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Commit 634c41aa authored by Stefan Behnel's avatar Stefan Behnel
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update fstring tests from CPython 3.6

parent 65f63427
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Showing with 125 additions and 99 deletions
tests/run/test_fstring.pyx
View file @ 634c41aa
......@@ -14,7 +14,7 @@ IS_PY26 = sys.version_info[:2] < (2, 7)
from Cython.Build.Inline import cython_inline
from Cython.TestUtils import CythonTest
from Cython.Compiler.Errors import CompileError, hold_errors, release_errors, error_stack
from Cython.Compiler.Errors import CompileError, hold_errors, release_errors, error_stack, held_errors
def cy_eval(s, **kwargs):
return cython_inline('return ' + s, force=True, **kwargs)
......@@ -31,15 +31,16 @@ a_global = 'global variable'
class TestCase(CythonTest):
def assertAllRaise(self, exception_type, regex, error_strings):
for str in error_strings:
hold_errors()
if exception_type is SyntaxError:
try:
self.fragment(str)
assert held_errors(), "Invalid Cython code failed to raise SyntaxError: %s" % str
except CompileError:
assert True
else:
assert False, "Invalid Cython code failed to raise SyntaxError: %s" % str
finally:
release_errors(ignore=True)
else:
hold_errors()
try:
cython_inline(str, quiet=True)
except exception_type:
......@@ -130,6 +131,15 @@ f'{a * x()}'"""
# Make sure x was called.
self.assertTrue(x.called)
def test_docstring(self):
def f():
f'''Not a docstring'''
self.assertIsNone(f.__doc__)
def g():
'''Not a docstring''' \
f''
self.assertIsNone(g.__doc__)
def __test_literal_eval(self):
# With no expressions, an f-string is okay.
self.assertEqual(ast.literal_eval("f'x'"), 'x')
......@@ -137,7 +147,7 @@ f'{a * x()}'"""
# But this should raise an error.
with self.assertRaisesRegex(ValueError, 'malformed node or string'):
ast.literal_eval("f'x{3}'")
ast.literal_eval("f'x'")
# As should this, which uses a different ast node
with self.assertRaisesRegex(ValueError, 'malformed node or string'):
......@@ -152,34 +162,17 @@ f'{a * x()}'"""
exec(c)
self.assertEqual(x[0], 'foo3')
def test_compile_time_concat_errors(self):
self.assertAllRaise(SyntaxError,
'cannot mix bytes and nonbytes literals',
[r"""f'' b''""",
r"""b'' f''""",
])
def test_literal(self):
self.assertEqual(f'', '')
self.assertEqual(f'a', 'a')
self.assertEqual(f' ', ' ')
self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}',
'\N{GREEK CAPITAL LETTER DELTA}')
self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}',
'\u0394')
self.assertEqual(f'\N{True}', '\u22a8')
self.assertEqual(rf'\N{True}', r'\NTrue')
def test_escape_order(self):
# note that hex(ord('{')) == 0x7b, so this
# string becomes f'a{4*10}b'
self.assertEqual(f'a\u007b4*10}b', 'a40b')
self.assertEqual(f'a\x7b4*10}b', 'a40b')
self.assertEqual(f'a\x7b4*10\N{RIGHT CURLY BRACKET}b', 'a40b')
self.assertEqual(f'{"a"!\N{LATIN SMALL LETTER R}}', "'a'")
self.assertEqual(f'{10\x3a02X}', '0A')
self.assertEqual(f'{10:02\N{LATIN CAPITAL LETTER X}}', '0A')
self.assertAllRaise(SyntaxError, "f-string: single '}' is not allowed",
[r"""f'a{\u007b4*10}b'""", # mis-matched brackets
])
