rpnifs/tests/tests_rpn.py

#!/usr/bin/python3
# Copyright 2020 Weber Yann
#
# This file is part of geneifs.
#
#        geneifs is free software: you can redistribute it and/or modify
#        it under the terms of the GNU General Public License as published by
#        the Free Software Foundation, either version 3 of the License, or
#        (at your option) any later version.
#
#        geneifs is distributed in the hope that it will be useful,
#        but WITHOUT ANY WARRANTY; without even the implied warranty of
#        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#        GNU General Public License for more details.
#
#        You should have received a copy of the GNU General Public License
#        along with geneifs.  If not, see <http://www.gnu.org/licenses/>.
#

import sys
import random
import math

import unittest
from unittest import skip

IMAX = (1<<64)-1

try:
    import pyrpn
except (ImportError, NameError) as e:
    print("Error importing pyrpn. Try to run make.",
          file=sys.stderr)
    raise e

class Test0RpnModule(unittest.TestCase):

    def test_init(self):
        """ RPNExpr instanciation """
        expr = pyrpn.RPNExpr("42", 2)

    def test_init_badargs(self):
        """ RPNExpr instanciation with bad arguments """
        badargs = [('', 2), (), ('ab+',), ('ab+',300), (42, 42), ('ab', '42')]
        for badarg in badargs:
           with self.assertRaises((ValueError, TypeError)):
            expr = pyrpn.RPNExpr(*badarg)

    def test_init_loop(self):
        """ Testing pyrpn.RPNExpr multiple instanciation """
        exprs = []
        for i in range(256):
            expr = pyrpn.RPNExpr("42", 2)

    def test_init_args(self):
        """ Testing pyrpn.RPNExpr instanciation with arguments """
        for argc in range(0, 256):
            with self.subTest("RPNExpr('42', %d)" % argc):
                expr = pyrpn.RPNExpr("42", argc)

    def test_init_stack_sz(self):
        """ Instanciate RPNExpr specifiing a stack_size """
        for argc in range(0,256, 8):
            for sz in range(4, 256, 2):
                with self.subTest("RPNExpr('42', %d,%d)" % (argc, sz)):
                    expr = pyrpn.RPNExpr("42", argc, sz)

    def test_op_dict(self):
        """ Testing RPNExpr.get_ops() method """
        known_ops = dict([
            ('add', '+'),
            ('sub', '-'),
            ('mul', '*'),
            ('div', '/'),
            ('mod', '%'),
            ('neg', '!'),
            ('not', '~'),
            ('and', '&'),
            ('or', '|'),
            ('xor', '^'),
            ('>>', 'r'),
            ('<<', 'l'),
            ('xchg', 'x'),
            ('dup', 'd'),
            ('pop', 'p'),
        ])
        for long, short in pyrpn.get_ops().items():
            self.assertIn(long, known_ops)
            self.assertEqual(short, known_ops[long])

    def test_rand_expr(self):
        """ Testing RPNExpr.random_expr() """
        result = {}
        counters = {'vals': 0, 'args': 0}
        all_count = 0
        for sz in range(1,64,3):
            for argc in range(1,128):
                rnd_expr = pyrpn.random_expr(argc, sz)
                #print(repr(rnd_expr))
                for tok in rnd_expr.split(' '):
                    all_count += 1
                    if len(tok) == 0:
                        continue
                    try:
                        itok = int(tok, 0)
                        counters['vals'] += 1
                        continue
                    except Exception:
                        pass
                    if tok[0] == 'A':
                        counters['args'] += 1
                    else:
                        if tok not in counters:
                            counters[tok] = 0
                        counters[tok] += 1
        all_ops = len(pyrpn.get_ops()) + 2
        entropy = 1-sum([(n/all_count)**2
                          for _, n in counters.items()])
        self.assertGreater(entropy, 1-(1/all_ops), "Low entropy !")
                

class TestRpnCompile(unittest.TestCase):

    def test_basic(self):
        """ Compile 6 7 * """
        expr = pyrpn.RPNExpr("6 7 *", 2)

    def test_base_error(self):
        """ Compile error a b + """
        with self.assertRaises(ValueError):
            expr = pyrpn.RPNExpr("a b +", 3)

    def test_various_compile(self):
        """ Compile various expressions """
        exprs = (("42 2 + * /", 0),
            ("A1 A2 A0 * + /", 3),
        )
        for expr, argc in exprs:
            res = pyrpn.RPNExpr(expr, argc)

    def test_long_code(self):
        """ Compile long expressions """
        for i in range(64,256,2):
            for j in range(256,4):
                exprs = ' '.join(['+' for _ in range(i)])
                expr = pyrpn.RPNExpr(exprs, j)
            

class TestRpnEval(unittest.TestCase):

