gui/gui-lib/scribble/private/indentation.rkt
2015-06-03 18:00:54 -05:00

726 lines
34 KiB
Racket

#lang racket/base
(require racket/class
racket/gui/base
framework)
(define surrogate%
(class (racket:text-mode-mixin
(color:text-mode-mixin
mode:surrogate-text%))
(define/override (on-enable-surrogate txt)
(send (send txt get-keymap) chain-to-keymap at-exp-keymap #f)
(super on-enable-surrogate txt))
(define/override (on-disable-surrogate txt)
(keymap:remove-chained-keymap txt at-exp-keymap)
(super on-disable-surrogate txt))
(super-new)))
(define at-exp-keymap (new keymap:aug-keymap%))
(define (reindent-paragraph t evt)
(unless (send t is-stopped?)
(define sp (send t get-start-position))
(when (= sp (send t get-end-position))
(paragraph-indentation t sp 60))))
(send at-exp-keymap add-function "reindent-paragraph" reindent-paragraph)
(send at-exp-keymap map-function "esc;q" "reindent-paragraph")
(send at-exp-keymap map-function "?:a:q" "reindent-paragraph")
;;(paragraph-indentation a-racket:text posi width) → void?
;; posi : exact-integer? = current given position
;; width : exact-integer? = user defined line width limitation
;; Indent a whole paragraph(multiple lines that contains the given position
(define (paragraph-indentation txt posi width)
(let* ([current-line (send txt position-paragraph posi)]
[guess-start-posi (send txt find-up-sexp posi)])
(if guess-start-posi ;;inside a parenthesis
(let* ([guess-start-line (send txt position-paragraph guess-start-posi)])
(paragraph-indent-start txt guess-start-line current-line width))
(paragraph-indent-start txt current-line current-line width))));;handle text, no boundry guess
;;(paragraph-indent-start a-racket:text guess-start current-line) → void?
;; guess-start : exact-integer? = (send text find-up-sexp posi)
;; current-line : exact-integer? = current line number
;; Indent a whole paragraph starts with empty line or guess-start, end with empty line
(define (paragraph-indent-start text guess-start current-line width)
(define para-start-line (for/first ([line (in-range guess-start 0 -1)]
#:when (empty-line? text line))
line))
(when para-start-line
(send text begin-edit-sequence)
(let loop ([i (+ para-start-line 1)])
(unless (and (empty-line? text i) (> i current-line))
(define posi (send text paragraph-start-position i))
(define amount (determine-spaces text posi))
(when amount
(adjust-spaces text i amount posi))
(adjust-para-width text posi width)
(loop (+ i 1))))
(send text end-edit-sequence)))
;;(empty-line? a-racket:text line) → boolean?
;; line : exact-integer? = current line number
(define (empty-line? txt line)
(let* ([line-start (send txt paragraph-start-position line)]
[line-end (send txt paragraph-end-position line)]
[line-classify (txt-position-classify txt line-start line-end)])
(not (para-not-empty? line-classify))))
;;(rest-empty? a-racket:text line start) → boolean?
;; line : exact-integer? = (send text position-paragraph start)
;; start : exact-intefer? = the start position
(define (rest-empty? txt line start)
(let* ([line-start (add1 start)]
[line-end (send txt paragraph-end-position line)]
[line-classify (txt-position-classify txt line-start line-end)])
(not (para-not-empty? line-classify))))
;;(determine-spaces : a-racket:text position) → exact-integer?/boolean?
;; position : exact-integer? = current position
;; Return exact integer represents number of #\space to put in front of current paragraph(line) or #f
(define (determine-spaces txt posi)
(define current-para (send txt position-paragraph posi))
(define para-start (send txt paragraph-start-position current-para))
(define para-start-skip-space (start-skip-spaces txt current-para 'forward))
(cond
[para-start-skip-space
(define char-classify (send txt classify-position para-start-skip-space))
(define prev-posi (send txt find-up-sexp para-start-skip-space))
(cond
[prev-posi
(define this-para (send txt position-paragraph prev-posi))
(cond
[(equal? #\[ (send txt get-character prev-posi))
(define this-para-start (send txt paragraph-start-position this-para))
(if (= current-para this-para)
0
(if (rest-empty? txt this-para prev-posi)
1
(add1 (- prev-posi this-para-start))))]
;;if it is inside a racket function and not the first line of the racket function
[(equal? #\( (send txt get-character prev-posi)) #f]
[else
(define curleys (number-of-curley-braces-if-there-are-only-curley-braces txt current-para))
(if curleys
(max 0 (- (count-parens txt prev-posi) curleys))
(count-parens txt prev-posi))])]
[(equal? 'text char-classify) 0]
[else #f])]
[else #f]))
(define (number-of-curley-braces-if-there-are-only-curley-braces txt para)
(define number-of-curley-braces 0)
(define line-contains-only-curley-braces?
