/usr/include/unicode/utrans.h (23129B)
After a transliteration operation, some of the indices in this * structure will be modified. See the field descriptions for * details. * *
contextStart <= start <= limit <= contextLimit * *
Note: All index values in this structure must be at code point * boundaries. That is, none of them may occur between two code units * of a surrogate pair. If any index does split a surrogate pair, * results are unspecified. * * @stable ICU 2.0 */ typedef struct UTransPosition { /** * Beginning index, inclusive, of the context to be considered for * a transliteration operation. The transliterator will ignore * anything before this index. INPUT/OUTPUT parameter: This parameter * is updated by a transliteration operation to reflect the maximum * amount of antecontext needed by a transliterator. * @stable ICU 2.4 */ int32_t contextStart; /** * Ending index, exclusive, of the context to be considered for a * transliteration operation. The transliterator will ignore * anything at or after this index. INPUT/OUTPUT parameter: This * parameter is updated to reflect changes in the length of the * text, but points to the same logical position in the text. * @stable ICU 2.4 */ int32_t contextLimit; /** * Beginning index, inclusive, of the text to be transliteratd. * INPUT/OUTPUT parameter: This parameter is advanced past * characters that have already been transliterated by a * transliteration operation. * @stable ICU 2.4 */ int32_t start; /** * Ending index, exclusive, of the text to be transliteratd. * INPUT/OUTPUT parameter: This parameter is updated to reflect * changes in the length of the text, but points to the same * logical position in the text. * @stable ICU 2.4 */ int32_t limit; } UTransPosition; /******************************************************************** * General API ********************************************************************/ /** * Open a custom transliterator, given a custom rules string * OR * a system transliterator, given its ID. * Any non-NULL result from this function should later be closed with * utrans_close(). * * @param id a valid transliterator ID * @param idLength the length of the ID string, or -1 if NUL-terminated * @param dir the desired direction * @param rules the transliterator rules. See the C++ header rbt.h for * rules syntax. If NULL then a system transliterator matching * the ID is returned. * @param rulesLength the length of the rules, or -1 if the rules * are NUL-terminated. * @param parseError a pointer to a UParseError struct to receive the details * of any parsing errors. This parameter may be NULL if no * parsing error details are desired. * @param pErrorCode a pointer to the UErrorCode * @return a transliterator pointer that may be passed to other * utrans_xxx() functions, or NULL if the open call fails. * @stable ICU 2.8 */ U_STABLE UTransliterator* U_EXPORT2 utrans_openU(const UChar *id, int32_t idLength, UTransDirection dir, const UChar *rules, int32_t rulesLength, UParseError *parseError, UErrorCode *pErrorCode); /** * Open an inverse of an existing transliterator. For this to work, * the inverse must be registered with the system. For example, if * the Transliterator "A-B" is opened, and then its inverse is opened, * the result is the Transliterator "B-A", if such a transliterator is * registered with the system. Otherwise the result is NULL and a * failing UErrorCode is set. Any non-NULL result from this function * should later be closed with utrans_close(). * * @param trans the transliterator to open the inverse of. * @param status a pointer to the UErrorCode * @return a pointer to a newly-opened transliterator that is the * inverse of trans, or NULL if the open call fails. * @stable ICU 2.0 */ U_STABLE UTransliterator* U_EXPORT2 utrans_openInverse(const UTransliterator* trans, UErrorCode* status); /** * Create a copy of a transliterator. Any non-NULL result from this * function should later be closed with utrans_close(). * * @param trans the transliterator to be copied. * @param status a pointer to the UErrorCode * @return a transliterator pointer that may be passed to other * utrans_xxx() functions, or NULL if the clone call fails. * @stable ICU 2.0 */ U_STABLE UTransliterator* U_EXPORT2 utrans_clone(const UTransliterator* trans, UErrorCode* status); /** * Close a transliterator. Any non-NULL pointer returned by * utrans_openXxx() or utrans_clone() should eventually be closed. * @param trans the transliterator to be closed. * @stable ICU 2.0 */ U_STABLE void U_EXPORT2 utrans_close(UTransliterator* trans); /** * Return the programmatic identifier for this transliterator. * If this identifier is passed to utrans_openU(), it will open * a transliterator equivalent to this one, if the ID has been * registered. * * @param trans the transliterator to return the ID of. * @param resultLength pointer to an output variable receiving the length * of the ID string; can be NULL * @return the NUL-terminated ID string. This pointer remains * valid until utrans_close() is called on this transliterator. * * @stable ICU 2.8 */ U_STABLE const UChar * U_EXPORT2 utrans_getUnicodeID(const UTransliterator *trans, int32_t *resultLength); /** * Register an open transliterator with the system. When * utrans_open() is called with an ID string that is equal to that * returned by utrans_getID(adoptedTrans,...), then * utrans_clone(adoptedTrans,...) is returned. * *
NOTE: After this call the system owns the adoptedTrans and will
* close it. The user must not call utrans_close() on adoptedTrans.
