Codex
d8a29bfbdd
Implement approved specification #32 and tickets #33-#37. Keep host authentication server-verified and pin session interaction language. Compile scoped base selectors for browser compatibility and retain full gutters during CSS pruning.
24 lines
922 B
Python
24 lines
922 B
Python
"""Session language policy, independent of workspace document content."""
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import re
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_LANGUAGE_TAG = re.compile(
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r"(?P<language>[A-Za-z]{2,8})(?:-(?P<script>[A-Za-z]{4}))?"
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r"(?:-(?P<region>[A-Za-z]{2}|[0-9]{3}))?"
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r"(?P<rest>(?:-(?:[A-Za-z0-9]{5,8}|[0-9][A-Za-z0-9]{3}))*"
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r"(?:-[0-9A-WY-Za-wy-z](?:-[A-Za-z0-9]{2,8})+)*"
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r"(?:-[xX](?:-[A-Za-z0-9]{1,8})+)?)"
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)
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def validate_language_tag(value: str) -> str:
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"""Validate syntax and normalize casing without depending on UI catalogs."""
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match = _LANGUAGE_TAG.fullmatch(value) if isinstance(value, str) else None
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if match is None:
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raise ValueError("interaction_language must be a BCP-47 language tag")
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parts = [match["language"].lower()]
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if match["script"]:
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parts.append(match["script"].title())
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if match["region"]:
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parts.append(match["region"].upper())
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return "-".join(parts) + match["rest"].lower()
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