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credo
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A static code analysis tool with a focus on code consistency and teaching.
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lib/credo/check/refactor/pipe_chain_start.ex
defmodule Credo.Check.Refactor.PipeChainStart do
@moduledoc """
Checks that each pipe chains start with a "raw" value for better readability.
"""
@explanation [check: @moduledoc]
use Credo.Check
def run(%SourceFile{ast: ast} = source_file, params \\ []) do
issue_meta = IssueMeta.for(source_file, params)
Credo.Code.traverse(ast, &traverse(&1, &2, issue_meta))
end
defp traverse({:|>, _, [{:|>, _, _} | _]} = ast, issues, _issue_meta) do
{ast, issues}
end
defp traverse({:|>, meta, [lhs | _rhs]} = ast, issues, issue_meta) do
if valid_chain_start?(lhs) do
{ast, issues}
else
{ast, issues ++ [issue_for(meta[:line], "TODO", issue_meta)]}
end
end
defp traverse(ast, issues, _issue_meta) do
{ast, issues}
end
for atom <- [:%, :%{}, :.., :<<>>, :@, :__aliases__, :unquote, :{}] do
defp valid_chain_start?({unquote(atom), _meta, _arguments}) do
true
end
end
defp valid_chain_start?({atom, _, arguments}) when is_atom(atom) and is_list(arguments) do
atom |> to_string |> String.match?(~r/^sigil_[a-zA-Z]$/)
end
defp valid_chain_start?({{:., _, [Access, :get]}, _, _}) do
true
end
defp valid_chain_start?({{:., _, _}, _, []}), do: true
defp valid_chain_start?({{:., _, _}, _, _}), do: false
defp valid_chain_start?(_), do: true
defp issue_for(line_no, trigger, issue_meta) do
format_issue issue_meta,
message: "Pipe chain should start with a raw value.",
trigger: trigger,
line_no: line_no
end
end