Check in the pristine copy of ICU 4.6...

icu46/source/i18n/uni2name.cpp

+/*
+**********************************************************************
+*   Copyright (C) 2001-2007, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+**********************************************************************
+*   Date        Name        Description
+*   06/06/01    aliu        Creation.
+**********************************************************************
+*/
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_TRANSLITERATION
+
+#include "unicode/unifilt.h"
+#include "unicode/uchar.h"
+#include "uni2name.h"
+#include "cstring.h"
+#include "cmemory.h"
+#include "uprops.h"
+
+U_NAMESPACE_BEGIN
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnicodeNameTransliterator)
+
+static const UChar OPEN_DELIM[] = {92,78,123,0}; // "\N{"
+static const UChar CLOSE_DELIM  = 125; // "}"
+#define OPEN_DELIM_LEN 3
+
+/**
+ * Constructs a transliterator.
+ */
+UnicodeNameTransliterator::UnicodeNameTransliterator(UnicodeFilter* adoptedFilter) :
+    Transliterator(UNICODE_STRING("Any-Name", 8), adoptedFilter) {
+}
+
+/**
+ * Destructor.
+ */
+UnicodeNameTransliterator::~UnicodeNameTransliterator() {}
+
+/**
+ * Copy constructor.
+ */
+UnicodeNameTransliterator::UnicodeNameTransliterator(const UnicodeNameTransliterator& o) :
+    Transliterator(o) {}
+
+/**
+ * Assignment operator.
+ */
+/*UnicodeNameTransliterator& UnicodeNameTransliterator::operator=(
+                             const UnicodeNameTransliterator& o) {
+    Transliterator::operator=(o);
+    return *this;
+}*/
+
+/**
+ * Transliterator API.
+ */
+Transliterator* UnicodeNameTransliterator::clone(void) const {
+    return new UnicodeNameTransliterator(*this);
+}
+
+/**
+ * Implements {@link Transliterator#handleTransliterate}.
+ * Ignore isIncremental since we don't need the context, and
+ * we work on codepoints.
+ */
+void UnicodeNameTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
+                                                    UBool /*isIncremental*/) const {
+    // The failure mode, here and below, is to behave like Any-Null,
+    // if either there is no name data (max len == 0) or there is no
+    // memory (malloc() => NULL).
+
+    int32_t maxLen = uprv_getMaxCharNameLength();
+    if (maxLen == 0) {
+        offsets.start = offsets.limit;
+        return;
+    }
+
+    // Accomodate the longest possible name plus padding
+    char* buf = (char*) uprv_malloc(maxLen);
+    if (buf == NULL) {
+        offsets.start = offsets.limit;
+        return;
+    }
+    
+    int32_t cursor = offsets.start;
+    int32_t limit = offsets.limit;
+
+    UnicodeString str(FALSE, OPEN_DELIM, OPEN_DELIM_LEN);
+    UErrorCode status;
+    int32_t len;
+
+    while (cursor < limit) {
+        UChar32 c = text.char32At(cursor);
+        int32_t clen = UTF_CHAR_LENGTH(c);
+        status = U_ZERO_ERROR;
+        if ((len = u_charName(c, U_EXTENDED_CHAR_NAME, buf, maxLen, &status)) >0 && !U_FAILURE(status)) {
+            str.truncate(OPEN_DELIM_LEN);
+            str.append(UnicodeString(buf, len, US_INV)).append(CLOSE_DELIM);
+            text.handleReplaceBetween(cursor, cursor+clen, str);
+            len += OPEN_DELIM_LEN + 1; // adjust for delimiters
+            cursor += len; // advance cursor and adjust for new text
+            limit += len-clen; // change in length
+        } else {
+            cursor += clen;
+        }
+    }
+
+    offsets.contextLimit += limit - offsets.limit;
+    offsets.limit = limit;
+    offsets.start = cursor;
+
+    uprv_free(buf);
+}
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_TRANSLITERATION */