func (me *Rule) Walk(walker func(rule *Rule) *Rule) *Rule {
node_res := tree.Walk(me,
func(node tree.Noder) tree.Noder {
rule_res := walker(node.(*Rule))
if rule_res == nil {
return nil
} else {
return rule_res
}
})
return node_res.(*Rule)
}
func (me *Ast) Walk(walker func(ast *Ast) *Ast) *Ast {
node_res := tree.Walk(me,
func(node tree.Noder) tree.Noder {
ast_res := walker(node.(*Ast))
if ast_res == nil {
return nil
} else {
return ast_res
}
})
if node_res != nil {
return node_res.(*Ast)
} else {
return nil
}
}