Implement css-conditional's CSS.supports()
https://bugs.webkit.org/show_bug.cgi?id=100324
Patch by Pablo Flouret <pablof@motorola.com> on 2013-02-13
Reviewed by Antti Koivisto.
Source/WebCore:
http://dev.w3.org/csswg/css3-conditional/#the-css-interface
The supports() method provides the css @supports rule's corresponding
dom api.
The patch also adds the CSS interface on DOMWindow, which holds "useful
CSS-related functions that do not belong elsewhere". This is where
supports() lives.
Test: css3/supports-dom-api.html
* CMakeLists.txt:
* DerivedSources.cpp:
* DerivedSources.make:
* DerivedSources.pri:
* GNUmakefile.list.am:
* Target.pri:
* WebCore.exp.in:
* WebCore.gypi:
* WebCore.vcproj/WebCore.vcproj:
* WebCore.xcodeproj/project.pbxproj:
* bindings/gobject/GNUmakefile.am:
* bindings/scripts/CodeGeneratorGObject.pm:
(SkipFunction):
Add DOMWindowCSS.* to the build systems.
* bindings/scripts/CodeGenerator.pm:
(WK_lcfirst):
Handle CSS prefixes correctly (s/cSS/css/).
* css/CSSGrammar.y.in:
* css/CSSParser.cpp:
(WebCore::CSSParser::CSSParser):
(WebCore::CSSParser::parseSupportsCondition):
(WebCore::CSSParser::detectAtToken):
* css/CSSParser.h:
webkit_supports_condition parses just the condition part of an
@supports rule and evaluates it, outputting whether the condition
is supported or not.
* css/CSSAllInOne.cpp:
* css/DOMWindowCSS.cpp: Added.
* css/DOMWindowCSS.h: Added.
* css/DOMWindowCSS.idl: Added.
The CSS interface object.
* page/DOMWindow.cpp:
(WebCore::DOMWindow::css):
* page/DOMWindow.h:
* page/DOMWindow.idl:
window.CSS
LayoutTests:
* css3/supports-dom-api-expected.txt: Added.
* css3/supports-dom-api.html: Added.
* platform/chromium/TestExpectations:
* platform/efl/TestExpectations:
* platform/gtk/TestExpectations:
* platform/mac/TestExpectations:
* platform/qt/TestExpectations:
* platform/win/TestExpectations:
* platform/wincairo/TestExpectations:
* platform/wk2/TestExpectations:
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142739 268f45cc-cd09-0410-ab3c-d52691b4dbfc
diff --git a/Source/WebCore/css/DOMWindowCSS.cpp b/Source/WebCore/css/DOMWindowCSS.cpp
new file mode 100644
index 0000000..86611c2
--- /dev/null
+++ b/Source/WebCore/css/DOMWindowCSS.cpp
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2012 Motorola Mobility Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Motorola Mobility Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "DOMWindowCSS.h"
+
+#if ENABLE(CSS3_CONDITIONAL_RULES)
+
+#include "CSSParser.h"
+#include "StylePropertySet.h"
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+PassRefPtr<DOMWindowCSS> DOMWindowCSS::create()
+{
+ return adoptRef(new DOMWindowCSS());
+}
+
+static String valueWithoutImportant(const String& value)
+{
+ if (!value.endsWith("important", false))
+ return value;
+
+ String newValue = value;
+ int bangIndex = newValue.length() - 9 - 1;
+ if (newValue[bangIndex] == ' ')
+ bangIndex--;
+ newValue = newValue.left(bangIndex);
+
+ return newValue;
+}
+
+bool DOMWindowCSS::supports(const String& property, const String& value) const
+{
+ CSSPropertyID propertyID = cssPropertyID(property.stripWhiteSpace());
+
+ if (propertyID == CSSPropertyInvalid)
+ return false;
+
+ // CSSParser::parseValue() won't work correctly if !important is present,
+ // so just get rid of it. It doesn't matter to supports() if it's actually
+ // there or not, provided how it's specified in the value is correct.
+ String normalizedValue = value.stripWhiteSpace().simplifyWhiteSpace();
+ normalizedValue = valueWithoutImportant(normalizedValue);
+
+ if (normalizedValue.isEmpty())
+ return false;
+
+ RefPtr<StylePropertySet> dummyStyle = StylePropertySet::create();
+ return CSSParser::parseValue(dummyStyle.get(), propertyID, normalizedValue, false, CSSStrictMode, 0);
+}
+
+bool DOMWindowCSS::supports(const String& conditionText) const
+{
+ CSSParserContext context(CSSStrictMode);
+ CSSParser parser(context);
+ return parser.parseSupportsCondition(conditionText);
+}
+
+}
+
+#endif
