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fune/layout/style/Declaration.cpp
Botond Ballo 978ae3283a Bug 951793 - Style support for overscroll-behavior. r=heycam 
MozReview-Commit-ID: IDAfBZy2D5p
2017-11-25 01:28:58 +01:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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);
}
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); });
}
bool
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");
bool removed = false;
if (nsCSSProps::IsShorthand(aProperty)) {
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aProperty,
CSSEnabledState::eForAllContent) {
data.ClearLonghandProperty(*p);
if (mOrder.RemoveElement(static_cast<uint32_t>(*p))) {
removed = true;
}
}
} else {
data.ClearLonghandProperty(aProperty);
removed = mOrder.RemoveElement(static_cast<uint32_t>(aProperty));
}
CompressFrom(&data);
return removed;
}
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,
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);
return true;
}
static void
AppendSingleImageLayerPositionValue(const nsCSSValue& aPositionX,
const nsCSSValue& aPositionY,
const nsCSSPropertyID aTable[],
nsAString& aValue)
{
// 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);
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);
}
void
Declaration::GetImageLayerValue(
nsCSSCompressedDataBlock *data,
nsAString& aValue,
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);
aValue.Append(char16_t(' '));
}
}
image->mValue.AppendToString(aTable[nsStyleImageLayers::image], aValue);
aValue.Append(char16_t(' '));
repeat->mXValue.AppendToString(aTable[nsStyleImageLayers::repeat], aValue);
if (repeat->mYValue.GetUnit() != eCSSUnit_Null) {
repeat->mYValue.AppendToString(aTable[nsStyleImageLayers::repeat], aValue);
}
if (attachment) {
aValue.Append(char16_t(' '));
attachment->mValue.AppendToString(aTable[nsStyleImageLayers::attachment],
aValue);
}
aValue.Append(char16_t(' '));
AppendSingleImageLayerPositionValue(positionX->mValue, positionY->mValue,
aTable, aValue);
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);
aValue.Append(char16_t(' '));
size->mYValue.AppendToString(aTable[nsStyleImageLayers::size], aValue);
}
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);
if (clip->mValue != origin->mValue) {
aValue.Append(char16_t(' '));
clip->mValue.AppendToString(aTable[nsStyleImageLayers::clip], aValue);
}
}
if (composite) {
aValue.Append(char16_t(' '));
composite->mValue.AppendToString(aTable[nsStyleImageLayers::composite],
aValue);
}
if (mode) {
aValue.Append(char16_t(' '));
mode->mValue.AppendToString(aTable[nsStyleImageLayers::maskMode], aValue);
}
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 {
MOZ_ASSERT(aTable == nsStyleImageLayers::kMaskLayerTable);
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 {
MOZ_ASSERT(aTable == nsStyleImageLayers::kMaskLayerTable);
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,
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);
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,
bool* aIsTokenStream) const
{
aValue.Truncate(0);
if (aIsTokenStream) {
*aIsTokenStream = false;
}
// simple properties are easy.
if (!nsCSSProps::IsShorthand(aProperty)) {
AppendValueToString(aProperty, aValue, 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);
return;
}
if (inheritCount == totalCount) {
// Simplify serialization below by serializing inherit up-front.
nsCSSValue(eCSSUnit_Inherit).AppendToString(eCSSProperty_UNKNOWN, aValue);
return;
}
if (unsetCount == totalCount) {
// Simplify serialization below by serializing unset up-front.
nsCSSValue(eCSSUnit_Unset).AppendToString(eCSSProperty_UNKNOWN, aValue);
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);
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);
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);
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);
if (!widthDefault || !outsetDefault) {
aValue.AppendLiteral(" /");
if (!widthDefault) {
aValue.Append(char16_t(' '));
AppendValueToString(eCSSProperty_border_image_width, aValue);
}
if (!outsetDefault) {
aValue.AppendLiteral(" / ");
AppendValueToString(eCSSProperty_border_image_outset, aValue);
}
}
}
bool repeatDefault = data->HasDefaultBorderImageRepeat();
if (!repeatDefault) {
aValue.Append(char16_t(' '));
AppendValueToString(eCSSProperty_border_image_repeat, aValue);
}
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");
bool ok = AppendValueToString(subprops[0], aValue);
if (ok) {
aValue.Append(u' ');
ok = AppendValueToString(subprops[1], aValue);
if (ok) {
const nsCSSValue *colorValue = data->ValueFor(subprops[2]);
bool isCurrentColor =
colorValue->GetUnit() == eCSSUnit_EnumColor &&
colorValue->GetIntValue() == NS_COLOR_CURRENTCOLOR;
// Don't output a third value when it's currentcolor.
