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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop checks for operators, variables and literals used
# in void context.
class Void < Cop
OP_MSG = 'Operator `%s` used in void context.'.freeze
VAR_MSG = 'Variable `%s` used in void context.'.freeze
LIT_MSG = 'Literal `%s` used in void context.'.freeze
OPS = %w(* / % + - == === != < > <= >= <=>).freeze
def on_begin(node)
check_begin(node)
end
def on_kwbegin(node)
check_begin(node)
end
private
def check_begin(node)
expressions = *node
expressions.drop_last(1).each do |expr|
check_for_void_op(expr)
check_for_literal(expr)
check_for_var(expr)
end
end
def check_for_void_op(node)
return unless node.send_type? && node.loc.selector
op = node.loc.selector.source
add_offense(node, :selector, format(OP_MSG, op)) if OPS.include?(op)
end
def check_for_var(node)
return unless node.variable? || node.const_type?
add_offense(node, :name, format(VAR_MSG, node.loc.name.source))
end
def check_for_literal(node)
return if !node.literal? || node.xstr_type?
add_offense(node, :expression, format(LIT_MSG, node.source))
end
end
end
end
end
Version data entries
11 entries across 11 versions & 2 rubygems