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gecko-dev/layout/style/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/MemoryReporting.h"
#include "mozilla/Util.h"
#include "mozilla/css/Declaration.h"
#include "nsPrintfCString.h"
#include "mozilla/Preferences.h"
namespace mozilla {
namespace css {
// check that we can fit all the CSS properties into a uint16_t
// for the mOrder array
static_assert(eCSSProperty_COUNT_no_shorthands - 1 <= UINT16_MAX,
"CSS longhand property numbers no longer fit in a uint16_t");
Declaration::Declaration()
: mImmutable(false)
{
MOZ_COUNT_CTOR(mozilla::css::Declaration);
}
Declaration::Declaration(const Declaration& aCopy)
: mOrder(aCopy.mOrder),
mData(aCopy.mData ? aCopy.mData->Clone() : nullptr),
mImportantData(aCopy.mImportantData
? aCopy.mImportantData->Clone() : nullptr),
mImmutable(false)
{
MOZ_COUNT_CTOR(mozilla::css::Declaration);
}
Declaration::~Declaration()
{
MOZ_COUNT_DTOR(mozilla::css::Declaration);
}
void
Declaration::ValueAppended(nsCSSProperty aProperty)
{
NS_ABORT_IF_FALSE(!mData && !mImportantData,
"should only be called while expanded");
NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(aProperty),
"shorthands forbidden");
// order IS important for CSS, so remove and add to the end
mOrder.RemoveElement(aProperty);
mOrder.AppendElement(aProperty);
}
void
Declaration::RemoveProperty(nsCSSProperty aProperty)
{
nsCSSExpandedDataBlock data;
ExpandTo(&data);
NS_ABORT_IF_FALSE(!mData && !mImportantData, "Expand didn't null things out");
if (nsCSSProps::IsShorthand(aProperty)) {
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aProperty) {
data.ClearLonghandProperty(*p);
mOrder.RemoveElement(*p);
}
} else {
data.ClearLonghandProperty(aProperty);
mOrder.RemoveElement(aProperty);
}
CompressFrom(&data);
}
bool
Declaration::HasProperty(nsCSSProperty aProperty) const
{
NS_ABORT_IF_FALSE(0 <= aProperty &&
aProperty < eCSSProperty_COUNT_no_shorthands,
"property ID out of range");
nsCSSCompressedDataBlock *data = GetValueIsImportant(aProperty)
? mImportantData : mData;
const nsCSSValue *val = data->ValueFor(aProperty);
return !!val;
}
bool
Declaration::AppendValueToString(nsCSSProperty aProperty,
nsAString& aResult) const
{
NS_ABORT_IF_FALSE(0 <= aProperty &&
aProperty < eCSSProperty_COUNT_no_shorthands,
"property ID out of range");
nsCSSCompressedDataBlock *data = GetValueIsImportant(aProperty)
? mImportantData : mData;
const nsCSSValue *val = data->ValueFor(aProperty);
if (!val) {
return false;
}
val->AppendToString(aProperty, aResult);
return true;
}
// Helper to append |aString| with the shorthand sides notation used in e.g.
// 'padding'. |aProperties| and |aValues| are expected to have 4 elements.
static void
AppendSidesShorthandToString(const nsCSSProperty aProperties[],
const nsCSSValue* aValues[],
nsAString& aString)
{
const nsCSSValue& value1 = *aValues[0];
const nsCSSValue& value2 = *aValues[1];
const nsCSSValue& value3 = *aValues[2];
const nsCSSValue& value4 = *aValues[3];
NS_ABORT_IF_FALSE(value1.GetUnit() != eCSSUnit_Null, "null value 1");
value1.AppendToString(aProperties[0], aString);
if (value1 != value2 || value1 != value3 || value1 != value4) {
aString.Append(PRUnichar(' '));
NS_ABORT_IF_FALSE(value2.GetUnit() != eCSSUnit_Null, "null value 2");
value2.AppendToString(aProperties[1], aString);
if (value1 != value3 || value2 != value4) {
aString.Append(PRUnichar(' '));
NS_ABORT_IF_FALSE(value3.GetUnit() != eCSSUnit_Null, "null value 3");
value3.AppendToString(aProperties[2], aString);
if (value2 != value4) {
aString.Append(PRUnichar(' '));
NS_ABORT_IF_FALSE(value4.GetUnit() != eCSSUnit_Null, "null value 4");
value4.AppendToString(aProperties[3], aString);
}
}
}
}
void
Declaration::GetValue(nsCSSProperty aProperty, nsAString& aValue) const
{
aValue.Truncate(0);
// simple properties are easy.
