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Declaration.cpp
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* representation of a declaration block (or style attribute) in a CSS
* stylesheet
*/
#include "mozilla/css/Declaration.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/ServoStyleSet.h"
#include "mozilla/css/Rule.h"
#include "nsPrintfCString.h"
#include "gfxFontConstants.h"
#include "nsStyleUtil.h"
namespace mozilla {
namespace css {
NS_IMPL_QUERY_INTERFACE(ImportantStyleData, nsIStyleRule)
NS_IMPL_ADDREF_USING_AGGREGATOR(ImportantStyleData, Declaration())
NS_IMPL_RELEASE_USING_AGGREGATOR(ImportantStyleData, Declaration())
/* virtual */ void
ImportantStyleData::MapRuleInfoInto(nsRuleData* aRuleData)
{
Declaration()->MapImportantRuleInfoInto(aRuleData);
}
/* virtual */ bool
ImportantStyleData::MightMapInheritedStyleData()
{
return Declaration()->MapsImportantInheritedStyleData();
}
/* virtual */ bool
ImportantStyleData::GetDiscretelyAnimatedCSSValue(nsCSSPropertyID aProperty,
nsCSSValue* aValue)
{
return Declaration()->GetDiscretelyAnimatedCSSValue(aProperty, aValue);
}
#ifdef DEBUG
/* virtual */ void
ImportantStyleData::List(FILE* out, int32_t aIndent) const
{
// Indent
nsAutoCString str;
for (int32_t index = aIndent; --index >= 0; ) {
str.AppendLiteral(" ");
}
str.AppendLiteral("! important rule\n");
fprintf_stderr(out, "%s", str.get());
}
#endif
Declaration::Declaration(const Declaration& aCopy)
: DeclarationBlock(aCopy),
mOrder(aCopy.mOrder),
mVariableOrder(aCopy.mVariableOrder),
mData(aCopy.mData ? aCopy.mData->Clone() : nullptr),
mImportantData(aCopy.mImportantData ?
aCopy.mImportantData->Clone() : nullptr),
mVariables(aCopy.mVariables ?
new CSSVariableDeclarations(*aCopy.mVariables) :
nullptr),
mImportantVariables(aCopy.mImportantVariables ?
new CSSVariableDeclarations(*aCopy.mImportantVariables) :
nullptr)
{
}
Declaration::~Declaration()
{
}
NS_INTERFACE_MAP_BEGIN(Declaration)
if (aIID.Equals(NS_GET_IID(mozilla::css::Declaration))) {
*aInstancePtr = this;
NS_ADDREF_THIS();
return NS_OK;
}
else
NS_INTERFACE_MAP_ENTRY(nsIStyleRule)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIStyleRule)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(Declaration)
NS_IMPL_RELEASE(Declaration)
/* virtual */ void
Declaration::MapRuleInfoInto(nsRuleData* aRuleData)
{
MOZ_ASSERT(mData, "must call only while compressed");
mData->MapRuleInfoInto(aRuleData);
if (mVariables) {
mVariables->MapRuleInfoInto(aRuleData);
}
}
/* virtual */ bool
Declaration::MightMapInheritedStyleData()
{
MOZ_ASSERT(mData, "must call only while compressed");
if (mVariables && mVariables->Count() != 0) {
return true;
}
return mData->HasInheritedStyleData();
}
/* virtual */ bool
Declaration::GetDiscretelyAnimatedCSSValue(nsCSSPropertyID aProperty,
nsCSSValue* aValue)
{
nsCSSCompressedDataBlock* data = GetPropertyIsImportantByID(aProperty)
? mImportantData : mData;
const nsCSSValue* value = data->ValueFor(aProperty);
if (!value) {
return false;
}
*aValue = *value;
return true;
}
bool
Declaration::MapsImportantInheritedStyleData() const
{
MOZ_ASSERT(mData, "must call only while compressed");
MOZ_ASSERT(HasImportantData(), "must only be called for Declarations with "
"important data");
if (mImportantVariables && mImportantVariables->Count() != 0) {
return true;
}
return mImportantData ? mImportantData->HasInheritedStyleData() : false;
}
void
Declaration::ValueAppended(nsCSSPropertyID aProperty)
{
MOZ_ASSERT(!mData && !mImportantData,
"should only be called while expanded");
MOZ_ASSERT(!nsCSSProps::IsShorthand(aProperty),
"shorthands forbidden");
// order IS important for CSS, so remove and add to the end
mOrder.RemoveElement(static_cast<uint32_t>(aProperty));
mOrder.AppendElement(static_cast<uint32_t>(aProperty));
}
template<typename PropFunc, typename CustomPropFunc>
inline void
DispatchPropertyOperation(const nsAString& aProperty,
PropFunc aPropFunc, CustomPropFunc aCustomPropFunc)
