1 files changed, 119 insertions, 0 deletions
diff --git a/Source/WebCore/css/parser/CSSParserTokenRange.cpp b/Source/WebCore/css/parser/CSSParserTokenRange.cpp
new file mode 100644
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+++ b/Source/WebCore/css/parser/CSSParserTokenRange.cpp
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+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Copyright (C) 2016 Apple 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:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * 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.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "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 THE COPYRIGHT
+// OWNER 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 "CSSParserTokenRange.h"
+
+#include "StyleSheetContents.h"
+#include <wtf/NeverDestroyed.h>
+#include <wtf/text/StringBuilder.h>
+
+namespace WebCore {
+
+CSSParserToken& CSSParserTokenRange::eofToken()
+{
+    static NeverDestroyed<CSSParserToken> eofToken(EOFToken);
+    return eofToken.get();
+}
+
+CSSParserTokenRange CSSParserTokenRange::makeSubRange(const CSSParserToken* first, const CSSParserToken* last) const
+{
+    if (first == &eofToken())
+        first = m_last;
+    if (last == &eofToken())
+        last = m_last;
+    ASSERT(first <= last);
+    return CSSParserTokenRange(first, last);
+}
+
+CSSParserTokenRange CSSParserTokenRange::consumeBlock()
+{
+    ASSERT(peek().getBlockType() == CSSParserToken::BlockStart);
+    const CSSParserToken* start = &peek() + 1;
+    unsigned nestingLevel = 0;
+    do {
+        const CSSParserToken& token = consume();
+        if (token.getBlockType() == CSSParserToken::BlockStart)
+            nestingLevel++;
+        else if (token.getBlockType() == CSSParserToken::BlockEnd)
+            nestingLevel--;
+    } while (nestingLevel && m_first < m_last);
+
+    if (nestingLevel)
+        return makeSubRange(start, m_first); // Ended at EOF
+    return makeSubRange(start, m_first - 1);
+}
+
+CSSParserTokenRange CSSParserTokenRange::consumeBlockCheckingForEditability(StyleSheetContents* styleSheet)
+{
+    ASSERT(peek().getBlockType() == CSSParserToken::BlockStart);
+    const auto* start = &peek() + 1;
+    unsigned nestingLevel = 0;
+    do {
+        const auto& token = consume();
+        if (token.getBlockType() == CSSParserToken::BlockStart)
+            nestingLevel++;
+        else if (token.getBlockType() == CSSParserToken::BlockEnd)
+            nestingLevel--;
+
+        if (styleSheet && !styleSheet->usesStyleBasedEditability() && token.type() == IdentToken && equalLettersIgnoringASCIICase(token.value(), "-webkit-user-modify"))
+            styleSheet->parserSetUsesStyleBasedEditability();
+    } while (nestingLevel && m_first < m_last);
+    
+    if (nestingLevel)
+        return makeSubRange(start, m_first); // Ended at EOF
+    return makeSubRange(start, m_first - 1);
+}
+
+void CSSParserTokenRange::consumeComponentValue()
+{
+    // FIXME: This is going to do multiple passes over large sections of a stylesheet.
+    // We should consider optimising this by precomputing where each block ends.
+    unsigned nestingLevel = 0;
+    do {
+        const CSSParserToken& token = consume();
+        if (token.getBlockType() == CSSParserToken::BlockStart)
+            nestingLevel++;
+        else if (token.getBlockType() == CSSParserToken::BlockEnd)
+            nestingLevel--;
+    } while (nestingLevel && m_first < m_last);
+}
+
+String CSSParserTokenRange::serialize() const
+{
+    // We're supposed to insert comments between certain pairs of token types
+    // as per spec, but since this is currently only used for @supports CSSOM
+    // we just get these cases wrong and avoid the additional complexity.
+    StringBuilder builder;
+    for (const CSSParserToken* it = m_first; it < m_last; ++it)
+        it->serialize(builder);
+    return builder.toString();
+}
+
+} // namespace WebCore