ast.unparse can't deal with CPPCodeValue

[gordonwatts]

Is there a way we could "tap" into ast.unparse?

ast.unparse(source)
"Select(Where(EventDataset(), lambda e: 1 > 10), lambda e: Select(('hi'), lambda j: j.pt()))"
ast.dump(source)
"Call(func=Name(id='Select', ctx=Load()), args=[Call(func=Name(id='Where', ctx=Load()), args=[Call(func=Name(id='EventDataset', ctx=Load())), Lambda(args=arguments(args=[arg(arg='e')]), body=Compare(left=Constant(value=1), ops=[Gt()], comparators=[Constant(value=10)]))]), Lambda(args=arguments(args=[arg(arg='e')]), body=Call(func=Name(id='Select', ctx=Load()), args=[Call(func=CPPCodeValue(), args=[Constant(value='hi')]), Lambda(args=arguments(args=[arg(arg='j')]), body=Call(func=Attribute(value=Name(id='j', ctx=Load()), attr='pt', ctx=Load())))]))])"

[gordonwatts]

It uses similar extensibility features as the regular traversal. So we'd need to modify the _Unparser class:

def unparse(ast_obj):
    unparser = _Unparser()
    return unparser.visit(ast_obj)

and add something that does this:

    def visit_Call(self, node):
        self.set_precedence(_Precedence.ATOM, node.func)
        self.traverse(node.func)
        with self.delimit("(", ")"):
            comma = False
            for e in node.args:
                if comma:
                    self.write(", ")
                else:
                    comma = True
                self.traverse(e)

In short - a huge amount of work... too bad there isn't built n extensibility!