{
nsCSSPropertyID propID =
nsCSSProps::LookupProperty(aProperty, CSSEnabledState::eForAllContent);
if (propID != eCSSProperty_UNKNOWN) {
if (propID != eCSSPropertyExtra_variable) {
aPropFunc(propID);
} else {
aCustomPropFunc(Substring(aProperty, CSS_CUSTOM_NAME_PREFIX_LENGTH));
}
}
}
void
Declaration::GetPropertyValue(const nsAString& aProperty,
nsAString& aValue) const
{
DispatchPropertyOperation(aProperty,
[&](nsCSSPropertyID propID) { GetPropertyValueByID(propID, aValue); },
[&](const nsAString& name) { GetVariableValue(name, aValue); });
}
void
Declaration::GetPropertyValueByID(nsCSSPropertyID aPropID,
nsAString& aValue) const
{
GetPropertyValueInternal(aPropID, aValue, nsCSSValue::eNormalized);
}
void
Declaration::GetAuthoredPropertyValue(const nsAString& aProperty,
nsAString& aValue) const
{
DispatchPropertyOperation(aProperty,
[&](nsCSSPropertyID propID) {
GetPropertyValueInternal(propID, aValue, nsCSSValue::eAuthorSpecified);
},
[&](const nsAString& name) { GetVariableValue(name, aValue); });
}
bool
Declaration::GetPropertyIsImportant(const nsAString& aProperty) const
{
bool r = false;
DispatchPropertyOperation(aProperty,
[&](nsCSSPropertyID propID) { r = GetPropertyIsImportantByID(propID); },
[&](const nsAString& name) { r = GetVariableIsImportant(name); });
return r;
}
void
Declaration::RemoveProperty(const nsAString& aProperty)
{
DispatchPropertyOperation(aProperty,
[&](nsCSSPropertyID propID) { RemovePropertyByID(propID); },
[&](const nsAString& name) { RemoveVariable(name); });
}
void
Declaration::RemovePropertyByID(nsCSSPropertyID aProperty)
{
MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT);
nsCSSExpandedDataBlock data;
ExpandTo(&data);
MOZ_ASSERT(!mData && !mImportantData, "Expand didn't null things out");
if (nsCSSProps::IsShorthand(aProperty)) {
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aProperty,
CSSEnabledState::eForAllContent) {
data.ClearLonghandProperty(*p);
mOrder.RemoveElement(static_cast<uint32_t>(*p));
}
} else {
data.ClearLonghandProperty(aProperty);
mOrder.RemoveElement(static_cast<uint32_t>(aProperty));
}
CompressFrom(&data);
}
bool
Declaration::HasProperty(nsCSSPropertyID aProperty) const
{
MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT_no_shorthands,
"property ID out of range");
nsCSSCompressedDataBlock *data = GetPropertyIsImportantByID(aProperty)
? mImportantData : mData;
const nsCSSValue *val = data->ValueFor(aProperty);
return !!val;
}
bool
Declaration::AppendValueToString(nsCSSPropertyID aProperty,
nsAString& aResult,
nsCSSValue::Serialization aSerialization,
bool* aIsTokenStream) const
{
MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT_no_shorthands,
"property ID out of range");
nsCSSCompressedDataBlock *data = GetPropertyIsImportantByID(aProperty)
? mImportantData : mData;
const nsCSSValue *val = data->ValueFor(aProperty);
if (!val) {
return false;
}
if (aIsTokenStream) {
*aIsTokenStream = val->GetUnit() == eCSSUnit_TokenStream;
}
val->AppendToString(aProperty, aResult, aSerialization);
return true;
}
static void
AppendSingleImageLayerPositionValue(const nsCSSValue& aPositionX,
const nsCSSValue& aPositionY,
const nsCSSPropertyID aTable[],
nsAString& aValue,
nsCSSValue::Serialization aSerialization)
{
// We need to make sure that we don't serialize to an invalid 3-value form.
// The 3-value form is only valid if both edges are present.
const nsCSSValue &xEdge = aPositionX.GetArrayValue()->Item(0);
const nsCSSValue &xOffset = aPositionX.GetArrayValue()->Item(1);
const nsCSSValue &yEdge = aPositionY.GetArrayValue()->Item(0);
const nsCSSValue &yOffset = aPositionY.GetArrayValue()->Item(1);
bool xHasEdge = (eCSSUnit_Enumerated == xEdge.GetUnit());
bool xHasBoth = xHasEdge && (eCSSUnit_Null != xOffset.GetUnit());
bool yHasEdge = (eCSSUnit_Enumerated == yEdge.GetUnit());
bool yHasBoth = yHasEdge && (eCSSUnit_Null != yOffset.GetUnit());
if (yHasBoth && !xHasEdge) {
// Output 4-value form by adding the x edge.
