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gecko-dev/layout/style/nsCSSDeclaration.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Daniel Glazman <glazman@netscape.com>
* Mats Palmgren <mats.palmgren@bredband.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* representation of a declaration block (or style attribute) in a CSS
* stylesheet
*/
#include "nscore.h"
#include "prlog.h"
#include "nsCSSDeclaration.h"
#include "nsString.h"
#include "nsIAtom.h"
#include "nsUnicharUtils.h"
#include "nsReadableUtils.h"
#include "nsCRT.h"
#include "nsCSSProps.h"
#include "nsFont.h"
#include "nsReadableUtils.h"
#include "nsStyleUtil.h"
#include "nsStyleConsts.h"
#include "nsCOMPtr.h"
nsCSSDeclaration::nsCSSDeclaration()
: mData(nsnull),
mImportantData(nsnull)
{
// check that we can fit all the CSS properties into a PRUint8
// for the mOrder array - if not, might need to use PRUint16!
PR_STATIC_ASSERT(eCSSProperty_COUNT_no_shorthands - 1 <= PR_UINT8_MAX);
MOZ_COUNT_CTOR(nsCSSDeclaration);
}
nsCSSDeclaration::nsCSSDeclaration(const nsCSSDeclaration& aCopy)
: mOrder(aCopy.mOrder),
mData(aCopy.mData ? aCopy.mData->Clone() : nsnull),
mImportantData(aCopy.mImportantData ? aCopy.mImportantData->Clone()
: nsnull)
{
MOZ_COUNT_CTOR(nsCSSDeclaration);
}
nsCSSDeclaration::~nsCSSDeclaration(void)
{
if (mData) {
mData->Destroy();
}
if (mImportantData) {
mImportantData->Destroy();
}
MOZ_COUNT_DTOR(nsCSSDeclaration);
}
nsresult
nsCSSDeclaration::ValueAppended(nsCSSProperty aProperty)
{
// order IS important for CSS, so remove and add to the end
if (nsCSSProps::IsShorthand(aProperty)) {
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aProperty) {
mOrder.RemoveElement(*p);
mOrder.AppendElement(*p);
}
} else {
mOrder.RemoveElement(aProperty);
mOrder.AppendElement(aProperty);
}
return NS_OK;
}
nsresult
nsCSSDeclaration::RemoveProperty(nsCSSProperty aProperty)
{
nsCSSExpandedDataBlock data;
data.Expand(&mData, &mImportantData);
NS_ASSERTION(!mData && !mImportantData, "Expand didn't null things out");
if (nsCSSProps::IsShorthand(aProperty)) {
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aProperty) {
data.ClearProperty(*p);
mOrder.RemoveElement(*p);
}
} else {
data.ClearProperty(aProperty);
mOrder.RemoveElement(aProperty);
}
data.Compress(&mData, &mImportantData);
return NS_OK;
}
nsresult
nsCSSDeclaration::AppendComment(const nsAString& aComment)
{
return /* NS_ERROR_NOT_IMPLEMENTED, or not any longer that is */ NS_OK;
}
PRBool nsCSSDeclaration::AppendValueToString(nsCSSProperty aProperty, nsAString& aResult) const
{
nsCSSCompressedDataBlock *data = GetValueIsImportant(aProperty)
? mImportantData : mData;
const void *storage = data->StorageFor(aProperty);
if (storage) {
switch (nsCSSProps::kTypeTable[aProperty]) {
case eCSSType_Value: {
const nsCSSValue *val = static_cast<const nsCSSValue*>(storage);
AppendCSSValueToString(aProperty, *val, aResult);
} break;
case eCSSType_Rect: {
const nsCSSRect *rect = static_cast<const nsCSSRect*>(storage);
const nsCSSUnit topUnit = rect->mTop.GetUnit();
if (topUnit == eCSSUnit_Inherit ||
topUnit == eCSSUnit_Initial ||
topUnit == eCSSUnit_RectIsAuto) {
NS_ASSERTION(rect->mRight.GetUnit() == topUnit &&
rect->mBottom.GetUnit() == topUnit &&
rect->mLeft.GetUnit() == topUnit,
"parser should make all sides have the same unit");
if (topUnit == eCSSUnit_RectIsAuto)
aResult.AppendLiteral("auto");
else
AppendCSSValueToString(aProperty, rect->mTop, aResult);
} else {
aResult.AppendLiteral("rect(");
AppendCSSValueToString(aProperty, rect->mTop, aResult);
NS_NAMED_LITERAL_STRING(comma, ", ");
aResult.Append(comma);
AppendCSSValueToString(aProperty, rect->mRight, aResult);
aResult.Append(comma);
AppendCSSValueToString(aProperty, rect->mBottom, aResult);
aResult.Append(comma);
AppendCSSValueToString(aProperty, rect->mLeft, aResult);
aResult.Append(PRUnichar(')'));
}
} break;
case eCSSType_ValuePair: {
const nsCSSValuePair *pair = static_cast<const nsCSSValuePair*>(storage);
AppendCSSValueToString(aProperty, pair->mXValue, aResult);
if (pair->mYValue != pair->mXValue ||
((aProperty == eCSSProperty_background_position ||
aProperty == eCSSProperty__moz_transform_origin) &&
pair->mXValue.GetUnit() != eCSSUnit_Inherit &&
pair->mXValue.GetUnit() != eCSSUnit_Initial)) {
// Only output a Y value if it's different from the X value
// or if it's a background-position value other than 'initial'
// or 'inherit' or if it's a -moz-transform-origin value other
// than 'initial' or 'inherit'.
