forked from Mirrors/wasm3
Volodymyr Shymanskyy
3 years ago
parent
cf994bb3ea
commit
cdee84bd06
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# mal (Make a Lisp)
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[mal](https://github.com/kanaka/mal) is a Lisp interpreter.
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### Running
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```sh
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# REPL:
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../../../build/wasm3 mal.wasm
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# Self-hosted REPL:
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../../../build/wasm3 mal.wasm ./mal.mal
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# Fibonacci test:
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../../../build/wasm3 mal.wasm ./test-fib.mal 16
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987
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# Self-hosted Fibonacci test (takes ~10 seconds):
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../../../build/wasm3 mal.wasm ./mal.mal ./test-fib.mal 10
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55
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```
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(def! _macro? (fn* [x]
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(if (map? x)
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(contains? x :__MAL_MACRO__)
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false)))
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(def! core_ns
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[['= =]
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['throw throw]
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['nil? nil?]
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['true? true?]
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['false? false?]
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['number? number?]
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['string? string?]
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['symbol symbol]
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['symbol? symbol?]
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['keyword keyword]
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['keyword? keyword?]
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['fn? fn?]
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['macro? _macro?]
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['pr-str pr-str]
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['str str]
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['prn prn]
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['println println]
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['readline readline]
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['read-string read-string]
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['slurp slurp]
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['< <]
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['<= <=]
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['> >]
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['>= >=]
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['+ +]
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['- -]
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['* *]
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['/ /]
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['time-ms time-ms]
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['list list]
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['list? list?]
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['vector vector]
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['vector? vector?]
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['hash-map hash-map]
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['map? map?]
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['assoc assoc]
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['dissoc dissoc]
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['get get]
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['contains? contains?]
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['keys keys]
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['vals vals]
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['sequential? sequential?]
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['cons cons]
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['concat concat]
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['vec vec]
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['nth nth]
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['first first]
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['rest rest]
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['empty? empty?]
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['count count]
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['apply apply]
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['map map]
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['conj conj]
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['seq seq]
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['with-meta with-meta]
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['meta meta]
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['atom atom]
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['atom? atom?]
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['deref deref]
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['reset! reset!]
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['swap! swap!]])
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@ -0,0 +1,34 @@
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(def! bind-env (fn* [env b e]
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(if (empty? b)
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env
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(let* [b0 (first b)]
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(if (= '& b0)
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(assoc env (str (nth b 1)) e)
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(bind-env (assoc env (str b0) (first e)) (rest b) (rest e)))))))
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(def! new-env (fn* [& args]
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(if (<= (count args) 1)
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(atom {:outer (first args)})
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(atom (apply bind-env {:outer (first args)} (rest args))))))
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(def! env-find (fn* [env k]
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(env-find-str env (str k))))
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(def! env-find-str (fn* [env ks]
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(if env
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(let* [data @env]
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(if (contains? data ks)
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env
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(env-find-str (get data :outer) ks))))))
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(def! env-get (fn* [env k]
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(let* [ks (str k)
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e (env-find-str env ks)]
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(if e
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(get @e ks)
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(throw (str "'" ks "' not found"))))))
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(def! env-set (fn* [env k v]
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(do
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(swap! env assoc (str k) v)
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v)))
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@ -0,0 +1,152 @@
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(load-file "./env.mal")
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(load-file "./core.mal")
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;; read
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(def! READ read-string)
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;; eval
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(def! qq-loop (fn* [elt acc]
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(if (if (list? elt) (= (first elt) 'splice-unquote)) ; 2nd 'if' means 'and'
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(list 'concat (nth elt 1) acc)
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(list 'cons (QUASIQUOTE elt) acc))))
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(def! qq-foldr (fn* [xs]
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(if (empty? xs)
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(list)
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(qq-loop (first xs) (qq-foldr (rest xs))))))
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(def! QUASIQUOTE (fn* [ast]
