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original commit: dbfde2867a6f93d352680800dd39c144b7ebf00b
This commit is contained in:
Matthew Flatt 2004-01-27 21:18:43 +00:00
parent d1228aad7f
commit 14d56fc9bb
1 changed files with 27 additions and 2 deletions
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29
collects/framework/private/scheme.ss
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@ -424,12 +424,17 @@
[okay (and is-tabbable? (> para 0))]
[end (if okay (paragraph-start-position para) 0)]
[limit (get-limit pos)]
;; "contains" is the start of the initial sub-S-exp
;; in the S-exp that contains "pos". If pos is outside
;; all S-exps, this will be the start of the initial
;; S-exp
[contains
(if okay
(backward-containing-sexp end limit)
#f)]
[contain-para (and contains
(position-paragraph contains))]
;; "last" is the start of the S-exp just before "pos"
[last
(if contains
(backward-match end limit)
@ -510,18 +515,30 @@
(void)]
[(= para 0) (do-indent 0)]
[(not contains)
;; Something went wrong matching. Should we get here?
(do-indent 0)]
[(not last) ;; search backwards for the opening parenthesis, and use it to align this line
[(not last)
;; 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
(let ([enclosing (find-up-sexp pos)])
(do-indent (if enclosing
(+ (visual-offset enclosing) 1)
0)))]
[(= contains last)
;; 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
;; 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
(let ([name-length (let ([id-end (forward-match contains (last-position))])
(if id-end
(- id-end contains)
@ -531,7 +548,15 @@
(indent-first-arg (+ contains
name-length)))))]
[else
(do-indent (indent-first-arg (paragraph-start-position last-para)))])))))
;; 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)]
[next-to-last-para (and next-to-last
(position-paragraph next-to-last))])
(if (equal? last-para next-to-last-para)
(loop next-to-last next-to-last-para)
(do-indent (visual-offset last)))))])))))
(define tabify-selection
(opt-lambda ([start-pos (get-start-position)]