protected override Expression VisitExtension(Expression node)
{
if (node is YieldExpression ||
node is GeneratorExpression ||
node is FinallyFlowControlExpression)
{
// These should be rewritten last, when doing finaly compilation
// for now, just walk them so we can find other nodes
return(base.VisitExtension(node));
}
GlobalVariableExpression global = node as GlobalVariableExpression;
if (global != null)
{
return(RewriteGet(global));
}
CodeContextExpression cc = node as CodeContextExpression;
if (cc != null)
{
return(_context);
}
CodeContextScopeExpression ccs = node as CodeContextScopeExpression;
if (ccs != null)
{
return(Rewrite(ccs));
}
AssignmentExtensionExpression aee = node as AssignmentExtensionExpression;
if (aee != null)
{
return(Rewrite(aee));
}
// Must remove extension nodes because they could contain
// one of the above node types. See, e.g. DeleteUnboundExpression
return(Visit(node.ReduceExtensions()));
}
protected internal virtual void PostWalk(CodeContextExpression node) { }
// CodeContextExpression
protected internal virtual bool Walk(CodeContextExpression node) { return true; }
protected internal virtual void PostWalk(CodeContextExpression node)
{
}
// CodeContextExpression
protected internal virtual bool Walk(CodeContextExpression node)
{
return(true);
}
