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flutter_flutter/engine/core/css/StylePropertySerializer.cpp
Eric Seidel e0fd75b5ab Make absolute and sort all Sky headers 
This caused us to lose our gn check certification. :(

Turns out gn check was just ignoring all the header
paths it didn't understand and so gn check passing
for sky wasn't meaning much.  I tried to straighten
out some of the mess in this CL, but its going to take
several more rounds of massaging before gn check
passes again.  On the bright side (almost) all of
our headers are absolute now.  Turns out my script
(attached to the bug) didn't notice ../ includes
but I'll fix that in the next patch.

R=abarth@chromium.org
BUG=435361

Review URL: https://codereview.chromium.org/746023002
2014-11-20 17:42:05 -08:00

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/*
* (C) 1999-2003 Lars Knoll (knoll@kde.org)
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
* Copyright (C) 2011 Research In Motion Limited. All rights reserved.
* Copyright (C) 2013 Intel Corporation. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "sky/engine/config.h"
#include "sky/engine/core/css/StylePropertySerializer.h"
#include "gen/sky/core/CSSValueKeywords.h"
#include "gen/sky/core/StylePropertyShorthand.h"
#include "sky/engine/core/css/CSSPropertyMetadata.h"
#include "sky/engine/wtf/BitArray.h"
#include "sky/engine/wtf/text/StringBuilder.h"
namespace blink {
static bool isInitialOrInherit(const String& value)
{
DEFINE_STATIC_LOCAL(String, initial, ("initial"));
DEFINE_STATIC_LOCAL(String, inherit, ("inherit"));
return value.length() == 7 && (value == initial || value == inherit);
}
StylePropertySerializer::StylePropertySerializer(const StylePropertySet& properties)
: m_propertySet(properties)
{
}
String StylePropertySerializer::getPropertyText(CSSPropertyID propertyID, const String& value, bool isImportant, bool isNotFirstDecl) const
{
StringBuilder result;
if (isNotFirstDecl)
result.append(' ');
result.append(getPropertyName(propertyID));
result.appendLiteral(": ");
result.append(value);
if (isImportant)
result.appendLiteral(" !important");
result.append(';');
return result.toString();
}
String StylePropertySerializer::asText() const
{
StringBuilder result;
BitArray<numCSSProperties> shorthandPropertyUsed;
BitArray<numCSSProperties> shorthandPropertyAppeared;
unsigned size = m_propertySet.propertyCount();
unsigned numDecls = 0;
for (unsigned n = 0; n < size; ++n) {
StylePropertySet::PropertyReference property = m_propertySet.propertyAt(n);
CSSPropertyID propertyID = property.id();
// Only enabled or internal properties should be part of the style.
ASSERT(CSSPropertyMetadata::isEnabledProperty(propertyID) || isInternalProperty(propertyID));
CSSPropertyID shorthandPropertyID = CSSPropertyInvalid;
CSSPropertyID borderFallbackShorthandProperty = CSSPropertyInvalid;
String value;
switch (propertyID) {
case CSSPropertyBackgroundAttachment:
case CSSPropertyBackgroundClip:
case CSSPropertyBackgroundColor:
case CSSPropertyBackgroundImage:
case CSSPropertyBackgroundOrigin:
case CSSPropertyBackgroundPositionX:
case CSSPropertyBackgroundPositionY:
case CSSPropertyBackgroundSize:
case CSSPropertyBackgroundRepeatX:
case CSSPropertyBackgroundRepeatY:
shorthandPropertyAppeared.set(CSSPropertyBackground - firstCSSProperty);
continue;
case CSSPropertyBorderTopWidth:
case CSSPropertyBorderRightWidth:
case CSSPropertyBorderBottomWidth:
case CSSPropertyBorderLeftWidth:
if (!borderFallbackShorthandProperty)
borderFallbackShorthandProperty = CSSPropertyBorderWidth;
case CSSPropertyBorderTopStyle:
case CSSPropertyBorderRightStyle:
case CSSPropertyBorderBottomStyle:
case CSSPropertyBorderLeftStyle:
if (!borderFallbackShorthandProperty)
borderFallbackShorthandProperty = CSSPropertyBorderStyle;
case CSSPropertyBorderTopColor:
case CSSPropertyBorderRightColor:
case CSSPropertyBorderBottomColor:
case CSSPropertyBorderLeftColor:
if (!borderFallbackShorthandProperty)
borderFallbackShorthandProperty = CSSPropertyBorderColor;
// FIXME: Deal with cases where only some of border-(top|right|bottom|left) are specified.
