Check in the pristine copy of ICU 4.6...

icu46/source/i18n/unesctrn.cpp

+/*
+ **********************************************************************
+ *   Copyright (c) 2001-2008, 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 "unicode/uchar.h"
+#include "unesctrn.h"
+#include "util.h"
+
+#include "cmemory.h"
+
+U_NAMESPACE_BEGIN
+
+/**
+ * Special character marking the end of the spec[] array.
+ */
+static const UChar END = 0xFFFF;
+
+// Unicode: "U+10FFFF" hex, min=4, max=6
+static const UChar SPEC_Unicode[] = {
+    2, 0, 16, 4, 6, 85/*U*/, 43/*+*/,
+    END
+};
+
+// Java: "\\uFFFF" hex, min=4, max=4
+static const UChar SPEC_Java[] = {
+    2, 0, 16, 4, 4, 92/*\*/, 117/*u*/,
+    END
+};
+
+// C: "\\uFFFF" hex, min=4, max=4; \\U0010FFFF hex, min=8, max=8
+static const UChar SPEC_C[] = {
+    2, 0, 16, 4, 4, 92/*\*/, 117/*u*/,
+    2, 0, 16, 8, 8, 92/*\*/, 85/*U*/,
+    END
+};
+
+// XML: "" hex, min=1, max=6
+static const UChar SPEC_XML[] = {
+    3, 1, 16, 1, 6, 38/*&*/, 35/*#*/, 120/*x*/, 59/*;*/,
+    END
+};
+
+// XML10: "" dec, min=1, max=7 (not really "Hex-Any")
+static const UChar SPEC_XML10[] = {
+    2, 1, 10, 1, 7, 38/*&*/, 35/*#*/, 59/*;*/,
+    END
+};
+
+// Perl: "\\x{263A}" hex, min=1, max=6
+static const UChar SPEC_Perl[] = {
+    3, 1, 16, 1, 6, 92/*\*/, 120/*x*/, 123/*{*/, 125/*}*/,
+    END
+};
+
+// All: Java, C, Perl, XML, XML10, Unicode
+static const UChar SPEC_Any[] = {
+    2, 0, 16, 4, 6, 85/*U*/, 43/*+*/,                      // Unicode
+    2, 0, 16, 4, 4, 92/*\*/, 117/*u*/,                     // Java
+    2, 0, 16, 8, 8, 92/*\*/, 85/*U*/,                      // C (surrogates)
+    3, 1, 16, 1, 6, 38/*&*/, 35/*#*/, 120/*x*/, 59/*;*/,   // XML
+    2, 1, 10, 1, 7, 38/*&*/, 35/*#*/, 59/*;*/,             // XML10
+    3, 1, 16, 1, 6, 92/*\*/, 120/*x*/, 123/*{*/, 125/*}*/, // Perl
+    END
+};
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnescapeTransliterator)
+
+static UChar* copySpec(const UChar* spec) {
+    int32_t len = 0;
+    while (spec[len] != END) {
+        ++len;
+    }
+    ++len;
+    UChar *result = (UChar *)uprv_malloc(len*sizeof(UChar));
+    // Check for memory allocation error. 
+    if (result != NULL) {
+        uprv_memcpy(result, spec, len*sizeof(result[0]));
+    }
+    return result;
+}
+
+/**
+ * Factory methods.  Ignore the context.
+ */
+static Transliterator* _createUnicode(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    return new UnescapeTransliterator(ID, SPEC_Unicode);
+}
+static Transliterator* _createJava(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    return new UnescapeTransliterator(ID, SPEC_Java);
+}
+static Transliterator* _createC(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    return new UnescapeTransliterator(ID, SPEC_C);
+}
+static Transliterator* _createXML(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    return new UnescapeTransliterator(ID, SPEC_XML);
+}
+static Transliterator* _createXML10(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    return new UnescapeTransliterator(ID, SPEC_XML10);
+}
+static Transliterator* _createPerl(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    return new UnescapeTransliterator(ID, SPEC_Perl);
+}
+static Transliterator* _createAny(const UnicodeString& ID, Transliterator::Token /*context*/) {
+    return new UnescapeTransliterator(ID, SPEC_Any);
+}
+
+/**
+ * Registers standard variants with the system.  Called by
+ * Transliterator during initialization.
+ */
+void UnescapeTransliterator::registerIDs() {
+    Token t = integerToken(0);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any/Unicode"), _createUnicode, t);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any/Java"), _createJava, t);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any/C"), _createC, t);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any/XML"), _createXML, t);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any/XML10"), _createXML10, t);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any/Perl"), _createPerl, t);
+
+    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any"), _createAny, t);
+}
+
+/**
+ * Constructor.  Takes the encoded spec array.