aValue.AppendLiteral("left ");
}
aPositionX.AppendToString(aTable[nsStyleImageLayers::positionX],
aValue, aSerialization);
aValue.Append(char16_t(' '));
if (xHasBoth && !yHasEdge) {
// Output 4-value form by adding the y edge.
aValue.AppendLiteral("top ");
}
aPositionY.AppendToString(aTable[nsStyleImageLayers::positionY],
aValue, aSerialization);
}
void
Declaration::GetImageLayerValue(
nsCSSCompressedDataBlock *data,
nsAString& aValue,
nsCSSValue::Serialization aSerialization,
const nsCSSPropertyID aTable[]) const
{
// We know from our caller that all subproperties were specified.
// However, we still can't represent that in the shorthand unless
// they're all lists of the same length. So if they're different
// lengths, we need to bail out.
// We also need to bail out if an item has background-clip and
// background-origin that are different and not the default
// values. (We omit them if they're both default.)
// Common CSS properties for both background & mask layer.
const nsCSSValueList *image =
data->ValueFor(aTable[nsStyleImageLayers::image])->GetListValue();
const nsCSSValuePairList *repeat =
data->ValueFor(aTable[nsStyleImageLayers::repeat])->GetPairListValue();
const nsCSSValueList *positionX =
data->ValueFor(aTable[nsStyleImageLayers::positionX])->GetListValue();
const nsCSSValueList *positionY =
data->ValueFor(aTable[nsStyleImageLayers::positionY])->GetListValue();
const nsCSSValueList *clip =
data->ValueFor(aTable[nsStyleImageLayers::clip])->GetListValue();
const nsCSSValueList *origin =
data->ValueFor(aTable[nsStyleImageLayers::origin])->GetListValue();
const nsCSSValuePairList *size =
data->ValueFor(aTable[nsStyleImageLayers::size])->GetPairListValue();
// Background layer property.
const nsCSSValueList *attachment =
(aTable[nsStyleImageLayers::attachment] == eCSSProperty_UNKNOWN)?
nullptr :
data->ValueFor(aTable[nsStyleImageLayers::attachment])->GetListValue();
// Mask layer properties.
const nsCSSValueList *composite =
(aTable[nsStyleImageLayers::composite] == eCSSProperty_UNKNOWN)?
nullptr :
data->ValueFor(aTable[nsStyleImageLayers::composite])->GetListValue();
const nsCSSValueList *mode =
(aTable[nsStyleImageLayers::maskMode] == eCSSProperty_UNKNOWN)?
nullptr :
data->ValueFor(aTable[nsStyleImageLayers::maskMode])->GetListValue();
for (;;) {
// Serialize background-color at the beginning of the last item.
if (!image->mNext) {
if (aTable[nsStyleImageLayers::color] != eCSSProperty_UNKNOWN) {
AppendValueToString(aTable[nsStyleImageLayers::color], aValue,
aSerialization);
aValue.Append(char16_t(' '));
}
}
image->mValue.AppendToString(aTable[nsStyleImageLayers::image], aValue,
aSerialization);
aValue.Append(char16_t(' '));
repeat->mXValue.AppendToString(aTable[nsStyleImageLayers::repeat], aValue,
aSerialization);
if (repeat->mYValue.GetUnit() != eCSSUnit_Null) {
repeat->mYValue.AppendToString(aTable[nsStyleImageLayers::repeat], aValue,
aSerialization);
}
if (attachment) {
aValue.Append(char16_t(' '));
attachment->mValue.AppendToString(aTable[nsStyleImageLayers::attachment],
aValue, aSerialization);
}
aValue.Append(char16_t(' '));
AppendSingleImageLayerPositionValue(positionX->mValue, positionY->mValue,
aTable, aValue, aSerialization);
if (size->mXValue.GetUnit() != eCSSUnit_Auto ||
size->mYValue.GetUnit() != eCSSUnit_Auto) {
aValue.Append(char16_t(' '));
aValue.Append(char16_t('/'));
aValue.Append(char16_t(' '));
size->mXValue.AppendToString(aTable[nsStyleImageLayers::size], aValue,
aSerialization);
aValue.Append(char16_t(' '));
size->mYValue.AppendToString(aTable[nsStyleImageLayers::size], aValue,
aSerialization);
}
MOZ_ASSERT(clip->mValue.GetUnit() == eCSSUnit_Enumerated &&
origin->mValue.GetUnit() == eCSSUnit_Enumerated,
"should not have inherit/initial within list");
StyleGeometryBox originDefaultValue =
(aTable == nsStyleImageLayers::kBackgroundLayerTable)
? StyleGeometryBox::PaddingBox : StyleGeometryBox::BorderBox;
if (static_cast<StyleGeometryBox>(clip->mValue.GetIntValue()) !=
StyleGeometryBox::BorderBox ||
static_cast<StyleGeometryBox>(origin->mValue.GetIntValue()) !=
originDefaultValue) {
#ifdef DEBUG
const nsCSSProps::KTableEntry* originTable = nsCSSProps::kKeywordTableTable[aTable[nsStyleImageLayers::origin]];
const nsCSSProps::KTableEntry* clipTable = nsCSSProps::kKeywordTableTable[aTable[nsStyleImageLayers::clip]];
for (size_t i = 0; originTable[i].mValue != -1; i++) {
// For each keyword & value in kOriginKTable, ensure that
// kBackgroundKTable has a matching entry at the same position.
