# depends on: method_context.rb block_environment.rb
 
##
# Stores all information about a running BlockEnvironment.
#
# A BlockContext contains a home and a BlockEnvironment in addition to a
# MethodContext.  The home points to the MethodContext that encloses the
# block which is used to find self, etc.
 
class BlockContext < MethodContext
 
  def from_eval?
    self.env.from_eval?
  end
 
  def last_match
    home.last_match
  end
 
  def last_match=(match)
    home.last_match = match
  end
 
  def nth_ref(idx)
    home.nth_ref(idx)
  end
 
  def back_ref(idx)
    home.back_ref(idx)
  end
 
  def method_scope
    @method_scope || env.home_block.method_scope
  end
 
  ##
  # Active context (instance of MethodContext) that started
  # execution of this block context.
 
  def home
    env.home
  end
 
  ##
  # Name of home method.
 
  def name
    home.name
  end
 
  ##
  # Block context has no receiver thus uses receiver from it's home method
  # context.
 
  def receiver
    home.receiver
  end
 
  ##
  # Block context has no own module thus uses module from it's home method
  # context.
 
  def method_module
    home.method_module
  end
 
  ##
  # Static scope of home method context.
 
  def current_scope
    if ss = method.staticscope
      return ss.module
    else
      home.current_scope
    end
  end
 
  ##
  # instance_eval needs alternate const behavior
 
  def __const_set__(name, value)
    const_scope = env.constant_scope.module
    const_scope.__send__(:__const_set__, name, value)
  end
end