icuSources/i18n/uni2name.cpp

   1 /*
   2 **********************************************************************
   3 *   Copyright (C) 2001-2011, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 **********************************************************************
   6 *   Date        Name        Description
   7 *   06/06/01    aliu        Creation.
   8 **********************************************************************
   9 */
  10
  11 #include "unicode/utypes.h"
  12
  13 #if !UCONFIG_NO_TRANSLITERATION
  14
  15 #include "unicode/unifilt.h"
  16 #include "unicode/uchar.h"
  17 #include "unicode/utf16.h"
  18 #include "uni2name.h"
  19 #include "cstring.h"
  20 #include "cmemory.h"
  21 #include "uprops.h"
  22
  23 U_NAMESPACE_BEGIN
  24
  25 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnicodeNameTransliterator)
  26
  27 static const UChar OPEN_DELIM[] = {92,78,123,0}; // "\N{"
  28 static const UChar CLOSE_DELIM  = 125; // "}"
  29 #define OPEN_DELIM_LEN 3
  30
  31 /**
  32  * Constructs a transliterator.
  33  */
  34 UnicodeNameTransliterator::UnicodeNameTransliterator(UnicodeFilter* adoptedFilter) :
  35     Transliterator(UNICODE_STRING("Any-Name", 8), adoptedFilter) {
  36 }
  37
  38 /**
  39  * Destructor.
  40  */
  41 UnicodeNameTransliterator::~UnicodeNameTransliterator() {}
  42
  43 /**
  44  * Copy constructor.
  45  */
  46 UnicodeNameTransliterator::UnicodeNameTransliterator(const UnicodeNameTransliterator& o) :
  47     Transliterator(o) {}
  48
  49 /**
  50  * Assignment operator.
  51  */
  52 /*UnicodeNameTransliterator& UnicodeNameTransliterator::operator=(
  53                              const UnicodeNameTransliterator& o) {
  54     Transliterator::operator=(o);
  55     return *this;
  56 }*/
  57
  58 /**
  59  * Transliterator API.
  60  */
  61 Transliterator* UnicodeNameTransliterator::clone(void) const {
  62     return new UnicodeNameTransliterator(*this);
  63 }
  64
  65 /**
  66  * Implements {@link Transliterator#handleTransliterate}.
  67  * Ignore isIncremental since we don't need the context, and
  68  * we work on codepoints.
  69  */
  70 void UnicodeNameTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
  71                                                     UBool /*isIncremental*/) const {
  72     // The failure mode, here and below, is to behave like Any-Null,
  73     // if either there is no name data (max len == 0) or there is no
  74     // memory (malloc() => NULL).
  75
  76     int32_t maxLen = uprv_getMaxCharNameLength();
  77     if (maxLen == 0) {
  78         offsets.start = offsets.limit;
  79         return;
  80     }
  81
  82     // Accomodate the longest possible name plus padding
  83     char* buf = (char*) uprv_malloc(maxLen);
  84     if (buf == NULL) {
  85         offsets.start = offsets.limit;
  86         return;
  87     }
  88
  89     int32_t cursor = offsets.start;
  90     int32_t limit = offsets.limit;
  91
  92     UnicodeString str(FALSE, OPEN_DELIM, OPEN_DELIM_LEN);
  93     UErrorCode status;
  94     int32_t len;
  95
  96     while (cursor < limit) {
  97         UChar32 c = text.char32At(cursor);
  98         int32_t clen = U16_LENGTH(c);
  99         status = U_ZERO_ERROR;
 100         if ((len = u_charName(c, U_EXTENDED_CHAR_NAME, buf, maxLen, &status)) >0 && !U_FAILURE(status)) {
 101             str.truncate(OPEN_DELIM_LEN);
 102             str.append(UnicodeString(buf, len, US_INV)).append(CLOSE_DELIM);
 103             text.handleReplaceBetween(cursor, cursor+clen, str);
 104             len += OPEN_DELIM_LEN + 1; // adjust for delimiters
 105             cursor += len; // advance cursor and adjust for new text
 106             limit += len-clen; // change in length
 107         } else {
 108             cursor += clen;
 109         }
 110     }
 111
 112     offsets.contextLimit += limit - offsets.limit;
 113     offsets.limit = limit;
 114     offsets.start = cursor;
 115
 116     uprv_free(buf);
 117 }
 118
 119 U_NAMESPACE_END
 120
 121 #endif /* #if !UCONFIG_NO_TRANSLITERATION */