Check in the pristine copy of ICU 4.6...

icu46/source/i18n/esctrn.cpp

+/*
+**********************************************************************
+*   Copyright (c) 2001-2006, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+**********************************************************************
+*   Date        Name        Description
+*   11/19/2001  aliu        Creation.
+**********************************************************************
+*/
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_TRANSLITERATION
+
+#include "esctrn.h"
+#include "util.h"
+
+U_NAMESPACE_BEGIN
+
+static const UChar UNIPRE[] = {85,43,0}; // "U+"
+static const UChar BS_u[] = {92,117,0}; // "\\u"
+static const UChar BS_U[] = {92,85,0}; // "\\U"
+static const UChar XMLPRE[] = {38,35,120,0}; // "&#x"
+static const UChar XML10PRE[] = {38,35,0}; // "&#"
+static const UChar PERLPRE[] = {92,120,123,0}; // "\\x{"
+static const UChar SEMI[] = {59,0}; // ";"
+static const UChar RBRACE[] = {125,0}; // "}"
+static const UChar EMPTY[] = {0}; // ""
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(EscapeTransliterator)
+
+/**
+ * Factory methods
+ */
+static Transliterator* _createEscUnicode(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    // Unicode: "U+10FFFF" hex, min=4, max=6
+    return new EscapeTransliterator(ID, UNIPRE, EMPTY, 16, 4, TRUE, NULL);
+}
+static Transliterator* _createEscJava(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    // Java: "\\uFFFF" hex, min=4, max=4
+    return new EscapeTransliterator(ID, BS_u, EMPTY, 16, 4, FALSE, NULL);
+}
+static Transliterator* _createEscC(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    // C: "\\uFFFF" hex, min=4, max=4; \\U0010FFFF hex, min=8, max=8
+    return new EscapeTransliterator(ID, BS_u, EMPTY, 16, 4, TRUE,
+             new EscapeTransliterator(EMPTY, BS_U, EMPTY, 16, 8, TRUE, NULL));
+}
+static Transliterator* _createEscXML(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    // XML: "" hex, min=1, max=6
+    return new EscapeTransliterator(ID, XMLPRE, SEMI, 16, 1, TRUE, NULL);
+}
+static Transliterator* _createEscXML10(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    // XML10: "&1114111;" dec, min=1, max=7 (not really "Any-Hex")
+    return new EscapeTransliterator(ID, XML10PRE, SEMI, 10, 1, TRUE, NULL);
+}
+static Transliterator* _createEscPerl(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    // Perl: "\\x{263A}" hex, min=1, max=6
+    return new EscapeTransliterator(ID, PERLPRE, RBRACE, 16, 1, TRUE, NULL);
+}
+
+/**
+ * Registers standard variants with the system.  Called by
+ * Transliterator during initialization.
+ */
+void EscapeTransliterator::registerIDs() {
+    Token t = integerToken(0);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex/Unicode"), _createEscUnicode, t);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex/Java"), _createEscJava, t);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex/C"), _createEscC, t);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex/XML"), _createEscXML, t);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex/XML10"), _createEscXML10, t);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex/Perl"), _createEscPerl, t);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex"), _createEscJava, t);
+}
+
+/**
+ * Constructs an escape transliterator with the given ID and
+ * parameters.  See the class member documentation for details.
+ */
+EscapeTransliterator::EscapeTransliterator(const UnicodeString& newID,
+                         const UnicodeString& _prefix, const UnicodeString& _suffix,
+                         int32_t _radix, int32_t _minDigits,
+                         UBool _grokSupplementals,
+                         EscapeTransliterator* adoptedSupplementalHandler) :
+    Transliterator(newID, NULL)
+{
+    this->prefix = _prefix;
+    this->suffix = _suffix;
+    this->radix = _radix;
+    this->minDigits = _minDigits;
+    this->grokSupplementals = _grokSupplementals;
+    this->supplementalHandler = adoptedSupplementalHandler;
+}
+
+/**
+ * Copy constructor.
+ */
+EscapeTransliterator::EscapeTransliterator(const EscapeTransliterator& o) :
+    Transliterator(o),
+    prefix(o.prefix),
+    suffix(o.suffix),
+    radix(o.radix),
+    minDigits(o.minDigits),
+    grokSupplementals(o.grokSupplementals) {
+    supplementalHandler = (o.supplementalHandler != 0) ?
+        new EscapeTransliterator(*o.supplementalHandler) : NULL;
+}
+
+EscapeTransliterator::~EscapeTransliterator() {
+    delete supplementalHandler;
+}
+
+/**
+ * Transliterator API.
+ */
+Transliterator* EscapeTransliterator::clone() const {
+    return new EscapeTransliterator(*this);
+}
+
+/**
+ * Implements {@link Transliterator#handleTransliterate}.
+ */
+void EscapeTransliterator::handleTransliterate(Replaceable& text,
+                                               UTransPosition& pos,
+                                               UBool /*isIncremental*/) const
+{
+    /* TODO: Verify that isIncremental can be ignored */
+    int32_t start = pos.start;
+    int32_t limit = pos.limit;
+
+    UnicodeString buf(prefix);
+    int32_t prefixLen = prefix.length();
+    UBool redoPrefix = FALSE;
+
+    while (start < limit) {
+        int32_t c = grokSupplementals ? text.char32At(start) : text.charAt(start);
+        int32_t charLen = grokSupplementals ? UTF_CHAR_LENGTH(c) : 1;
+
+        if ((c & 0xFFFF0000) != 0 && supplementalHandler != NULL) {
+            buf.truncate(0);
+            buf.append(supplementalHandler->prefix);
+            ICU_Utility::appendNumber(buf, c, supplementalHandler->radix,
+                                  supplementalHandler->minDigits);
+            buf.append(supplementalHandler->suffix);
+            redoPrefix = TRUE;
+        } else {
+            if (redoPrefix) {
+                buf.truncate(0);
+                buf.append(prefix);
+                redoPrefix = FALSE;
+            } else {
+                buf.truncate(prefixLen);
+            }
+            ICU_Utility::appendNumber(buf, c, radix, minDigits);
+            buf.append(suffix);
+        }
+
+        text.handleReplaceBetween(start, start + charLen, buf);
+        start += buf.length();
+        limit += buf.length() - charLen;
+    }
+
+    pos.contextLimit += limit - pos.limit;
+    pos.limit = limit;
+    pos.start = start;
+}
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_TRANSLITERATION */
+
+//eof