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50 lines
1.3 KiB
Racket
50 lines
1.3 KiB
Racket
#lang br
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(require br/indent racket/gui/base)
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(provide indent-jsonic)
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(define indent-width 2)
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(define (left-bracket? c) (member c (list #\{ #\[)))
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(define (right-bracket? c) (member c (list #\} #\])))
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;; if this line begins with } or ], outdent.
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;; if last line begins with { or [, indent.
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;; otherwise use previous indent
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(define/contract (indent-jsonic tbox [posn 0])
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((is-a?/c text%) exact-nonnegative-integer? . -> .
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(or/c exact-nonnegative-integer? #f))
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(define prev-line (previous-line tbox posn))
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(define current-line (line tbox posn))
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(define prev-indent (or (line-indent tbox prev-line) 0))
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(define current-indent
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(cond
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[(left-bracket?
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(line-first-visible-char tbox prev-line))
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(+ prev-indent indent-width)]
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[(right-bracket?
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(line-first-visible-char tbox current-line))
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(- prev-indent indent-width)]
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[else prev-indent]))
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(and (exact-positive-integer? current-indent) current-indent))
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(module+ test
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(require rackunit)
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(define test-str #<<HERE
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#lang jsonic
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{
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"value",
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"string":
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[
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{
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"array": @$(range 5)$@,
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"object": @$(hash 'k1 "valstring")$@
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}
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]
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// "bar"
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}
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HERE
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)
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(check-equal?
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(string-indents (apply-indenter indent-jsonic test-str))
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'(#f #f 2 2 2 4 6 6 4 2 2 #f)))
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