Function compile

pattern/text/search.py:868–885

Returns a Pattern from the given string or regular expression. Recently compiled patterns are kept in cache.

(pattern, *args, **kwargs)

_cache = {}
_CACHE_SIZE = 100 # Number of dynamic Pattern objects to keep in cache.
def compile(pattern, *args, **kwargs):
    """ Returns a Pattern from the given string or regular expression.
        Recently compiled patterns are kept in cache.
    """
    id, p = repr(pattern)+repr(args), None
    if id in _cache:
        return _cache[id]
    if isinstance(pattern, basestring):
        p = Pattern.fromstring(pattern, *args, **kwargs)
    if isinstance(pattern, regexp):
        p = Pattern([Constraint(words=[pattern], taxonomy=kwargs.get("taxonomy", TAXONOMY))], *args, **kwargs)
    if len(_cache) > _CACHE_SIZE:
        _cache.clear()
    if isinstance(p, Pattern):
        _cache[id] = p
        return p
    else:
        raise TypeError, "can't compile '%s' object" % pattern.__class__.__name__

def match(pattern, sentence, *args, **kwargs):
    """ Returns the first match found in the given sentence, or None.