forked from rubocop/rubocop
/
parentheses_as_grouped_expression.rb
84 lines (66 loc) · 2.35 KB
/
parentheses_as_grouped_expression.rb
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# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# Checks for space between the name of a called method and a left
# parenthesis.
#
# @example
#
# # bad
# do_something (foo)
#
# # good
# do_something(foo)
# do_something (2 + 3) * 4
# do_something (foo * bar).baz
class ParenthesesAsGroupedExpression < Cop
include RangeHelp
MSG = '`(...)` interpreted as grouped expression.'
def on_send(node)
return if valid_context?(node)
space_length = spaces_before_left_parenthesis(node)
return unless space_length.positive?
range = space_range(node.first_argument.source_range, space_length)
add_offense(node, location: range)
end
alias on_csend on_send
def autocorrect(node)
space_length = spaces_before_left_parenthesis(node)
range = space_range(node.first_argument.source_range, space_length)
lambda do |corrector|
corrector.remove(range)
end
end
private
def valid_context?(node)
return true unless node.arguments.one? && first_arugment_starts_with_left_parenthesis?(node)
node.operator_method? || node.setter_method? || grouped_parentheses?(node)
end
def first_arugment_starts_with_left_parenthesis?(node)
node.first_argument.source.start_with?('(')
end
def grouped_parentheses?(node)
first_argument = node.first_argument
first_argument.send_type? && first_argument.receiver&.begin_type?
end
def spaces_before_left_parenthesis(node)
receiver = node.receiver
receiver_length = if receiver
receiver.source.length
else
0
end
without_receiver = node.source[receiver_length..-1]
# Escape question mark if any.
method_regexp = Regexp.escape(node.method_name)
match = without_receiver.match(/^\s*&?\.?\s*#{method_regexp}(\s+)\(/)
match ? match.captures[0].length : 0
end
def space_range(expr, space_length)
range_between(expr.begin_pos - space_length, expr.begin_pos)
end
end
end
end
end