    def test_arithm(self):
        """ Tests arithmetic ops """
        ops = [
            ('+', '+'),
            ('-', '-'),
            ('*', '*'),
            ('/', '//'),
            ('%', '%'),
            ('&', '&'),
            ('|', '|'),
            ('^', '^'),
            #('l', '<<'),
            #('r', '>>')
        ]
        for rpn_op, pyop in ops:
            with self.subTest('Testing op %s (%s)' % (rpn_op, pyop)):
                sys.stderr.write('.')
                sys.stderr.flush()
                for i in range(0x1000):
                    op1, op2 = random.randint(0,IMAX), random.randint(1,IMAX)
                    pyexpr = '%d %s %d' % (op1, pyop, op2)
                    pyval = eval(pyexpr) % (1<<64)
                    rpn_expr = "%d %d %s" % (op1, op2, rpn_op)
                    expr = pyrpn.RPNExpr(rpn_expr, 0)
                    res = expr.eval()
                    self.assertEqual(res, pyval,
                        "TEST#%d %s != %s" % (i, rpn_expr, pyexpr))

    def test_not(self):
        """ Test unary op """
        ops = [('~', '~%d'), ('!', '-%d')]
        for rpn_op, pystr in ops:
            with self.subTest("Testing op '%sX' (%s)" % (rpn_op, pystr)):
                sys.stderr.write('.')
                sys.stderr.flush()
                for i in range(0x1000):
                    op1 = random.randint(0, IMAX)
                    pyexpr = pystr % op1
                    pyval = eval(pyexpr) % (1<<64)
                    rpn_expr = '%d %s' % (op1, rpn_op)
                    expr = pyrpn.RPNExpr(rpn_expr, 0)
                    res = expr.eval()
                    self.assertEqual(res, pyval,
                        "TEST#%d %s != %s" % (i, rpn_expr, pyexpr))

    def test_div_zero(self):
        """ Test division by zeros """
        tests = ['A0 0 /', 'A0 0 %']
        for test in tests:
            with self.subTest('Testing division by zero using %s' % test):
                for i in range(10):
                    expr = pyrpn.RPNExpr(test, 1)
                    res = expr.eval(random.randint(0, IMAX))
                    self.assertEqual(res, 0)

    def test_stack_init(self):
        """ testing that stack is initialized to 0 """
        rpn = ' '.join(['+' for _ in range(15)])
        for stack_size in range(4, 128):
            with self.subTest('Stack with size %d initialized to 0' % stack_size):
                for argc in range(0,256,16):
                    expr = pyrpn.RPNExpr(rpn, argc, stack_size)
                    r = expr.eval(*[random.randint(0, IMAX)
                                    for _ in range(argc)])
                    self.assertEqual(r, 0,
                        '"+ + + +..." should be 0 but %d returned with %d args' % (r, argc))


    def test_lshift_limit(self):
        """ 2 << 0x10000 == 0 ? """
        expr = pyrpn.RPNExpr("2 %d <<" % 0x100000, 0)
        res = expr.eval()
        self.assertEqual(res, 0)

    def test_rshift_limit(self):
        """ (1<<64)-1 >> 0x10000 == 0 ? """
        expr = pyrpn.RPNExpr("%d %d >>" % ((1<<64)-1, 0x100000), 0)
        res = expr.eval()
        self.assertEqual(res, 0)


    def test_airthm_extended(self):
        """ Extended arithmetic tests """
        exprs = (
            ('A0 A1 +', '{0} + {1}', 2),
            ('A0 A0 A1 + +', '{0} + {1} + {0}', 2),
            ('A1 A0 A0 A0 A0 A0 A0 A0 A0 + + + + + + +', '{0} * 8', 2),
            ('+', '0', 2),
            ('-', '0', 2),
            ('A0 A1 -', '{0} - {1}', 2),
            ('A0 A0 A1 - -', '{0} - ({0} - {1})', 2),
            ('A0 0 A0 - -', '({0} - (0 - {0})) ', 2),
            ('*', '0', 2),
            ('A0 A1 *', '{0} * {1}', 2),
            ('A0 A0 A1 * *', '{0} * {0} * {1}', 2),
            ('A0 A0 A0 * *', '{0} * {0} * {0}', 2),
            ('A0 A1 x /', '{1} // {0}', 2),
            ('A0 A1 A0 pop /', '{0} // {1}', 2),
            ('A0 A1 dup +', '{1} + {1}', 2),
        )
        for rpn, pye, argc in exprs:
            expr = pyrpn.RPNExpr(rpn, argc, 8)
            for _ in range(0x300):
                args = tuple([random.randint(0,255) for _ in range(argc)])
                with self.subTest('%s == %s %r' % (rpn, pye, args)):
                    pyexpr = pye.format(*args)
                    try:
                        respy = eval(pyexpr) % (1<<64)
                    except ZeroDivisionError:
                        respy = 0
                    res = expr.eval(*args)
                    self.assertEqual(res, respy,
                        '%s%r != %s' % (rpn, args, pyexpr))


class SequentialTestLoader(unittest.TestLoader):
    def getTestCaseNames(self, testCaseClass):
        test_names = super().getTestCaseNames(testCaseClass)
        testcase_methods = list(testCaseClass.__dict__.keys())
        test_names.sort(key=testcase_methods.index)
        return test_names


if __name__ == '__main__':
    unittest.main(testLoader=SequentialTestLoader())