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import unittest
from test import support
import os
import sys
import subprocess
SYMBOL_FILE = support.findfile('symbol.py')
GRAMMAR_FILE = os.path.join(os.path.dirname(__file__),
'..', '..', 'Include', 'graminit.h')
TEST_PY_FILE = 'symbol_test.py'
class TestSymbolGeneration(unittest.TestCase):
def _copy_file_without_generated_symbols(self, source_file, dest_file):
with open(source_file) as fp:
lines = fp.readlines()
with open(dest_file, 'w') as fp:
fp.writelines(lines[:lines.index("#--start constants--\n") + 1])
fp.writelines(lines[lines.index("#--end constants--\n"):])
def _generate_symbols(self, grammar_file, target_symbol_py_file):
proc = subprocess.Popen([sys.executable,
SYMBOL_FILE,
grammar_file,
target_symbol_py_file], stderr=subprocess.PIPE)
stderr = proc.communicate()[1]
return proc.returncode, stderr
def compare_files(self, file1, file2):
with open(file1) as fp:
lines1 = fp.readlines()
with open(file2) as fp:
lines2 = fp.readlines()
self.assertEqual(lines1, lines2)
@unittest.skipIf(not os.path.exists(GRAMMAR_FILE),
'test only works from source build directory')
def test_real_grammar_and_symbol_file(self):
output = support.TESTFN
self.addCleanup(support.unlink, output)
self._copy_file_without_generated_symbols(SYMBOL_FILE, output)
exitcode, stderr = self._generate_symbols(GRAMMAR_FILE, output)
self.assertEqual(b'', stderr)
self.assertEqual(0, exitcode)
self.compare_files(SYMBOL_FILE, output)
if __name__ == "__main__":
unittest.main()
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