def _decomposer(self, event: Union[str, Tuple], suffix_tree: SuffixTree):
"""To generate suffix tree depending on the conditional event."""
operation_and_list = ["&&", "AND"]
operation_or_list = ["||", "OR"]
# Check it is unit conditional event(str) or conditional event(tuple).
if isinstance(event, str):
self._unit_event_syntax_check(event)
self._unit_event_message_dict[event] = []
suffix_tree.value = event
elif isinstance(event, tuple):
if event[-1] in operation_and_list:
suffix_tree.value = Operation.AND
elif event[-1] in operation_or_list:
suffix_tree.value = Operation.OR
else:
raise ConditionalEventSyntaxError(
"The last of the conditional event tuple must be one of ['AND', 'OR', '&&', '||]"
)
for slot in event[:-1]:
node = SuffixTree()
if isinstance(slot, tuple):
self._decomposer(slot, node)
else:
self._unit_event_syntax_check(slot)
self._unit_event_message_dict[slot] = []
node.value = slot
suffix_tree.nodes.append(node)
else:
raise ConditionalEventSyntaxError(
"Conditional event should be string or tuple.")
def _unit_event_syntax_check(self, unit_event: str):
"""
To check unit conditional event expression.
Rules:
unit event must be three parts and divided by ':',
the first part of unit event represent the message's source,
i.e. 'learner' or '*'
the second part of unit event represent the message's type,
i.e. 'experience' or '*'
the third part of unit event represent how much messages needed,
i.e. '1' or '90%'
Do not use special symbol in the unit event, such as ',', '(', ')'.
Args:
unit_event (str): the description of the requisite messages.
"""
slots = unit_event.split(":")
if len(slots) != 3:
raise ConditionalEventSyntaxError(
f"The conditional event: {unit_event}, \
must have three parts, and divided by ':'."
)
# the third part of unit conditional event must be an integer or percentage(*%)
if slots[-1][-1] == "%":
slots[-1] = slots[-1][:-1]
try:
int(slots[-1])
except Exception as e:
raise ConditionalEventSyntaxError(
f"The third part of conditional event must be an integer or \
percentage with % in the end. {str(e)}"
)
def _unit_event_syntax_check(self, unit_event: str):
"""To check unit conditional event expression.
Args:
unit_event (str): The description of the requisite messages.
"""
slots = unit_event.split(":")
if len(slots) != 3:
raise ConditionalEventSyntaxError(
f"The conditional event: {unit_event}, must have three parts, and divided by ':'."
)
# The third part of unit conditional event must be an integer or percentage(*%).
if slots[-1][-1] == "%":
slots[-1] = slots[-1][:-1]
try:
int(slots[-1])
except Exception as e:
raise ConditionalEventSyntaxError(
f"The third part of conditional event must be an integer or percentage with % in the end. {str(e)}"
)