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Complete if-let

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Scott Richmond 2022-06-19 14:01:55 -04:00
parent 689f3f23bc
commit 4254359934
1 changed files with 19 additions and 5 deletions
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24
src/ludus/interpreter.clj
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@ -136,7 +136,7 @@
::ast/word
(let [word (:word pattern)]
(if (contains? ctx word)
{:success false :reason (str "Name " word " is already bound")}
{:success false :reason (str "Name " word " is already bound") :code :name-error}
{:success true :ctx {word value}}))
::ast/tuple (match-tuple pattern value ctx-vol)
@ -165,7 +165,19 @@
(throw (ex-info (:reason match) {:ast ast})))
value))
(defn- interpret-if-let [ast ctx])
(defn- interpret-if-let [ast ctx]
(let [pattern (:pattern ast)
expr (:expr ast)
value (interpret-ast expr ctx)
match (match pattern value ctx)
success (:success match)]
(if success
(do
(vswap! ctx update-ctx (:ctx match))
value)
(if (:code match)
(throw (ex-info (:reason match) {:ast ast}))
false))))
(defn- interpret-if [ast ctx]
(let [if-expr (:if ast)
@ -649,12 +661,14 @@
)))))
(do
(comment
(process/start-vm)
(def source "
let foo = 3
let foo = (:a, :b)
if let 3 = foo then :foo else :bar
if let (x, y) = foo then :foo else :bar
y
")