Merge WebKit at r66666 : Initial merge by git.

Change-Id: I57dedeb49859adc9c539e760f0e749768c66626f

1 files changed, 272 insertions, 0 deletions

diff --git a/WebCore/html/parser/HTMLEntityParser.cpp b/WebCore/html/parser/HTMLEntityParser.cpp
new file mode 100644
index 0000000..6a422b8
--- /dev/null
+++ b/WebCore/html/parser/HTMLEntityParser.cpp
@@ -0,0 +1,272 @@
+/*
+ * Copyright (C) 2008 Apple Inc. All Rights Reserved.
+ * Copyright (C) 2009 Torch Mobile, Inc. http://www.torchmobile.com/
+ * Copyright (C) 2010 Google, Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "HTMLEntityParser.h"
+
+#include "HTMLEntitySearch.h"
+#include "HTMLEntityTable.h"
+#include <wtf/Vector.h>
+
+using namespace WTF;
+
+namespace WebCore {
+
+namespace {
+
+static const UChar windowsLatin1ExtensionArray[32] = {
+    0x20AC, 0x0081, 0x201A, 0x0192, 0x201E, 0x2026, 0x2020, 0x2021, // 80-87
+    0x02C6, 0x2030, 0x0160, 0x2039, 0x0152, 0x008D, 0x017D, 0x008F, // 88-8F
+    0x0090, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014, // 90-97
+    0x02DC, 0x2122, 0x0161, 0x203A, 0x0153, 0x009D, 0x017E, 0x0178, // 98-9F
+};
+
+inline UChar adjustEntity(UChar32 value)
+{
+    if ((value & ~0x1F) != 0x0080)
+        return value;
+    return windowsLatin1ExtensionArray[value - 0x80];
+}
+
+inline UChar32 legalEntityFor(UChar32 value)
+{
+    // FIXME: A number of specific entity values generate parse errors.
+    if (value == 0 || value > 0x10FFFF || (value >= 0xD800 && value <= 0xDFFF))
+        return 0xFFFD;
+    if (U_IS_BMP(value))
+        return adjustEntity(value);
+    return value;
+}
+
+inline bool convertToUTF16(UChar32 value, Vector<UChar, 16>& decodedEntity)
+{
+    if (U_IS_BMP(value)) {
+        UChar character = static_cast<UChar>(value);
+        ASSERT(character == value);
+        decodedEntity.append(character);
+        return true;
+    }
+    decodedEntity.append(U16_LEAD(value));
+    decodedEntity.append(U16_TRAIL(value));
+    return true;
+}
+
+inline bool isHexDigit(UChar cc)
+{
+    return (cc >= '0' && cc <= '9') || (cc >= 'a' && cc <= 'f') || (cc >= 'A' && cc <= 'F');
+}
+
+inline bool isAlphaNumeric(UChar cc)
+{
+    return (cc >= '0' && cc <= '9') || (cc >= 'a' && cc <= 'z') || (cc >= 'A' && cc <= 'Z');
+}
+
+void unconsumeCharacters(SegmentedString& source, const Vector<UChar, 10>& consumedCharacters)
+{
+    if (consumedCharacters.size() == 1)
+        source.push(consumedCharacters[0]);
+    else if (consumedCharacters.size() == 2) {
+        source.push(consumedCharacters[0]);
+        source.push(consumedCharacters[1]);
+    } else
+        source.prepend(SegmentedString(String(consumedCharacters.data(), consumedCharacters.size())));
+}
+
+}
+
+bool consumeHTMLEntity(SegmentedString& source, Vector<UChar, 16>& decodedEntity, bool& notEnoughCharacters, UChar additionalAllowedCharacter)
+{
+    ASSERT(!additionalAllowedCharacter || additionalAllowedCharacter == '"' || additionalAllowedCharacter == '\'' || additionalAllowedCharacter == '>');
+    ASSERT(!notEnoughCharacters);
+    ASSERT(decodedEntity.isEmpty());
+
+    enum EntityState {
+        Initial,
+        Number,
+        MaybeHexLowerCaseX,
+        MaybeHexUpperCaseX,
+        Hex,
+        Decimal,
+        Named
+    };
+    EntityState entityState = Initial;
+    UChar32 result = 0;
+    Vector<UChar, 10> consumedCharacters;
+
+    while (!source.isEmpty()) {
+        UChar cc = *source;
+        switch (entityState) {
+        case Initial: {
+            if (cc == '\x09' || cc == '\x0A' || cc == '\x0C' || cc == ' ' || cc == '<' || cc == '&')
+                return false;
+            if (additionalAllowedCharacter && cc == additionalAllowedCharacter)
+                return false;
+            if (cc == '#') {
+                entityState = Number;
+                break;
+            }
+            if ((cc >= 'a' && cc <= 'z') || (cc >= 'A' && cc <= 'Z')) {
+                entityState = Named;
+                continue;
+            }
+            return false;
+        }
+        case Number: {
+            if (cc == 'x') {
+                entityState = MaybeHexLowerCaseX;
+                break;
+            }
+            if (cc == 'X') {
+                entityState = MaybeHexUpperCaseX;
+                break;
+            }
+            if (cc >= '0' && cc <= '9') {
+                entityState = Decimal;
+                continue;
+            }
+            source.push('#');