self.assertAllRaise(SyntaxError, 'unexpected character after line continuation character',
[r"""f'{"a"\!r}'""",
r"""f'{a\!r}'""",
])
def test_unterminated_string(self):
self.assertAllRaise(SyntaxError, 'f-string: unterminated string',
......@@ -203,6 +196,14 @@ f'{a * x()}'"""
self.assertEqual(f'a}}', 'a}')
self.assertEqual(f'}}b', '}b')
self.assertEqual(f'a}}b', 'a}b')
self.assertEqual(f'{{}}', '{}')
self.assertEqual(f'a{{}}', 'a{}')
self.assertEqual(f'{{b}}', '{b}')
self.assertEqual(f'{{}}c', '{}c')
self.assertEqual(f'a{{b}}', 'a{b}')
self.assertEqual(f'a{{}}c', 'a{}c')
self.assertEqual(f'{{b}}c', '{b}c')
self.assertEqual(f'a{{b}}c', 'a{b}c')
self.assertEqual(f'{{{10}', '{10')
self.assertEqual(f'}}{10}', '}10')
......@@ -258,9 +259,12 @@ f'{a * x()}'"""
self.assertEqual(f'{"#"}', '#')
self.assertEqual(f'{d["#"]}', 'hash')
self.assertAllRaise(SyntaxError, "f-string cannot include '#'",
self.assertAllRaise(SyntaxError, "f-string expression part cannot include '#'",
["f'{1#}'", # error because the expression becomes "(1#)"
"f'{3(#)}'",
"f'{#}'",
"f'{)#}'", # When wrapped in parens, this becomes
# '()#)'. Make sure that doesn't compile.
])
def test_many_expressions(self):
......@@ -311,7 +315,7 @@ f'{a * x()}'"""
])
self.assertAllRaise(SyntaxError, "invalid syntax",
[# Invalid sytax inside a nested spec.
[# Invalid syntax inside a nested spec.
"f'{4:{/5}}'",
])
......@@ -349,8 +353,6 @@ f'{a * x()}'"""
"f'{ !r}'",
"f'{10:{ }}'",
"f' { } '",
r"f'{\n}'",
r"f'{\n \n}'",
# Catch the empty expression before the
# invalid conversion.
......@@ -392,24 +394,88 @@ f'{a * x()}'"""
["f'{\n}'",
])
def test_backslashes_in_string_part(self):
self.assertEqual(f'\t', '\t')
self.assertEqual(r'\t', '\\t')
self.assertEqual(rf'\t', '\\t')
self.assertEqual(f'{2}\t', '2\t')
self.assertEqual(f'{2}\t{3}', '2\t3')
self.assertEqual(f'\t{3}', '\t3')
self.assertEqual(f'\u0394', '\u0394')
self.assertEqual(r'\u0394', '\\u0394')
self.assertEqual(rf'\u0394', '\\u0394')
self.assertEqual(f'{2}\u0394', '2\u0394')
self.assertEqual(f'{2}\u0394{3}', '2\u03943')
self.assertEqual(f'\u0394{3}', '\u03943')
self.assertEqual(f'\U00000394', '\u0394')
self.assertEqual(r'\U00000394', '\\U00000394')
self.assertEqual(rf'\U00000394', '\\U00000394')
self.assertEqual(f'{2}\U00000394', '2\u0394')
self.assertEqual(f'{2}\U00000394{3}', '2\u03943')
self.assertEqual(f'\U00000394{3}', '\u03943')
self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}', '\u0394')
self.assertEqual(f'{2}\N{GREEK CAPITAL LETTER DELTA}', '2\u0394')
self.assertEqual(f'{2}\N{GREEK CAPITAL LETTER DELTA}{3}', '2\u03943')
self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}{3}', '\u03943')
self.assertEqual(f'2\N{GREEK CAPITAL LETTER DELTA}', '2\u0394')
self.assertEqual(f'2\N{GREEK CAPITAL LETTER DELTA}3', '2\u03943')
self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}3', '\u03943')
self.assertEqual(f'\x20', ' ')
self.assertEqual(r'\x20', '\\x20')
self.assertEqual(rf'\x20', '\\x20')
self.assertEqual(f'{2}\x20', '2 ')
self.assertEqual(f'{2}\x20{3}', '2 3')
self.assertEqual(f'\x20{3}', ' 3')
self.assertEqual(f'2\x20', '2 ')
self.assertEqual(f'2\x203', '2 3')
self.assertEqual(f'\x203', ' 3')
def test_misformed_unicode_character_name(self):
