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unirepl.h
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// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ********************************************************************** * Copyright (c) 2002-2005, International Business Machines Corporation * and others. All Rights Reserved. ********************************************************************** * Date Name Description * 01/14/2002 aliu Creation. ********************************************************************** */ #ifndef UNIREPL_H #define UNIREPL_H #include "unicode/utypes.h" #if U_SHOW_CPLUSPLUS_API /** * \file * \brief C++ API: UnicodeReplacer */ U_NAMESPACE_BEGIN class Replaceable; class UnicodeString; class UnicodeSet; /** * <code>UnicodeReplacer</code> defines a protocol for objects that * replace a range of characters in a Replaceable string with output * text. The replacement is done via the Replaceable API so as to * preserve out-of-band data. * * <p>This is a mixin class. * @author Alan Liu * @stable ICU 2.4 */ class U_I18N_API UnicodeReplacer /* not : public UObject because this is an interface/mixin class */ { public: /** * Destructor. * @stable ICU 2.4 */ virtual ~UnicodeReplacer(); /** * Replace characters in 'text' from 'start' to 'limit' with the * output text of this object. Update the 'cursor' parameter to * give the cursor position and return the length of the * replacement text. * * @param text the text to be matched * @param start inclusive start index of text to be replaced * @param limit exclusive end index of text to be replaced; * must be greater than or equal to start * @param cursor output parameter for the cursor position. * Not all replacer objects will update this, but in a complete * tree of replacer objects, representing the entire output side * of a transliteration rule, at least one must update it. * @return the number of 16-bit code units in the text replacing * the characters at offsets start..(limit-1) in text * @stable ICU 2.4 */ virtual int32_t replace(Replaceable& text, int32_t start, int32_t limit, int32_t& cursor) = 0; /** * Returns a string representation of this replacer. If the * result of calling this function is passed to the appropriate * parser, typically TransliteratorParser, it will produce another * replacer that is equal to this one. * @param result the string to receive the pattern. Previous * contents will be deleted. * @param escapeUnprintable if true then convert unprintable * character to their hex escape representations, \\uxxxx or * \\Uxxxxxxxx. Unprintable characters are defined by * Utility.isUnprintable(). * @return a reference to 'result'. * @stable ICU 2.4 */ virtual UnicodeString& toReplacerPattern(UnicodeString& result, UBool escapeUnprintable) const = 0; /** * Union the set of all characters that may output by this object * into the given set. * @param toUnionTo the set into which to union the output characters * @stable ICU 2.4 */ virtual void addReplacementSetTo(UnicodeSet& toUnionTo) const = 0; }; U_NAMESPACE_END #endif /* U_SHOW_CPLUSPLUS_API */ #endif