MOZ_ASSERT(originTable[i].mKeyword == clipTable[i].mKeyword);
MOZ_ASSERT(originTable[i].mValue == clipTable[i].mValue);
}
#endif
aValue.Append(char16_t(' '));
origin->mValue.AppendToString(aTable[nsStyleImageLayers::origin], aValue,
aSerialization);
if (clip->mValue != origin->mValue) {
aValue.Append(char16_t(' '));
clip->mValue.AppendToString(aTable[nsStyleImageLayers::clip], aValue,
aSerialization);
}
}
if (composite) {
aValue.Append(char16_t(' '));
composite->mValue.AppendToString(aTable[nsStyleImageLayers::composite],
aValue, aSerialization);
}
if (mode) {
aValue.Append(char16_t(' '));
mode->mValue.AppendToString(aTable[nsStyleImageLayers::maskMode],
aValue, aSerialization);
}
image = image->mNext;
repeat = repeat->mNext;
positionX = positionX->mNext;
positionY = positionY->mNext;
clip = clip->mNext;
origin = origin->mNext;
size = size->mNext;
attachment = attachment ? attachment->mNext : nullptr;
composite = composite ? composite->mNext : nullptr;
mode = mode ? mode->mNext : nullptr;
if (!image) {
// This layer is an background layer
if (aTable == nsStyleImageLayers::kBackgroundLayerTable) {
if (repeat || positionX || positionY || clip || origin || size ||
attachment) {
// Uneven length lists, so can't be serialized as shorthand.
aValue.Truncate();
return;
}
// This layer is an mask layer
} else {
#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
MOZ_ASSERT(aTable == nsStyleImageLayers::kMaskLayerTable);
#else
MOZ_ASSERT_UNREACHABLE("Should never get here when mask-as-shorthand is disable");
#endif
if (repeat || positionX || positionY || clip || origin || size ||
composite || mode) {
// Uneven length lists, so can't be serialized as shorthand.
aValue.Truncate();
return;
}
}
break;
}
// This layer is an background layer
if (aTable == nsStyleImageLayers::kBackgroundLayerTable) {
if (!repeat || !positionX || !positionY || !clip || !origin || !size ||
!attachment) {
// Uneven length lists, so can't be serialized as shorthand.
aValue.Truncate();
return;
}
// This layer is an mask layer
} else {
#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
MOZ_ASSERT(aTable == nsStyleImageLayers::kMaskLayerTable);
#else
MOZ_ASSERT_UNREACHABLE("Should never get here when mask-as-shorthand is disable");
#endif
if (!repeat || !positionX || !positionY || !clip || !origin || !size ||
!composite || !mode) {
// Uneven length lists, so can't be serialized as shorthand.
aValue.Truncate();
return;
}
}
aValue.Append(char16_t(','));
aValue.Append(char16_t(' '));
}
}
void
Declaration::GetImageLayerPositionValue(
nsCSSCompressedDataBlock *data,
nsAString& aValue,
nsCSSValue::Serialization aSerialization,
const nsCSSPropertyID aTable[]) const
{
// We know from above that all subproperties were specified.
// However, we still can't represent that in the shorthand unless
// they're all lists of the same length. So if they're different
// lengths, we need to bail out.
const nsCSSValueList *positionX =
data->ValueFor(aTable[nsStyleImageLayers::positionX])->GetListValue();
const nsCSSValueList *positionY =
data->ValueFor(aTable[nsStyleImageLayers::positionY])->GetListValue();
for (;;) {
AppendSingleImageLayerPositionValue(positionX->mValue, positionY->mValue,
aTable, aValue, aSerialization);
positionX = positionX->mNext;
positionY = positionY->mNext;
if (!positionX || !positionY) {
if (positionX || positionY) {
// Uneven length lists, so can't be serialized as shorthand.