if (!nsCSSProps::IsShorthand(aProperty)) {
AppendValueToString(aProperty, aValue);
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' and 'initial' 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.
uint32_t totalCount = 0, importantCount = 0,
initialCount = 0, inheritCount = 0;
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aProperty) {
if (*p == eCSSProperty__x_system_font ||
nsCSSProps::PropHasFlags(*p, CSS_PROPERTY_DIRECTIONAL_SOURCE)) {
// The system-font subproperty and the *-source properties don't count.
continue;
}
++totalCount;
const nsCSSValue *val = mData->ValueFor(*p);
NS_ABORT_IF_FALSE(!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;
}
}
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 (initialCount != 0 || inheritCount != 0) {
// Case (2): partially initial or inherit.
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 nsCSSProperty* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
NS_ABORT_IF_FALSE(nsCSSProps::GetStringValue(subprops[0]).Find("-top") !=
kNotFound, "first subprop must be top");
NS_ABORT_IF_FALSE(nsCSSProps::GetStringValue(subprops[1]).Find("-right") !=
kNotFound, "second subprop must be right");
NS_ABORT_IF_FALSE(nsCSSProps::GetStringValue(subprops[2]).Find("-bottom") !=
kNotFound, "third subprop must be bottom");
NS_ABORT_IF_FALSE(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])
};
AppendSidesShorthandToString(subprops, vals, aValue);
break;
}
case eCSSProperty_border_radius:
case eCSSProperty__moz_outline_radius: {
const nsCSSProperty* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
const nsCSSValue* vals[4] = {
data->ValueFor(subprops[0]),
data->ValueFor(subprops[1]),
data->ValueFor(subprops[2]),
data->ValueFor(subprops[3])
};
// For compatibility, only write a slash and the y-values
// if they're not identical to the x-values.
bool needY = false;
const nsCSSValue* xVals[4];
const nsCSSValue* yVals[4];
for (int i = 0; i < 4; i++) {
if (vals[i]->GetUnit() == eCSSUnit_Pair) {
needY = true;
xVals[i] = &vals[i]->GetPairValue().mXValue;
yVals[i] = &vals[i]->GetPairValue().mYValue;
} else {
xVals[i] = yVals[i] = vals[i];
}
}
AppendSidesShorthandToString(subprops, xVals, aValue);
if (needY) {
aValue.AppendLiteral(" / ");
AppendSidesShorthandToString(subprops, yVals, 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(PRUnichar(' '));
AppendValueToString(eCSSProperty_border_image_slice, aValue);
if (!widthDefault || !outsetDefault) {
aValue.Append(NS_LITERAL_STRING(" /"));
if (!widthDefault) {
aValue.Append(PRUnichar(' '));
AppendValueToString(eCSSProperty_border_image_width, aValue);
}
if (!outsetDefault) {
aValue.Append(NS_LITERAL_STRING(" / "));
AppendValueToString(eCSSProperty_border_image_outset, aValue);
}
}
}
bool repeatDefault = data->HasDefaultBorderImageRepeat();
if (!repeatDefault) {
aValue.Append(PRUnichar(' '));
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_border_top_colors)->GetUnit() !=
eCSSUnit_None ||
data->ValueFor(eCSSProperty_border_right_colors)->GetUnit() !=
eCSSUnit_None ||
data->ValueFor(eCSSProperty_border_bottom_colors)->GetUnit() !=
eCSSUnit_None ||
data->ValueFor(eCSSProperty_border_left_colors)->GetUnit() !=
eCSSUnit_None) {
break;
}
const nsCSSProperty* subproptables[3] = {
nsCSSProps::SubpropertyEntryFor(eCSSProperty_border_color),
nsCSSProps::SubpropertyEntryFor(eCSSProperty_border_style),
nsCSSProps::SubpropertyEntryFor(eCSSProperty_border_width)
};
bool match = true;
for (const nsCSSProperty** subprops = subproptables,
**subprops_end = ArrayEnd(subproptables);
subprops < subprops_end; ++subprops) {
// Check only the first four subprops in each table, since the
// others are extras for dimensional box properties.
