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r"""Generate tuple mapping overloads.
the problem solved by this script is that of there's no way in current
pep-484 typing to unpack \*args: _T into Tuple[_T]. pep-646 is the first
pep to provide this, but it doesn't work for the actual Tuple class
and also mypy does not have support for pep-646 as of yet. Better pep-646
support would allow us to use a TypeVarTuple with Unpack, but TypeVarTuple
does not have support for sequence operations like ``__getitem__`` and
iteration; there's also no way for TypeVarTuple to be translated back to a
Tuple which does have those things without a combinatoric hardcoding approach
to each length of tuple.
So here, the script creates a map from `*args` to a Tuple directly using a
combinatoric generated code approach.
.. versionadded:: 2.0
"""
# mypy: ignore-errors
from __future__ import annotations
import importlib
import os
from pathlib import Path
import re
import sys
from tempfile import NamedTemporaryFile
import textwrap
from sqlalchemy.util.tool_support import code_writer_cmd
is_posix = os.name == "posix"
sys.path.append(str(Path(__file__).parent.parent))
def process_module(modname: str, filename: str, cmd: code_writer_cmd) -> str:
# use tempfile in same path as the module, or at least in the
# current working directory, so that black / zimports use
# local pyproject.toml
with NamedTemporaryFile(
mode="w",
delete=False,
suffix=".py",
) as buf, open(filename) as orig_py:
indent = ""
in_block = False
current_fnname = given_fnname = None
for line in orig_py:
m = re.match(
r"^( *)# START OVERLOADED FUNCTIONS ([\.\w_]+) ([\w_]+) (\d+)-(\d+)(?: \"(.+)\")?", # noqa: E501
line,
)
if m:
indent = m.group(1)
given_fnname = current_fnname = m.group(2)
if current_fnname.startswith("self."):
use_self = True
current_fnname = current_fnname.split(".")[1]
else:
use_self = False
return_type = m.group(3)
start_index = int(m.group(4))
end_index = int(m.group(5))
extra_args = m.group(6) or ""
cmd.write_status(
f"Generating {start_index}-{end_index} overloads "
f"attributes for "
f"class {'self.' if use_self else ''}{current_fnname} "
f"-> {return_type}\n"
)
in_block = True
buf.write(line)
buf.write(
"\n # code within this block is "
"**programmatically, \n"
" # statically generated** by"
f" tools/{os.path.basename(__file__)}\n\n"
)
for num_args in range(start_index, end_index + 1):
combinations = [
[
f"__ent{arg}: _TCCA[_T{arg}]"
for arg in range(num_args)
]
]
for combination in combinations:
buf.write(
textwrap.indent(
f"""
@overload
def {current_fnname}(
{'self, ' if use_self else ''}{", ".join(combination)}{extra_args}
) -> {return_type}[Tuple[{', '.join(f'_T{i}' for i in range(num_args))}]]:
...
""", # noqa: E501
indent,
)
)
if in_block and line.startswith(
f"{indent}# END OVERLOADED FUNCTIONS {given_fnname}"
):
in_block = False
if not in_block:
buf.write(line)
return buf.name
def run_module(modname: str, cmd: code_writer_cmd) -> None:
cmd.write_status(f"importing module {modname}\n")
mod = importlib.import_module(modname)
destination_path = mod.__file__
assert destination_path is not None
tempfile = process_module(modname, destination_path, cmd)
cmd.run_zimports(tempfile)
cmd.run_black(tempfile)
cmd.write_output_file_from_tempfile(tempfile, destination_path)
def main(cmd: code_writer_cmd) -> None:
for modname in entries:
if cmd.args.module in {"all", modname}:
run_module(modname, cmd)
entries = [
"sqlalchemy.sql._selectable_constructors",
"sqlalchemy.orm.session",
"sqlalchemy.orm.query",
"sqlalchemy.sql.selectable",
"sqlalchemy.sql.dml",
]
if __name__ == "__main__":
cmd = code_writer_cmd(__file__)
with cmd.add_arguments() as parser:
parser.add_argument(
"--module",
choices=entries + ["all"],
default="all",
help="Which file to generate. Default is to regenerate all files",
)
with cmd.run_program():
main(cmd)
|
