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# -*- coding: utf-8 -*-
"""
jinja2.tests
~~~~~~~~~~~~
Jinja test functions. Used with the "is" operator.
:copyright: (c) 2017 by the Jinja Team.
:license: BSD, see LICENSE for more details.
"""
import re
from collections import Mapping
from jinja2.runtime import Undefined
from jinja2._compat import text_type, string_types, integer_types
import decimal
number_re = re.compile(r'^-?\d+(\.\d+)?$')
regex_type = type(number_re)
test_callable = callable
def test_odd(value):
"""Return true if the variable is odd."""
return value % 2 == 1
def test_even(value):
"""Return true if the variable is even."""
return value % 2 == 0
def test_divisibleby(value, num):
"""Check if a variable is divisible by a number."""
return value % num == 0
def test_defined(value):
"""Return true if the variable is defined:
.. sourcecode:: jinja
{% if variable is defined %}
value of variable: {{ variable }}
{% else %}
variable is not defined
{% endif %}
See the :func:`default` filter for a simple way to set undefined
variables.
"""
return not isinstance(value, Undefined)
def test_undefined(value):
"""Like :func:`defined` but the other way round."""
return isinstance(value, Undefined)
def test_none(value):
"""Return true if the variable is none."""
return value is None
def test_lower(value):
"""Return true if the variable is lowercased."""
return text_type(value).islower()
def test_upper(value):
"""Return true if the variable is uppercased."""
return text_type(value).isupper()
def test_string(value):
"""Return true if the object is a string."""
return isinstance(value, string_types)
def test_mapping(value):
"""Return true if the object is a mapping (dict etc.).
.. versionadded:: 2.6
"""
return isinstance(value, Mapping)
def test_number(value):
"""Return true if the variable is a number."""
return isinstance(value, integer_types + (float, complex, decimal.Decimal))
def test_sequence(value):
"""Return true if the variable is a sequence. Sequences are variables
that are iterable.
"""
try:
len(value)
value.__getitem__
except:
return False
return True
def test_equalto(value, other):
"""Check if an object has the same value as another object:
.. sourcecode:: jinja
{% if foo.expression is equalto 42 %}
the foo attribute evaluates to the constant 42
{% endif %}
This appears to be a useless test as it does exactly the same as the
``==`` operator, but it can be useful when used together with the
`selectattr` function:
.. sourcecode:: jinja
{{ users|selectattr("email", "equalto", "foo@bar.invalid") }}
.. versionadded:: 2.8
"""
return value == other
def test_sameas(value, other):
"""Check if an object points to the same memory address than another
object:
.. sourcecode:: jinja
{% if foo.attribute is sameas false %}
the foo attribute really is the `False` singleton
{% endif %}
"""
return value is other
def test_iterable(value):
"""Check if it's possible to iterate over an object."""
try:
iter(value)
except TypeError:
return False
return True
def test_escaped(value):
"""Check if the value is escaped."""
return hasattr(value, '__html__')
def test_greaterthan(value, other):
"""Check if value is greater than other."""
return value > other
def test_lessthan(value, other):
"""Check if value is less than other."""
return value < other
TESTS = {
'odd': test_odd,
'even': test_even,
'divisibleby': test_divisibleby,
'defined': test_defined,
'undefined': test_undefined,
'none': test_none,
'lower': test_lower,
'upper': test_upper,
'string': test_string,
'mapping': test_mapping,
'number': test_number,
'sequence': test_sequence,
'iterable': test_iterable,
'callable': test_callable,
'sameas': test_sameas,
'equalto': test_equalto,
'escaped': test_escaped,
'greaterthan': test_greaterthan,
'lessthan': test_lessthan
}
|
