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Merge pull request #1345 from Kodiologist/cond-in-core-macro-def

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Don't use `cond` in the definition of a core macro
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Tuukka Turto 2017-08-02 18:45:17 +03:00 committed by GitHub
commit 3dcf91ab39
1 changed files with 8 additions and 10 deletions
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16
hy/core/macros.hy
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@ -86,16 +86,14 @@
(setv belse (if (and (isinstance lst HyExpression) (= (get lst 0) "else"))
[(body.pop)]
[]))
(cond
[(odd? (len args))
(macro-error args "`for' requires an even number of args.")]
[(empty? body)
(macro-error None "`for' requires a body to evaluate")]
[(empty? args) `(do ~@body ~@belse)]
[(= (len args) 2) `(for* [~@args] (do ~@body) ~@belse)]
[True
(if
(odd? (len args)) (macro-error args "`for' requires an even number of args.")
(empty? body) (macro-error None "`for' requires a body to evaluate")
(empty? args) `(do ~@body ~@belse)
(= (len args) 2) `(for* [~@args] (do ~@body) ~@belse)
(do
(setv alist (cut args 0 None 2))
`(for* [(, ~@alist) (genexpr (, ~@alist) [~@args])] (do ~@body) ~@belse)]))
`(for* [(, ~@alist) (genexpr (, ~@alist) [~@args])] (do ~@body) ~@belse))))
(defmacro -> [head &rest rest]