Add CSS parser support for break-after, break-before and break-inside.

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

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ skipping 1335 matching lines @@
     for (auto& coordinate : coordinates) {
         auto pair = CSSValueList::createSpaceSeparated();
         pair->append(zoomAdjustedPixelValueForLength(coordinate.x(), style));
         pair->append(zoomAdjustedPixelValueForLength(coordinate.y(), style));
         list->append(pair);
     }
 
     return list.release();
 }
 
+static EBreak mapToPageBreakValue(EBreak genericBreakValue)
+{
+    switch (genericBreakValue) {
+    case BreakAvoidColumn:
+    case BreakAvoidRegion:
+    case BreakColumn:
+    case BreakRecto:
+    case BreakRegion:
+    case BreakVerso:
+        return BreakAuto;
+    case BreakLeft:
+    case BreakRight:
+        // TODO(mstensho): "left" and "right" should simply be mapped to that, not "always", according to spec.
+    case BreakPage:
+        return BreakAlways;
+    case BreakAvoidPage:
+        return BreakAvoid;
+    default:
+        return genericBreakValue;
+    }
+}
+
+static EBreak mapToColumnBreakValue(EBreak genericBreakValue)
+{
+    switch (genericBreakValue) {
+    case BreakAvoidPage:
+    case BreakAvoidRegion:
+    case BreakLeft:
+    case BreakPage:
+    case BreakRecto:
+    case BreakRegion:
+    case BreakRight:
+    case BreakVerso:
+        return BreakAuto;
+    case BreakColumn:
+        return BreakAlways;
+    case BreakAvoidColumn:
+        return BreakAvoid;
+    default:
+        return genericBreakValue;
+    }
+}
+
 PassRefPtrWillBeRawPtr<CSSValue> ComputedStyleCSSValueMapping::get(const AtomicString customPropertyName, const ComputedStyle& style)
 {
     StyleVariableData* variables = style.variables();
     if (!variables)
         return nullptr;
 
     CSSVariableData* data = variables->getVariable(customPropertyName);
     if (!data)
         return nullptr;
 
@@ skipping 194 matching lines @@
         return zoomAdjustedPixelValue(style.columnGap(), style);
     case CSSPropertyWebkitColumnRuleColor:
         return allowVisitedStyle ? cssValuePool().createColorValue(style.visitedDependentColor(CSSPropertyOutlineColor).rgb()) : currentColorOrValidColor(style, style.columnRuleColor());
     case CSSPropertyWebkitColumnRuleStyle:
         return cssValuePool().createValue(style.columnRuleStyle());
     case CSSPropertyWebkitColumnRuleWidth:
         return zoomAdjustedPixelValue(style.columnRuleWidth(), style);
     case CSSPropertyWebkitColumnSpan:
         return cssValuePool().createIdentifierValue(style.columnSpan() ? CSSValueAll : CSSValueNone);
     case CSSPropertyWebkitColumnBreakAfter:
-        return cssValuePool().createValue(style.columnBreakAfter());
+        return cssValuePool().createValue(mapToColumnBreakValue(style.breakAfter()));
     case CSSPropertyWebkitColumnBreakBefore:
-        return cssValuePool().createValue(style.columnBreakBefore());
+        return cssValuePool().createValue(mapToColumnBreakValue(style.breakBefore()));
     case CSSPropertyWebkitColumnBreakInside:
-        return cssValuePool().createValue(style.columnBreakInside());
+        return cssValuePool().createValue(mapToColumnBreakValue(style.breakInside()));
     case CSSPropertyWebkitColumnWidth:
         if (style.hasAutoColumnWidth())
             return cssValuePool().createIdentifierValue(CSSValueAuto);
         return zoomAdjustedPixelValue(style.columnWidth(), style);
     case CSSPropertyTabSize:
         return cssValuePool().createValue(
             style.tabSize().getPixelSize(1.0), style.tabSize().isSpaces() ? CSSPrimitiveValue::UnitType::Number : CSSPrimitiveValue::UnitType::Pixels);
     case CSSPropertyCursor: {
         RefPtrWillBeRawPtr<CSSValueList> list = nullptr;
         CursorList* cursors = style.cursors();
@@ skipping 322 matching lines @@
         if (paddingBottom.isFixed() || !layoutObject || !layoutObject->isBox())
             return zoomAdjustedPixelValueForLength(paddingBottom, style);
         return zoomAdjustedPixelValue(toLayoutBox(layoutObject)->computedCSSPaddingBottom(), style);
     }
     case CSSPropertyPaddingLeft: {
         Length paddingLeft = style.paddingLeft();
         if (paddingLeft.isFixed() || !layoutObject || !layoutObject->isBox())
             return zoomAdjustedPixelValueForLength(paddingLeft, style);
         return zoomAdjustedPixelValue(toLayoutBox(layoutObject)->computedCSSPaddingLeft(), style);
     }
+    case CSSPropertyBreakAfter:
+        return cssValuePool().createValue(style.breakAfter());
+    case CSSPropertyBreakBefore:
+        return cssValuePool().createValue(style.breakBefore());
+    case CSSPropertyBreakInside:
+        return cssValuePool().createValue(style.breakInside());
     case CSSPropertyPageBreakAfter:
-        return cssValuePool().createValue(style.pageBreakAfter());
+        return cssValuePool().createValue(mapToPageBreakValue(style.breakAfter()));
     case CSSPropertyPageBreakBefore:
-        return cssValuePool().createValue(style.pageBreakBefore());
-    case CSSPropertyPageBreakInside: {
-        EPageBreak pageBreak = style.pageBreakInside();
-        ASSERT(pageBreak != PBALWAYS);
-        if (pageBreak == PBALWAYS)
-            return nullptr;
-        return cssValuePool().createValue(style.pageBreakInside());
-    }
+        return cssValuePool().createValue(mapToPageBreakValue(style.breakBefore()));
+    case CSSPropertyPageBreakInside:
+        return cssValuePool().createValue(mapToPageBreakValue(style.breakInside()));
     case CSSPropertyPosition:
         return cssValuePool().createValue(style.position());
     case CSSPropertyQuotes:
         if (!style.quotes()) {
             // TODO(ramya.v): We should return the quote values that we're actually using.
             return nullptr;
         }
         if (style.quotes()->size()) {
             RefPtrWillBeRawPtr<CSSValueList> list = CSSValueList::createSpaceSeparated();
             for (int i = 0; i < style.quotes()->size(); i++) {
@@ skipping 796 matching lines @@
     case CSSPropertyAll:
         return nullptr;
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 } // namespace blink