aResult.Append(PRUnichar(' '));
AppendCSSValueToString(aProperty, pair->mYValue, aResult);
}
} break;
case eCSSType_ValueList: {
const nsCSSValueList* val =
*static_cast<nsCSSValueList*const*>(storage);
do {
AppendCSSValueToString(aProperty, val->mValue, aResult);
val = val->mNext;
if (val) {
if (nsCSSProps::PropHasFlags(aProperty,
CSS_PROPERTY_VALUE_LIST_USES_COMMAS))
aResult.Append(PRUnichar(','));
aResult.Append(PRUnichar(' '));
}
} while (val);
} break;
case eCSSType_ValuePairList: {
const nsCSSValuePairList* item =
*static_cast<nsCSSValuePairList*const*>(storage);
do {
NS_ASSERTION(item->mXValue.GetUnit() != eCSSUnit_Null,
"unexpected null unit");
AppendCSSValueToString(aProperty, item->mXValue, aResult);
if (item->mXValue.GetUnit() != eCSSUnit_Inherit &&
item->mXValue.GetUnit() != eCSSUnit_Initial &&
item->mYValue.GetUnit() != eCSSUnit_Null) {
aResult.Append(PRUnichar(' '));
AppendCSSValueToString(aProperty, item->mYValue, aResult);
}
item = item->mNext;
if (item) {
if (nsCSSProps::PropHasFlags(aProperty,
CSS_PROPERTY_VALUE_LIST_USES_COMMAS))
aResult.Append(PRUnichar(','));
aResult.Append(PRUnichar(' '));
}
} while (item);
} break;
}
}
return storage != nsnull;
}
/* static */ PRBool
nsCSSDeclaration::AppendCSSValueToString(nsCSSProperty aProperty,
const nsCSSValue& aValue,
nsAString& aResult)
{
nsCSSUnit unit = aValue.GetUnit();
if (eCSSUnit_Null == unit) {
return PR_FALSE;
}
if (eCSSUnit_String <= unit && unit <= eCSSUnit_Attr) {
if (unit == eCSSUnit_Attr) {
aResult.AppendLiteral("attr(");
}
nsAutoString buffer;
aValue.GetStringValue(buffer);
aResult.Append(buffer);
}
else if (eCSSUnit_Array <= unit && unit <= eCSSUnit_Counters) {
switch (unit) {
case eCSSUnit_Counter: aResult.AppendLiteral("counter("); break;
case eCSSUnit_Counters: aResult.AppendLiteral("counters("); break;
default: break;
}
nsCSSValue::Array *array = aValue.GetArrayValue();
PRBool mark = PR_FALSE;
for (PRUint16 i = 0, i_end = array->Count(); i < i_end; ++i) {
if (aProperty == eCSSProperty_border_image && i >= 5) {
if (array->Item(i).GetUnit() == eCSSUnit_Null) {
continue;
}
if (i == 5) {
aResult.AppendLiteral(" /");
}
}
if (mark && array->Item(i).GetUnit() != eCSSUnit_Null) {
if (unit == eCSSUnit_Array)
aResult.AppendLiteral(" ");
else
aResult.AppendLiteral(", ");
}
nsCSSProperty prop =
((eCSSUnit_Counter <= unit && unit <= eCSSUnit_Counters) &&
i == array->Count() - 1)
? eCSSProperty_list_style_type : aProperty;
if (AppendCSSValueToString(prop, array->Item(i), aResult)) {
mark = PR_TRUE;
}
}
}
/* Although Function is backed by an Array, we'll handle it separately
* because it's a bit quirky.