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;
}
case eCSSProperty_border_top:
case eCSSProperty_border_right:
case eCSSProperty_border_bottom:
case eCSSProperty_border_left:
case eCSSProperty_border_start:
case eCSSProperty_border_end:
case eCSSProperty__moz_column_rule:
case eCSSProperty_outline: {
const nsCSSProperty* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
NS_ABORT_IF_FALSE(StringEndsWith(nsCSSProps::GetStringValue(subprops[2]),
NS_LITERAL_CSTRING("-color")) ||
StringEndsWith(nsCSSProps::GetStringValue(subprops[2]),
NS_LITERAL_CSTRING("-color-value")),
"third subprop must be the color property");
const nsCSSValue *colorValue = data->ValueFor(subprops[2]);
bool isMozUseTextColor =
colorValue->GetUnit() == eCSSUnit_Enumerated &&
colorValue->GetIntValue() == NS_STYLE_COLOR_MOZ_USE_TEXT_COLOR;
if (!AppendValueToString(subprops[0], aValue) ||
!(aValue.Append(PRUnichar(' ')),
AppendValueToString(subprops[1], aValue)) ||
// Don't output a third value when it's -moz-use-text-color.
!(isMozUseTextColor ||
(aValue.Append(PRUnichar(' ')),
AppendValueToString(subprops[2], aValue)))) {
aValue.Truncate();
}
break;
}
case eCSSProperty_margin_left:
case eCSSProperty_margin_right:
case eCSSProperty_margin_start:
case eCSSProperty_margin_end:
case eCSSProperty_padding_left:
case eCSSProperty_padding_right:
case eCSSProperty_padding_start:
case eCSSProperty_padding_end:
case eCSSProperty_border_left_color:
case eCSSProperty_border_left_style:
case eCSSProperty_border_left_width:
case eCSSProperty_border_right_color:
case eCSSProperty_border_right_style:
case eCSSProperty_border_right_width:
case eCSSProperty_border_start_color:
case eCSSProperty_border_start_style:
case eCSSProperty_border_start_width:
case eCSSProperty_border_end_color:
case eCSSProperty_border_end_style:
case eCSSProperty_border_end_width: {
const nsCSSProperty* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
NS_ABORT_IF_FALSE(subprops[3] == eCSSProperty_UNKNOWN,
"not box property with physical vs. logical cascading");
AppendValueToString(subprops[0], aValue);
break;
}
case eCSSProperty_background: {
// 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.
// 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.)
