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      1 /**
      2  * (C) 1999-2003 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #include "config.h"
     22 #include "core/css/CSSProperty.h"
     23 
     24 #include "core/StylePropertyShorthand.h"
     25 #include "core/css/CSSValueList.h"
     26 #include "core/rendering/style/RenderStyleConstants.h"
     27 
     28 namespace blink {
     29 
     30 struct SameSizeAsCSSProperty {
     31     uint32_t bitfields;
     32     void* value;
     33 };
     34 
     35 COMPILE_ASSERT(sizeof(CSSProperty) == sizeof(SameSizeAsCSSProperty), CSSProperty_should_stay_small);
     36 
     37 CSSPropertyID StylePropertyMetadata::shorthandID() const
     38 {
     39     if (!m_isSetFromShorthand)
     40         return CSSPropertyInvalid;
     41 
     42     Vector<StylePropertyShorthand, 4> shorthands;
     43     getMatchingShorthandsForLonghand(static_cast<CSSPropertyID>(m_propertyID), &shorthands);
     44     ASSERT(shorthands.size() && m_indexInShorthandsVector >= 0 && m_indexInShorthandsVector < shorthands.size());
     45     return shorthands.at(m_indexInShorthandsVector).id();
     46 }
     47 
     48 void CSSProperty::wrapValueInCommaSeparatedList()
     49 {
     50     RefPtrWillBeRawPtr<CSSValue> value = m_value.release();
     51     m_value = CSSValueList::createCommaSeparated();
     52     toCSSValueList(m_value.get())->append(value.release());
     53 }
     54 
     55 enum LogicalBoxSide { BeforeSide, EndSide, AfterSide, StartSide };
     56 enum PhysicalBoxSide { TopSide, RightSide, BottomSide, LeftSide };
     57 
     58 static CSSPropertyID resolveToPhysicalProperty(TextDirection direction, WritingMode writingMode, LogicalBoxSide logicalSide, const StylePropertyShorthand& shorthand)
     59 {
     60     if (direction == LTR) {
     61         if (writingMode == TopToBottomWritingMode) {
     62             // The common case. The logical and physical box sides match.
     63             // Left = Start, Right = End, Before = Top, After = Bottom
     64             return shorthand.properties()[logicalSide];
     65         }
     66 
     67         if (writingMode == BottomToTopWritingMode) {
     68             // Start = Left, End = Right, Before = Bottom, After = Top.
     69             switch (logicalSide) {
     70             case StartSide:
     71                 return shorthand.properties()[LeftSide];
     72             case EndSide:
     73                 return shorthand.properties()[RightSide];
     74             case BeforeSide:
     75                 return shorthand.properties()[BottomSide];
     76             default:
     77                 return shorthand.properties()[TopSide];
     78             }
     79         }
     80 
     81         if (writingMode == LeftToRightWritingMode) {
     82             // Start = Top, End = Bottom, Before = Left, After = Right.
     83             switch (logicalSide) {
     84             case StartSide:
     85                 return shorthand.properties()[TopSide];
     86             case EndSide:
     87                 return shorthand.properties()[BottomSide];
     88             case BeforeSide:
     89                 return shorthand.properties()[LeftSide];
     90             default:
     91                 return shorthand.properties()[RightSide];
     92             }
     93         }
     94 
     95         // Start = Top, End = Bottom, Before = Right, After = Left
     96         switch (logicalSide) {
     97         case StartSide:
     98             return shorthand.properties()[TopSide];
     99         case EndSide:
    100             return shorthand.properties()[BottomSide];
    101         case BeforeSide:
    102             return shorthand.properties()[RightSide];
    103         default:
    104             return shorthand.properties()[LeftSide];
    105         }
    106     }
    107 
    108     if (writingMode == TopToBottomWritingMode) {
    109         // Start = Right, End = Left, Before = Top, After = Bottom
    110         switch (logicalSide) {
    111         case StartSide:
    112             return shorthand.properties()[RightSide];
    113         case EndSide:
    114             return shorthand.properties()[LeftSide];
    115         case BeforeSide:
    116             return shorthand.properties()[TopSide];
    117         default:
    118             return shorthand.properties()[BottomSide];
    119         }
    120     }
    121 
    122     if (writingMode == BottomToTopWritingMode) {
    123         // Start = Right, End = Left, Before = Bottom, After = Top
    124         switch (logicalSide) {
    125         case StartSide:
    126             return shorthand.properties()[RightSide];
    127         case EndSide:
    128             return shorthand.properties()[LeftSide];
    129         case BeforeSide:
    130             return shorthand.properties()[BottomSide];
    131         default:
    132             return shorthand.properties()[TopSide];
    133         }
    134     }
    135 
    136     if (writingMode == LeftToRightWritingMode) {
    137         // Start = Bottom, End = Top, Before = Left, After = Right
    138         switch (logicalSide) {
    139         case StartSide:
    140             return shorthand.properties()[BottomSide];
    141         case EndSide:
    142             return shorthand.properties()[TopSide];
    143         case BeforeSide:
    144             return shorthand.properties()[LeftSide];
    145         default:
    146             return shorthand.properties()[RightSide];
    147         }
    148     }
    149 
    150     // Start = Bottom, End = Top, Before = Right, After = Left
    151     switch (logicalSide) {
    152     case StartSide:
    153         return shorthand.properties()[BottomSide];
    154     case EndSide:
    155         return shorthand.properties()[TopSide];
    156     case BeforeSide:
    157         return shorthand.properties()[RightSide];
    158     default:
    159         return shorthand.properties()[LeftSide];
    160     }
    161 }
    162 
    163 enum LogicalExtent { LogicalWidth, LogicalHeight };
    164 
    165 static CSSPropertyID resolveToPhysicalProperty(WritingMode writingMode, LogicalExtent logicalSide, const CSSPropertyID* properties)
    166 {
    167     if (writingMode == TopToBottomWritingMode || writingMode == BottomToTopWritingMode)
    168         return properties[logicalSide];
    169     return logicalSide == LogicalWidth ? properties[1] : properties[0];
    170 }
    171 
    172 static const StylePropertyShorthand& borderDirections()
    173 {
    174     static const CSSPropertyID properties[4] = { CSSPropertyBorderTop, CSSPropertyBorderRight, CSSPropertyBorderBottom, CSSPropertyBorderLeft };
    175     DEFINE_STATIC_LOCAL(StylePropertyShorthand, borderDirections, (CSSPropertyBorder, properties, WTF_ARRAY_LENGTH(properties)));
    176     return borderDirections;
    177 }
    178 
    179 CSSPropertyID CSSProperty::resolveDirectionAwareProperty(CSSPropertyID propertyID, TextDirection direction, WritingMode writingMode)
    180 {
    181     switch (propertyID) {
    182     case CSSPropertyWebkitMarginEnd:
    183         return resolveToPhysicalProperty(direction, writingMode, EndSide, marginShorthand());
    184     case CSSPropertyWebkitMarginStart:
    185         return resolveToPhysicalProperty(direction, writingMode, StartSide, marginShorthand());
    186     case CSSPropertyWebkitMarginBefore:
    187         return resolveToPhysicalProperty(direction, writingMode, BeforeSide, marginShorthand());
    188     case CSSPropertyWebkitMarginAfter:
    189         return resolveToPhysicalProperty(direction, writingMode, AfterSide, marginShorthand());
    190     case CSSPropertyWebkitPaddingEnd:
    191         return resolveToPhysicalProperty(direction, writingMode, EndSide, paddingShorthand());
    192     case CSSPropertyWebkitPaddingStart:
    193         return resolveToPhysicalProperty(direction, writingMode, StartSide, paddingShorthand());
    194     case CSSPropertyWebkitPaddingBefore:
    195         return resolveToPhysicalProperty(direction, writingMode, BeforeSide, paddingShorthand());
    196     case CSSPropertyWebkitPaddingAfter:
    197         return resolveToPhysicalProperty(direction, writingMode, AfterSide, paddingShorthand());
    198     case CSSPropertyWebkitBorderEnd:
    199         return resolveToPhysicalProperty(direction, writingMode, EndSide, borderDirections());
    200     case CSSPropertyWebkitBorderStart:
    201         return resolveToPhysicalProperty(direction, writingMode, StartSide, borderDirections());
    202     case CSSPropertyWebkitBorderBefore:
    203         return resolveToPhysicalProperty(direction, writingMode, BeforeSide, borderDirections());