if (!shorthandPropertyAppeared.get(CSSPropertyBorder - firstCSSProperty)) {
value = borderPropertyValue(ReturnNullOnUncommonValues);
if (value.isNull())
shorthandPropertyAppeared.set(CSSPropertyBorder - firstCSSProperty);
else
shorthandPropertyID = CSSPropertyBorder;
} else if (shorthandPropertyUsed.get(CSSPropertyBorder - firstCSSProperty))
shorthandPropertyID = CSSPropertyBorder;
if (!shorthandPropertyID)
shorthandPropertyID = borderFallbackShorthandProperty;
break;
case CSSPropertyWebkitBorderHorizontalSpacing:
case CSSPropertyWebkitBorderVerticalSpacing:
shorthandPropertyID = CSSPropertyBorderSpacing;
break;
case CSSPropertyFontFamily:
case CSSPropertyLineHeight:
case CSSPropertyFontSize:
case CSSPropertyFontStretch:
case CSSPropertyFontStyle:
case CSSPropertyFontVariant:
case CSSPropertyFontWeight:
// Don't use CSSPropertyFont because old UAs can't recognize them but are important for editing.
break;
case CSSPropertyListStyleType:
case CSSPropertyListStylePosition:
case CSSPropertyListStyleImage:
shorthandPropertyID = CSSPropertyListStyle;
break;
case CSSPropertyMarginTop:
case CSSPropertyMarginRight:
case CSSPropertyMarginBottom:
case CSSPropertyMarginLeft:
shorthandPropertyID = CSSPropertyMargin;
break;
case CSSPropertyOutlineWidth:
case CSSPropertyOutlineStyle:
case CSSPropertyOutlineColor:
shorthandPropertyID = CSSPropertyOutline;
break;
case CSSPropertyOverflowX:
case CSSPropertyOverflowY:
shorthandPropertyID = CSSPropertyOverflow;
break;
case CSSPropertyPaddingTop:
case CSSPropertyPaddingRight:
case CSSPropertyPaddingBottom:
case CSSPropertyPaddingLeft:
shorthandPropertyID = CSSPropertyPadding;
break;
case CSSPropertyTransitionProperty:
case CSSPropertyTransitionDuration:
case CSSPropertyTransitionTimingFunction:
case CSSPropertyTransitionDelay:
shorthandPropertyID = CSSPropertyTransition;
break;
case CSSPropertyWebkitAnimationName:
case CSSPropertyWebkitAnimationDuration:
case CSSPropertyWebkitAnimationTimingFunction:
case CSSPropertyWebkitAnimationDelay:
case CSSPropertyWebkitAnimationIterationCount:
case CSSPropertyWebkitAnimationDirection:
case CSSPropertyWebkitAnimationFillMode:
shorthandPropertyID = CSSPropertyWebkitAnimation;
break;
case CSSPropertyFlexDirection:
case CSSPropertyFlexWrap:
shorthandPropertyID = CSSPropertyFlexFlow;
break;
case CSSPropertyFlexBasis:
case CSSPropertyFlexGrow:
case CSSPropertyFlexShrink:
shorthandPropertyID = CSSPropertyFlex;
break;
case CSSPropertyWebkitMaskPositionX:
case CSSPropertyWebkitMaskPositionY:
case CSSPropertyWebkitMaskRepeatX:
case CSSPropertyWebkitMaskRepeatY:
case CSSPropertyWebkitMaskImage:
case CSSPropertyWebkitMaskRepeat:
case CSSPropertyWebkitMaskPosition:
case CSSPropertyWebkitMaskClip:
case CSSPropertyWebkitMaskOrigin:
shorthandPropertyID = CSSPropertyWebkitMask;
break;
case CSSPropertyWebkitTransformOriginX:
case CSSPropertyWebkitTransformOriginY:
case CSSPropertyWebkitTransformOriginZ:
shorthandPropertyID = CSSPropertyWebkitTransformOrigin;
break;
case CSSPropertyWebkitTransitionProperty:
case CSSPropertyWebkitTransitionDuration:
case CSSPropertyWebkitTransitionTimingFunction:
case CSSPropertyWebkitTransitionDelay:
shorthandPropertyID = CSSPropertyWebkitTransition;
break;
default:
break;
}
unsigned shortPropertyIndex = shorthandPropertyID - firstCSSProperty;
if (shorthandPropertyID) {
if (shorthandPropertyUsed.get(shortPropertyIndex))
continue;
if (!shorthandPropertyAppeared.get(shortPropertyIndex) && value.isNull())
value = m_propertySet.getPropertyValue(shorthandPropertyID);
shorthandPropertyAppeared.set(shortPropertyIndex);
}
if (!value.isNull()) {
if (shorthandPropertyID) {
propertyID = shorthandPropertyID;
shorthandPropertyUsed.set(shortPropertyIndex);
}
} else
value = property.value()->cssText();
