316 lines
12 KiB
C
316 lines
12 KiB
C
/*
|
|
*******************************************************************************
|
|
* Copyright (C) 2001-2008, International Business Machines
|
|
* Corporation and others. All Rights Reserved.
|
|
*******************************************************************************
|
|
*
|
|
* File ucoleitr.cpp
|
|
*
|
|
* 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 occured during processing or if no more CEs is
|
|
* to be returned.
|
|
* @stable ICU 2.0
|
|
*/
|
|
#define UCOL_NULLORDER ((int32_t)0xFFFFFFFF)
|
|
|
|
/**
|
|
* This indicates an error has occured during processing or there are no more CEs
|
|
* to be returned.
|
|
*
|
|
* @internal
|
|
*/
|
|
#define UCOL_PROCESSED_NULLORDER ((int64_t)U_INT64_MAX)
|
|
|
|
#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 Spanish:
|
|
* <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,
|
|
* <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;
|
|
* . s=(UChar*)malloc(sizeof(UChar) * (strlen("This is a test")+1) );
|
|
* . u_uastrcpy(s, "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(s);
|
|
* . 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 UCOL_IGNORABLE 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>t_int32</strong>.
|
|
*
|
|
* @see UCollator
|
|
*/
|
|
|
|
/**
|
|
* Open the collation elements for a string.
|
|
*
|
|
* @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 an UErrorCode to receive any errors.
|
|
* @return a struct containing collation element information
|
|
* @stable ICU 2.0
|
|
*/
|
|
U_STABLE 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_STABLE 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_STABLE 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_STABLE 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 an UErrorCode to receive any errors.
|
|
* @return The next collation elements ordering, otherwise returns NULLORDER
|
|
* if an error has occured or if the end of string has been reached
|
|
* @stable ICU 2.0
|
|
*/
|
|
U_STABLE 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.
|
|
* It is very rare that the stack will overflow, however if such a case is
|
|
* encountered, the problem can be solved by increasing the size
|
|
* UCOL_EXPAND_CE_BUFFER_SIZE in ucol_imp.h.
|
|
* @param elems The UCollationElements containing the text.
|
|
* @param status A pointer to an UErrorCode to receive any errors. Noteably
|
|
* a U_BUFFER_OVERFLOW_ERROR is returned if the internal stack
|
|
* buffer has been exhausted.
|
|
* @return The previous collation elements ordering, otherwise returns
|
|
* NULLORDER if an error has occured or if the start of string has
|
|
* been reached.
|
|
* @stable ICU 2.0
|
|
*/
|
|
U_STABLE int32_t U_EXPORT2
|
|
ucol_previous(UCollationElements *elems, UErrorCode *status);
|
|
|
|
/**
|
|
* Get the processed 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 ixLow a pointer to an int32_t to receive the iterator index before fetching the CE.
|
|
* @param ixHigh a pointer to an int32_t to receive the iterator index after fetching the CE.
|
|
* @param status A pointer to an UErrorCode to receive any errors.
|
|
* @return The next collation elements ordering, otherwise returns UCOL_PROCESSED_NULLORDER
|
|
* if an error has occured or if the end of string has been reached
|
|
*
|
|
* @internal
|
|
*/
|
|
U_INTERNAL int64_t U_EXPORT2
|
|
ucol_nextProcessed(UCollationElements *elems, int32_t *ixLow, int32_t *ixHigh, UErrorCode *status);
|
|
|
|
/**
|
|
* Get the processed 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.
|
|
* It is very rare that the stack will overflow, however if such a case is
|
|
* encountered, the problem can be solved by increasing the size
|
|
* UCOL_EXPAND_CE_BUFFER_SIZE in ucol_imp.h.
|
|
*
|
|
* @param elems The UCollationElements containing the text.
|
|
* @param ixLow A pointer to an int32_t to receive the iterator index after fetching the CE
|
|
* @param ixHigh A pointer to an int32_t to receiver the iterator index before fetching the CE
|
|
* @param status A pointer to an UErrorCode to receive any errors. Noteably
|
|
* a U_BUFFER_OVERFLOW_ERROR is returned if the internal stack
|
|
* buffer has been exhausted.
|
|
* @return The previous collation elements ordering, otherwise returns
|
|
* UCOL_PROCESSED_NULLORDER if an error has occured or if the start of
|
|
* string has been reached.
|
|
*
|
|
* @internal
|
|
*/
|
|
U_INTERNAL int64_t U_EXPORT2
|
|
ucol_previousProcessed(UCollationElements *elems, int32_t *ixLow, int32_t *ixHigh, 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_STABLE 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.
|
|
* @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 an UErrorCode to receive any errors.
|
|
* @see ucol_getText
|
|
* @stable ICU 2.0
|
|
*/
|
|
U_STABLE 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_STABLE 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 an UErrorCode to receive any errors.
|
|
* @see ucol_getOffset
|
|
* @stable ICU 2.0
|
|
*/
|
|
U_STABLE 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_STABLE 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_STABLE 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_STABLE int32_t U_EXPORT2
|
|
ucol_tertiaryOrder (int32_t order);
|
|
|
|
#endif /* #if !UCONFIG_NO_COLLATION */
|
|
|
|
#endif
|