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