if (value == "initial" && !CSSPropertyMetadata::isInheritedProperty(propertyID))
continue;
result.append(getPropertyText(propertyID, value, property.isImportant(), numDecls++));
}
if (shorthandPropertyAppeared.get(CSSPropertyBackground - firstCSSProperty))
appendBackgroundPropertyAsText(result, numDecls);
ASSERT(!numDecls ^ !result.isEmpty());
return result.toString();
}
String StylePropertySerializer::getPropertyValue(CSSPropertyID propertyID) const
{
// Shorthand and 4-values properties
switch (propertyID) {
case CSSPropertyAnimation:
return getLayeredShorthandValue(animationShorthand());
case CSSPropertyBorderSpacing:
return borderSpacingValue(borderSpacingShorthand());
case CSSPropertyBackgroundPosition:
return getLayeredShorthandValue(backgroundPositionShorthand());
case CSSPropertyBackgroundRepeat:
return backgroundRepeatPropertyValue();
case CSSPropertyBackground:
return getLayeredShorthandValue(backgroundShorthand());
case CSSPropertyBorder:
return borderPropertyValue(OmitUncommonValues);
case CSSPropertyBorderTop:
return getShorthandValue(borderTopShorthand());
case CSSPropertyBorderRight:
return getShorthandValue(borderRightShorthand());
case CSSPropertyBorderBottom:
return getShorthandValue(borderBottomShorthand());
case CSSPropertyBorderLeft:
return getShorthandValue(borderLeftShorthand());
case CSSPropertyOutline:
return getShorthandValue(outlineShorthand());
case CSSPropertyBorderColor:
return get4Values(borderColorShorthand());
case CSSPropertyBorderWidth:
return get4Values(borderWidthShorthand());
case CSSPropertyBorderStyle:
return get4Values(borderStyleShorthand());
case CSSPropertyFlex:
return getShorthandValue(flexShorthand());
case CSSPropertyFlexFlow:
return getShorthandValue(flexFlowShorthand());
case CSSPropertyFont:
return fontValue();
case CSSPropertyMargin:
return get4Values(marginShorthand());
case CSSPropertyWebkitMarginCollapse:
return getShorthandValue(webkitMarginCollapseShorthand());
case CSSPropertyOverflow:
return getCommonValue(overflowShorthand());
case CSSPropertyPadding:
return get4Values(paddingShorthand());
case CSSPropertyTransition:
return getLayeredShorthandValue(transitionShorthand());
case CSSPropertyListStyle:
return getShorthandValue(listStyleShorthand());
case CSSPropertyWebkitMaskPosition:
return getLayeredShorthandValue(webkitMaskPositionShorthand());
case CSSPropertyWebkitMaskRepeat:
return getLayeredShorthandValue(webkitMaskRepeatShorthand());
case CSSPropertyWebkitMask:
return getLayeredShorthandValue(webkitMaskShorthand());
case CSSPropertyWebkitTextEmphasis:
return getShorthandValue(webkitTextEmphasisShorthand());
case CSSPropertyWebkitTextStroke:
return getShorthandValue(webkitTextStrokeShorthand());
case CSSPropertyTransformOrigin:
case CSSPropertyWebkitTransformOrigin:
return getShorthandValue(webkitTransformOriginShorthand());
case CSSPropertyWebkitTransition:
return getLayeredShorthandValue(webkitTransitionShorthand());
case CSSPropertyWebkitAnimation:
return getLayeredShorthandValue(webkitAnimationShorthand());
case CSSPropertyBorderRadius:
return get4Values(borderRadiusShorthand());
default:
return String();
}
}
String StylePropertySerializer::borderSpacingValue(const StylePropertyShorthand& shorthand) const
{
RefPtr<CSSValue> horizontalValue = m_propertySet.getPropertyCSSValue(shorthand.properties()[0]);
RefPtr<CSSValue> verticalValue = m_propertySet.getPropertyCSSValue(shorthand.properties()[1]);
// While standard border-spacing property does not allow specifying border-spacing-vertical without
// specifying border-spacing-horizontal <http://www.w3.org/TR/CSS21/tables.html#separated-borders>,
// -webkit-border-spacing-vertical can be set without -webkit-border-spacing-horizontal.
