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Jim Mussared 692d36d779 py: Implement partial PEP-498 (f-string) support. 
This implements (most of) the PEP-498 spec for f-strings and is based on
https://github.com/micropython/micropython/pull/4998 by @klardotsh.

It is implemented in the lexer as a syntax translation to `str.format`:
  f"{a}" --> "{}".format(a)

It also supports:
  f"{a=}" --> "a={}".format(a)

This is done by extracting the arguments into a temporary vstr buffer,
then after the string has been tokenized, the lexer input queue is saved
and the contents of the temporary vstr buffer are injected into the lexer
instead.

There are four main limitations:
- raw f-strings (`fr` or `rf` prefixes) are not supported and will raise
  `SyntaxError: raw f-strings are not supported`.

- literal concatenation of f-strings with adjacent strings will fail
    "{}" f"{a}" --> "{}{}".format(a)    (str.format will incorrectly use
                                         the braces from the non-f-string)
    f"{a}" f"{a}" --> "{}".format(a) "{}".format(a) (cannot concatenate)

- PEP-498 requires the full parser to understand the interpolated
  argument, however because this entirely runs in the lexer it cannot
  resolve nested braces in expressions like
    f"{'}'}"

- The !r, !s, and !a conversions are not supported.

Includes tests and cpydiffs.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
 		2021-08-14 16:58:40 +10:00
..
modules tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
modules2/subpkg tests/cpydiff/core_import_split_ns_pkgs: Test for split namespace packages. 2017-05-03 17:16:19 +03:00
modules3 tests/cpydiff: Add cpydiff test for __all__ used in imported package. 2020-05-02 17:41:04 +10:00
builtin_next_arg2.py tests/cpydiff: Fix markup where "`" (xref) was used instead of "``" (code). 2017-12-03 15:32:09 +02:00
core_class_delnotimpl.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
core_class_mro.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
core_class_supermultiple.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
core_class_superproperty.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
core_fstring_concat.py py: Implement partial PEP-498 (f-string) support. 2021-08-14 16:58:40 +10:00
core_fstring_parser.py py: Implement partial PEP-498 (f-string) support. 2021-08-14 16:58:40 +10:00
core_fstring_raw.py py: Implement partial PEP-498 (f-string) support. 2021-08-14 16:58:40 +10:00
core_fstring_repr.py py: Implement partial PEP-498 (f-string) support. 2021-08-14 16:58:40 +10:00
core_function_argcount.py tests/cpydiff/core_arguments: Move under Functions subsection. 2017-07-09 13:36:28 +03:00
core_function_moduleattr.py tests/cpydiff: Add test and workaround for function.__module__ attr. 2021-05-16 11:06:46 +10:00
core_function_userattr.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
core_generator_noexit.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
core_import_all.py tests/cpydiff: Add cpydiff test for __all__ used in imported package. 2020-05-02 17:41:04 +10:00
core_import_path.py tests/cpydiff/core_import_path: Test showing difference in package.__path__. 2017-05-03 12:22:53 +03:00
core_import_prereg.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
core_import_split_ns_pkgs.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
core_locals.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
core_locals_eval.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
module_array_comparison.py py/objarray: Prohibit comparison of mismatching types. 2021-05-13 22:16:14 +10:00
module_array_constructor.py tests/cpydiff: Add test for array constructor with overflowing value. 2021-06-13 10:30:14 +10:00
modules_array_containment.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
modules_array_deletion.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
modules_array_subscrstep.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
modules_deque.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
modules_json_nonserializable.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
modules_os_environ.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
modules_os_getenv.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
modules_os_getenv_argcount.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
modules_random_getrandbits.py extmod/modurandom: Add error message when getrandbits has bad value. 2021-05-30 16:41:30 +10:00
modules_random_randint.py extmod/modurandom: Add error message when getrandbits has bad value. 2021-05-30 16:41:30 +10:00
modules_struct_fewargs.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
modules_struct_manyargs.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
modules_struct_whitespace_in_format.py tests/cpydiff/modules_struct_whitespace_in_format: Run black. 2021-07-06 18:19:55 -05:00
modules_sys_stdassign.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
syntax_assign_expr.py tests/cpydiff: Add CPy diff test for assignment expression behaviour. 2020-06-16 22:06:47 +10:00
syntax_spaces.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
syntax_unicode_nameesc.py tests/cpydiff: Add initial set of tests for uPy-CPython differences. 2017-02-20 16:50:34 +11:00
types_bytearray_sliceassign.py tests/cpydiff: Add initial set of tests for uPy-CPython differences. 2017-02-20 16:50:34 +11:00
types_bytes_format.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_bytes_keywords.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_bytes_subscrstep.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_dict_keys_set.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_exception_attrs.py py/objexcept: Support errno attribute on OSError exceptions. 2021-04-23 22:03:46 +10:00
types_exception_chaining.py tests/cpydiff: Add initial set of tests for uPy-CPython differences. 2017-02-20 16:50:34 +11:00
types_exception_instancevar.py tests/cpydiff/: Improve wording, add more workarounds. 2017-07-09 14:33:55 +03:00
types_exception_loops.py tests/cpydiff/: Improve wording, add more workarounds. 2017-07-09 14:33:55 +03:00
types_exception_subclassinit.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_float_rounding.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_int_bit_length.py extmod/modurandom: Add error message when getrandbits has bad value. 2021-05-30 16:41:30 +10:00
types_int_subclassconv.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_list_delete_subscrstep.py tests/cpydiff/: Improve wording, add more workarounds. 2017-07-09 14:33:55 +03:00
types_list_store_noniter.py tests/cpydiff: Add a test for storing iterable to a list slice. 2017-02-20 17:22:12 +11:00
types_list_store_subscrstep.py tests/cpydiff/: Improve wording, add more workarounds. 2017-07-09 14:33:55 +03:00
types_str_endswith.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_str_formatsubscr.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_str_keywords.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_str_ljust_rjust.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_str_rsplitnone.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_str_subscrstep.py tests: Format all Python code with black, except tests in basics subdir. 2020-03-30 13:21:58 +11:00
types_tuple_subscrstep.py tests/cpydiff: Add initial set of tests for uPy-CPython differences. 2017-02-20 16:50:34 +11:00