aValue.Truncate();
}
return;
}
aValue.Append(char16_t(','));
aValue.Append(char16_t(' '));
}
}
void
Declaration::GetPropertyValueInternal(
nsCSSPropertyID aProperty, nsAString& aValue,
nsCSSValue::Serialization aSerialization, bool* aIsTokenStream) const
{
aValue.Truncate(0);
if (aIsTokenStream) {
*aIsTokenStream = false;
}
// simple properties are easy.
if (!nsCSSProps::IsShorthand(aProperty)) {
AppendValueToString(aProperty, aValue, aSerialization, aIsTokenStream);
return;
}
// DOM Level 2 Style says (when describing CSS2Properties, although
// not CSSStyleDeclaration.getPropertyValue):
// However, if there is no shorthand declaration that could be added
// to the ruleset without changing in any way the rules already
// declared in the ruleset (i.e., by adding longhand rules that were
// previously not declared in the ruleset), then the empty string
// should be returned for the shorthand property.
// This means we need to check a number of cases:
// (1) Since a shorthand sets all sub-properties, if some of its
// subproperties were not specified, we must return the empty
// string.
// (2) Since 'inherit', 'initial' and 'unset' can only be specified
// as the values for entire properties, we need to return the
// empty string if some but not all of the subproperties have one
// of those values.
// (3) Since a single value only makes sense with or without
// !important, we return the empty string if some values are
// !important and some are not.
// Since we're doing this check for 'inherit' and 'initial' up front,
// we can also simplify the property serialization code by serializing
// those values up front as well.
//
// Additionally, if a shorthand property was set using a value with a
// variable reference and none of its component longhand properties were
// then overridden on the declaration, we return the token stream
// assigned to the shorthand.
const nsCSSValue* tokenStream = nullptr;
uint32_t totalCount = 0, importantCount = 0,
initialCount = 0, inheritCount = 0, unsetCount = 0,
matchingTokenStreamCount = 0, nonMatchingTokenStreamCount = 0;
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aProperty,
CSSEnabledState::eForAllContent) {
if (*p == eCSSProperty__x_system_font) {
// The system-font subproperty doesn't count.
continue;
}
++totalCount;
const nsCSSValue *val = mData->ValueFor(*p);
MOZ_ASSERT(!val || !mImportantData || !mImportantData->ValueFor(*p),
"can't be in both blocks");
if (!val && mImportantData) {
++importantCount;
val = mImportantData->ValueFor(*p);
}
if (!val) {
// Case (1) above: some subproperties not specified.
return;
}
if (val->GetUnit() == eCSSUnit_Inherit) {
++inheritCount;
} else if (val->GetUnit() == eCSSUnit_Initial) {
++initialCount;
} else if (val->GetUnit() == eCSSUnit_Unset) {
++unsetCount;
} else if (val->GetUnit() == eCSSUnit_TokenStream) {
if (val->GetTokenStreamValue()->mShorthandPropertyID == aProperty) {
tokenStream = val;
++matchingTokenStreamCount;
} else {
++nonMatchingTokenStreamCount;
}
}
}
if (importantCount != 0 && importantCount != totalCount) {
// Case (3), no consistent importance.
return;
}
if (initialCount == totalCount) {
// Simplify serialization below by serializing initial up-front.
nsCSSValue(eCSSUnit_Initial).AppendToString(eCSSProperty_UNKNOWN, aValue,
nsCSSValue::eNormalized);
return;
}
if (inheritCount == totalCount) {
// Simplify serialization below by serializing inherit up-front.
nsCSSValue(eCSSUnit_Inherit).AppendToString(eCSSProperty_UNKNOWN, aValue,
nsCSSValue::eNormalized);
return;
}
if (unsetCount == totalCount) {
// Simplify serialization below by serializing unset up-front.
nsCSSValue(eCSSUnit_Unset).AppendToString(eCSSProperty_UNKNOWN, aValue,
nsCSSValue::eNormalized);
return;
}
if (initialCount != 0 || inheritCount != 0 ||
unsetCount != 0 || nonMatchingTokenStreamCount != 0) {
// Case (2): partially initial, inherit, unset or token stream.
return;
}
if (tokenStream) {
if (matchingTokenStreamCount == totalCount) {
// Shorthand was specified using variable references and all of its
// longhand components were set by the shorthand.
if (aIsTokenStream) {
*aIsTokenStream = true;
}
aValue.Append(tokenStream->GetTokenStreamValue()->mTokenStream);
} else {
// In all other cases, serialize to the empty string.
