mirror of
https://github.com/python/cpython.git
synced 2025-11-03 23:21:29 +00:00
Issue #24965: Implement PEP 498 "Literal String Interpolation". Documentation is still needed, I'll open an issue for that.
This commit is contained in:
Eric V. Smith
parent
aed8830af3
commit
235a6f0984
9 changed files with 1965 additions and 63 deletions
|
|
@ -201,9 +201,10 @@ enum _expr_kind {BoolOp_kind=1, BinOp_kind=2, UnaryOp_kind=3, Lambda_kind=4,
|
|||
SetComp_kind=9, DictComp_kind=10, GeneratorExp_kind=11,
|
||||
Await_kind=12, Yield_kind=13, YieldFrom_kind=14,
|
||||
Compare_kind=15, Call_kind=16, Num_kind=17, Str_kind=18,
|
||||
Bytes_kind=19, NameConstant_kind=20, Ellipsis_kind=21,
|
||||
Attribute_kind=22, Subscript_kind=23, Starred_kind=24,
|
||||
Name_kind=25, List_kind=26, Tuple_kind=27};
|
||||
FormattedValue_kind=19, JoinedStr_kind=20, Bytes_kind=21,
|
||||
NameConstant_kind=22, Ellipsis_kind=23, Attribute_kind=24,
|
||||
Subscript_kind=25, Starred_kind=26, Name_kind=27,
|
||||
List_kind=28, Tuple_kind=29};
|
||||
struct _expr {
|
||||
enum _expr_kind kind;
|
||||
union {
|
||||
|
|
@ -296,6 +297,16 @@ struct _expr {
|
|||
string s;
|
||||
} Str;
|
||||
|
||||
struct {
|
||||
expr_ty value;
|
||||
int conversion;
|
||||
expr_ty format_spec;
|
||||
} FormattedValue;
|
||||
|
||||
struct {
|
||||
asdl_seq *values;
|
||||
} JoinedStr;
|
||||
|
||||
struct {
|
||||
bytes s;
|
||||
} Bytes;
|
||||
|
|
@ -543,6 +554,12 @@ expr_ty _Py_Call(expr_ty func, asdl_seq * args, asdl_seq * keywords, int
|
|||
expr_ty _Py_Num(object n, int lineno, int col_offset, PyArena *arena);
|
||||
#define Str(a0, a1, a2, a3) _Py_Str(a0, a1, a2, a3)
|
||||
expr_ty _Py_Str(string s, int lineno, int col_offset, PyArena *arena);
|
||||
#define FormattedValue(a0, a1, a2, a3, a4, a5) _Py_FormattedValue(a0, a1, a2, a3, a4, a5)
|
||||
expr_ty _Py_FormattedValue(expr_ty value, int conversion, expr_ty format_spec,
|
||||
int lineno, int col_offset, PyArena *arena);
|
||||
#define JoinedStr(a0, a1, a2, a3) _Py_JoinedStr(a0, a1, a2, a3)
|
||||
expr_ty _Py_JoinedStr(asdl_seq * values, int lineno, int col_offset, PyArena
|
||||
*arena);
|
||||
#define Bytes(a0, a1, a2, a3) _Py_Bytes(a0, a1, a2, a3)
|
||||
expr_ty _Py_Bytes(bytes s, int lineno, int col_offset, PyArena *arena);
|
||||
#define NameConstant(a0, a1, a2, a3) _Py_NameConstant(a0, a1, a2, a3)
|
||||
|
|
|
|||
715
Lib/test/test_fstring.py
Normal file
715
Lib/test/test_fstring.py
Normal file
|
|
@ -0,0 +1,715 @@
|
|||
import ast
|
||||
import types
|
||||
import decimal
|
||||
import unittest
|
||||
|
||||
a_global = 'global variable'
|
||||
|
||||
# You could argue that I'm too strict in looking for specific error
|
||||
# values with assertRaisesRegex, but without it it's way too easy to
|
||||
# make a syntax error in the test strings. Especially with all of the
|
||||
# triple quotes, raw strings, backslashes, etc. I think it's a
|
||||
# worthwhile tradeoff. When I switched to this method, I found many
|
||||
# examples where I wasn't testing what I thought I was.
|
||||
|
||||
class TestCase(unittest.TestCase):
|
||||
def assertAllRaise(self, exception_type, regex, error_strings):
|
||||
for str in error_strings:
|
||||
with self.subTest(str=str):
|
||||
with self.assertRaisesRegex(exception_type, regex):
|
||||
eval(str)
|
||||
|
||||
def test__format__lookup(self):
|
||||
# Make sure __format__ is looked up on the type, not the instance.
|
||||
class X:
|
||||
def __format__(self, spec):
|
||||
return 'class'
|
||||
|
||||
x = X()
|
||||
|
||||
# Add a bound __format__ method to the 'y' instance, but not
|
||||
# the 'x' instance.
|
||||
y = X()
|
||||
y.__format__ = types.MethodType(lambda self, spec: 'instance', y)
|
||||
|
||||
self.assertEqual(f'{y}', format(y))
|
||||
self.assertEqual(f'{y}', 'class')
|
||||
self.assertEqual(format(x), format(y))
|
||||
|
||||
# __format__ is not called this way, but still make sure it
|
||||
# returns what we expect (so we can make sure we're bypassing
|
||||
# it).
|
||||
self.assertEqual(x.__format__(''), 'class')
|
||||
self.assertEqual(y.__format__(''), 'instance')
|
||||
|
||||
# This is how __format__ is actually called.
|
||||
self.assertEqual(type(x).__format__(x, ''), 'class')
|
||||
self.assertEqual(type(y).__format__(y, ''), 'class')
|
||||
|
||||
def test_ast(self):
|
||||
# Inspired by http://bugs.python.org/issue24975
|
||||
class X:
|
||||
def __init__(self):
|
||||
self.called = False
|
||||
def __call__(self):
|
||||
self.called = True
|
||||
return 4
|
||||
x = X()
|
||||
expr = """
|
||||
a = 10
|
||||
f'{a * x()}'"""
|
||||
t = ast.parse(expr)
|
||||
c = compile(t, '', 'exec')