if (!isCurrentColor) {
aValue.Append(u' ');
ok = AppendValueToString(subprops[2], aValue);
}
}
}
if (!ok) {
aValue.Truncate();
}
break;
}
case eCSSProperty_background: {
GetImageLayerValue(data, aValue,
nsStyleImageLayers::kBackgroundLayerTable);
break;
}
case eCSSProperty_background_position: {
GetImageLayerPositionValue(data, aValue,
nsStyleImageLayers::kBackgroundLayerTable);
break;
}
case eCSSProperty_mask: {
GetImageLayerValue(data, aValue, nsStyleImageLayers::kMaskLayerTable);
break;
}
case eCSSProperty_mask_position: {
GetImageLayerPositionValue(data, aValue,
nsStyleImageLayers::kMaskLayerTable);
break;
}
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);
} 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);
aValue.Append(char16_t(' '));
}
if (fontVariantCaps->GetUnit() != eCSSUnit_Normal) {
fontVariantCaps->AppendToString(eCSSProperty_font_variant_caps,
aValue);
aValue.Append(char16_t(' '));
}
if (weight->GetUnit() != eCSSUnit_Enumerated ||
weight->GetIntValue() != NS_FONT_WEIGHT_NORMAL) {
weight->AppendToString(eCSSProperty_font_weight, aValue);
aValue.Append(char16_t(' '));
}
if (stretch->GetUnit() != eCSSUnit_Enumerated ||
stretch->GetIntValue() != NS_FONT_STRETCH_NORMAL) {
stretch->AppendToString(eCSSProperty_font_stretch, aValue);
aValue.Append(char16_t(' '));
}
size->AppendToString(eCSSProperty_font_size, aValue);
if (lh->GetUnit() != eCSSUnit_Normal) {
aValue.Append(char16_t('/'));
lh->AppendToString(eCSSProperty_line_height, aValue);
}
aValue.Append(char16_t(' '));
family->AppendToString(eCSSProperty_font_family, aValue);
}
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);
} 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++) {
const nsCSSValue *spVal = data->ValueFor(*sp);
if (spVal && spVal->GetUnit() != eCSSUnit_Normal) {
if (appendSpace) {
aValue.Append(char16_t(' '));
} else {
appendSpace = true;
}
spVal->AppendToString(*sp, aValue);
}
}
}
break;
}
case eCSSProperty_list_style:
if (AppendValueToString(eCSSProperty_list_style_position, aValue)) {
aValue.Append(char16_t(' '));
}
if (AppendValueToString(eCSSProperty_list_style_image, aValue)) {
aValue.Append(char16_t(' '));
}
AppendValueToString(eCSSProperty_list_style_type, aValue);
break;
case eCSSProperty_overflow: {
const nsCSSValue &xValue =
*data->ValueFor(eCSSProperty_overflow_x);
const nsCSSValue &yValue =
*data->ValueFor(eCSSProperty_overflow_y);
if (xValue == yValue)
xValue.AppendToString(eCSSProperty_overflow_x, aValue);
break;
}
case eCSSProperty_text_decoration: {
const nsCSSValue *decorationColor =
data->ValueFor(eCSSProperty_text_decoration_color);
const nsCSSValue *decorationStyle =
data->ValueFor(eCSSProperty_text_decoration_style);
MOZ_ASSERT(decorationStyle->GetUnit() == eCSSUnit_Enumerated,
"bad text-decoration-style unit");
AppendValueToString(eCSSProperty_text_decoration_line, aValue);
if (decorationStyle->GetIntValue() !=
NS_STYLE_TEXT_DECORATION_STYLE_SOLID) {
aValue.Append(char16_t(' '));
AppendValueToString(eCSSProperty_text_decoration_style, aValue);
}
if (decorationColor->GetUnit() != eCSSUnit_EnumColor ||
decorationColor->GetIntValue() != NS_COLOR_CURRENTCOLOR) {
aValue.Append(char16_t(' '));
AppendValueToString(eCSSProperty_text_decoration_color, aValue);
}
break;
}
case eCSSProperty_transition: {
const nsCSSValue *transProp =
data->ValueFor(eCSSProperty_transition_property);
const nsCSSValue *transDuration =
data->ValueFor(eCSSProperty_transition_duration);
const nsCSSValue *transTiming =
data->ValueFor(eCSSProperty_transition_timing_function);
const nsCSSValue *transDelay =
data->ValueFor(eCSSProperty_transition_delay);
MOZ_ASSERT(transDuration->GetUnit() == eCSSUnit_List ||
transDuration->GetUnit() == eCSSUnit_ListDep,
"bad t-duration unit");
MOZ_ASSERT(transTiming->GetUnit() == eCSSUnit_List ||
transTiming->GetUnit() == eCSSUnit_ListDep,
"bad t-timing unit");
MOZ_ASSERT(transDelay->GetUnit() == eCSSUnit_List ||
transDelay->GetUnit() == eCSSUnit_ListDep,
"bad t-delay unit");
const nsCSSValueList* dur = transDuration->GetListValue();
const nsCSSValueList* tim = transTiming->GetListValue();
const nsCSSValueList* del = transDelay->GetListValue();
if (transProp->GetUnit() == eCSSUnit_None ||
transProp->GetUnit() == eCSSUnit_All) {
// If any of the other three lists has more than one element,
// we can't use the shorthand.
