| """MiniGrid v1 grammar and native policy action IDs (drop/done are not actions).""" |
|
|
| import re |
| from dataclasses import dataclass |
|
|
| ACTIONS = {"left": 0, "right": 1, "forward": 2, "pickup": 3, "toggle": 5} |
| _ASCII_LOWER = str.maketrans("ABCDEFGHIJKLMNOPQRSTUVWXYZ", "abcdefghijklmnopqrstuvwxyz") |
|
|
|
|
| def normalize_action(action): |
| normalized = str(action).strip().translate(_ASCII_LOWER) |
| if normalized not in ACTIONS: |
| raise ValueError("MiniGrid action must be left, right, forward, pickup, or toggle") |
| return normalized |
|
|
|
|
| @dataclass(frozen=True) |
| class ParsedAction: |
| action: str | None |
| reason: str = "" |
| attempted_action: str = "unavailable" |
|
|
| @property |
| def valid(self): |
| return self.action is not None |
|
|
|
|
| def parse_response(response, *, hit_limit=False): |
| |
| text = str(response) |
| blocks = re.findall(r"<action>(.*?)</action>", text, re.S) |
| attempted = "unavailable" |
| if len(blocks) == 1 and text.count("<action>") == text.count("</action>") == 1: |
| try: |
| attempted = normalize_action(blocks[0]) |
| except ValueError: |
| pass |
| reason = "" |
| tags = ("<think>", "</think>", "<action>", "</action>") |
| if hit_limit and not blocks: |
| reason = "truncated_action" |
| elif any(text.count(tag) > 1 for tag in tags): |
| reason = "multiple_blocks" |
| elif not all(tag in text for tag in tags[:2]): |
| reason = "missing_think_block" |
| elif not all(tag in text for tag in tags[2:]): |
| reason = "missing_action_block" |
| else: |
| match = re.fullmatch(r"\s*<think>(.*?)</think>\s*<action>(.*?)</action>\s*", text, re.S) |
| if match is None or any(tag in match[1] or tag in match[2] for tag in tags): |
| reason = "malformed_format" |
| else: |
| payload = match[2].strip().translate(_ASCII_LOWER) |
| if payload in ACTIONS: |
| return ParsedAction(payload, attempted_action=payload) |
| words = re.findall("[a-z]+", payload) |
| reason = "multiple_actions" if sum(word in ACTIONS for word in words) >= 2 else "unsupported_action" |
| return ParsedAction(None, reason, attempted) |
|
|