if (!horizontalValue || !verticalValue)
return String();
String horizontalValueCSSText = horizontalValue->cssText();
String verticalValueCSSText = verticalValue->cssText();
if (horizontalValueCSSText == verticalValueCSSText)
return horizontalValueCSSText;
return horizontalValueCSSText + ' ' + verticalValueCSSText;
}
void StylePropertySerializer::appendFontLonghandValueIfExplicit(CSSPropertyID propertyID, StringBuilder& result, String& commonValue) const
{
int foundPropertyIndex = m_propertySet.findPropertyIndex(propertyID);
if (foundPropertyIndex == -1)
return; // All longhands must have at least implicit values if "font" is specified.
if (m_propertySet.propertyAt(foundPropertyIndex).isImplicit()) {
commonValue = String();
return;
}
char prefix = '\0';
switch (propertyID) {
case CSSPropertyFontStyle:
break; // No prefix.
case CSSPropertyFontFamily:
case CSSPropertyFontStretch:
case CSSPropertyFontVariant:
case CSSPropertyFontWeight:
prefix = ' ';
break;
case CSSPropertyLineHeight:
prefix = '/';
break;
default:
ASSERT_NOT_REACHED();
}
if (prefix && !result.isEmpty())
result.append(prefix);
String value = m_propertySet.propertyAt(foundPropertyIndex).value()->cssText();
result.append(value);
if (!commonValue.isNull() && commonValue != value)
commonValue = String();
}
String StylePropertySerializer::fontValue() const
{
int fontSizePropertyIndex = m_propertySet.findPropertyIndex(CSSPropertyFontSize);
int fontFamilyPropertyIndex = m_propertySet.findPropertyIndex(CSSPropertyFontFamily);
if (fontSizePropertyIndex == -1 || fontFamilyPropertyIndex == -1)
return emptyString();
StylePropertySet::PropertyReference fontSizeProperty = m_propertySet.propertyAt(fontSizePropertyIndex);
StylePropertySet::PropertyReference fontFamilyProperty = m_propertySet.propertyAt(fontFamilyPropertyIndex);
if (fontSizeProperty.isImplicit() || fontFamilyProperty.isImplicit())
return emptyString();
String commonValue = fontSizeProperty.value()->cssText();
StringBuilder result;
appendFontLonghandValueIfExplicit(CSSPropertyFontStyle, result, commonValue);
appendFontLonghandValueIfExplicit(CSSPropertyFontVariant, result, commonValue);
appendFontLonghandValueIfExplicit(CSSPropertyFontWeight, result, commonValue);
appendFontLonghandValueIfExplicit(CSSPropertyFontStretch, result, commonValue);
if (!result.isEmpty())
result.append(' ');
result.append(fontSizeProperty.value()->cssText());
appendFontLonghandValueIfExplicit(CSSPropertyLineHeight, result, commonValue);
if (!result.isEmpty())
result.append(' ');
result.append(fontFamilyProperty.value()->cssText());
if (isInitialOrInherit(commonValue))
return commonValue;
return result.toString();
}
String StylePropertySerializer::get4Values(const StylePropertyShorthand& shorthand) const
{
// Assume the properties are in the usual order top, right, bottom, left.
int topValueIndex = m_propertySet.findPropertyIndex(shorthand.properties()[0]);
int rightValueIndex = m_propertySet.findPropertyIndex(shorthand.properties()[1]);
int bottomValueIndex = m_propertySet.findPropertyIndex(shorthand.properties()[2]);
int leftValueIndex = m_propertySet.findPropertyIndex(shorthand.properties()[3]);
if (topValueIndex == -1 || rightValueIndex == -1 || bottomValueIndex == -1 || leftValueIndex == -1)
return String();
StylePropertySet::PropertyReference top = m_propertySet.propertyAt(topValueIndex);
StylePropertySet::PropertyReference right = m_propertySet.propertyAt(rightValueIndex);
StylePropertySet::PropertyReference bottom = m_propertySet.propertyAt(bottomValueIndex);
StylePropertySet::PropertyReference left = m_propertySet.propertyAt(leftValueIndex);
// All 4 properties must be specified.
if (!top.value() || !right.value() || !bottom.value() || !left.value())
return String();
if (top.isInherited() && right.isInherited() && bottom.isInherited() && left.isInherited())
return getValueName(CSSValueInherit);
if (top.value()->isInitialValue() || right.value()->isInitialValue() || bottom.value()->isInitialValue() || left.value()->isInitialValue()) {
if (top.value()->isInitialValue() && right.value()->isInitialValue() && bottom.value()->isInitialValue() && left.value()->isInitialValue() && !top.isImplicit()) {
// All components are "initial" and "top" is not implicit.