if (!dur->mNext && !tim->mNext && !del->mNext) {
transProp->AppendToString(eCSSProperty_transition_property, aValue);
aValue.Append(char16_t(' '));
dur->mValue.AppendToString(eCSSProperty_transition_duration, aValue);
aValue.Append(char16_t(' '));
tim->mValue.AppendToString(eCSSProperty_transition_timing_function,
aValue);
aValue.Append(char16_t(' '));
del->mValue.AppendToString(eCSSProperty_transition_delay, aValue);
aValue.Append(char16_t(' '));
} else {
aValue.Truncate();
}
} else {
MOZ_ASSERT(transProp->GetUnit() == eCSSUnit_List ||
transProp->GetUnit() == eCSSUnit_ListDep,
"bad t-prop unit");
const nsCSSValueList* pro = transProp->GetListValue();
for (;;) {
pro->mValue.AppendToString(eCSSProperty_transition_property, aValue);
aValue.Append(char16_t(' '));
dur->mValue.AppendToString(eCSSProperty_transition_duration, aValue);
aValue.Append(char16_t(' '));
tim->mValue.AppendToString(eCSSProperty_transition_timing_function,
aValue);
aValue.Append(char16_t(' '));
del->mValue.AppendToString(eCSSProperty_transition_delay,
aValue);
pro = pro->mNext;
dur = dur->mNext;
tim = tim->mNext;
del = del->mNext;
if (!pro || !dur || !tim || !del) {
break;
}
aValue.AppendLiteral(", ");
}
if (pro || dur || tim || del) {
// Lists not all the same length, can't use shorthand.
aValue.Truncate();
}
}
break;
}
case eCSSProperty_animation: {
const nsCSSPropertyID* subprops =
nsCSSProps::SubpropertyEntryFor(eCSSProperty_animation);
static const size_t numProps = 8;
MOZ_ASSERT(subprops[numProps] == eCSSProperty_UNKNOWN,
"unexpected number of subproperties");
const nsCSSValue* values[numProps];
const nsCSSValueList* lists[numProps];
for (uint32_t i = 0; i < numProps; ++i) {
values[i] = data->ValueFor(subprops[i]);
MOZ_ASSERT(values[i]->GetUnit() == eCSSUnit_List ||
values[i]->GetUnit() == eCSSUnit_ListDep,
"bad a-duration unit");
lists[i] = values[i]->GetListValue();
}
for (;;) {
// We must serialize 'animation-name' last in case it has
// a value that conflicts with one of the other keyword properties.
MOZ_ASSERT(subprops[numProps - 1] == eCSSProperty_animation_name,
"animation-name must be last");
bool done = false;
for (uint32_t i = 0;;) {
lists[i]->mValue.AppendToString(subprops[i], aValue);
lists[i] = lists[i]->mNext;
if (!lists[i]) {
done = true;
}
if (++i == numProps) {
break;
}
aValue.Append(char16_t(' '));
}
if (done) {
break;
}
aValue.AppendLiteral(", ");
}
for (uint32_t i = 0; i < numProps; ++i) {
if (lists[i]) {
// Lists not all the same length, can't use shorthand.
aValue.Truncate();
break;
}
}
break;
}
case eCSSProperty_marker: {
const nsCSSValue &endValue =
*data->ValueFor(eCSSProperty_marker_end);
const nsCSSValue &midValue =
*data->ValueFor(eCSSProperty_marker_mid);
const nsCSSValue &startValue =
*data->ValueFor(eCSSProperty_marker_start);
if (endValue == midValue && midValue == startValue)
AppendValueToString(eCSSProperty_marker_end, aValue);
break;
}
case eCSSProperty_columns: {
// Two values, column-count and column-width, separated by a space.
const nsCSSPropertyID* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
AppendValueToString(subprops[0], aValue);
aValue.Append(char16_t(' '));
AppendValueToString(subprops[1], aValue);
break;
}
case eCSSProperty_flex: {
// flex-grow, flex-shrink, flex-basis, separated by single space
const nsCSSPropertyID* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
AppendValueToString(subprops[0], aValue);
aValue.Append(char16_t(' '));
AppendValueToString(subprops[1], aValue);
aValue.Append(char16_t(' '));
AppendValueToString(subprops[2], aValue);
break;
}
case eCSSProperty_flex_flow: {
// flex-direction, flex-wrap, separated by single space
const nsCSSPropertyID* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
MOZ_ASSERT(subprops[2] == eCSSProperty_UNKNOWN,
"must have exactly two subproperties");
AppendValueToString(subprops[0], aValue);
aValue.Append(char16_t(' '));
AppendValueToString(subprops[1], aValue);
break;
}
case eCSSProperty_grid_row:
case eCSSProperty_grid_column: {
// grid-{row,column}-start, grid-{row,column}-end, separated by a slash
const nsCSSPropertyID* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
MOZ_ASSERT(subprops[2] == eCSSProperty_UNKNOWN,
"must have exactly two subproperties");
// TODO: should we simplify when possible?
AppendValueToString(subprops[0], aValue);
aValue.AppendLiteral(" / ");
AppendValueToString(subprops[1], aValue);
break;
}
case eCSSProperty_grid_area: {
const nsCSSPropertyID* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
MOZ_ASSERT(subprops[4] == eCSSProperty_UNKNOWN,
"must have exactly four subproperties");
// TODO: should we simplify when possible?
