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styler

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A code-style enforcer that will just FIFY instead of complaining

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styler lib style.ex
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lib/style.ex 

# Copyright 2023 Adobe. All rights reserved.

# This file is licensed to you under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License. You may obtain a copy

# of the License at http://www.apache.org/licenses/LICENSE-2.0



# Unless required by applicable law or agreed to in writing, software distributed under

# the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS

# OF ANY KIND, either express or implied. See the License for the specific language

# governing permissions and limitations under the License.



defmodule Styler.Style do

  @moduledoc """

  A Style takes AST and returns a transformed version of that AST.



  Because these transformations involve traversing trees (the "T" in "AST"), we wrap the AST in a structure

  called a Zipper to facilitate walking the trees.

  """



  alias Styler.Zipper



  @type command :: :cont | :skip | :halt



  @doc """

  `run` will be used with `Zipper.traverse_while/3`, meaning it will be executed on every node of the AST.



  You can skip traversing parts of the tree by returning a Zipper that's further along in the traversal, for example

  by calling `Zipper.skip(zipper)` to skip an entire subtree you know is of no interest to your Style.

  """

  @callback run(Zipper.zipper()) :: Zipper.zipper() | {command(), Zipper.zipper()}



  @doc false

  # this lets Styles optionally implement as though they're running inside of `Zipper.traverse`

  # or `Zipper.traverse_while` for finer-grained control

  def wrap_run(style) do

    fn zipper ->

      case style.run(zipper) do

        {next, {_, _} = _zipper} = command when next in ~w(cont halt skip)a -> command

        zipper -> {:cont, zipper}

      end

    end

  end

end