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(cond
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(vector? ast) (list 'vec (qq-foldr ast))
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(map? ast) (list 'quote ast)
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(symbol? ast) (list 'quote ast)
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(not (list? ast)) ast
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(= (first ast) 'unquote) (nth ast 1)
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"else" (qq-foldr ast))))
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(def! MACROEXPAND (fn* [ast env]
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(let* [a0 (if (list? ast) (first ast))
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e (if (symbol? a0) (env-find env a0))
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m (if e (env-get e a0))]
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(if (_macro? m)
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(MACROEXPAND (apply (get m :__MAL_MACRO__) (rest ast)) env)
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ast))))
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(def! eval-ast (fn* [ast env]
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;; (do (prn "eval-ast" ast "/" (keys env)) )
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(cond
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(symbol? ast) (env-get env ast)
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(list? ast) (map (fn* [exp] (EVAL exp env)) ast)
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(vector? ast) (vec (map (fn* [exp] (EVAL exp env)) ast))
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(map? ast) (apply hash-map
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(apply concat
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(map (fn* [k] [k (EVAL (get ast k) env)])
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(keys ast))))
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"else" ast)))
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(def! LET (fn* [env binds form]
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(if (empty? binds)
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(EVAL form env)
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(do
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(env-set env (first binds) (EVAL (nth binds 1) env))
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(LET env (rest (rest binds)) form)))))
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(def! EVAL (fn* [ast env]
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;; (do (prn "EVAL" ast "/" (keys @env)) )
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(let* [ast (MACROEXPAND ast env)]
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(if (not (list? ast))
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(eval-ast ast env)
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;; apply list
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(let* [a0 (first ast)]
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(cond
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(empty? ast)
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ast
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(= 'def! a0)
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(env-set env (nth ast 1) (EVAL (nth ast 2) env))
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(= 'let* a0)
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(LET (new-env env) (nth ast 1) (nth ast 2))
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(= 'quote a0)
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(nth ast 1)
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(= 'quasiquoteexpand a0)
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(QUASIQUOTE (nth ast 1))
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(= 'quasiquote a0)
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(EVAL (QUASIQUOTE (nth ast 1)) env)
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(= 'defmacro! a0)
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(env-set env (nth ast 1) (hash-map :__MAL_MACRO__
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(EVAL (nth ast 2) env)))
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(= 'macroexpand a0)
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(MACROEXPAND (nth ast 1) env)
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(= 'try* a0)
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(if (< (count ast) 3)
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(EVAL (nth ast 1) env)
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(try*
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(EVAL (nth ast 1) env)
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(catch* exc
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(let* [a2 (nth ast 2)]
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(EVAL (nth a2 2) (new-env env [(nth a2 1)] [exc]))))))
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(= 'do a0)
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(let* [el (eval-ast (rest ast) env)]
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(nth el (- (count el) 1)))
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(= 'if a0)
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(if (EVAL (nth ast 1) env)
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(EVAL (nth ast 2) env)
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(if (> (count ast) 3)
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(EVAL (nth ast 3) env)))
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(= 'fn* a0)
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(fn* [& args] (EVAL (nth ast 2) (new-env env (nth ast 1) args)))
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"else"
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(let* [el (eval-ast ast env)]
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(apply (first el) (rest el)))))))))
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;; print
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(def! PRINT pr-str)
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;; repl
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(def! repl-env (new-env))
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(def! rep (fn* [strng]
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(PRINT (EVAL (READ strng) repl-env))))
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;; core.mal: defined directly using mal
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(map (fn* [data] (apply env-set repl-env data)) core_ns)
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(env-set repl-env 'eval (fn* [ast] (EVAL ast repl-env)))
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(env-set repl-env '*ARGV* (rest *ARGV*))
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;; core.mal: defined using the new language itself
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(rep (str "(def! *host-language* \"" *host-language* "-mal\")"))
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(rep "(def! not (fn* [a] (if a false true)))")
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(rep "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \"\nnil)\")))))")
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(rep "(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw \"odd number of forms to cond\")) (cons 'cond (rest (rest xs)))))))")
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;; repl loop
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(def! repl-loop (fn* [line]
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(if line
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(do
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(if (not (= "" line))
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(try*
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(println (rep line))
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(catch* exc
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(println "Uncaught exception:" exc))))
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(repl-loop (readline "mal-user> "))))))
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;; main
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(if (empty? *ARGV*)
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(repl-loop "(println (str \"Mal [\" *host-language* \"]\"))")
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(rep (str "(load-file \"" (first *ARGV*) "\")")))
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;; Compute a Fibonacci number with two recursions.
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(def! fib
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(fn* [n] ; non-negative number
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(if (<= n 1)
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n
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(+ (fib (- n 1)) (fib (- n 2))))))
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(println (fib (read-string (first *ARGV*))))
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