(for/and ([p (in-range (send txt paragraph-start-position para)
(send txt paragraph-end-position para))])
(define c (send txt get-character p))
(cond
[(char-whitespace? c) #t]
[(equal? c #\})
(set! number-of-curley-braces (+ number-of-curley-braces 1))
#t]
[else #f])))
(and line-contains-only-curley-braces?
number-of-curley-braces))
;;(adjust-para-width a-racket:text position width) → boolean?
;; position : exact-integer? = current position
;; width : exact-integer? = predefined value
;;Modify the given paragraph(line) if it exceed width limit by inserting #\newline to proper position
(define (adjust-para-width txt posi width)
(let* ([para-num (send txt position-paragraph posi)]
[para-start (send txt paragraph-start-position para-num)]
[para-end (send txt paragraph-end-position para-num)]
[para-len (add1 (- para-end para-start))]
[para-classify (txt-position-classify txt para-start para-end)])
(if (para-not-empty? para-classify) ;continue when current paragraph is not empty
(cond ((> para-len width) ;paragraph too long
(define new-line-created (select-cut-option txt para-start para-len width para-classify))
(when (equal? new-line-created #t)
(let* ([next-para-num (+ para-num 2)]
[next-para-start (send txt paragraph-start-position next-para-num)]
[next-para-end (send txt paragraph-end-position next-para-num)]
[next-para-classify (txt-position-classify txt next-para-start next-para-end)])
(if (para-not-empty? next-para-classify) ;; next paragraph not empty
(begin (delete-end-spaces txt (+ para-num 1))
(delete-start-spaces txt (+ para-num 2))
(let* ([nxt-para-num (+ para-num 2)]
[nxt-para-start (send txt paragraph-start-position nxt-para-num)]
[nxt-para-end (send txt paragraph-end-position nxt-para-num)]
[nxt-para-classify (txt-position-classify txt nxt-para-start nxt-para-end)])
(when (equal? 'text (car nxt-para-classify))
;now text
(send txt delete nxt-para-start 'back)
(send txt insert #\space (sub1 nxt-para-start)))))
#t))))
;;push up the next paragraph if not empty, and it is text
((< para-len width)
(push-back-lines txt para-num para-start width)
(let* ([new-end (send txt paragraph-end-position para-num)]
[new-len (add1 (- new-end para-start))])
(when (> new-len width)
(adjust-para-width txt para-start width))
))
(else #t))
#t)))
;;(txt-position-classify a-racket:text start end) → void?
;; start : exact-integer? = position to start classify
;; end : exact-integer? = position to end classify
;; Basic position classify method that classify text within certain range
(define (txt-position-classify txt start end)
(for/list ([x (in-range start end 1)])
(send txt classify-position x)))
;;(is-at-sign? a-racket:text posi) → boolean?
;; posi : exact-integer? = a position in the text
;; Check if the given position is an @
(define (is-at-sign? txt posi)
(and (equal? (send txt classify-position posi) 'parenthesis)
(let-values ([(start end) (send txt get-token-range posi)])
(and (equal? start posi)
(equal? end (+ posi 1))))
(equal? #\@ (send txt get-character posi))))
;;(para-not-empty? a-racket:text classify-lst) → boolean?
;; classify-lst : list? = (txt-position-classify text start end)
;; Check if current paragraph(line) is empty, we consider comment line as empty line
(define (para-not-empty? classify-lst) ;;we consider 'other and 'comment as empty
(if (or (member 'parenthesis classify-lst)
(member 'string classify-lst)
(member 'symbol classify-lst)
(member 'text classify-lst))
#t
#f))
;;(start-skip-spaces a-racket:text para direction) → exact-integer?
