icuSources/i18n/uni2name.cpp

   1 /*
   2 **********************************************************************
   3 *   Copyright (C) 2001-2004, 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 "uni2name.h"
  18 #include "cstring.h"
  19 #include "cmemory.h"
  20 #include "uprops.h"
  21
  22 U_NAMESPACE_BEGIN
  23
  24 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnicodeNameTransliterator)
  25
  26 static const UChar OPEN_DELIM[] = {92,78,123,0}; // "\N{"
  27 static const UChar CLOSE_DELIM  = 125; // "}"
  28 #define OPEN_DELIM_LEN 3
  29
  30 /**
  31  * Constructs a transliterator.
  32  */
  33 UnicodeNameTransliterator::UnicodeNameTransliterator(UnicodeFilter* adoptedFilter) :
  34     Transliterator(UNICODE_STRING("Any-Name", 8), adoptedFilter) {
  35 }
  36
  37 /**
  38  * Destructor.
  39  */
  40 UnicodeNameTransliterator::~UnicodeNameTransliterator() {}
  41
  42 /**
  43  * Copy constructor.
  44  */
  45 UnicodeNameTransliterator::UnicodeNameTransliterator(const UnicodeNameTransliterator& o) :
  46     Transliterator(o) {}
  47
  48 /**
  49  * Assignment operator.
  50  */
  51 UnicodeNameTransliterator& UnicodeNameTransliterator::operator=(
  52                              const UnicodeNameTransliterator& o) {
  53     Transliterator::operator=(o);
  54     return *this;
  55 }
  56
  57 /**
  58  * Transliterator API.
  59  */
  60 Transliterator* UnicodeNameTransliterator::clone(void) const {
  61     return new UnicodeNameTransliterator(*this);
  62 }
  63
  64 /**
  65  * Implements {@link Transliterator#handleTransliterate}.
  66  * Ignore isIncremental since we don't need the context, and
  67  * we work on codepoints.
  68  */
  69 void UnicodeNameTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
  70                                                     UBool /*isIncremental*/) const {
  71     // The failure mode, here and below, is to behave like Any-Null,
  72     // if either there is no name data (max len == 0) or there is no
  73     // memory (malloc() => NULL).
  74
  75     int32_t maxLen = uprv_getMaxCharNameLength();
  76     if (maxLen == 0) {
  77         offsets.start = offsets.limit;
  78         return;
  79     }
  80
  81     // Accomodate the longest possible name plus padding
  82     char* buf = (char*) uprv_malloc(maxLen);
  83     if (buf == NULL) {
  84         offsets.start = offsets.limit;
  85         return;
  86     }
  87
  88     int32_t cursor = offsets.start;
  89     int32_t limit = offsets.limit;
  90
  91     UnicodeString str(FALSE, OPEN_DELIM, OPEN_DELIM_LEN);
  92     UErrorCode status;
  93     int32_t len;
  94
  95     while (cursor < limit) {
  96         UChar32 c = text.char32At(cursor);
  97         int32_t clen = UTF_CHAR_LENGTH(c);
  98         status = U_ZERO_ERROR;
  99         if ((len = u_charName(c, U_EXTENDED_CHAR_NAME, buf, maxLen, &status)) >0 && !U_FAILURE(status)) {
 100             str.truncate(OPEN_DELIM_LEN);
 101             str.append(UnicodeString(buf, len, "")).append(CLOSE_DELIM);
 102             text.handleReplaceBetween(cursor, cursor+clen, str);
 103             len += OPEN_DELIM_LEN + 1; // adjust for delimiters
 104             cursor += len; // advance cursor and adjust for new text
 105             limit += len-clen; // change in length
 106         } else {
 107             cursor += clen;
 108         }
 109     }
 110
 111     offsets.contextLimit += limit - offsets.limit;
 112     offsets.limit = limit;
 113     offsets.start = cursor;
 114
 115     uprv_free(buf);
 116 }
 117
 118 U_NAMESPACE_END
 119
 120 #endif /* #if !UCONFIG_NO_TRANSLITERATION */