const nsCSSValueList *image =
data->ValueFor(eCSSProperty_background_image)->
GetListValue();
const nsCSSValuePairList *repeat =
data->ValueFor(eCSSProperty_background_repeat)->
GetPairListValue();
const nsCSSValueList *attachment =
data->ValueFor(eCSSProperty_background_attachment)->
GetListValue();
const nsCSSValueList *position =
data->ValueFor(eCSSProperty_background_position)->
GetListValue();
const nsCSSValueList *clip =
data->ValueFor(eCSSProperty_background_clip)->
GetListValue();
const nsCSSValueList *origin =
data->ValueFor(eCSSProperty_background_origin)->
GetListValue();
const nsCSSValuePairList *size =
data->ValueFor(eCSSProperty_background_size)->
GetPairListValue();
for (;;) {
image->mValue.AppendToString(eCSSProperty_background_image, aValue);
aValue.Append(PRUnichar(' '));
repeat->mXValue.AppendToString(eCSSProperty_background_repeat, aValue);
if (repeat->mYValue.GetUnit() != eCSSUnit_Null) {
repeat->mYValue.AppendToString(eCSSProperty_background_repeat, aValue);
}
aValue.Append(PRUnichar(' '));
attachment->mValue.AppendToString(eCSSProperty_background_attachment,
aValue);
aValue.Append(PRUnichar(' '));
position->mValue.AppendToString(eCSSProperty_background_position,
aValue);
if (size->mXValue.GetUnit() != eCSSUnit_Auto ||
size->mYValue.GetUnit() != eCSSUnit_Auto) {
aValue.Append(PRUnichar(' '));
aValue.Append(PRUnichar('/'));
aValue.Append(PRUnichar(' '));
size->mXValue.AppendToString(eCSSProperty_background_size, aValue);
aValue.Append(PRUnichar(' '));
size->mYValue.AppendToString(eCSSProperty_background_size, aValue);
}
NS_ABORT_IF_FALSE(clip->mValue.GetUnit() == eCSSUnit_Enumerated &&
origin->mValue.GetUnit() == eCSSUnit_Enumerated,
"should not have inherit/initial within list");
if (clip->mValue.GetIntValue() != NS_STYLE_BG_CLIP_BORDER ||
origin->mValue.GetIntValue() != NS_STYLE_BG_ORIGIN_PADDING) {
MOZ_ASSERT(nsCSSProps::kKeywordTableTable[
eCSSProperty_background_origin] ==
nsCSSProps::kBackgroundOriginKTable);
MOZ_ASSERT(nsCSSProps::kKeywordTableTable[
eCSSProperty_background_clip] ==
nsCSSProps::kBackgroundOriginKTable);
static_assert(NS_STYLE_BG_CLIP_BORDER ==
NS_STYLE_BG_ORIGIN_BORDER &&
NS_STYLE_BG_CLIP_PADDING ==
NS_STYLE_BG_ORIGIN_PADDING &&
NS_STYLE_BG_CLIP_CONTENT ==
NS_STYLE_BG_ORIGIN_CONTENT,
"bg-clip and bg-origin style constants must agree");
aValue.Append(PRUnichar(' '));
origin->mValue.AppendToString(eCSSProperty_background_origin, aValue);
if (clip->mValue != origin->mValue) {
aValue.Append(PRUnichar(' '));
clip->mValue.AppendToString(eCSSProperty_background_clip, aValue);
}
}
image = image->mNext;
repeat = repeat->mNext;
attachment = attachment->mNext;
position = position->mNext;
clip = clip->mNext;
origin = origin->mNext;
size = size->mNext;
if (!image) {
if (repeat || attachment || position || clip || origin || size) {
// Uneven length lists, so can't be serialized as shorthand.
aValue.Truncate();
return;
}
break;
}
if (!repeat || !attachment || !position || !clip || !origin || !size) {
// Uneven length lists, so can't be serialized as shorthand.