}
return;
}
nsCSSCompressedDataBlock *data = importantCount ? mImportantData : mData;
switch (aProperty) {
case eCSSProperty_margin:
case eCSSProperty_padding:
case eCSSProperty_border_color:
case eCSSProperty_border_style:
case eCSSProperty_border_width: {
const nsCSSPropertyID* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
MOZ_ASSERT(nsCSSProps::GetStringValue(subprops[0]).Find("-top") !=
kNotFound, "first subprop must be top");
MOZ_ASSERT(nsCSSProps::GetStringValue(subprops[1]).Find("-right") !=
kNotFound, "second subprop must be right");
MOZ_ASSERT(nsCSSProps::GetStringValue(subprops[2]).Find("-bottom") !=
kNotFound, "third subprop must be bottom");
MOZ_ASSERT(nsCSSProps::GetStringValue(subprops[3]).Find("-left") !=
kNotFound, "fourth subprop must be left");
const nsCSSValue* vals[4] = {
data->ValueFor(subprops[0]),
data->ValueFor(subprops[1]),
data->ValueFor(subprops[2]),
data->ValueFor(subprops[3])
};
nsCSSValue::AppendSidesShorthandToString(subprops, vals, aValue,
aSerialization);
break;
}
case eCSSProperty_border_radius:
case eCSSProperty__moz_outline_radius: {
const nsCSSPropertyID* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
const nsCSSValue* vals[4] = {
data->ValueFor(subprops[0]),
data->ValueFor(subprops[1]),
data->ValueFor(subprops[2]),
data->ValueFor(subprops[3])
};
nsCSSValue::AppendBasicShapeRadiusToString(subprops, vals, aValue,
aSerialization);
break;
}
case eCSSProperty_border_image: {
// Even though there are some cases where we could omit
// 'border-image-source' (when it's none), it's probably not a
// good idea since it's likely to be confusing. It would also
// require adding the extra check that we serialize *something*.
AppendValueToString(eCSSProperty_border_image_source, aValue,
aSerialization);
bool sliceDefault = data->HasDefaultBorderImageSlice();
bool widthDefault = data->HasDefaultBorderImageWidth();
bool outsetDefault = data->HasDefaultBorderImageOutset();
if (!sliceDefault || !widthDefault || !outsetDefault) {
aValue.Append(char16_t(' '));
AppendValueToString(eCSSProperty_border_image_slice, aValue,
aSerialization);
if (!widthDefault || !outsetDefault) {
aValue.AppendLiteral(" /");
if (!widthDefault) {
aValue.Append(char16_t(' '));
AppendValueToString(eCSSProperty_border_image_width, aValue,
aSerialization);
}
if (!outsetDefault) {
aValue.AppendLiteral(" / ");
AppendValueToString(eCSSProperty_border_image_outset, aValue,
aSerialization);
}
}
}
bool repeatDefault = data->HasDefaultBorderImageRepeat();
if (!repeatDefault) {
aValue.Append(char16_t(' '));
AppendValueToString(eCSSProperty_border_image_repeat, aValue,
aSerialization);
}
break;
}
case eCSSProperty_border: {
// If we have a non-default value for any of the properties that
// this shorthand sets but cannot specify, we have to return the
// empty string.
if (data->ValueFor(eCSSProperty_border_image_source)->GetUnit() !=
eCSSUnit_None ||
!data->HasDefaultBorderImageSlice() ||
!data->HasDefaultBorderImageWidth() ||
!data->HasDefaultBorderImageOutset() ||
!data->HasDefaultBorderImageRepeat() ||
data->ValueFor(eCSSProperty__moz_border_top_colors)->GetUnit() !=
eCSSUnit_None ||
data->ValueFor(eCSSProperty__moz_border_right_colors)->GetUnit() !=
eCSSUnit_None ||
data->ValueFor(eCSSProperty__moz_border_bottom_colors)->GetUnit() !=
eCSSUnit_None ||
data->ValueFor(eCSSProperty__moz_border_left_colors)->GetUnit() !=
eCSSUnit_None) {
break;
}
const nsCSSPropertyID* subproptables[3] = {
nsCSSProps::SubpropertyEntryFor(eCSSProperty_border_color),
nsCSSProps::SubpropertyEntryFor(eCSSProperty_border_style),
nsCSSProps::SubpropertyEntryFor(eCSSProperty_border_width)
};
bool match = true;
for (const nsCSSPropertyID** subprops = subproptables,
**subprops_end = ArrayEnd(subproptables);
subprops < subprops_end; ++subprops) {
const nsCSSValue *firstSide = data->ValueFor((*subprops)[0]);
for (int32_t side = 1; side < 4; ++side) {
const nsCSSValue *otherSide =
data->ValueFor((*subprops)[side]);
if (*firstSide != *otherSide)
match = false;
}
}
if (!match) {
// We can't express what we have in the border shorthand
break;
}
// tweak aProperty and fall through
aProperty = eCSSProperty_border_top;
MOZ_FALLTHROUGH;
}
case eCSSProperty_border_top:
case eCSSProperty_border_right:
case eCSSProperty_border_bottom:
case eCSSProperty_border_left:
case eCSSProperty_border_inline_start:
case eCSSProperty_border_inline_end:
case eCSSProperty_border_block_start:
case eCSSProperty_border_block_end:
case eCSSProperty_column_rule:
case eCSSProperty_outline: {
const nsCSSPropertyID* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
MOZ_ASSERT(StringEndsWith(nsCSSProps::GetStringValue(subprops[2]),
NS_LITERAL_CSTRING("-color")),
"third subprop must be the color property");
const nsCSSValue *colorValue = data->ValueFor(subprops[2]);
bool isCurrentColor =
colorValue->GetUnit() == eCSSUnit_EnumColor &&
colorValue->GetIntValue() == NS_COLOR_CURRENTCOLOR;
if (!AppendValueToString(subprops[0], aValue, aSerialization) ||
!(aValue.Append(char16_t(' ')),
AppendValueToString(subprops[1], aValue, aSerialization)) ||
// Don't output a third value when it's currentcolor.
