mirror of
https://github.com/ashinn/chibi-scheme.git
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8b5eb68238
They can be close()d explicitly with close-file-descriptor, and will close() on gc, but only explicitly closing the last port on them will close the fileno. Notably needed for network sockets where we open separate input and output ports on the same socket.
60 lines
1.9 KiB
Scheme
60 lines
1.9 KiB
Scheme
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;; let-optionals* is in the core
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(define-syntax let*-to-let
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(syntax-rules ()
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((let*-to-let letstar ls (vars ...) ((v . d) . rest) . body)
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(let*-to-let letstar ls (vars ... (v tmp . d)) rest . body))
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((let*-to-let letstar ls ((var tmp . d) ...) rest . body)
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(letstar ls ((tmp . d) ... . rest)
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(let ((var tmp) ...) . body)))))
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(define-syntax let-optionals
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(syntax-rules ()
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((let-optionals ls vars . body)
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(let*-to-let let-optionals* ls () vars . body))))
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(define-syntax opt-lambda
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(syntax-rules ()
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((opt-lambda vars . body)
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(lambda args (let-optionals args vars . body)))))
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(define (keyword-ref ls key . o)
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(cond ((memq key ls) => cadr)
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(else (and (pair? o) (car o)))))
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(define-syntax keyword-ref*
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(syntax-rules ()
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((keyword-ref* ls key default)
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(cond ((memq key ls) => cadr) (else default)))))
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(define (symbol->keyword sym)
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(string->symbol (string-append (symbol->string sym) ":")))
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(define-syntax symbol->keyword*
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(syntax-rules ()
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((symbol->keyword* sym)
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(string->symbol (string-append (symbol->string sym) ":")))))
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(define-syntax let-keywords*
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(syntax-rules ()
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((let-keywords* opt-ls () . body)
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(begin . body))
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((let-keywords* (op . args) vars . body)
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(let ((tmp (op . args)))
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(let-keywords* tmp vars . body)))
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((let-keywords* opt-ls ((var) . rest) . body)
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(let-keywords* opt-ls ((var #f) . rest) . body))
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((let-keywords* opt-ls ((var default) . rest) . body)
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(let ((var (keyword-ref* opt-ls (symbol->keyword* 'var) default)))
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(let-keywords* opt-ls rest . body)))
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((let-keywords* opt-ls ((var key default) . rest) . body)
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(let ((var (keyword-ref* opt-ls 'key default)))
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(let-keywords* opt-ls rest . body)))
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((let-keywords* opt-ls tail . body)
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(let ((tail opt-ls)) . body))))
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(define-syntax let-keywords
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(syntax-rules ()
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((let-keywords ls vars . body)
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(let*-to-let let-keywords* ls () vars . body))))
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