to set. + * @param text The source text containing the collation elements. + * @param textLength The length of text, or -1 if null-terminated. + * @param status A pointer to a UErrorCode to receive any errors. + * @see ucol_getText + * @stable ICU 2.0 + */ +U_CAPI void U_EXPORT2 +ucol_setText( UCollationElements *elems, + const UChar *text, + int32_t textLength, + UErrorCode *status); + +/** + * Get the offset of the current source character. + * This is an offset into the text of the character containing the current + * collation elements. + * @param elems The UCollationElements to query. + * @return The offset of the current source character. + * @see ucol_setOffset + * @stable ICU 2.0 + */ +U_CAPI int32_t U_EXPORT2 +ucol_getOffset(const UCollationElements *elems); + +/** + * Set the offset of the current source character. + * This is an offset into the text of the character to be processed. + * Property settings for collation will remain the same. + * In order to reset the iterator to the current collation property settings, + * the API reset() has to be called. + * @param elems The UCollationElements to set. + * @param offset The desired character offset. + * @param status A pointer to a UErrorCode to receive any errors. + * @see ucol_getOffset + * @stable ICU 2.0 + */ +U_CAPI void U_EXPORT2 +ucol_setOffset(UCollationElements *elems, + int32_t offset, + UErrorCode *status); + +/** +* Get the primary order of a collation order. +* @param order the collation order +* @return the primary order of a collation order. +* @stable ICU 2.6 +*/ +U_CAPI int32_t U_EXPORT2 +ucol_primaryOrder (int32_t order); + +/** +* Get the secondary order of a collation order. +* @param order the collation order +* @return the secondary order of a collation order. +* @stable ICU 2.6 +*/ +U_CAPI int32_t U_EXPORT2 +ucol_secondaryOrder (int32_t order); + +/** +* Get the tertiary order of a collation order. +* @param order the collation order +* @return the tertiary order of a collation order. +* @stable ICU 2.6 +*/ +U_CAPI int32_t U_EXPORT2 +ucol_tertiaryOrder (int32_t order); + +#endif /* #if !UCONFIG_NO_COLLATION */ + +#endif |