+ */
+UnescapeTransliterator::UnescapeTransliterator(const UnicodeString& newID,
+                                               const UChar *newSpec) :
+    Transliterator(newID, NULL)
+{
+    this->spec = copySpec(newSpec);
+}
+
+/**
+ * Copy constructor.
+ */
+UnescapeTransliterator::UnescapeTransliterator(const UnescapeTransliterator& o) :
+    Transliterator(o) {
+    this->spec = copySpec(o.spec);
+}
+
+UnescapeTransliterator::~UnescapeTransliterator() {
+    uprv_free(spec);
+}
+
+/**
+ * Transliterator API.
+ */
+Transliterator* UnescapeTransliterator::clone() const {
+    return new UnescapeTransliterator(*this);
+}
+
+/**
+ * Implements {@link Transliterator#handleTransliterate}.
+ */
+void UnescapeTransliterator::handleTransliterate(Replaceable& text, UTransPosition& pos,
+                                                 UBool isIncremental) const {
+    int32_t start = pos.start;
+    int32_t limit = pos.limit;
+    int32_t i, j, ipat;
+
+    while (start < limit) {
+        // Loop over the forms in spec[].  Exit this loop when we
+        // match one of the specs.  Exit the outer loop if a
+        // partial match is detected and isIncremental is true.
+        for (j=0, ipat=0; spec[ipat] != END; ++j) {
+
+            // Read the header
+            int32_t prefixLen = spec[ipat++];
+            int32_t suffixLen = spec[ipat++];
+            int8_t  radix     = (int8_t) spec[ipat++];
+            int32_t minDigits = spec[ipat++];
+            int32_t maxDigits = spec[ipat++];
+
+            // s is a copy of start that is advanced over the
+            // characters as we parse them.
+            int32_t s = start;
+            UBool match = TRUE;
+
+            for (i=0; i<prefixLen; ++i) {
+                if (s >= limit) {
+                    if (i > 0) {
+                        // We've already matched a character.  This is
+                        // a partial match, so we return if in
+                        // incremental mode.  In non-incremental mode,
+                        // go to the next spec.
+                        if (isIncremental) {
+                            goto exit;
+                        }
+                        match = FALSE;
+                        break;
+                    }
+                }
+                UChar c = text.charAt(s++);
+                if (c != spec[ipat + i]) {
+                    match = FALSE;
+                    break;
+                }
+            }
+
+            if (match) {
+                UChar32 u = 0;
+                int32_t digitCount = 0;
+                for (;;) {
+                    if (s >= limit) {
+                        // Check for partial match in incremental mode.
+                        if (s > start && isIncremental) {
+                            goto exit;
+                        }
+                        break;
+                    }
+                    UChar32 ch = text.char32At(s);
+                    int32_t digit = u_digit(ch, radix);
+                    if (digit < 0) {
+                        break;
+                    }
+                    s += UTF_CHAR_LENGTH(ch);
+                    u = (u * radix) + digit;
+                    if (++digitCount == maxDigits) {
+                        break;
+                    }
+                }
+
+                match = (digitCount >= minDigits);
+
+                if (match) {
+                    for (i=0; i<suffixLen; ++i) {
+                        if (s >= limit) {
+                            // Check for partial match in incremental mode.
+                            if (s > start && isIncremental) {
+                                goto exit;
+                            }
+                            match = FALSE;
+                            break;
+                        }
+                        UChar c = text.charAt(s++);
+                        if (c != spec[ipat + prefixLen + i]) {
+                            match = FALSE;
+                            break;
+                        }
+                    }
+
+                    if (match) {
+                        // At this point, we have a match
+                        UnicodeString str(u);
+                        text.handleReplaceBetween(start, s, str);
+                        limit -= s - start - str.length();
+                        // The following break statement leaves the
+                        // loop that is traversing the forms in
+                        // spec[].  We then parse the next input
+                        // character.
+                        break;
+                    }
+                }
+            }
+
+            ipat += prefixLen + suffixLen;
+        }
+
+        if (start < limit) {
+            start += UTF_CHAR_LENGTH(text.char32At(start));
+        }
+    }
+
+  exit:
+    pos.contextLimit += limit - pos.limit;
+    pos.limit = limit;
+    pos.start = start;
+}
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_TRANSLITERATION */
+
+//eof