;;para : exact-integer? = paragraph(line) number
;;direction : symbol? = 'forward/'backward
;;Return the first non-empty(#\space #\tab) character's position in given paragraph(line)
(define (start-skip-spaces txt para direction)
(let* ([para-start (send txt paragraph-start-position para)]
[para-end (send txt paragraph-end-position para)])
(if (equal? direction 'forward)
(for/first ([start-skip-space (in-range para-start para-end 1)]
#:when (not (member (send txt get-character start-skip-space) (list #\space #\tab))))
start-skip-space)
(for/first ([start-skip-space (in-range (sub1 para-end) para-start -1)];;ignore the newline
#:when (not (member (send txt get-character start-skip-space) (list #\space #\tab))))
start-skip-space))))
;;(delete-end-spaces a-racket:text para) → void?
;;para : exact-integer? = paragraph(line) number
;;Delete all #\space and #\tab at the end of given paragraph
(define (delete-end-spaces txt para)
(let* ([para-end (send txt paragraph-end-position para)]
[last-non-white (start-skip-spaces txt para 'backward)])
(if last-non-white
(send txt delete (+ last-non-white 1) para-end)
#f)))
;;(delete-start-spaces a-racket:text para) → void?
;;para : exact-integer? = paragraph(line) number
;;Delete all #\space and #\tab at the beginning of given paragraph
(define (delete-start-spaces txt para)
(let* ([para-start (send txt paragraph-start-position para)]
[first-non-white (start-skip-spaces txt para 'forward)])
(when (and first-non-white (> first-non-white para-start))
(send txt delete para-start first-non-white))))
;;(count-parens a-racket:text posi) → exact-integer?
;;posi : exact-integer? = a position in given text
;;Return number of parenthesis till the outmost @ annotation,
;;if the there is "[", we check if it has "@" after at the same
;;line, if so, we add the number of characters between "[" and
;;the beginning of the line it appears
(define (count-parens txt posi)
(define count 0)
(do ([p posi (send txt find-up-sexp p)]);backward-containing-sexp p 0)])
((not p) count)
(cond [(equal? #\{ (send txt get-character p)) (set! count (add1 count))]
[(equal? #\[ (send txt get-character p))
(let* ([this-para (send txt position-paragraph p)]
[this-para-start (send txt paragraph-start-position this-para)])
(if (rest-empty? txt this-para p)
(set! count (add1 count))
(set! count (+ (add1 (- p this-para-start)) count))))]
[else #t])))
;;(push-back-check? a-racket:text posi) → Boolean?
;;posi : exact-integer? = a position in given text which is the @'s position
;;Return #f if we see:
;; 1) "[" with muptiple lines after
;; 2) keyworld "codeblock" or "verbatim"
;; otherwise return #t
(define (push-back-check? t posi)
(define key-words (list "codeblock" "verbatim"))
(if (is-at-sign? t posi)
(let* ([first-char-posi (add1 posi)]
[open-paren-posi (send t get-forward-sexp first-char-posi)]);start from the first char after @
(cond
[(equal? #\[ (send t get-character open-paren-posi))
(let* ([close-paren-posi-plus-one (send t get-forward-sexp open-paren-posi)]
[start-line (send t position-paragraph open-paren-posi)])
(if close-paren-posi-plus-one
(let* ([close-paren-posi (sub1 close-paren-posi-plus-one)]
[end-line (send t position-paragraph close-paren-posi)])
(equal? start-line end-line))
#f))]
[(equal? #\{ (send t get-character open-paren-posi))
(define key-word (send t get-text first-char-posi open-paren-posi))
(if (member key-word key-words)
#f
#t)]
[else #f]))
#t)) ;; e.g @verbatim|{}|
;;(push-back-line a-racket:text para width) → void?
