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March 18, 2021 17:51
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#lang racket/base | |
(require racket/string racket/bytes racket/vector racket/port) | |
(define h (make-hash)) | |
;(#%declare #:unsafe) | |
(define (split-lines/bytes) | |
(for* ([l (in-bytes-lines)]) | |
(let loop ([i 0] [last 0]) | |
(cond [(= i (bytes-length l)) | |
(unless (eq? i last) | |
(hash-update! h (bytes-downcase! (subbytes l last i)) add1 0))] | |
[(eq? (bytes-ref l i) (char->integer #\space)) | |
(unless (eq? i last) | |
(hash-update! h (bytes-downcase! (subbytes l last i)) add1 0)) | |
(loop (add1 i) (add1 i))] | |
[else | |
(loop (add1 i) last)])))) | |
(define (bytes-downcase! b) | |
(for ([(n i) (in-indexed (in-bytes b))]) | |
(when (<= (char->integer #\A) n (char->integer #\Z)) | |
(bytes-set! b i (- n (- (char->integer #\A) (char->integer #\a)))))) | |
b) | |
(define (string-downcase! b) | |
(for ([(n i) (in-indexed (in-string b))]) | |
(when (char<=? (values #\A) n (values #\Z)) | |
(string-set! b i (integer->char (- (char->integer n) (- (char->integer #\A) (char->integer #\a))))))) | |
b) | |
(define (split-lines/string) | |
(for* ([l (in-lines)]) | |
(let loop ([i 0] [last 0]) | |
(cond [(= i (string-length l)) | |
(unless (eq? i last) | |
(hash-update! h (string-downcase (substring l last i)) add1 0))] | |
[(or (eq? (string-ref l i) #\space) | |
(eq? (string-ref l i) #\tab)) | |
(unless (eq? i last) | |
(hash-update! h (string-downcase (substring l last i)) add1 0)) | |
(loop (add1 i) (add1 i))] | |
[else | |
(loop (add1 i) last)])))) | |
(define (split-chunks/string) | |
(for* ([l (in-producer (lambda () (read-string 64000)) eof)]) | |
(let loop ([i 0] [last 0]) | |
(cond [(= i (string-length l)) | |
(unless (eq? i last) | |
(hash-update! h (string-downcase (substring l last i)) add1 0))] | |
[(or (eq? (string-ref l i) #\space) | |
(eq? (string-ref l i) #\newline) | |
(eq? (string-ref l i) #\tab)) | |
(unless (eq? i last) | |
(hash-update! h (string-downcase (substring l last i)) add1 0)) | |
(loop (add1 i) (add1 i))] | |
[else | |
(loop (add1 i) last)])))) | |
(define (split-chunks/bytes) | |
(for* ([l (in-producer (lambda () (read-bytes 64000)) eof)]) | |
(let loop ([i 0] [last 0]) | |
(cond [(= i (bytes-length l)) | |
(unless (eq? i last) | |
(hash-update! h (bytes-downcase! (subbytes l last i)) add1 0))] | |
[(or (eq? (bytes-ref l i) (char->integer #\space)) | |
(eq? (bytes-ref l i) (char->integer #\newline)) | |
(eq? (bytes-ref l i) (char->integer #\tab))) | |
(unless (eq? i last) | |
(hash-update! h (bytes-downcase! (subbytes l last i)) add1 0)) | |
(loop (add1 i) (add1 i))] | |
[else | |
(loop (add1 i) last)])))) | |
(define (split-port-regexp) | |
(let loop () | |
(define word (regexp-match #px"[^\\s\n]+" (current-input-port))) | |
(when word | |
(define w* (string-downcase (bytes->string/utf-8 (car word)))) | |
(hash-update! h w* add1 0) | |
(loop)))) | |
(time (split-lines/string)) | |
(define v | |
(time | |
(for/vector #:length (hash-count h) | |
([(k v) (in-hash h)]) | |
(cons k v)))) | |
(time (vector-sort! v > #:key cdr)) | |
(define p (current-output-port) #; (open-output-nowhere)) | |
(time | |
(for ([pair (in-vector v)]) | |
(display (car pair) p) (write-bytes #" " p) | |
(write (cdr pair) p) | |
(newline p))) | |
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