|
||||
|
||||
# Make sure x was not called.
|
||||
self.assertFalse(x.called)
|
||||
|
||||
# Actually run the code.
|
||||
exec(c)
|
||||
|
||||
# Make sure x was called.
|
||||
self.assertTrue(x.called)
|
||||
|
||||
def test_literal_eval(self):
|
||||
# With no expressions, an f-string is okay.
|
||||
self.assertEqual(ast.literal_eval("f'x'"), 'x')
|
||||
self.assertEqual(ast.literal_eval("f'x' 'y'"), 'xy')
|
||||
|
||||
# But this should raise an error.
|
||||
with self.assertRaisesRegex(ValueError, 'malformed node or string'):
|
||||
ast.literal_eval("f'x{3}'")
|
||||
|
||||
# As should this, which uses a different ast node
|
||||
with self.assertRaisesRegex(ValueError, 'malformed node or string'):
|
||||
ast.literal_eval("f'{3}'")
|
||||
|
||||
def test_ast_compile_time_concat(self):
|
||||
x = ['']
|
||||
|
||||
expr = """x[0] = 'foo' f'{3}'"""
|
||||
t = ast.parse(expr)
|
||||
c = compile(t, '', 'exec')
|
||||
exec(c)
|
||||
self.assertEqual(x[0], 'foo3')
|
||||
|
||||
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',
|
||||
[r"""f'{"x'""",
|
||||
r"""f'{"x}'""",
|
||||
r"""f'{("x'""",
|
||||
r"""f'{("x}'""",
|
||||
])
|
||||
|
||||
def test_mismatched_parens(self):
|
||||
self.assertAllRaise(SyntaxError, 'f-string: mismatched',
|
||||
["f'{((}'",
|
||||
])
|
||||
|
||||
def test_double_braces(self):
|
||||
self.assertEqual(f'{{', '{')
|
||||
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'a}}b', 'a}b')
|
||||
|
||||
self.assertEqual(f'{{{10}', '{10')
|
||||
self.assertEqual(f'}}{10}', '}10')
|
||||
self.assertEqual(f'}}{{{10}', '}{10')
|
||||
self.assertEqual(f'}}a{{{10}', '}a{10')
|
||||
|
||||
self.assertEqual(f'{10}{{', '10{')
|
||||
self.assertEqual(f'{10}}}', '10}')
|
||||
self.assertEqual(f'{10}}}{{', '10}{')
|
||||
self.assertEqual(f'{10}}}a{{' '}', '10}a{}')
|
||||
|
||||
# Inside of strings, don't interpret doubled brackets.
|
||||
self.assertEqual(f'{"{{}}"}', '{{}}')
|
||||
|
||||
self.assertAllRaise(TypeError, 'unhashable type',
|
||||
["f'{ {{}} }'", # dict in a set
|
||||
])
|
||||
|
||||
def test_compile_time_concat(self):
|
||||
x = 'def'
|
||||
self.assertEqual('abc' f'## {x}ghi', 'abc## defghi')
|
||||
self.assertEqual('abc' f'{x}' 'ghi', 'abcdefghi')
|
||||
self.assertEqual('abc' f'{x}' 'gh' f'i{x:4}', 'abcdefghidef ')
|
||||
self.assertEqual('{x}' f'{x}', '{x}def')
|
||||
self.assertEqual('{x' f'{x}', '{xdef')
|
||||
self.assertEqual('{x}' f'{x}', '{x}def')
|
||||
self.assertEqual('{{x}}' f'{x}', '{{x}}def')
|
||||
self.assertEqual('{{x' f'{x}', '{{xdef')
|
||||
self.assertEqual('x}}' f'{x}', 'x}}def')
|
||||
self.assertEqual(f'{x}' 'x}}', 'defx}}')
|
||||
self.assertEqual(f'{x}' '', 'def')
|
||||
self.assertEqual('' f'{x}' '', 'def')
|
||||
self.assertEqual('' f'{x}', 'def')
|
||||
self.assertEqual(f'{x}' '2', 'def2')
|
||||
self.assertEqual('1' f'{x}' '2', '1def2')
|
||||
self.assertEqual('1' f'{x}', '1def')
|
||||
self.assertEqual(f'{x}' f'-{x}', 'def-def')
|
||||
self.assertEqual('' f'', '')
|
||||
self.assertEqual('' f'' '', '')
|
||||
self.assertEqual('' f'' '' f'', '')
|
||||
self.assertEqual(f'', '')
|
||||
self.assertEqual(f'' '', '')
|
||||
self.assertEqual(f'' '' f'', '')
|
||||
self.assertEqual(f'' '' f'' '', '')
|
||||
|
||||
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
|
||||
["f'{3' f'}'", # can't concat to get a valid f-string
|
||||
])
|
||||
|
||||
def test_comments(self):
|
||||
# These aren't comments, since they're in strings.
|
||||
d = {'#': 'hash'}
|
||||
self.assertEqual(f'{"#"}', '#')
|
||||
self.assertEqual(f'{d["#"]}', 'hash')
|
||||
|
||||
self.assertAllRaise(SyntaxError, "f-string cannot include '#'",
|
||||
["f'{1#}'", # error because the expression becomes "(1#)"
|
||||
"f'{3(#)}'",
|
||||
])
|
||||
|
||||
def test_many_expressions(self):
|
||||
# Create a string with many expressions in it. Note that
|
||||
# because we have a space in here as a literal, we're actually
|
||||
# going to use twice as many ast nodes: one for each literal
|
||||
# plus one for each expression.
|
||||
def build_fstr(n, extra=''):
|
||||
return "f'" + ('{x} ' * n) + extra + "'"
|
||||
|
||||
x = 'X'
