class RubbyCop::Cop::Lint::Void

This cop checks for operators, variables and literals used in void context.

@example

# bad

def some_method
  some_num * 10
  do_something
end

@example

# bad

def some_method
  some_var
  do_something
end

@example

# good

def some_method
  do_something
  some_num * 10
end

@example

# good

def some_method
  do_something
  some_var
end

Constants

DEFINED_MSG
LIT_MSG
OPS
OP_MSG
SELF_MSG
VAR_MSG

Public Instance Methods

on_begin(node) click to toggle source
# File lib/rubbycop/cop/lint/void.rb, line 53
def on_begin(node)
  check_begin(node)
end
on_kwbegin(node) click to toggle source
# File lib/rubbycop/cop/lint/void.rb, line 57
def on_kwbegin(node)
  check_begin(node)
end

Private Instance Methods

check_begin(node) click to toggle source
# File lib/rubbycop/cop/lint/void.rb, line 63
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)
    check_for_self(expr)
    check_for_defined(expr)
  end
end
check_for_defined(node) click to toggle source
# File lib/rubbycop/cop/lint/void.rb, line 100
def check_for_defined(node)
  return unless node.defined_type?

  add_offense(node, :expression, format(DEFINED_MSG, node.source))
end
check_for_literal(node) click to toggle source
# File lib/rubbycop/cop/lint/void.rb, line 88
def check_for_literal(node)
  return if !node.literal? || node.xstr_type?

  add_offense(node, :expression, format(LIT_MSG, node.source))
end
check_for_self(node) click to toggle source
# File lib/rubbycop/cop/lint/void.rb, line 94
def check_for_self(node)
  return unless node.self_type?

  add_offense(node, :expression, SELF_MSG)
end
check_for_var(node) click to toggle source
# File lib/rubbycop/cop/lint/void.rb, line 83
def check_for_var(node)
  return unless node.variable? || node.const_type?
  add_offense(node, :name, format(VAR_MSG, node.loc.name.source))
end
check_for_void_op(node) click to toggle source
# File lib/rubbycop/cop/lint/void.rb, line 75
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