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#lang scheme/base
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; BASE.plt
;;
;;
;; Bonzai Lab, LLC. All rights reserved.
;;
;; Licensed under LGPL.
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; args.ss - utility for helping processing syntax-based arguments (does not belong here)
;; yc 9/21/2009 - first version
;; yc 9/25/2009 - move from port.plt to base.plt
(require (for-syntax scheme/base)
scheme/match)
;; convert an argument (and an optional argument) into an identifier
;; p => p
;; (p v ...) => p
(define (arg->identifier stx)
(syntax-case stx ()
(p
(symbol? (syntax->datum #'p))
#'p)
;; an optional arg.
((p . _)
#'p)))
;; (a (b v1) #:c (c v2)) => (a b c)
(define (args->identifiers stx)
(syntax-case stx ()
(()
#'())
((p . rest)
(keyword? (syntax->datum #'p))
(args->identifiers #'rest))
((p . rest)
#`(#,(arg->identifier #'p) . #,(args->identifiers #'rest)))))
(define (args->kw+identifiers stx)
(syntax-case stx ()
(()
#'())
((p . rest)
(keyword? (syntax->datum #'p))
#`(p . #,(args->identifiers #'rest)))
((p . rest)
#`(#,(arg->identifier #'p) . #,(args->identifiers #'rest)))))
(define (args->kw-identifiers stx)
(syntax-case stx ()
(()
#'())
((p . rest)
(keyword? (syntax->datum #'p))
#`(p . #,(args->identifiers #'rest)))
((p . rest)
(args->kw-identifiers #'rest))))
;; (trace args->kw-identifiers)
(define (args->kw-args stx)
(syntax-case stx ()
(()
#'())
((p . rest)
(keyword? (syntax->datum #'p))
#'(p . rest))
((p . rest)
(args->kw-args #'rest))))
(define (args->non-kw-identifiers stx)
(syntax-case stx ()
(()
#'())
((p . rest)
(keyword? (syntax->datum #'p))
#'())
((p . rest)
#`(#,(arg->identifier #'p) . #,(args->non-kw-identifiers #'rest)))))
(define (args->non-kw-args stx)
(syntax-case stx ()
(()
#'())
((p . rest)
(keyword? (syntax->datum #'p))
#'())
((p . rest)
#`(p . #,(args->non-kw-args #'rest)))))
(provide arg->identifier
args->identifiers
args->kw+identifiers
args->kw-identifiers
args->non-kw-identifiers
args->kw-args
args->non-kw-args
)
;;; typed args...
;;; a typed args look like an optional argument, except that
;;; it has the following:
;;; (id type?) (id type? default)
(define (typed-arg? stx)
(match (syntax->datum stx)
((list (? symbol? _) _) #t)
((list (? symbol? _) _ _) #t)
(else #f)))
(define (typed-arg->arg stx)
(syntax-case stx ()
((p type)
#'p)
((p type default)
#'(p default))))
(define (typed-args->args stx)
(syntax-case stx ()
(()
#'())
((p . rest)
(keyword? (syntax->datum #'p))
#`(p . #,(typed-args->args #'rest)))
((p . rest)
#`(#,(typed-arg->arg #'p) . #,(typed-args->args #'rest)))))
(define (typed-arg->type stx)
(syntax-case stx ()
((p type)
#'type)
((p type default)
#'type)))
(define (typed-args->types stx)
(syntax-case stx ()
(()
#'())
((p . rest)
(keyword? (syntax->datum #'p))
(typed-args->types #'rest))
((p . rest)
#`(#,(typed-arg->type #'p) . #,(typed-args->types #'rest)))))
(provide typed-args->args
typed-args->types
typed-arg->arg
typed-arg->type
)
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