Add CSS parser support for the snap-height property

third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * 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.
@@ skipping 356 matching lines @@
                 // <page-size>
                 pageSizeType = PAGE_SIZE_RESOLVED;
                 size = getPageSizeFromName(primitiveValue);
             }
         }
     }
     state.style()->setPageSizeType(pageSizeType);
     state.style()->setPageSize(size);
 }
 
+void StyleBuilderFunctions::applyInitialCSSPropertySnapHeight(StyleResolverState& state)
+{
+    state.style()->setSnapHeightUnit(0);
+    state.style()->setSnapHeightPosition(0);
+}
+
+void StyleBuilderFunctions::applyInheritCSSPropertySnapHeight(StyleResolverState& state)
+{
+    state.style()->setSnapHeightUnit(state.parentStyle()->snapHeightUnit());
+    state.style()->setSnapHeightPosition(state.parentStyle()->snapHeightPosition());
+}
+
+void StyleBuilderFunctions::applyValueCSSPropertySnapHeight(StyleResolverState& state, CSSValue* value)
+{
+    CSSValueList* list = toCSSValueList(value);
+    CSSPrimitiveValue* first = toCSSPrimitiveValue(list->item(0));
+    ASSERT(first->isLength());
+    int unit = first->computeLength<int>(state.cssToLengthConversionData());
+    ASSERT(unit >= 0);
+    state.style()->setSnapHeightUnit(clampTo<uint8_t>(unit));
+
+    if (list->length() == 1) {
+        state.style()->setSnapHeightPosition(0);
+        return;
+    }
+
+    ASSERT(list->length() == 2);
+    CSSPrimitiveValue* second = toCSSPrimitiveValue(list->item(1));
+    ASSERT(second->isNumber());
+    int position = second->getIntValue();
+    ASSERT(position > 0 && position <= 100);
+    state.style()->setSnapHeightPosition(position);
+}
+
 void StyleBuilderFunctions::applyValueCSSPropertyTextAlign(StyleResolverState& state, CSSValue* value)
 {
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     if (primitiveValue->isValueID() && primitiveValue->getValueID() != CSSValueWebkitMatchParent)
         state.style()->setTextAlign(primitiveValue->convertTo<ETextAlign>());
     else if (state.parentStyle()->textAlign() == TASTART)
         state.style()->setTextAlign(state.parentStyle()->isLeftToRightDirection() ? LEFT : RIGHT);
     else if (state.parentStyle()->textAlign() == TAEND)
         state.style()->setTextAlign(state.parentStyle()->isLeftToRightDirection() ? RIGHT : LEFT);
     else
@@ skipping 415 matching lines @@
         return;
     case CSSValueSuper:
         svgStyle.setBaselineShift(BS_SUPER);
         return;
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace blink