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Variant indenter

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svn: r6966
This commit is contained in:
Kathy Gray 2007-07-25 21:27:38 +00:00
parent a2c0c852bc
commit 7eb84055f8
1 changed files with 34 additions and 4 deletions
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38
collects/profj/tool.ss
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@ -107,12 +107,41 @@
get-start-position get-end-position get-character delete
backward-match backward-containing-sexp
find-string position-paragraph paragraph-start-position
begin-edit-sequence end-edit-sequence)
begin-edit-sequence end-edit-sequence
skip-whitespace forward-match)
(define single-tab-stop 2)
(define eol "\n")
;Returns the position immediately following the nearest open, or the start of the buffer
;In some cases of mismatched parens, returns false
(define/private (get-sexp-start pos)
(let ([sexp-start+whitespace (backward-containing-sexp pos 0)])
(and sexp-start+whitespace
(skip-whitespace sexp-start+whitespace 'backward #t))))
(define/private (get-indentation start-pos)
(let ([to-insert 0])
(letrec ([indent
(let* ([base-offset 0]
[curr-open (get-sexp-start start-pos)])
(cond
[(and (eq? (classify-position start-pos) 'comment)
(eq? (classify-position (add1 start-pos)) 'comment))
base-offset]
[(or (not curr-open) (= curr-open 0)) base-offset]
[else
(let ([previous-line (find-string eol 'backward start-pos 0 #f)])
(cond
[(not previous-line) (+ base-offset single-tab-stop)]
[else
(let* ([last-line-start (skip-whitespace previous-line 'forward #f)]
[last-line-indent (sub1 (- last-line-start previous-line))]
[old-open (get-sexp-start last-line-start)])
(cond
[(<= curr-open old-open) last-line-indent]
[else (+ single-tab-stop last-line-indent)]))]))]))])
(build-string (max indent 0) (λ (x) #\space)))
#;(let ([to-insert 0])
(let loop ([pos start-pos])
(let ([pos-before (backward-containing-sexp pos 0)])
(when pos-before
@ -136,13 +165,14 @@
(begin-edit-sequence)
(let loop ([para start-para])
(let* ([para-start (paragraph-start-position para)]
[insertion (get-indentation para-start)]
[insertion (get-indentation (max 0 (sub1 para-start)) #;para-start)]
[closer? #f])
(let loop ()
(let ([c (get-character para-start)])
(cond
[(and (char-whitespace? c)
(not (char=? c #\newline)))
(not (char=? c #\015))
(not (char=? c #\012)))
(delete para-start (+ para-start 1))
(loop)]
[(char=? #\} c)