A thread safe CSS calc parser for sizes

Source/core/css/parser/SizesCalcParserTest.cpp

Index: Source/core/css/parser/SizesCalcParserTest.cpp
diff --git a/Source/core/css/parser/SizesCalcParserTest.cpp b/Source/core/css/parser/SizesCalcParserTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..67a6f4d92c28afbb7086ad681daa2ec1a41cdb0e
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+++ b/Source/core/css/parser/SizesCalcParserTest.cpp
@@ -0,0 +1,136 @@
+// 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/SizesCalcParser.h"
+
+#include "core/css/CSSPrimitiveValue.h"
+#include "core/css/MediaValuesCached.h"
+#include "core/css/StylePropertySet.h"
+#include "core/css/parser/MediaQueryTokenizer.h"
+
+#include <gtest/gtest.h>
+
+namespace WebCore {
+
+struct TestCase {
+    const char* input;
+    const unsigned output;
+    const bool valid;
+    const bool dontRunInCSSCalc;
+};
+
+static void initLengthArray(CSSLengthArray& lengthArray)
+{
+    lengthArray.resize(CSSPrimitiveValue::LengthUnitTypeCount);
+    for (size_t i = 0; i < CSSPrimitiveValue::LengthUnitTypeCount; ++i)
+        lengthArray.at(i) = 0;
+}
+
+static void verifyCSSCalc(String text, double value, bool valid, unsigned fontSize, unsigned viewportWidth, unsigned viewportHeight)
+{
+    CSSLengthArray lengthArray;
+    initLengthArray(lengthArray);
+    RefPtr<MutableStylePropertySet> propertySet = MutableStylePropertySet::create();
+    propertySet->setProperty(CSSPropertyLeft, text);
+    RefPtrWillBeRawPtr<CSSValue> cssValue = propertySet->getPropertyCSSValue(CSSPropertyLeft);
+    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(cssValue.get());
+    if (primitiveValue)
+        primitiveValue->accumulateLengthArray(lengthArray);
+    else
+        ASSERT_EQ(valid, false);
+    int length = lengthArray.at(CSSPrimitiveValue::UnitTypePixels);
+    length += lengthArray.at(CSSPrimitiveValue::UnitTypeFontSize) * fontSize;
+    length += lengthArray.at(CSSPrimitiveValue::UnitTypeViewportWidth) * viewportWidth / 100.0;
+    length += lengthArray.at(CSSPrimitiveValue::UnitTypeViewportHeight) * viewportHeight / 100.0;
+    ASSERT_EQ(value, length);
+}
+
+
+TEST(SizesCalcParserTest, Basic)
+{
+    TestCase testCases[] = {
+        {"calc(500px + 10em)", 660, true, false},
+        {"calc(500px + 2 * 10em)", 820, true, false},
+        {"calc(500px + 2*10em)", 820, true, false},
+        {"calc(500px + 0.5*10em)", 580, true, false},
+        {"calc(500px + (0.5*10em + 13px))", 593, true, false},
+        {"calc(100vw + (0.5*10em + 13px))", 593, true, false},
+        {"calc(100vh + (0.5*10em + 13px))", 736, true, false},
+        {"calc(100vh + calc(0.5*10em + 13px))", 736, true, true}, // CSSCalculationValue does not parse internal "calc(".
+        {"calc(100vh + (50%*10em + 13px))", 0, false, false},
+        {"calc(50em+13px)", 0, false, false},
+        {"calc(50em-13px)", 0, false, false},
+        {"calc(500px + 10)", 0, false, false},
+        {"calc(500 + 10)", 0, false, false},
+        {"calc(500px + 10s)", 0, false, true}, // This test ASSERTs in CSSCalculationValue.
+        {"calc(500px + 1cm)", 537, true, false},
+        {"calc(500px - 10s)", 0, false, true}, // This test ASSERTs in CSSCalculationValue.
+        {"calc(500px - 1cm)", 462, true, false},
+        {"calc(50px*10)", 500, true, false},
+        {"calc(50px*10px)", 0, false, false},
+        {"calc(50px/10px)", 0, false, false},
+        {"calc(500px/10)", 50, true, false},
+        {"calc(500/10)", 0, false, false},
+        {"calc(500px/0.5)", 1000, true, false},
+        {"calc(500px/.5)", 1000, true, false},
+        {"calc(500/0)", 0, false, false},
+        {"calc(500px/0)", 0, false, false},
+        {"calc(-500px/10)", 0, true, true}, // CSSCalculationValue does not clamp negative values to 0.
+        {"calc(((4) * ((10px))))", 40, true, false},
+        {"calc(50px / 0)", 0, false, false},
+        {"calc(50px / (10 + 10))", 2, true, false},
+        {"calc(50px / (10 - 10))", 0, false, false},
+        {"calc(50px / (10 * 10))", 0, true, false},
+        {"calc(50px / (10 / 10))", 50, true, false},
+        {"calc(200px*)", 0, false, false},
+        {"calc(+ +200px)", 0, false, false},
+        {"calc()", 0, false, false},
+        {"calc(100px + + +100px)", 0, false, false},
+        {"calc(200px 200px)", 0, false, false},
+        {"calc(100px * * 2)", 0, false, false},
+        {"calc(100px @ 2)", 0, false, false},
+        {"calc(1 flim 2)", 0, false, false},
+        {"calc(100px @ 2)", 0, false, false},
+        {"calc(1 flim 2)", 0, false, false},
+        {"calc(1 flim (2))", 0, false, false},
+        {0, 0, true, false} // Do not remove the terminator line.
+    };
+
+
+    MediaValuesCached::MediaValuesCachedData data;
+    data.viewportWidth = 500;
+    data.viewportHeight = 643;
+    data.deviceWidth = 500;
+    data.deviceHeight = 643;
+    data.devicePixelRatio = 2.0;
+    data.colorBitsPerComponent = 24;
+    data.monochromeBitsPerComponent = 0;
+    data.pointer = MediaValues::MousePointer;
+    data.defaultFontSize = 16;
+    data.threeDEnabled = true;
+    data.scanMediaType = false;
+    data.screenMediaType = true;
+    data.printMediaType = false;
+    data.strictMode = true;
+    RefPtr<MediaValues> mediaValues = MediaValuesCached::create(data);
+
+    for (unsigned i = 0; testCases[i].input; ++i) {
+        Vector<MediaQueryToken> tokens;
+        MediaQueryTokenizer::tokenize(testCases[i].input, tokens);
+        unsigned output;
+        bool valid = SizesCalcParser::parse(tokens.begin(), tokens.end(), mediaValues, output);
+        ASSERT_EQ(testCases[i].valid, valid);
+        if (valid)
+            ASSERT_EQ(testCases[i].output, output);
+    }
+
+    for (unsigned i = 0; testCases[i].input; ++i) {
+        if (testCases[i].dontRunInCSSCalc)
+            continue;
+        verifyCSSCalc(testCases[i].input, testCases[i].output, testCases[i].valid, data.defaultFontSize, data.viewportWidth, data.viewportHeight);
+    }
+}
+
+} // namespace