*/
else if (eCSSUnit_Function == unit) {
const nsCSSValue::Array* array = aValue.GetArrayValue();
NS_ASSERTION(array->Count() >= 1, "Functions must have at least one element for the name.");
/* Append the function name. */
AppendCSSValueToString(aProperty, array->Item(0), aResult);
aResult.AppendLiteral("(");
/* Now, step through the function contents, writing each of them as we go. */
for (PRUint16 index = 1; index < array->Count(); ++index) {
AppendCSSValueToString(aProperty, array->Item(index), aResult);
/* If we're not at the final element, append a comma. */
if (index + 1 != array->Count())
aResult.AppendLiteral(", ");
}
/* Finally, append the closing parenthesis. */
aResult.AppendLiteral(")");
}
else if (eCSSUnit_Integer == unit) {
nsAutoString tmpStr;
tmpStr.AppendInt(aValue.GetIntValue(), 10);
aResult.Append(tmpStr);
}
else if (eCSSUnit_Enumerated == unit) {
if (eCSSProperty_text_decoration == aProperty) {
PRInt32 intValue = aValue.GetIntValue();
if (NS_STYLE_TEXT_DECORATION_NONE != intValue) {
PRInt32 mask;
for (mask = NS_STYLE_TEXT_DECORATION_UNDERLINE;
mask <= NS_STYLE_TEXT_DECORATION_BLINK;
mask <<= 1) {
if ((mask & intValue) == mask) {
AppendASCIItoUTF16(nsCSSProps::LookupPropertyValue(aProperty, mask), aResult);
intValue &= ~mask;
if (0 != intValue) { // more left
aResult.Append(PRUnichar(' '));
}
}
}
}
else {
AppendASCIItoUTF16(nsCSSProps::LookupPropertyValue(aProperty, NS_STYLE_TEXT_DECORATION_NONE), aResult);
}
}
else if (eCSSProperty_azimuth == aProperty) {
PRInt32 intValue = aValue.GetIntValue();
AppendASCIItoUTF16(nsCSSProps::LookupPropertyValue(aProperty, (intValue & ~NS_STYLE_AZIMUTH_BEHIND)), aResult);
if ((NS_STYLE_AZIMUTH_BEHIND & intValue) != 0) {
aResult.Append(PRUnichar(' '));
AppendASCIItoUTF16(nsCSSProps::LookupPropertyValue(aProperty, NS_STYLE_AZIMUTH_BEHIND), aResult);
}
}
else if (eCSSProperty_marks == aProperty) {
PRInt32 intValue = aValue.GetIntValue();
if ((NS_STYLE_PAGE_MARKS_CROP & intValue) != 0) {
AppendASCIItoUTF16(nsCSSProps::LookupPropertyValue(aProperty, NS_STYLE_PAGE_MARKS_CROP), aResult);
}
if ((NS_STYLE_PAGE_MARKS_REGISTER & intValue) != 0) {
if ((NS_STYLE_PAGE_MARKS_CROP & intValue) != 0) {
aResult.Append(PRUnichar(' '));
}
AppendASCIItoUTF16(nsCSSProps::LookupPropertyValue(aProperty, NS_STYLE_PAGE_MARKS_REGISTER), aResult);
}
}
else {
const nsAFlatCString& name = nsCSSProps::LookupPropertyValue(aProperty, aValue.GetIntValue());
AppendASCIItoUTF16(name, aResult);
}
}
else if (eCSSUnit_EnumColor == unit) {
// we can lookup the property in the ColorTable and then
// get a string mapping the name
nsCAutoString str;
if (nsCSSProps::GetColorName(aValue.GetIntValue(), str)){
AppendASCIItoUTF16(str, aResult);
} else {
NS_NOTREACHED("bad color value");
}
}
else if (eCSSUnit_Color == unit) {
nscolor color = aValue.GetColorValue();
if (color == NS_RGBA(0, 0, 0, 0)) {
// Use the strictest match for 'transparent' so we do correct
// round-tripping of all other rgba() values.
