forked from python/cpython
-
Notifications
You must be signed in to change notification settings - Fork 1
/
test_string_literals.py
322 lines (275 loc) · 13.1 KB
/
test_string_literals.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
r"""Test correct treatment of various string literals by the parser.
There are four types of string literals:
'abc' -- normal str
r'abc' -- raw str
b'xyz' -- normal bytes
br'xyz' | rb'xyz' -- raw bytes
The difference between normal and raw strings is of course that in a
raw string, \ escapes (while still used to determine the end of the
literal) are not interpreted, so that r'\x00' contains four
characters: a backslash, an x, and two zeros; while '\x00' contains a
single character (code point zero).
The tricky thing is what should happen when non-ASCII bytes are used
inside literals. For bytes literals, this is considered illegal. But
for str literals, those bytes are supposed to be decoded using the
encoding declared for the file (UTF-8 by default).
We have to test this with various file encodings. We also test it with
exec()/eval(), which uses a different code path.
This file is really about correct treatment of encodings and
backslashes. It doesn't concern itself with issues like single
vs. double quotes or singly- vs. triply-quoted strings: that's dealt
with elsewhere (I assume).
"""
import os
import sys
import shutil
import tempfile
import unittest
import warnings
TEMPLATE = r"""# coding: %s
a = 'x'
assert ord(a) == 120
b = '\x01'
assert ord(b) == 1
c = r'\x01'
assert list(map(ord, c)) == [92, 120, 48, 49]
d = '\x81'
assert ord(d) == 0x81
e = r'\x81'
assert list(map(ord, e)) == [92, 120, 56, 49]
f = '\u1881'
assert ord(f) == 0x1881
g = r'\u1881'
assert list(map(ord, g)) == [92, 117, 49, 56, 56, 49]
h = '\U0001d120'
assert ord(h) == 0x1d120
i = r'\U0001d120'
assert list(map(ord, i)) == [92, 85, 48, 48, 48, 49, 100, 49, 50, 48]
"""
def byte(i):
return bytes([i])
class TestLiterals(unittest.TestCase):
def setUp(self):
self.save_path = sys.path[:]
self.tmpdir = tempfile.mkdtemp()
sys.path.insert(0, self.tmpdir)
def tearDown(self):
sys.path[:] = self.save_path
shutil.rmtree(self.tmpdir, ignore_errors=True)
def test_template(self):
# Check that the template doesn't contain any non-printables
# except for \n.
for c in TEMPLATE:
assert c == '\n' or ' ' <= c <= '~', repr(c)
def test_eval_str_normal(self):
self.assertEqual(eval(""" 'x' """), 'x')
self.assertEqual(eval(r""" '\x01' """), chr(1))
self.assertEqual(eval(""" '\x01' """), chr(1))
self.assertEqual(eval(r""" '\x81' """), chr(0x81))
self.assertEqual(eval(""" '\x81' """), chr(0x81))
self.assertEqual(eval(r""" '\u1881' """), chr(0x1881))
self.assertEqual(eval(""" '\u1881' """), chr(0x1881))
self.assertEqual(eval(r""" '\U0001d120' """), chr(0x1d120))
self.assertEqual(eval(""" '\U0001d120' """), chr(0x1d120))
def test_eval_str_incomplete(self):
self.assertRaises(SyntaxError, eval, r""" '\x' """)
self.assertRaises(SyntaxError, eval, r""" '\x0' """)
self.assertRaises(SyntaxError, eval, r""" '\u' """)
self.assertRaises(SyntaxError, eval, r""" '\u0' """)
self.assertRaises(SyntaxError, eval, r""" '\u00' """)
self.assertRaises(SyntaxError, eval, r""" '\u000' """)
self.assertRaises(SyntaxError, eval, r""" '\U' """)
self.assertRaises(SyntaxError, eval, r""" '\U0' """)
self.assertRaises(SyntaxError, eval, r""" '\U00' """)
self.assertRaises(SyntaxError, eval, r""" '\U000' """)
self.assertRaises(SyntaxError, eval, r""" '\U0000' """)
self.assertRaises(SyntaxError, eval, r""" '\U00000' """)
self.assertRaises(SyntaxError, eval, r""" '\U000000' """)
self.assertRaises(SyntaxError, eval, r""" '\U0000000' """)
def test_eval_str_invalid_escape(self):
for b in range(1, 128):
if b in b"""\n\r"'01234567NU\\abfnrtuvx""":
continue
with self.assertWarns(SyntaxWarning):
