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Cache 'redbaron_classname_to_baron_type', giving ~30% performance boost on 'find_all' heavy code. #158

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Cache 'redbaron_classname_to_baron_type', giving ~30% performance boost on 'find_all' heavy code. #158

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3 changes: 2 additions & 1 deletion redbaron/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,8 @@
def baron_type_to_redbaron_classname(baron_type):
return "".join(map(lambda x: x.capitalize(), baron_type.split("_"))) + "Node"


from functools import lru_cache
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Imports should be top level

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functools.lru_cache is python3 only and will not work in python2. It might be easy to write a cache decorator with no max size:

def memoize(function):
    memo = {}

    @wraps(function)
    def wrapper(*args):
        if args in memo:
            return memo[args]
        else:
            rv = function(*args)
            memo[args] = rv
            return rv
    return wrapper

@lru_cache(maxsize=None)
def redbaron_classname_to_baron_type(name):
name = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name.replace("Node", ""))
return re.sub('([a-z0-9])([A-Z])', r'\1_\2', name).lower()
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