stratify.path

[mbostock]

This new d3.stratify feature imputes internal nodes using the specified path function, which returns slash-separated ids (as per a typical UNIX-y file system). Alternative to #184. Fixes #33.

[mbostock]

Demo here: https://observablehq.com/d/067a15f32eee749a

I think d3.stratify should not impute a root node "/" if there is only one explicit root (e.g., "/flare"). Update: done.

[Fil]

I've added some documentation.

Would it make sense to accept the path being returned as an array?
with data = [{path: "a,b,c,d,e,f"}, ...], we could say d3.stratify().path(d => d.path.split(","))(data)

this would avoid massaging a string and having to escape existing slashes in the identifiers.

[mbostock]

Would it make sense to accept the path being returned as an array?

Maybe. At the least if we don’t, we should allow escaping of backslashes…

I can try to do the array-based approach. I think we’ll still need some normalization so that "/foo/bar".split("/") and "foo/bar".split("/") are considered equivalent.

[Fil]

Yay!