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yel_predicates.py
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yel_predicates.py
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import collections
def is_int(value, param=None):
return isinstance(value, int)
def is_float(value, param=None):
return isinstance(value, float)
def is_number(value, param=None):
return is_int(value) or is_float(value)
def is_str(value, param=None):
return isinstance(value, str)
def is_bool(value, param=None):
return isinstance(value, bool)
def is_map(data):
return isinstance(data, collections.Mapping)
def is_seq(data):
return isinstance(data, collections.Iterable) and not isinstance(data, str)
def is_sized(value, param=None):
return isinstance(value, collections.Sized)
def is_empty(value, param=None):
return is_sized(value) and len(value) == 0
def is_zero(value, param=None):
return value == 0 or value == 0.0
def is_even(value, param=None):
return is_number(value) and value % 2 == 0
def is_odd(value, param=None):
return is_number(value) and not is_even(value)
def is_nil(value, param=None):
return value is None
def is_not_nil(value, param=None):
return value is not None
def is_eq(value, param=None):
return value == param
def is_ne(value, param=None):
return value != param
def is_ge(value, param=None):
return value >= param
def is_le(value, param=None):
return value <= param
def is_gt(value, param=None):
return value > param
def is_lt(value, param=None):
return value < param
def is_truthy(value, param=None):
return bool(value)
def is_falsy(value, param=None):
return not bool(value)
PREDICATES = {
"nil?": is_nil,
"int?": is_int,
"float?": is_float,
"number?": is_number,
"str?": is_str,
"bool?": is_bool,
"map?": is_map,
"seq?": is_seq,
"sized?": is_sized,
"empty?": is_empty,
"zero?": is_zero,
"even?": is_even,
"odd?": is_odd,
"eq?": is_eq,
"true?": is_truthy,
"false?": is_falsy,
"eq": is_eq,
"ne": is_ne,
"gt": is_gt,
"lt": is_lt,
"ge": is_ge,
"le": is_le
}
for name, predicate in PREDICATES.items():
PREDICATES["not-" + name] = lambda x: not predicate(x)