2 **********************************************************************
3 * Copyright (c) 2002, International Business Machines Corporation
4 * and others. All Rights Reserved.
5 **********************************************************************
6 * Date Name Description
7 * 01/14/2002 aliu Creation.
8 **********************************************************************
11 package com.ibm.icu.text;
14 * <code>UnicodeReplacer</code> defines a protocol for objects that
15 * replace a range of characters in a Replaceable string with output
16 * text. The replacement is done via the Replaceable API so as to
17 * preserve out-of-band data.
20 interface UnicodeReplacer {
23 * Replace characters in 'text' from 'start' to 'limit' with the
24 * output text of this object. Update the 'cursor' parameter to
25 * give the cursor position and return the length of the
28 * @param text the text to be matched
29 * @param start inclusive start index of text to be replaced
30 * @param limit exclusive end index of text to be replaced;
31 * must be greater than or equal to start
32 * @param cursor output parameter for the cursor position.
33 * Not all replacer objects will update this, but in a complete
34 * tree of replacer objects, representing the entire output side
35 * of a transliteration rule, at least one must update it.
36 * @return the number of 16-bit code units in the text replacing
37 * the characters at offsets start..(limit-1) in text
39 public abstract int replace(Replaceable text,
45 * Returns a string representation of this replacer. If the
46 * result of calling this function is passed to the appropriate
47 * parser, typically TransliteratorParser, it will produce another
48 * replacer that is equal to this one.
49 * @param escapeUnprintable if TRUE then convert unprintable
50 * character to their hex escape representations, \\uxxxx or
51 * \\Uxxxxxxxx. Unprintable characters are defined by
52 * Utility.isUnprintable().
54 public abstract String toReplacerPattern(boolean escapeUnprintable);
57 * Union the set of all characters that may output by this object
59 * @param toUnionTo the set into which to union the output characters
61 public abstract void addReplacementSetTo(UnicodeSet toUnionTo);