AppendValueToString(subprops[0], aValue);
aValue.AppendLiteral(" / ");
AppendValueToString(subprops[1], aValue);
aValue.AppendLiteral(" / ");
AppendValueToString(subprops[2], aValue);
aValue.AppendLiteral(" / ");
AppendValueToString(subprops[3], aValue);
break;
}
// The 'grid' shorthand has 3 different possibilities for syntax:
// #1 <'grid-template'>
// #2 <'grid-template-rows'> / [ auto-flow && dense? ] <'grid-auto-columns'>?
// #3 [ auto-flow && dense? ] <'grid-auto-rows'>? / <'grid-template-columns'>
case eCSSProperty_grid: {
const nsCSSValue& areasValue =
*data->ValueFor(eCSSProperty_grid_template_areas);
const nsCSSValue& columnsValue =
*data->ValueFor(eCSSProperty_grid_template_columns);
const nsCSSValue& rowsValue =
*data->ValueFor(eCSSProperty_grid_template_rows);
const nsCSSValue& autoFlowValue =
*data->ValueFor(eCSSProperty_grid_auto_flow);
const nsCSSValue& autoColumnsValue =
*data->ValueFor(eCSSProperty_grid_auto_columns);
const nsCSSValue& autoRowsValue =
*data->ValueFor(eCSSProperty_grid_auto_rows);
// grid-template-rows/areas:none + default grid-auto-columns +
// non-default row grid-auto-flow or grid-auto-rows.
// --> serialize as 'grid' syntax #3.
// (for default grid-auto-flow/rows we prefer to serialize to
// "none ['/' ...]" instead using syntax #2 or #1 below)
if (rowsValue.GetUnit() == eCSSUnit_None &&
areasValue.GetUnit() == eCSSUnit_None &&
autoColumnsValue.GetUnit() == eCSSUnit_Auto &&
autoFlowValue.GetUnit() == eCSSUnit_Enumerated &&
(autoFlowValue.GetIntValue() & NS_STYLE_GRID_AUTO_FLOW_ROW) &&
(autoFlowValue.GetIntValue() != NS_STYLE_GRID_AUTO_FLOW_ROW ||
autoRowsValue.GetUnit() != eCSSUnit_Auto)) {
aValue.AppendLiteral("auto-flow");
if (autoFlowValue.GetIntValue() & NS_STYLE_GRID_AUTO_FLOW_DENSE) {
aValue.AppendLiteral(" dense");
}
if (autoRowsValue.GetUnit() != eCSSUnit_Auto) {
aValue.Append(' ');
AppendValueToString(eCSSProperty_grid_auto_rows, aValue);
}
aValue.AppendLiteral(" / ");
AppendValueToString(eCSSProperty_grid_template_columns, aValue);
break;
}
// grid-template-columns/areas:none + column grid-auto-flow +
// default grid-auto-rows.
// --> serialize as 'grid' syntax #2.
if (columnsValue.GetUnit() == eCSSUnit_None &&
areasValue.GetUnit() == eCSSUnit_None &&
autoRowsValue.GetUnit() == eCSSUnit_Auto &&
autoFlowValue.GetUnit() == eCSSUnit_Enumerated &&
(autoFlowValue.GetIntValue() & NS_STYLE_GRID_AUTO_FLOW_COLUMN)) {
AppendValueToString(eCSSProperty_grid_template_rows, aValue);
aValue.AppendLiteral(" / auto-flow ");
if (autoFlowValue.GetIntValue() & NS_STYLE_GRID_AUTO_FLOW_DENSE) {
aValue.AppendLiteral("dense ");
}
AppendValueToString(eCSSProperty_grid_auto_columns, aValue);
break;
}
if (!(autoFlowValue.GetUnit() == eCSSUnit_Enumerated &&
autoFlowValue.GetIntValue() == NS_STYLE_GRID_AUTO_FLOW_ROW &&
autoColumnsValue.GetUnit() == eCSSUnit_Auto &&
autoRowsValue.GetUnit() == eCSSUnit_Auto)) {
// Not serializable, bail.
return;
}
// Fall through to eCSSProperty_grid_template (syntax #1)
MOZ_FALLTHROUGH;
}
case eCSSProperty_grid_template: {
const nsCSSValue& areasValue =
*data->ValueFor(eCSSProperty_grid_template_areas);
const nsCSSValue& columnsValue =
*data->ValueFor(eCSSProperty_grid_template_columns);
const nsCSSValue& rowsValue =
*data->ValueFor(eCSSProperty_grid_template_rows);
if (areasValue.GetUnit() == eCSSUnit_None) {
AppendValueToString(eCSSProperty_grid_template_rows, aValue);
aValue.AppendLiteral(" / ");
AppendValueToString(eCSSProperty_grid_template_columns, aValue);
break;
}
if (columnsValue.GetUnit() == eCSSUnit_List ||
columnsValue.GetUnit() == eCSSUnit_ListDep) {
const nsCSSValueList* columnsItem = columnsValue.GetListValue();
if (columnsItem->mValue.GetUnit() == eCSSUnit_Enumerated &&
columnsItem->mValue.GetIntValue() == NS_STYLE_GRID_TEMPLATE_SUBGRID) {
// We have "grid-template-areas:[something]; grid-template-columns:subgrid"
// which isn't a value that the shorthand can express. Bail.
