annoformat/annoformat.rkt at master · lstyrtmrnbd/annoformat · GitHub

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#lang racket

(require sxml)
(require srfi/13)

(define test-file "test.annotations.xml")

(define (get-sxml filename)
  (ssax:xml->sxml (open-input-file filename) '()))

(define find-annotations
  (sxpath "/document/annotations/annotation"))

(define (first-log-data xml)
  (if (not (null? (find-annotations xml)))
      (sxml:attr (car (find-annotations xml))
                 'log_data)
      ""))

(define url-key "&a-v=")

(define (find-video-url logstr)
  (if (string-contains logstr url-key)
      (let* ((start (+ 5 (string-contains logstr url-key)))
             (end (+ start 11)))
        (string-append "https://youtu.be/" (substring logstr start end)))
      ""))

(define (get-url xml)
  (find-video-url (first-log-data xml)))

(define find-text
  (sxpath "/document/annotations/annotation/TEXT"))

(define (break-text text-list)
  (map (lambda (txt)
         (string-append (sxml:text txt) "\n\n"))
       text-list))

;; testing
(define (print-text text-list)
  (map (lambda (txt)
         (display (string-append (sxml:text txt) "\n\n")))
       text-list))

(define find-time
  (sxpath "/document/annotations/annotation/segment/movingRegion/rectRegion"))

(define (every-other li)
  (let ((c 0))
    (filter (lambda (x)
              (begin
                (set! c (+ c 1))
                (odd? c)))
            li)))

(define (extract-t rect-region)
  (second (fifth (second rect-region))))

(define (break-time xml)
  (map (lambda (rr)
         (string-append (extract-t rr) "\n"))
       (every-other (find-time xml))))

;; zips lists of unequal length
(define (interleave list1 list2)
  (cond ((empty? list1) list2)
        ((empty? list2) list1)
        (else
         (append
          (list (car list1) (car list2))
          (interleave (cdr list1) (cdr list2))))))

;; zips formatted timecodes and text
(define (combine-time-text xml)
  (interleave (break-time xml)
              (break-text (find-text xml))))

(define (display-time-text ttl out)
  (map (lambda (tt)
         (display tt out))
       ttl))

;;; I/O

(define input-dir (build-path (find-system-path 'orig-dir)
                              "CIR Annotations\\"))

(define output-dir "CIR Annotations Reformatted\\")

(define (in-out in-path out-path)
  (call-with-input-file in-path
    (lambda (input)
      (call-with-output-file out-path
        (lambda (output)
          (let ((sxml (ssax:xml->sxml input '())))
            (begin
              (display (string-append (get-url sxml) "\n\n")
                       output)
              (display-time-text (combine-time-text sxml)
                                 output))))
        #:mode 'text
        #:exists 'replace))
    #:mode 'text))

;; takes input path and generates output path
(define (transform-path in-path)
  (let-values ([(base filename drop) (split-path in-path)])
    (let-values ([(parent olddir drop) (split-path base)])
      (build-path parent output-dir (path-replace-extension filename ".txt")))))

(define (do-files directory proc)
  (map proc
       (directory-list directory
                       #:build? #t)))

(define (reformat-all)
  (do-files input-dir
            (lambda (in-path)
              (in-out in-path (transform-path in-path)))))

;;; Some tests on general annotation structure

(define (text-count in-file)
  (length (find-text (ssax:xml->sxml in-file '()))))

(define (time-count in-file)
  (length (find-time (ssax:xml->sxml in-file '()))))

(define (text-per-timestamp xml)
  (= (length (find-text xml))
     (* 2 (length (find-time xml)))))

(define (count-text-per-timestamp in-file)
  (text-per-timestamp (ssax:xml->sxml in-file '())))