;;para : exact-integer? = paragraph(line) number
;;para-start : exact-integer? = start position of given paragraph(line)
;;width : exact-intefer? = predefined paragrah width
(define (push-back-lines txt para para-start width)
(let* ([para-end (send txt paragraph-end-position para)]
[new-width (add1 (- para-end para-start))];;init with original line length
[nxt-para (add1 para)]
[nxt-para-end (send txt paragraph-end-position nxt-para)])
(if (or (equal? para-end nxt-para-end) (equal? para-end (sub1 nxt-para-end))) ;;reach/exceed the last line
#t;;all done
(let ([nxt-para-start (start-skip-spaces txt nxt-para 'forward)])
(when nxt-para-start ;next line empty, start-skip-spaces returns #f
(define nxt-para-classify
(and nxt-para-start (txt-position-classify txt nxt-para-start nxt-para-end)))
(if (and (para-not-empty? nxt-para-classify) (push-back-check? txt nxt-para-start)
(equal? (send txt classify-position (sub1 para-end)) 'text);;previous line end with text
(< new-width width))
;;we only push back those lines satisfy push-back-check rules
(begin (delete-end-spaces txt para)
(delete-start-spaces txt nxt-para)
(let ([new-nxt-start (send txt paragraph-start-position nxt-para)])
(send txt delete new-nxt-start 'back)
(send txt insert #\space (sub1 new-nxt-start)))
(push-back-lines txt para para-start width)) ;;keep pushing back lines
#t)))))) ;;done
;;Deprecated
;;(indent-racket-fuc a-racket:text posi) → exact-integer?/boolean?
;;posi : exact-integer? = a position in given text
;;Return 1 if the position is within first #\( of racket function, or #f
(define (indent-racket-func txt posi)
(let* ([prev-posi (sub1 posi)]
[back-one-level (send txt backward-containing-sexp prev-posi 0)])
(if back-one-level
(let ([paren (sub1 back-one-level)])
(cond ((equal? #\{ (send txt get-character paren)) 1)
((equal? #\[ (send txt get-character paren));might be inside cond etc
(let ([back-two-level (send txt backward-containing-sexp (sub1 paren) 0)])
(if back-two-level
#f
1)))
(else #f)))
#f)));;#f needs to be replaced by racket indentation function
;;(select-cut-option a-racket:text start len width classify-lst) → boolean?
;; start : exact-integer? = (send text paragraph-start-position given-paragraph-number)
;; len : exact-integer? = length of current paragraph(line)
;; width : exact-integer? = predefined value
;; classify-lst: list? = (txt-position-classify text start end) here end is the end position
;; of current paragraph(line)
;; Put #\newline to shorten given paragraph if necessary, return #t if #\newline inserted
;; Situations:
;;1) breake whole @... to next line,
;;2) keep @.... in current line
;;3) if it is a simple text, just cut it
(define (select-cut-option txt start len width classify-lst)
(let ([adjust-result (list-ref classify-lst (sub1 width))]);;get the "end" position adjust result
(cond [(equal? adjust-result 'text)
(let ([new-break (insert-break-text txt start (+ start width) (+ start len))])
(if new-break
;replace the #\space with #\newline
(begin (send txt delete (add1 new-break) 'back)
(send txt insert #\newline new-break)
#t)
#f))]
;;'symbol 'parenthesis 'string or 'space
;;1)went backward to find @
;;2)went forward to find first 'text
[else
(let ([posi (insert-break-func txt start len width classify-lst)])
(if posi
(begin (send txt insert #\newline posi);;directly insert before @ or 'text
#t)
#f))])))
;;(insert-break-text a-racket:text start width-end end) → exact-integer?/boolean?
;; start : exact-integer? = (send text paragraph-start-position given-paragraph-number)
;; width-end : exact-integer? = (+ start width) here width is the user defined line width limit
;; end : exact-integer? = (send text paragraph-end-position given-paragraph-number)
;;Return the proper position to insert #\newline into given text line, #f if not found
(define (insert-break-text text start width-end end)
(for/first ([break-ls (in-range width-end start -1)]
#:when (equal? #\space (send text get-character break-ls)))
break-ls))
;;(insert-break-func a-racket:text start len width classify-lst) → exact-integer?/boolean?
;; start : exact-integer? = (send text paragraph-start-position given-paragraph-number)
;; len : exact-integer? = length of current paragraph(line)
;; width : exact-integer? = predefined value
;; classify-lst: list? = (txt-position-classify text start end) here end is the end position
;; of current paragraph(line)
;;Return the proper position to insert #\newline into given line, #f if not found
(define (insert-break-func text start len width classify-lst)
(let ([at-sign-posi
(for/first ([sign-posi (in-range (+ start width) start -1)]
#:when (is-at-sign? text sign-posi))
sign-posi)])
(if (and at-sign-posi
(not (equal? 'white-space (list-ref classify-lst (sub1 (- at-sign-posi start))))))
at-sign-posi
(for/first ([posi (in-range width (- len 1))]
#:when (equal? 'text (list-ref classify-lst posi)))
posi))))
;;adjust-spaces for text
;;(adjust-spaces : a-racket:text para amount posi) → boolean?
