5098ba1b94
* Remove 4.2 sourcecode * ICU is now an optional package (mandatory) * Adjust the namespaces and libraries names where needed git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37498 a95241bf-73f2-0310-859d-f6bbb57e9c96
604 lines
23 KiB
C
604 lines
23 KiB
C
/*
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*******************************************************************************
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* Copyright (C) 1997-2009, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* Date Name Description
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* 06/21/00 aliu Creation.
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*******************************************************************************
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*/
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#ifndef UTRANS_H
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#define UTRANS_H
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_TRANSLITERATION
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#include "unicode/localpointer.h"
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#include "unicode/urep.h"
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#include "unicode/parseerr.h"
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#include "unicode/uenum.h"
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/********************************************************************
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* General Notes
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********************************************************************
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*/
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/**
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* \file
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* \brief C API: Transliterator
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*
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* <h2> Transliteration </h2>
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* The data structures and functions described in this header provide
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* transliteration services. Transliteration services are implemented
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* as C++ classes. The comments and documentation in this header
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* assume the reader is familiar with the C++ headers translit.h and
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* associated documentation.
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*
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* A significant but incomplete subset of the C++ transliteration
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* services are available to C code through this header. In order to
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* access more complex transliteration services, refer to the C++
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* headers and documentation.
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*
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* There are two sets of functions for working with transliterator IDs:
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*
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* An old, deprecated set uses char * IDs, which works for true and pure
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* identifiers that these APIs were designed for,
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* for example "Cyrillic-Latin".
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* It does not work when the ID contains filters ("[:Script=Cyrl:]")
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* or even a complete set of rules because then the ID string contains more
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* than just "invariant" characters (see utypes.h).
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*
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* A new set of functions replaces the old ones and uses UChar * IDs,
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* paralleling the UnicodeString IDs in the C++ API. (New in ICU 2.8.)
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*/
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/********************************************************************
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* Data Structures
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********************************************************************/
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/**
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* An opaque transliterator for use in C. Open with utrans_openxxx()
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* and close with utrans_close() when done. Equivalent to the C++ class
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* Transliterator and its subclasses.
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* @see Transliterator
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* @stable ICU 2.0
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*/
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typedef void* UTransliterator;
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/**
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* Direction constant indicating the direction in a transliterator,
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* e.g., the forward or reverse rules of a RuleBasedTransliterator.
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* Specified when a transliterator is opened. An "A-B" transliterator
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* transliterates A to B when operating in the forward direction, and
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* B to A when operating in the reverse direction.
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* @stable ICU 2.0
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*/
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typedef enum UTransDirection {
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/**
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* UTRANS_FORWARD means from <source> to <target> for a
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* transliterator with ID <source>-<target>. For a transliterator
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* opened using a rule, it means forward direction rules, e.g.,
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* "A > B".
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*/
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UTRANS_FORWARD,
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/**
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* UTRANS_REVERSE means from <target> to <source> for a
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* transliterator with ID <source>-<target>. For a transliterator
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* opened using a rule, it means reverse direction rules, e.g.,
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* "A < B".
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*/
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UTRANS_REVERSE
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} UTransDirection;
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/**
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* Position structure for utrans_transIncremental() incremental
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* transliteration. This structure defines two substrings of the text
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* being transliterated. The first region, [contextStart,
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* contextLimit), defines what characters the transliterator will read
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* as context. The second region, [start, limit), defines what
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* characters will actually be transliterated. The second region
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* should be a subset of the first.
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*
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* <p>After a transliteration operation, some of the indices in this
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* structure will be modified. See the field descriptions for
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* details.
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*
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* <p>contextStart <= start <= limit <= contextLimit
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*
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* <p>Note: All index values in this structure must be at code point
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* boundaries. That is, none of them may occur between two code units
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* of a surrogate pair. If any index does split a surrogate pair,
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* results are unspecified.
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*
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* @stable ICU 2.0
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*/
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typedef struct UTransPosition {
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/**
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* Beginning index, inclusive, of the context to be considered for
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* a transliteration operation. The transliterator will ignore
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* anything before this index. INPUT/OUTPUT parameter: This parameter
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* is updated by a transliteration operation to reflect the maximum
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* amount of antecontext needed by a transliterator.