return getValueName(CSSValueInitial);
}
return String();
}
if (top.isImportant() != right.isImportant() || right.isImportant() != bottom.isImportant() || bottom.isImportant() != left.isImportant())
return String();
bool showLeft = !right.value()->equals(*left.value());
bool showBottom = !top.value()->equals(*bottom.value()) || showLeft;
bool showRight = !top.value()->equals(*right.value()) || showBottom;
StringBuilder result;
result.append(top.value()->cssText());
if (showRight) {
result.append(' ');
result.append(right.value()->cssText());
}
if (showBottom) {
result.append(' ');
result.append(bottom.value()->cssText());
}
if (showLeft) {
result.append(' ');
result.append(left.value()->cssText());
}
return result.toString();
}
String StylePropertySerializer::getLayeredShorthandValue(const StylePropertyShorthand& shorthand) const
{
StringBuilder result;
const unsigned size = shorthand.length();
// Begin by collecting the properties into an array.
Vector<RefPtr<CSSValue> > values(size);
size_t numLayers = 0;
for (unsigned i = 0; i < size; ++i) {
values[i] = m_propertySet.getPropertyCSSValue(shorthand.properties()[i]);
if (values[i]) {
if (values[i]->isBaseValueList()) {
CSSValueList* valueList = toCSSValueList(values[i].get());
numLayers = std::max(valueList->length(), numLayers);
} else {
numLayers = std::max<size_t>(1U, numLayers);
}
}
}
String commonValue;
bool commonValueInitialized = false;
// Now stitch the properties together. Implicit initial values are flagged as such and
// can safely be omitted.
for (size_t i = 0; i < numLayers; i++) {
StringBuilder layerResult;
bool useRepeatXShorthand = false;
bool useRepeatYShorthand = false;
bool useSingleWordShorthand = false;
bool foundPositionYCSSProperty = false;
for (unsigned j = 0; j < size; j++) {
RefPtr<CSSValue> value = nullptr;
if (values[j]) {
if (values[j]->isBaseValueList()) {
value = toCSSValueList(values[j].get())->itemWithBoundsCheck(i);
} else {
value = values[j];
// Color only belongs in the last layer.
if (shorthand.properties()[j] == CSSPropertyBackgroundColor) {
if (i != numLayers - 1)
value = nullptr;
} else if (i) {
// Other singletons only belong in the first layer.
value = nullptr;
}
}
}
// We need to report background-repeat as it was written in the CSS. If the property is implicit,
// then it was written with only one value. Here we figure out which value that was so we can
// report back correctly.
if ((shorthand.properties()[j] == CSSPropertyBackgroundRepeatX && m_propertySet.isPropertyImplicit(shorthand.properties()[j]))
|| (shorthand.properties()[j] == CSSPropertyWebkitMaskRepeatX && m_propertySet.isPropertyImplicit(shorthand.properties()[j]))) {
// BUG 49055: make sure the value was not reset in the layer check just above.
if ((j < size - 1 && shorthand.properties()[j + 1] == CSSPropertyBackgroundRepeatY && value)
|| (j < size - 1 && shorthand.properties()[j + 1] == CSSPropertyWebkitMaskRepeatY && value)) {
RefPtr<CSSValue> yValue = nullptr;
RefPtr<CSSValue> nextValue = values[j + 1];
if (nextValue->isValueList())
yValue = toCSSValueList(nextValue.get())->item(i);
else
yValue = nextValue;
// background-repeat-x(y) or mask-repeat-x(y) may be like this : "initial, repeat". We can omit the implicit initial values
// before starting to compare their values.
if (value->isImplicitInitialValue() || yValue->isImplicitInitialValue())
continue;
// FIXME: At some point we need to fix this code to avoid returning an invalid shorthand,
// since some longhand combinations are not serializable into a single shorthand.
