1  """
 2  Rule: D-SCHEMA-04 - text normalization
 3  Type: semantic | Output: binary
 4  Description: Reject when NFKC normalization is not applied to text fields.
 5  Spec reference: 8.1.1
 6  """
 7  
 8  # TODO: Implement NFKC normalization validation
 9  # Input: NIP-35 event dict with tags field
10  # Output: {"passed": bool}
11  #
12  # Steps:
13  #   1. Extract text fields (title, summary) from tags
14  #   2. For each field, apply unicodedata.normalize('NFKC', text)
15  #   3. Compare normalized form with original
16  #   4. Return {"passed": False} if any field differs from normalized form
17  #
18  # Edge cases:
19  #   - Missing text fields
20  #   - Empty strings (already normalized)
21  #   - Already normalized text (most common case)
22  #
23  # Dependencies: unicodedata (stdlib)
24  # Estimated complexity: Low (15-20) lines
25  # Priority: Medium (improves search consistency and prevents homoglyph attacks)
26  
27  from simple_types import BinaryRuleResult, Nip35Kind2003Event
28  
29  
30  def main(entry: Nip35Kind2003Event) -> BinaryRuleResult:
31      """Placeholder: deterministic pass-through."""
32      return {"passed": True}