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* @stable ICU 2.4
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*/
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int32_t contextStart;
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/**
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* Ending index, exclusive, of the context to be considered for a
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* transliteration operation. The transliterator will ignore
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* anything at or after this index. INPUT/OUTPUT parameter: This
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* parameter is updated to reflect changes in the length of the
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* text, but points to the same logical position in the text.
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* @stable ICU 2.4
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*/
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int32_t contextLimit;
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/**
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* Beginning index, inclusive, of the text to be transliteratd.
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* INPUT/OUTPUT parameter: This parameter is advanced past
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* characters that have already been transliterated by a
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* transliteration operation.
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* @stable ICU 2.4
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*/
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int32_t start;
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/**
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* Ending index, exclusive, of the text to be transliteratd.
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* INPUT/OUTPUT parameter: This parameter is updated to reflect
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* changes in the length of the text, but points to the same
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* logical position in the text.
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* @stable ICU 2.4
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*/
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int32_t limit;
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} UTransPosition;
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/********************************************************************
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* General API
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********************************************************************/
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/**
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* Open a custom transliterator, given a custom rules string
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* OR
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* a system transliterator, given its ID.
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* Any non-NULL result from this function should later be closed with
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* utrans_close().
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*
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* @param id a valid transliterator ID
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* @param idLength the length of the ID string, or -1 if NUL-terminated
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* @param dir the desired direction
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* @param rules the transliterator rules. See the C++ header rbt.h for
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* rules syntax. If NULL then a system transliterator matching
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* the ID is returned.
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* @param rulesLength the length of the rules, or -1 if the rules
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* are NUL-terminated.
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* @param parseError a pointer to a UParseError struct to receive the details
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* of any parsing errors. This parameter may be NULL if no
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* parsing error details are desired.
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* @param pErrorCode a pointer to the UErrorCode
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* @return a transliterator pointer that may be passed to other
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* utrans_xxx() functions, or NULL if the open call fails.
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* @stable ICU 2.8
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*/
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U_STABLE UTransliterator* U_EXPORT2
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utrans_openU(const UChar *id,
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int32_t idLength,
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UTransDirection dir,
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const UChar *rules,
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int32_t rulesLength,
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UParseError *parseError,
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UErrorCode *pErrorCode);
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/**
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* Open an inverse of an existing transliterator. For this to work,
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* the inverse must be registered with the system. For example, if
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* the Transliterator "A-B" is opened, and then its inverse is opened,
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* the result is the Transliterator "B-A", if such a transliterator is
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* registered with the system. Otherwise the result is NULL and a
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* failing UErrorCode is set. Any non-NULL result from this function
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* should later be closed with utrans_close().
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*
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* @param trans the transliterator to open the inverse of.
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* @param status a pointer to the UErrorCode
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* @return a pointer to a newly-opened transliterator that is the
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* inverse of trans, or NULL if the open call fails.
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* @stable ICU 2.0
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*/
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U_STABLE UTransliterator* U_EXPORT2
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utrans_openInverse(const UTransliterator* trans,
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UErrorCode* status);
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/**
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* Create a copy of a transliterator. Any non-NULL result from this
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* function should later be closed with utrans_close().
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*
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* @param trans the transliterator to be copied.
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* @param status a pointer to the UErrorCode
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* @return a transliterator pointer that may be passed to other
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* utrans_xxx() functions, or NULL if the clone call fails.
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* @stable ICU 2.0
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*/
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U_STABLE UTransliterator* U_EXPORT2
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utrans_clone(const UTransliterator* trans,
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UErrorCode* status);
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/**
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* Close a transliterator. Any non-NULL pointer returned by
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* utrans_openXxx() or utrans_clone() should eventually be closed.
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* @param trans the transliterator to be closed.
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* @stable ICU 2.0
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*/
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U_STABLE void U_EXPORT2
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utrans_close(UTransliterator* trans);
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#if U_SHOW_CPLUSPLUS_API
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U_NAMESPACE_BEGIN
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/**
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* \class LocalUTransliteratorPointer
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* "Smart pointer" class, closes a UTransliterator via utrans_close().
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* For most methods see the LocalPointerBase base class.
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*
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* @see LocalPointerBase
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* @see LocalPointer
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* @draft ICU 4.4
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*/
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U_DEFINE_LOCAL_OPEN_POINTER(LocalUTransliteratorPointer, UTransliterator, utrans_close);
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U_NAMESPACE_END
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#endif
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/**
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* Return the programmatic identifier for this transliterator.
