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lib/pathex/common.ex
defmodule Pathex.Common do
def update_variables(ast, func, context \\ nil) when is_function(func, 1) do
Macro.postwalk(ast, fn
{n, c, ^context} = v when is_atom(n) and is_list(c) ->
func.(v)
other ->
other
end)
end
def detect_variables(ast, context \\ nil) do
Macro.prewalk(ast, [], fn
{name, ctx, ^context} = var, acc when is_atom(name) and is_list(ctx) ->
{var, [var | acc]}
other, acc ->
{other, acc}
end)
end
end