47 lines
1.5 KiB
Scheme
47 lines
1.5 KiB
Scheme
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#lang scheme
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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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(define ser (nvpairs->string (list
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(list 'one 2)
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(list 'two "three")
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(list 'three (vector 1 2 3))
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(list 'four 'hello)) ""))
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(string->nvpairs ser '())
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