1 files changed, 107 insertions, 0 deletions
diff --git a/Source/WebCore/css/parser/CSSTokenizerInputStream.h b/Source/WebCore/css/parser/CSSTokenizerInputStream.h
new file mode 100644
index 000000000..96e6e69d0
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+++ b/Source/WebCore/css/parser/CSSTokenizerInputStream.h
@@ -0,0 +1,107 @@
+// 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.
+
+#pragma once
+
+#include <wtf/text/StringView.h>
+
+namespace WebCore {
+
+constexpr LChar kEndOfFileMarker = 0;
+
+class CSSTokenizerInputStream {
+    WTF_MAKE_NONCOPYABLE(CSSTokenizerInputStream);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    explicit CSSTokenizerInputStream(const String& input);
+
+    // Gets the char in the stream replacing NUL characters with a unicode
+    // replacement character. Will return (NUL) kEndOfFileMarker when at the
+    // end of the stream.
+    UChar nextInputChar() const
+    {
+        if (m_offset >= m_stringLength)
+            return '\0';
+        UChar result = (*m_string)[m_offset];
+        return result ? result : 0xFFFD;
+    }
+
+    // Gets the char at lookaheadOffset from the current stream position. Will
+    // return NUL (kEndOfFileMarker) if the stream position is at the end.
+    // NOTE: This may *also* return NUL if there's one in the input! Never
+    // compare the return value to '\0'.
+    UChar peekWithoutReplacement(unsigned lookaheadOffset) const
+    {
+        if ((m_offset + lookaheadOffset) >= m_stringLength)
+            return '\0';
+        return (*m_string)[m_offset + lookaheadOffset];
+    }
+
+    void advance(unsigned offset = 1) { m_offset += offset; }
+    void pushBack(UChar cc)
+    {
+        --m_offset;
+        ASSERT_UNUSED(cc, nextInputChar() == cc);
+    }
+
+    double getDouble(unsigned start, unsigned end) const;
+
+    template<bool characterPredicate(UChar)>
+    unsigned skipWhilePredicate(unsigned offset)
+    {
+        if (m_string->is8Bit()) {
+            const LChar* characters8 = m_string->characters8();
+            while ((m_offset + offset) < m_stringLength && characterPredicate(characters8[m_offset + offset]))
+                ++offset;
+        } else {
+            const UChar* characters16 = m_string->characters16();
+            while ((m_offset + offset) < m_stringLength && characterPredicate(characters16[m_offset + offset]))
+                ++offset;
+        }
+        return offset;
+    }
+
+    void advanceUntilNonWhitespace();
+
+    unsigned length() const { return m_stringLength; }
+    unsigned offset() const { return std::min(m_offset, m_stringLength); }
+
+    StringView rangeAt(unsigned start, unsigned length) const
+    {
+        ASSERT(start + length <= m_stringLength);
+        return StringView(m_string.get()).substring(start, length); // FIXME: Should make a constructor on StringView for this.
+    }
+
+private:
+    size_t m_offset;
+    const size_t m_stringLength;
+    RefPtr<StringImpl> m_string;
+};
+
+} // namespace WebCore