1 files changed, 217 insertions, 0 deletions
diff --git a/Source/WebCore/css/CSSMarkup.cpp b/Source/WebCore/css/CSSMarkup.cpp
new file mode 100644
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+++ b/Source/WebCore/css/CSSMarkup.cpp
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+/*
+ * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
+ * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
+ * Copyright (C) 2004-2012, 2016 Apple Inc. All rights reserved.
+ * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
+ * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
+ * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
+ * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
+ * Copyright (C) 2012 Intel Corporation. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "config.h"
+#include "CSSMarkup.h"
+
+#include "CSSParserIdioms.h"
+#include <wtf/HexNumber.h>
+#include <wtf/text/StringBuffer.h>
+#include <wtf/text/StringBuilder.h>
+
+namespace WebCore {
+
+template <typename CharacterType>
+static inline bool isCSSTokenizerIdentifier(const CharacterType* characters, unsigned length)
+{
+    const CharacterType* end = characters + length;
+
+    // -?
+    if (characters != end && characters[0] == '-')
+        ++characters;
+
+    // {nmstart}
+    if (characters == end || !isNameStartCodePoint(characters[0]))
+        return false;
+    ++characters;
+
+    // {nmchar}*
+    for (; characters != end; ++characters) {
+        if (!isNameCodePoint(characters[0]))
+            return false;
+    }
+
+    return true;
+}
+
+// "ident" from the CSS tokenizer, minus backslash-escape sequences
+static bool isCSSTokenizerIdentifier(const String& string)
+{
+    unsigned length = string.length();
+
+    if (!length)
+        return false;
+
+    if (string.is8Bit())
+        return isCSSTokenizerIdentifier(string.characters8(), length);
+    return isCSSTokenizerIdentifier(string.characters16(), length);
+}
+
+static void serializeCharacter(UChar32 c, StringBuilder& appendTo)
+{
+    appendTo.append('\\');
+    appendTo.append(c);
+}
+
+static void serializeCharacterAsCodePoint(UChar32 c, StringBuilder& appendTo)
+{
+    appendTo.append('\\');
+    appendUnsignedAsHex(c, appendTo, Lowercase);
+    appendTo.append(' ');
+}
+
+void serializeIdentifier(const String& identifier, StringBuilder& appendTo, bool skipStartChecks)
+{
+    bool isFirst = !skipStartChecks;
+    bool isSecond = false;
+    bool isFirstCharHyphen = false;
+    unsigned index = 0;
+    while (index < identifier.length()) {
+        UChar32 c = identifier.characterStartingAt(index);
+        if (!c) {
+            // Check for lone surrogate which characterStartingAt does not return.
+            c = identifier[index];
+        }
+
+        index += U16_LENGTH(c);
+
+        if (!c)
+            appendTo.append(0xfffd);
+        else if (c <= 0x1f || c == 0x7f || (0x30 <= c && c <= 0x39 && (isFirst || (isSecond && isFirstCharHyphen))))
+            serializeCharacterAsCodePoint(c, appendTo);
+        else if (c == 0x2d && isFirst && index == identifier.length())
+            serializeCharacter(c, appendTo);
+        else if (0x80 <= c || c == 0x2d || c == 0x5f || (0x30 <= c && c <= 0x39) || (0x41 <= c && c <= 0x5a) || (0x61 <= c && c <= 0x7a))
+            appendTo.append(c);
+        else
+            serializeCharacter(c, appendTo);
+
+        if (isFirst) {
+            isFirst = false;
+            isSecond = true;
+            isFirstCharHyphen = (c == 0x2d);
+        } else if (isSecond)
+            isSecond = false;
+    }
+}
+
+template <typename CharacterType>
+static inline bool isCSSTokenizerURL(const CharacterType* characters, unsigned length)
+{
+    const CharacterType* end = characters + length;
+    
+    for (; characters != end; ++characters) {
+        CharacterType c = characters[0];
+        switch (c) {
+        case '!':
+        case '#':
+        case '$':
+        case '%':
+        case '&':
+            break;
+        default:
+            if (c < '*')
+                return false;
+            if (c <= '~')
+                break;
+            if (c < 128)
+                return false;
+        }
+    }
+    
+    return true;
+}
+
+// "url" from the CSS tokenizer, minus backslash-escape sequences
+static bool isCSSTokenizerURL(const String& string)
+{
+    unsigned length = string.length();
+    
+    if (!length)
+        return true;
+    
+    if (string.is8Bit())
+        return isCSSTokenizerURL(string.characters8(), length);
+    return isCSSTokenizerURL(string.characters16(), length);
+}
+
+void serializeString(const String& string, StringBuilder& appendTo)
+{
+    // FIXME: From the CSS OM draft:
+    // To serialize a string means to create a string represented by '"' (U+0022).
+    // We need to switch to using " instead of ', but this involves patching a large
+    // number of tests and changing editing code to not get confused by double quotes.
+    appendTo.append('"');
+
+    unsigned index = 0;
+    while (index < string.length()) {
+        UChar32 c = string.characterStartingAt(index);
+        index += U16_LENGTH(c);
+
+        if (c <= 0x1f || c == 0x7f)
+            serializeCharacterAsCodePoint(c, appendTo);
+        else if (c == 0x22 || c == 0x5c)
+            serializeCharacter(c, appendTo);
+        else
+            appendTo.append(c);
+    }
+
+    appendTo.append('"');
+}
+
+String serializeString(const String& string)
+{
+    StringBuilder builder;
+    serializeString(string, builder);
+    return builder.toString();
+}
+
+String serializeURL(const String& string)
+{
+    // FIXME: URLS must always be double quoted. From the CSS OM draft:
+    // To serialize a URL means to create a string represented by "url(", followed by
+    // the serialization of the URL as a string, followed by ")".
+    // To keep backwards compatibility with existing tests, for now we only quote if needed and
+    // we use a single quote.
+    return "url(" + (isCSSTokenizerURL(string) ? string : serializeString(string)) + ")";
+}
+
+String serializeAsStringOrCustomIdent(const String& string)
+{
+    if (isCSSTokenizerIdentifier(string)) {
+        StringBuilder builder;
+        serializeIdentifier(string, builder);
+        return builder.toString();
+    }
+    return serializeString(string);
+}
+    
+String serializeFontFamily(const String& string)
+{
+    return isCSSTokenizerIdentifier(string) ? string : serializeString(string);
+}
+
+} // namespace WebCore