import unittest
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from test import support
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import os
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import sys
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import sysconfig
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import subprocess
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SYMBOL_FILE = support.findfile('symbol.py')
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GRAMMAR_FILE = os.path.join(os.path.dirname(__file__),
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'..', '..', 'Include', 'graminit.h')
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TEST_PY_FILE = 'symbol_test.py'
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class TestSymbolGeneration(unittest.TestCase):
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def _copy_file_without_generated_symbols(self, source_file, dest_file):
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with open(source_file) as fp:
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lines = fp.readlines()
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with open(dest_file, 'w') as fp:
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fp.writelines(lines[:lines.index("#--start constants--\n") + 1])
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fp.writelines(lines[lines.index("#--end constants--\n"):])
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def _generate_symbols(self, grammar_file, target_symbol_py_file):
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proc = subprocess.Popen([sys.executable,
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SYMBOL_FILE,
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grammar_file,
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target_symbol_py_file], stderr=subprocess.PIPE)
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stderr = proc.communicate()[1]
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return proc.returncode, stderr
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def compare_files(self, file1, file2):
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with open(file1) as fp:
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lines1 = fp.readlines()
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with open(file2) as fp:
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lines2 = fp.readlines()
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self.assertEqual(lines1, lines2)
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@unittest.skipUnless(sysconfig.is_python_build(),
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'test only works from source build directory')
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def test_real_grammar_and_symbol_file(self):
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output = support.TESTFN
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self.addCleanup(support.unlink, output)
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self._copy_file_without_generated_symbols(SYMBOL_FILE, output)
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exitcode, stderr = self._generate_symbols(GRAMMAR_FILE, output)
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self.assertEqual(b'', stderr)
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self.assertEqual(0, exitcode)
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self.compare_files(SYMBOL_FILE, output)
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if __name__ == "__main__":
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unittest.main()
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