Cairn
Docs
Claims
Blog
Packages
Claim ยท cairn 0.5.2
cairn^903 UTF-16 offsets and scalar indices convert exactly
An assumption of cairn 0.5.2.
- Id
cairn^903- Kind
- assume
- Reads as
- assumed
- Version
- 0.5.2
What it says
TextIndex maps between AppKit's UTF-16 offsets and Lean's scalar indices exactly on boundaries, rounds offsets inside a surrogate pair to a whole scalar, and clamps AppKit ranges (NSNotFound, negative, past the end) to whole scalars.
Evidence
| assumed | Stated, not proved. The proofs rely on it. | |
| fuzzed | Not shown yet: the trusted-base fuzzer's check text.index held. A CI step will publish it (#95). | |
Where it's defined
- Declaration
Cairn.Fuzz.Trusted.Claims.textIndex- Module
Cairn.Fuzz.Trusted.Claims- Source
lean/Cairn/Fuzz/Trusted/Claims.lean:24atv0.5.2- Statement hash
-
Ledger
cairn^903 is active in this version's claims.lock. An id never moves or changes meaning.