return;
}
}
if (rowsValue.GetUnit() != eCSSUnit_List &&
rowsValue.GetUnit() != eCSSUnit_ListDep) {
// We have "grid-template-areas:[something]; grid-template-rows:none"
// which isn't a value that the shorthand can express. Bail.
return;
}
const nsCSSValueList* rowsItem = rowsValue.GetListValue();
if (rowsItem->mValue.GetUnit() == eCSSUnit_Enumerated &&
rowsItem->mValue.GetIntValue() == NS_STYLE_GRID_TEMPLATE_SUBGRID) {
// We have "grid-template-areas:[something]; grid-template-rows:subgrid"
// which isn't a value that the shorthand can express. Bail.
return;
}
const GridTemplateAreasValue* areas = areasValue.GetGridTemplateAreas();
uint32_t nRowItems = 0;
while (rowsItem) {
nRowItems++;
rowsItem = rowsItem->mNext;
}
MOZ_ASSERT(nRowItems % 2 == 1, "expected an odd number of items");
if ((nRowItems - 1) / 2 != areas->NRows()) {
// Not serializable, bail.
return;
}
rowsItem = rowsValue.GetListValue();
uint32_t row = 0;
for (;;) {
bool addSpaceSeparator = true;
nsCSSUnit unit = rowsItem->mValue.GetUnit();
if (unit == eCSSUnit_Null) {
// Empty or omitted <line-names>. Serializes to nothing.
addSpaceSeparator = false; // Avoid a double space.
} else if (unit == eCSSUnit_List || unit == eCSSUnit_ListDep) {
// Non-empty <line-names>
aValue.Append('[');
rowsItem->mValue.AppendToString(eCSSProperty_grid_template_rows,
aValue);
aValue.Append(']');
} else {
nsStyleUtil::AppendEscapedCSSString(areas->mTemplates[row++], aValue);
aValue.Append(char16_t(' '));
// <track-size>
if (unit == eCSSUnit_Pair) {
// 'repeat()' isn't allowed with non-default 'grid-template-areas'.
aValue.Truncate();
return;
}
rowsItem->mValue.AppendToString(eCSSProperty_grid_template_rows,
aValue);
if (rowsItem->mNext &&
rowsItem->mNext->mValue.GetUnit() == eCSSUnit_Null &&
!rowsItem->mNext->mNext) {
// Break out of the loop early to avoid a trailing space.
break;
}
}
rowsItem = rowsItem->mNext;
if (!rowsItem) {
break;
}
if (addSpaceSeparator) {
aValue.Append(char16_t(' '));
}
}
if (columnsValue.GetUnit() != eCSSUnit_None) {
const nsCSSValueList* colsItem = columnsValue.GetListValue();
colsItem = colsItem->mNext; // first value is <line-names>
for (; colsItem; colsItem = colsItem->mNext) {
if (colsItem->mValue.GetUnit() == eCSSUnit_Pair) {
// 'repeat()' isn't allowed with non-default 'grid-template-areas'.
aValue.Truncate();
return;
}
colsItem = colsItem->mNext; // skip <line-names>
}
aValue.AppendLiteral(" / ");
AppendValueToString(eCSSProperty_grid_template_columns, aValue);
}
break;
}
case eCSSProperty_place_content:
case eCSSProperty_place_items:
case eCSSProperty_place_self: {
const nsCSSPropertyID* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
MOZ_ASSERT(subprops[2] == eCSSProperty_UNKNOWN,
"must have exactly two subproperties");
auto IsSingleValue = [] (const nsCSSValue& aValue) {
switch (aValue.GetUnit()) {
case eCSSUnit_Auto:
case eCSSUnit_Inherit:
case eCSSUnit_Initial:
case eCSSUnit_Unset:
return true;
case eCSSUnit_Enumerated:
// return false if there is a fallback value or <overflow-position>
return aValue.GetIntValue() <= NS_STYLE_JUSTIFY_SPACE_EVENLY;
default:
MOZ_ASSERT_UNREACHABLE("Unexpected unit for CSS Align property val");
return false;
}
};
// Each value must be a single value (i.e. no fallback value and no
// <overflow-position>), otherwise it can't be represented as a shorthand
// value. ('first|last baseline' counts as a single value)
const nsCSSValue* align = data->ValueFor(subprops[0]);
const nsCSSValue* justify = data->ValueFor(subprops[1]);
if (!align || !IsSingleValue(*align) ||
!justify || !IsSingleValue(*justify)) {
return; // Not serializable, bail.
