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48 lines
1.1 KiB
Racket
48 lines
1.1 KiB
Racket
#lang br
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(require br/indent racket/contract racket/gui/base)
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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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(define (indent-jsonic tbox [posn 0])
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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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(cond
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[(not prev-line) 0]
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[else
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(define prev-indent (or (line-indent tbox prev-line) 0))
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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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(provide
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(contract-out
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[indent-jsonic (((is-a?/c text%))
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(exact-nonnegative-integer?) . ->* .
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exact-nonnegative-integer?)]))
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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": 42,
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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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'(0 0 2 2 2 4 6 6 4 2 2 0))) |