A thread safe CSS calc parser for sizes

Source/core/css/parser/MediaQueryCalcParserTest.cpp

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/css/parser/MediaQueryCalcParser.h"
+
+#include "core/css/parser/MediaQueryTokenizer.h"
+
+#include <gtest/gtest.h>
+
+namespace WebCore {
+
+typedef struct {
+    const char* input;
+    const int output;
+} TestCase;
+
+TEST(MediaQueryCalcParserTest, Basic)
+{
+    // The first string represents the input string.
+    // The second string represents the output string, if present.
+    // Otherwise, the output string is identical to the first string.
+    TestCase testCases[] = {
+        {"calc(500px + 10em)", 660},
+        {"calc(500px + 2 * 10em)", 820},
+        {"calc(500px + 2*10em)", 820},
+        {"calc(500px + 50%*10em)", 580},
+        {"calc(500px + (50%*10em + 13px))", 593},
+        {"calc(100vw + (50%*10em + 13px))", 593},
+        {"calc(100vh + (50%*10em + 13px))", 736},
+        {0, 0} // Do not remove the terminator line.
+    };
+
+
+    for (unsigned i = 0; testCases[i].input; ++i) {
+        Vector<MediaQueryToken> tokens;
+        MediaQueryTokenizer::tokenize(testCases[i].input, tokens);
+        int output = MediaQueryCalcParser::parse(tokens.begin(), tokens.end(), 16, 500, 643);
+        ASSERT_EQ(testCases[i].output, output);
+    }
+}
+
+} // namespace