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# Copyright (c) 2015 Mirantis, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from yaql.language import exceptions
from yaql.language import specs
import yaql.tests
class TestSystem(yaql.tests.TestCase):
def test_def(self):
self.assertEqual(
[1, 4, 9],
self.eval('def(sq, $*$) -> $.select(sq($))', data=[1, 2, 3]))
self.assertEqual(
[1, 4, 9],
self.eval('def(sq, $arg * $arg) -> $.select(sq(arg => $))',
data=[1, 2, 3]))
def test_def_recursion(self):
self.assertEqual(24, self.eval(
'def(rec, switch($ = 1 => 1, true => $*rec($-1))) -> rec($)',
data=4))
def test_elvis_dict(self):
self.assertEqual(1, self.eval('$?.a', data={'a': 1}))
self.assertIsNone(self.eval('$?.a', data=None))
def test_elvis_method(self):
self.assertEqual([2, 3], self.eval('$?.select($+1)', data=[1, 2]))
self.assertIsNone(self.eval('$?.select($+1)', data=None))
def test_unpack(self):
self.assertEqual(
5, self.eval('[2, 3].unpack() -> $1 + $2'))
def test_unpack_with_names(self):
self.assertEqual(
5, self.eval('[2, 3].unpack(a, b) -> $a + $b'))
self.assertRaises(
ValueError,
self.eval, '[2, 3].unpack(a, b, c) -> $a + $b')
self.assertRaises(
ValueError,
self.eval, '[2, 3].unpack(a) -> $a')
def test_assert(self):
self.assertEqual(
[3, 4],
self.eval('[2, 3].assert(len($) > 1).select($ + 1)'))
self.assertRaises(
AssertionError,
self.eval, '[2].assert(len($) > 1).select($ + 1)')
self.assertEqual(
3,
self.eval('[2].select($ + 1).assert(len($) = 1).first()'))
def test_lambda_passing(self):
delegate = lambda x: x ** 2 # noqa: E731
self.assertEqual(
9,
self.eval('$(3)', data=delegate))
def test_calling_non_callable(self):
self.assertRaises(
exceptions.NoMatchingFunctionException,
self.eval, '$(a)', data={'a': 9})
def test_function_passing(self):
def func(x, y, z):
return (x - y) * z
context = self.context
context['func'] = func
self.assertEqual(
8,
self.eval('$func(5, z => 2, y => 1)', data=func))
def test_lambda_expression(self):
delegate = lambda x: x ** 2 # noqa: E731
self.assertEqual(
9,
self.eval('$.x[0](3)', data={'x': [delegate]}))
self.assertEqual(
9,
self.eval('($.x[0])(3)', data={'x': [delegate]}))
def test_2nd_order_lambda(self):
delegate = lambda y: lambda x: x ** y # noqa: E731
self.assertEqual(
16,
self.eval('$(2)(4)', data=delegate))
def test_2nd_order_lambda_expression(self):
delegate = lambda y: {'key': lambda x: x ** y} # noqa: E731
self.assertEqual(
16,
self.eval('$(2)[key](4)', data=delegate))
def test_2nd_order_lambda_collection_expression(self):
delegate = lambda y: lambda x: y ** x # noqa: E731
self.assertEqual(
[1, 8, 27],
self.eval(
'let(func => $) -> [1, 2, 3].select($func($)).select($(3))',
data=delegate))
def test_lambda_func(self):
self.assertEqual(
[2, 4, 6],
self.eval('let(func => lambda(2 * $)) -> $.select($func($))',
data=[1, 2, 3]))
def test_lambda_func_2nd_order(self):
self.assertEqual(
5,
self.eval('lambda(let(outer => $) -> lambda($outer - $))(7)(2)'))
def test_lambda_closure(self):
data = [1, 2, 3, 4, 5, 6]
self.assertEqual([3, 4, 5, 6], self.eval(
'$.where(lambda($ > 3)($+1))',
data=data))
# lambda can access value from "where"'s context
# so we can omit parameter
self.assertEqual([4, 5, 6], self.eval(
'$.where(lambda($ > 3)())',
data=data))
def test_properties(self):
@specs.yaql_property(int)
def neg_value(value):
return -value
self.context.register_function(neg_value)
self.assertEqual(-123, self.eval('123.negValue'))
self.assertRaises(exceptions.NoMatchingFunctionException,
self.eval, '"123".negValue')
self.assertRaises(exceptions.NoMatchingFunctionException,
self.eval, 'null.negValue')
self.assertRaises(exceptions.NoFunctionRegisteredException,
self.eval, '123.neg_value')
def test_call_function(self):
self.assertEqual(
2,
self.eval('call(len, [[1,2]], {})'))
self.assertEqual(
2,
self.eval('call(len, [], {"sequence" => [1,2]})'))
self.assertRaises(
exceptions.NoMatchingFunctionException,
self.eval, 'call(len, [[1,2]], null)')
self.assertRaises(
exceptions.NoMatchingFunctionException,
self.eval, 'call(len, null, {sequence => [1,2]})')
self.assertRaises(
exceptions.NoMatchingFunctionException,
self.eval, 'call(len, [], {invalid => [1,2]})')
self.assertRaises(
exceptions.NoMatchingFunctionException,
self.eval, 'call(len, [1, 2], {})')
self.assertTrue(self.eval('call(isEmpty, [null], {})'))
def test_call_method(self):
self.assertEqual(
2,
self.eval('call(len, [], {}, [1,2])'))
self.assertRaises(
exceptions.NoMatchingMethodException,
self.eval, 'call(len, [[1,2]], {}, [1,2])')
self.assertRaises(
exceptions.NoMatchingMethodException,
self.eval, 'call(len, [], {sequence => [1,2]}, [1, 2])')
self.assertRaises(
exceptions.NoMatchingFunctionException,
self.eval, 'call(len, [], null, [1, 2])')
self.assertRaises(
exceptions.NoMatchingFunctionException,
self.eval, 'call(len, null, {sequence => [1,2]}, [1, 2])')
self.assertTrue(self.eval('call(isEmpty, [], {}, null)'))
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