*
* @param adoptedTrans a transliterator, typically the result of
* utrans_openRules(), to be registered with the system.
* @param status a pointer to the UErrorCode
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
utrans_register(UTransliterator* adoptedTrans,
UErrorCode* status);
/**
* Unregister a transliterator from the system. After this call the
* system will no longer recognize the given ID when passed to
* utrans_open(). If the ID is invalid then nothing is done.
*
* @param id an ID to unregister
* @param idLength the length of id, or -1 if id is zero-terminated
* @stable ICU 2.8
*/
U_STABLE void U_EXPORT2
utrans_unregisterID(const UChar* id, int32_t idLength);
/**
* Set the filter used by a transliterator. A filter can be used to
* make the transliterator pass certain characters through untouched.
* The filter is expressed using a UnicodeSet pattern. If the
* filterPattern is NULL or the empty string, then the transliterator
* will be reset to use no filter.
*
* @param trans the transliterator
* @param filterPattern a pattern string, in the form accepted by
* UnicodeSet, specifying which characters to apply the
* transliteration to. May be NULL or the empty string to indicate no
* filter.
* @param filterPatternLen the length of filterPattern, or -1 if
* filterPattern is zero-terminated
* @param status a pointer to the UErrorCode
* @see UnicodeSet
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
utrans_setFilter(UTransliterator* trans,
const UChar* filterPattern,
int32_t filterPatternLen,
UErrorCode* status);
/**
* Return the number of system transliterators.
* It is recommended to use utrans_openIDs() instead.
*
* @return the number of system transliterators.
* @stable ICU 2.0
*/
U_STABLE int32_t U_EXPORT2
utrans_countAvailableIDs(void);
/**
* Return a UEnumeration for the available transliterators.
*
* @param pErrorCode Pointer to the UErrorCode in/out parameter.
* @return UEnumeration for the available transliterators.
* Close with uenum_close().
*
* @stable ICU 2.8
*/
U_STABLE UEnumeration * U_EXPORT2
utrans_openIDs(UErrorCode *pErrorCode);
/********************************************************************
* Transliteration API
********************************************************************/
/**
* Transliterate a segment of a UReplaceable string. The string is
* passed in as a UReplaceable pointer rep and a UReplaceableCallbacks
* function pointer struct repFunc. Functions in the repFunc struct
* will be called in order to modify the rep string.
*
* @param trans the transliterator
* @param rep a pointer to the string. This will be passed to the
* repFunc functions.
* @param repFunc a set of function pointers that will be used to
* modify the string pointed to by rep.
* @param start the beginning index, inclusive; 0 <= start <=
* limit.
* @param limit pointer to the ending index, exclusive; start <=
* limit <= repFunc->length(rep). Upon return, *limit will
* contain the new limit index. The text previously occupying
* [start, limit) has been transliterated, possibly to a
* string of a different length, at [start,
* new-limit), where new-limit
* is the return value.
