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https://github.com/janet-lang/janet
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78 lines
2.4 KiB
Plaintext
78 lines
2.4 KiB
Plaintext
(def a (fn [] 2))
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#
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# Copyright (c) 2017 Calvin Rose
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to
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# deal in the Software without restriction, including without limitation the
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# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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# sell copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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# IN THE SOFTWARE.
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#
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# Define a simple pretty printer
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(def pp (do
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(defn pp-seq [pp seen buf a start end]
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(if (get seen a)
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(buffer-push-string buf "<cycle>")
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(do
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(put seen a true)
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(def len (length a))
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(buffer-push-string buf start)
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(for [i 0 len]
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(when (not= i 0) (buffer-push-string buf " "))
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(pp seen buf (get a i)))
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(buffer-push-string buf end)
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))
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buf)
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(defn pp-dict [pp seen buf a start end]
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(if (get seen a)
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(buffer-push-string buf "<cycle>")
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(do
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(put seen a true)
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(var k (next a nil))
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(buffer-push-string buf start)
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(while k
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(def v (get a k))
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(pp seen buf k)
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(buffer-push-string buf " ")
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(pp seen buf v)
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(varset! k (next a k))
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(when k (buffer-push-string buf " "))
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)
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(buffer-push-string buf end)
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))
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buf)
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(def _printers {
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:array (fn [pp seen buf x] (pp-seq pp seen buf x "[" "]"))
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:tuple (fn [pp seen buf x] (pp-seq pp seen buf x "(" ")"))
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:table (fn [pp seen buf x] (pp-dict pp seen buf x "@{" "}"))
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:struct (fn [pp seen buf x] (pp-dict pp seen buf x "{" "}"))
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})
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(defn _default_printer [pp seen buf x]
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(buffer-push-string buf (string x))
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buf)
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(defn pp1 [seen buf x]
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(def pmaybe (get _printers (type x)))
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(def p (if pmaybe pmaybe _default_printer))
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(p pp1 seen buf x))
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(fn [x] (print (pp1 @{} @"" x)))))
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