aResult.AppendLiteral("transparent");
} else {
nsAutoString tmpStr;
PRUint8 a = NS_GET_A(color);
if (a < 255) {
tmpStr.AppendLiteral("rgba(");
} else {
tmpStr.AppendLiteral("rgb(");
}
NS_NAMED_LITERAL_STRING(comma, ", ");
tmpStr.AppendInt(NS_GET_R(color), 10);
tmpStr.Append(comma);
tmpStr.AppendInt(NS_GET_G(color), 10);
tmpStr.Append(comma);
tmpStr.AppendInt(NS_GET_B(color), 10);
if (a < 255) {
tmpStr.Append(comma);
tmpStr.AppendFloat(nsStyleUtil::ColorComponentToFloat(a));
}
tmpStr.Append(PRUnichar(')'));
aResult.Append(tmpStr);
}
}
else if (eCSSUnit_URL == unit || eCSSUnit_Image == unit) {
aResult.Append(NS_LITERAL_STRING("url(") +
nsDependentString(aValue.GetOriginalURLValue()) +
NS_LITERAL_STRING(")"));
}
else if (eCSSUnit_Percent == unit) {
nsAutoString tmpStr;
tmpStr.AppendFloat(aValue.GetPercentValue() * 100.0f);
aResult.Append(tmpStr);
}
else if (eCSSUnit_Percent < unit) { // length unit
nsAutoString tmpStr;
tmpStr.AppendFloat(aValue.GetFloatValue());
aResult.Append(tmpStr);
}
switch (unit) {
case eCSSUnit_Null: break;
case eCSSUnit_Auto: aResult.AppendLiteral("auto"); break;
case eCSSUnit_Inherit: aResult.AppendLiteral("inherit"); break;
case eCSSUnit_Initial: aResult.AppendLiteral("-moz-initial"); break;
case eCSSUnit_None: aResult.AppendLiteral("none"); break;
case eCSSUnit_Normal: aResult.AppendLiteral("normal"); break;
case eCSSUnit_System_Font: aResult.AppendLiteral("-moz-use-system-font"); break;
case eCSSUnit_Dummy:
case eCSSUnit_DummyInherit:
case eCSSUnit_RectIsAuto:
NS_NOTREACHED("should never serialize");
break;
case eCSSUnit_String: break;
case eCSSUnit_URL: break;
case eCSSUnit_Image: break;
case eCSSUnit_Array: break;
case eCSSUnit_Attr:
case eCSSUnit_Counter:
case eCSSUnit_Counters: aResult.Append(PRUnichar(')')); break;
case eCSSUnit_Local_Font: break;
case eCSSUnit_Font_Format: break;
case eCSSUnit_Function: break;
case eCSSUnit_Integer: break;
case eCSSUnit_Enumerated: break;
case eCSSUnit_EnumColor: break;
case eCSSUnit_Color: break;
case eCSSUnit_Percent: aResult.Append(PRUnichar('%')); break;
case eCSSUnit_Number: break;
case eCSSUnit_Inch: aResult.AppendLiteral("in"); break;
case eCSSUnit_Foot: aResult.AppendLiteral("ft"); break;
case eCSSUnit_Mile: aResult.AppendLiteral("mi"); break;
case eCSSUnit_Millimeter: aResult.AppendLiteral("mm"); break;
case eCSSUnit_Centimeter: aResult.AppendLiteral("cm"); break;
case eCSSUnit_Meter: aResult.AppendLiteral("m"); break;
case eCSSUnit_Kilometer: aResult.AppendLiteral("km"); break;
case eCSSUnit_Point: aResult.AppendLiteral("pt"); break;
case eCSSUnit_Pica: aResult.AppendLiteral("pc"); break;
case eCSSUnit_Didot: aResult.AppendLiteral("dt"); break;
case eCSSUnit_Cicero: aResult.AppendLiteral("cc"); break;
case eCSSUnit_EM: aResult.AppendLiteral("em"); break;
case eCSSUnit_XHeight: aResult.AppendLiteral("ex"); break;
case eCSSUnit_Char: aResult.AppendLiteral("ch"); break;
case eCSSUnit_RootEM: aResult.AppendLiteral("rem"); break;
case eCSSUnit_Pixel: aResult.AppendLiteral("px"); break;
case eCSSUnit_Degree: aResult.AppendLiteral("deg"); break;
case eCSSUnit_Grad: aResult.AppendLiteral("grad"); break;
case eCSSUnit_Radian: aResult.AppendLiteral("rad"); break;
case eCSSUnit_Hertz: aResult.AppendLiteral("Hz"); break;
case eCSSUnit_Kilohertz: aResult.AppendLiteral("kHz"); break;
case eCSSUnit_Seconds: aResult.Append(PRUnichar('s')); break;
case eCSSUnit_Milliseconds: aResult.AppendLiteral("ms"); break;
}
return PR_TRUE;
}
nsresult
nsCSSDeclaration::GetValue(nsCSSProperty aProperty,
nsAString& aValue) const
{
aValue.Truncate(0);
// simple properties are easy.
if (!nsCSSProps::IsShorthand(aProperty)) {
AppendValueToString(aProperty, aValue);
return NS_OK;
}
// 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.