}
MOZ_FALLTHROUGH;
}
case eCSSProperty_grid_gap: {
const nsCSSPropertyID* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
MOZ_ASSERT(subprops[2] == eCSSProperty_UNKNOWN,
"must have exactly two subproperties");
nsAutoString val1, val2;
AppendValueToString(subprops[0], val1);
AppendValueToString(subprops[1], val2);
if (val1 == val2) {
aValue.Append(val1);
} else {
aValue.Append(val1);
aValue.Append(' ');
aValue.Append(val2);
}
break;
}
case eCSSProperty_text_emphasis: {
const nsCSSValue* emphasisStyle =
data->ValueFor(eCSSProperty_text_emphasis_style);
const nsCSSValue* emphasisColor =
data->ValueFor(eCSSProperty_text_emphasis_color);
bool isDefaultColor = emphasisColor->GetUnit() == eCSSUnit_EnumColor &&
emphasisColor->GetIntValue() == NS_COLOR_CURRENTCOLOR;
if (emphasisStyle->GetUnit() != eCSSUnit_None || isDefaultColor) {
AppendValueToString(eCSSProperty_text_emphasis_style, aValue);
if (!isDefaultColor) {
aValue.Append(char16_t(' '));
}
}
if (!isDefaultColor) {
AppendValueToString(eCSSProperty_text_emphasis_color, aValue);
}
break;
}
case eCSSProperty__moz_transform: {
// shorthands that are just aliases with different parsing rules
const nsCSSPropertyID* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
MOZ_ASSERT(subprops[1] == eCSSProperty_UNKNOWN,
"must have exactly one subproperty");
AppendValueToString(subprops[0], aValue);
break;
}
case eCSSProperty_overscroll_behavior: {
const nsCSSValue& xValue =
*data->ValueFor(eCSSProperty_overscroll_behavior_x);
const nsCSSValue& yValue =
*data->ValueFor(eCSSProperty_overscroll_behavior_y);
AppendValueToString(eCSSProperty_overscroll_behavior_x, aValue);
if (yValue != xValue) {
aValue.Append(char16_t(' '));
AppendValueToString(eCSSProperty_overscroll_behavior_y, aValue);
}
break;
}
case eCSSProperty_scroll_snap_type: {
const nsCSSValue& xValue =
*data->ValueFor(eCSSProperty_scroll_snap_type_x);
const nsCSSValue& yValue =
*data->ValueFor(eCSSProperty_scroll_snap_type_y);
if (xValue == yValue) {
AppendValueToString(eCSSProperty_scroll_snap_type_x, aValue);
}
// If scroll-snap-type-x and scroll-snap-type-y are not equal,
// we don't have a shorthand that can express. Bail.
break;
}
case eCSSProperty__webkit_text_stroke: {
const nsCSSValue* strokeWidth =
data->ValueFor(eCSSProperty__webkit_text_stroke_width);
const nsCSSValue* strokeColor =
data->ValueFor(eCSSProperty__webkit_text_stroke_color);
bool isDefaultColor = strokeColor->GetUnit() == eCSSUnit_EnumColor &&
strokeColor->GetIntValue() == NS_COLOR_CURRENTCOLOR;
if (strokeWidth->GetUnit() != eCSSUnit_Integer ||
strokeWidth->GetIntValue() != 0 || isDefaultColor) {
AppendValueToString(eCSSProperty__webkit_text_stroke_width, aValue);
if (!isDefaultColor) {
aValue.Append(char16_t(' '));
}
}
if (!isDefaultColor) {
AppendValueToString(eCSSProperty__webkit_text_stroke_color, aValue);
}
break;
}
case eCSSProperty_all:
// If we got here, then we didn't have all "inherit" or "initial" or
// "unset" values for all of the longhand property components of 'all'.
// There is no other possible value that is valid for all properties,
// so serialize as the empty string.
break;
default:
MOZ_ASSERT(false, "no other shorthands");
break;
}
}
bool
Declaration::GetPropertyIsImportantByID(nsCSSPropertyID aProperty) const
{
if (!mImportantData)
return false;
// Calling ValueFor is inefficient, but we can assume '!important' is rare.
if (!nsCSSProps::IsShorthand(aProperty)) {
return mImportantData->ValueFor(aProperty) != nullptr;
}
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aProperty,
CSSEnabledState::eForAllContent) {
if (*p == eCSSProperty__x_system_font) {
// The system_font subproperty doesn't count.
continue;
}
if (!mImportantData->ValueFor(*p)) {
return false;
}
}
return true;
}
void
Declaration::AppendPropertyAndValueToString(nsCSSPropertyID aProperty,
nsAString& aResult,
nsAutoString& aValue,
bool aValueIsTokenStream) const
{
MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT,
"property enum out of range");
MOZ_ASSERT((aProperty < eCSSProperty_COUNT_no_shorthands) == aValue.IsEmpty(),
"aValue should be given for shorthands but not longhands");
AppendASCIItoUTF16(nsCSSProps::GetStringValue(aProperty), aResult);
if (aValue.IsEmpty()) {
AppendValueToString(aProperty, aValue, &aValueIsTokenStream);
}
aResult.Append(':');
if (!aValueIsTokenStream) {
aResult.Append(' ');
}
aResult.Append(aValue);
if (GetPropertyIsImportantByID(aProperty)) {
if (!aValueIsTokenStream) {
aResult.Append(' ');
}
aResult.AppendLiteral("!important");
}
aResult.AppendLiteral("; ");
}
void
Declaration::AppendVariableAndValueToString(const nsAString& aName,
nsAString& aResult) const
{
nsAutoString localName;
localName.AppendLiteral("--");
localName.Append(aName);
nsStyleUtil::AppendEscapedCSSIdent(localName, aResult);
CSSVariableDeclarations::Type type;
nsString value;
bool important;
if (mImportantVariables && mImportantVariables->Get(aName, type, value)) {
important = true;
} else {
MOZ_ASSERT(mVariables);
MOZ_ASSERT(mVariables->Has(aName));
mVariables->Get(aName, type, value);
important = false;
}
bool isTokenStream = type == CSSVariableDeclarations::eTokenStream;
aResult.Append(':');
if (!isTokenStream) {
aResult.Append(' ');
}
switch (type) {
case CSSVariableDeclarations::eTokenStream:
aResult.Append(value);
break;
case CSSVariableDeclarations::eInitial:
aResult.AppendLiteral("initial");
break;
case CSSVariableDeclarations::eInherit:
aResult.AppendLiteral("inherit");
break;
case CSSVariableDeclarations::eUnset:
aResult.AppendLiteral("unset");
break;
default:
MOZ_ASSERT(false, "unexpected variable value type");
}
if (important) {
if (!isTokenStream) {
aResult.Append(' ');
}
aResult.AppendLiteral("!important");
}
aResult.AppendLiteral("; ");
}
void
Declaration::ToString(nsAString& aString) const
{
// Tell the static analysis not to worry about thread-unsafe things here
// because because this function isn't reached during parallel style traversal.
