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      1 //  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 */
     72