Expand Up @@ -19,6 +19,7 @@
import re import warnings from functools import lru_cache from typing import TYPE_CHECKING, SupportsInt
try: Expand Down Expand Up @@ -1667,10 +1668,8 @@ def get_week_number(self, day_of_period: int, day_of_week: int | None = None) -> #: in order of decreasing magnitude. PATTERN_CHAR_ORDER = "GyYuUQqMLlwWdDFgEecabBChHKkjJmsSAzZOvVXx"
_pattern_cache = {}

def parse_pattern(pattern: str) -> DateTimePattern: def parse_pattern(pattern: str | DateTimePattern) -> DateTimePattern: """Parse date, time, and datetime format patterns.
>>> parse_pattern("MMMMd").format Expand All @@ -1693,10 +1692,11 @@ def parse_pattern(pattern: str) -> DateTimePattern: """ if isinstance(pattern, DateTimePattern): return pattern return _cached_parse_pattern(pattern)
if pattern in _pattern_cache: return _pattern_cache[pattern]
@lru_cache(maxsize=1024) def _cached_parse_pattern(pattern: str) -> DateTimePattern: result = []
for tok_type, tok_value in tokenize_pattern(pattern): Expand All @@ -1710,9 +1710,7 @@ def parse_pattern(pattern: str) -> DateTimePattern: result.append('%%(%s)s' % (fieldchar * fieldnum)) else: raise NotImplementedError(f"Unknown token type: {tok_type}")
_pattern_cache[pattern] = pat = DateTimePattern(pattern, ''.join(result)) return pat return DateTimePattern(pattern, ''.join(result))

def tokenize_pattern(pattern: str) -> list[tuple[str, str | tuple[str, int]]]: Expand Down