!(isCurrentColor ||
(aValue.Append(char16_t(' ')),
AppendValueToString(subprops[2], aValue, aSerialization)))) {
aValue.Truncate();
}
break;
}
case eCSSProperty_background: {
GetImageLayerValue(data, aValue, aSerialization,
nsStyleImageLayers::kBackgroundLayerTable);
break;
}
case eCSSProperty_background_position: {
GetImageLayerPositionValue(data, aValue, aSerialization,
nsStyleImageLayers::kBackgroundLayerTable);
break;
}
#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
case eCSSProperty_mask: {
GetImageLayerValue(data, aValue, aSerialization,
nsStyleImageLayers::kMaskLayerTable);
break;
}
case eCSSProperty_mask_position: {
GetImageLayerPositionValue(data, aValue, aSerialization,
nsStyleImageLayers::kMaskLayerTable);
break;
}
#endif
case eCSSProperty_font: {
// systemFont might not be present; other values are guaranteed to be
// available based on the shorthand check at the beginning of the
// function, as long as the prop is enabled
const nsCSSValue *systemFont =
data->ValueFor(eCSSProperty__x_system_font);
const nsCSSValue *style =
data->ValueFor(eCSSProperty_font_style);
const nsCSSValue *weight =
data->ValueFor(eCSSProperty_font_weight);
const nsCSSValue *size =
data->ValueFor(eCSSProperty_font_size);
const nsCSSValue *lh =
data->ValueFor(eCSSProperty_line_height);
const nsCSSValue *family =
data->ValueFor(eCSSProperty_font_family);
const nsCSSValue *stretch =
data->ValueFor(eCSSProperty_font_stretch);
const nsCSSValue *sizeAdjust =
data->ValueFor(eCSSProperty_font_size_adjust);
const nsCSSValue *featureSettings =
data->ValueFor(eCSSProperty_font_feature_settings);
const nsCSSValue *languageOverride =
data->ValueFor(eCSSProperty_font_language_override);
const nsCSSValue *fontKerning =
data->ValueFor(eCSSProperty_font_kerning);
const nsCSSValue *fontVariantAlternates =
data->ValueFor(eCSSProperty_font_variant_alternates);
const nsCSSValue *fontVariantCaps =
data->ValueFor(eCSSProperty_font_variant_caps);
const nsCSSValue *fontVariantEastAsian =
data->ValueFor(eCSSProperty_font_variant_east_asian);
const nsCSSValue *fontVariantLigatures =
data->ValueFor(eCSSProperty_font_variant_ligatures);
const nsCSSValue *fontVariantNumeric =
data->ValueFor(eCSSProperty_font_variant_numeric);
const nsCSSValue *fontVariantPosition =
data->ValueFor(eCSSProperty_font_variant_position);
if (systemFont &&
systemFont->GetUnit() != eCSSUnit_None &&
systemFont->GetUnit() != eCSSUnit_Null) {
if (style->GetUnit() != eCSSUnit_System_Font ||
weight->GetUnit() != eCSSUnit_System_Font ||
size->GetUnit() != eCSSUnit_System_Font ||
lh->GetUnit() != eCSSUnit_System_Font ||
family->GetUnit() != eCSSUnit_System_Font ||
stretch->GetUnit() != eCSSUnit_System_Font ||
sizeAdjust->GetUnit() != eCSSUnit_System_Font ||
featureSettings->GetUnit() != eCSSUnit_System_Font ||
languageOverride->GetUnit() != eCSSUnit_System_Font ||
fontKerning->GetUnit() != eCSSUnit_System_Font ||
fontVariantAlternates->GetUnit() != eCSSUnit_System_Font ||
fontVariantCaps->GetUnit() != eCSSUnit_System_Font ||
fontVariantEastAsian->GetUnit() != eCSSUnit_System_Font ||
fontVariantLigatures->GetUnit() != eCSSUnit_System_Font ||
fontVariantNumeric->GetUnit() != eCSSUnit_System_Font ||
fontVariantPosition->GetUnit() != eCSSUnit_System_Font) {
// This can't be represented as a shorthand.