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* If this identifier is passed to utrans_openU(), it will open
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* a transliterator equivalent to this one, if the ID has been
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* registered.
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*
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* @param trans the transliterator to return the ID of.
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* @param resultLength pointer to an output variable receiving the length
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* of the ID string; can be NULL
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* @return the NUL-terminated ID string. This pointer remains
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* valid until utrans_close() is called on this transliterator.
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*
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* @stable ICU 2.8
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*/
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U_STABLE const UChar * U_EXPORT2
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utrans_getUnicodeID(const UTransliterator *trans,
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int32_t *resultLength);
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/**
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* Register an open transliterator with the system. When
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* utrans_open() is called with an ID string that is equal to that
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* returned by utrans_getID(adoptedTrans,...), then
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* utrans_clone(adoptedTrans,...) is returned.
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*
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* <p>NOTE: After this call the system owns the adoptedTrans and will
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* close it. The user must not call utrans_close() on adoptedTrans.
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*
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* @param adoptedTrans a transliterator, typically the result of
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* utrans_openRules(), to be registered with the system.
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* @param status a pointer to the UErrorCode
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* @stable ICU 2.0
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*/
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U_STABLE void U_EXPORT2
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utrans_register(UTransliterator* adoptedTrans,
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UErrorCode* status);
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/**
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* Unregister a transliterator from the system. After this call the
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* system will no longer recognize the given ID when passed to
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* utrans_open(). If the ID is invalid then nothing is done.
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*
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* @param id an ID to unregister
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* @param idLength the length of id, or -1 if id is zero-terminated
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* @stable ICU 2.8
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*/
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U_STABLE void U_EXPORT2
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utrans_unregisterID(const UChar* id, int32_t idLength);
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/**
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* Set the filter used by a transliterator. A filter can be used to
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* make the transliterator pass certain characters through untouched.
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* The filter is expressed using a UnicodeSet pattern. If the
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* filterPattern is NULL or the empty string, then the transliterator
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* will be reset to use no filter.
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*
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* @param trans the transliterator
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* @param filterPattern a pattern string, in the form accepted by
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* UnicodeSet, specifying which characters to apply the
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* transliteration to. May be NULL or the empty string to indicate no
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* filter.
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* @param filterPatternLen the length of filterPattern, or -1 if
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* filterPattern is zero-terminated
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* @param status a pointer to the UErrorCode
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* @see UnicodeSet
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* @stable ICU 2.0
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*/
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U_STABLE void U_EXPORT2
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utrans_setFilter(UTransliterator* trans,
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const UChar* filterPattern,
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int32_t filterPatternLen,
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UErrorCode* status);
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/**
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* Return the number of system transliterators.
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* It is recommended to use utrans_openIDs() instead.
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*
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* @return the number of system transliterators.
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* @stable ICU 2.0
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*/
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U_STABLE int32_t U_EXPORT2
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utrans_countAvailableIDs(void);
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/**
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* Return a UEnumeration for the available transliterators.
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*
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* @param pErrorCode Pointer to the UErrorCode in/out parameter.
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* @return UEnumeration for the available transliterators.
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* Close with uenum_close().
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*
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* @stable ICU 2.8
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*/
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U_STABLE UEnumeration * U_EXPORT2
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utrans_openIDs(UErrorCode *pErrorCode);
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/********************************************************************
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* Transliteration API
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********************************************************************/
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/**
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* Transliterate a segment of a UReplaceable string. The string is
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* passed in as a UReplaceable pointer rep and a UReplaceableCallbacks
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* function pointer struct repFunc. Functions in the repFunc struct
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* will be called in order to modify the rep string.
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*
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* @param trans the transliterator
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* @param rep a pointer to the string. This will be passed to the
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* repFunc functions.
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* @param repFunc a set of function pointers that will be used to
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* modify the string pointed to by rep.
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* @param start the beginning index, inclusive; <code>0 <= start <=
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* limit</code>.
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* @param limit pointer to the ending index, exclusive; <code>start <=
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* limit <= repFunc->length(rep)</code>. Upon return, *limit will
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* contain the new limit index. The text previously occupying
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* <code>[start, limit)</code> has been transliterated, possibly to a
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* string of a different length, at <code>[start,
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* </code><em>new-limit</em><code>)</code>, where <em>new-limit</em>
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* is the return value.