;; para : exact-integer? = given paragraph(line) number
;; amount : exact-integer? = (determine-spaces text posi)
;; posi : exact-integer? = a position in the text
;; Delete #\spaces and #\tab in front of given paragraph(line) if not
;; equal to the amount given by determine-spaces. Then insert new amount of #\space
;; in front of the paragraph(line)
(define (adjust-spaces text para amount posi)
(define posi-skip-space (start-skip-spaces text para 'forward))
(when posi-skip-space
(define origin-amount (- posi-skip-space posi))
(when (and amount (not (= origin-amount amount)))
(send text delete posi posi-skip-space)
(when (> amount 0)
(send text insert (make-string amount #\space) posi))))
#t)
;;test cases
(module+ test
(require rackunit framework)
;test start-skip-spaces
(check-equal? (let ([t (new racket:text%)])
(send t insert "test1 test2\n @test3\n")
(start-skip-spaces t 1 'forward)) 13)
(check-equal? (let ([t (new racket:text%)])
(send t insert "{abcd\n@efgh\n}")
(start-skip-spaces t 1 'forward)) 6)
(check-equal? (let ([t (new racket:text%)])
(send t insert "{abcd\n efgh\n}")
(start-skip-spaces t 1 'forward)) 8)
(check-equal? (let ([t (new racket:text%)])
(send t insert "{abc\n \n}")
(start-skip-spaces t 1 'forward)) #f)
(check-equal? (let ([t (new racket:text%)])
(send t insert "{abc\nefgh \n}")
(start-skip-spaces t 1 'backward)) 8)
(check-equal? (let ([t (new racket:text%)])
(send t insert "{abcd\n\t\tefgh\n}");tab
(start-skip-spaces t 1 'forward)) 8)
(define txt_1 (new racket:text%))
(send txt_1 insert "#lang scribble/base\n@f{x}\n@;ghj\ntyty\n\n")
;test para-not-empty?
(check-equal? (let ([result (txt-position-classify txt_1 0 5)])
(para-not-empty? result))
#f);;consider 'other as empty line
(check-equal? (let ([result (txt-position-classify txt_1 20 24)])
(para-not-empty? result))
#t)
(check-equal? (let ([result (txt-position-classify txt_1 27 31)])
(para-not-empty? result))
#f);comment
(check-equal? (let ([result (txt-position-classify txt_1 37 38)])
(para-not-empty? result))
#f);empty line
;test is-at-sign
(check-equal? (let ([t (new racket:text%)])
(send t insert "(x)")
(is-at-sign? t 0))
#f)
(check-equal? (is-at-sign? txt_1 20) #t)
(check-equal? (is-at-sign? txt_1 22) #f)
;test determine-spaces
(check-equal? (determine-spaces txt_1 15) #f)
(check-equal? (determine-spaces txt_1 21) #f)
(define txt_2 (new racket:text%))
(send txt_2 insert "#lang scribble/base\n@f{\n @a\n@b\n}")
(check-equal? (determine-spaces txt_2 25) 1)
(check-equal? (determine-spaces txt_2 28) 1)
(define txt_3 (new racket:text%))
(send txt_3 insert "#lang scribble/base\n@f[@x\n@y\n]")
(check-equal? (determine-spaces txt_3 24) #f)
(check-equal? (determine-spaces txt_3 27) 3)
(define txt_4 (new racket:text%))
(send txt_4 insert "#lang scribble/base\n@itemlist[@item{item1}\n@item{item2}\n]")
(check-equal? (determine-spaces txt_4 22) #f)
(check-equal? (determine-spaces txt_4 44) 10)
(define txt_5 (new racket:text%))
(send txt_5 insert "#lang scribble/base\n@boldlist{@me{item1}\n@me{item2}\n}")
(check-equal? (determine-spaces txt_5 31) #f)
(check-equal? (determine-spaces txt_5 46) 1)
(define txt_6 (new racket:text%))
(send txt_6 insert "@list{@me{item1}\n\n@me{item2}\n}")
(check-equal? (determine-spaces txt_6 16) #f)
(check-equal? (determine-spaces txt_6 17) #f);empty line!