* @param status a pointer to the UErrorCode
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
utrans_trans(const UTransliterator* trans,
UReplaceable* rep,
UReplaceableCallbacks* repFunc,
int32_t start,
int32_t* limit,
UErrorCode* status);
/**
* Transliterate the portion of the UReplaceable text buffer that can
* be transliterated unambiguosly. This method is typically called
* after new text has been inserted, e.g. as a result of a keyboard
* event. The transliterator will try to transliterate characters of
* rep between index.cursor and
* index.limit. Characters before
* index.cursor will not be changed.
*
*
Upon return, values in index will be updated.
* index.start will be advanced to the first
* character that future calls to this method will read.
* index.cursor and index.limit will
* be adjusted to delimit the range of text that future calls to
* this method may change.
*
*
Typical usage of this method begins with an initial call
* with index.start and index.limit
* set to indicate the portion of text to be
* transliterated, and index.cursor == index.start.
* Thereafter, index can be used without
* modification in future calls, provided that all changes to
* text are made via this method.
*
*
This method assumes that future calls may be made that will
* insert new text into the buffer. As a result, it only performs
* unambiguous transliterations. After the last call to this method,
* there may be untransliterated text that is waiting for more input
* to resolve an ambiguity. In order to perform these pending
* transliterations, clients should call utrans_trans() with a start
* of index.start and a limit of index.end after the last call to this
* method has been made.
*
* @param trans the transliterator
* @param rep a pointer to the string. This will be passed to the
* repFunc functions.
* @param repFunc a set of function pointers that will be used to
* modify the string pointed to by rep.
* @param pos a struct containing the start and limit indices of the
* text to be read and the text to be transliterated
* @param status a pointer to the UErrorCode
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
utrans_transIncremental(const UTransliterator* trans,
UReplaceable* rep,
UReplaceableCallbacks* repFunc,
UTransPosition* pos,
UErrorCode* status);
/**
* Transliterate a segment of a UChar* string. The string is passed
* in in a UChar* buffer. The string is modified in place. If the
* result is longer than textCapacity, it is truncated. The actual
* length of the result is returned in *textLength, if textLength is
* non-NULL. *textLength may be greater than textCapacity, but only
* textCapacity UChars will be written to *text, including the zero
* terminator.
*
* @param trans the transliterator
* @param text a pointer to a buffer containing the text to be
* transliterated on input and the result text on output.
* @param textLength a pointer to the length of the string in text.
* If the length is -1 then the string is assumed to be
* zero-terminated. Upon return, the new length is stored in
* *textLength. If textLength is NULL then the string is assumed to
* be zero-terminated.
* @param textCapacity a pointer to the length of the text buffer.
* Upon return,
* @param start the beginning index, inclusive; 0 <= start <=
* limit.
* @param limit pointer to the ending index, exclusive; start <=
* limit <= repFunc->length(rep). Upon return, *limit will
* contain the new limit index. The text previously occupying
* [start, limit) has been transliterated, possibly to a
* string of a different length, at [start,
* new-limit), where new-limit
* is the return value.
* @param status a pointer to the UErrorCode
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
utrans_transUChars(const UTransliterator* trans,
UChar* text,
int32_t* textLength,
int32_t textCapacity,
int32_t start,
int32_t* limit,
UErrorCode* status);
/**
* Transliterate the portion of the UChar* text buffer that can be
* transliterated unambiguosly. See utrans_transIncremental(). The
* string is passed in in a UChar* buffer. The string is modified in
* place. If the result is longer than textCapacity, it is truncated.
* The actual length of the result is returned in *textLength, if
* textLength is non-NULL. *textLength may be greater than
* textCapacity, but only textCapacity UChars will be written to
* *text, including the zero terminator. See utrans_transIncremental()
* for usage details.
*
* @param trans the transliterator
* @param text a pointer to a buffer containing the text to be
* transliterated on input and the result text on output.
* @param textLength a pointer to the length of the string in text.
* If the length is -1 then the string is assumed to be
* zero-terminated. Upon return, the new length is stored in
* *textLength. If textLength is NULL then the string is assumed to
* be zero-terminated.