if (!value->isPrimitiveValue() || !yValue->isPrimitiveValue())
continue;
CSSValueID xId = toCSSPrimitiveValue(value.get())->getValueID();
CSSValueID yId = toCSSPrimitiveValue(yValue.get())->getValueID();
if (xId != yId) {
if (xId == CSSValueRepeat && yId == CSSValueNoRepeat) {
useRepeatXShorthand = true;
++j;
} else if (xId == CSSValueNoRepeat && yId == CSSValueRepeat) {
useRepeatYShorthand = true;
continue;
}
} else {
useSingleWordShorthand = true;
++j;
}
}
}
String valueText;
if (value && !value->isImplicitInitialValue()) {
if (!layerResult.isEmpty())
layerResult.append(' ');
if (foundPositionYCSSProperty
&& (shorthand.properties()[j] == CSSPropertyBackgroundSize || shorthand.properties()[j] == CSSPropertyWebkitMaskSize))
layerResult.appendLiteral("/ ");
if (!foundPositionYCSSProperty
&& (shorthand.properties()[j] == CSSPropertyBackgroundSize || shorthand.properties()[j] == CSSPropertyWebkitMaskSize))
continue;
if (useRepeatXShorthand) {
useRepeatXShorthand = false;
layerResult.append(getValueName(CSSValueRepeatX));
} else if (useRepeatYShorthand) {
useRepeatYShorthand = false;
layerResult.append(getValueName(CSSValueRepeatY));
} else {
if (useSingleWordShorthand)
useSingleWordShorthand = false;
valueText = value->cssText();
layerResult.append(valueText);
}
if (shorthand.properties()[j] == CSSPropertyBackgroundPositionY
|| shorthand.properties()[j] == CSSPropertyWebkitMaskPositionY) {
foundPositionYCSSProperty = true;
// background-position is a special case: if only the first offset is specified,
// the second one defaults to "center", not the same value.
if (commonValueInitialized && commonValue != "initial" && commonValue != "inherit")
commonValue = String();
}
}
if (!commonValueInitialized) {
commonValue = valueText;
commonValueInitialized = true;
} else if (!commonValue.isNull() && commonValue != valueText)
commonValue = String();
}
if (!layerResult.isEmpty()) {
if (!result.isEmpty())
result.appendLiteral(", ");
result.append(layerResult);
}
}
if (isInitialOrInherit(commonValue))
return commonValue;
if (result.isEmpty())
return String();
return result.toString();
}
String StylePropertySerializer::getShorthandValue(const StylePropertyShorthand& shorthand) const
{
String commonValue;
StringBuilder result;
for (unsigned i = 0; i < shorthand.length(); ++i) {
if (!m_propertySet.isPropertyImplicit(shorthand.properties()[i])) {
RefPtr<CSSValue> value = m_propertySet.getPropertyCSSValue(shorthand.properties()[i]);
if (!value)
return String();
String valueText = value->cssText();
if (!i)
commonValue = valueText;
else if (!commonValue.isNull() && commonValue != valueText)
commonValue = String();
if (value->isInitialValue())
continue;
if (!result.isEmpty())
result.append(' ');
result.append(valueText);
} else
commonValue = String();
}
if (isInitialOrInherit(commonValue))
return commonValue;
if (result.isEmpty())
return String();
return result.toString();
}
// only returns a non-null value if all properties have the same, non-null value
String StylePropertySerializer::getCommonValue(const StylePropertyShorthand& shorthand) const
{
String res;
bool lastPropertyWasImportant = false;
for (unsigned i = 0; i < shorthand.length(); ++i) {
RefPtr<CSSValue> value = m_propertySet.getPropertyCSSValue(shorthand.properties()[i]);
// FIXME: CSSInitialValue::cssText should generate the right value.
if (!value)
return String();
String text = value->cssText();
if (text.isNull())
return String();
if (res.isNull())
res = text;
else if (res != text)
return String();
bool currentPropertyIsImportant = m_propertySet.propertyIsImportant(shorthand.properties()[i]);
if (i && lastPropertyWasImportant != currentPropertyIsImportant)
return String();
lastPropertyWasImportant = currentPropertyIsImportant;
}
return res;
}
String StylePropertySerializer::borderPropertyValue(CommonValueMode valueMode) const
{
const StylePropertyShorthand properties[3] = { borderWidthShorthand(), borderStyleShorthand(), borderColorShorthand() };
String commonValue;
StringBuilder result;
for (size_t i = 0; i < WTF_ARRAY_LENGTH(properties); ++i) {
String value = getCommonValue(properties[i]);
if (value.isNull()) {
if (valueMode == ReturnNullOnUncommonValues)
return String();
ASSERT(valueMode == OmitUncommonValues);
continue;
}
if (!i)
commonValue = value;
else if (!commonValue.isNull() && commonValue != value)
commonValue = String();
if (value == "initial")
continue;
if (!result.isEmpty())
result.append(' ');
result.append(value);
}
if (isInitialOrInherit(commonValue))
return commonValue;
return result.isEmpty() ? String() : result.toString();
}
static void appendBackgroundRepeatValue(StringBuilder& builder, const CSSValue& repeatXCSSValue, const CSSValue& repeatYCSSValue)
{
// FIXME: Ensure initial values do not appear in CSS_VALUE_LISTS.
