74 lines
2.5 KiB
Scheme
74 lines
2.5 KiB
Scheme
;; p l a n t e y e s [ copyright (c) 2009 foam vzw : gpl v3 ]
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#lang scheme/base
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(require scheme/class
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"list-utils.ss")
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(provide (all-defined-out))
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;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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; a message for sending betwixt logic and view side
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(define-serializable-class* message% object% ()
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(init-field
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(name 'none) ; a symbol denoting the type of the message
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(data '())) ; should be an assoc list map of name to values, eg:
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; '((name "archibold") (age 53))
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; shouldn't put logic objects in here - 'raw' data only
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(define/public (get-name)
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name)
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(define/public (get-data arg-name)
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(let ((a (assoc arg-name data)))
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(if a (cadr a) (error "message arg not found " arg-name))))
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(define/public (print)
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(printf "msg: ~a ~a~n" name data))
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(define/public (to-string)
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(string-append (symbol->string name) " " (nvpairs->string data "")))
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(define/public (from-string str)
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(let ((tokens (string-split str #\ )))
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(set! name (string->symbol (car tokens)))
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(set! data (string->nvpairs (list-string-concat (cdr tokens) " ") '()))))
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(define (value->string a)
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(cond
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((number? a) (string-append "n:" (number->string a)))
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((string? a) (string-append "s:" a))
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((vector? a) (string-append "v:" (number->string (vector-ref a 0)) ","
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(number->string (vector-ref a 1)) ","
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(number->string (vector-ref a 2))))
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((symbol? a) (string-append "y:" (symbol->string a)))
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(else (error "unsupported arg type for " a))))
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(define (nvpairs->string l s)
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(cond
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((null? l) s)
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(else
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(nvpairs->string (cdr l) (string-append s (symbol->string (caar l)) "="
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(value->string (cadr (car l))) " ")))))
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(define (string->value a)
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(cond
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((string=? (car a) "n") (string->number (cadr a)))
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((string=? (car a) "s") (cadr a))
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((string=? (car a) "v")
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(let ((v (string-split (cadr a) #\,)))
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(vector (string->number (list-ref v 0))
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(string->number (list-ref v 1))
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(string->number (list-ref v 2)))))
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((string=? (car a) "y") (string->symbol (cadr a)))
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(else (error "unsupported value type for " a))))
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(define (string->nvpairs s l)
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(map
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(lambda (pair)
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(let ((nv (string-split pair #\=)))
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(list (string->symbol (car nv))
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(string->value (string-split (cadr nv) #\:)))))
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(string-split s #\ )))
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(super-new))
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