self.assertEqual(eval(r"'\%c'" % b), '\\' + chr(b))
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always', category=SyntaxWarning)
eval("'''\n\\z'''")
self.assertEqual(len(w), 1)
self.assertEqual(str(w[0].message), r"invalid escape sequence '\z'")
self.assertEqual(w[0].filename, '<string>')
self.assertEqual(w[0].lineno, 1)
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('error', category=SyntaxWarning)
with self.assertRaises(SyntaxError) as cm:
eval("'''\n\\z'''")
exc = cm.exception
self.assertEqual(w, [])
self.assertEqual(exc.msg, r"invalid escape sequence '\z'")
self.assertEqual(exc.filename, '<string>')
self.assertEqual(exc.lineno, 1)
self.assertEqual(exc.offset, 1)
# Check that the warning is raised ony once if there are syntax errors
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always', category=SyntaxWarning)
with self.assertRaises(SyntaxError) as cm:
eval("'\\e' $")
exc = cm.exception
self.assertEqual(len(w), 1)
self.assertEqual(w[0].category, SyntaxWarning)
self.assertRegex(str(w[0].message), 'invalid escape sequence')
self.assertEqual(w[0].filename, '<string>')
def test_eval_str_invalid_octal_escape(self):
for i in range(0o400, 0o1000):
with self.assertWarns(SyntaxWarning):
self.assertEqual(eval(r"'\%o'" % i), chr(i))
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always', category=SyntaxWarning)
eval("'''\n\\407'''")
self.assertEqual(len(w), 1)
self.assertEqual(str(w[0].message),
r"invalid octal escape sequence '\407'")
self.assertEqual(w[0].filename, '<string>')
self.assertEqual(w[0].lineno, 1)
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('error', category=SyntaxWarning)
with self.assertRaises(SyntaxError) as cm:
eval("'''\n\\407'''")
exc = cm.exception
self.assertEqual(w, [])
self.assertEqual(exc.msg, r"invalid octal escape sequence '\407'")
self.assertEqual(exc.filename, '<string>')
self.assertEqual(exc.lineno, 1)
self.assertEqual(exc.offset, 1)
def test_eval_str_raw(self):
self.assertEqual(eval(""" r'x' """), 'x')
self.assertEqual(eval(r""" r'\x01' """), '\\' + 'x01')
self.assertEqual(eval(""" r'\x01' """), chr(1))
self.assertEqual(eval(r""" r'\x81' """), '\\' + 'x81')
self.assertEqual(eval(""" r'\x81' """), chr(0x81))
self.assertEqual(eval(r""" r'\u1881' """), '\\' + 'u1881')
self.assertEqual(eval(""" r'\u1881' """), chr(0x1881))
self.assertEqual(eval(r""" r'\U0001d120' """), '\\' + 'U0001d120')
self.assertEqual(eval(""" r'\U0001d120' """), chr(0x1d120))
def test_eval_bytes_normal(self):
self.assertEqual(eval(""" b'x' """), b'x')
self.assertEqual(eval(r""" b'\x01' """), byte(1))
self.assertEqual(eval(""" b'\x01' """), byte(1))
self.assertEqual(eval(r""" b'\x81' """), byte(0x81))
self.assertRaises(SyntaxError, eval, """ b'\x81' """)
self.assertEqual(eval(r""" br'\u1881' """), b'\\' + b'u1881')
self.assertRaises(SyntaxError, eval, """ b'\u1881' """)
self.assertEqual(eval(r""" br'\U0001d120' """), b'\\' + b'U0001d120')
self.assertRaises(SyntaxError, eval, """ b'\U0001d120' """)
def test_eval_bytes_incomplete(self):
self.assertRaises(SyntaxError, eval, r""" b'\x' """)
self.assertRaises(SyntaxError, eval, r""" b'\x0' """)
def test_eval_bytes_invalid_escape(self):
for b in range(1, 128):
if b in b"""\n\r"'01234567\\abfnrtvx""":
continue
with self.assertWarns(SyntaxWarning):
self.assertEqual(eval(r"b'\%c'" % b), b'\\' + bytes([b]))
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always', category=SyntaxWarning)
eval("b'''\n\\z'''")
self.assertEqual(len(w), 1)
self.assertEqual(str(w[0].message), r"invalid escape sequence '\z'")
self.assertEqual(w[0].filename, '<string>')
self.assertEqual(w[0].lineno, 1)
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('error', category=SyntaxWarning)
with self.assertRaises(SyntaxError) as cm:
eval("b'''\n\\z'''")
exc = cm.exception
self.assertEqual(w, [])