DEFINE_STATIC_REF_WILL_BE_PERSISTENT(CSSPrimitiveValue, initialRepeatValue, (CSSPrimitiveValue::create(CSSValueRepeat)));
const CSSPrimitiveValue& repeatX = repeatXCSSValue.isInitialValue() ? *initialRepeatValue : toCSSPrimitiveValue(repeatXCSSValue);
const CSSPrimitiveValue& repeatY = repeatYCSSValue.isInitialValue() ? *initialRepeatValue : toCSSPrimitiveValue(repeatYCSSValue);
CSSValueID repeatXValueId = repeatX.getValueID();
CSSValueID repeatYValueId = repeatY.getValueID();
if (repeatXValueId == repeatYValueId) {
builder.append(repeatX.cssText());
} else if (repeatXValueId == CSSValueNoRepeat && repeatYValueId == CSSValueRepeat) {
builder.appendLiteral("repeat-y");
} else if (repeatXValueId == CSSValueRepeat && repeatYValueId == CSSValueNoRepeat) {
builder.appendLiteral("repeat-x");
} else {
builder.append(repeatX.cssText());
builder.appendLiteral(" ");
builder.append(repeatY.cssText());
}
}
String StylePropertySerializer::backgroundRepeatPropertyValue() const
{
RefPtr<CSSValue> repeatX = m_propertySet.getPropertyCSSValue(CSSPropertyBackgroundRepeatX);
RefPtr<CSSValue> repeatY = m_propertySet.getPropertyCSSValue(CSSPropertyBackgroundRepeatY);
if (!repeatX || !repeatY)
return String();
if (m_propertySet.propertyIsImportant(CSSPropertyBackgroundRepeatX) != m_propertySet.propertyIsImportant(CSSPropertyBackgroundRepeatY))
return String();
if (repeatX->cssValueType() == repeatY->cssValueType()
&& (repeatX->cssValueType() == CSSValue::CSS_INITIAL || repeatX->cssValueType() == CSSValue::CSS_INHERIT)) {
return repeatX->cssText();
}
RefPtr<CSSValueList> repeatXList;
if (repeatX->cssValueType() == CSSValue::CSS_PRIMITIVE_VALUE) {
repeatXList = CSSValueList::createCommaSeparated();
repeatXList->append(repeatX);
} else if (repeatX->cssValueType() == CSSValue::CSS_VALUE_LIST) {
repeatXList = toCSSValueList(repeatX.get());
} else {
return String();
}
RefPtr<CSSValueList> repeatYList;
if (repeatY->cssValueType() == CSSValue::CSS_PRIMITIVE_VALUE) {
repeatYList = CSSValueList::createCommaSeparated();
repeatYList->append(repeatY);
} else if (repeatY->cssValueType() == CSSValue::CSS_VALUE_LIST) {
repeatYList = toCSSValueList(repeatY.get());
} else {
return String();
}
size_t shorthandLength = lowestCommonMultiple(repeatXList->length(), repeatYList->length());
StringBuilder builder;
for (size_t i = 0; i < shorthandLength; ++i) {
if (i)
builder.appendLiteral(", ");
appendBackgroundRepeatValue(builder,
*repeatXList->item(i % repeatXList->length()),
*repeatYList->item(i % repeatYList->length()));
}
return builder.toString();
}
void StylePropertySerializer::appendBackgroundPropertyAsText(StringBuilder& result, unsigned& numDecls) const
{
if (isPropertyShorthandAvailable(backgroundShorthand())) {
String backgroundValue = getPropertyValue(CSSPropertyBackground);
bool isImportant = m_propertySet.propertyIsImportant(CSSPropertyBackgroundImage);
result.append(getPropertyText(CSSPropertyBackground, backgroundValue, isImportant, numDecls++));
return;
}
if (shorthandHasOnlyInitialOrInheritedValue(backgroundShorthand())) {
RefPtr<CSSValue> value = m_propertySet.getPropertyCSSValue(CSSPropertyBackgroundImage);
bool isImportant = m_propertySet.propertyIsImportant(CSSPropertyBackgroundImage);
result.append(getPropertyText(CSSPropertyBackground, value->cssText(), isImportant, numDecls++));
return;
}
// backgroundShorthandProperty without layered shorhand properties
const CSSPropertyID backgroundPropertyIds[] = {
CSSPropertyBackgroundImage,
CSSPropertyBackgroundAttachment,
CSSPropertyBackgroundColor,
CSSPropertyBackgroundSize,
CSSPropertyBackgroundOrigin,
CSSPropertyBackgroundClip
};
for (unsigned i = 0; i < WTF_ARRAY_LENGTH(backgroundPropertyIds); ++i) {
CSSPropertyID propertyID = backgroundPropertyIds[i];
RefPtr<CSSValue> value = m_propertySet.getPropertyCSSValue(propertyID);
if (!value)
continue;
result.append(getPropertyText(propertyID, value->cssText(), m_propertySet.propertyIsImportant(propertyID), numDecls++));
}
// FIXME: This is a not-so-nice way to turn x/y positions into single background-position in output.
