Created
November 6, 2018 16:01
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Refactor some functional compositions
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defmodule Functional do | |
def run() do | |
source = """ | |
def f(xs, f) do | |
Enum.map(xs, f) |> Enum.join(",") | |
Enum.map(xs, f) |> Enum.into(",") | |
end | |
""" | |
ast = Code.string_to_quoted!(source) | |
Macro.traverse(ast, %{issues: []}, &prewalk/2, &postwalk/2) | |
end | |
@pairs [{:map, :join}, {:map, :into}] | |
for {f1, f2} <- @pairs do | |
def prewalk( | |
{:|>, [line: line], | |
[ | |
{{:., _, [{:__aliases__, _, [:Enum]}, unquote(f1)]}, _, _}, | |
{{:., _, [{:__aliases__, _, [:Enum]}, unquote(f2)]}, _, _} | |
]} = ast, | |
acc | |
) do | |
{ast, %{acc | issues: [{line, unquote(f1), unquote(f2)}|acc.issues]}} | |
end | |
end | |
def prewalk(ast, acc) do | |
{ast, acc} | |
end | |
def postwalk(ast, acc) do | |
{ast, acc} | |
end | |
end |
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