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      1 /*
      2  * Copyright (C) 2011 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *     notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *     notice, this list of conditions and the following disclaimer in the
     11  *     documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #ifndef CSSStyleApplyProperty_h
     26 #define CSSStyleApplyProperty_h
     27 
     28 #include "CSSPropertyNames.h"
     29 #include <wtf/PassRefPtr.h>
     30 #include <wtf/RefCounted.h>
     31 
     32 namespace WebCore {
     33 
     34 class CSSStyleSelector;
     35 class CSSValue;
     36 class ApplyPropertyBase {
     37     WTF_MAKE_NONCOPYABLE(ApplyPropertyBase);
     38     WTF_MAKE_FAST_ALLOCATED;
     39 public:
     40     ApplyPropertyBase() { }
     41     virtual ~ApplyPropertyBase() { }
     42     virtual void applyInheritValue(CSSStyleSelector*) const = 0;
     43     virtual void applyInitialValue(CSSStyleSelector*) const = 0;
     44     virtual void applyValue(CSSStyleSelector*, CSSValue*) const = 0;
     45 };
     46 
     47 class CSSStyleApplyProperty {
     48     WTF_MAKE_NONCOPYABLE(CSSStyleApplyProperty);
     49 public:
     50     static const CSSStyleApplyProperty& sharedCSSStyleApplyProperty();
     51 
     52     void applyInheritValue(CSSPropertyID property, CSSStyleSelector* selector) const
     53     {
     54         ASSERT(implements(property));
     55         propertyValue(property)->applyInheritValue(selector);
     56     }
     57 
     58     void applyInitialValue(CSSPropertyID property, CSSStyleSelector* selector) const
     59     {
     60         ASSERT(implements(property));
     61         propertyValue(property)->applyInitialValue(selector);
     62     }
     63 
     64     void applyValue(CSSPropertyID property, CSSStyleSelector* selector, CSSValue* value) const
     65     {
     66         ASSERT(implements(property));
     67         propertyValue(property)->applyValue(selector, value);
     68     }
     69 
     70     bool implements(CSSPropertyID property) const
     71     {
     72         return propertyValue(property);
     73     }
     74 
     75 private:
     76     CSSStyleApplyProperty();
     77     static int index(CSSPropertyID property)
     78     {
     79         return property - firstCSSProperty;
     80     }
     81 
     82     static bool valid(CSSPropertyID property)
     83     {
     84         int i = index(property);
     85         return i >= 0 && i < numCSSProperties;
     86     }
     87 
     88     void setPropertyValue(CSSPropertyID property, ApplyPropertyBase* value)
     89     {
     90         ASSERT(valid(property));
     91         m_propertyMap[index(property)] = value;
     92     }
     93 
     94     void setPropertyValue(CSSPropertyID newProperty, CSSPropertyID equivalentProperty)
     95     {
     96         ASSERT(valid(newProperty));
     97         ASSERT(valid(equivalentProperty));
     98         m_propertyMap[index(newProperty)] = m_propertyMap[index(equivalentProperty)];
     99     }
    100 
    101     ApplyPropertyBase* propertyValue(CSSPropertyID property) const
    102     {
    103         ASSERT(valid(property));
    104         return m_propertyMap[index(property)];
    105     }
    106 
    107     ApplyPropertyBase* m_propertyMap[numCSSProperties];
    108 };
    109 
    110 }
    111 
    112 #endif // CSSStyleApplyProperty_h
    113