PRUint32 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 void *storage = mData->StorageFor(*p);
NS_ASSERTION(!storage || !mImportantData || !mImportantData->StorageFor(*p),
"can't be in both blocks");
if (!storage && mImportantData) {
++importantCount;
storage = mImportantData->StorageFor(*p);
}
if (!storage) {
// Case (1) above: some subproperties not specified.
return NS_OK;
}
nsCSSUnit unit;
switch (nsCSSProps::kTypeTable[*p]) {
case eCSSType_Value: {
const nsCSSValue *val = static_cast<const nsCSSValue*>(storage);
unit = val->GetUnit();
} break;
case eCSSType_Rect: {
const nsCSSRect *rect = static_cast<const nsCSSRect*>(storage);
unit = rect->mTop.GetUnit();
} break;
case eCSSType_ValuePair: {
const nsCSSValuePair *pair = static_cast<const nsCSSValuePair*>(storage);
unit = pair->mXValue.GetUnit();
} break;
case eCSSType_ValueList: {
const nsCSSValueList* item =
*static_cast<nsCSSValueList*const*>(storage);
if (item) {
unit = item->mValue.GetUnit();
} else {
unit = eCSSUnit_Null;
}
} break;
case eCSSType_ValuePairList: {
const nsCSSValuePairList* item =
*static_cast<nsCSSValuePairList*const*>(storage);
if (item) {
unit = item->mXValue.GetUnit();
} else {
unit = eCSSUnit_Null;
}
} break;
}
if (unit == eCSSUnit_Inherit) {
++inheritCount;
} else if (unit == eCSSUnit_Initial) {
++initialCount;
}
}
if (importantCount != 0 && importantCount != totalCount) {
// Case (3), no consistent importance.
return NS_OK;
}
if (initialCount == totalCount) {
// Simplify serialization below by serializing initial up-front.
AppendCSSValueToString(eCSSProperty_UNKNOWN, nsCSSValue(eCSSUnit_Initial),
aValue);
return NS_OK;
}
if (inheritCount == totalCount) {
// Simplify serialization below by serializing inherit up-front.
AppendCSSValueToString(eCSSProperty_UNKNOWN, nsCSSValue(eCSSUnit_Inherit),
aValue);
return NS_OK;
}
if (initialCount != 0 || inheritCount != 0) {
// Case (2): partially initial or inherit.
return NS_OK;
}
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_ASSERTION(nsCSSProps::kTypeTable[subprops[0]] == eCSSType_Value &&
nsCSSProps::kTypeTable[subprops[1]] == eCSSType_Value &&
nsCSSProps::kTypeTable[subprops[2]] == eCSSType_Value &&
nsCSSProps::kTypeTable[subprops[3]] == eCSSType_Value,
"type mismatch");
NS_ASSERTION(nsCSSProps::GetStringValue(subprops[0]).Find("-top") !=
kNotFound, "first subprop must be top");
NS_ASSERTION(nsCSSProps::GetStringValue(subprops[1]).Find("-right") !=
kNotFound, "second subprop must be right");
NS_ASSERTION(nsCSSProps::GetStringValue(subprops[2]).Find("-bottom") !=
kNotFound, "third subprop must be bottom");
NS_ASSERTION(nsCSSProps::GetStringValue(subprops[3]).Find("-left") !=
kNotFound, "fourth subprop must be left");
const nsCSSValue &topValue = *data->ValueStorageFor(subprops[0]);
const nsCSSValue &rightValue = *data->ValueStorageFor(subprops[1]);
const nsCSSValue &bottomValue = *data->ValueStorageFor(subprops[2]);
const nsCSSValue &leftValue = *data->ValueStorageFor(subprops[3]);
PRBool haveValue;
haveValue = AppendCSSValueToString(subprops[0], topValue, aValue);
NS_ASSERTION(haveValue, "should have bailed before");
if (topValue != rightValue || topValue != leftValue ||
topValue != bottomValue) {
aValue.Append(PRUnichar(' '));
haveValue = AppendCSSValueToString(subprops[1], rightValue, aValue);
NS_ASSERTION(haveValue, "should have bailed before");
if (topValue != bottomValue || rightValue != leftValue) {
aValue.Append(PRUnichar(' '));
haveValue = AppendCSSValueToString(subprops[2], bottomValue, aValue);
NS_ASSERTION(haveValue, "should have bailed before");
if (rightValue != leftValue) {
aValue.Append(PRUnichar(' '));
haveValue = AppendCSSValueToString(subprops[3], leftValue, aValue);
NS_ASSERTION(haveValue, "should have bailed before");
}
}
}
break;
}
case eCSSProperty__moz_border_radius:
case eCSSProperty__moz_outline_radius: {
const nsCSSProperty* subprops =
nsCSSProps::SubpropertyEntryFor(aProperty);
NS_ASSERTION(nsCSSProps::kTypeTable[subprops[0]] == eCSSType_ValuePair &&
nsCSSProps::kTypeTable[subprops[1]] == eCSSType_ValuePair &&
nsCSSProps::kTypeTable[subprops[2]] == eCSSType_ValuePair &&
nsCSSProps::kTypeTable[subprops[3]] == eCSSType_ValuePair,
"type mismatch");
const nsCSSValuePair* vals[4] = {
data->ValuePairStorageFor(subprops[0]),
data->ValuePairStorageFor(subprops[1]),
data->ValuePairStorageFor(subprops[2]),
data->ValuePairStorageFor(subprops[3])
};
AppendCSSValueToString(aProperty, vals[0]->mXValue, aValue);
aValue.Append(PRUnichar(' '));
AppendCSSValueToString(aProperty, vals[1]->mXValue, aValue);
aValue.Append(PRUnichar(' '));
AppendCSSValueToString(aProperty, vals[2]->mXValue, aValue);
aValue.Append(PRUnichar(' '));
AppendCSSValueToString(aProperty, vals[3]->mXValue, aValue);
// For compatibility, only write a slash and the y-values
// if they're not identical to the x-values.
