source/i18n/remtrans.cpp

   1 // Copyright (C) 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 **********************************************************************
   5 *   Copyright (c) 2001-2011, International Business Machines
   6 *   Corporation and others.  All Rights Reserved.
   7 **********************************************************************
   8 *   Date        Name        Description
   9 *   04/02/2001  aliu        Creation.
  10 **********************************************************************
  11 */
  12
  13 #include "unicode/utypes.h"
  14
  15 #if !UCONFIG_NO_TRANSLITERATION
  16
  17 #include "remtrans.h"
  18 #include "unicode/unifilt.h"
  19
  20 static const UChar CURR_ID[] = {65, 110, 121, 45, 0x52, 0x65, 0x6D, 0x6F, 0x76, 0x65, 0x00}; /* "Any-Remove" */
  21
  22 U_NAMESPACE_BEGIN
  23
  24 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(RemoveTransliterator)
  25
  26 /**
  27  * Factory method
  28  */
  29 static Transliterator* RemoveTransliterator_create(const UnicodeString& /*ID*/,
  30                                                    Transliterator::Token /*context*/) {
  31     /* We don't need the ID or context. We just remove data */
  32     return new RemoveTransliterator();
  33 }
  34
  35 /**
  36  * System registration hook.
  37  */
  38 void RemoveTransliterator::registerIDs() {
  39
  40     Transliterator::_registerFactory(UnicodeString(TRUE, ::CURR_ID, -1),
  41                                      RemoveTransliterator_create, integerToken(0));
  42
  43     Transliterator::_registerSpecialInverse(UNICODE_STRING_SIMPLE("Remove"),
  44                                             UNICODE_STRING_SIMPLE("Null"), FALSE);
  45 }
  46
  47 RemoveTransliterator::RemoveTransliterator() : Transliterator(UnicodeString(TRUE, ::CURR_ID, -1), 0) {}
  48
  49 RemoveTransliterator::~RemoveTransliterator() {}
  50
  51 Transliterator* RemoveTransliterator::clone(void) const {
  52     Transliterator* result = new RemoveTransliterator();
  53     if (result != NULL && getFilter() != 0) {
  54         result->adoptFilter((UnicodeFilter*)(getFilter()->clone()));
  55     }
  56     return result;
  57 }
  58
  59 void RemoveTransliterator::handleTransliterate(Replaceable& text, UTransPosition& index,
  60                                                UBool /*isIncremental*/) const {
  61     // Our caller (filteredTransliterate) has already narrowed us
  62     // to an unfiltered run.  Delete it.
  63     UnicodeString empty;
  64     text.handleReplaceBetween(index.start, index.limit, empty);
  65     int32_t len = index.limit - index.start;
  66     index.contextLimit -= len;
  67     index.limit -= len;
  68 }
  69 U_NAMESPACE_END
  70
  71 #endif /* #if !UCONFIG_NO_TRANSLITERATION */