Method: PgQuery::ParserResult#walk!

Defined in:
lib/pg_query/treewalker.rb

#walk!(&block) ⇒ Object

Walks the parse tree and calls the passed block for each contained node

If you pass a block with 1 argument, you will get each node. If you pass a block with 4 arguments, you will get each parent_node, parent_field, node and location.

Location uniquely identifies a given node within the parse tree. This is a stable identifier across multiple parser runs, assuming the same pg_query release and no modifications to the parse tree.



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# File 'lib/pg_query/treewalker.rb', line 10

def walk!(&block)
  if block.arity == 1
    treewalker!(@tree) do |_, _, node, _|
      yield(node)
    end
  else
    treewalker!(@tree) do |parent_node, parent_field, node, location|
      yield(parent_node, parent_field, node, location)
    end
  end
end