class RuboCop::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) some_var do_something end
@example
# good def some_method do_something some_num * 10 end
@example
# good def some_method(some_var) do_something some_var end
Constants
- BINARY_OPERATORS
- DEFINED_MSG
- LIT_MSG
- OPERATORS
- OP_MSG
- SELF_MSG
- UNARY_OPERATORS
- VAR_MSG
- VOID_CONTEXT_TYPES
Public Instance Methods
on_begin(node)
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# File lib/rubocop/cop/lint/void.rb, line 55 def on_begin(node) check_begin(node) end
Also aliased as: on_kwbegin
Private Instance Methods
check_begin(node)
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# File lib/rubocop/cop/lint/void.rb, line 62 def check_begin(node) expressions = *node expressions = expressions.drop_last(1) unless in_void_context?(node) expressions.each do |expr| check_void_op(expr) check_literal(expr) check_var(expr) check_self(expr) check_defined(expr) end end
check_defined(node)
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# File lib/rubocop/cop/lint/void.rb, line 102 def check_defined(node) return unless node.defined_type? add_offense(node, message: format(DEFINED_MSG, node.source)) end
check_literal(node)
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# File lib/rubocop/cop/lint/void.rb, line 90 def check_literal(node) return if !node.literal? || node.xstr_type? add_offense(node, message: format(LIT_MSG, node.source)) end
check_self(node)
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# File lib/rubocop/cop/lint/void.rb, line 96 def check_self(node) return unless node.self_type? add_offense(node, message: SELF_MSG) end
check_var(node)
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# File lib/rubocop/cop/lint/void.rb, line 82 def check_var(node) return unless node.variable? || node.const_type? add_offense(node, location: :name, message: format(VAR_MSG, node.loc.name.source)) end
check_void_op(node)
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# File lib/rubocop/cop/lint/void.rb, line 74 def check_void_op(node) return unless node.send_type? && OPERATORS.include?(node.method_name) add_offense(node, location: :selector, message: format(OP_MSG, node.method_name)) end
in_void_context?(node)
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# File lib/rubocop/cop/lint/void.rb, line 108 def in_void_context?(node) parent = node.parent return false unless parent && parent.children.last == node VOID_CONTEXT_TYPES.include?(parent.type) && parent.void_context? end