class RuboCop::Cop::VariableForce::Variable
A Variable represents existence of a local variable. This holds a variable declaration node, and some states of the variable.
Constants
- VARIABLE_DECLARATION_TYPES
Attributes
assignments[R]
captured_by_block[R]
captured_by_block?[R]
declaration_node[R]
name[R]
references[R]
scope[R]
Public Class Methods
new(name, declaration_node, scope)
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# File lib/rubocop/cop/variable_force/variable.rb, line 16 def initialize(name, declaration_node, scope) unless VARIABLE_DECLARATION_TYPES.include?(declaration_node.type) raise ArgumentError, "Node type must be any of #{VARIABLE_DECLARATION_TYPES}, " \ "passed #{declaration_node.type}" end @name = name.to_sym @declaration_node = declaration_node @scope = scope @assignments = [] @references = [] @captured_by_block = false end
Public Instance Methods
argument?()
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# File lib/rubocop/cop/variable_force/variable.rb, line 80 def argument? ARGUMENT_DECLARATION_TYPES.include?(@declaration_node.type) end
assign(node)
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# File lib/rubocop/cop/variable_force/variable.rb, line 32 def assign(node) @assignments << Assignment.new(node, self) end
block_argument?()
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# File lib/rubocop/cop/variable_force/variable.rb, line 88 def block_argument? argument? && @scope.node.block_type? end
capture_with_block!()
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# File lib/rubocop/cop/variable_force/variable.rb, line 60 def capture_with_block! @captured_by_block = true end
explicit_block_local_variable?()
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# File lib/rubocop/cop/variable_force/variable.rb, line 96 def explicit_block_local_variable? @declaration_node.shadowarg_type? end
keyword_argument?()
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# File lib/rubocop/cop/variable_force/variable.rb, line 92 def keyword_argument? %i[kwarg kwoptarg].include?(@declaration_node.type) end
method_argument?()
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# File lib/rubocop/cop/variable_force/variable.rb, line 84 def method_argument? argument? && %i[def defs].include?(@scope.node.type) end
reference!(node)
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# File lib/rubocop/cop/variable_force/variable.rb, line 40 def reference!(node) reference = Reference.new(node, @scope) @references << reference consumed_branches = Set.new @assignments.reverse_each do |assignment| next if consumed_branches.include?(assignment.branch) unless assignment.run_exclusively_with?(reference) assignment.reference! end break if !assignment.branch || assignment.branch == reference.branch unless assignment.branch.may_run_incompletely? consumed_branches << assignment.branch end end end
referenced?()
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# File lib/rubocop/cop/variable_force/variable.rb, line 36 def referenced? !@references.empty? end
should_be_unused?()
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# File lib/rubocop/cop/variable_force/variable.rb, line 76 def should_be_unused? name.to_s.start_with?('_') end
used?()
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This is a convenient way to check whether the variable is used in its entire variable lifetime. For more precise usage check, refer RuboCop::Cop::VariableForce::Assignment#used?.
Once the variable is captured by a block, we have no idea when, where and how many times the block would be invoked and it means we cannot track the usage of the variable. So we consider it's used to suppress false positive offenses.
# File lib/rubocop/cop/variable_force/variable.rb, line 72 def used? @captured_by_block || referenced? end