|
||||
width = 1
|
||||
|
||||
# Test around 256.
|
||||
for i in range(250, 260):
|
||||
self.assertEqual(eval(build_fstr(i)), (x+' ')*i)
|
||||
|
||||
# Test concatenating 2 largs fstrings.
|
||||
self.assertEqual(eval(build_fstr(255)*256), (x+' ')*(255*256))
|
||||
|
||||
s = build_fstr(253, '{x:{width}} ')
|
||||
self.assertEqual(eval(s), (x+' ')*254)
|
||||
|
||||
# Test lots of expressions and constants, concatenated.
|
||||
s = "f'{1}' 'x' 'y'" * 1024
|
||||
self.assertEqual(eval(s), '1xy' * 1024)
|
||||
|
||||
def test_format_specifier_expressions(self):
|
||||
width = 10
|
||||
precision = 4
|
||||
value = decimal.Decimal('12.34567')
|
||||
self.assertEqual(f'result: {value:{width}.{precision}}', 'result: 12.35')
|
||||
self.assertEqual(f'result: {value:{width!r}.{precision}}', 'result: 12.35')
|
||||
self.assertEqual(f'result: {value:{width:0}.{precision:1}}', 'result: 12.35')
|
||||
self.assertEqual(f'result: {value:{1}{0:0}.{precision:1}}', 'result: 12.35')
|
||||
self.assertEqual(f'result: {value:{ 1}{ 0:0}.{ precision:1}}', 'result: 12.35')
|
||||
self.assertEqual(f'{10:#{1}0x}', ' 0xa')
|
||||
self.assertEqual(f'{10:{"#"}1{0}{"x"}}', ' 0xa')
|
||||
self.assertEqual(f'{-10:-{"#"}1{0}x}', ' -0xa')
|
||||
self.assertEqual(f'{-10:{"-"}#{1}0{"x"}}', ' -0xa')
|
||||
self.assertEqual(f'{10:#{3 != {4:5} and width}x}', ' 0xa')
|
||||
|
||||
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
|
||||
["""f'{"s"!r{":10"}}'""",
|
||||
|
||||
# This looks like a nested format spec.
|
||||
])
|
||||
|
||||
self.assertAllRaise(SyntaxError, "invalid syntax",
|
||||
[# Invalid sytax inside a nested spec.
|
||||
"f'{4:{/5}}'",
|
||||
])
|
||||
|
||||
self.assertAllRaise(SyntaxError, "f-string: expressions nested too deeply",
|
||||
[# Can't nest format specifiers.
|
||||
"f'result: {value:{width:{0}}.{precision:1}}'",
|
||||
])
|
||||
|
||||
self.assertAllRaise(SyntaxError, 'f-string: invalid conversion character',
|
||||
[# No expansion inside conversion or for
|
||||
# the : or ! itself.
|
||||
"""f'{"s"!{"r"}}'""",
|
||||
])
|
||||
|
||||
def test_side_effect_order(self):
|
||||
class X:
|
||||
def __init__(self):
|
||||
self.i = 0
|
||||
def __format__(self, spec):
|
||||
self.i += 1
|
||||
return str(self.i)
|
||||
|
||||
x = X()
|
||||
self.assertEqual(f'{x} {x}', '1 2')
|
||||
|
||||
def test_missing_expression(self):
|
||||
self.assertAllRaise(SyntaxError, 'f-string: empty expression not allowed',
|
||||
["f'{}'",
|
||||
"f'{ }'"
|
||||
"f' {} '",
|
||||
"f'{!r}'",
|
||||
"f'{ !r}'",
|
||||
"f'{10:{ }}'",
|
||||
"f' { } '",
|
||||
r"f'{\n}'",
|
||||
r"f'{\n \n}'",
|
||||
])
|
||||
|
||||
def test_parens_in_expressions(self):
|
||||
self.assertEqual(f'{3,}', '(3,)')
|
||||
|
||||
# Add these because when an expression is evaluated, parens
|
||||
# are added around it. But we shouldn't go from an invalid
|
||||
# expression to a valid one. The added parens are just
|
||||
# supposed to allow whitespace (including newlines).
|
||||
self.assertAllRaise(SyntaxError, 'invalid syntax',
|
||||
["f'{,}'",
|
||||
"f'{,}'", # this is (,), which is an error
|
||||
])
|
||||
|
||||
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
|
||||
["f'{3)+(4}'",
|
||||
])
|
||||
|
||||
self.assertAllRaise(SyntaxError, 'EOL while scanning string literal',
|
||||
["f'{\n}'",
|
||||
])
|
||||
|
||||
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
|
||||
self.assertEqual(f'{(lambda y:x*y)("8")!r}', "'88888'")
|
||||
self.assertEqual(f'{(lambda y:x*y)("8")!r:10}', "'88888' ")
|
||||
self.assertEqual(f'{(lambda y:x*y)("8"):10}', "88888 ")
|
||||
|
||||
# lambda doesn't work without parens, because the colon
|
||||
# makes the parser think it's a format_spec
|
||||
self.assertAllRaise(SyntaxError, 'unexpected EOF while parsing',
|
||||
["f'{lambda x:x}'",
|
||||
])
|
||||
|
||||
def test_yield(self):
|
||||
# Not terribly useful, but make sure the yield turns
|
||||
# a function into a generator
|
||||
def fn(y):
|
||||
f'y:{yield y*2}'
|
||||
|
||||
g = fn(4)
|
||||
self.assertEqual(next(g), 8)
|
||||
|
||||
def test_yield_send(self):
|
||||
def fn(x):
|
||||
yield f'x:{yield (lambda i: x * i)}'
|
||||
|
||||
g = fn(10)
|
||||
the_lambda = next(g)
|
||||
self.assertEqual(the_lambda(4), 40)
|
||||
self.assertEqual(g.send('string'), 'x:string')
|
||||
|
||||
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')
|
||||
self.assertEqual(f'{"x" """eric"s"""}', 'xeric"s')
|
||||
self.assertEqual(f'{"""eric"s""" "y"}', 'eric"sy')
|
||||
self.assertEqual(f'{"""x""" """eric"s""" "y"}', 'xeric"sy')
|
||||
self.assertEqual(f'{"""x""" """eric"s""" """y"""}', 'xeric"sy')
|
||||
self.assertEqual(f'{r"""x""" """eric"s""" """y"""}', 'xeric"sy')
|
||||
|
||||
def test_multiple_vars(self):
|
||||
x = 98
|
||||
y = 'abc'
|
||||
self.assertEqual(f'{x}{y}', '98abc')
|
||||
|
||||
self.assertEqual(f'X{x}{y}', 'X98abc')
|
||||
self.assertEqual(f'{x}X{y}', '98Xabc')
|
||||
self.assertEqual(f'{x}{y}X', '98abcX')
|
||||
|
||||
self.assertEqual(f'X{x}Y{y}', 'X98Yabc')
|
||||
self.assertEqual(f'X{x}{y}Y', 'X98abcY')
|
||||
self.assertEqual(f'{x}X{y}Y', '98XabcY')
|
||||
|
||||
self.assertEqual(f'X{x}Y{y}Z', 'X98YabcZ')
|
||||
|
||||
def test_closure(self):
|
||||
def outer(x):
|
||||
def inner():
|
||||
return f'x:{x}'
|
||||
return inner
|
||||
|
||||
self.assertEqual(outer('987')(), 'x:987')
|
||||
self.assertEqual(outer(7)(), 'x:7')
|
||||
|
||||
def test_arguments(self):
|
||||
y = 2
|
||||
def f(x, width):
|
||||
return f'x={x*y:{width}}'
|
||||
|
||||
self.assertEqual(f('foo', 10), 'x=foofoo ')
|
||||
x = 'bar'
|
||||
self.assertEqual(f(10, 10), 'x= 20')
|
||||
|
||||
def test_locals(self):
|
||||
value = 123
|
||||
self.assertEqual(f'v:{value}', 'v:123')
|
||||
|
||||
def test_missing_variable(self):
|
||||
with self.assertRaises(NameError):
|
||||
f'v:{value}'
|
||||
|
||||
def test_missing_format_spec(self):
|
||||
class O:
|
||||
def __format__(self, spec):
|
||||
if not spec:
|
||||
return '*'
|
||||
return spec
|
||||
|
||||
self.assertEqual(f'{O():x}', 'x')
|
||||
self.assertEqual(f'{O()}', '*')
|
||||
self.assertEqual(f'{O():}', '*')
|
||||
|
||||
self.assertEqual(f'{3:}', '3')
|
||||
self.assertEqual(f'{3!s:}', '3')
|
||||
|
||||
def test_global(self):
|
||||
self.assertEqual(f'g:{a_global}', 'g:global variable')
|
||||
self.assertEqual(f'g:{a_global!r}', "g:'global variable'")
|
||||
|
||||
a_local = 'local variable'
|
||||
self.assertEqual(f'g:{a_global} l:{a_local}',
|
||||
'g:global variable l:local variable')
|
||||
self.assertEqual(f'g:{a_global!r}',
|
||||
"g:'global variable'")
|
||||
self.assertEqual(f'g:{a_global} l:{a_local!r}',
|
||||
"g:global variable l:'local variable'")
|
||||
|
||||
self.assertIn("module 'unittest' from", f'{unittest}')
|
||||
|
||||
def test_shadowed_global(self):
|
||||
a_global = 'really a local'
|
||||
self.assertEqual(f'g:{a_global}', 'g:really a local')
|
||||
self.assertEqual(f'g:{a_global!r}', "g:'really a local'")
|
||||
|
||||
a_local = 'local variable'
|
||||
self.assertEqual(f'g:{a_global} l:{a_local}',
|
||||
'g:really a local l:local variable')
|
||||
self.assertEqual(f'g:{a_global!r}',
|
||||
"g:'really a local'")
|
||||
self.assertEqual(f'g:{a_global} l:{a_local!r}',
|
||||
"g:really a local l:'local variable'")
|
||||
|
||||
def test_call(self):
|
||||
def foo(x):
|
||||
return 'x=' + str(x)
|
||||
|
||||
self.assertEqual(f'{foo(10)}', 'x=10')
|
||||
|
||||
def test_nested_fstrings(self):
|
||||
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',
|
||||
["fu''",
|
||||
"uf''",
|
||||
"Fu''",
|
||||
"fU''",
|
||||
"Uf''",
|
||||
"uF''",
|
||||
"ufr''",
|
||||
"urf''",
|
||||
"fur''",
|
||||
"fru''",
|
||||
"rfu''",
|
||||
"ruf''",
|
||||
"FUR''",
|
||||
"Fur''",
|
||||
])
|
||||
|
||||
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
|
||||
# expression. Normally it would, while looking for !s or !r.
|
||||
|
||||
self.assertEqual(f'{3!=4}', 'True')
|
||||
self.assertEqual(f'{3!=4:}', 'True')
|
||||
self.assertEqual(f'{3!=4!s}', 'True')
|
||||
self.assertEqual(f'{3!=4!s:.3}', 'Tru')
|
||||
|
||||
def test_conversions(self):
|
||||
self.assertEqual(f'{3.14:10.10}', ' 3.14')
|
||||
self.assertEqual(f'{3.14!s:10.10}', '3.14 ')
|
||||
self.assertEqual(f'{3.14!r:10.10}', '3.14 ')
|
||||
self.assertEqual(f'{3.14!a:10.10}', '3.14 ')
|
||||
|
||||
self.assertEqual(f'{"a"}', 'a')
|
||||
self.assertEqual(f'{"a"!r}', "'a'")
|
||||
self.assertEqual(f'{"a"!a}', "'a'")
