/usr/share/racket/collects/pkg/name.rkt is in racket-common 6.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(require racket/list
racket/contract
racket/format
racket/string
net/url)
(provide
package-source-format?
(contract-out
[package-source->name+type (->* (string? (or/c #f package-source-format?))
(#:complain (-> string? string? any)
#:must-infer-name? boolean?
#:link-dirs? boolean?)
(values (or/c #f string?) (or/c #f package-source-format?)))]
[package-source->name (->* (string?)
((or/c #f package-source-format?))
(or/c #f string?))]
[package-source->path (->* (string?)
((or/c #f 'file 'dir 'link 'static-link))
path?)]))
(define rx:package-name #rx"^[-_a-zA-Z0-9]+$")
(define rx:archive #rx"[.](plt|zip|tar|tgz|tar[.]gz)$")
(define rx:git #rx"[.]git$")
(define package-source-format?
(or/c 'name 'file 'dir 'git 'github 'clone 'file-url 'dir-url 'link 'static-link))
(define (validate-name name complain inferred?)
(and name
(cond
[(regexp-match? rx:package-name name)
name]
[(equal? name "")
(complain (~a (if inferred? "inferred " "")
"package name is empty"))
#f]
[else
(complain (~a (if inferred? "inferred " "")
"package name includes disallowed characters"))
#f])))
(define (extract-archive-name name+ext complain)
(validate-name
(and name+ext
(path->string
(if (regexp-match #rx#"[.]tar[.]gz$" name+ext)
(path-replace-suffix (path-replace-suffix name+ext #"") #"")
(path-replace-suffix name+ext #""))))
complain
#t))
(define (last-non-empty p)
(cond
[(null? p) #f]
[else (or (last-non-empty (cdr p))
(and (not (equal? "" (path/param-path (car p))))
(path/param-path (car p))))]))
(define (num-empty p)
(let loop ([p (reverse p)])
(cond
[(null? p) 0]
[else (if (equal? "" (path/param-path (car p)))
(add1 (loop (cdr p)))
0)])))
(define (extract-git-name url p complain-name)
(let ([a (assoc 'path (url-query url))])
(define sub (and a (cdr a) (string-split (cdr a) "/")))
(if (pair? sub)
(validate-name (last sub) complain-name #t)
(let ([s (last-non-empty p)])
(validate-name (regexp-replace #rx"[.]git$" s "") complain-name #t)))))
(define (string-and-regexp-match? rx s)
(and (string? s)
(regexp-match? rx s)))
(define-syntax-rule (cor v complain)
(or v (begin complain #f)))
(define (package-source->name+type s type
#:link-dirs? [link-dirs? #f]
#:complain [complain-proc void]
#:must-infer-name? [must-infer-name? #f])
;; returns (values inferred-name inferred-type);
;; if `type' is given it should be returned, but name can be #f;
;; type should not be #f for a non-#f name
(define (complain msg)
(complain-proc s msg))
(define complain-name
(if must-infer-name? complain void))
(define (parse-path s [type type])
(cond
[(if type
(eq? type 'file)
(and (path-string? s)
(regexp-match rx:archive s)))
(define name
(and (cor (path-string? s)
(complain "ill-formed path"))
(cor (regexp-match rx:archive s)
(complain "path does not end with a recognized archive suffix"))
(let ()
(define-values (base name+ext dir?) (if (path-string? s)
(split-path s)
(values #f #f #f)))
(extract-archive-name name+ext complain-name))))
(values name 'file)]
[(if type
(or (eq? type 'dir)
(eq? type 'link)
(eq? type 'static-link))
(path-string? s))
(unless (path-string? s)
(complain "ill-formed path"))
(define-values (base name dir?) (if (path-string? s)
(split-path s)
(values #f #f #f)))
(define dir-name (and (cor (path? name)
(if (not name)
(complain "no elements in path")
(complain "ending path element is not a name")))
(path->string name)))
(values (validate-name dir-name complain-name #t)
(or type (and dir-name (if link-dirs? 'link 'dir))))]
[else
(complain "ill-formed path")
(values #f #f)]))
(cond
[(if type
(eq? type 'name)
(regexp-match? rx:package-name s))
(values (validate-name s complain #f) 'name)]
[(and (eq? type 'clone)
(not (regexp-match? #rx"^(?:https?|git(?:hub)?)://" s)))
(complain "repository URL must start 'http', 'https', 'git', or 'github'")
(values #f 'clone)]
[(and (eq? type 'github)
(not (regexp-match? #rx"^git(?:hub)?://" s)))
(package-source->name+type
(string-append "git://github.com/" s)
'github
#:link-dirs? link-dirs?
#:complain complain-proc
#:must-infer-name? must-infer-name?)]