* @param textCapacity the length of the text buffer
* @param pos a struct containing the start and limit indices of the
* text to be read and the text to be transliterated
* @param status a pointer to the UErrorCode
* @see utrans_transIncremental
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
utrans_transIncrementalUChars(const UTransliterator* trans,
UChar* text,
int32_t* textLength,
int32_t textCapacity,
UTransPosition* pos,
UErrorCode* status);
/* deprecated API ----------------------------------------------------------- */
/* see utrans.h documentation for why these functions are deprecated */
/**
* Deprecated, use utrans_openU() instead.
* Open a custom transliterator, given a custom rules string
* OR
* a system transliterator, given its ID.
* Any non-NULL result from this function should later be closed with
* utrans_close().
*
* @param id a valid ID, as returned by utrans_getAvailableID()
* @param dir the desired direction
* @param rules the transliterator rules. See the C++ header rbt.h
* for rules syntax. If NULL then a system transliterator matching
* the ID is returned.
* @param rulesLength the length of the rules, or -1 if the rules
* are zero-terminated.
* @param parseError a pointer to a UParseError struct to receive the
* details of any parsing errors. This parameter may be NULL if no
* parsing error details are desired.
* @param status a pointer to the UErrorCode
* @return a transliterator pointer that may be passed to other
* utrans_xxx() functions, or NULL if the open call fails.
* @deprecated ICU 2.8 Use utrans_openU() instead, see utrans.h
*/
U_DEPRECATED UTransliterator* U_EXPORT2
utrans_open(const char* id,
UTransDirection dir,
const UChar* rules, /* may be Null */
int32_t rulesLength, /* -1 if null-terminated */
UParseError* parseError, /* may be Null */
UErrorCode* status);
/**
* Deprecated, use utrans_getUnicodeID() instead.
* Return the programmatic identifier for this transliterator.
* If this identifier is passed to utrans_open(), it will open
* a transliterator equivalent to this one, if the ID has been
* registered.
* @param trans the transliterator to return the ID of.
* @param buf the buffer in which to receive the ID. This may be
* NULL, in which case no characters are copied.
* @param bufCapacity the capacity of the buffer. Ignored if buf is
* NULL.
* @return the actual length of the ID, not including
* zero-termination. This may be greater than bufCapacity.
* @deprecated ICU 2.8 Use utrans_getUnicodeID() instead, see utrans.h
*/
U_DEPRECATED int32_t U_EXPORT2
utrans_getID(const UTransliterator* trans,
char* buf,
int32_t bufCapacity);
/**
* Deprecated, use utrans_unregisterID() instead.
* Unregister a transliterator from the system. After this call the
* system will no longer recognize the given ID when passed to
* utrans_open(). If the id is invalid then nothing is done.
*
* @param id a zero-terminated ID
* @deprecated ICU 2.8 Use utrans_unregisterID() instead, see utrans.h
*/
U_DEPRECATED void U_EXPORT2
utrans_unregister(const char* id);
/**
* Deprecated, use utrans_openIDs() instead.
* Return the ID of the index-th system transliterator. The result
* is placed in the given buffer. If the given buffer is too small,
* the initial substring is copied to buf. The result in buf is
* always zero-terminated.
*
* @param index the number of the transliterator to return. Must
* satisfy 0 <= index < utrans_countAvailableIDs(). If index is out
* of range then it is treated as if it were 0.
* @param buf the buffer in which to receive the ID. This may be
* NULL, in which case no characters are copied.
* @param bufCapacity the capacity of the buffer. Ignored if buf is
* NULL.
* @return the actual length of the index-th ID, not including
* zero-termination. This may be greater than bufCapacity.
* @deprecated ICU 2.8 Use utrans_openIDs() instead, see utrans.h
*/
U_DEPRECATED int32_t U_EXPORT2
utrans_getAvailableID(int32_t index,
char* buf,
int32_t bufCapacity);
#endif /* #if !UCONFIG_NO_TRANSLITERATION */
#endif