Split CSSPrimitiveValue into CSSPrimitiveValue and CSSIdentifierValue

third_party/WebKit/Source/core/css/CSSGradientValue.cpp

 /*
  * Copyright (C) 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2015 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 10 matching lines @@
  * 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 "core/css/CSSGradientValue.h"
 
 #include "core/CSSValueKeywords.h"
 #include "core/css/CSSCalculationValue.h"
+#include "core/css/CSSIdentifierValue.h"
 #include "core/css/CSSToLengthConversionData.h"
 #include "core/css/CSSValuePair.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/TextLinkColors.h"
 #include "core/layout/LayoutObject.h"
 #include "core/layout/api/LayoutViewItem.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/Gradient.h"
 #include "platform/graphics/GradientGeneratedImage.h"
 #include "platform/graphics/Image.h"
 #include "platform/graphics/skia/SkiaUtils.h"
 #include "wtf/text/StringBuilder.h"
 #include "wtf/text/WTFString.h"
 #include <algorithm>
 #include <utility>
 
 namespace blink {
 
+namespace {
+
+static bool colorIsDerivedFromElement(const CSSIdentifierValue& value)
+{
+    CSSValueID valueID = value.getValueID();
+    switch (valueID) {
+    case CSSValueInternalQuirkInherit:
+    case CSSValueWebkitLink:
+    case CSSValueWebkitActivelink:
+    case CSSValueCurrentcolor:
+        return true;
+    default:
+        return false;
+    }
+}
+
+}
+
 DEFINE_TRACE(CSSGradientColorStop)
 {
     visitor->trace(m_position);
     visitor->trace(m_color);
 }
 
 PassRefPtr<Image> CSSGradientValue::image(const LayoutObject& layoutObject, const IntSize& size)
 {
     if (size.isEmpty())
         return nullptr;
@@ skipping 425 matching lines @@
 static float positionFromValue(const CSSValue* value, const CSSToLengthConversionData& conversionData, const IntSize& size, bool isHorizontal)
 {
     int origin = 0;
     int sign = 1;
     int edgeDistance = isHorizontal ? size.width() : size.height();
 
     // In this case the center of the gradient is given relative to an edge in the form of:
     // [ top | bottom | right | left ] [ <percentage> | <length> ].
     if (value->isValuePair()) {
         const CSSValuePair& pair = toCSSValuePair(*value);
-        CSSValueID originID = toCSSPrimitiveValue(pair.first()).getValueID();
+        CSSValueID originID = toCSSIdentifierValue(pair.first()).getValueID();
         value = &pair.second();
 
         if (originID == CSSValueRight || originID == CSSValueBottom) {
             // For right/bottom, the offset is relative to the far edge.
             origin = edgeDistance;
             sign = -1;
         }
     }
 
+    if (value->isIdentifierValue()) {
+        switch (toCSSIdentifierValue(value)->getValueID()) {
+        case CSSValueTop:
+            DCHECK(!isHorizontal);
+            return 0;
+        case CSSValueLeft:
+            DCHECK(isHorizontal);
+            return 0;
+        case CSSValueBottom:
+            DCHECK(!isHorizontal);
+            return size.height();
+        case CSSValueRight:
+            DCHECK(isHorizontal);
+            return size.width();
+        case CSSValueCenter:
+            return origin + sign * .5f * edgeDistance;
+        default:
+            NOTREACHED();
+            break;
+        }
+    }
+
     const CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
 
     if (primitiveValue->isNumber())
         return origin + sign * primitiveValue->getFloatValue() * conversionData.zoom();
 
     if (primitiveValue->isPercentage())
         return origin + sign * primitiveValue->getFloatValue() / 100.f * edgeDistance;
 
     if (primitiveValue->isCalculatedPercentageWithLength())
         return origin + sign * primitiveValue->cssCalcValue()->toCalcValue(conversionData)->evaluate(edgeDistance);
 
-    switch (primitiveValue->getValueID()) {
-    case CSSValueTop:
-        ASSERT(!isHorizontal);
-        return 0;
-    case CSSValueLeft:
-        ASSERT(isHorizontal);
-        return 0;
-    case CSSValueBottom:
-        ASSERT(!isHorizontal);
-        return size.height();
-    case CSSValueRight:
-        ASSERT(isHorizontal);
-        return size.width();
-    case CSSValueCenter:
-        return origin + sign * .5f * edgeDistance;
-    default:
-        break;
-    }
-
     return origin + sign * primitiveValue->computeLength<float>(conversionData);
 }
 
