class RuboCop::Cop::Style::InfiniteLoop
Use `Kernel#loop` for infinite loops.
@example
# bad while true work end # good loop do work end
Constants
- LEADING_SPACE
- MSG
Public Instance Methods
after_leaving_scope(scope, _variable_table)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 27 def after_leaving_scope(scope, _variable_table) @variables ||= [] @variables.concat(scope.variables.values) end
autocorrect(node)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 43 def autocorrect(node) if node.while_post_type? || node.until_post_type? replace_begin_end_with_modifier(node) elsif node.modifier_form? replace_source(node.source_range, modifier_replacement(node)) else replace_source(non_modifier_range(node), 'loop do') end end
join_force?(force_class)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 23 def join_force?(force_class) force_class == VariableForce end
on_until(node)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 36 def on_until(node) while_or_until(node) if node.condition.falsey_literal? end
Also aliased as: on_until_post
on_while(node)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 32 def on_while(node) while_or_until(node) if node.condition.truthy_literal? end
Also aliased as: on_while_post
Private Instance Methods
assigned_before_loop?(var, range)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 76 def assigned_before_loop?(var, range) b = range.begin_pos var.assignments.any? { |a| a.node.source_range.end_pos < b } end
assigned_inside_loop?(var, range)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 72 def assigned_inside_loop?(var, range) var.assignments.any? { |a| range.contains?(a.node.source_range) } end
configured_indent()
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# File lib/rubocop/cop/style/infinite_loop.rb, line 121 def configured_indent ' ' * config.for_cop('IndentationWidth')['Width'] end
modifier_replacement(node)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 99 def modifier_replacement(node) if node.single_line? 'loop { ' + node.body.source + ' }' else indentation = node.body.loc.expression.source_line[LEADING_SPACE] ['loop do', node.body.source.gsub(/^/, configured_indent), 'end'].join("\n#{indentation}") end end
non_modifier_range(node)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 110 def non_modifier_range(node) start_range = node.loc.keyword.begin end_range = if node.do? node.loc.begin.end else node.condition.source_range.end end start_range.join(end_range) end
referenced_after_loop?(var, range)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 81 def referenced_after_loop?(var, range) e = range.end_pos var.references.any? { |r| r.node.source_range.begin_pos > e } end
replace_begin_end_with_modifier(node)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 86 def replace_begin_end_with_modifier(node) lambda do |corrector| corrector.replace(node.body.loc.begin, 'loop do') corrector.remove(node.body.loc.end.end.join(node.source_range.end)) end end
replace_source(range, replacement)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 93 def replace_source(range, replacement) lambda do |corrector| corrector.replace(range, replacement) end end
while_or_until(node)
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# File lib/rubocop/cop/style/infinite_loop.rb, line 55 def while_or_until(node) range = node.source_range # Not every `while true` and `until false` can be turned into a # `loop do` without further modification. The reason is that a # variable that's introduced inside a while/until loop is in scope # outside of that loop too, but a variable that's assigned for the # first time inside a block can not be accessed after the block. In # those more complicated cases we don't report an offense. return if @variables.any? do |var| assigned_inside_loop?(var, range) && !assigned_before_loop?(var, range) && referenced_after_loop?(var, range) end add_offense(node, location: :keyword) end