aValue.Truncate();
return;
}
aValue.Append(PRUnichar(','));
aValue.Append(PRUnichar(' '));
}
aValue.Append(PRUnichar(' '));
AppendValueToString(eCSSProperty_background_color, aValue);
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 *variant =
data->ValueFor(eCSSProperty_font_variant);
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 *fontSynthesis =
data->ValueFor(eCSSProperty_font_synthesis);
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 font features are not enabled, pointers for fontVariant
// values above may be null since the shorthand check ignores them
// font-variant-alternates enabled ==> layout.css.font-features.enabled is true
bool fontFeaturesEnabled =
nsCSSProps::IsEnabled(eCSSProperty_font_variant_alternates);
if (systemFont &&
systemFont->GetUnit() != eCSSUnit_None &&
systemFont->GetUnit() != eCSSUnit_Null) {
if (style->GetUnit() != eCSSUnit_System_Font ||
variant->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 ||
(fontFeaturesEnabled &&
(fontKerning->GetUnit() != eCSSUnit_System_Font ||
fontSynthesis->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 (stretch->GetUnit() != eCSSUnit_Enumerated ||
stretch->GetIntValue() != NS_STYLE_FONT_STRETCH_NORMAL ||
sizeAdjust->GetUnit() != eCSSUnit_None ||
featureSettings->GetUnit() != eCSSUnit_Normal ||
languageOverride->GetUnit() != eCSSUnit_Normal ||
(fontFeaturesEnabled &&
(fontKerning->GetIntValue() != NS_FONT_KERNING_AUTO ||
fontSynthesis->GetUnit() != eCSSUnit_Enumerated ||
fontSynthesis->GetIntValue() !=
(NS_FONT_SYNTHESIS_WEIGHT | NS_FONT_SYNTHESIS_STYLE) ||
fontVariantAlternates->GetUnit() != eCSSUnit_Normal ||
fontVariantCaps->GetUnit() != eCSSUnit_Normal ||
fontVariantEastAsian->GetUnit() != eCSSUnit_Normal ||
fontVariantLigatures->GetUnit() != eCSSUnit_Normal ||
fontVariantNumeric->GetUnit() != eCSSUnit_Normal ||
fontVariantPosition->GetUnit() != eCSSUnit_Normal))) {
return;
}
if (style->GetUnit() != eCSSUnit_Enumerated ||
style->GetIntValue() != NS_FONT_STYLE_NORMAL) {
style->AppendToString(eCSSProperty_font_style, aValue);
aValue.Append(PRUnichar(' '));
}
if (variant->GetUnit() != eCSSUnit_Enumerated ||
variant->GetIntValue() != NS_FONT_VARIANT_NORMAL) {
variant->AppendToString(eCSSProperty_font_variant, aValue);
aValue.Append(PRUnichar(' '));
}
if (weight->GetUnit() != eCSSUnit_Enumerated ||
weight->GetIntValue() != NS_FONT_WEIGHT_NORMAL) {
weight->AppendToString(eCSSProperty_font_weight, aValue);
aValue.Append(PRUnichar(' '));
}
size->AppendToString(eCSSProperty_font_size, aValue);
if (lh->GetUnit() != eCSSUnit_Normal) {
aValue.Append(PRUnichar('/'));
lh->AppendToString(eCSSProperty_line_height, aValue);
}
aValue.Append(PRUnichar(' '));
family->AppendToString(eCSSProperty_font_family, aValue);
}
break;
}
case eCSSProperty_list_style:
if (AppendValueToString(eCSSProperty_list_style_type, aValue))
aValue.Append(PRUnichar(' '));
if (AppendValueToString(eCSSProperty_list_style_position, aValue))
aValue.Append(PRUnichar(' '));
AppendValueToString(eCSSProperty_list_style_image, 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: {
// If text-decoration-color or text-decoration-style isn't initial value,
// we cannot serialize the text-decoration shorthand value.