|
||||
|
||||
# Not a conversion.
|
||||
self.assertEqual(f'{"a!r"}', "a!r")
|
||||
|
||||
# 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!!}'",
|
||||
"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 '}'",
|
||||
["f'{x!s{y}}'",
|
||||
"f'{3!ss}'",
|
||||
"f'{3!ss:}'",
|
||||
"f'{3!ss:s}'",
|
||||
])
|
||||
|
||||
def test_assignment(self):
|
||||
self.assertAllRaise(SyntaxError, 'invalid syntax',
|
||||
["f'' = 3",
|
||||
"f'{0}' = x",
|
||||
"f'{x}' = x",
|
||||
])
|
||||
|
||||
def test_del(self):
|
||||
self.assertAllRaise(SyntaxError, 'invalid syntax',
|
||||
["del f''",
|
||||
"del '' f''",
|
||||
])
|
||||
|
||||
def test_mismatched_braces(self):
|
||||
self.assertAllRaise(SyntaxError, "f-string: single '}' is not allowed",
|
||||
["f'{{}'",
|
||||
"f'{{}}}'",
|
||||
"f'}'",
|
||||
"f'x}'",
|
||||
"f'x}x'",
|
||||
|
||||
# Can't have { or } in a format spec.
|
||||
"f'{3:}>10}'",
|
||||
r"f'{3:\\}>10}'",
|
||||
"f'{3:}}>10}'",
|
||||
])
|
||||
|
||||
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
|
||||
["f'{3:{{>10}'",
|
||||
"f'{3'",
|
||||
"f'{3!'",
|
||||
"f'{3:'",
|
||||
"f'{3!s'",
|
||||
"f'{3!s:'",
|
||||
"f'{3!s:3'",
|
||||
"f'x{'",
|
||||
"f'x{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'{"}"}', '}')
|
||||
self.assertEqual(f'{3:{"}"}>10}', '}}}}}}}}}3')
|
||||
self.assertEqual(f'{2:{"{"}>10}', '{{{{{{{{{2')
|
||||
|
||||
def test_if_conditional(self):
|
||||
# There's special logic in compile.c to test if the
|
||||
# conditional for an if (and while) are constants. Exercise
|
||||
# that code.
|
||||
|
||||
def test_fstring(x, expected):
|
||||
flag = 0
|
||||
if f'{x}':
|
||||
flag = 1
|
||||
else:
|
||||
flag = 2
|
||||
self.assertEqual(flag, expected)
|
||||
|
||||
def test_concat_empty(x, expected):
|
||||
flag = 0
|
||||
if '' f'{x}':
|
||||
flag = 1
|
||||
else:
|
||||
flag = 2
|
||||
self.assertEqual(flag, expected)
|
||||
|
||||
def test_concat_non_empty(x, expected):
|
||||
flag = 0
|
||||
if ' ' f'{x}':
|
||||
flag = 1
|
||||
else:
|
||||
flag = 2
|
||||
self.assertEqual(flag, expected)
|
||||
|
||||
test_fstring('', 2)
|
||||
test_fstring(' ', 1)
|
||||
|
||||
test_concat_empty('', 2)
|
||||
test_concat_empty(' ', 1)
|
||||
|
||||
test_concat_non_empty('', 1)
|
||||
test_concat_non_empty(' ', 1)
|
||||
|
||||
def test_empty_format_specifier(self):
|
||||
x = 'test'
|
||||
self.assertEqual(f'{x}', 'test')
|
||||
self.assertEqual(f'{x:}', 'test')
|
||||
self.assertEqual(f'{x!s:}', 'test')
|
||||
self.assertEqual(f'{x!r:}', "'test'")
|
||||
|
||||
def test_str_format_differences(self):
|
||||
d = {'a': 'string',
|
||||
0: 'integer',
|
||||
}
|
||||
a = 0
|
||||
self.assertEqual(f'{d[0]}', 'integer')
|
||||
self.assertEqual(f'{d["a"]}', 'string')
|
||||
self.assertEqual(f'{d[a]}', 'integer')
|
||||
self.assertEqual('{d[a]}'.format(d=d), 'string')
|
||||
self.assertEqual('{d[0]}'.format(d=d), 'integer')
|
||||
|
||||
def test_invalid_expressions(self):
|
||||
self.assertAllRaise(SyntaxError, 'invalid syntax',
|
||||
[r"f'{a[4)}'",
|
||||
r"f'{a(4]}'",
|
||||
])
|
||||
|
||||
def test_loop(self):
|
||||
for i in range(1000):
|
||||
self.assertEqual(f'i:{i}', 'i:' + str(i))
|
||||
|
||||
def test_dict(self):
|
||||
d = {'"': 'dquote',
|
||||
"'": '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__':
|
||||
unittest.main()
|
||||
|
|
@ -19,6 +19,11 @@ Core and Builtins
|
|||
argument list of a function declaration. For example, "def f(*, a =
|
||||
3,): pass" is now legal. Patch from Mark Dickinson.
|
||||
|
||||
- Issue #24965: Implement PEP 498 "Literal String Interpolation". This
|
||||
allows you to embed expressions inside f-strings, which are
|
||||
converted to normal strings at run time. Given x=3, then
|
||||
f'value={x}' == 'value=3'. Patch by Eric V. Smith.
|
||||
|
||||
Library
|
||||
-------
|
||||
|
||||
|
|
|
|||
|
|
@ -71,6 +71,8 @@ module Python
|
|||
| Call(expr func, expr* args, keyword* keywords)
|
||||
| Num(object n) -- a number as a PyObject.
|
||||
| Str(string s) -- need to specify raw, unicode, etc?