# These test are needed because unicode names are parsed
# differently inside f-strings.
self.assertAllRaise(SyntaxError, r"\(unicode error\) 'unicodeescape' codec can't decode bytes in position .*: malformed \\N character escape",
[r"f'\N'",
r"f'\N{'",
r"f'\N{GREEK CAPITAL LETTER DELTA'",
# Here are the non-f-string versions,
# which should give the same errors.
r"'\N'",
r"'\N{'",
r"'\N{GREEK CAPITAL LETTER DELTA'",
])
def test_no_backslashes_in_expression_part(self):
self.assertAllRaise(SyntaxError, 'f-string expression part cannot include a backslash',
[r"f'{\'a\'}'",
r"f'{\t3}'",
r"f'{\}'",
r"rf'{\'a\'}'",
r"rf'{\t3}'",
r"rf'{\}'",
r"""rf'{"\N{LEFT CURLY BRACKET}"}'""",
r"f'{\n}'",
])
def test_no_escapes_for_braces(self):
"""
Only literal curly braces begin an expression.
"""
# \x7b is '{'.
self.assertEqual(f'\x7b1+1}}', '{1+1}')
self.assertEqual(f'\x7b1+1', '{1+1')
self.assertEqual(f'\u007b1+1', '{1+1')
self.assertEqual(f'\N{LEFT CURLY BRACKET}1+1\N{RIGHT CURLY BRACKET}', '{1+1}')
def test_newlines_in_expressions(self):
self.assertEqual(f'{0}', '0')
self.assertEqual(f'{0\n}', '0')
self.assertEqual(f'{0\r}', '0')
self.assertEqual(f'{\n0\n}', '0')
self.assertEqual(f'{\r0\r}', '0')
self.assertEqual(f'{\n0\r}', '0')
self.assertEqual(f'{\n0}', '0')
self.assertEqual(f'{3+\n4}', '7')
self.assertEqual(f'{3+\\\n4}', '7')
self.assertEqual(rf'''{3+
4}''', '7')
self.assertEqual(f'''{3+\
4}''', '7')
self.assertAllRaise(SyntaxError, 'f-string: empty expression not allowed',
[r"f'{\n}'",
])
def test_lambda(self):
x = 5
......@@ -445,9 +511,6 @@ f'{a * x()}'"""
def test_expressions_with_triple_quoted_strings(self):
self.assertEqual(f"{'''x'''}", 'x')
self.assertEqual(f"{'''eric's'''}", "eric's")
self.assertEqual(f'{"""eric\'s"""}', "eric's")
self.assertEqual(f"{'''eric\"s'''}", 'eric"s')
self.assertEqual(f'{"""eric"s"""}', 'eric"s')
# Test concatenation within an expression
self.assertEqual(f'{"x" """eric"s""" "y"}', 'xeric"sy')
......@@ -549,10 +612,6 @@ f'{a * x()}'"""
y = 5
self.assertEqual(f'{f"{0}"*3}', '000')
self.assertEqual(f'{f"{y}"*3}', '555')
self.assertEqual(f'{f"{\'x\'}"*3}', 'xxx')
self.assertEqual(f"{r'x' f'{\"s\"}'}", 'xs')
self.assertEqual(f"{r'x'rf'{\"s\"}'}", 'xs')
def test_invalid_string_prefixes(self):
self.assertAllRaise(SyntaxError, 'unexpected EOF while parsing',
......@@ -570,29 +629,27 @@ f'{a * x()}'"""
"ruf''",
"FUR''",
"Fur''",
"fb''",
"fB''",
"Fb''",
"FB''",
"bf''",
"bF''",
"Bf''",
"BF''",
])
def test_leading_trailing_spaces(self):
self.assertEqual(f'{ 3}', '3')
self.assertEqual(f'{ 3}', '3')
self.assertEqual(f'{\t3}', '3')
self.assertEqual(f'{\t\t3}', '3')
self.assertEqual(f'{3 }', '3')
self.assertEqual(f'{3 }', '3')
self.assertEqual(f'{3\t}', '3')
self.assertEqual(f'{3\t\t}', '3')
self.assertEqual(f'expr={ {x: y for x, y in [(1, 2), ]}}',
'expr={1: 2}')
self.assertEqual(f'expr={ {x: y for x, y in [(1, 2), ]} }',
'expr={1: 2}')
def test_character_name(self):
self.assertEqual(f'{4}\N{GREEK CAPITAL LETTER DELTA}{3}',
'4\N{GREEK CAPITAL LETTER DELTA}3')
self.assertEqual(f'{{}}\N{GREEK CAPITAL LETTER DELTA}{3}',
'{}\N{GREEK CAPITAL LETTER DELTA}3')
def test_not_equal(self):
# There's a special test for this because there's a special
# case in the f-string parser to look for != as not ending an
......@@ -620,20 +677,14 @@ f'{a * x()}'"""
