[import] Cleanup: get rid of ad-hoc state machine.

Source/core/html/HTMLImportStateResolver.cpp

 /*
  * Copyright (C) 2014 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 11 matching lines @@
  * 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 "core/svg/SVGRectTearOff.h"
-
-#include "bindings/v8/ExceptionState.h"
-#include "core/dom/ExceptionCode.h"
+#include "core/html/HTMLImportStateResolver.h"
 
 namespace WebCore {
 
-SVGRectTearOff::SVGRectTearOff(PassRefPtr<SVGRect> target, SVGElement* contextElement, PropertyIsAnimValType propertyIsAnimVal, const QualifiedName& attributeName)
-    : NewSVGPropertyTearOff<SVGRect>(target, contextElement, propertyIsAnimVal, attributeName)
+inline bool HTMLImportStateResolver::isBlockingFollowers(HTMLImport* import)
 {
-    ScriptWrappable::init(this);
+    if (!import->hasLoader())
+        return true;
+    if (!import->ownsLoader())
+        return false;
+    return !import->isStateReady();
 }
 
-void SVGRectTearOff::setX(float f, ExceptionState& exceptionState)
+inline bool HTMLImportStateResolver::isBlockedFromCreatingDocument() const
 {
-    if (isImmutable()) {
-        exceptionState.throwDOMException(NoModificationAllowedError, "The attribute is read-only.");
-        return;
+    // If any of its preceeding imports isn't ready, this import
+    // cannot start loading because such preceeding onces can include
+    // duplicating import that should wins over this.
+    for (const HTMLImport* ancestor = m_import; ancestor; ancestor = ancestor->parent()) {
+        if (ancestor->previous() && isBlockingFollowers(ancestor->previous()))
+            return true;
     }
 
-    target()->setX(f);
-    commitChange();
+    return false;
 }
 
-void SVGRectTearOff::setY(float f, ExceptionState& exceptionState)
+inline bool HTMLImportStateResolver::isBlockedFromRunningScript() const
 {
-    if (isImmutable()) {
-        exceptionState.throwDOMException(NoModificationAllowedError, "The attribute is read-only.");
-        return;
+    for (HTMLImport* child = m_import->firstChild(); child; child = child->next()) {
+        if (child->isCreatedByParser() && isBlockingFollowers(child))
+            return true;
     }
 
-    target()->setY(f);
-    commitChange();
+    return false;
 }
 
-void SVGRectTearOff::setWidth(float f, ExceptionState& exceptionState)
+inline bool HTMLImportStateResolver::isActive() const
 {
-    if (isImmutable()) {
-        exceptionState.throwDOMException(NoModificationAllowedError, "The attribute is read-only.");
-        return;
-    }
-
-    target()->setWidth(f);
-    commitChange();
+    return !m_import->isDone();
 }
 
-void SVGRectTearOff::setHeight(float f, ExceptionState& exceptionState)
+HTMLImport::State HTMLImportStateResolver::resolve() const
 {
-    if (isImmutable()) {
-        exceptionState.throwDOMException(NoModificationAllowedError, "The attribute is read-only.");
-        return;
-    }
-
-    target()->setHeight(f);
-    commitChange();
+    if (isBlockedFromCreatingDocument())
+        return HTMLImport::BlockedFromCreatingDocument;
+    if (isBlockedFromRunningScript())
+        return HTMLImport::BlockedFromRunningScript;
+    if (isActive())
+        return HTMLImport::Active;
+    return HTMLImport::Ready;
 }
 
 }
+