|
||||
| FormattedValue(expr value, int? conversion, expr? format_spec)
|
||||
| JoinedStr(expr* values)
|
||||
| Bytes(bytes s)
|
||||
| NameConstant(singleton value)
|
||||
| Ellipsis
|
||||
|
|
|
|||
|
|
@ -1477,17 +1477,19 @@ tok_get(struct tok_state *tok, char **p_start, char **p_end)
|
|||
nonascii = 0;
|
||||
if (is_potential_identifier_start(c)) {
|
||||
/* Process b"", r"", u"", br"" and rb"" */
|
||||
int saw_b = 0, saw_r = 0, saw_u = 0;
|
||||
int saw_b = 0, saw_r = 0, saw_u = 0, saw_f = 0;
|
||||
while (1) {
|
||||
if (!(saw_b || saw_u) && (c == 'b' || c == 'B'))
|
||||
if (!(saw_b || saw_u || saw_f) && (c == 'b' || c == 'B'))
|
||||
saw_b = 1;
|
||||
/* Since this is a backwards compatibility support literal we don't
|
||||
want to support it in arbitrary order like byte literals. */
|
||||
else if (!(saw_b || saw_u || saw_r) && (c == 'u' || c == 'U'))
|
||||
else if (!(saw_b || saw_u || saw_r || saw_f) && (c == 'u' || c == 'U'))
|
||||
saw_u = 1;
|
||||
/* ur"" and ru"" are not supported */
|
||||
else if (!(saw_r || saw_u) && (c == 'r' || c == 'R'))
|
||||
saw_r = 1;
|
||||
else if (!(saw_f || saw_b || saw_u) && (c == 'f' || c == 'F'))
|
||||
saw_f = 1;
|
||||
else
|
||||
break;
|
||||
c = tok_nextc(tok);
|
||||
|
|
|
|||
|
|
@ -285,6 +285,18 @@ _Py_IDENTIFIER(s);
|
|||
static char *Str_fields[]={
|
||||
"s",
|
||||
};
|
||||
static PyTypeObject *FormattedValue_type;
|
||||
_Py_IDENTIFIER(conversion);
|
||||
_Py_IDENTIFIER(format_spec);
|
||||
static char *FormattedValue_fields[]={
|
||||
"value",
|
||||
"conversion",
|
||||
"format_spec",
|
||||
};
|
||||
static PyTypeObject *JoinedStr_type;
|
||||
static char *JoinedStr_fields[]={
|
||||
"values",
|
||||
};
|
||||
static PyTypeObject *Bytes_type;
|
||||
static char *Bytes_fields[]={
|
||||
"s",
|
||||
|
|
@ -917,6 +929,11 @@ static int init_types(void)
|
|||
if (!Num_type) return 0;
|
||||
Str_type = make_type("Str", expr_type, Str_fields, 1);
|
||||
if (!Str_type) return 0;
|
||||
FormattedValue_type = make_type("FormattedValue", expr_type,
|
||||
FormattedValue_fields, 3);
|
||||
if (!FormattedValue_type) return 0;
|
||||
JoinedStr_type = make_type("JoinedStr", expr_type, JoinedStr_fields, 1);
|
||||
if (!JoinedStr_type) return 0;
|
||||
Bytes_type = make_type("Bytes", expr_type, Bytes_fields, 1);
|
||||
if (!Bytes_type) return 0;
|
||||
NameConstant_type = make_type("NameConstant", expr_type,
|
||||
|
|
@ -2062,6 +2079,42 @@ Str(string s, int lineno, int col_offset, PyArena *arena)
|
|||
return p;
|
||||
}
|
||||
|
||||
expr_ty
|
||||
FormattedValue(expr_ty value, int conversion, expr_ty format_spec, int lineno,
|
||||
int col_offset, PyArena *arena)
|
||||
{
|
||||
expr_ty p;
|
||||
if (!value) {
|
||||
PyErr_SetString(PyExc_ValueError,
|
||||
"field value is required for FormattedValue");
|
||||
return NULL;
|
||||
}
|
||||
p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
|
||||
if (!p)
|
||||
return NULL;
|
||||
p->kind = FormattedValue_kind;
|
||||
p->v.FormattedValue.value = value;
|
||||
p->v.FormattedValue.conversion = conversion;
|
||||
p->v.FormattedValue.format_spec = format_spec;
|
||||
p->lineno = lineno;
|
||||
p->col_offset = col_offset;
|
||||
return p;
|
||||
}
|
||||
|
||||
expr_ty
|
||||
JoinedStr(asdl_seq * values, int lineno, int col_offset, PyArena *arena)
|
||||
{
|
||||
expr_ty p;
|
||||
p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
|
||||
if (!p)
|
||||
return NULL;
|
||||
p->kind = JoinedStr_kind;
|
||||
p->v.JoinedStr.values = values;
|
||||
p->lineno = lineno;
|
||||
p->col_offset = col_offset;
|
||||
return p;
|
||||
}
|
||||
|
||||
expr_ty
|
||||
Bytes(bytes s, int lineno, int col_offset, PyArena *arena)
|
||||
{
|
||||
|
|
@ -3161,6 +3214,34 @@ ast2obj_expr(void* _o)
|
|||
goto failed;
|
||||
Py_DECREF(value);
|
||||
break;
|
||||
case FormattedValue_kind:
|
||||
result = PyType_GenericNew(FormattedValue_type, NULL, NULL);
|
||||
if (!result) goto failed;
|
||||
value = ast2obj_expr(o->v.FormattedValue.value);
|
||||
if (!value) goto failed;
|
||||
if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
|
||||
goto failed;
|
||||
Py_DECREF(value);
|
||||
value = ast2obj_int(o->v.FormattedValue.conversion);
|
||||
if (!value) goto failed;
|
||||
if (_PyObject_SetAttrId(result, &PyId_conversion, value) == -1)
|
||||
goto failed;
|
||||
Py_DECREF(value);
|
||||
value = ast2obj_expr(o->v.FormattedValue.format_spec);
|
||||
if (!value) goto failed;
|
||||
