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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  *     * Redistributions of source code must retain the above copyright
      5  * notice, this list of conditions and the following disclaimer.
      6  *     * Redistributions in binary form must reproduce the above
      7  * copyright notice, this list of conditions and the following disclaimer
      8  * in the documentation and/or other materials provided with the
      9  * distribution.
     10  *     * Neither the name of Google Inc. nor the names of its
     11  * contributors may be used to endorse or promote products derived from
     12  * this software without specific prior written permission.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     15  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     16  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     17  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     18  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     19  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     20  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #ifndef StyleBuilderConverter_h
     28 #define StyleBuilderConverter_h
     29 
     30 #include "core/css/CSSValue.h"
     31 #include "core/css/resolver/StyleResolverState.h"
     32 #include "core/rendering/RenderView.h"
     33 #include "core/rendering/style/ShadowList.h"
     34 #include "core/svg/SVGLength.h"
     35 #include "platform/LengthSize.h"
     36 
     37 namespace WebCore {
     38 
     39 // Note that we assume the parser only allows valid CSSValue types.
     40 
     41 class StyleBuilderConverter {
     42 public:
     43     static String convertFragmentIdentifier(StyleResolverState&, CSSValue*);
     44     template <typename T> static T convertComputedLength(StyleResolverState&, CSSValue*);
     45     template <typename T> static T convertLineWidth(StyleResolverState&, CSSValue*);
     46     static Length convertLength(StyleResolverState&, CSSValue*);
     47     static Length convertLengthOrAuto(StyleResolverState&, CSSValue*);
     48     static Length convertLengthSizing(StyleResolverState&, CSSValue*);
     49     static Length convertLengthMaxSizing(StyleResolverState&, CSSValue*);
     50     static LengthPoint convertLengthPoint(StyleResolverState&, CSSValue*);
     51     static float convertNumberOrPercentage(StyleResolverState&, CSSValue*);
     52     static LengthSize convertRadius(StyleResolverState&, CSSValue*);
     53     static PassRefPtr<ShadowList> convertShadow(StyleResolverState&, CSSValue*);
     54     static float convertSpacing(StyleResolverState&, CSSValue*);
     55     template <CSSValueID IdForNone> static AtomicString convertString(StyleResolverState&, CSSValue*);
     56     static SVGLength convertSVGLength(StyleResolverState&, CSSValue*);
     57 };
     58 
     59 template <typename T>
     60 T StyleBuilderConverter::convertComputedLength(StyleResolverState& state, CSSValue* value)
     61 {
     62     return toCSSPrimitiveValue(value)->computeLength<T>(state.cssToLengthConversionData());
     63 }
     64 
     65 template <typename T>
     66 T StyleBuilderConverter::convertLineWidth(StyleResolverState& state, CSSValue* value)
     67 {
     68     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     69     CSSValueID valueID = primitiveValue->getValueID();
     70     if (valueID == CSSValueThin)
     71         return 1;
     72     if (valueID == CSSValueMedium)
     73         return 3;
     74     if (valueID == CSSValueThick)
     75         return 5;
     76     if (primitiveValue->isViewportPercentageLength())
     77         return intValueForLength(primitiveValue->viewportPercentageLength(), 0, state.document().renderView());
     78     if (valueID == CSSValueInvalid) {
     79         // Any original result that was >= 1 should not be allowed to fall below 1.
     80         // This keeps border lines from vanishing.
     81         T result = primitiveValue->computeLength<T>(state.cssToLengthConversionData());
     82         if (state.style()->effectiveZoom() < 1.0f && result < 1.0) {
     83             T originalLength = primitiveValue->computeLength<T>(state.cssToLengthConversionData().copyWithAdjustedZoom(1.0));
     84             if (originalLength >= 1.0)
     85                 return 1.0;
     86         }
     87         return result;
     88     }
     89     ASSERT_NOT_REACHED();
     90     return 0;
     91 }
     92 
     93 template <CSSValueID IdForNone>
     94 AtomicString StyleBuilderConverter::convertString(StyleResolverState&, CSSValue* value)
     95 {
     96     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     97     if (primitiveValue->getValueID() == IdForNone)
     98         return nullAtom;
     99     return primitiveValue->getStringValue();
    100 }
    101 
    102 } // namespace WebCore
    103 
    104 #endif
    105