// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
* Copyright (C) 1997-2010, International Business Machines
* Corporation and others. All Rights Reserved.
******************************************************************************
* Date Name Description
* 06/23/00 aliu Creation.
******************************************************************************
*/
#ifndef __UREP_H
#define __UREP_H
#include "unicode/utypes.h"
U_CDECL_BEGIN
/********************************************************************
* General Notes
********************************************************************
* TODO
* Add usage scenario
* Add test code
* Talk about pinning
* Talk about "can truncate result if out of memory"
*/
/********************************************************************
* Data Structures
********************************************************************/
/**
* \file
* \brief C API: Callbacks for UReplaceable
*/
/**
* An opaque replaceable text object. This will be manipulated only
* through the caller-supplied UReplaceableFunctor struct. Related
* to the C++ class Replaceable.
* This is currently only used in the Transliterator C API, see utrans.h .
* @stable ICU 2.0
*/
typedef void* UReplaceable;
/**
* A set of function pointers that transliterators use to manipulate a
* UReplaceable. The caller should supply the required functions to
* manipulate their text appropriately. Related to the C++ class
* Replaceable.
* @stable ICU 2.0
*/
typedef struct UReplaceableCallbacks {
/**
* Function pointer that returns the number of UChar code units in
* this text.
*
* @param rep A pointer to "this" UReplaceable object.
* @return The length of the text.
* @stable ICU 2.0
*/
int32_t (*length)(const UReplaceable* rep);
/**
* Function pointer that returns a UChar code units at the given
* offset into this text; 0 <= offset < n, where n is the value
* returned by (*length)(rep). See unistr.h for a description of
* charAt() vs. char32At().
*
* @param rep A pointer to "this" UReplaceable object.
* @param offset The index at which to fetch the UChar (code unit).
* @return The UChar (code unit) at offset, or U+FFFF if the offset is out of bounds.
* @stable ICU 2.0
*/
UChar (*charAt)(const UReplaceable* rep,
int32_t offset);
/**
* Function pointer that returns a UChar32 code point at the given
* offset into this text. See unistr.h for a description of
* charAt() vs. char32At().
*
* @param rep A pointer to "this" UReplaceable object.
* @param offset The index at which to fetch the UChar32 (code point).
* @return The UChar32 (code point) at offset, or U+FFFF if the offset is out of bounds.
* @stable ICU 2.0
*/
UChar32 (*char32At)(const UReplaceable* rep,
int32_t offset);
/**
* Function pointer that replaces text between start and limit in
* this text with the given text. Attributes (out of band info)
* should be retained.
*
* @param rep A pointer to "this" UReplaceable object.
* @param start the starting index of the text to be replaced,
* inclusive.
* @param limit the ending index of the text to be replaced,
* exclusive.
* @param text the new text to replace the UChars from
* start..limit-1.
* @param textLength the number of UChars at text, or -1 if text
* is null-terminated.
* @stable ICU 2.0
*/
void (*replace)(UReplaceable* rep,
int32_t start,
int32_t limit,
const UChar* text,
int32_t textLength);
/**
* Function pointer that copies the characters in the range
* [<tt>start</tt>, <tt>limit</tt>) into the array <tt>dst</tt>.
*
* @param rep A pointer to "this" UReplaceable object.
* @param start offset of first character which will be copied
* into the array
* @param limit offset immediately following the last character to
* be copied
* @param dst array in which to copy characters. The length of
* <tt>dst</tt> must be at least <tt>(limit - start)</tt>.
* @stable ICU 2.1
*/
void (*extract)(UReplaceable* rep,
int32_t start,
int32_t limit,
UChar* dst);
/**
* Function pointer that copies text between start and limit in
* this text to another index in the text. Attributes (out of
* band info) should be retained. After this call, there will be
* (at least) two copies of the characters originally located at
* start..limit-1.
*
* @param rep A pointer to "this" UReplaceable object.
* @param start the starting index of the text to be copied,
* inclusive.
* @param limit the ending index of the text to be copied,
* exclusive.
* @param dest the index at which the copy of the UChars should be
* inserted.
* @stable ICU 2.0
*/
void (*copy)(UReplaceable* rep,
int32_t start,
int32_t limit,
int32_t dest);
} UReplaceableCallbacks;
U_CDECL_END
#endif
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