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Lisp

1 program Added 2026-02-07T11:07:14Z Agent: claude-codeModel: sonnetWebSearch: disabled Evidence Report issue View issues

Aliases: LISP, Lisp (programming language)

Provenance: commit ea0c3d6382 · authored 2026-02-07T12:08:03+01:00 · agent claude-code · model sonnet

Merged records (3)

Sources describe this language in separate records, kept as they are. They were joined by explicit decisions in data/curated/pl_links.csv (concept concept/repo/Lisp); names of merged pages are listed as aliases above.

Lisp repo/Lisp · this page · primary · sources: llm-campaign · evidence
L-51bf494a3f same_as pl/lisp-programming-language: accepted (generic-qualifier, claude-opus-5-5, 2026-09-30)
lisp pl/lisp · record without its own page · sources: esolang, pldb, pygments · Wikipedia · Q132874 · Esolang · PLDB
L-c51830d580 same_as pl/lisp-programming-language: accepted (generic-qualifier, claude-opus-5-5, 2026-09-30) — Esolang page 'Lisp' describes mainstream Lisp (checked 2026-09-30).
Lisp (programming language) pl/lisp-programming-language · had its own page, merged here · sources: wikipedia · Wikipedia · Q132874
L-51bf494a3f same_as repo/Lisp: accepted (generic-qualifier, claude-opus-5-5, 2026-09-30)
L-c51830d580 same_as pl/lisp: accepted (generic-qualifier, claude-opus-5-5, 2026-09-30) — Esolang page 'Lisp' describes mainstream Lisp (checked 2026-09-30).

Sources mentioning this language

8 sources · pl_id: pl/common-lisp

LLM (this repo) · 1 Pldb Linguist Pygments Wikipedia Hyperpolyglot Rosettacode Wikidata · Q132874

Wikipedia infobox ↗

Pulled from the wikimedia/structured-wikipedia snapshot — see data/raw/wikipedia_pl_facts.*.jsonl and pl_fact.csv for the long-table provenance.

Paradigms	multi-paradigm: functional · procedural · reflective · meta
Typing	dynamic, strong
Designed by	Steve Russell · Timothy P. Hart · Mike Levin · John McCarthy
First appeared	1960
Influenced by	Information Processing Language (IPL)

Extensions claimed by this language

15 claims. Each row is one upstream assertion with its strength. SWH column shows file occurrences with that extension across the entire archive.

Extension	Source	Strength	SWH
`.cl`	pygments	primary	590.1K files
`.lisp`	linguist	primary	3.0M files
`.asd`	linguist	secondary	335.0K files
`.cl`	linguist	secondary	590.1K files
`.l`	linguist	secondary	1.0M files
`.lisp`	pygments	secondary	3.0M files
`.lsp`	linguist	secondary	234.6K files
`.ny`	linguist	secondary	3.5K files
`.podsl`	linguist	secondary	—
`.sexp`	linguist	secondary	40.3K files
`.cl`	wikipedia	proposed	590.1K files
`.fasl`	wikipedia	proposed	23.7K files
`.l`	wikipedia	proposed	1.0M files
`.lisp`	wikipedia	proposed	3.0M files
`.lsp`	wikipedia	proposed	234.6K files

Related languages

Le Lisp (0.47)LeLisp (0.47)Lispkit Lisp (0.46)LISP 1.5 (0.42)Lissp (0.42)

Real programs from Software Heritage

No SWH evidence indexed yet for this language. (Either the SWH mining hasn't reached this language's extensions, or no matching files exist in the archive.)

Programs collected by LLM agents experimental · unverified

Gathered by LLM agents during the experiment that started this catalogue. They are not verified: the agent names an origin, but a program can be altered or invented — an audit found one attributed to a file that does not exist, in a syntax the language does not have. Prefer the programs archived by Software Heritage above. The catalogue's goal is the languages themselves, grounded in sources (PLDB, Wikipedia, Rosetta Code, …), with real archived programs; these examples may be dropped.

Factorial with Recursion

Origin · Download · manifest.json · Report

Provenance: commit ea0c3d6382 · authored 2026-02-07T12:08:03+01:00 · agent claude-code · model sonnet · WebSearch disabled

code.lisp · added: 2026-02-07T11:07:14Z

;;; Factorial function in Lisp
;;; Demonstrates recursion and conditional logic

(defun factorial (n)
  "Compute the factorial of N"
  (cond ((zerop n) 1)
        ((< n 0) (error "Factorial not defined for negative numbers"))
        (t (* n (factorial (- n 1))))))

;;; Test the function
(print (factorial 0))  ; Should print 1
(print (factorial 5))  ; Should print 120
(print (factorial 10)) ; Should print 3628800

Disambiguation rules

Linguist heuristic rules that predict this language when one of its claimed extensions is shared with another.

Rule	Ext	Kind	Predicates (truncated)
`h/linguist/.lisp/0`	`.lisp`	predicates	`[{"kind": "any", "regexes": ["^\\s*\\((?i:defun\|in-package\|defpackage) "]}]`
`h/linguist/.cl/0`	`.cl`	predicates	`[{"kind": "any", "regexes": ["^\\s*\\((?i:defun\|in-package\|defpackage) "]}]`
`h/linguist/.lsp/0`	`.lsp`	predicates	`[{"kind": "any", "regexes": ["^\\s*\\((?i:defun\|in-package\|defpackage) "]}]`
`h/linguist/.l/0`	`.l`	predicates	`[{"kind": "any", "regexes": ["\\(def(un\|macro)\\s"]}]`

Contribute — propose a file extension

Tell us where to find evidence about Lisp (mapped to pl/common-lisp). A reference URL is required; at least one of extension or program code must be provided too. A maintainer reviews each submission via a draft PR before anything lands.

File extension (optional) — e.g. .oak. Some PLs (e.g. esolangs) have no convention; leave empty if so. Friendly name (optional)

Reference URL * — public URL where the extension is used (GitHub file, GitLab, spec page, …) Notes (optional) — 1–3 sentences if context helps the maintainer

Optional: attach a program from that URL

If the reference URL points at a single source file you'd like to add as an example program, paste it below. The workflow will write it under languages/Lisp/programs/<sha>/. Keep under ~200 lines.

Title (optional) — e.g. "Factorial", "Quicksort" License guess (optional) — MIT, GPL-2.0, …

Code (optional) — paste verbatim bytes from the reference URL

(or open the pre-filled issue directly)