Implement document.currentScript

Source/core/dom/ScriptElement.cpp

Index: Source/core/dom/ScriptElement.cpp
diff --git a/Source/core/dom/ScriptElement.cpp b/Source/core/dom/ScriptElement.cpp
index 6b5873893dd4efd1916cd66ccff94a1ac14bf5ad..d86592f5e9184a6ca57376160749d05a26c63ee9 100644
--- a/Source/core/dom/ScriptElement.cpp
+++ b/Source/core/dom/ScriptElement.cpp
@@ -282,6 +282,11 @@ bool ScriptElement::requestScript(const String& sourceUrl)
     return false;
 }
 
+bool isHTMLScriptElement(Element* element)
+{
+    return element->isHTMLElement() && element->hasTagName(HTMLNames::scriptTag);
+}
+
 void ScriptElement::executeScript(const ScriptSourceCode& sourceCode)
 {
     ASSERT(m_alreadyStarted);
@@ -307,10 +312,16 @@ void ScriptElement::executeScript(const ScriptSourceCode& sourceCode)
     if (frame) {
         {
             IgnoreDestructiveWriteCountIncrementer ignoreDesctructiveWriteCountIncrementer(m_isExternalScript ? document.get() : 0);
+
+            if (isHTMLScriptElement(m_element))
+                document->setCurrentScript(static_cast<HTMLScriptElement*>(m_element));
+
             // Create a script from the script element node, using the script
             // block's source and the script block's type.
             // Note: This is where the script is compiled and actually executed.
             frame->script()->evaluate(sourceCode);
+
+            document->clearCurrentScript();

[esprehn, 2013/05/15 16:08:16]

You're sure this is safe without checking if (document->currentScript() == this)
before it?

[arv (Not doing code reviews), 2013/05/15 16:18:11]

There is a case where this will fail. When you doc.write inline script it id
evaluated synchronously. I'll have to add tests and a stack to handle this case
correctly.

         }
     }
 }
@@ -417,7 +428,7 @@ String ScriptElement::scriptContent() const
 
 ScriptElement* toScriptElementIfPossible(Element* element)
 {
-    if (element->isHTMLElement() && element->hasTagName(HTMLNames::scriptTag))
+    if (isHTMLScriptElement(element))
         return static_cast<HTMLScriptElement*>(element);
 
 #if ENABLE(SVG)