#     Copyright 2025, Kay Hayen, mailto:kay.hayen@gmail.com find license text at end of file


""" Cover list contractions and a few special things in them.

"""

from __future__ import print_function

# Tests do bad things, pylint: disable=possibly-unused-variable,redefined-outer-name


def displayDict(d):
    result = "{"
    first = True
    for key, value in sorted(d.items()):
        if not first:
            result += ","

        result += "%s: %s" % (repr(key), repr(value))
        first = False
    result += "}"

    return result


print("List contraction on the module level:")
x = [(u if u % 2 == 0 else 0) for u in range(10)]
print(x)

print("List contraction on the function level:")


def someFunction():
    x = [(u if u % 2 == 0 else 0) for u in range(10)]
    print(x)


someFunction()

print("List contractions with no, 1 one 2 conditions:")


def otherFunction():
    print([x for x in range(8)])
    print([x for x in range(8) if x % 2 == 1])
    print([x for x in range(8) if x % 2 == 1 if x > 4])


otherFunction()

print("Complex list contractions with more than one for:")


def complexContractions():
    print([(x, y) for x in range(3) for y in range(5)])

    seq = range(3)
    res = [(i, j, k) for i in iter(seq) for j in iter(seq) for k in iter(seq)]

    print(res)


complexContractions()

print("Contraction for 2 for statements and one final if referring to first for:")


def trickyContraction():
    class Range:
        def __init__(self, value):
            self.value = value

        def __iter__(self):
            print("Giving range iter to", self.value)

            return iter(range(self.value))

    def Cond(y):
        print("Checking against", y)

        return y == 1

    r = [(x, z, y) for x in Range(3) for z in Range(2) for y in Range(4) if Cond(y)]
    print("result is", r)


trickyContraction()


def lambdaWithcontraction(x):
    l = lambda x: [z for z in range(x)]
    r = l(x)

    print("Lambda contraction locals:", displayDict(locals()))


lambdaWithcontraction(3)

print("Contraction that gets a 'del' on the iterator variable:", end=" ")


def allowedDelOnIteratorVariable(z):
    x = 2
    del x
    return [x * z for x in range(z)]


print(allowedDelOnIteratorVariable(3))

#     Python tests originally created or extracted from other peoples work. The
#     parts were too small to be protected.
#
#     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.
