mirror of
https://github.com/janet-lang/janet
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66 lines
1.7 KiB
Plaintext
66 lines
1.7 KiB
Plaintext
(do
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(: pp nil)
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"Pretty print an array or tuple"
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(: print-seq (fn [start end a seen]
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(: seen (if seen seen {}))
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(if (get seen a) (get seen a)
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(do
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(set! seen a "<cycle>")
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(: parts [])
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(: len (length a))
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(: i 0)
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(while (< i len)
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(push! parts (pp (get a i) seen))
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(push! parts " ")
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(: i (+ 1 i)))
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(if (> len 0) (pop! parts))
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(push! parts end)
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(: ret (apply string start parts))
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(set! seen a ret)
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ret))))
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"Pretty print an object or struct"
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(: print-struct (fn [start end s seen]
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(: seen (if seen seen {}))
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(if (get seen s) (get seen s)
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(do
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(set! seen s "<cycle>")
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(: parts [])
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(: key (next s))
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(while (not (= key nil))
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(push! parts (pp key seen))
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(push! parts " ")
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(push! parts (pp (get s key) seen))
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(push! parts " ")
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(: key (next s key)))
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(if (> (length parts) 0) (pop! parts))
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(push! parts end)
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(: ret (apply string start parts))
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(set! seen s ret)
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ret))))
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"Type handlers"
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(: handlers {
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"array" (fn [a seen] (print-seq "[" "]" a seen))
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"tuple" (fn [a seen] (print-seq "(" ")" a seen))
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"table" (fn [s seen] (print-struct "{" "}" s seen))
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"struct" (fn [s seen] (print-struct "#{" "}" s seen))
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})
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"Define pretty print"
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(: pp (fn [x seen]
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(: handler (get handlers (type x)))
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(: handler (if handler handler tostring))
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(handler x seen)))
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"Export pretty print"
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(export! "pp" pp)
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(: arr [1 2 3 4])
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(push! arr arr)
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(print (pp arr))
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)
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