71 lines
1.7 KiB
Hy
71 lines
1.7 KiB
Hy
;; Copyright 2019 the authors.
|
|
;; This file is part of Hy, which is free software licensed under the Expat
|
|
;; license. See the LICENSE.
|
|
|
|
(defmacro do-until [&rest args]
|
|
(import
|
|
[hy.model-patterns [whole FORM notpexpr dolike]]
|
|
[funcparserlib.parser [many]])
|
|
(setv [body condition] (->> args (.parse (whole
|
|
[(many (notpexpr "until")) (dolike "until")]))))
|
|
(setv g (gensym))
|
|
`(do
|
|
(setv ~g True)
|
|
(while (or ~g (not (do ~@condition)))
|
|
~@body
|
|
(setv ~g False))))
|
|
|
|
(defn test-do-until []
|
|
(setv n 0 s "")
|
|
(do-until
|
|
(+= s "x")
|
|
(until (+= n 1) (>= n 3)))
|
|
(assert (= s "xxx"))
|
|
(do-until
|
|
(+= s "x")
|
|
(until (+= n 1) (>= n 3)))
|
|
(assert (= s "xxxx")))
|
|
|
|
(defmacro loop [&rest args]
|
|
(import
|
|
[hy.model-patterns [whole FORM sym SYM]]
|
|
[funcparserlib.parser [many]])
|
|
(setv [loopers body] (->> args (.parse (whole [
|
|
(many (|
|
|
(>> (+ (sym "while") FORM) (fn [x] [x]))
|
|
(+ (sym "for") SYM (sym "in") FORM)
|
|
(+ (sym "for") SYM (sym "from") FORM (sym "to") FORM)))
|
|
(sym "do")
|
|
(many FORM)]))))
|
|
(defn f [loopers]
|
|
(setv [head tail] [(first loopers) (cut loopers 1)])
|
|
(print head)
|
|
(cond
|
|
[(none? head)
|
|
`(do ~@body)]
|
|
[(= (len head) 1)
|
|
`(while ~@head ~(f tail))]
|
|
[(= (len head) 2)
|
|
`(for [~@head] ~(f tail))]
|
|
[True ; (= (len head) 3)
|
|
(setv [sym from to] head)
|
|
`(for [~sym (range ~from (inc ~to))] ~(f tail))]))
|
|
(f loopers))
|
|
|
|
(defn test-loop []
|
|
|
|
(setv l [])
|
|
(loop
|
|
for x in "abc"
|
|
do (.append l x))
|
|
(assert (= l ["a" "b" "c"]))
|
|
|
|
(setv l [] k 2)
|
|
(loop
|
|
while (> k 0)
|
|
for n from 1 to 3
|
|
for p in [k n (* 10 n)]
|
|
do (.append l p) (-= k 1))
|
|
(print l)
|
|
(assert (= l [2 1 10 -1 2 20 -4 3 30])))
|