class ParserTestCase(unittest.TestCase):
"""This test check to make sure the internal representation matches the file read"""
def setUp(self):
f = open("../grammars/" + self.file)
G = f.read()
f.close()
self.grammar_one = Parser(G)
expected_s = StringIO()
self.grammar_one.printer(expected_s)
expected_s.seek(0, 0)
self.grammar_two = Parser(expected_s.read())
def test_start_token(self):
"""%start nonterminal"""
self.assertEquals(self.grammar_one.grammar.start_token, self.grammar_two.grammar.start_token)
def test_terminals(self):
"""%token terminals"""
self.assertEquals(len(self.grammar_one.grammar.terminal_name), len(self.grammar_two.grammar.terminal_name))
for (a, b) in zip(self.grammar_one.grammar.terminal_name, self.grammar_two.grammar.terminal_name):
self.assertEquals(a, b)
def test_productions(self):
"""Parser Production Count"""
self.assertEquals(len(self.grammar_one.grammar.production_list), len(self.grammar_two.grammar.production_list))
for (a, b) in zip(self.grammar_one.grammar.production_list, self.grammar_two.grammar.production_list):
self.assertEquals(a.ls, b.ls)
def main(argv):
# open file
try:
filename = argv[0]
except IndexError:
print "Usage: %s grammar.yacc" % sys.argv[0]
sys.exit(2)
try:
f = open(filename, "r")
except IOError:
print "Unable to open file", filename
sys.exit(2)
G = f.read()
f.close()
parse = Parser(G)
t = Transform(parse)
t.pa()
parse.printer()
