| | 1 | /* |
| | 2 | ********************************************************************** |
| | 3 | * Copyright (c) 2002-2005, International Business Machines Corporation |
| | 4 | * and others. All Rights Reserved. |
| | 5 | ********************************************************************** |
| | 6 | * Date Name Description |
| | 7 | * 01/14/2002 aliu Creation. |
| | 8 | ********************************************************************** |
| | 9 | */ |
| | 10 | #ifndef UNIREPL_H |
| | 11 | #define UNIREPL_H |
| | 12 | |
| | 13 | #include "unicode/utypes.h" |
| | 14 | |
| | 15 | /** |
| | 16 | * \file |
| | 17 | * \brief C++ API: UnicodeReplacer |
| | 18 | */ |
| | 19 | |
| | 20 | U_NAMESPACE_BEGIN |
| | 21 | |
| | 22 | class Replaceable; |
| | 23 | class UnicodeString; |
| | 24 | class UnicodeSet; |
| | 25 | |
| | 26 | /** |
| | 27 | * <code>UnicodeReplacer</code> defines a protocol for objects that |
| | 28 | * replace a range of characters in a Replaceable string with output |
| | 29 | * text. The replacement is done via the Replaceable API so as to |
| | 30 | * preserve out-of-band data. |
| | 31 | * |
| | 32 | * <p>This is a mixin class. |
| | 33 | * @author Alan Liu |
| | 34 | * @stable ICU 2.4 |
| | 35 | */ |
| | 36 | class U_I18N_API UnicodeReplacer /* not : public UObject because this is an interface/mixin class */ { |
| | 37 | |
| | 38 | public: |
| | 39 | |
| | 40 | /** |
| | 41 | * Destructor. |
| | 42 | * @stable ICU 2.4 |
| | 43 | */ |
| | 44 | virtual ~UnicodeReplacer(); |
| | 45 | |
| | 46 | /** |
| | 47 | * Replace characters in 'text' from 'start' to 'limit' with the |
| | 48 | * output text of this object. Update the 'cursor' parameter to |
| | 49 | * give the cursor position and return the length of the |
| | 50 | * replacement text. |
| | 51 | * |
| | 52 | * @param text the text to be matched |
| | 53 | * @param start inclusive start index of text to be replaced |
| | 54 | * @param limit exclusive end index of text to be replaced; |
| | 55 | * must be greater than or equal to start |
| | 56 | * @param cursor output parameter for the cursor position. |
| | 57 | * Not all replacer objects will update this, but in a complete |
| | 58 | * tree of replacer objects, representing the entire output side |
| | 59 | * of a transliteration rule, at least one must update it. |
| | 60 | * @return the number of 16-bit code units in the text replacing |
| | 61 | * the characters at offsets start..(limit-1) in text |
| | 62 | * @stable ICU 2.4 |
| | 63 | */ |
| | 64 | virtual int32_t replace(Replaceable& text, |
| | 65 | int32_t start, |
| | 66 | int32_t limit, |
| | 67 | int32_t& cursor) = 0; |
| | 68 | |
| | 69 | /** |
| | 70 | * Returns a string representation of this replacer. If the |
| | 71 | * result of calling this function is passed to the appropriate |
| | 72 | * parser, typically TransliteratorParser, it will produce another |
| | 73 | * replacer that is equal to this one. |
| | 74 | * @param result the string to receive the pattern. Previous |
| | 75 | * contents will be deleted. |
| | 76 | * @param escapeUnprintable if TRUE then convert unprintable |
| | 77 | * character to their hex escape representations, \\uxxxx or |
| | 78 | * \\Uxxxxxxxx. Unprintable characters are defined by |
| | 79 | * Utility.isUnprintable(). |
| | 80 | * @return a reference to 'result'. |
| | 81 | * @stable ICU 2.4 |
| | 82 | */ |
| | 83 | virtual UnicodeString& toReplacerPattern(UnicodeString& result, |
| | 84 | UBool escapeUnprintable) const = 0; |
| | 85 | |
| | 86 | /** |
| | 87 | * Union the set of all characters that may output by this object |
| | 88 | * into the given set. |
| | 89 | * @param toUnionTo the set into which to union the output characters |
| | 90 | * @stable ICU 2.4 |
| | 91 | */ |
| | 92 | virtual void addReplacementSetTo(UnicodeSet& toUnionTo) const = 0; |
| | 93 | }; |
| | 94 | |
| | 95 | U_NAMESPACE_END |
| | 96 | |
| | 97 | #endif |
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