+            return false;
+        }
+        case MaybeHexLowerCaseX: {
+            if (isHexDigit(cc)) {
+                entityState = Hex;
+                continue;
+            }
+            source.push('#');
+            source.push('x');
+            return false;
+        }
+        case MaybeHexUpperCaseX: {
+            if (isHexDigit(cc)) {
+                entityState = Hex;
+                continue;
+            }
+            source.push('#');
+            source.push('X');
+            return false;
+        }
+        case Hex: {
+            if (cc >= '0' && cc <= '9')
+                result = result * 16 + cc - '0';
+            else if (cc >= 'a' && cc <= 'f')
+                result = result * 16 + 10 + cc - 'a';
+            else if (cc >= 'A' && cc <= 'F')
+                result = result * 16 + 10 + cc - 'A';
+            else {
+                if (cc == ';')
+                    source.advanceAndASSERT(cc);
+                return convertToUTF16(legalEntityFor(result), decodedEntity);
+            }
+            break;
+        }
+        case Decimal: {
+            if (cc >= '0' && cc <= '9')
+                result = result * 10 + cc - '0';
+            else {
+                if (cc == ';')
+                    source.advanceAndASSERT(cc);
+                return convertToUTF16(legalEntityFor(result), decodedEntity);
+            }
+            break;
+        }
+        case Named: {
+            HTMLEntitySearch entitySearch;
+            while (!source.isEmpty()) {
+                cc = *source;
+                entitySearch.advance(cc);
+                if (!entitySearch.isEntityPrefix())
+                    break;
+                consumedCharacters.append(cc);
+                source.advanceAndASSERT(cc);
+            }
+            notEnoughCharacters = source.isEmpty();
+            if (notEnoughCharacters) {
+                // We can't an entity because there might be a longer entity
+                // that we could match if we had more data.
+                unconsumeCharacters(source, consumedCharacters);
+                return false;
+            }
+            if (!entitySearch.mostRecentMatch()) {
+                ASSERT(!entitySearch.currentValue());
+                unconsumeCharacters(source, consumedCharacters);
+                return false;
+            }
+            if (entitySearch.mostRecentMatch()->length != entitySearch.currentLength()) {
+                // We've consumed too many characters.  We need to walk the
+                // source back to the point at which we had consumed an
+                // actual entity.
+                unconsumeCharacters(source, consumedCharacters);
+                consumedCharacters.clear();
+                const int length = entitySearch.mostRecentMatch()->length;
+                const UChar* reference = entitySearch.mostRecentMatch()->entity;
+                for (int i = 0; i < length; ++i) {
+                    cc = *source;
+                    ASSERT_UNUSED(reference, cc == *reference++);
+                    consumedCharacters.append(cc);
+                    source.advanceAndASSERT(cc);
+                    ASSERT(!source.isEmpty());
+                }
+                cc = *source;
+            }
+            if (entitySearch.mostRecentMatch()->lastCharacter() == ';'
+                || !additionalAllowedCharacter
+                || !(isAlphaNumeric(cc) || cc == '=')) {
+                return convertToUTF16(entitySearch.mostRecentMatch()->value, decodedEntity);
+            }
+            unconsumeCharacters(source, consumedCharacters);
+            return false;
+        }
+        }
+        consumedCharacters.append(cc);
+        source.advanceAndASSERT(cc);
+    }
+    ASSERT(source.isEmpty());
+    notEnoughCharacters = true;
+    unconsumeCharacters(source, consumedCharacters);
+    return false;
+}
+
+UChar decodeNamedEntity(const char* name)
+{
+    HTMLEntitySearch search;
+    while (*name) {
+        search.advance(*name++);
+        if (!search.isEntityPrefix())
+            return 0;
+    }
+    search.advance(';');
+    UChar32 entityValue = search.currentValue();
+    if (U16_LENGTH(entityValue) != 1) {
+        // Callers need to move off this API if the entity table has values
+        // which do no fit in a 16 bit UChar!
+        ASSERT_NOT_REACHED();
+        return 0;
+    }
+    return static_cast<UChar>(entityValue);
+}
+
+} // namespace WebCore