Make SubFox production-ready with parallel translation and UI controls

.venv/lib/python3.10/site-packages/pip/_internal/req/pep723.py

@@ -0,0 +1,41 @@
+import re
+from typing import Any
+
+from pip._internal.utils.compat import tomllib
+
+REGEX = r"(?m)^# /// (?P<type>[a-zA-Z0-9-]+)$\s(?P<content>(^#(| .*)$\s)+)^# ///$"
+
+
+class PEP723Exception(ValueError):
+    """Raised to indicate a problem when parsing PEP 723 metadata from a script"""
+
+    def __init__(self, msg: str) -> None:
+        self.msg = msg
+
+
+def pep723_metadata(scriptfile: str) -> dict[str, Any]:
+    with open(scriptfile) as f:
+        script = f.read()
+
+    name = "script"
+    matches = list(
+        filter(lambda m: m.group("type") == name, re.finditer(REGEX, script))
+    )
+
+    if len(matches) > 1:
+        raise PEP723Exception(f"Multiple {name!r} blocks found in {scriptfile!r}")
+    elif len(matches) == 1:
+        content = "".join(
+            line[2:] if line.startswith("# ") else line[1:]
+            for line in matches[0].group("content").splitlines(keepends=True)
+        )
+        try:
+            metadata = tomllib.loads(content)
+        except Exception as exc:
+            raise PEP723Exception(f"Failed to parse TOML in {scriptfile!r}") from exc
+    else:
+        raise PEP723Exception(
+            f"File does not contain {name!r} metadata: {scriptfile!r}"
+        )
+
+    return metadata