| """Functions related to CEL language operations. | |
| """ | |
| def _merge(*expressions): | |
| """Merge CEL expressions together with && clause. | |
| Args: | |
| *expressions: expressions to merge | |
| Returns: | |
| merged expression or None if there's no args | |
| """ | |
| clauses = [] | |
| for exp in expressions: | |
| if exp not in clauses: | |
| clauses.append(exp) | |
| if not clauses: | |
| return None | |
| clause_expr = "({})" | |
| return " && ".join( | |
| [ | |
| clause_expr.format(clause) | |
| for clause in clauses | |
| ], | |
| ) | |
| cel = struct( | |
| merge = _merge, | |
| ) |