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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
* Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "CSSDefaultStyleSheets.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "HTMLAnchorElement.h"
#include "HTMLAudioElement.h"
#include "HTMLBRElement.h"
#include "MathMLElement.h"
#include "MediaQueryEvaluator.h"
#include "Page.h"
#include "RenderTheme.h"
#include "RuleSet.h"
#include "SVGElement.h"
#include "StyleSheetContents.h"
#include "UserAgentStyleSheets.h"
#include <wtf/NeverDestroyed.h>
namespace WebCore {
using namespace HTMLNames;
RuleSet* CSSDefaultStyleSheets::defaultStyle;
RuleSet* CSSDefaultStyleSheets::defaultQuirksStyle;
RuleSet* CSSDefaultStyleSheets::defaultPrintStyle;
unsigned CSSDefaultStyleSheets::defaultStyleVersion;
StyleSheetContents* CSSDefaultStyleSheets::simpleDefaultStyleSheet;
StyleSheetContents* CSSDefaultStyleSheets::defaultStyleSheet;
StyleSheetContents* CSSDefaultStyleSheets::quirksStyleSheet;
StyleSheetContents* CSSDefaultStyleSheets::svgStyleSheet;
StyleSheetContents* CSSDefaultStyleSheets::mathMLStyleSheet;
StyleSheetContents* CSSDefaultStyleSheets::mediaControlsStyleSheet;
StyleSheetContents* CSSDefaultStyleSheets::fullscreenStyleSheet;
StyleSheetContents* CSSDefaultStyleSheets::plugInsStyleSheet;
StyleSheetContents* CSSDefaultStyleSheets::imageControlsStyleSheet;
// FIXME: It would be nice to use some mechanism that guarantees this is in sync with the real UA stylesheet.
static const char* simpleUserAgentStyleSheet = "html,body,div{display:block}head{display:none}body{margin:8px}div:focus,span:focus,a:focus{outline:auto 5px -webkit-focus-ring-color}a:any-link{color:-webkit-link;text-decoration:underline}a:any-link:active{color:-webkit-activelink}";
static inline bool elementCanUseSimpleDefaultStyle(Element& element)
{
return is<HTMLHtmlElement>(element) || is<HTMLHeadElement>(element)
|| is<HTMLBodyElement>(element) || is<HTMLDivElement>(element)
|| is<HTMLSpanElement>(element) || is<HTMLBRElement>(element)
|| is<HTMLAnchorElement>(element);
}
static const MediaQueryEvaluator& screenEval()
{
static NeverDestroyed<const MediaQueryEvaluator> staticScreenEval("screen");
return staticScreenEval;
}
static const MediaQueryEvaluator& printEval()
{
static NeverDestroyed<const MediaQueryEvaluator> staticPrintEval("print");
return staticPrintEval;
}
static StyleSheetContents* parseUASheet(const String& str)
{
StyleSheetContents& sheet = StyleSheetContents::create().leakRef(); // leak the sheet on purpose
sheet.parseString(str);
return &sheet;
}
static StyleSheetContents* parseUASheet(const char* characters, unsigned size)
{
return parseUASheet(String(characters, size));
}
void CSSDefaultStyleSheets::initDefaultStyle(Element* root)
{
if (!defaultStyle) {
if (!root || elementCanUseSimpleDefaultStyle(*root))
loadSimpleDefaultStyle();
else
loadFullDefaultStyle();
}
}
void CSSDefaultStyleSheets::loadFullDefaultStyle()
{
if (simpleDefaultStyleSheet) {
ASSERT(defaultStyle);
ASSERT(defaultPrintStyle == defaultStyle);
delete defaultStyle;
simpleDefaultStyleSheet->deref();
defaultStyle = std::make_unique<RuleSet>().release();
defaultPrintStyle = std::make_unique<RuleSet>().release();
simpleDefaultStyleSheet = 0;
} else {
ASSERT(!defaultStyle);
defaultStyle = std::make_unique<RuleSet>().release();
defaultPrintStyle = std::make_unique<RuleSet>().release();
defaultQuirksStyle = std::make_unique<RuleSet>().release();
}
// Strict-mode rules.
String defaultRules = String(htmlUserAgentStyleSheet, sizeof(htmlUserAgentStyleSheet)) + RenderTheme::defaultTheme()->extraDefaultStyleSheet();
defaultStyleSheet = parseUASheet(defaultRules);
defaultStyle->addRulesFromSheet(*defaultStyleSheet, screenEval());
defaultPrintStyle->addRulesFromSheet(*defaultStyleSheet, printEval());
// Quirks-mode rules.
String quirksRules = String(quirksUserAgentStyleSheet, sizeof(quirksUserAgentStyleSheet)) + RenderTheme::defaultTheme()->extraQuirksStyleSheet();
quirksStyleSheet = parseUASheet(quirksRules);
defaultQuirksStyle->addRulesFromSheet(*quirksStyleSheet, screenEval());
}
void CSSDefaultStyleSheets::loadSimpleDefaultStyle()
{
ASSERT(!defaultStyle);
ASSERT(!simpleDefaultStyleSheet);
defaultStyle = std::make_unique<RuleSet>().release();
// There are no media-specific rules in the simple default style.
defaultPrintStyle = defaultStyle;
defaultQuirksStyle = std::make_unique<RuleSet>().release();
simpleDefaultStyleSheet = parseUASheet(simpleUserAgentStyleSheet, strlen(simpleUserAgentStyleSheet));
defaultStyle->addRulesFromSheet(*simpleDefaultStyleSheet, screenEval());
++defaultStyleVersion;
// No need to initialize quirks sheet yet as there are no quirk rules for elements allowed in simple default style.
}
void CSSDefaultStyleSheets::ensureDefaultStyleSheetsForElement(Element& element)
{
if (simpleDefaultStyleSheet && !elementCanUseSimpleDefaultStyle(element)) {
loadFullDefaultStyle();
++defaultStyleVersion;
}
if (is<HTMLElement>(element)) {
if (is<HTMLObjectElement>(element) || is<HTMLEmbedElement>(element)) {
if (!plugInsStyleSheet) {
String plugInsRules = RenderTheme::themeForPage(element.document().page())->extraPlugInsStyleSheet() + element.document().page()->chrome().client().plugInExtraStyleSheet();
if (plugInsRules.isEmpty())
plugInsRules = String(plugInsUserAgentStyleSheet, sizeof(plugInsUserAgentStyleSheet));
plugInsStyleSheet = parseUASheet(plugInsRules);
defaultStyle->addRulesFromSheet(*plugInsStyleSheet, screenEval());
++defaultStyleVersion;
}
}
#if ENABLE(VIDEO)
else if (is<HTMLMediaElement>(element)) {
if (!mediaControlsStyleSheet) {
String mediaRules = RenderTheme::themeForPage(element.document().page())->mediaControlsStyleSheet();
if (mediaRules.isEmpty())
mediaRules = String(mediaControlsUserAgentStyleSheet, sizeof(mediaControlsUserAgentStyleSheet)) + RenderTheme::themeForPage(element.document().page())->extraMediaControlsStyleSheet();
mediaControlsStyleSheet = parseUASheet(mediaRules);
defaultStyle->addRulesFromSheet(*mediaControlsStyleSheet, screenEval());
defaultPrintStyle->addRulesFromSheet(*mediaControlsStyleSheet, printEval());
++defaultStyleVersion;
}
}
#endif // ENABLE(VIDEO)
#if ENABLE(SERVICE_CONTROLS)
else if (is<HTMLDivElement>(element) && element.isImageControlsRootElement()) {
if (!imageControlsStyleSheet) {
String imageControlsRules = RenderTheme::themeForPage(element.document().page())->imageControlsStyleSheet();
imageControlsStyleSheet = parseUASheet(imageControlsRules);
defaultStyle->addRulesFromSheet(*imageControlsStyleSheet, screenEval());
defaultPrintStyle->addRulesFromSheet(*imageControlsStyleSheet, printEval());
++defaultStyleVersion;
}
}
#endif // ENABLE(SERVICE_CONTROLS)
} else if (is<SVGElement>(element)) {
if (!svgStyleSheet) {
// SVG rules.
svgStyleSheet = parseUASheet(svgUserAgentStyleSheet, sizeof(svgUserAgentStyleSheet));
defaultStyle->addRulesFromSheet(*svgStyleSheet, screenEval());
defaultPrintStyle->addRulesFromSheet(*svgStyleSheet, printEval());
++defaultStyleVersion;
}
}
#if ENABLE(MATHML)
else if (is<MathMLElement>(element)) {
if (!mathMLStyleSheet) {
// MathML rules.
mathMLStyleSheet = parseUASheet(mathmlUserAgentStyleSheet, sizeof(mathmlUserAgentStyleSheet));
defaultStyle->addRulesFromSheet(*mathMLStyleSheet, screenEval());
defaultPrintStyle->addRulesFromSheet(*mathMLStyleSheet, printEval());
++defaultStyleVersion;
}
}
#endif // ENABLE(MATHML)
#if ENABLE(FULLSCREEN_API)
if (!fullscreenStyleSheet && element.document().webkitIsFullScreen()) {
String fullscreenRules = String(fullscreenUserAgentStyleSheet, sizeof(fullscreenUserAgentStyleSheet)) + RenderTheme::defaultTheme()->extraFullScreenStyleSheet();
fullscreenStyleSheet = parseUASheet(fullscreenRules);
defaultStyle->addRulesFromSheet(*fullscreenStyleSheet, screenEval());
defaultQuirksStyle->addRulesFromSheet(*fullscreenStyleSheet, screenEval());
++defaultStyleVersion;
}
#endif // ENABLE(FULLSCREEN_API)
ASSERT(defaultStyle->features().idsInRules.isEmpty());
ASSERT(mathMLStyleSheet || defaultStyle->features().siblingRules.isEmpty());
}
} // namespace WebCore
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