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tabber: an ellipsis as the second thing on a line now tabs as if the ellipsis wasn't there; good for plt redex

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svn: r5553

original commit: bdc4f19985503f80164abd2d485dab9c46af71f8
This commit is contained in:
Robby Findler 2007-02-05 19:25:25 +00:00
parent bc3ee684bc
commit 9d1a810f9b
1 changed files with 28 additions and 8 deletions
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36
collects/framework/private/scheme.ss
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@ -518,7 +518,7 @@
;; Something went wrong matching. Should we get here?
(do-indent 0)]
[(not last)
;; We can't find a match backward from pos,
;; We can't find a match backward from pos,
;; but we seem to be inside an S-exp, so
;; go "up" an S-exp, and move forward past
;; the associated paren
@ -527,28 +527,32 @@
(+ (visual-offset enclosing) 1)
0)))]
[(= contains last)
;; There's only one S-expr in the S-expr
;; There's only one S-expr in the S-expr
;; containing "pos"
(do-indent (+ (visual-offset contains)
(procedure-indent)))]
[(special-check)
;; In case of "define", etc., ignore the position of last
;; In case of "define", etc., ignore the position of last
;; and just indent under the "define"
(do-indent (add1 (visual-offset contains)))]
[(= contain-para last-para)
;; So far, the S-exp containing "pos" was all on
;; one line (possibly not counting the opening paren),
;; so indent to follow the first S-exp's end
;; unless there are just two sexps and the second is an ellipsis.
;; in that case, we just ignore the ellipsis
(let ([name-length (let ([id-end (get-forward-sexp contains)])
(if id-end
(- id-end contains)
0))])
(do-indent (+ (visual-offset contains)
name-length
(indent-first-arg (+ contains
name-length)))))]
(if (second-sexp-is-ellipsis? contains)
(do-indent (visual-offset contains))
(do-indent (+ (visual-offset contains)
name-length
(indent-first-arg (+ contains
name-length))))))]
[else
;; No particular special case, so indent to match first
;; No particular special case, so indent to match first
;; S-expr that start on the previous line
(let loop ([last last][last-para last-para])
(let* ([next-to-last (backward-match last limit)]
@ -558,6 +562,22 @@
(loop next-to-last next-to-last-para)
(do-indent (visual-offset last)))))])))))
;; returns #t if `contains' is at a position on a line with an sexp, an ellipsis and nothing else.
;; otherwise, returns #f
(define/private (second-sexp-is-ellipsis? contains)
(let ([fst-end (get-forward-sexp contains)])
(and fst-end
(let ([snd-end (get-forward-sexp fst-end)])
(and snd-end
(let ([snd-start (get-backward-sexp snd-end)])
(and snd-start
(equal? (get-text snd-start snd-end)
"...")
(let ([thrd-start (get-forward-sexp snd-end)])
(and (or (not thrd-start)
(not (= (position-paragraph thrd-start)
(position-paragraph snd-start)))))))))))))
(define/public tabify-selection
(opt-lambda ([start-pos (get-start-position)]
[end-pos (get-end-position)])