if (vals[0]->mXValue != vals[0]->mYValue ||
vals[1]->mXValue != vals[1]->mYValue ||
vals[2]->mXValue != vals[2]->mYValue ||
vals[3]->mXValue != vals[3]->mYValue) {
aValue.AppendLiteral(" / ");
AppendCSSValueToString(aProperty, vals[0]->mYValue, aValue);
aValue.Append(PRUnichar(' '));
AppendCSSValueToString(aProperty, vals[1]->mYValue, aValue);
aValue.Append(PRUnichar(' '));
AppendCSSValueToString(aProperty, vals[2]->mYValue, aValue);
aValue.Append(PRUnichar(' '));
AppendCSSValueToString(aProperty, vals[3]->mYValue, aValue);
}
break;
}
case eCSSProperty_border: {
const nsCSSProperty* subproptables[3] = {
nsCSSProps::SubpropertyEntryFor(eCSSProperty_border_color),
nsCSSProps::SubpropertyEntryFor(eCSSProperty_border_style),
nsCSSProps::SubpropertyEntryFor(eCSSProperty_border_width)
};
PRBool match = PR_TRUE;
for (const nsCSSProperty** subprops = subproptables,
**subprops_end = subproptables + NS_ARRAY_LENGTH(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->ValueStorageFor((*subprops)[0]);
for (PRInt32 side = 1; side < 4; ++side) {
const nsCSSValue *otherSide =
data->ValueStorageFor((*subprops)[side]);
if (*firstSide != *otherSide)
match = PR_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_ASSERTION(nsCSSProps::kTypeTable[subprops[0]] == eCSSType_Value &&
nsCSSProps::kTypeTable[subprops[1]] == eCSSType_Value &&
nsCSSProps::kTypeTable[subprops[2]] == eCSSType_Value,
"type mismatch");
NS_ASSERTION(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->ValueStorageFor(subprops[2]);
PRBool 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_ASSERTION(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->ValueListStorageFor(eCSSProperty_background_image);
const nsCSSValueList *repeat =
* data->ValueListStorageFor(eCSSProperty_background_repeat);
const nsCSSValueList *attachment =
* data->ValueListStorageFor(eCSSProperty_background_attachment);
const nsCSSValuePairList *position =
* data->ValuePairListStorageFor(eCSSProperty_background_position);
const nsCSSValueList *clip =
* data->ValueListStorageFor(eCSSProperty__moz_background_clip);
const nsCSSValueList *origin =
* data->ValueListStorageFor(eCSSProperty__moz_background_origin);
for (;;) {
AppendCSSValueToString(eCSSProperty_background_image,
image->mValue, aValue);
aValue.Append(PRUnichar(' '));
AppendCSSValueToString(eCSSProperty_background_repeat,
repeat->mValue, aValue);
aValue.Append(PRUnichar(' '));
AppendCSSValueToString(eCSSProperty_background_attachment,
attachment->mValue, aValue);
aValue.Append(PRUnichar(' '));
AppendCSSValueToString(eCSSProperty_background_position,
position->mXValue, aValue);
aValue.Append(PRUnichar(' '));
AppendCSSValueToString(eCSSProperty_background_position,
position->mYValue, aValue);
NS_ASSERTION(clip->mValue.GetUnit() == eCSSUnit_Enumerated &&
origin->mValue.GetUnit() == eCSSUnit_Enumerated,
"should not be inherit/initial within list and "
"should have returned early for real inherit/initial");
if (clip->mValue.GetIntValue() != NS_STYLE_BG_CLIP_BORDER ||
origin->mValue.GetIntValue() != NS_STYLE_BG_ORIGIN_PADDING) {
#if 0
// This is commented out for now until we change
// -moz-background-clip to background-clip, -moz-background-origin
// to background-origin, change their value names to *-box, and add
// support for content-box on background-clip.
