def __init__(self, builder):
"""Initialization for builder handler.
Args:
builder: Instance of Builder class.
Raises:
ListenerConfigurationError when builder is not a Builder class.
"""
if not isinstance(builder, Builder):
raise yaml_errors.ListenerConfigurationError(
'Must provide builder of type yaml_listener.Builder')
self._builder = builder
self._stack = None
self._top = None
self._results = []
def __init__(self, event_handler):
"""Initialize PyYAML event listener.
Constructs internal mapping directly from event type to method on actual
handler. This prevents reflection being used during actual parse time.
Args:
event_handler: Event handler that will receive mapped events. Must
implement at least one appropriate handler method named from
the values of the _EVENT_METHOD_MAP.
Raises:
ListenerConfigurationError if event_handler is not an EventHandler.
"""
if not isinstance(event_handler, EventHandler):
raise yaml_errors.ListenerConfigurationError(
'Must provide event handler of type yaml_listener.EventHandler')
self._event_method_map = {}
# For each event type in default method map...
for event, method in _EVENT_METHOD_MAP.items():
# Map event class to actual method
self._event_method_map[event] = getattr(event_handler, method)
