Class: RBI::Rewriters::Merge::TreeMerger

Inherits:
Visitor
  • Object
show all
Extended by:
T::Sig
Defined in:
lib/rbi/rewriters/merge_trees.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Visitor

#visit_all

Constructor Details

#initialize(output, left_name: "left", right_name: "right", keep: Keep::NONE) ⇒ TreeMerger

Returns a new instance of TreeMerger.



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# File 'lib/rbi/rewriters/merge_trees.rb', line 101

def initialize(output, left_name: "left", right_name: "right", keep: Keep::NONE)
  super()
  @tree = output
  @index = T.let(output.index, Index)
  @scope_stack = T.let([@tree], T::Array[Tree])
  @left_name = left_name
  @right_name = right_name
  @keep = keep
  @conflicts = T.let([], T::Array[Conflict])
end

Instance Attribute Details

#conflicts ⇒ Object (readonly)

Returns the value of attribute conflicts.



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# File 'lib/rbi/rewriters/merge_trees.rb', line 98

def conflicts
  @conflicts
end

Instance Method Details

#visit(node) ⇒ Object 



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# File 'lib/rbi/rewriters/merge_trees.rb', line 113

def visit(node)
  return unless node

  case node
  when Scope
    prev = previous_definition(node)

    if prev.is_a?(Scope)
      if node.compatible_with?(prev)
        prev.merge_with(node)
      elsif @keep == Keep::LEFT
        # do nothing it's already merged
      elsif @keep == Keep::RIGHT
        prev = replace_scope_header(prev, node)
      else
        make_conflict_scope(prev, node)
      end
      @scope_stack << prev
    else
      copy = node.dup_empty
      current_scope << copy
      @scope_stack << copy
    end
    visit_all(node.nodes)
    @scope_stack.pop
  when Tree
    current_scope.merge_with(node)
    visit_all(node.nodes)
  when Indexable
    prev = previous_definition(node)
    if prev
      if node.compatible_with?(prev)
        prev.merge_with(node)
      elsif @keep == Keep::LEFT
        # do nothing it's already merged
      elsif @keep == Keep::RIGHT
        prev.replace(node)
      else
        make_conflict_tree(prev, node)
      end
    else
      current_scope << node.dup
    end
  end
end