PR_STATIC_ASSERT(NS_STYLE_BG_CLIP_BORDER ==
NS_STYLE_BG_ORIGIN_BORDER);
PR_STATIC_ASSERT(NS_STYLE_BG_CLIP_PADDING ==
NS_STYLE_BG_ORIGIN_PADDING);
// PR_STATIC_ASSERT(NS_STYLE_BG_CLIP_CONTENT == /* does not exist */
// NS_STYLE_BG_ORIGIN_CONTENT);
if (clip->mValue != origin->mValue) {
aValue.Truncate();
return NS_OK;
}
aValue.Append(PRUnichar(' '));
AppendCSSValueToString(eCSSProperty__moz_background_clip,
clip->mValue, aValue);
#else
aValue.Truncate();
return NS_OK;
#endif
}
image = image->mNext;
repeat = repeat->mNext;
attachment = attachment->mNext;
position = position->mNext;
clip = clip->mNext;
origin = origin->mNext;
if (!image) {
if (repeat || attachment || position || clip || origin) {
// Uneven length lists, so can't be serialized as shorthand.
aValue.Truncate();
return NS_OK;
}
break;
}
if (!repeat || !attachment || !position || !clip || !origin) {
// Uneven length lists, so can't be serialized as shorthand.
aValue.Truncate();
return NS_OK;
}
aValue.Append(PRUnichar(','));
aValue.Append(PRUnichar(' '));
}
aValue.Append(PRUnichar(' '));
AppendValueToString(eCSSProperty_background_color, aValue);
break;
}
case eCSSProperty_cue: {
if (AppendValueToString(eCSSProperty_cue_before, aValue)) {
aValue.Append(PRUnichar(' '));
if (!AppendValueToString(eCSSProperty_cue_after, aValue))
aValue.Truncate();
}
break;
}
case eCSSProperty_font: {
// systemFont might not be present; the others are guaranteed to be
// based on the shorthand check at the beginning of the function
const nsCSSValue *systemFont =
data->ValueStorageFor(eCSSProperty__x_system_font);
const nsCSSValue &style =
*data->ValueStorageFor(eCSSProperty_font_style);
const nsCSSValue &variant =
*data->ValueStorageFor(eCSSProperty_font_variant);
const nsCSSValue &weight =
*data->ValueStorageFor(eCSSProperty_font_weight);
const nsCSSValue &size =
*data->ValueStorageFor(eCSSProperty_font_size);
const nsCSSValue &lh =
*data->ValueStorageFor(eCSSProperty_line_height);
const nsCSSValue &family =
*data->ValueStorageFor(eCSSProperty_font_family);
const nsCSSValue &stretch =
*data->ValueStorageFor(eCSSProperty_font_stretch);
const nsCSSValue &sizeAdjust =
*data->ValueStorageFor(eCSSProperty_font_size_adjust);
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) {
// This can't be represented as a shorthand.
return NS_OK;
}
AppendCSSValueToString(eCSSProperty__x_system_font, *systemFont,
aValue);
} else {
// The font-stretch and font-size-adjust
// properties are reset by this shorthand property to their
// initial values, but can't be represented in its syntax.
if (stretch != nsCSSValue(eCSSUnit_Normal) ||
sizeAdjust != nsCSSValue(eCSSUnit_None)) {
return NS_OK;
}
if (style.GetUnit() != eCSSUnit_Normal) {
AppendCSSValueToString(eCSSProperty_font_style, style, aValue);
aValue.Append(PRUnichar(' '));
}
if (variant.GetUnit() != eCSSUnit_Normal) {
AppendCSSValueToString(eCSSProperty_font_variant, variant, aValue);
aValue.Append(PRUnichar(' '));
}
if (weight.GetUnit() != eCSSUnit_Normal) {
AppendCSSValueToString(eCSSProperty_font_weight, weight, aValue);
aValue.Append(PRUnichar(' '));
}
AppendCSSValueToString(eCSSProperty_font_size, size, aValue);
if (lh.GetUnit() != eCSSUnit_Normal) {
aValue.Append(PRUnichar('/'));
AppendCSSValueToString(eCSSProperty_line_height, lh, aValue);
}
aValue.Append(PRUnichar(' '));
AppendCSSValueToString(eCSSProperty_font_family, 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->ValueStorageFor(eCSSProperty_overflow_x);
const nsCSSValue &yValue =
*data->ValueStorageFor(eCSSProperty_overflow_y);
if (xValue == yValue)
AppendCSSValueToString(eCSSProperty_overflow_x, xValue, aValue);
break;
}
case eCSSProperty_pause: {
if (AppendValueToString(eCSSProperty_pause_before, aValue)) {
aValue.Append(PRUnichar(' '));
if (!AppendValueToString(eCSSProperty_pause_after, aValue))
aValue.Truncate();
}
break;
}
#ifdef MOZ_SVG
case eCSSProperty_marker: {
const nsCSSValue &endValue =
*data->ValueStorageFor(eCSSProperty_marker_end);
const nsCSSValue &midValue =
*data->ValueStorageFor(eCSSProperty_marker_mid);
const nsCSSValue &startValue =
*data->ValueStorageFor(eCSSProperty_marker_start);
if (endValue == midValue && midValue == startValue)
AppendValueToString(eCSSProperty_marker_end, aValue);
break;
}
#endif
default:
NS_NOTREACHED("no other shorthands");
break;
}
return NS_OK;
}
PRBool
nsCSSDeclaration::GetValueIsImportant(const nsAString& aProperty) const
{
nsCSSProperty propID = nsCSSProps::LookupProperty(aProperty);
return GetValueIsImportant(propID);
}
PRBool
nsCSSDeclaration::GetValueIsImportant(nsCSSProperty aProperty) const
{
if (!mImportantData)
return PR_FALSE;
// Calling StorageFor is inefficient, but we can assume '!important'
// is rare.