self.assertEqual(exc.msg, r"invalid escape sequence '\z'")
self.assertEqual(exc.filename, '<string>')
self.assertEqual(exc.lineno, 1)
def test_eval_bytes_invalid_octal_escape(self):
for i in range(0o400, 0o1000):
with self.assertWarns(SyntaxWarning):
self.assertEqual(eval(r"b'\%o'" % i), bytes([i & 0o377]))
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always', category=SyntaxWarning)
eval("b'''\n\\407'''")
self.assertEqual(len(w), 1)
self.assertEqual(str(w[0].message),
r"invalid octal escape sequence '\407'")
self.assertEqual(w[0].filename, '<string>')
self.assertEqual(w[0].lineno, 1)
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('error', category=SyntaxWarning)
with self.assertRaises(SyntaxError) as cm:
eval("b'''\n\\407'''")
exc = cm.exception
self.assertEqual(w, [])
self.assertEqual(exc.msg, r"invalid octal escape sequence '\407'")
self.assertEqual(exc.filename, '<string>')
self.assertEqual(exc.lineno, 1)
def test_eval_bytes_raw(self):
self.assertEqual(eval(""" br'x' """), b'x')
self.assertEqual(eval(""" rb'x' """), b'x')
self.assertEqual(eval(r""" br'\x01' """), b'\\' + b'x01')
self.assertEqual(eval(r""" rb'\x01' """), b'\\' + b'x01')
self.assertEqual(eval(""" br'\x01' """), byte(1))
self.assertEqual(eval(""" rb'\x01' """), byte(1))
self.assertEqual(eval(r""" br'\x81' """), b"\\" + b"x81")
self.assertEqual(eval(r""" rb'\x81' """), b"\\" + b"x81")
self.assertRaises(SyntaxError, eval, """ br'\x81' """)
self.assertRaises(SyntaxError, eval, """ rb'\x81' """)
self.assertEqual(eval(r""" br'\u1881' """), b"\\" + b"u1881")
self.assertEqual(eval(r""" rb'\u1881' """), b"\\" + b"u1881")
self.assertRaises(SyntaxError, eval, """ br'\u1881' """)
self.assertRaises(SyntaxError, eval, """ rb'\u1881' """)
self.assertEqual(eval(r""" br'\U0001d120' """), b"\\" + b"U0001d120")
self.assertEqual(eval(r""" rb'\U0001d120' """), b"\\" + b"U0001d120")
self.assertRaises(SyntaxError, eval, """ br'\U0001d120' """)
self.assertRaises(SyntaxError, eval, """ rb'\U0001d120' """)
self.assertRaises(SyntaxError, eval, """ bb'' """)
self.assertRaises(SyntaxError, eval, """ rr'' """)
self.assertRaises(SyntaxError, eval, """ brr'' """)
self.assertRaises(SyntaxError, eval, """ bbr'' """)
self.assertRaises(SyntaxError, eval, """ rrb'' """)
self.assertRaises(SyntaxError, eval, """ rbb'' """)
def test_eval_str_u(self):
self.assertEqual(eval(""" u'x' """), 'x')
self.assertEqual(eval(""" U'\u00e4' """), 'ä')
self.assertEqual(eval(""" u'\N{LATIN SMALL LETTER A WITH DIAERESIS}' """), 'ä')
self.assertRaises(SyntaxError, eval, """ ur'' """)
self.assertRaises(SyntaxError, eval, """ ru'' """)
self.assertRaises(SyntaxError, eval, """ bu'' """)
self.assertRaises(SyntaxError, eval, """ ub'' """)
def test_uppercase_prefixes(self):
self.assertEqual(eval(""" B'x' """), b'x')
self.assertEqual(eval(r""" R'\x01' """), r'\x01')
self.assertEqual(eval(r""" BR'\x01' """), br'\x01')
self.assertEqual(eval(""" F'{1+1}' """), f'{1+1}')
self.assertEqual(eval(r""" U'\U0001d120' """), u'\U0001d120')
def check_encoding(self, encoding, extra=""):
modname = "xx_" + encoding.replace("-", "_")
fn = os.path.join(self.tmpdir, modname + ".py")
f = open(fn, "w", encoding=encoding)
try:
f.write(TEMPLATE % encoding)
f.write(extra)
finally:
f.close()
__import__(modname)
del sys.modules[modname]
def test_file_utf_8(self):
extra = "z = '\u1234'; assert ord(z) == 0x1234\n"
self.check_encoding("utf-8", extra)
def test_file_utf_8_error(self):
extra = "b'\x80'\n"
self.assertRaises(SyntaxError, self.check_encoding, "utf-8", extra)
def test_file_utf8(self):
self.check_encoding("utf-8")
def test_file_iso_8859_1(self):
self.check_encoding("iso-8859-1")
def test_file_latin_1(self):
self.check_encoding("latin-1")
def test_file_latin9(self):
self.check_encoding("latin9")
if __name__ == "__main__":
unittest.main()