icuSources/i18n/remtrans.cpp

   1 /*
   2 **********************************************************************
   3 *   Copyright (c) 2001-2011, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 **********************************************************************
   6 *   Date        Name        Description
   7 *   04/02/2001  aliu        Creation.
   8 **********************************************************************
   9 */
  10
  11 #include "unicode/utypes.h"
  12
  13 #if !UCONFIG_NO_TRANSLITERATION
  14
  15 #include "remtrans.h"
  16 #include "unicode/unifilt.h"
  17
  18 static const UChar CURR_ID[] = {65, 110, 121, 45, 0x52, 0x65, 0x6D, 0x6F, 0x76, 0x65, 0x00}; /* "Any-Remove" */
  19
  20 U_NAMESPACE_BEGIN
  21
  22 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(RemoveTransliterator)
  23
  24 /**
  25  * Factory method
  26  */
  27 static Transliterator* RemoveTransliterator_create(const UnicodeString& /*ID*/,
  28                                                    Transliterator::Token /*context*/) {
  29     /* We don't need the ID or context. We just remove data */
  30     return new RemoveTransliterator();
  31 }
  32
  33 /**
  34  * System registration hook.
  35  */
  36 void RemoveTransliterator::registerIDs() {
  37
  38     Transliterator::_registerFactory(UnicodeString(TRUE, ::CURR_ID, -1),
  39                                      RemoveTransliterator_create, integerToken(0));
  40
  41     Transliterator::_registerSpecialInverse(UNICODE_STRING_SIMPLE("Remove"),
  42                                             UNICODE_STRING_SIMPLE("Null"), FALSE);
  43 }
  44
  45 RemoveTransliterator::RemoveTransliterator() : Transliterator(UnicodeString(TRUE, ::CURR_ID, -1), 0) {}
  46
  47 RemoveTransliterator::~RemoveTransliterator() {}
  48
  49 Transliterator* RemoveTransliterator::clone(void) const {
  50     Transliterator* result = new RemoveTransliterator();
  51     if (result != NULL && getFilter() != 0) {
  52         result->adoptFilter((UnicodeFilter*)(getFilter()->clone()));
  53     }
  54     return result;
  55 }
  56
  57 void RemoveTransliterator::handleTransliterate(Replaceable& text, UTransPosition& index,
  58                                                UBool /*isIncremental*/) const {
  59     // Our caller (filteredTransliterate) has already narrowed us
  60     // to an unfiltered run.  Delete it.
  61     UnicodeString empty;
  62     text.handleReplaceBetween(index.start, index.limit, empty);
  63     int32_t len = index.limit - index.start;
  64     index.contextLimit -= len;
  65     index.limit -= len;
  66 }
  67 U_NAMESPACE_END
  68
  69 #endif /* #if !UCONFIG_NO_TRANSLITERATION */