old_contents: ###############################################################################
  #
  # Copyright (c) 2011 Ruslan Spivak
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  # THE SOFTWARE.
  #
  ###############################################################################
  
  __author__ = 'Ruslan Spivak <ruslan.spivak@gmail.com>'
  
  
  class ASTVisitor(object):
      """Base class for custom AST node visitors.
  
      Example:
  
      class MyVisitor(ASTVisitor):
          def visit_Object(self, node):
              '''Visit object literal.'''
              for prop in node:
                  left, right = prop.left, prop.right
                  print 'Property value: %s' % right.value
                  # visit all children in turn
                  self.visit(prop)
      """
  
      def visit(self, node):
          method = 'visit_%s' % node.__class__.__name__
          return getattr(self, method, self.generic_visit)(node)
  
      def generic_visit(self, node):
          for child in node:
              self.visit(child)
  
  
  class NodeVisitor(object):
      """Simple node visitor."""
  
      def visit(self, node):
          """Returns a generator that walks all children recursively."""
          for child in node:
              yield child
              for subchild in self.visit(child):
                  yield subchild
  
  
  def visit(node):
      visitor = NodeVisitor()
      for child in visitor.visit(node):
          yield child
  
new_contents: ###############################################################################
  #
  # Copyright (c) 2011 Ruslan Spivak
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  # THE SOFTWARE.
  #
  ###############################################################################
  
  __author__ = 'Ruslan Spivak <ruslan.spivak@gmail.com>'
  
  
  class ASTVisitor(object):
      """Base class for custom AST node visitors.
  
      Example:
  
      >>> from slimit.parser import Parser
      >>> from slimit.visitors.nodevisitor import ASTVisitor
      >>>
      >>> text = '''
      ... var x = {
      ...     "key1": "value1",
      ...     "key2": "value2"
      ... };
      ... '''
      >>>
      >>> class MyVisitor(ASTVisitor):
      ...     def visit_Object(self, node):
      ...         '''Visit object literal.'''
      ...         for prop in node:
      ...             left, right = prop.left, prop.right
      ...             print 'Property value: %s' % right.value
      ...             # visit all children in turn
      ...             self.visit(prop)
      ...
      >>>
      >>> parser = Parser()
      >>> tree = parser.parse(text)
      >>> visitor = MyVisitor()
      >>> visitor.visit(tree)
      Property value: "value1"
      Property value: "value2"
  
      """
  
      def visit(self, node):
          method = 'visit_%s' % node.__class__.__name__
          return getattr(self, method, self.generic_visit)(node)
  
      def generic_visit(self, node):
          for child in node:
              self.visit(child)
  
  
  class NodeVisitor(object):
      """Simple node visitor."""
  
      def visit(self, node):
          """Returns a generator that walks all children recursively."""
          for child in node:
              yield child
              for subchild in self.visit(child):
                  yield subchild
  
  
  def visit(node):
      visitor = NodeVisitor()
      for child in visitor.visit(node):
          yield child
  
subject: Add an example how to parse object literals