65 lines
1.8 KiB
Scheme
65 lines
1.8 KiB
Scheme
(module reader (read-from-file
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read-raw-forms)
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(import
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scheme
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(chicken base)
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(chicken io)
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(chicken pathname)
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(chicken port)
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(chicken read-syntax)
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(chicken string)
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(chicken syntax)
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brev-separate
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fmt)
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(import-syntax utils)
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(define (read-forms acc)
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(let ((r (read-with-source-info (current-input-port))))
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(if (eof-object? r) (reverse acc)
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(read-forms (cons r acc)))))
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(define (read-from-file file)
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(with-directory file
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(with-input-from-file (pathname-strip-directory file)
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(fn (read-forms (list))))))
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(define (read-bracket port)
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(let loop ((c (read-char port))
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(str (string)))
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(cond ((char=? c #\])
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(cons '¤
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(with-input-from-string str
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(fn (port-map identity read)))))
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((char=? c #\[)
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(loop port (conc )))
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(else
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(loop (read-char port)
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(conc str c))))))
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(define open-bracket-counter (make-parameter 0))
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(define (read-raw-forms input-source)
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(let ((bracket-end (gensym)))
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(set-read-syntax!
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#\]
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(lambda (port)
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(when (= 0 (open-bracket-counter))
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(error "Unmatched closing bracket"))
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(open-bracket-counter (- (open-bracket-counter) 1))
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bracket-end))
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(set-read-syntax!
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#\[
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(lambda (port)
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(open-bracket-counter (+ (open-bracket-counter) 1))
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(let loop ((r (read port))
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(acc (list)))
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(if (eq? r bracket-end)
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(cons '¤ (reverse acc))
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(loop (read port)
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(cons r acc)))))))
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(if (eq? input-source 'stdin)
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(read-forms (list))
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(read-from-file input-source))))
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