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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop checks for mistyped shorthand assignments.
#
# @example
# # bad
# x =- y
# x =+ y
# x =* y
# x =! y
#
# # good
# x -= y # or x = -y
# x += y # or x = +y
# x *= y # or x = *y
# x != y # or x = !y
#
class AmbiguousAssignment < Base
include RangeHelp
MSG = 'Suspicious assignment detected. Did you mean `%<op>s`?'
SIMPLE_ASSIGNMENT_TYPES = %i[lvasgn ivasgn cvasgn gvasgn casgn].freeze
MISTAKES = { '=-' => '-=', '=+' => '+=', '=*' => '*=', '=!' => '!=' }.freeze
def on_asgn(node)
return unless (rhs = rhs(node))
range = range_between(node.loc.operator.end_pos - 1, rhs.source_range.begin_pos + 1)
source = range.source
return unless MISTAKES.key?(source)
add_offense(range, message: format(MSG, op: MISTAKES[source]))
end
SIMPLE_ASSIGNMENT_TYPES.each { |asgn_type| alias_method :"on_#{asgn_type}", :on_asgn }
private
def rhs(node)
if node.casgn_type?
node.children[2]
else
node.children[1]
end
end
end
end
end
end
Version data entries
38 entries across 38 versions & 6 rubygems