return;
}
systemFont->AppendToString(eCSSProperty__x_system_font, aValue,
aSerialization);
} else {
// properties reset by this shorthand property to their
// initial values but not represented in its syntax
if (sizeAdjust->GetUnit() != eCSSUnit_None ||
featureSettings->GetUnit() != eCSSUnit_Normal ||
languageOverride->GetUnit() != eCSSUnit_Normal ||
fontKerning->GetIntValue() != NS_FONT_KERNING_AUTO ||
fontVariantAlternates->GetUnit() != eCSSUnit_Normal ||
fontVariantEastAsian->GetUnit() != eCSSUnit_Normal ||
fontVariantLigatures->GetUnit() != eCSSUnit_Normal ||
fontVariantNumeric->GetUnit() != eCSSUnit_Normal ||
fontVariantPosition->GetUnit() != eCSSUnit_Normal) {
return;
}
// only a normal or small-caps values of font-variant-caps can
// be represented in the font shorthand
if (fontVariantCaps->GetUnit() != eCSSUnit_Normal &&
(fontVariantCaps->GetUnit() != eCSSUnit_Enumerated ||
fontVariantCaps->GetIntValue() != NS_FONT_VARIANT_CAPS_SMALLCAPS)) {
return;
}
if (style->GetUnit() != eCSSUnit_Enumerated ||
style->GetIntValue() != NS_FONT_STYLE_NORMAL) {
style->AppendToString(eCSSProperty_font_style, aValue,
aSerialization);
aValue.Append(char16_t(' '));
}
if (fontVariantCaps->GetUnit() != eCSSUnit_Normal) {
fontVariantCaps->AppendToString(eCSSProperty_font_variant_caps, aValue,
aSerialization);
aValue.Append(char16_t(' '));
}
if (weight->GetUnit() != eCSSUnit_Enumerated ||
weight->GetIntValue() != NS_FONT_WEIGHT_NORMAL) {
weight->AppendToString(eCSSProperty_font_weight, aValue,
aSerialization);
aValue.Append(char16_t(' '));
}
if (stretch->GetUnit() != eCSSUnit_Enumerated ||
stretch->GetIntValue() != NS_FONT_STRETCH_NORMAL) {
stretch->AppendToString(eCSSProperty_font_stretch, aValue,
aSerialization);
aValue.Append(char16_t(' '));
}
size->AppendToString(eCSSProperty_font_size, aValue, aSerialization);
if (lh->GetUnit() != eCSSUnit_Normal) {
aValue.Append(char16_t('/'));
lh->AppendToString(eCSSProperty_line_height, aValue, aSerialization);
}
aValue.Append(char16_t(' '));
family->AppendToString(eCSSProperty_font_family, aValue,
aSerialization);
}
break;
}
case eCSSProperty_font_variant: {
const nsCSSPropertyID *subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
const nsCSSValue *fontVariantLigatures =
data->ValueFor(eCSSProperty_font_variant_ligatures);
// all subproperty values normal? system font?
bool normalLigs = true, normalNonLigs = true, systemFont = true,
hasSystem = false;
for (const nsCSSPropertyID *sp = subprops; *sp != eCSSProperty_UNKNOWN; sp++) {
const nsCSSValue *spVal = data->ValueFor(*sp);
bool isNormal = (spVal->GetUnit() == eCSSUnit_Normal);
if (*sp == eCSSProperty_font_variant_ligatures) {
normalLigs = normalLigs && isNormal;
} else {
normalNonLigs = normalNonLigs && isNormal;
}
bool isSystem = (spVal->GetUnit() == eCSSUnit_System_Font);
systemFont = systemFont && isSystem;
hasSystem = hasSystem || isSystem;
}
bool ligsNone =
fontVariantLigatures->GetUnit() == eCSSUnit_None;
// normal, none, or system font ==> single value
if ((normalLigs && normalNonLigs) ||
(normalNonLigs && ligsNone) ||
systemFont) {
fontVariantLigatures->AppendToString(eCSSProperty_font_variant_ligatures,
aValue,
aSerialization);
} else if (ligsNone || hasSystem) {
// ligatures none but other values are non-normal ==> empty
// at least one but not all values are system font ==> empty
return;
} else {
// iterate over and append non-normal values
bool appendSpace = false;
for (const nsCSSPropertyID *sp = subprops;
*sp != eCSSProperty_UNKNOWN; sp++) {