(check-equal? (determine-spaces txt_6 18) 1)
(check-equal? (let ([txt_7 (new racket:text%)])
(send txt_7 insert "@(define (foo . a)\n(bar b))")
(determine-spaces txt_7 19)) #f)
(define txt_8 (new racket:text%))
(send txt_8 insert "@a{me}\n@b[\n@c{@d{e} f\ng\nh}\n")
(check-equal? (count-parens txt_8 22) 2)
(check-equal? (count-parens txt_8 13) 2);;include current parenthesis
(check-equal? (determine-spaces txt_8 22) 2)
(check-equal? (determine-spaces txt_8 12) 1)
(define txt_9 (new racket:text%))
(send txt_9 insert "@a[\n(b c)\n(d\n[(e) f]\n[g h])\n]\n")
(check-equal? (indent-racket-func txt_9 4) 1)
(check-equal? (indent-racket-func txt_9 6) #f)
(check-equal? (determine-spaces txt_9 13) #f)
(check-equal? (determine-spaces txt_9 4) 1)
;;two test cases for count-parens
(check-equal? (let ([t (new racket:text%)])
(send t insert "@a[@b{c d\ne f g}\n@h{i j}]")
(count-parens t 5)) 4)
(check-equal? (let ([t (new racket:text%)])
(send t insert "@a[@b{\n@c{d e f}\ng}]")
(count-parens t 9)) 5)
(check-equal? (let ([t (new racket:text%)])
(send t insert "(d f\n(l [()\n(f ([a (b c)])\n(d e)))])")
(indent-racket-func t 12)) #f)
(check-equal? (let ([t (new racket:text%)])
(send t insert "@a[\n ]\n")
(determine-spaces t 4))
1)
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n\ntest1\n test2\n")
(determine-spaces t 28))
0)
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n\ntestcase @a{b\n\n\n\n\n c}\n\n")
(determine-spaces t 39))
1)
;;test cases for:delete-end-spaces delete-start-spaces
(check-equal? (let ([t (new racket:text%)])
(send t insert "{abcde \nfgh\n}")
(delete-end-spaces t 0)
(send t get-text)) "{abcde\nfgh\n}")
(check-equal? (let ([t (new racket:text%)])
(send t insert "{abcde\t\t\t\t\nfgh\n}")
(delete-end-spaces t 0)
(send t get-text)) "{abcde\nfgh\n}")
(check-equal? (let ([t (new racket:text%)])
(send t insert "{abcde \n\n3\n}")
(delete-end-spaces t 0)
(send t get-text)) "{abcde\n\n3\n}")
(check-equal? (let ([t (new racket:text%)])
(send t insert " {abcde\nfgh\n}")
(delete-start-spaces t 0)
(send t get-text)) "{abcde\nfgh\n}")
(check-equal? (let ([t (new racket:text%)])
(send t insert "@a[\n ]\n")
(delete-start-spaces t 1)
(send t get-text)) "@a[\n]\n")
;;adjust-spaces
(check-equal? (let ([t (new racket:text%)])
(send t insert "@a[\n ]\n")
(adjust-spaces t 1 1 4)
(adjust-spaces t 1 1 4)
(send t get-text)) "@a[\n ]\n")
;;push-back-check?
