icuSources/i18n/funcrepl.cpp

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 **********************************************************************
   5 *   Copyright (c) 2002-2012, International Business Machines Corporation
   6 *   and others.  All Rights Reserved.
   7 **********************************************************************
   8 *   Date        Name        Description
   9 *   02/04/2002  aliu        Creation.
  10 **********************************************************************
  11 */
  12
  13 #include "unicode/utypes.h"
  14
  15 #if !UCONFIG_NO_TRANSLITERATION
  16
  17 #include "unicode/translit.h"
  18 #include "unicode/uniset.h"
  19 #include "funcrepl.h"
  20
  21 static const UChar AMPERSAND = 38; // '&'
  22 static const UChar OPEN[]    = {40,32,0}; // "( "
  23 static const UChar CLOSE[]   = {32,41,0}; // " )"
  24
  25 U_NAMESPACE_BEGIN
  26
  27 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(FunctionReplacer)
  28
  29 /**
  30  * Construct a replacer that takes the output of the given
  31  * replacer, passes it through the given transliterator, and emits
  32  * the result as output.
  33  */
  34 FunctionReplacer::FunctionReplacer(Transliterator* adoptedTranslit,
  35                                    UnicodeFunctor* adoptedReplacer) {
  36     translit = adoptedTranslit;
  37     replacer = adoptedReplacer;
  38 }
  39
  40 /**
  41  * Copy constructor.
  42  */
  43 FunctionReplacer::FunctionReplacer(const FunctionReplacer& other) :
  44     UnicodeFunctor(other),
  45     UnicodeReplacer(other)
  46 {
  47     translit = other.translit->clone();
  48     replacer = other.replacer->clone();
  49 }
  50
  51 /**
  52  * Destructor
  53  */
  54 FunctionReplacer::~FunctionReplacer() {
  55     delete translit;
  56     delete replacer;
  57 }
  58
  59 /**
  60  * Implement UnicodeFunctor
  61  */
  62 UnicodeFunctor* FunctionReplacer::clone() const {
  63     return new FunctionReplacer(*this);
  64 }
  65
  66 /**
  67  * UnicodeFunctor API.  Cast 'this' to a UnicodeReplacer* pointer
  68  * and return the pointer.
  69  */
  70 UnicodeReplacer* FunctionReplacer::toReplacer() const {
  71   FunctionReplacer  *nonconst_this = const_cast<FunctionReplacer *>(this);
  72   UnicodeReplacer *nonconst_base = static_cast<UnicodeReplacer *>(nonconst_this);
  73
  74   return nonconst_base;
  75 }
  76
  77 /**
  78  * UnicodeReplacer API
  79  */
  80 int32_t FunctionReplacer::replace(Replaceable& text,
  81                                   int32_t start,
  82                                   int32_t limit,
  83                                   int32_t& cursor)
  84 {
  85
  86     // First delegate to subordinate replacer
  87     int32_t len = replacer->toReplacer()->replace(text, start, limit, cursor);
  88     limit = start + len;
  89
  90     // Now transliterate
  91     limit = translit->transliterate(text, start, limit);
  92
  93     return limit - start;
  94 }
  95
  96 /**
  97  * UnicodeReplacer API
  98  */
  99 UnicodeString& FunctionReplacer::toReplacerPattern(UnicodeString& rule,
 100                                                    UBool escapeUnprintable) const {
 101     UnicodeString str;
 102     rule.truncate(0);
 103     rule.append(AMPERSAND);
 104     rule.append(translit->getID());
 105     rule.append(OPEN, 2);
 106     rule.append(replacer->toReplacer()->toReplacerPattern(str, escapeUnprintable));
 107     rule.append(CLOSE, 2);
 108     return rule;
 109 }
 110
 111 /**
 112  * Implement UnicodeReplacer
 113  */
 114 void FunctionReplacer::addReplacementSetTo(UnicodeSet& toUnionTo) const {
 115     UnicodeSet set;
 116     toUnionTo.addAll(translit->getTargetSet(set));
 117 }
 118
 119 /**
 120  * UnicodeFunctor API
 121  */
 122 void FunctionReplacer::setData(const TransliterationRuleData* d) {
 123     replacer->setData(d);
 124 }
 125
 126 U_NAMESPACE_END
 127
 128 #endif /* #if !UCONFIG_NO_TRANSLITERATION */
 129
 130 //eof