from pyramid.compat import string_types
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truthy = frozenset(('t', 'true', 'y', 'yes', 'on', '1'))
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falsey = frozenset(('f', 'false', 'n', 'no', 'off', '0'))
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def asbool(s):
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""" Return the boolean value ``True`` if the case-lowered value of string
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input ``s`` is a :term:`truthy string`. If ``s`` is already one of the
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boolean values ``True`` or ``False``, return it."""
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if s is None:
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return False
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if isinstance(s, bool):
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return s
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s = str(s).strip()
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return s.lower() in truthy
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def aslist_cronly(value):
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if isinstance(value, string_types):
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value = filter(None, [x.strip() for x in value.splitlines()])
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return list(value)
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def aslist(value, flatten=True):
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""" Return a list of strings, separating the input based on newlines
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and, if flatten=True (the default), also split on spaces within
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each line."""
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values = aslist_cronly(value)
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if not flatten:
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return values
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result = []
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for value in values:
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subvalues = value.split()
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result.extend(subvalues)
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return result
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