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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/case_trivial_matches.ex
defmodule Credo.Check.Refactor.CaseTrivialMatches do
@moduledoc """
A case statement should contain "more" than just `true` and `false`.
Example:
case x == y do
true -> 0
false -> 1
end
# should be written as
if x == y do
0
else
1
end
"""
@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({:case, meta, arguments} = ast, issues, issue_meta) do
cases =
arguments
|> CodeHelper.do_block_for!
|> List.wrap
|> Enum.map(&case_statement_for/1)
|> Enum.sort
if cases == [false, true] do
{ast, issues ++ [issue_for(issue_meta, meta[:line], :cond)]}
else
{ast, issues}
end
end
defp traverse(ast, issues, _issue_meta) do
{ast, issues}
end
defp case_statement_for({:->, _, [[true], _]}), do: true
defp case_statement_for({:->, _, [[false], _]}), do: false
defp case_statement_for(_), do: nil
def issue_for(issue_meta, line_no, trigger) do
format_issue issue_meta,
message: "Case statements should not only contain `true` and `false`.",
trigger: trigger,
line_no: line_no
end
end