if (_PyObject_SetAttrId(result, &PyId_format_spec, value) == -1)
|
||||
goto failed;
|
||||
Py_DECREF(value);
|
||||
break;
|
||||
case JoinedStr_kind:
|
||||
result = PyType_GenericNew(JoinedStr_type, NULL, NULL);
|
||||
if (!result) goto failed;
|
||||
value = ast2obj_list(o->v.JoinedStr.values, ast2obj_expr);
|
||||
if (!value) goto failed;
|
||||
if (_PyObject_SetAttrId(result, &PyId_values, value) == -1)
|
||||
goto failed;
|
||||
Py_DECREF(value);
|
||||
break;
|
||||
case Bytes_kind:
|
||||
result = PyType_GenericNew(Bytes_type, NULL, NULL);
|
||||
if (!result) goto failed;
|
||||
|
|
@ -6022,6 +6103,86 @@ obj2ast_expr(PyObject* obj, expr_ty* out, PyArena* arena)
|
|||
if (*out == NULL) goto failed;
|
||||
return 0;
|
||||
}
|
||||
isinstance = PyObject_IsInstance(obj, (PyObject*)FormattedValue_type);
|
||||
if (isinstance == -1) {
|
||||
return 1;
|
||||
}
|
||||
if (isinstance) {
|
||||
expr_ty value;
|
||||
int conversion;
|
||||
expr_ty format_spec;
|
||||
|
||||
if (_PyObject_HasAttrId(obj, &PyId_value)) {
|
||||
int res;
|
||||
tmp = _PyObject_GetAttrId(obj, &PyId_value);
|
||||
if (tmp == NULL) goto failed;
|
||||
res = obj2ast_expr(tmp, &value, arena);
|
||||
if (res != 0) goto failed;
|
||||
Py_CLEAR(tmp);
|
||||
} else {
|
||||
PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from FormattedValue");
|
||||
return 1;
|
||||
}
|
||||
if (exists_not_none(obj, &PyId_conversion)) {
|
||||
int res;
|
||||
tmp = _PyObject_GetAttrId(obj, &PyId_conversion);
|
||||
if (tmp == NULL) goto failed;
|
||||
res = obj2ast_int(tmp, &conversion, arena);
|
||||
if (res != 0) goto failed;
|
||||
Py_CLEAR(tmp);
|
||||
} else {
|
||||
conversion = 0;
|
||||
}
|
||||
if (exists_not_none(obj, &PyId_format_spec)) {
|
||||
int res;
|
||||
tmp = _PyObject_GetAttrId(obj, &PyId_format_spec);
|
||||
if (tmp == NULL) goto failed;
|
||||
res = obj2ast_expr(tmp, &format_spec, arena);
|
||||
if (res != 0) goto failed;
|
||||
Py_CLEAR(tmp);
|
||||
} else {
|
||||
format_spec = NULL;
|
||||
}
|
||||
*out = FormattedValue(value, conversion, format_spec, lineno,
|
||||
col_offset, arena);
|
||||
if (*out == NULL) goto failed;
|
||||
return 0;
|
||||
}
|
||||
isinstance = PyObject_IsInstance(obj, (PyObject*)JoinedStr_type);
|
||||
if (isinstance == -1) {
|
||||
return 1;
|
||||
}
|
||||
if (isinstance) {
|
||||
asdl_seq* values;
|
||||
|
||||
if (_PyObject_HasAttrId(obj, &PyId_values)) {
|
||||
int res;
|
||||
Py_ssize_t len;
|
||||
Py_ssize_t i;
|
||||
tmp = _PyObject_GetAttrId(obj, &PyId_values);
|
||||
if (tmp == NULL) goto failed;
|
||||
if (!PyList_Check(tmp)) {
|
||||
PyErr_Format(PyExc_TypeError, "JoinedStr field \"values\" must be a list, not a %.200s", tmp->ob_type->tp_name);
|
||||
goto failed;
|
||||
}
|
||||
len = PyList_GET_SIZE(tmp);
|
||||
values = _Py_asdl_seq_new(len, arena);
|
||||
if (values == NULL) goto failed;
|
||||
for (i = 0; i < len; i++) {
|
||||
expr_ty value;
|
||||
res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
|
||||
if (res != 0) goto failed;
|
||||
asdl_seq_SET(values, i, value);
|
||||
}
|
||||
Py_CLEAR(tmp);
|
||||
} else {
|
||||
PyErr_SetString(PyExc_TypeError, "required field \"values\" missing from JoinedStr");
|
||||
return 1;
|
||||
}
|
||||
*out = JoinedStr(values, lineno, col_offset, arena);
|
||||
if (*out == NULL) goto failed;
|
||||
return 0;
|
||||
}
|
||||
isinstance = PyObject_IsInstance(obj, (PyObject*)Bytes_type);
|
||||
if (isinstance == -1) {
|
||||
return 1;
|
||||
|
|
@ -7319,6 +7480,10 @@ PyInit__ast(void)
|
|||
if (PyDict_SetItemString(d, "Call", (PyObject*)Call_type) < 0) return NULL;
|
||||
if (PyDict_SetItemString(d, "Num", (PyObject*)Num_type) < 0) return NULL;
|
||||
if (PyDict_SetItemString(d, "Str", (PyObject*)Str_type) < 0) return NULL;
|
||||
if (PyDict_SetItemString(d, "FormattedValue",
|
||||
(PyObject*)FormattedValue_type) < 0) return NULL;
|
||||
if (PyDict_SetItemString(d, "JoinedStr", (PyObject*)JoinedStr_type) < 0)
|
||||
return NULL;
|
||||
if (PyDict_SetItemString(d, "Bytes", (PyObject*)Bytes_type) < 0) return
|
||||
NULL;
|
||||
if (PyDict_SetItemString(d, "NameConstant", (PyObject*)NameConstant_type) <
|
||||
|
|
|
|||
981
Python/ast.c
981
Python/ast.c
File diff suppressed because it is too large
Load diff
117
Python/compile.c
117
Python/compile.c
|
|
@ -731,6 +731,7 @@ compiler_set_qualname(struct compiler *c)
|
|||
return 1;
|
||||
}
|
||||
|
||||
|
||||
/* Allocate a new block and return a pointer to it.
|
||||
Returns NULL on error.
