A thread-safe Media Query Parser

Source/core/css/parser/CSSToken.cpp

Index: Source/core/css/parser/CSSToken.cpp
diff --git a/Source/core/css/parser/CSSToken.cpp b/Source/core/css/parser/CSSToken.cpp
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+/*
+ * Copyright (C) 2013 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:
+ *
+ *     * 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 "core/css/parser/CSSToken.h"
+
+#include "wtf/HashMap.h"
+#include "wtf/text/StringHash.h"
+
+namespace WebCore {
+
+typedef HashMap<String, CSSPrimitiveValue::UnitTypes> UnitTable;
+
+UnitTable createUnitTable()
+{
+    UnitTable table;
+    table.set(String("em"), CSSPrimitiveValue::CSS_EMS);
+    table.set(String("ex"), CSSPrimitiveValue::CSS_EXS);
+    table.set(String("px"), CSSPrimitiveValue::CSS_PX);
+    table.set(String("cm"), CSSPrimitiveValue::CSS_CM);
+    table.set(String("mm"), CSSPrimitiveValue::CSS_MM);
+    table.set(String("in"), CSSPrimitiveValue::CSS_IN);
+    table.set(String("pt"), CSSPrimitiveValue::CSS_PT);
+    table.set(String("pc"), CSSPrimitiveValue::CSS_PC);
+    table.set(String("deg"), CSSPrimitiveValue::CSS_DEG);
+    table.set(String("rad"), CSSPrimitiveValue::CSS_RAD);
+    table.set(String("grad"), CSSPrimitiveValue::CSS_GRAD);
+    table.set(String("ms"), CSSPrimitiveValue::CSS_MS);
+    table.set(String("s"), CSSPrimitiveValue::CSS_S);
+    table.set(String("hz"), CSSPrimitiveValue::CSS_HZ);
+    table.set(String("khz"), CSSPrimitiveValue::CSS_KHZ);
+    return table;
+}
+
+static UnitTable* getUnitTable()
+{
+    // Allocating to avoid exit time desctructor
+    static UnitTable* unitTable = new UnitTable(createUnitTable());
+    return unitTable;
+}
+
+CSSToken::CSSToken(CSSTokenType type)
+    : m_type(type)
+    , m_delimiter(0)
+    , m_unit(CSSPrimitiveValue::CSS_UNKNOWN)
+{
+}
+
+// Just a helper used for Delim tokens.
+CSSToken::CSSToken(CSSTokenType type, UChar c)
+    : m_type(type)
+    , m_delimiter(c)
+    , m_unit(CSSPrimitiveValue::CSS_UNKNOWN)
+{
+    ASSERT(m_type == DelimToken);
+}
+
+CSSToken::CSSToken(CSSTokenType type, String value)
+    : m_type(type)
+    , m_value(value)
+    , m_delimiter(0)
+    , m_unit(CSSPrimitiveValue::CSS_UNKNOWN)
+{
+}
+
+CSSToken::CSSToken(CSSTokenType type, String name, HashTokenType hashType)
+    : m_type(type)
+    , m_value(name)
+    , m_hashTokenType(hashType)
+    , m_delimiter(0)
+    , m_unit(CSSPrimitiveValue::CSS_UNKNOWN)
+{
+    ASSERT(m_type == HashToken);
+}
+
+CSSToken::CSSToken(CSSTokenType type, String value, double numericValue, NumericValueType numericValueType)
+    : m_type(type)
+    , m_value(value)
+    , m_delimiter(0)
+    , m_numericValueType(numericValueType)
+    , m_numericValue(numericValue)
+    , m_unit(CSSPrimitiveValue::CSS_NUMBER)
+{
+    ASSERT(type == NumberToken);
+}
+
+void CSSToken::convertToDimensionWithUnit(String unit)
+{
+    ASSERT(m_type == NumberToken);
+    m_type = DimensionToken;
+    StringImpl* lowerUnit = unit.lower().impl();
+    if (getUnitTable()->contains(lowerUnit))
+        m_unit = getUnitTable()->get(lowerUnit);
+    else
+        m_unit = CSSPrimitiveValue::CSS_UNKNOWN;
+}
+
+void CSSToken::convertToPercentage()
+{
+    ASSERT(m_type == NumberToken);
+    m_type = PercentageToken;
+    m_unit = CSSPrimitiveValue::CSS_PERCENTAGE;
+}
+
+} // namespace WebCore