rules:
  - id: no-bidi-characters
    message: The code must not contain any of Unicode Direction Control Characters
    metadata:
      category: security
      technology:
        - solidity
      cwe: "CWE-837: Improper Enforcement of a Single, Unique Action"
      confidence: HIGH
      likelihood: LOW
      impact: LOW
      subcategory:
          - audit
      references:
        - https://entethalliance.org/specs/ethtrust-sl/v1/#req-1-unicode-bdo
    patterns:
    - pattern-either:
      - pattern-regex: ‪             # left-to-right embedding (LRE)
      - pattern-regex: ‫             # right-to-left embedding (RLE)
      - pattern-regex: ‭             # left-to-right override (LRO)
      - pattern-regex: ‮             # right-to-left override (RLO)
      - pattern-regex: ⁦             # left-to-right isolate (LRI)
      - pattern-regex: ⁧             # right-to-left isolate (RLI)
      - pattern-regex: ⁨             # first strong isolate (FSI)
      - pattern-regex: ‬             # pop directional formatting (PDF)
      - pattern-regex: ⁩             # pop directional isolate (PDI)
    languages: 
      - solidity
    severity: WARNING