73 lines
2.0 KiB
Scheme
Executable File
73 lines
2.0 KiB
Scheme
Executable File
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(library (unicode-data)
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(export get-unicode-data)
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(import (ikarus))
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(define (read-line)
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(let f ([ac '()])
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(let ([x (read-char)])
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(cond
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[(eof-object? x)
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(if (null? ac)
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(eof-object)
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(list->string (reverse ac)))]
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[(char=? x #\newline)
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(if (null? ac) (f '()) (list->string (reverse ac)))]
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[else (f (cons x ac))]))))
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(define (find-semi/hash str i n)
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(cond
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[(or (fx= i n) (memv (string-ref str i) '(#\; #\#))) i]
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[else (find-semi/hash str (+ i 1) n)]))
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(define (cleanup str)
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(let ([lo
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(let f ([i 0] [n (string-length str)])
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(cond
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[(= i n) n]
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[(char=? #\space (string-ref str i))
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(f (add1 i) n)]
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[else i]))]
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[hi
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(let f ([i (sub1 (string-length str))])
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(cond
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[(< i 0) i]
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[(char=? #\space (string-ref str i))
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(f (sub1 i))]
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[else i]))])
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(if (> hi lo)
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(substring str lo (+ hi 1))
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"")))
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(define (split str)
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(let f ([i 0] [n (string-length str)])
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(cond
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[(or (= i n) (memv (string-ref str i) '(#\#)))
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'("")]
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[else
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(let ([j (find-semi/hash str i n)])
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(cond
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[(or (= j n) (memv (string-ref str i) '(#\#)))
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(list (cleanup (substring str i j)))]
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[else
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(cons (cleanup (substring str i j))
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(f (+ j 1) n))]))])))
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(define (extract-uni-data)
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(let f ([ls '()])
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(let ([line (read-line)])
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(cond
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[(eof-object? line)
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(reverse ls)]
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[else
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(let ([fields (split line)])
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(if (or (null? fields) (equal? fields '("")))
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(f ls)
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(f (cons fields ls))))]))))
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(define (get-unicode-data filename)
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(with-input-from-file
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filename
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extract-uni-data)))
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