Throw TypeError if easing string is invalid.

third_party/WebKit/Source/core/animation/AnimationInputHelpers.cpp

 // 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 "core/animation/AnimationInputHelpers.h"
 
+#include "bindings/core/v8/ExceptionState.h"
 #include "core/SVGNames.h"
 #include "core/css/CSSValueList.h"
 #include "core/css/parser/CSSParser.h"
 #include "core/css/resolver/CSSToStyleMap.h"
 #include "core/frame/Deprecation.h"
 #include "core/svg/SVGElement.h"
 #include "core/svg/animation/SVGSMILElement.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
@@ skipping 177 matching lines @@
     String unprefixedProperty = removeSVGPrefix(property);
     QualifiedName attributeName = svgAttributeName(unprefixedProperty);
     const AttributeNameMap& supportedAttributes = getSupportedAttributes();
     auto iter = supportedAttributes.find(attributeName);
     if (iter == supportedAttributes.end() || !svgElement.propertyFromAttribute(*iter->value))
         return nullptr;
 
     return iter->value;
 }
 
-PassRefPtr<TimingFunction> AnimationInputHelpers::parseTimingFunction(const String& string)
+PassRefPtr<TimingFunction> AnimationInputHelpers::parseTimingFunction(const String& string, ExceptionState& exceptionState)
 {
-    if (string.isEmpty())
+    if (string.isEmpty()) {
+        exceptionState.throwTypeError("Easing may not be the empty string");
         return nullptr;
+    }
 
     CSSValue* value = CSSParser::parseSingleValue(CSSPropertyTransitionTimingFunction, string);
     if (!value || !value->isValueList()) {
         ASSERT(!value || value->isCSSWideKeyword());
+        exceptionState.throwTypeError("'" + string + "' is not a valid value for easing");
         return nullptr;
     }
     CSSValueList* valueList = toCSSValueList(value);
-    if (valueList->length() > 1)
+    if (valueList->length() > 1) {
+        exceptionState.throwTypeError("Easing may not be set to a list of values");
         return nullptr;
+    }
     return CSSToStyleMap::mapAnimationTimingFunction(*valueList->item(0), true);
 }
 
 } // namespace blink