icuSources/i18n/unicode/unirepl.h

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   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 **********************************************************************
  11 */
  12 #ifndef UNIREPL_H
  13 #define UNIREPL_H
  14
  15 #include "unicode/utypes.h"
  16
  17 #if U_SHOW_CPLUSPLUS_API
  18
  19 /**
  20  * \file
  21  * \brief C++ API: UnicodeReplacer
  22  */
  23
  24 U_NAMESPACE_BEGIN
  25
  26 class Replaceable;
  27 class UnicodeString;
  28 class UnicodeSet;
  29
  30 /**
  31  * <code>UnicodeReplacer</code> defines a protocol for objects that
  32  * replace a range of characters in a Replaceable string with output
  33  * text.  The replacement is done via the Replaceable API so as to
  34  * preserve out-of-band data.
  35  *
  36  * <p>This is a mixin class.
  37  * @author Alan Liu
  38  * @stable ICU 2.4
  39  */
  40 class U_I18N_API UnicodeReplacer /* not : public UObject because this is an interface/mixin class */ {
  41
  42  public:
  43
  44     /**
  45      * Destructor.
  46      * @stable ICU 2.4
  47      */
  48     virtual ~UnicodeReplacer();
  49
  50     /**
  51      * Replace characters in 'text' from 'start' to 'limit' with the
  52      * output text of this object.  Update the 'cursor' parameter to
  53      * give the cursor position and return the length of the
  54      * replacement text.
  55      *
  56      * @param text the text to be matched
  57      * @param start inclusive start index of text to be replaced
  58      * @param limit exclusive end index of text to be replaced;
  59      * must be greater than or equal to start
  60      * @param cursor output parameter for the cursor position.
  61      * Not all replacer objects will update this, but in a complete
  62      * tree of replacer objects, representing the entire output side
  63      * of a transliteration rule, at least one must update it.
  64      * @return the number of 16-bit code units in the text replacing
  65      * the characters at offsets start..(limit-1) in text
  66      * @stable ICU 2.4
  67      */
  68     virtual int32_t replace(Replaceable& text,
  69                             int32_t start,
  70                             int32_t limit,
  71                             int32_t& cursor) = 0;
  72
  73     /**
  74      * Returns a string representation of this replacer.  If the
  75      * result of calling this function is passed to the appropriate
  76      * parser, typically TransliteratorParser, it will produce another
  77      * replacer that is equal to this one.
  78      * @param result the string to receive the pattern.  Previous
  79      * contents will be deleted.
  80      * @param escapeUnprintable if TRUE then convert unprintable
  81      * character to their hex escape representations, \\uxxxx or
  82      * \\Uxxxxxxxx.  Unprintable characters are defined by
  83      * Utility.isUnprintable().
  84      * @return a reference to 'result'.
  85      * @stable ICU 2.4
  86      */
  87     virtual UnicodeString& toReplacerPattern(UnicodeString& result,
  88                                              UBool escapeUnprintable) const = 0;
  89
  90     /**
  91      * Union the set of all characters that may output by this object
  92      * into the given set.
  93      * @param toUnionTo the set into which to union the output characters
  94      * @stable ICU 2.4
  95      */
  96     virtual void addReplacementSetTo(UnicodeSet& toUnionTo) const = 0;
  97 };
  98
  99 U_NAMESPACE_END
 100
 101 #endif /* U_SHOW_CPLUSPLUS_API */
 102
 103 #endif