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n@test[@a{}]\n")
(push-back-check? t 20))
#t)
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n@test[@a{}\n@b{}]\n")
(push-back-check? t 20))
#f)
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n @test{}\n@test{}\n")
(push-back-check? t 21))
#t)
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n@codeblockfake{}\n")
(push-back-check? t 20))
#t)
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n\n@codeblock{}\n")
(push-back-check? t 21))
#f)
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n@verbatim{}\n")
(push-back-check? t 20))
#f)
;;push-back-lines
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\ntest1\n test2\n @test3\n")
(push-back-lines t 1 20 22)
(send t get-text))
"#lang scribble/base\ntest1 test2\n @test3\n")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\ntest1\n test2\n\t\ttest3\n")
(push-back-lines t 1 20 12)
(send t get-text))
"#lang scribble/base\ntest1 test2\n\t\ttest3\n")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\ntest1\n test2\n\t\ttest3\ntest4\n")
(push-back-lines t 1 20 18)
(send t get-text))
"#lang scribble/base\ntest1 test2 test3\ntest4\n")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\ntest1\n test2\n\t\ttest3\n")
(push-back-lines t 1 20 22)
(send t get-text))
"#lang scribble/base\ntest1 test2 test3\n")
;;paragraph indentation
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n\naaa bbb ccc\n @ddd[eee] fff\n ggg hhh iii jjj\n")
(paragraph-indentation t 23 23)
(send t get-text))
"#lang scribble/base\n\naaa bbb ccc @ddd[eee]\nfff ggg hhh iii jjj\n")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n\n@itemlist[@item{aaa bbb ccc\n eee fff}\n @item{ggg hhh iii\n jjj kkk lll mmm nnn ooo\n ppp qqq\nrrr\nsss ttt uuu vvv}]")
(paragraph-indentation t 38 29)
(send t get-text))
"#lang scribble/base\n\n@itemlist[@item{aaa bbb ccc\n eee fff}\n @item{ggg hhh iii\n jjj kkk lll mmm\n nnn ooo ppp qqq\n rrr sss ttt uuu\n vvv}]")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n\n@itemlist[@item{aaa bbb ccc\n eee fff\n @item{ggg hhh iii\n jjj kkk lll mmm nnn ooo\n ppp qqq\nrrr\nsss ttt uuu vvv}}]")
(paragraph-indentation t 38 29)
(send t get-text))
"#lang scribble/base\n\n@itemlist[@item{aaa bbb ccc\n eee fff @item{ggg\n hhh iii jjj kkk\n lll mmm nnn ooo\n ppp qqq rrr sss\n ttt uuu vvv}}]")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\naaa bbb\n @ccc ddd")
(adjust-para-width t 22 12)
(send t get-text))
"#lang scribble/base\naaa bbb\n @ccc ddd")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n\ntest1\n test2\n\t\ttest3\n")
(paragraph-indentation t 22 6)
(send t get-text))
"#lang scribble/base\n\ntest1\ntest2\ntest3\n")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n\ntest1\n test2\n\t\ttest3\n")
(paragraph-indentation t 22 20)
(send t get-text))
"#lang scribble/base\n\ntest1 test2 test3\n")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n\ntest1\n test2\n\t\ttest3 test4\n")
(paragraph-indentation t 22 20)
(send t get-text))
"#lang scribble/base\n\ntest1 test2 test3\ntest4\n")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n\ntestcase @a{b\n\n\n\n\n c}\n\n")
(paragraph-indentation t 39 14)
(send t get-text))
"#lang scribble/base\n\ntestcase @a{b\n\n\n\n\n c}\n\n")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n@a{b\n } \n")
(determine-spaces t 26))
0)
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\n@a{b\n@{\n}}\n")
(determine-spaces t 30))
0)
;;test case for adjust paragraph width
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\naaa bbb\n @ccc ddd")
(adjust-para-width t 22 12)
(send t get-text))
"#lang scribble/base\naaa bbb\n @ccc ddd")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\naaa bbb\nccc ddd @e[f @g{h}]")
(adjust-para-width t 22 12)
(send t get-text))
"#lang scribble/base\naaa bbb ccc\nddd @e[f @g{h}]")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\naaa bbb ccc ddd @e[f @g{h}]")
(adjust-para-width t 22 12)
(send t get-text))
"#lang scribble/base\naaa bbb ccc\nddd @e[f @g{h}]")
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\na b c d @e[f @g{h}]")
(adjust-para-width t 21 9)
(send t get-text))
"#lang scribble/base\na b c d \n@e[f @g{h}]");;keep the space, does not matter
(check-equal? (let ([t (new racket:text%)])
(send t insert "#lang scribble/base\na b c d @e{}\n f g\n")
(adjust-para-width t 21 9)
(send t get-text))
"#lang scribble/base\na b c d \n@e{} f g\n")
;;test insert-break
(check-equal? (let ((t (new racket:text%)))
(send t insert "aaa bbb ccc ddd")
(let ([new-break (insert-break-text t 0 6 14)])
(send t delete (add1 new-break) 'back)
(send t insert #\newline new-break)
(send t get-text))) "aaa\nbbb ccc ddd");;prefer shorter than the "width limit"
;;for the situation there isn't any #\space on right side
(check-equal? (let ((t (new racket:text%)))
(send t insert "aaaa bbbb")
(let ([new-break (insert-break-text t 0 5 8)])
(send t delete (add1 new-break) 'back)
(send t insert #\newline new-break)
(send t get-text))) "aaaa\nbbbb")
)
(provide determine-spaces adjust-para-width paragraph-indentation
surrogate%)