test_eval.py

# Copyright (c) 2011, Jay Conrod.
# All rights reserved.

# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of Jay Conrod nor the
#       names of its contributors may be used to endorse or promote products
#       derived from this software without specific prior written permission.

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL JAY CONROD BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import unittest
from imp_lexer import *
from imp_parser import *

class TestEvaluation(unittest.TestCase):
    def program_test(self, code, expected_env):
        tokens = imp_lex(code)
        result = imp_parse(tokens)
        self.assertNotEquals(None, result)
        program = result.value
        env = {}
        program.eval(env)
        self.assertEquals(expected_env, env)

    def test_assign(self):
        self.program_test('x := 1', {'x': 1})

    def test_compound(self):
        self.program_test('x := 1; y := 2', {'x': 1, 'y': 2})

    def test_if(self):
        self.program_test('if 1 < 2 then x := 1 else x := 2 end', {'x': 1})

    # def test_while(self):
    #     self.program_test('x := 10; y := 0; while x > 0 do y := y + 1 end', {'x': 0, 'y': 10})