有内置的递归打印树的方法吗？

Question

I am learning Go and looking for a way to print my AST (For reference, I'm following along with Ruslan's excellent Let's Build a Simple Interpreter).

I am printing the root with the following:

tree := par.Parse()
fmt.Printf("
Parse Tree:
%#v
", tree)

Which prints:

Parse Tree:
&Node.Program{name:"PART10AST", block:(*Node.Block)(0x11b32160)}

Is there a way to recursively print a node, and all child nodes? Something to the effect of:

&Node.Program{name:"PART10AST", block:(*Node.Block{decl: *Node.declarations{...}, comp: *Node.Compound{...}})}

Is this functionality built in to Go in any way? Node is an interface for several different types of structs which store data and/or more Nodes.

Answer 1

You are looking for ast.Fprint, https://godoc.org/go/ast#Fprint