const nsCSSValue *decorationColor =
data->ValueFor(eCSSProperty_text_decoration_color);
const nsCSSValue *decorationStyle =
data->ValueFor(eCSSProperty_text_decoration_style);
NS_ABORT_IF_FALSE(decorationStyle->GetUnit() == eCSSUnit_Enumerated,
nsPrintfCString("bad text-decoration-style unit %d",
decorationStyle->GetUnit()).get());
if (decorationColor->GetUnit() != eCSSUnit_Enumerated ||
decorationColor->GetIntValue() != NS_STYLE_COLOR_MOZ_USE_TEXT_COLOR ||
decorationStyle->GetIntValue() !=
NS_STYLE_TEXT_DECORATION_STYLE_SOLID) {
return;
}
AppendValueToString(eCSSProperty_text_decoration_line, 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);
NS_ABORT_IF_FALSE(transDuration->GetUnit() == eCSSUnit_List ||
transDuration->GetUnit() == eCSSUnit_ListDep,
nsPrintfCString("bad t-duration unit %d",
transDuration->GetUnit()).get());
NS_ABORT_IF_FALSE(transTiming->GetUnit() == eCSSUnit_List ||
transTiming->GetUnit() == eCSSUnit_ListDep,
nsPrintfCString("bad t-timing unit %d",
transTiming->GetUnit()).get());
NS_ABORT_IF_FALSE(transDelay->GetUnit() == eCSSUnit_List ||
transDelay->GetUnit() == eCSSUnit_ListDep,
nsPrintfCString("bad t-delay unit %d",
transDelay->GetUnit()).get());
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(PRUnichar(' '));
dur->mValue.AppendToString(eCSSProperty_transition_duration,aValue);
aValue.Append(PRUnichar(' '));
tim->mValue.AppendToString(eCSSProperty_transition_timing_function,
aValue);
aValue.Append(PRUnichar(' '));
del->mValue.AppendToString(eCSSProperty_transition_delay, aValue);
aValue.Append(PRUnichar(' '));
} else {
aValue.Truncate();
}
} else {
NS_ABORT_IF_FALSE(transProp->GetUnit() == eCSSUnit_List ||
transProp->GetUnit() == eCSSUnit_ListDep,
nsPrintfCString("bad t-prop unit %d",
transProp->GetUnit()).get());
const nsCSSValueList* pro = transProp->GetListValue();
for (;;) {
pro->mValue.AppendToString(eCSSProperty_transition_property,
aValue);
aValue.Append(PRUnichar(' '));
dur->mValue.AppendToString(eCSSProperty_transition_duration,
aValue);
aValue.Append(PRUnichar(' '));
tim->mValue.AppendToString(eCSSProperty_transition_timing_function,
aValue);
aValue.Append(PRUnichar(' '));
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 nsCSSProperty* subprops =
nsCSSProps::SubpropertyEntryFor(eCSSProperty_animation);
static const size_t numProps = 7;
NS_ABORT_IF_FALSE(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]);
NS_ABORT_IF_FALSE(values[i]->GetUnit() == eCSSUnit_List ||
values[i]->GetUnit() == eCSSUnit_ListDep,
nsPrintfCString("bad a-duration unit %d",
values[i]->GetUnit()).get());
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.
NS_ABORT_IF_FALSE(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(PRUnichar(' '));
}
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__moz_columns: {
// Two values, column-count and column-width, separated by a space.
const nsCSSProperty* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
AppendValueToString(subprops[0], aValue);
aValue.Append(PRUnichar(' '));
AppendValueToString(subprops[1], aValue);
break;
}
case eCSSProperty_flex: {
// flex-grow, flex-shrink, flex-basis, separated by single space
const nsCSSProperty* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
AppendValueToString(subprops[0], aValue);
aValue.Append(PRUnichar(' '));
AppendValueToString(subprops[1], aValue);
aValue.Append(PRUnichar(' '));
AppendValueToString(subprops[2], aValue);
break;
}
case eCSSProperty__moz_transform: {
// shorthands that are just aliases with different parsing rules
const nsCSSProperty* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
NS_ABORT_IF_FALSE(subprops[1] == eCSSProperty_UNKNOWN,
"must have exactly one subproperty");
AppendValueToString(subprops[0], aValue);
break;
}
default:
NS_ABORT_IF_FALSE(false, "no other shorthands");
break;
}
}
bool
Declaration::GetValueIsImportant(const nsAString& aProperty) const
{
nsCSSProperty propID = nsCSSProps::LookupProperty(aProperty, nsCSSProps::eAny);
if (propID == eCSSProperty_UNKNOWN) {
return false;
}
return GetValueIsImportant(propID);
}
bool
Declaration::GetValueIsImportant(nsCSSProperty 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) {
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(nsCSSProperty aProperty,
nsAutoString& aValue,
nsAString& aResult) const
{
NS_ABORT_IF_FALSE(0 <= aProperty && aProperty < eCSSProperty_COUNT,
"property enum out of range");
NS_ABORT_IF_FALSE((aProperty < eCSSProperty_COUNT_no_shorthands) ==
aValue.IsEmpty(),
"aValue should be given for shorthands but not longhands");
AppendASCIItoUTF16(nsCSSProps::GetStringValue(aProperty), aResult);
aResult.AppendLiteral(": ");
if (aValue.IsEmpty())
AppendValueToString(aProperty, aResult);
else
aResult.Append(aValue);
if (GetValueIsImportant(aProperty)) {
aResult.AppendLiteral(" ! important");
}
aResult.AppendLiteral("; ");
}
void
Declaration::ToString(nsAString& aString) const
{
// Someone cares about this declaration's contents, so don't let it
// change from under them. See e.g. bug 338679.