[(if type
(or (eq? type 'github)
(eq? type 'git)
(eq? type 'clone)
(eq? type 'file-url)
(eq? type 'dir-url))
(regexp-match? #rx"^(https?|github|git)://" s))
(define url (with-handlers ([exn:fail? (lambda (exn) #f)])
(string->url s)))
(define-values (name name-type)
(if url
(let ([p (url-path url)])
(cond
[(if type
(or (eq? type 'github)
(and (eq? type 'clone)
(equal? (url-scheme url) "github")))
(or (equal? (url-scheme url) "github")
(equal? (url-scheme url) "git")))
(unless (or (equal? (url-scheme url) "github")
(equal? (url-scheme url) "git"))
(complain "URL scheme is not 'git' or 'github'"))
(define github?
(or (eq? type 'github)
(equal? (url-scheme url) "github")
(equal? (url-host url) "github.com")))
(define name
(and (cor (pair? p)
(complain "URL path is empty"))
(or (not github?)
(cor (equal? "github.com" (url-host url))
(complain "URL host is not 'github.com'")))
(if (equal? (url-scheme url) "git")
;; git://
(and (if github?
(and
(cor (or (= (length p) 2)
(and (= (length p) 3)
(equal? "" (path/param-path (caddr p)))))
(complain "URL does not have two path elements (name and repo)"))
(cor (and (string? (path/param-path (car p)))
(string? (path/param-path (cadr p))))
(complain "URL includes a directory indicator as an element")))
(and
(cor (last-non-empty p)
(complain "URL path is empty"))
(cor (string? (last-non-empty p))
(complain "URL path ends with a directory indicator"))
(cor ((num-empty p) . < . 2)
(complain "URL path ends with two empty elements"))))
(let ([a (assoc 'path (url-query url))])
(or (not a)
(not (cdr a))
(cor (for/and ([e (in-list (string-split (cdr a) "/"))])
(not (or (equal? e ".")
(equal? e ".."))))
(complain "path query includes a directory indicator"))))
(extract-git-name url p complain-name))
;; github://
(let ([p (if (equal? "" (path/param-path (last p)))
(reverse (cdr (reverse p)))
p)])
(and (cor ((length p) . >= . 3)
(complain "URL does not have at least three path elements"))
(cor (andmap string? (map path/param-path p))
(complain "URL includes a directory indicator"))
(validate-name
(if (= (length p) 3)
(path/param-path (second (reverse p)))
(last-non-empty p))
complain-name
#t))))))
(values name (or type
(if github?
'github
'git)))]
[(if type
(eq? type 'file-url)
(and (pair? p)
(path/param? (last p))
(string-and-regexp-match? rx:archive (path/param-path (last p)))))
(define name
(and (cor (pair? p)
(complain "URL path is empty"))
(cor (string-and-regexp-match? rx:archive (path/param-path (last p)))
(complain "URL does not end with a recognized archive suffix"))
(extract-archive-name (last-non-empty p) complain-name)))
(values name 'file-url)]
[(if type
(or (eq? type 'git)
(eq? type 'clone))
(and (last-non-empty p)
(string-and-regexp-match? rx:git (last-non-empty p))
((num-empty p) . < . 2)))
(define name
(and (cor (last-non-empty p)
(complain "URL path is empty"))
(cor ((num-empty p) . < . 2)
(complain "URL path ends with two empty elements"))
(cor (string? (last-non-empty p))
(complain "URL path ends with a directory indicator"))
(extract-git-name url p complain-name)))
(values name 'git)]
[else
(define name
(and (cor (pair? p)
(complain "URL path is empty"))
(cor (last-non-empty p)
(complain "URL has no non-empty path"))
(cor (string? (last-non-empty p))
(complain "URL's last path element is a directory indicator"))
(validate-name (last-non-empty p) complain-name #t)))
(values name 'dir-url)]))
(values #f #f)))
(values (validate-name name complain-name #f)
(or type (and name-type)))]
[(and (not type)
(regexp-match #rx"^file://" s))
=> (lambda (m)
(define u (string->url s))
(define query-type
(for/or ([q (in-list (url-query u))])
(and (eq? (car q) 'type)
(cond
[(equal? (cdr q) "link") 'link]
[(equal? (cdr q) "static-link") 'static-link]
[(equal? (cdr q) "file") 'file]
[(equal? (cdr q) "dir") 'dir]
[else
(complain "URL contains an unrecognized `type' query")
'error]))))
(if (eq? query-type 'error)
(values #f 'dir)
;; Note that we're ignoring other query & fragment parts, if any:
(parse-path (url->path u) (or query-type type))))]
[(and (not type)
(regexp-match? #rx"^[a-zA-Z]*://" s))
(complain "unrecognized URL scheme")
(values #f #f)]
[else
(parse-path s)]))
(define (package-source->name s [given-type #f])
(define-values (name type) (package-source->name+type s given-type))
name)
(define (package-source->path s [type #f])
((if (memq type '(dir link static-link))
path->directory-path
values)
(cond
[(regexp-match? #rx"^file://" s)
(url->path (string->url s))]
[else
(string->path s)])))
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