Sync from v0.13

tools/pre_commit/enforce_regex_import.py

@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+import subprocess
+from pathlib import Path
+
+import regex as re
+
+FORBIDDEN_PATTERNS = re.compile(r"^\s*(?:import\s+re(?:$|\s|,)|from\s+re\s+import)")
+ALLOWED_PATTERNS = [
+    re.compile(r"^\s*import\s+regex\s+as\s+re\s*$"),
+    re.compile(r"^\s*import\s+regex\s*$"),
+]
+
+
+def get_staged_python_files() -> list[str]:
+    try:
+        result = subprocess.run(
+            ["git", "diff", "--cached", "--name-only", "--diff-filter=AM"],
+            capture_output=True,
+            text=True,
+            check=True,
+        )
+        files = result.stdout.strip().split("\n") if result.stdout.strip() else []
+        return [f for f in files if f.endswith(".py")]
+    except subprocess.CalledProcessError:
+        return []
+
+
+def is_forbidden_import(line: str) -> bool:
+    line = line.strip()
+    return bool(
+        FORBIDDEN_PATTERNS.match(line)
+        and not any(pattern.match(line) for pattern in ALLOWED_PATTERNS)
+    )
+
+
+def check_file(filepath: str) -> list[tuple[int, str]]:
+    violations = []
+    try:
+        with open(filepath, encoding="utf-8") as f:
+            for line_num, line in enumerate(f, 1):
+                if is_forbidden_import(line):
+                    violations.append((line_num, line.strip()))
+    except (OSError, UnicodeDecodeError):
+        pass
+    return violations
+
+
+def main() -> int:
+    files = get_staged_python_files()
+    if not files:
+        return 0
+
+    total_violations = 0
+
+    for filepath in files:
+        if not Path(filepath).exists():
+            continue
+
+        if filepath == "setup.py":
+            continue
+
+        violations = check_file(filepath)
+        if violations:
+            print(f"\n❌ {filepath}:")
+            for line_num, line in violations:
+                print(f"  Line {line_num}: {line}")
+                total_violations += 1
+
+    if total_violations > 0:
+        print(f"\n💡 Found {total_violations} violation(s).")
+        print("❌ Please replace 'import re' with 'import regex as re'")
+        print("   Also replace 'from re import ...' with 'from regex import ...'")  # noqa: E501
+        print("✅ Allowed imports:")
+        print("   - import regex as re")
+        print("   - import regex")  # noqa: E501
+        return 1
+
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())