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Contents
# encoding: utf-8
module RuboCop
module Cop
module Lint
# Checks for space between a the name of a called method and a left
# parenthesis.
#
# @example
#
# puts (x + y)
class ParenthesesAsGroupedExpression < Cop
MSG = '`(...)` interpreted as grouped expression.'
def on_send(node)
_receiver, method_name, args = *node
return if operator?(method_name) || method_name.to_s.end_with?('=')
return unless args && args.loc.expression.source.start_with?('(')
space_length = spaces_before_left_parenthesis(node)
return unless space_length > 0
expr = args.loc.expression
space_range =
Parser::Source::Range.new(expr.source_buffer,
expr.begin_pos - space_length,
expr.begin_pos)
add_offense(nil, space_range)
end
private
def spaces_before_left_parenthesis(node)
receiver, method_name, _args = *node
receiver_length = if receiver
receiver.loc.expression.source.length
else
0
end
without_receiver = node.loc.expression.source[receiver_length..-1]
# Escape question mark if any.
method_regexp = Regexp.escape(method_name)
match = without_receiver.match(/^\s*\.?\s*#{method_regexp}(\s+)\(/)
match ? match.captures[0].length : 0
end
end
end
end
end
Version data entries
11 entries across 11 versions & 2 rubygems