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Contents
# encoding: utf-8
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.'
VAR_MSG = 'Variable `%s` used in void context.'
LIT_MSG = 'Literal `%s` used in void context.'
OPS = %w(* / % + - == === != < > <= >= <=>)
VARS = [:ivar, :lvar, :cvar, :const]
LITERALS = [:str, :dstr, :int, :float, :array,
:hash, :regexp, :nil, :true, :false, :sym]
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.type == :send
return unless 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 VARS.include?(node.type)
add_offense(node, :name, format(VAR_MSG, node.loc.name.source))
end
def check_for_literal(node)
return unless LITERALS.include?(node.type)
add_offense(node, :expression,
format(LIT_MSG, node.loc.expression.source))
end
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems