How to get the parent of a node?

[lrengan]

Hi,

I am using the AST class together with the Parser gem. I am looking for a way to traverse up the AST from a given node, i.e., given a node, I want to access its parent. Any suggestions on how I can do this?

Thank you, LN

[mbj]

I keep references to parent while walking the ast. But AFAIK its generally an antipattern and I try to avoid it as far as possible.

On Tue, Oct 15, 2013 at 01:48:04PM -0700, Lakshminarayanan Renganarayana wrote:

Hi,

I am using the AST class together with the Parser gem. I am looking for a way to traverse up the AST from a given node, i.e., given a node, I want to access its parent. Any suggestions on how I can do this?

Thank you, LN

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[whitequark]

It is not possible. Generally, you would need to either keep a reference to the parent, as @mbj said, or, preferably, handle the parent itself. I may be able to help you if you post a more specific example in whitequark/parser#111.