Bug 739033 - Allow external View Source editor code live dangerously. r=smaug.

parser/html/nsHtml5TreeOpExecutor.cpp

@@ -61,6 +61,7 @@
 #include "mozilla/Util.h" // DebugOnly
 #include "sampler.h"
 #include "nsIScriptError.h"
+#include "mozilla/Preferences.h"
 
 using namespace mozilla;
 
@@ -121,7 +122,8 @@ nsHtml5TreeOpExecutor::WillParse()
 NS_IMETHODIMP
 nsHtml5TreeOpExecutor::WillBuildModel(nsDTDMode aDTDMode)
 {
-  if (mDocShell && !GetDocument()->GetScriptGlobalObject()) {
+  if (mDocShell && !GetDocument()->GetScriptGlobalObject() &&
+      !IsExternalViewSource()) {
     // Not loading as data but script global object not ready
     return MarkAsBroken(NS_ERROR_DOM_INVALID_STATE_ERR);
   }
@@ -969,6 +971,27 @@ nsHtml5TreeOpExecutor::GetViewSourceBaseURI()
   return mViewSourceBaseURI;
 }
 
+//static
+void
+nsHtml5TreeOpExecutor::InitializeStatics()
+{
+  mozilla::Preferences::AddBoolVarCache(&sExternalViewSource,
+                                        "view_source.editor.external");
+}
+
+bool
+nsHtml5TreeOpExecutor::IsExternalViewSource()
+{
+  if (!sExternalViewSource) {
+    return false;
+  }
+  bool isViewSource = false;
+  if (mDocumentURI) {
+    mDocumentURI->SchemeIs("view-source", &isViewSource);
+  }
+  return isViewSource;
+}
+
 // Speculative loading
 
 already_AddRefed<nsIURI>
@@ -1060,3 +1083,4 @@ PRUint32 nsHtml5TreeOpExecutor::sAppendBatchExaminations = 0;
 PRUint32 nsHtml5TreeOpExecutor::sLongestTimeOffTheEventLoop = 0;
 PRUint32 nsHtml5TreeOpExecutor::sTimesFlushLoopInterrupted = 0;
 #endif
+bool nsHtml5TreeOpExecutor::sExternalViewSource = false;