.cairo
2 claimants
2 primary
0 secondary
shared primary (2)
SWH popularity
Distinct files in the full Software Heritage archive (2026-06-04 export), dated by first appearance, following Desmazières, Di Cosmo, Lorentz (MSR 2025). Case-aggregated. citation.
253.0K
total files
243.2K
first seen 2021–2025 (96.1%)
2023
median year (half its files since)
Case variants in archive: .cairo (252.9K), .CAIRO (35), .Cairo (15) — aggregated above.
Attribution status
This extension is attributed to Cairo; Cairo Zero as primary by 2 authoritative claims.
Authoritative sources: ✓ Linguist ✗ Pygments · no claim ✗ Wikidata · no claim ✗ Wikipedia · no claim
Claimants (2)
Languages that list
.cairo among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| Cairo | linguist | primary |
| Cairo Zero | linguist | primary |
Disambiguation rules (2)
Linguist heuristics that decide, by content, which language a
.cairo file actually is.| Rule | Predicts | Kind | Predicates (truncated) | Measured on SWH |
|---|---|---|---|---|
h/linguist/.cairo/0 | Cairo Zero | predicates | [{"kind": "any", "regexes": ["(^(\\s*)%lang(\\s+)([A-Za-z0-9_]+))|(^(\\s*)%builtins(\\s+)([A-Za-z0-9_]+\\s*)*$)|(^(\\s*)from(\\s+)starkware\\.(cairo|starknet)\\.([A-Za-z0-9_.\\s]+?)import)|(,\\s*ap\\+ | |
h/linguist/.cairo/1 | Cairo | default | [] |
SWH-mined examples (0)
No archived examples for .cairo in our local mirror yet.