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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/match_in_condition.ex
defmodule Credo.Check.Refactor.MatchInCondition do
@moduledoc """
Pattern matching should not be used in `if` and `unless`.
Example:
if {:ok, value} = parameter1 do
do_something
end
"""
@explanation [check: @moduledoc]
@condition_ops [:if, :unless]
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
for op <- @condition_ops do
defp traverse({unquote(op), meta, arguments} = ast, issues, source_file) do
new_issue =
issue_for_first_condition(arguments |> List.first, unquote(op), meta, source_file)
{ast, issues ++ List.wrap(new_issue)}
end
end
defp traverse(ast, issues, _source_file) do
{ast, issues}
end
defp issue_for_first_condition({:=, meta, _arguments}, op, meta, source_file) do
issue_for(op, meta[:line], "=", source_file)
end
defp issue_for_first_condition(_, _, _, _), do: nil
defp issue_for(op, line_no, trigger, source_file) do
format_issue source_file,
message: "There should be no matches in `#{op}` conditions.",
trigger: trigger,
line_no: line_no
end
end