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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/warning/bool_operation_on_same_values.ex
defmodule Credo.Check.Warning.BoolOperationOnSameValues do
@moduledoc """
Boolean operations with identical values on the left and right side are
most probably a logical fallacy or a copy-and-paste error.
Examples:
x && x
x || x
x and x
x or x
Each of these cases behaves the same as if you were just writing `x`.
"""
@explanation [check: @moduledoc]
@ops [:and, :or, :&&, :||]
use Credo.Check, base_priority: :high
@doc false
def run(source_file, params \\ []) do
issue_meta = IssueMeta.for(source_file, params)
Credo.Code.prewalk(source_file, &traverse(&1, &2, issue_meta))
end
for op <- @ops do
defp traverse({unquote(op), meta, [lhs, rhs]} = ast, issues, issue_meta) do
if CodeHelper.remove_metadata(lhs) === CodeHelper.remove_metadata(rhs) do
new_issue = issue_for(issue_meta, meta[:line], unquote(op))
{ast, issues ++ [new_issue]}
else
{ast, issues}
end
end
end
defp traverse(ast, issues, _issue_meta) do
{ast, issues}
end
defp issue_for(issue_meta, line_no, trigger) do
format_issue(
issue_meta,
message:
"There are identical sub-expressions to the left and to the right of the '#{trigger}' operator.",
trigger: trigger,
line_no: line_no
)
end
end