    204     case CSSPropertyWebkitBorderAfter:
    205         return resolveToPhysicalProperty(direction, writingMode, AfterSide, borderDirections());
    206     case CSSPropertyWebkitBorderEndColor:
    207         return resolveToPhysicalProperty(direction, writingMode, EndSide, borderColorShorthand());
    208     case CSSPropertyWebkitBorderStartColor:
    209         return resolveToPhysicalProperty(direction, writingMode, StartSide, borderColorShorthand());
    210     case CSSPropertyWebkitBorderBeforeColor:
    211         return resolveToPhysicalProperty(direction, writingMode, BeforeSide, borderColorShorthand());
    212     case CSSPropertyWebkitBorderAfterColor:
    213         return resolveToPhysicalProperty(direction, writingMode, AfterSide, borderColorShorthand());
    214     case CSSPropertyWebkitBorderEndStyle:
    215         return resolveToPhysicalProperty(direction, writingMode, EndSide, borderStyleShorthand());
    216     case CSSPropertyWebkitBorderStartStyle:
    217         return resolveToPhysicalProperty(direction, writingMode, StartSide, borderStyleShorthand());
    218     case CSSPropertyWebkitBorderBeforeStyle:
    219         return resolveToPhysicalProperty(direction, writingMode, BeforeSide, borderStyleShorthand());
    220     case CSSPropertyWebkitBorderAfterStyle:
    221         return resolveToPhysicalProperty(direction, writingMode, AfterSide, borderStyleShorthand());
    222     case CSSPropertyWebkitBorderEndWidth:
    223         return resolveToPhysicalProperty(direction, writingMode, EndSide, borderWidthShorthand());
    224     case CSSPropertyWebkitBorderStartWidth:
    225         return resolveToPhysicalProperty(direction, writingMode, StartSide, borderWidthShorthand());
    226     case CSSPropertyWebkitBorderBeforeWidth:
    227         return resolveToPhysicalProperty(direction, writingMode, BeforeSide, borderWidthShorthand());
    228     case CSSPropertyWebkitBorderAfterWidth:
    229         return resolveToPhysicalProperty(direction, writingMode, AfterSide, borderWidthShorthand());
    230     case CSSPropertyWebkitLogicalWidth: {
    231         const CSSPropertyID properties[2] = { CSSPropertyWidth, CSSPropertyHeight };
    232         return resolveToPhysicalProperty(writingMode, LogicalWidth, properties);
    233     }
    234     case CSSPropertyWebkitLogicalHeight: {
    235         const CSSPropertyID properties[2] = { CSSPropertyWidth, CSSPropertyHeight };
    236         return resolveToPhysicalProperty(writingMode, LogicalHeight, properties);
    237     }
    238     case CSSPropertyWebkitMinLogicalWidth: {
    239         const CSSPropertyID properties[2] = { CSSPropertyMinWidth, CSSPropertyMinHeight };
    240         return resolveToPhysicalProperty(writingMode, LogicalWidth, properties);
    241     }
    242     case CSSPropertyWebkitMinLogicalHeight: {
    243         const CSSPropertyID properties[2] = { CSSPropertyMinWidth, CSSPropertyMinHeight };
    244         return resolveToPhysicalProperty(writingMode, LogicalHeight, properties);
    245     }
    246     case CSSPropertyWebkitMaxLogicalWidth: {
    247         const CSSPropertyID properties[2] = { CSSPropertyMaxWidth, CSSPropertyMaxHeight };
    248         return resolveToPhysicalProperty(writingMode, LogicalWidth, properties);
    249     }
    250     case CSSPropertyWebkitMaxLogicalHeight: {
    251         const CSSPropertyID properties[2] = { CSSPropertyMaxWidth, CSSPropertyMaxHeight };
    252         return resolveToPhysicalProperty(writingMode, LogicalHeight, properties);
    253     }
    254     default:
    255         return propertyID;
    256     }
    257 }
    258 
    259 bool CSSProperty::isAffectedByAllProperty(CSSPropertyID propertyID)
    260 {
    261     if (propertyID == CSSPropertyAll)
    262         return false;
    263 
    264     // all shorthand spec says:
    265     // The all property is a shorthand that resets all CSS properties except
    266     // direction and unicode-bidi. It only accepts the CSS-wide keywords.
    267     // c.f. http://dev.w3.org/csswg/css-cascade/#all-shorthand
    268     // So CSSPropertyUnicodeBidi and CSSPropertyDirection are not
    269     // affected by all property.
    270     return propertyID != CSSPropertyUnicodeBidi && propertyID != CSSPropertyDirection;
    271 }
    272 
    273 } // namespace blink
    274