1 // Copyright (C) 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
4 **********************************************************************
5 * Copyright (c) 2002-2005, International Business Machines Corporation
6 * and others. All Rights Reserved.
7 **********************************************************************
8 * Date Name Description
9 * 01/14/2002 aliu Creation.
10 **********************************************************************
15 #include "unicode/utypes.h"
19 * \brief C++ API: UnicodeReplacer
29 * <code>UnicodeReplacer</code> defines a protocol for objects that
30 * replace a range of characters in a Replaceable string with output
31 * text. The replacement is done via the Replaceable API so as to
32 * preserve out-of-band data.
34 * <p>This is a mixin class.
38 class U_I18N_API UnicodeReplacer /* not : public UObject because this is an interface/mixin class */ {
46 virtual ~UnicodeReplacer();
49 * Replace characters in 'text' from 'start' to 'limit' with the
50 * output text of this object. Update the 'cursor' parameter to
51 * give the cursor position and return the length of the
54 * @param text the text to be matched
55 * @param start inclusive start index of text to be replaced
56 * @param limit exclusive end index of text to be replaced;
57 * must be greater than or equal to start
58 * @param cursor output parameter for the cursor position.
59 * Not all replacer objects will update this, but in a complete
60 * tree of replacer objects, representing the entire output side
61 * of a transliteration rule, at least one must update it.
62 * @return the number of 16-bit code units in the text replacing
63 * the characters at offsets start..(limit-1) in text
66 virtual int32_t replace(Replaceable& text,
72 * Returns a string representation of this replacer. If the
73 * result of calling this function is passed to the appropriate
74 * parser, typically TransliteratorParser, it will produce another
75 * replacer that is equal to this one.
76 * @param result the string to receive the pattern. Previous
77 * contents will be deleted.
78 * @param escapeUnprintable if TRUE then convert unprintable
79 * character to their hex escape representations, \\uxxxx or
80 * \\Uxxxxxxxx. Unprintable characters are defined by
81 * Utility.isUnprintable().
82 * @return a reference to 'result'.
85 virtual UnicodeString& toReplacerPattern(UnicodeString& result,
86 UBool escapeUnprintable) const = 0;
89 * Union the set of all characters that may output by this object
91 * @param toUnionTo the set into which to union the output characters
94 virtual void addReplacementSetTo(UnicodeSet& toUnionTo) const = 0;