if (nsCSSProps::IsShorthand(aProperty)) {
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aProperty) {
if (*p == eCSSProperty__x_system_font) {
// The system_font subproperty doesn't count.
continue;
}
if (!mImportantData->StorageFor(*p)) {
return PR_FALSE;
}
}
return PR_TRUE;
}
return mImportantData->StorageFor(aProperty) != nsnull;
}
/* static */ void
nsCSSDeclaration::AppendImportanceToString(PRBool aIsImportant,
nsAString& aString)
{
if (aIsImportant) {
aString.AppendLiteral(" ! important");
}
}
void
nsCSSDeclaration::AppendPropertyAndValueToString(nsCSSProperty aProperty,
nsAutoString& aValue,
nsAString& aResult) const
{
NS_ASSERTION(0 <= aProperty && aProperty < eCSSProperty_COUNT,
"property enum out of range");
NS_ASSERTION((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);
PRBool isImportant = GetValueIsImportant(aProperty);
AppendImportanceToString(isImportant, aResult);
aResult.AppendLiteral("; ");
}
nsresult
nsCSSDeclaration::ToString(nsAString& aString) const
{
nsCSSCompressedDataBlock *systemFontData =
GetValueIsImportant(eCSSProperty__x_system_font) ? mImportantData : mData;
const nsCSSValue *systemFont =
systemFontData->ValueStorageFor(eCSSProperty__x_system_font);
const PRBool haveSystemFont = systemFont &&
systemFont->GetUnit() != eCSSUnit_None &&
systemFont->GetUnit() != eCSSUnit_Null;
PRBool didSystemFont = PR_FALSE;
PRInt32 count = mOrder.Length();
PRInt32 index;
nsAutoTArray<nsCSSProperty, 16> shorthandsUsed;
for (index = 0; index < count; index++) {
nsCSSProperty property = OrderValueAt(index);
PRBool doneProperty = PR_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 = PR_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 = PR_TRUE;
break;
}
NS_ASSERTION(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.
AppendCSSValueToString(eCSSProperty__x_system_font, *systemFont,
value);
AppendPropertyAndValueToString(eCSSProperty_font, value, aString);
value.Truncate();
didSystemFont = PR_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.
NS_ASSERTION(nsCSSProps::kTypeTable[property] == eCSSType_Value,
"not a value typed subproperty");
const nsCSSValue *val =
systemFontData->ValueStorageFor(property);
if (property == eCSSProperty__x_system_font ||
(haveSystemFont && val && val->GetUnit() == eCSSUnit_System_Font)) {
doneProperty = PR_TRUE;
}
}
}
if (doneProperty)
continue;
NS_ASSERTION(value.IsEmpty(), "value should be empty now");
AppendPropertyAndValueToString(property, value, aString);
}
if (! aString.IsEmpty()) {
// if the string is not empty, we have a trailing whitespace we should remove
aString.Truncate(aString.Length() - 1);
}
return NS_OK;
}
#ifdef DEBUG
void nsCSSDeclaration::List(FILE* out, PRInt32 aIndent) const
{
for (PRInt32 index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("{ ", out);
nsAutoString s;
ToString(s);
fputs(NS_ConvertUTF16toUTF8(s).get(), out);
fputs("}", out);
}
#endif
nsresult
nsCSSDeclaration::GetNthProperty(PRUint32 aIndex, nsAString& aReturn) const
{
aReturn.Truncate();
if (aIndex < mOrder.Length()) {
nsCSSProperty property = OrderValueAt(aIndex);
if (0 <= property) {
AppendASCIItoUTF16(nsCSSProps::GetStringValue(property), aReturn);
}
}
return NS_OK;
}
nsCSSDeclaration*
nsCSSDeclaration::Clone() const
{
return new nsCSSDeclaration(*this);
}
PRBool
nsCSSDeclaration::InitializeEmpty()
{
NS_ASSERTION(!mData && !mImportantData, "already initialized");
mData = nsCSSCompressedDataBlock::CreateEmptyBlock();
return mData != nsnull;
}
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