MOZ_ASSERT(!ServoStyleSet::IsInServoTraversal());
nsCSSCompressedDataBlock *systemFontData =
GetPropertyIsImportantByID(eCSSProperty__x_system_font) ? mImportantData
: mData;
const nsCSSValue *systemFont =
systemFontData->ValueFor(eCSSProperty__x_system_font);
const bool haveSystemFont = systemFont &&
systemFont->GetUnit() != eCSSUnit_None &&
systemFont->GetUnit() != eCSSUnit_Null;
bool didSystemFont = false;
int32_t count = mOrder.Length();
int32_t index;
AutoTArray<nsCSSPropertyID, 16> shorthandsUsed;
for (index = 0; index < count; index++) {
nsCSSPropertyID property = GetPropertyAt(index);
if (property == eCSSPropertyExtra_variable) {
uint32_t variableIndex = mOrder[index] - eCSSProperty_COUNT;
AppendVariableAndValueToString(mVariableOrder[variableIndex], aString);
continue;
}
if (!nsCSSProps::IsEnabled(property, CSSEnabledState::eForAllContent)) {
continue;
}
bool doneProperty = false;
// If we already used this property in a shorthand, skip it.
if (shorthandsUsed.Length() > 0) {
for (const nsCSSPropertyID *shorthands =
nsCSSProps::ShorthandsContaining(property);
*shorthands != eCSSProperty_UNKNOWN; ++shorthands) {
if (shorthandsUsed.Contains(*shorthands)) {
doneProperty = true;
break;
}
}
if (doneProperty)
continue;
}
// Try to use this property in a shorthand.
nsAutoString value;
for (const nsCSSPropertyID *shorthands =
nsCSSProps::ShorthandsContaining(property);
*shorthands != eCSSProperty_UNKNOWN; ++shorthands) {
// ShorthandsContaining returns the shorthands in order from those
// that contain the most subproperties to those that contain the
// least, which is exactly the order we want to test them.
nsCSSPropertyID shorthand = *shorthands;
bool isTokenStream;
GetPropertyValueInternal(shorthand, value, &isTokenStream);
// in the system font case, skip over font-variant shorthand, since all
// subproperties are already dealt with via the font shorthand
if (shorthand == eCSSProperty_font_variant &&
value.EqualsLiteral("-moz-use-system-font")) {
continue;
}
// If GetPropertyValueInternal gives us a non-empty string back, we can
// use that value; otherwise it's not possible to use this shorthand.
if (!value.IsEmpty()) {
AppendPropertyAndValueToString(shorthand, aString,
value, isTokenStream);
shorthandsUsed.AppendElement(shorthand);
doneProperty = true;
break;
}
if (shorthand == eCSSProperty_font) {
if (haveSystemFont && !didSystemFont) {
// Output the shorthand font declaration that we will
// partially override later. But don't add it to
// |shorthandsUsed|, since we will have to override it.
systemFont->AppendToString(eCSSProperty__x_system_font, value);
isTokenStream = systemFont->GetUnit() == eCSSUnit_TokenStream;
AppendPropertyAndValueToString(eCSSProperty_font, aString,
value, isTokenStream);
value.Truncate();
didSystemFont = true;
}
// That we output the system font is enough for this property if:
// (1) it's the hidden system font subproperty (which either
// means we output it or we don't have it), or
// (2) its value is the hidden system font value and it matches
// the hidden system font subproperty in importance, and
// we output the system font subproperty.
const nsCSSValue *val = systemFontData->ValueFor(property);
if (property == eCSSProperty__x_system_font ||
(haveSystemFont && val && val->GetUnit() == eCSSUnit_System_Font)) {
doneProperty = true;
break;
}
}
}
if (doneProperty)
continue;
MOZ_ASSERT(value.IsEmpty(), "value should be empty now");
AppendPropertyAndValueToString(property, aString, value, false);
}
if (! aString.IsEmpty()) {
// if the string is not empty, we have trailing whitespace we
// should remove
aString.Truncate(aString.Length() - 1);
}
}
#ifdef DEBUG
/* virtual */ void
Declaration::List(FILE* out, int32_t aIndent) const
{
const Rule* owningRule = GetOwningRule();
if (owningRule) {
// More useful to print the selector and sheet URI too.
