CSS-like AST selector builder.

Selectors are built from a starting pattern and relationship steps:

import ExAST.Selector

pattern("defmodule _ do ... end")
|> descendant("def _ do ... end")
|> child("IO.inspect(_)")

The final step is the selected node. Use where/2 with predicates such as has_child/1, has_descendant/1, parent/1, and ancestor/1 to filter the selected node without changing it.

pattern("def _ do ... end")
|> where(has_descendant("Repo.transaction(_)"))
|> where(not(has_descendant("IO.inspect(_)")))

not/1 has the same name as Kernel.not/1, so import with import Kernel, except: [not: 1] when you want bare not(...) calls.