diff options
| -rw-r--r-- | Lib/re.py | 25 |
1 files changed, 20 insertions, 5 deletions
@@ -58,20 +58,34 @@ def valid_identifier(id): # # +_cache = {} +_MAXCACHE = 20 +def _cachecompile(pattern, flags): + key = (pattern, flags) + try: + return _cache[key] + except KeyError: + pass + value = compile(pattern, flags) + if len(_cache) >= _MAXCACHE: + _cache.clear() + _cache[key] = value + return value + def match(pattern, string, flags=0): - return compile(pattern, flags).match(string) + return _cachecompile(pattern, flags).match(string) def search(pattern, string, flags=0): - return compile(pattern, flags).search(string) + return _cachecompile(pattern, flags).search(string) def sub(pattern, repl, string, count=0): - return compile(pattern).sub(repl, string, count) + return _cachecompile(pattern).sub(repl, string, count) def subn(pattern, repl, string, count=0): - return compile(pattern).subn(repl, string, count) + return _cachecompile(pattern).subn(repl, string, count) def split(pattern, string, maxsplit=0): - return compile(pattern).subn(string, maxsplit) + return _cachecompile(pattern).subn(string, maxsplit) # # @@ -1064,6 +1078,7 @@ def compile(pattern, flags=0): Label(label)] + \ stack[-1] + \ [Label(label + 1)] + max = max - 1 label = label + 2 del stack[-1] stack.append(expr) |