owningRule->List(out, aIndent);
return;
}
nsAutoCString str;
for (int32_t index = aIndent; --index >= 0; ) {
str.AppendLiteral(" ");
}
str.AppendLiteral("{ ");
nsAutoString s;
ToString(s);
AppendUTF16toUTF8(s, str);
str.AppendLiteral("}\n");
fprintf_stderr(out, "%s", str.get());
}
#endif
bool
Declaration::GetNthProperty(uint32_t aIndex, nsAString& aReturn) const
{
aReturn.Truncate();
if (aIndex < mOrder.Length()) {
nsCSSPropertyID property = GetPropertyAt(aIndex);
if (property == eCSSPropertyExtra_variable) {
GetCustomPropertyNameAt(aIndex, aReturn);
return true;
}
if (0 <= property) {
AppendASCIItoUTF16(nsCSSProps::GetStringValue(property), aReturn);
return true;
}
}
return false;
}
void
Declaration::InitializeEmpty()
{
MOZ_ASSERT(!mData && !mImportantData, "already initialized");
mData = nsCSSCompressedDataBlock::CreateEmptyBlock();
}
size_t
Declaration::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
n += mOrder.ShallowSizeOfExcludingThis(aMallocSizeOf);
n += mData ? mData ->SizeOfIncludingThis(aMallocSizeOf) : 0;
n += mImportantData ? mImportantData->SizeOfIncludingThis(aMallocSizeOf) : 0;
if (mVariables) {
n += mVariables->SizeOfIncludingThis(aMallocSizeOf);
}
if (mImportantVariables) {
n += mImportantVariables->SizeOfIncludingThis(aMallocSizeOf);
}
return n;
}
void
Declaration::GetVariableValue(const nsAString& aName, nsAString& aValue) const
{
aValue.Truncate();
CSSVariableDeclarations::Type type;
nsString value;
if ((mImportantVariables && mImportantVariables->Get(aName, type, value)) ||
(mVariables && mVariables->Get(aName, type, value))) {
switch (type) {
case CSSVariableDeclarations::eTokenStream:
aValue.Append(value);
break;
case CSSVariableDeclarations::eInitial:
aValue.AppendLiteral("initial");
break;
case CSSVariableDeclarations::eInherit:
aValue.AppendLiteral("inherit");
break;
case CSSVariableDeclarations::eUnset:
aValue.AppendLiteral("unset");
break;
default:
MOZ_ASSERT(false, "unexpected variable value type");
}
}
}
void
Declaration::AddVariable(const nsAString& aName,
CSSVariableDeclarations::Type aType,
const nsString& aValue,
bool aIsImportant,
bool aOverrideImportant)
{
MOZ_ASSERT(IsMutable());
nsTArray<nsString>::index_type index = mVariableOrder.IndexOf(aName);
if (index == nsTArray<nsString>::NoIndex) {
index = mVariableOrder.Length();
mVariableOrder.AppendElement(aName);
}
if (!aIsImportant && !aOverrideImportant &&
mImportantVariables && mImportantVariables->Has(aName)) {
return;
}
CSSVariableDeclarations* variables;
if (aIsImportant) {
if (mVariables) {
mVariables->Remove(aName);
}
if (!mImportantVariables) {
mImportantVariables = new CSSVariableDeclarations;
}
variables = mImportantVariables;
} else {
if (mImportantVariables) {
mImportantVariables->Remove(aName);
}
if (!mVariables) {
mVariables = new CSSVariableDeclarations;
}
variables = mVariables;
}
switch (aType) {
case CSSVariableDeclarations::eTokenStream:
variables->PutTokenStream(aName, aValue);
break;
case CSSVariableDeclarations::eInitial:
MOZ_ASSERT(aValue.IsEmpty());
variables->PutInitial(aName);
break;
case CSSVariableDeclarations::eInherit:
MOZ_ASSERT(aValue.IsEmpty());
variables->PutInherit(aName);
break;
case CSSVariableDeclarations::eUnset:
MOZ_ASSERT(aValue.IsEmpty());
variables->PutUnset(aName);
break;
default:
MOZ_ASSERT(false, "unexpected aType value");
}
uint32_t propertyIndex = index + eCSSProperty_COUNT;
mOrder.RemoveElement(propertyIndex);
mOrder.AppendElement(propertyIndex);
}
void
Declaration::RemoveVariable(const nsAString& aName)
{
if (mVariables) {
mVariables->Remove(aName);
}
if (mImportantVariables) {
mImportantVariables->Remove(aName);
}
nsTArray<nsString>::index_type index = mVariableOrder.IndexOf(aName);
if (index != nsTArray<nsString>::NoIndex) {
mOrder.RemoveElement(index + eCSSProperty_COUNT);
}
}
bool
Declaration::GetVariableIsImportant(const nsAString& aName) const
{
return mImportantVariables && mImportantVariables->Has(aName);
}
} // namespace css
} // namespace mozilla
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