// It is required because background-position-x/y are non-standard properties and WebKit generated output
// would not work in Firefox (<rdar://problem/5143183>)
// It would be a better solution if background-position was CSS_PAIR.
if (shorthandHasOnlyInitialOrInheritedValue(backgroundPositionShorthand())) {
RefPtr<CSSValue> value = m_propertySet.getPropertyCSSValue(CSSPropertyBackgroundPositionX);
bool isImportant = m_propertySet.propertyIsImportant(CSSPropertyBackgroundPositionX);
result.append(getPropertyText(CSSPropertyBackgroundPosition, value->cssText(), isImportant, numDecls++));
} else if (isPropertyShorthandAvailable(backgroundPositionShorthand())) {
String positionValue = m_propertySet.getPropertyValue(CSSPropertyBackgroundPosition);
bool isImportant = m_propertySet.propertyIsImportant(CSSPropertyBackgroundPositionX);
if (!positionValue.isNull())
result.append(getPropertyText(CSSPropertyBackgroundPosition, positionValue, isImportant, numDecls++));
} else {
// should check background-position-x or background-position-y.
if (RefPtr<CSSValue> value = m_propertySet.getPropertyCSSValue(CSSPropertyBackgroundPositionX)) {
if (!value->isImplicitInitialValue()) {
bool isImportant = m_propertySet.propertyIsImportant(CSSPropertyBackgroundPositionX);
result.append(getPropertyText(CSSPropertyBackgroundPositionX, value->cssText(), isImportant, numDecls++));
}
}
if (RefPtr<CSSValue> value = m_propertySet.getPropertyCSSValue(CSSPropertyBackgroundPositionY)) {
if (!value->isImplicitInitialValue()) {
bool isImportant = m_propertySet.propertyIsImportant(CSSPropertyBackgroundPositionY);
result.append(getPropertyText(CSSPropertyBackgroundPositionY, value->cssText(), isImportant, numDecls++));
}
}
}
String repeatValue = m_propertySet.getPropertyValue(CSSPropertyBackgroundRepeat);
if (!repeatValue.isNull())
result.append(getPropertyText(CSSPropertyBackgroundRepeat, repeatValue, m_propertySet.propertyIsImportant(CSSPropertyBackgroundRepeatX), numDecls++));
}
bool StylePropertySerializer::isPropertyShorthandAvailable(const StylePropertyShorthand& shorthand) const
{
ASSERT(shorthand.length() > 0);
bool isImportant = m_propertySet.propertyIsImportant(shorthand.properties()[0]);
for (unsigned i = 0; i < shorthand.length(); ++i) {
RefPtr<CSSValue> value = m_propertySet.getPropertyCSSValue(shorthand.properties()[i]);
if (!value || (value->isInitialValue() && !value->isImplicitInitialValue()) || value->isInheritedValue())
return false;
if (isImportant != m_propertySet.propertyIsImportant(shorthand.properties()[i]))
return false;
}
return true;
}
bool StylePropertySerializer::shorthandHasOnlyInitialOrInheritedValue(const StylePropertyShorthand& shorthand) const
{
ASSERT(shorthand.length() > 0);
bool isImportant = m_propertySet.propertyIsImportant(shorthand.properties()[0]);
bool isInitialValue = true;
bool isInheritedValue = true;
for (unsigned i = 0; i < shorthand.length(); ++i) {
RefPtr<CSSValue> value = m_propertySet.getPropertyCSSValue(shorthand.properties()[i]);
if (!value)
return false;
if (!value->isInitialValue())
isInitialValue = false;
if (!value->isInheritedValue())
isInheritedValue = false;
if (isImportant != m_propertySet.propertyIsImportant(shorthand.properties()[i]))
return false;
}
return isInitialValue || isInheritedValue;
}
}
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