|
||||
*/
|
||||
|
|
@ -3209,6 +3210,117 @@ compiler_call(struct compiler *c, expr_ty e)
|
|||
e->v.Call.keywords);
|
||||
}
|
||||
|
||||
static int
|
||||
compiler_joined_str(struct compiler *c, expr_ty e)
|
||||
{
|
||||
/* Concatenate parts of a string using ''.join(parts). There are
|
||||
probably better ways of doing this.
|
||||
|
||||
This is used for constructs like "'x=' f'{42}'", which have to
|
||||
be evaluated at compile time. */
|
||||
|
||||
static PyObject *empty_string;
|
||||
static PyObject *join_string;
|
||||
|
||||
if (!empty_string) {
|
||||
empty_string = PyUnicode_FromString("");
|
||||
if (!empty_string)
|
||||
return 0;
|
||||
}
|
||||
if (!join_string) {
|
||||
join_string = PyUnicode_FromString("join");
|
||||
if (!join_string)
|
||||
return 0;
|
||||
}
|
||||
|
||||
ADDOP_O(c, LOAD_CONST, empty_string, consts);
|
||||
ADDOP_NAME(c, LOAD_ATTR, join_string, names);
|
||||
VISIT_SEQ(c, expr, e->v.JoinedStr.values);
|
||||
ADDOP_I(c, BUILD_LIST, asdl_seq_LEN(e->v.JoinedStr.values));
|
||||
ADDOP_I(c, CALL_FUNCTION, 1);
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* Note that this code uses the builtin functions format(), str(),
|
||||
repr(), and ascii(). You can break this code, or make it do odd
|
||||
things, by redefining those functions. */
|
||||
static int
|
||||
compiler_formatted_value(struct compiler *c, expr_ty e)
|
||||
{
|
||||
PyObject *conversion_name = NULL;
|
||||
|
||||
static PyObject *format_string;
|
||||
static PyObject *str_string;
|
||||
static PyObject *repr_string;
|
||||
static PyObject *ascii_string;
|
||||
|
||||
if (!format_string) {
|
||||
format_string = PyUnicode_InternFromString("format");
|
||||
if (!format_string)
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (!str_string) {
|
||||
str_string = PyUnicode_InternFromString("str");
|
||||
if (!str_string)
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (!repr_string) {
|
||||
repr_string = PyUnicode_InternFromString("repr");
|
||||
if (!repr_string)
|
||||
return 0;
|
||||
}
|
||||
if (!ascii_string) {
|
||||
ascii_string = PyUnicode_InternFromString("ascii");
|
||||
if (!ascii_string)
|
||||
return 0;
|
||||
}
|
||||
|
||||
ADDOP_NAME(c, LOAD_GLOBAL, format_string, names);
|
||||
|
||||
/* If needed, convert via str, repr, or ascii. */
|
||||
if (e->v.FormattedValue.conversion != -1) {
|
||||
switch (e->v.FormattedValue.conversion) {
|
||||
case 's':
|
||||
conversion_name = str_string;
|
||||
break;
|
||||
case 'r':
|
||||
conversion_name = repr_string;
|
||||
break;
|
||||
case 'a':
|
||||
conversion_name = ascii_string;
|
||||
break;
|
||||
default:
|
||||
PyErr_SetString(PyExc_SystemError,
|
||||
"Unrecognized conversion character");
|
||||
return 0;
|
||||
}
|
||||
ADDOP_NAME(c, LOAD_GLOBAL, conversion_name, names);
|
||||
}
|
||||
|
||||
/* Evaluate the value. */
|
||||
VISIT(c, expr, e->v.FormattedValue.value);
|
||||
|
||||
/* If needed, convert via str, repr, or ascii. */
|
||||
if (conversion_name) {
|
||||
/* Call the function we previously pushed. */
|
||||
ADDOP_I(c, CALL_FUNCTION, 1);
|
||||
}
|
||||
|
||||
/* If we have a format spec, use format(value, format_spec). Otherwise,
|
||||
use the single argument form. */
|
||||
if (e->v.FormattedValue.format_spec) {
|
||||
VISIT(c, expr, e->v.FormattedValue.format_spec);
|
||||
ADDOP_I(c, CALL_FUNCTION, 2);
|
||||
} else {
|
||||
/* No format spec specified, call format(value). */
|
||||
ADDOP_I(c, CALL_FUNCTION, 1);
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* shared code between compiler_call and compiler_class */
|
||||
static int
|
||||
compiler_call_helper(struct compiler *c,
|
||||
|
|
@ -3878,6 +3990,10 @@ compiler_visit_expr(struct compiler *c, expr_ty e)
|
|||
case Str_kind:
|
||||
ADDOP_O(c, LOAD_CONST, e->v.Str.s, consts);
|
||||
break;
|
||||
case JoinedStr_kind:
|
||||
return compiler_joined_str(c, e);
|
||||
case FormattedValue_kind:
|
||||
return compiler_formatted_value(c, e);
|
||||
case Bytes_kind:
|
||||
ADDOP_O(c, LOAD_CONST, e->v.Bytes.s, consts);
|
||||
break;
|
||||
|
|
@ -4784,4 +4900,3 @@ PyAST_Compile(mod_ty mod, const char *filename, PyCompilerFlags *flags,
|
|||
{
|
||||
return PyAST_CompileEx(mod, filename, flags, -1, arena);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -1439,6 +1439,14 @@ symtable_visit_expr(struct symtable *st, expr_ty e)
|
|||
VISIT_SEQ(st, expr, e->v.Call.args);
|
||||
VISIT_SEQ_WITH_NULL(st, keyword, e->v.Call.keywords);
|
||||
break;
|
||||
case FormattedValue_kind:
|
||||
VISIT(st, expr, e->v.FormattedValue.value);
|
||||
if (e->v.FormattedValue.format_spec)
|
||||
VISIT(st, expr, e->v.FormattedValue.format_spec);
|
||||
break;
|
||||
case JoinedStr_kind:
|
||||
VISIT_SEQ(st, expr, e->v.JoinedStr.values);
|
||||
break;
|
||||
case Num_kind:
|
||||
case Str_kind:
|
||||
case Bytes_kind:
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue