Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 197 insertions, 0 deletions

diff --git a/Source/WebCore/dom/StyleElement.cpp b/Source/WebCore/dom/StyleElement.cpp
new file mode 100644
index 000000000..7657494ab
--- /dev/null
+++ b/Source/WebCore/dom/StyleElement.cpp
@@ -0,0 +1,197 @@
+/*
+ * Copyright (C) 2006, 2007 Rob Buis
+ * Copyright (C) 2008 Apple, 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 "StyleElement.h"
+
+#include "Attribute.h"
+#include "ContentSecurityPolicy.h"
+#include "Document.h"
+#include "Element.h"
+#include "MediaList.h"
+#include "MediaQueryEvaluator.h"
+#include "ScriptableDocumentParser.h"
+#include <wtf/text/StringBuilder.h>
+
+namespace WebCore {
+
+static bool isValidStyleChild(Node* node)
+{
+    ASSERT(node);
+    Node::NodeType nodeType = node->nodeType();
+    return nodeType == Node::TEXT_NODE || nodeType == Node::CDATA_SECTION_NODE;
+}
+
+static bool isCSS(Element* element, const AtomicString& type)
+{
+    return type.isEmpty() || (element->isHTMLElement() ? equalIgnoringCase(type, "text/css") : (type == "text/css"));
+}
+
+StyleElement::StyleElement(Document* document, bool createdByParser)
+    : m_createdByParser(createdByParser)
+    , m_loading(false)
+    , m_startLineNumber(0)
+{
+    if (createdByParser && document && document->scriptableDocumentParser())
+        m_startLineNumber = document->scriptableDocumentParser()->lineNumber().zeroBasedInt();
+}
+
+StyleElement::~StyleElement()
+{
+}
+
+void StyleElement::insertedIntoDocument(Document* document, Element* element)
+{
+    ASSERT(document);
+    ASSERT(element);
+    document->addStyleSheetCandidateNode(element, m_createdByParser);
+    if (m_createdByParser)
+        return;
+
+    process(element);
+}
+
+void StyleElement::removedFromDocument(Document* document, Element* element)
+{
+    ASSERT(document);
+    ASSERT(element);
+    document->removeStyleSheetCandidateNode(element);
+
+    if (m_sheet) {
+        ASSERT(m_sheet->ownerNode() == element);
+        m_sheet->clearOwnerNode();
+        m_sheet = 0;
+    }
+
+    // If we're in document teardown, then we don't need to do any notification of our sheet's removal.
+    if (document->renderer())
+        document->styleSelectorChanged(DeferRecalcStyle);
+}
+
+void StyleElement::clearDocumentData(Document* document, Element* element)
+{
+    if (m_sheet)
+        m_sheet->clearOwnerNode();
+
+    if (element->inDocument())
+        document->removeStyleSheetCandidateNode(element);
+}
+
+void StyleElement::childrenChanged(Element* element)
+{
+    ASSERT(element);
+    if (m_createdByParser)
+        return;
+
+    process(element);
+}
+
+void StyleElement::finishParsingChildren(Element* element)
+{
+    ASSERT(element);
+    process(element);
+    m_createdByParser = false;
+}
+
+void StyleElement::process(Element* e)
+{
+    if (!e || !e->inDocument())
+        return;
+
+    unsigned resultLength = 0;
+    for (Node* c = e->firstChild(); c; c = c->nextSibling()) {
+        if (isValidStyleChild(c)) {
+            unsigned length = c->nodeValue().length();
+            if (length > std::numeric_limits<unsigned>::max() - resultLength) {
+                createSheet(e, m_startLineNumber, "");
+                return;
+            }
+            resultLength += length;
+        }
+    }
+    StringBuilder sheetText;
+    sheetText.reserveCapacity(resultLength);
+
+    for (Node* c = e->firstChild(); c; c = c->nextSibling()) {
+        if (isValidStyleChild(c)) {
+            sheetText.append(c->nodeValue());
+        }
+    }
+    ASSERT(sheetText.length() == resultLength);
+
+    createSheet(e, m_startLineNumber, sheetText.toString());
+}
+
+void StyleElement::createSheet(Element* e, int startLineNumber, const String& text)
+{
+    ASSERT(e);
+    ASSERT(e->inDocument());
+    Document* document = e->document();
+    if (m_sheet) {
+        if (m_sheet->isLoading())
+            document->removePendingSheet();
+        m_sheet = 0;
+    }
+
+    // If type is empty or CSS, this is a CSS style sheet.
+    const AtomicString& type = this->type();
+    if (document->contentSecurityPolicy()->allowInlineStyle() && isCSS(e, type)) {
+        RefPtr<MediaList> mediaList = MediaList::create(media(), e->isHTMLElement());
+        MediaQueryEvaluator screenEval("screen", true);
+        MediaQueryEvaluator printEval("print", true);
+        if (screenEval.eval(mediaList.get()) || printEval.eval(mediaList.get())) {
+            document->addPendingSheet();
+            m_loading = true;
+            m_sheet = CSSStyleSheet::create(e, String(), KURL(), document->inputEncoding());
+            m_sheet->parseStringAtLine(text, !document->inQuirksMode(), startLineNumber);
+            m_sheet->setMedia(mediaList.get());
+            m_sheet->setTitle(e->title());
+            m_loading = false;
+        }
+    }
+
+    if (m_sheet)
+        m_sheet->checkLoaded();
+}
+
+bool StyleElement::isLoading() const
+{
+    if (m_loading)
+        return true;
+    return m_sheet ? m_sheet->isLoading() : false;
+}
+
+bool StyleElement::sheetLoaded(Document* document)
+{
+    ASSERT(document);
+    if (isLoading())
+        return false;
+
+    document->removePendingSheet();
+    return true;
+}
+
+void StyleElement::startLoadingDynamicSheet(Document* document)
+{
+    ASSERT(document);
+    document->addPendingSheet();
+}
+
+}