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uuid: 'uuid' macro supports more UUID types.

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* gnu/system/uuid.scm (string->uuid): Turn 'type' into an optional
argument.
(uuid): Add clauses to allow for an optional 'type' parameter.
This commit is contained in:
Ludovic Courtès 2017-09-06 10:35:01 +02:00
parent 075681d350
commit ce094b4663
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1 changed files with 14 additions and 8 deletions
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22
gnu/system/uuid.scm
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@ -206,7 +206,7 @@ (define %uuid-printers
('iso9660 => iso9660-uuid->string)
('fat32 'fat => fat32-uuid->string)))
(define* (string->uuid str #:key (type 'dce))
(define* (string->uuid str #:optional (type 'dce))
"Parse STR as a UUID of the given TYPE. On success, return the
corresponding bytevector; otherwise return #f."
(match (vhash-assq type %uuid-parsers)
@ -233,17 +233,23 @@ (define* (bytevector->uuid bv #:optional (type 'dce))
(define-syntax uuid
(lambda (s)
"Return the UUID object corresponding to the given UUID representation."
;; TODO: Extend to types other than DCE.
(syntax-case s ()
((_ str)
(string? (syntax->datum #'str))
(syntax-case s (quote)
((_ str (quote type))
(and (string? (syntax->datum #'str))
(identifier? #'type))
;; A literal string: do the conversion at expansion time.
(let ((bv (string->uuid (syntax->datum #'str))))
(let ((bv (string->uuid (syntax->datum #'str)
(syntax->datum #'type))))
(unless bv
(syntax-violation 'uuid "invalid UUID" s))
#`(make-uuid 'dce #,(datum->syntax #'str bv))))
#`(make-uuid 'type #,(datum->syntax s bv))))
((_ str)
#'(make-uuid 'dce (string->uuid str))))))
(string? (syntax->datum #'str))
#'(uuid str 'dce))
((_ str)
#'(make-uuid 'dce (string->uuid str 'dce)))
((_ str type)
#'(make-uuid type (string->uuid str type))))))
(define uuid->string
;; Convert the given bytevector or UUID object, to the corresponding UUID