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29fd7120e4
raw string literals. I added a whole bunch of tests but am still not sure I am testing all paths through the code. I really think the code could be simplified quite a bit.
149 lines
4.9 KiB
Python
149 lines
4.9 KiB
Python
r"""Test correct treatment of various string literals by the parser.
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There are four types of string literals:
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'abc' -- normal str
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r'abc' -- raw str
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b'xyz' -- normal bytes
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br'xyz' -- raw bytes
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The difference between normal and raw strings is of course that in a
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raw string, \ escapes (while still used to determine the end of the
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literal) are not interpreted, so that r'\x00' contains four
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characters: a backslash, an x, and two zeros; while '\x00' contains a
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single character (code point zero).
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The tricky thing is what should happen when non-ASCII bytes are used
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inside literals. For bytes literals, this is considered illegal. But
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for str literals, those bytes are supposed to be decoded using the
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encoding declared for the file (UTF-8 by default).
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We have to test this with various file encodings. We also test it with
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exec()/eval(), which uses a different code path.
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This file is really about correct treatment of encodings and
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backslashes. It doens't concern itself with issues like single
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vs. double quotes or singly- vs. triply-quoted strings: that's dealt
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with elsewhere (I assume).
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"""
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import os
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import sys
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import shutil
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import tempfile
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import unittest
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TEMPLATE = r"""# coding: %s
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a = 'x'
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assert ord(a) == 120
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b = '\x01'
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assert ord(b) == 1
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c = r'\x01'
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assert list(map(ord, c)) == [92, 120, 48, 49]
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d = '\x81'
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assert ord(d) == 0x81
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e = r'\x81'
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assert list(map(ord, e)) == [92, 120, 56, 49]
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f = '\u1881'
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assert ord(f) == 0x1881
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g = r'\u1881'
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assert list(map(ord, g)) == [92, 117, 49, 56, 56, 49]
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"""
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def byte(i):
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return bytes([i])
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class TestLiterals(unittest.TestCase):
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def setUp(self):
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self.save_path = sys.path[:]
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self.tmpdir = tempfile.mkdtemp()
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sys.path.insert(0, self.tmpdir)
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def tearDown(self):
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sys.path = self.save_path
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shutil.rmtree(self.tmpdir, ignore_errors=True)
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def test_template(self):
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# Check that the template doesn't contain any non-printables
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# except for \n.
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for c in TEMPLATE:
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assert c == '\n' or ' ' <= c <= '~', repr(c)
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def test_eval_str_normal(self):
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self.assertEqual(eval(""" 'x' """), 'x')
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self.assertEqual(eval(r""" '\x01' """), chr(1))
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self.assertEqual(eval(""" '\x01' """), chr(1))
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self.assertEqual(eval(r""" '\x81' """), chr(0x81))
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self.assertEqual(eval(""" '\x81' """), chr(0x81))
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self.assertEqual(eval(r""" '\u1881' """), chr(0x1881))
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self.assertEqual(eval(""" '\u1881' """), chr(0x1881))
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def test_eval_str_raw(self):
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self.assertEqual(eval(""" r'x' """), 'x')
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self.assertEqual(eval(r""" r'\x01' """), '\\' + 'x01')
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self.assertEqual(eval(""" r'\x01' """), chr(1))
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self.assertEqual(eval(r""" r'\x81' """), '\\' + 'x81')
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self.assertEqual(eval(""" r'\x81' """), chr(0x81))
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self.assertEqual(eval(r""" r'\u1881' """), '\\' + 'u1881')
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self.assertEqual(eval(""" r'\u1881' """), chr(0x1881))
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def test_eval_bytes_normal(self):
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self.assertEqual(eval(""" b'x' """), b'x')
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self.assertEqual(eval(r""" b'\x01' """), byte(1))
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self.assertEqual(eval(""" b'\x01' """), byte(1))
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self.assertEqual(eval(r""" b'\x81' """), byte(0x81))
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self.assertRaises(SyntaxError, eval, """ b'\x81' """)
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self.assertEqual(eval(r""" b'\u1881' """), b'\\' + b'u1881')
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self.assertRaises(SyntaxError, eval, """ b'\u1881' """)
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def test_eval_bytes_raw(self):
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self.assertEqual(eval(""" br'x' """), b'x')
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self.assertEqual(eval(r""" br'\x01' """), b'\\' + b'x01')
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self.assertEqual(eval(""" br'\x01' """), byte(1))
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self.assertEqual(eval(r""" br'\x81' """), b"\\" + b"x81")
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self.assertRaises(SyntaxError, eval, """ br'\x81' """)
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self.assertEqual(eval(r""" br'\u1881' """), b"\\" + b"u1881")
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self.assertRaises(SyntaxError, eval, """ br'\u1881' """)
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def check_encoding(self, encoding, extra=""):
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modname = "xx_" + encoding.replace("-", "_")
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fn = os.path.join(self.tmpdir, modname + ".py")
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f = open(fn, "w", encoding=encoding)
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try:
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f.write(TEMPLATE % encoding)
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f.write(extra)
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finally:
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f.close()
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__import__(modname)
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del sys.modules[modname]
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def test_file_utf_8(self):
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extra = "z = '\u1234'; assert ord(z) == 0x1234\n"
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self.check_encoding("utf-8", extra)
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def test_file_utf_8_error(self):
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extra = "b'\x80'\n"
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self.assertRaises(SyntaxError, self.check_encoding, "utf-8", extra)
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def test_file_utf8(self):
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self.check_encoding("utf8")
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def test_file_iso_8859_1(self):
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self.check_encoding("iso-8859-1")
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def test_file_latin_1(self):
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self.check_encoding("latin-1")
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def test_file_latin9(self):
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self.check_encoding("latin9")
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if __name__ == "__main__":
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# Hack so that error messages containing non-ASCII can be printed
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sys.stdout._encoding = sys.stderr._encoding = "utf-8"
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unittest.main()
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