CSS Custom Properties (Variables)

Source/core/css/resolver/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 41 matching lines @@
 #include "core/css/CSSValueList.h"
 #include "core/css/CSSValuePool.h"
 #include "core/css/ElementRuleCollector.h"
 #include "core/css/FontFace.h"
 #include "core/css/MediaQueryEvaluator.h"
 #include "core/css/PageRuleCollector.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/StyleRuleImport.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/resolver/AnimatedStyleBuilder.h"
+#include "core/css/resolver/CSSVariableResolver.h"
 #include "core/css/resolver/MatchResult.h"
 #include "core/css/resolver/MediaQueryResult.h"
 #include "core/css/resolver/ScopedStyleResolver.h"
 #include "core/css/resolver/SharedStyleFinder.h"
 #include "core/css/resolver/StyleAdjuster.h"
 #include "core/css/resolver/StyleResolverParentScope.h"
 #include "core/css/resolver/StyleResolverState.h"
 #include "core/css/resolver/StyleResolverStats.h"
 #include "core/css/resolver/ViewportStyleResolver.h"
 #include "core/dom/CSSSelectorWatch.h"
@@ skipping 566 matching lines @@
         document().textLinkColors().setTextColor(state.style()->color());
 
     setAnimationUpdateIfNeeded(state, *element);
 
     if (state.style()->hasViewportUnits())
         document().setHasViewportUnits();
 
     if (state.style()->hasRemUnits())
         document().styleEngine().setUsesRemUnit(true);
 
+    if (state.style()->variables())
+        document().styleEngine().setUsesVariables(true);
+
     // Now return the style.
     return state.takeStyle();
 }
 
 // This function is used by the WebAnimations JavaScript API method animate().
 // FIXME: Remove this when animate() switches away from resolution-dependent parsing.
 PassRefPtrWillBeRawPtr<AnimatableValue> StyleResolver::createAnimatableValueSnapshot(Element& element, const ComputedStyle* baseStyle, CSSPropertyID property, CSSValue* value)
 {
     StyleResolverState state(element.document(), &element);
     state.setStyle(baseStyle ? ComputedStyle::clone(*baseStyle) : ComputedStyle::create());
@@ skipping 503 matching lines @@
         || !settings->textTrackTextSize().isEmpty())
         return true;
     return false;
 }
 
 // This method expands the 'all' shorthand property to longhand properties
 // and applies the expanded longhand properties.
 template <CSSPropertyPriority priority>
 void StyleResolver::applyAllProperty(StyleResolverState& state, CSSValue* allValue, bool inheritedOnly)
 {
+    // The 'all' property doesn't apply to variables:
+    // https://drafts.csswg.org/css-variables/#defining-variables
+    if (priority == ResolveVariables)
+        return;
+
     unsigned startCSSProperty = CSSPropertyPriorityData<priority>::first();
     unsigned endCSSProperty = CSSPropertyPriorityData<priority>::last();
 
     for (unsigned i = startCSSProperty; i <= endCSSProperty; ++i) {
         CSSPropertyID propertyId = static_cast<CSSPropertyID>(i);
 
         // StyleBuilder does not allow any expanded shorthands.
         if (isShorthandProperty(propertyId))
             continue;
 
@@ skipping 124 matching lines @@
             // Unfortunately the link status is treated like an inherited property. We need to explicitly restore it.
             state.style()->setInsideLink(linkStatus);
 
             updateFont(state);
 
             return;
         }
         applyInheritedOnly = true;
     }
 
+    // TODO(leviw): We need the proper bit for tracking whether we need to do this work.
+    if (RuntimeEnabledFeatures::cssVariablesEnabled()) {
+        applyMatchedProperties<ResolveVariables>(state, matchResult, false, matchResult.beginAuthor(), matchResult.endAuthor(), applyInheritedOnly);
+        applyMatchedProperties<ResolveVariables>(state, matchResult, true, matchResult.beginAuthor(), matchResult.endAuthor(), applyInheritedOnly);
+        // TODO(leviw): stop recalculating every time
+        CSSVariableResolver::resolveVariableDefinitions(state);
+    }
+
     // Now we have all of the matched rules in the appropriate order. Walk the rules and apply
     // high-priority properties first, i.e., those properties that other properties depend on.
     // The order is (1) high-priority not important, (2) high-priority important, (3) normal not important
     // and (4) normal important.
     applyMatchedProperties<HighPropertyPriority>(state, matchResult, false, matchResult.begin(), matchResult.end(), applyInheritedOnly);
     applyMatchedProperties<HighPropertyPriority>(state, matchResult, true, matchResult.beginAuthor(), matchResult.endAuthor(), applyInheritedOnly);
     applyMatchedProperties<HighPropertyPriority>(state, matchResult, true, matchResult.beginUA(), matchResult.endUA(), applyInheritedOnly);
 
     if (UNLIKELY(isSVGForeignObjectElement(element))) {
         // LayoutSVGRoot handles zooming for the whole SVG subtree, so foreignObject content should not be scaled again.
@@ skipping 122 matching lines @@
     visitor->trace(m_watchedSelectorsRules);
     visitor->trace(m_treeBoundaryCrossingRules);
     visitor->trace(m_styleResourceLoader);
     visitor->trace(m_styleSharingLists);
     visitor->trace(m_pendingStyleSheets);
     visitor->trace(m_document);
 #endif
 }
 
 } // namespace blink