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# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop checks for ambiguous operators in the first argument of a
# method invocation without parentheses.
#
# @example
#
# # bad
#
# # The `*` is interpreted as a splat operator but it could possibly be
# # a `*` method invocation (i.e. `do_something.*(some_array)`).
# do_something *some_array
#
# @example
#
# # good
#
# # With parentheses, there's no ambiguity.
# do_something(*some_array)
class AmbiguousOperator < Cop
include ParserDiagnostic
AMBIGUITIES = {
'+' => { actual: 'positive number', possible: 'addition' },
'-' => { actual: 'negative number', possible: 'subtraction' },
'*' => { actual: 'splat', possible: 'multiplication' },
'&' => { actual: 'block', possible: 'binary AND' },
'**' => { actual: 'keyword splat', possible: 'exponent' }
}.each do |key, hash|
hash[:operator] = key
end
MSG_FORMAT = 'Ambiguous %<actual>s operator. Parenthesize the method ' \
"arguments if it's surely a %<actual>s operator, or add " \
'a whitespace to the right of the `%<operator>s` if it ' \
'should be a %<possible>s.'.freeze
private
def relevant_diagnostic?(diagnostic)
diagnostic.reason == :ambiguous_prefix
end
def alternative_message(diagnostic)
operator = diagnostic.location.source
hash = AMBIGUITIES[operator]
format(MSG_FORMAT, hash)
end
end
end
end
end
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