icuSources/i18n/uni2name.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) 2001-2011, International Business Machines
   6 *   Corporation and others.  All Rights Reserved.
   7 **********************************************************************
   8 *   Date        Name        Description
   9 *   06/06/01    aliu        Creation.
  10 **********************************************************************
  11 */
  12
  13 #include "unicode/utypes.h"
  14
  15 #if !UCONFIG_NO_TRANSLITERATION
  16
  17 #include "unicode/unifilt.h"
  18 #include "unicode/uchar.h"
  19 #include "unicode/utf16.h"
  20 #include "uni2name.h"
  21 #include "cstring.h"
  22 #include "cmemory.h"
  23 #include "uprops.h"
  24
  25 U_NAMESPACE_BEGIN
  26
  27 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnicodeNameTransliterator)
  28
  29 static const UChar OPEN_DELIM[] = {92,78,123,0}; // "\N{"
  30 static const UChar CLOSE_DELIM  = 125; // "}"
  31 #define OPEN_DELIM_LEN 3
  32
  33 /**
  34  * Constructs a transliterator.
  35  */
  36 UnicodeNameTransliterator::UnicodeNameTransliterator(UnicodeFilter* adoptedFilter) :
  37     Transliterator(UNICODE_STRING("Any-Name", 8), adoptedFilter) {
  38 }
  39
  40 /**
  41  * Destructor.
  42  */
  43 UnicodeNameTransliterator::~UnicodeNameTransliterator() {}
  44
  45 /**
  46  * Copy constructor.
  47  */
  48 UnicodeNameTransliterator::UnicodeNameTransliterator(const UnicodeNameTransliterator& o) :
  49     Transliterator(o) {}
  50
  51 /**
  52  * Assignment operator.
  53  */
  54 /*UnicodeNameTransliterator& UnicodeNameTransliterator::operator=(
  55                              const UnicodeNameTransliterator& o) {
  56     Transliterator::operator=(o);
  57     return *this;
  58 }*/
  59
  60 /**
  61  * Transliterator API.
  62  */
  63 Transliterator* UnicodeNameTransliterator::clone(void) const {
  64     return new UnicodeNameTransliterator(*this);
  65 }
  66
  67 /**
  68  * Implements {@link Transliterator#handleTransliterate}.
  69  * Ignore isIncremental since we don't need the context, and
  70  * we work on codepoints.
  71  */
  72 void UnicodeNameTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
  73                                                     UBool /*isIncremental*/) const {
  74     // The failure mode, here and below, is to behave like Any-Null,
  75     // if either there is no name data (max len == 0) or there is no
  76     // memory (malloc() => NULL).
  77
  78     int32_t maxLen = uprv_getMaxCharNameLength();
  79     if (maxLen == 0) {
  80         offsets.start = offsets.limit;
  81         return;
  82     }
  83
  84     // Accomodate the longest possible name plus padding
  85     char* buf = (char*) uprv_malloc(maxLen);
  86     if (buf == NULL) {
  87         offsets.start = offsets.limit;
  88         return;
  89     }
  90
  91     int32_t cursor = offsets.start;
  92     int32_t limit = offsets.limit;
  93
  94     UnicodeString str(FALSE, OPEN_DELIM, OPEN_DELIM_LEN);
  95     UErrorCode status;
  96     int32_t len;
  97
  98     while (cursor < limit) {
  99         UChar32 c = text.char32At(cursor);
 100         int32_t clen = U16_LENGTH(c);
 101         status = U_ZERO_ERROR;
 102         if ((len = u_charName(c, U_EXTENDED_CHAR_NAME, buf, maxLen, &status)) >0 && !U_FAILURE(status)) {
 103             str.truncate(OPEN_DELIM_LEN);
 104             str.append(UnicodeString(buf, len, US_INV)).append(CLOSE_DELIM);
 105             text.handleReplaceBetween(cursor, cursor+clen, str);
 106             len += OPEN_DELIM_LEN + 1; // adjust for delimiters
 107             cursor += len; // advance cursor and adjust for new text
 108             limit += len-clen; // change in length
 109         } else {
 110             cursor += clen;
 111         }
 112     }
 113
 114     offsets.contextLimit += limit - offsets.limit;
 115     offsets.limit = limit;
 116     offsets.start = cursor;
 117
 118     uprv_free(buf);
 119 }
 120
 121 U_NAMESPACE_END
 122
 123 #endif /* #if !UCONFIG_NO_TRANSLITERATION */