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* @param status a pointer to the UErrorCode
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* @stable ICU 2.0
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*/
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U_STABLE void U_EXPORT2
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utrans_trans(const UTransliterator* trans,
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UReplaceable* rep,
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UReplaceableCallbacks* repFunc,
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int32_t start,
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int32_t* limit,
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UErrorCode* status);
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/**
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* Transliterate the portion of the UReplaceable text buffer that can
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* be transliterated unambiguosly. This method is typically called
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* after new text has been inserted, e.g. as a result of a keyboard
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* event. The transliterator will try to transliterate characters of
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* <code>rep</code> between <code>index.cursor</code> and
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* <code>index.limit</code>. Characters before
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* <code>index.cursor</code> will not be changed.
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*
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* <p>Upon return, values in <code>index</code> will be updated.
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* <code>index.start</code> will be advanced to the first
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* character that future calls to this method will read.
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* <code>index.cursor</code> and <code>index.limit</code> will
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* be adjusted to delimit the range of text that future calls to
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* this method may change.
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*
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* <p>Typical usage of this method begins with an initial call
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* with <code>index.start</code> and <code>index.limit</code>
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* set to indicate the portion of <code>text</code> to be
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* transliterated, and <code>index.cursor == index.start</code>.
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* Thereafter, <code>index</code> can be used without
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* modification in future calls, provided that all changes to
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* <code>text</code> are made via this method.
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*
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* <p>This method assumes that future calls may be made that will
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* insert new text into the buffer. As a result, it only performs
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* unambiguous transliterations. After the last call to this method,
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* there may be untransliterated text that is waiting for more input
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* to resolve an ambiguity. In order to perform these pending
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* transliterations, clients should call utrans_trans() with a start
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* of index.start and a limit of index.end after the last call to this
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* method has been made.
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*
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* @param trans the transliterator
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* @param rep a pointer to the string. This will be passed to the
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* repFunc functions.
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* @param repFunc a set of function pointers that will be used to
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* modify the string pointed to by rep.
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* @param pos a struct containing the start and limit indices of the
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* text to be read and the text to be transliterated
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* @param status a pointer to the UErrorCode
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* @stable ICU 2.0
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*/
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U_STABLE void U_EXPORT2
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utrans_transIncremental(const UTransliterator* trans,
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UReplaceable* rep,
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UReplaceableCallbacks* repFunc,
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UTransPosition* pos,
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UErrorCode* status);
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/**
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* Transliterate a segment of a UChar* string. The string is passed
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* in in a UChar* buffer. The string is modified in place. If the
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* result is longer than textCapacity, it is truncated. The actual
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* length of the result is returned in *textLength, if textLength is
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* non-NULL. *textLength may be greater than textCapacity, but only
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* textCapacity UChars will be written to *text, including the zero
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* terminator.
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*
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* @param trans the transliterator
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* @param text a pointer to a buffer containing the text to be
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* transliterated on input and the result text on output.
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* @param textLength a pointer to the length of the string in text.
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* If the length is -1 then the string is assumed to be
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* zero-terminated. Upon return, the new length is stored in
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* *textLength. If textLength is NULL then the string is assumed to
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* be zero-terminated.
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* @param textCapacity a pointer to the length of the text buffer.
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* Upon return,
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* @param start the beginning index, inclusive; <code>0 <= start <=
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* limit</code>.
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* @param limit pointer to the ending index, exclusive; <code>start <=
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* limit <= repFunc->length(rep)</code>. Upon return, *limit will
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* contain the new limit index. The text previously occupying
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* <code>[start, limit)</code> has been transliterated, possibly to a
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* string of a different length, at <code>[start,
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* </code><em>new-limit</em><code>)</code>, where <em>new-limit</em>
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* is the return value.
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* @param status a pointer to the UErrorCode
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* @stable ICU 2.0
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*/
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U_STABLE void U_EXPORT2
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utrans_transUChars(const UTransliterator* trans,
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UChar* text,
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int32_t* textLength,
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int32_t textCapacity,
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int32_t start,
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int32_t* limit,
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UErrorCode* status);
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/**
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* Transliterate the portion of the UChar* text buffer that can be
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* transliterated unambiguosly. See utrans_transIncremental(). The
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* string is passed in in a UChar* buffer. The string is modified in
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* place. If the result is longer than textCapacity, it is truncated.
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* The actual length of the result is returned in *textLength, if
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* textLength is non-NULL. *textLength may be greater than
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* textCapacity, but only textCapacity UChars will be written to
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* *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
|