ikarus/scheme/unicode/unicode-data.ss

74 lines
2.0 KiB
Scheme
Executable File

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