SetImmutable();
nsCSSCompressedDataBlock *systemFontData =
GetValueIsImportant(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;
nsAutoTArray<nsCSSProperty, 16> shorthandsUsed;
for (index = 0; index < count; index++) {
nsCSSProperty property = OrderValueAt(index);
if (!nsCSSProps::IsEnabled(property)) {
continue;
}
bool doneProperty = false;
// If we already used this property in a shorthand, skip it.
if (shorthandsUsed.Length() > 0) {
for (const nsCSSProperty *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 nsCSSProperty *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.
nsCSSProperty shorthand = *shorthands;
// If GetValue gives us a non-empty string back, we can use that
// value; otherwise it's not possible to use this shorthand.
GetValue(shorthand, value);
if (!value.IsEmpty()) {
AppendPropertyAndValueToString(shorthand, value, aString);
shorthandsUsed.AppendElement(shorthand);
doneProperty = true;
break;
}
NS_ABORT_IF_FALSE(shorthand != eCSSProperty_font ||
*(shorthands + 1) == eCSSProperty_UNKNOWN,
"font should always be the only containing shorthand");
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);
AppendPropertyAndValueToString(eCSSProperty_font, value, aString);
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;
}
}
}
if (doneProperty)
continue;
NS_ABORT_IF_FALSE(value.IsEmpty(), "value should be empty now");
AppendPropertyAndValueToString(property, value, aString);
}
if (! aString.IsEmpty()) {
// if the string is not empty, we have trailing whitespace we
// should remove
aString.Truncate(aString.Length() - 1);
}
}
#ifdef DEBUG
void
Declaration::List(FILE* out, int32_t aIndent) const
{
for (int32_t index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("{ ", out);
nsAutoString s;
ToString(s);
fputs(NS_ConvertUTF16toUTF8(s).get(), out);
fputs("}", out);
}
#endif
bool
Declaration::GetNthProperty(uint32_t aIndex, nsAString& aReturn) const
{
aReturn.Truncate();
if (aIndex < mOrder.Length()) {
nsCSSProperty property = OrderValueAt(aIndex);
if (0 <= property) {
AppendASCIItoUTF16(nsCSSProps::GetStringValue(property), aReturn);
return true;
}
}
return false;
}
void
Declaration::InitializeEmpty()
{
NS_ABORT_IF_FALSE(!mData && !mImportantData, "already initialized");
mData = nsCSSCompressedDataBlock::CreateEmptyBlock();
}
Declaration*
Declaration::EnsureMutable()
{
NS_ABORT_IF_FALSE(mData, "should only be called when not expanded");
if (!IsMutable()) {
return new Declaration(*this);
} else {
return this;
}
}
size_t
Declaration::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
n += mOrder.SizeOfExcludingThis(aMallocSizeOf);
n += mData ? mData ->SizeOfIncludingThis(aMallocSizeOf) : 0;
n += mImportantData ? mImportantData->SizeOfIncludingThis(aMallocSizeOf) : 0;
return n;
}
} // namespace mozilla::css
} // namespace mozilla
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