126 lines
3.4 KiB
Scheme
126 lines
3.4 KiB
Scheme
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; Copyright (c) 1993, 1994 Richard Kelsey and Jonathan Rees. See file COPYING.
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; Hairier exceptions & interrupts.
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; Enable generic arithmetic, informative error messages, etc.
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; Deal with optional arguments, etc. to primitives.
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; This is not necessarily the cleanest way to do this, and certainly not
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; the most efficient, but for the time being it's the most expedient.
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; We don't want to depend on tables. But if we did, we might do this:
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;(define (closure-hash closure)
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; (let ((cv (vector-ref (closure-template closure) 0))) ;template-ref
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; (do ((h 0 (+ h (code-vector-ref cv i)))
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; (i (- (code-vector-length cv) 1) (- i 1)))
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; ((< i 0) h))))
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;(define wna-handlers (make-table closure-hash))
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(define-exception-handler (enum op check-nargs=)
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(lambda (opcode args)
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(let ((probe (assq (car args) *wna-handlers*)))
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(if probe
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((cdr probe) (cadr args))
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(signal-exception opcode args)))))
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(define *wna-handlers* '())
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(define (define-wna-handler proc handler)
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(set! *wna-handlers* (cons (cons proc handler) *wna-handlers*)))
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(define op/check-nargs= (enum op check-nargs=))
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(define (wna-lose proc args)
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(signal-exception op/check-nargs= (list proc args)))
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(define-wna-handler + (lambda (args) (reduce + 0 args)))
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(define-wna-handler * (lambda (args) (reduce * 1 args)))
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(define-wna-handler -
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(lambda (args)
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(if (and (not (null? args))
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(null? (cdr args)))
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(- 0 (car args))
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(wna-lose - args))))
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(define-wna-handler /
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(lambda (args)
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(if (and (not (null? args))
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(null? (cdr args)))
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(/ 1 (car args))
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(wna-lose / args))))
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(define-wna-handler make-vector
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(lambda (args)
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(if (and (not (null? args))
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(null? (cdr args)))
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(make-vector (car args) (unspecific))
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(wna-lose make-vector args))))
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(define-wna-handler make-string
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(lambda (args)
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(if (and (not (null? args))
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(null? (cdr args)))
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(make-string (car args) #\?)
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(wna-lose make-string args))))
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(define-wna-handler apply
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(lambda (args)
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(if (null? args)
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(wna-lose apply args))
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(apply (car args)
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(let recur ((l (cdr args)))
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(if (null? (cdr l))
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(car l)
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(cons (car l) (recur (cdr l))))))))
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(define-wna-handler read-char
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(lambda (args)
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(if (null? args)
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(read-char (input-port-option args))
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(wna-lose read-char args))))
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(define-wna-handler peek-char
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(lambda (args)
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(if (null? args)
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(peek-char (input-port-option args))
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(wna-lose peek-char args))))
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(define-wna-handler char-ready?
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(lambda (args)
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(if (null? args)
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(char-ready? (input-port-option args))
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(wna-lose char-ready? args))))
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(define-wna-handler write-char
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(lambda (args)
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(if (and (not (null? args))
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(null? (cdr args)))
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(write-char (car args) (output-port-option (cdr args)))
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(wna-lose write-char args))))
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(define-wna-handler error
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(lambda (args)
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(really-signal-condition (cons 'error args))))
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(define (comparison-wna compare) ;Not really R4RS compliant.
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(lambda (args)
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(if (and (not (null? args))
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(not (null? (cdr args))))
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(let loop ((x (car args))
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(args (cdr args)))
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(let ((y (car args))
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(args (cdr args)))
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(if (compare x y)
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(if (null? args)
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#t
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(loop y args))
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#f)))
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(wna-lose compare args))))
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(define-wna-handler = (comparison-wna =))
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(define-wna-handler < (comparison-wna <))
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(define-wna-handler > (comparison-wna >))
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(define-wna-handler <= (comparison-wna <=))
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(define-wna-handler >= (comparison-wna >=))
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