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Code Issues 1 Releases Wiki Activity

do not expand false branch more than once

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Fixes #1191
This commit is contained in:
primo-ppcg 2023-06-11 19:15:48 +07:00
parent 32c5b816ae
commit 2a7ea27bb7
2 changed files with 13 additions and 6 deletions
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12
src/boot/boot.janet
View File

@ -668,18 +668,20 @@
(def len (length bindings))
(if (= 0 len) (error "expected at least 1 binding"))
(if (odd? len) (error "expected an even number of bindings"))
(def res (gensym))
(defn aux [i]
(if (>= i len)
tru
~(do (set ,res ,tru) true)
(do
(def bl (in bindings i))
(def br (in bindings (+ 1 i)))
(if (symbol? bl)
~(if (def ,bl ,br) ,(aux (+ 2 i)) ,fal)
~(if (def ,bl ,br) ,(aux (+ 2 i)))
~(if (def ,(def sym (gensym)) ,br)
(do (def ,bl ,sym) ,(aux (+ 2 i)))
,fal)))))
(aux 0))
(do (def ,bl ,sym) ,(aux (+ 2 i))))))))
~(do
(var ,res nil)
(if ,(aux 0) ,res ,fal)))
(defmacro when-let
"Same as `(if-let bindings (do ;body))`."

7
test/suite-boot.janet
View File

@ -130,7 +130,12 @@
(assert (= (if-let [[a b] my-array] a) 1) "if-let 5")
(assert (= (if-let [{:a a :b b} {:a 1 :b 2}] b) 2) "if-let 6")
(assert (= (if-let [[a b] nil] :t :f) :f) "if-let 7")
(assert (= (if-let [a true b false] b a) true) "if-let 8")
# #1191
(var cnt 0)
(defmacro upcnt [] (++ cnt))
(assert (= (if-let [a true b true c true] nil (upcnt)) nil) "issue #1191")
(assert (= cnt 1) "issue #1191")
(assert (= 14 (sum (map inc @[1 2 3 4]))) "sum map")
(def myfun (juxt + - * /))