Class: RBS::Prototype::NodeUsage

Inherits:
Object
  • Object
show all
Includes:
Helpers
Defined in:
lib/rbs/prototype/node_usage.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(node) ⇒ NodeUsage

Returns a new instance of NodeUsage.



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# File 'lib/rbs/prototype/node_usage.rb', line 10

def initialize(node)
  @node = node
  @conditional_nodes = Set[].compare_by_identity

  calculate(node, conditional: false)
end

Instance Attribute Details

#conditional_nodes ⇒ Object (readonly)

Returns the value of attribute conditional_nodes.



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# File 'lib/rbs/prototype/node_usage.rb', line 8

def conditional_nodes
  @conditional_nodes
end

Instance Method Details

#calculate(node, conditional:) ⇒ Object 



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# File 'lib/rbs/prototype/node_usage.rb', line 25

def calculate(node, conditional:)
  if conditional
    conditional_nodes << node
  end

  case node.type
  when :IF, :UNLESS
    cond_node, true_node, false_node = node.children
    calculate(cond_node, conditional: true)
    calculate(true_node, conditional: conditional) if true_node
    calculate(false_node, conditional: conditional) if false_node
  when :AND, :OR
    left, right = node.children
    calculate(left, conditional: true)
    calculate(right, conditional: conditional)
  when :QCALL
    receiver, _, args = node.children
    calculate(receiver, conditional: true)
    calculate(args, conditional: false) if args
  when :WHILE
    cond, body = node.children
    calculate(cond, conditional: true)
    calculate(body, conditional: false) if body
  when :OP_ASGN_OR, :OP_ASGN_AND
    var, _, asgn = node.children
    calculate(var, conditional: true)
    calculate(asgn, conditional: conditional)
  when :LASGN, :IASGN, :GASGN
    _, lhs = node.children
    calculate(lhs, conditional: conditional) if lhs
  when :MASGN
    lhs, _ = node.children
    calculate(lhs, conditional: conditional)
  when :CDECL
    if node.children.size == 2
      _, lhs = node.children
      calculate(lhs, conditional: conditional)
    else
      const, _, lhs = node.children
      calculate(const, conditional: false)
      calculate(lhs, conditional: conditional)
    end
  when :SCOPE
    _, _, body = node.children
    calculate(body, conditional: conditional)
  when :CASE2
    _, *branches = node.children
    branches.each do |branch|
      if branch.type == :WHEN
        list, body = branch.children
        list.children.each do |child|
          if child
            calculate(child, conditional: true)
          end
        end
        calculate(body, conditional: conditional)
      else
        calculate(branch, conditional: conditional)
      end
    end
  when :BLOCK
    *nodes, last = node.children
    nodes.each do |no|
      calculate(no, conditional: false)
    end
    calculate(last, conditional: conditional) if last
  else
    each_child(node) do |child|
      calculate(child, conditional: false)
    end
  end
end

#each_conditional_node(&block) ⇒ Object 



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# File 'lib/rbs/prototype/node_usage.rb', line 17

def each_conditional_node(&block)
  if block
    conditional_nodes.each(&block)
  else
    conditional_nodes.each
  end
end