# Not a conversion, but show that ! is allowed in a format spec.
self.assertEqual(f'{3.14:!<10.10}', '3.14!!!!!!')
self.assertEqual(f'{"\N{GREEK CAPITAL LETTER DELTA}"}', '\u0394')
self.assertEqual(f'{"\N{GREEK CAPITAL LETTER DELTA}"!r}', "'\u0394'")
self.assertEqual(f'{"\N{GREEK CAPITAL LETTER DELTA}"!a}', "'\\u0394'")
self.assertAllRaise(SyntaxError, 'f-string: invalid conversion character',
["f'{3!g}'",
"f'{3!A}'",
"f'{3!A}'",
"f'{3!A}'",
"f'{3!3}'",
"f'{3!G}'",
"f'{3!!}'",
"f'{3!:}'",
"f'{3!\N{GREEK CAPITAL LETTER DELTA}}'",
"f'{3! s}'", # no space before conversion char
"f'{x!\\x00:.<10}'",
])
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
......@@ -663,10 +714,10 @@ f'{a * x()}'"""
"f'}'",
"f'x}'",
"f'x}x'",
r"f'\u007b}'",
# Can't have { or } in a format spec.
"f'{3:}>10}'",
r"f'{3:\\}>10}'",
"f'{3:}}>10}'",
])
......@@ -680,16 +731,13 @@ f'{a * x()}'"""
"f'{3!s:3'",
"f'x{'",
"f'x{x'",
"f'{x'",
"f'{3:s'",
"f'{{{'",
"f'{{}}{'",
"f'{'",
])
self.assertAllRaise(SyntaxError, 'invalid syntax',
[r"f'{3:\\{>10}'",
])
# But these are just normal strings.
self.assertEqual(f'{"{"}', '{')
self.assertEqual(f'{"}"}', '}')
......@@ -778,33 +826,11 @@ f'{a * x()}'"""
"'": 'squote',
'foo': 'bar',
}
self.assertEqual(f'{d["\'"]}', 'squote')
self.assertEqual(f"{d['\"']}", 'dquote')
self.assertEqual(f'''{d["'"]}''', 'squote')
self.assertEqual(f"""{d['"']}""", 'dquote')
self.assertEqual(f'{d["foo"]}', 'bar')
self.assertEqual(f"{d['foo']}", 'bar')
self.assertEqual(f'{d[\'foo\']}', 'bar')
self.assertEqual(f"{d[\"foo\"]}", 'bar')
def test_escaped_quotes(self):
d = {'"': 'a',
"'": 'b'}
self.assertEqual(fr"{d['\"']}", 'a')
self.assertEqual(fr'{d["\'"]}', 'b')
self.assertEqual(fr"{'\"'}", '"')
self.assertEqual(fr'{"\'"}', "'")
self.assertEqual(f'{"\\"3"}', '"3')
self.assertAllRaise(SyntaxError, 'f-string: unterminated string',
[r'''f'{"""\\}' ''', # Backslash at end of expression
])
self.assertAllRaise(SyntaxError, 'unexpected character after line continuation',
[r"rf'{3\}'",
])
if __name__ == '__main__':
......
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