 FloatPoint CSSGradientValue::computeEndPoint(CSSValue* horizontal, CSSValue* vertical, const CSSToLengthConversionData& conversionData, const IntSize& size)
 {
     FloatPoint result;
 
     if (horizontal)
         result.setX(positionFromValue(horizontal, conversionData, size, true));
 
     if (vertical)
         result.setY(positionFromValue(vertical, conversionData, size, false));
 
     return result;
 }
 
 bool CSSGradientValue::isCacheable() const
 {
     for (size_t i = 0; i < m_stops.size(); ++i) {
         const CSSGradientColorStop& stop = m_stops[i];
 
-        if (!stop.isHint() && stop.m_color->isPrimitiveValue() && toCSSPrimitiveValue(*stop.m_color).colorIsDerivedFromElement())
+        if (!stop.isHint() && stop.m_color->isIdentifierValue() && colorIsDerivedFromElement(toCSSIdentifierValue(*stop.m_color)))
             return false;
 
         if (!stop.m_position)
             continue;
 
         if (stop.m_position->isFontRelativeLength())
             return false;
     }
 
     return true;
@@ skipping 75 matching lines @@
         if (m_repeating)
             result.append("repeating-linear-gradient(");
         else
             result.append("linear-gradient(");
 
         bool wroteSomething = false;
 
         if (m_angle && m_angle->computeDegrees() != 180) {
             result.append(m_angle->cssText());
             wroteSomething = true;
-        } else if ((m_firstX || m_firstY) && !(!m_firstX && m_firstY && m_firstY->isPrimitiveValue() && toCSSPrimitiveValue(m_firstY.get())->getValueID() == CSSValueBottom)) {
+        } else if ((m_firstX || m_firstY) && !(!m_firstX && m_firstY && m_firstY->isIdentifierValue() && toCSSIdentifierValue(m_firstY.get())->getValueID() == CSSValueBottom)) {
             result.append("to ");
             if (m_firstX && m_firstY) {
                 result.append(m_firstX->cssText());
                 result.append(' ');
                 result.append(m_firstY->cssText());
             } else if (m_firstX)
                 result.append(m_firstX->cssText());
             else
                 result.append(m_firstY->cssText());
             wroteSomething = true;
@@ skipping 115 matching lines @@
             if (m_firstX)
                 secondPoint.setX(size.width() - firstPoint.x());
             if (m_firstY)
                 secondPoint.setY(size.height() - firstPoint.y());
             break;
         case CSSLinearGradient:
             if (m_firstX && m_firstY) {
                 // "Magic" corners, so the 50% line touches two corners.
                 float rise = size.width();
                 float run = size.height();
-                if (m_firstX && m_firstX->isPrimitiveValue() && toCSSPrimitiveValue(m_firstX.get())->getValueID() == CSSValueLeft)
+                if (m_firstX && m_firstX->isIdentifierValue() && toCSSIdentifierValue(m_firstX.get())->getValueID() == CSSValueLeft)
                     run *= -1;
-                if (m_firstY && m_firstY->isPrimitiveValue() && toCSSPrimitiveValue(m_firstY.get())->getValueID() == CSSValueBottom)
+                if (m_firstY && m_firstY->isIdentifierValue() && toCSSIdentifierValue(m_firstY.get())->getValueID() == CSSValueBottom)
                     rise *= -1;
                 // Compute angle, and flip it back to "bearing angle" degrees.
                 float angle = 90 - rad2deg(atan2(rise, run));
                 endPointsFromAngle(angle, size, firstPoint, secondPoint, m_gradientType);
             } else if (m_firstX || m_firstY) {
                 secondPoint = computeEndPoint(m_firstX.get(), m_firstY.get(), conversionData, size);
                 if (m_firstX)
                     firstPoint.setX(size.width() - secondPoint.x());
                 if (m_firstY)
                     firstPoint.setY(size.height() - secondPoint.y());
@@ skipping 427 matching lines @@
     visitor->trace(m_firstRadius);
     visitor->trace(m_secondRadius);
     visitor->trace(m_shape);
     visitor->trace(m_sizingBehavior);
     visitor->trace(m_endHorizontalSize);
     visitor->trace(m_endVerticalSize);
     CSSGradientValue::traceAfterDispatch(visitor);
 }
 
 } // namespace blink