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b4be87a04a
DeprecationWarning will continue to be emitted for invalid escape
sequences in string and bytes literals just as it did in 3.7.
SyntaxWarning may be emitted in the future. But per mailing list
discussion, we don't yet know when because we haven't settled on how to
do so in a non-disruptive manner.
(Applies 4c5b6bac24 to the master branch).
(This is https://github.com/python/cpython/pull/15142 for master/3.9)
https://bugs.python.org/issue32912
Automerge-Triggered-By: @gpshead
252 lines
9.9 KiB
Python
252 lines
9.9 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' | rb'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 doesn'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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import warnings
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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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h = '\U0001d120'
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assert ord(h) == 0x1d120
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i = r'\U0001d120'
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assert list(map(ord, i)) == [92, 85, 48, 48, 48, 49, 100, 49, 50, 48]
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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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from test.support import check_syntax_warning
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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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self.assertEqual(eval(r""" '\U0001d120' """), chr(0x1d120))
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self.assertEqual(eval(""" '\U0001d120' """), chr(0x1d120))
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def test_eval_str_incomplete(self):
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self.assertRaises(SyntaxError, eval, r""" '\x' """)
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self.assertRaises(SyntaxError, eval, r""" '\x0' """)
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self.assertRaises(SyntaxError, eval, r""" '\u' """)
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self.assertRaises(SyntaxError, eval, r""" '\u0' """)
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self.assertRaises(SyntaxError, eval, r""" '\u00' """)
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self.assertRaises(SyntaxError, eval, r""" '\u000' """)
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self.assertRaises(SyntaxError, eval, r""" '\U' """)
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self.assertRaises(SyntaxError, eval, r""" '\U0' """)
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self.assertRaises(SyntaxError, eval, r""" '\U00' """)
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self.assertRaises(SyntaxError, eval, r""" '\U000' """)
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self.assertRaises(SyntaxError, eval, r""" '\U0000' """)
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self.assertRaises(SyntaxError, eval, r""" '\U00000' """)
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self.assertRaises(SyntaxError, eval, r""" '\U000000' """)
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self.assertRaises(SyntaxError, eval, r""" '\U0000000' """)
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def test_eval_str_invalid_escape(self):
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for b in range(1, 128):
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if b in b"""\n\r"'01234567NU\\abfnrtuvx""":
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continue
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with self.assertWarns(DeprecationWarning):
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self.assertEqual(eval(r"'\%c'" % b), '\\' + chr(b))
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with warnings.catch_warnings(record=True) as w:
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warnings.simplefilter('always', category=DeprecationWarning)
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eval("'''\n\\z'''")
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self.assertEqual(len(w), 1)
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self.assertEqual(w[0].filename, '<string>')
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self.assertEqual(w[0].lineno, 1)
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with warnings.catch_warnings(record=True) as w:
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warnings.simplefilter('error', category=DeprecationWarning)
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with self.assertRaises(SyntaxError) as cm:
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eval("'''\n\\z'''")
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exc = cm.exception
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self.assertEqual(w, [])
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self.assertEqual(exc.filename, '<string>')
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self.assertEqual(exc.lineno, 1)
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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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self.assertEqual(eval(r""" r'\U0001d120' """), '\\' + 'U0001d120')
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self.assertEqual(eval(""" r'\U0001d120' """), chr(0x1d120))
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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""" br'\u1881' """), b'\\' + b'u1881')
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self.assertRaises(SyntaxError, eval, """ b'\u1881' """)
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self.assertEqual(eval(r""" br'\U0001d120' """), b'\\' + b'U0001d120')
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self.assertRaises(SyntaxError, eval, """ b'\U0001d120' """)
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def test_eval_bytes_incomplete(self):
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self.assertRaises(SyntaxError, eval, r""" b'\x' """)
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self.assertRaises(SyntaxError, eval, r""" b'\x0' """)
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def test_eval_bytes_invalid_escape(self):
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for b in range(1, 128):
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if b in b"""\n\r"'01234567\\abfnrtvx""":
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continue
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with self.assertWarns(DeprecationWarning):
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self.assertEqual(eval(r"b'\%c'" % b), b'\\' + bytes([b]))
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with warnings.catch_warnings(record=True) as w:
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warnings.simplefilter('always', category=DeprecationWarning)
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eval("b'''\n\\z'''")
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self.assertEqual(len(w), 1)
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self.assertEqual(w[0].filename, '<string>')
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self.assertEqual(w[0].lineno, 1)
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with warnings.catch_warnings(record=True) as w:
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warnings.simplefilter('error', category=DeprecationWarning)
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with self.assertRaises(SyntaxError) as cm:
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eval("b'''\n\\z'''")
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exc = cm.exception
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self.assertEqual(w, [])
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self.assertEqual(exc.filename, '<string>')
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self.assertEqual(exc.lineno, 1)
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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(""" rb'x' """), b'x')
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self.assertEqual(eval(r""" br'\x01' """), b'\\' + b'x01')
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self.assertEqual(eval(r""" rb'\x01' """), b'\\' + b'x01')
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self.assertEqual(eval(""" br'\x01' """), byte(1))
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self.assertEqual(eval(""" rb'\x01' """), byte(1))
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self.assertEqual(eval(r""" br'\x81' """), b"\\" + b"x81")
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self.assertEqual(eval(r""" rb'\x81' """), b"\\" + b"x81")
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self.assertRaises(SyntaxError, eval, """ br'\x81' """)
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self.assertRaises(SyntaxError, eval, """ rb'\x81' """)
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self.assertEqual(eval(r""" br'\u1881' """), b"\\" + b"u1881")
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self.assertEqual(eval(r""" rb'\u1881' """), b"\\" + b"u1881")
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self.assertRaises(SyntaxError, eval, """ br'\u1881' """)
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self.assertRaises(SyntaxError, eval, """ rb'\u1881' """)
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self.assertEqual(eval(r""" br'\U0001d120' """), b"\\" + b"U0001d120")
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self.assertEqual(eval(r""" rb'\U0001d120' """), b"\\" + b"U0001d120")
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self.assertRaises(SyntaxError, eval, """ br'\U0001d120' """)
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self.assertRaises(SyntaxError, eval, """ rb'\U0001d120' """)
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self.assertRaises(SyntaxError, eval, """ bb'' """)
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self.assertRaises(SyntaxError, eval, """ rr'' """)
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self.assertRaises(SyntaxError, eval, """ brr'' """)
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self.assertRaises(SyntaxError, eval, """ bbr'' """)
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self.assertRaises(SyntaxError, eval, """ rrb'' """)
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self.assertRaises(SyntaxError, eval, """ rbb'' """)
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def test_eval_str_u(self):
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self.assertEqual(eval(""" u'x' """), 'x')
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self.assertEqual(eval(""" U'\u00e4' """), 'ä')
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self.assertEqual(eval(""" u'\N{LATIN SMALL LETTER A WITH DIAERESIS}' """), 'ä')
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self.assertRaises(SyntaxError, eval, """ ur'' """)
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self.assertRaises(SyntaxError, eval, """ ru'' """)
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self.assertRaises(SyntaxError, eval, """ bu'' """)
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self.assertRaises(SyntaxError, eval, """ ub'' """)
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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("utf-8")
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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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unittest.main()
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