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Add step 7
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sogaiu
parent
02e6068f75
commit
0484982a44
@ -159,6 +159,42 @@
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(t.reset!* atom-ast
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((t.get-value fn-ast) args-tbl))))))
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(local mal-cons
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(t.make-fn
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(fn [asts]
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(when (< (length asts) 2)
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(u.throw* (t.make-string "cons takes 2 arguments")))
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(let [head-ast (. asts 1)
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tail-ast (. asts 2)]
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(t.make-list [head-ast
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(table.unpack (t.get-value tail-ast))])))))
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(local mal-concat
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(t.make-fn
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(fn [asts]
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(local acc [])
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(for [i 1 (length asts)]
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(each [j elt (ipairs (t.get-value (. asts i)))]
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(table.insert acc elt)))
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(t.make-list acc))))
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(local mal-vec
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(t.make-fn
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(fn [asts]
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(when (< (length asts) 1)
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(u.throw* (t.make-string "vec takes 1 argument")))
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(let [ast (. asts 1)]
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(if (t.vector?* ast)
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ast
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;;
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(t.list?* ast)
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(t.make-vector (t.get-value ast))
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;;
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(t.nil?* ast)
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(t.make-vector [])
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;;
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(u.throw* (t.make-string "vec takes a vector, list, or nil")))))))
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{"+" (t.make-fn (fn [asts]
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(var total 0)
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(each [i val (ipairs asts)]
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@ -231,4 +267,7 @@
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"deref" mal-deref
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"reset!" mal-reset!
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"swap!" mal-swap!
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"cons" mal-cons
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"concat" mal-concat
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"vec" mal-vec
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}
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223
impls/fennel/step7_quote.fnl
Normal file
223
impls/fennel/step7_quote.fnl
Normal file
@ -0,0 +1,223 @@
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(local printer (require :printer))
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(local reader (require :reader))
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(local t (require :types))
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(local e (require :env))
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(local core (require :core))
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(local u (require :utils))
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(local repl_env
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(let [env (e.make-env)]
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(each [name func (pairs core)]
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(e.env-set env
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(t.make-symbol name)
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func))
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env))
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(fn READ
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[code-str]
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(reader.read_str code-str))
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;; forward declaration
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(var EVAL 1)
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(fn eval_ast
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[ast env]
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(if (t.symbol?* ast)
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(e.env-get env ast)
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;;
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(t.list?* ast)
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(t.make-list (u.map (fn [elt-ast]
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(EVAL elt-ast env))
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(t.get-value ast)))
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;;
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(t.vector?* ast)
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(t.make-vector (u.map (fn [elt-ast]
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(EVAL elt-ast env))
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(t.get-value ast)))
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;;
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(t.hash-map?* ast)
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(t.make-hash-map (u.map (fn [elt-ast]
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(EVAL elt-ast env))
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(t.get-value ast)))
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;;
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ast))
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(fn starts-with
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[ast name]
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(when (and (t.list?* ast)
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(not (t.empty?* ast)))
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(let [head-ast (. (t.get-value ast) 1)]
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(and (t.symbol?* head-ast)
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(= name (t.get-value head-ast))))))
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(var quasiquote* nil)
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(fn qq-iter
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[ast]
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(if (t.empty?* ast)
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(t.make-list [])
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(let [ast-value (t.get-value ast)
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elt (. ast-value 1)
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acc (qq-iter (t.make-list (u.slice ast-value 2 -1)))]
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(if (starts-with elt "splice-unquote")
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(t.make-list [(t.make-symbol "concat")
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(. (t.get-value elt) 2)
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acc])
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(t.make-list [(t.make-symbol "cons")
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(quasiquote* elt)
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acc])))))
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(set quasiquote*
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(fn [ast]
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(if (starts-with ast "unquote")
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(. (t.get-value ast) 2)
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;;
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(t.list?* ast)
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(qq-iter ast)
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;;
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(t.vector?* ast)
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(t.make-list [(t.make-symbol "vec") (qq-iter ast)])
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;;
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(or (t.symbol?* ast)
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(t.hash-map?* ast))
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(t.make-list [(t.make-symbol "quote") ast])
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;;
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ast)))
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(set EVAL
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(fn [ast-param env-param]
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(var ast ast-param)
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(var env env-param)
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(var result nil)
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(while (not result)
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(if (not (t.list?* ast))
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(set result (eval_ast ast env))
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;;
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(t.empty?* ast)
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(set result ast)
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;;
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(let [ast-elts (t.get-value ast)
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head-name (t.get-value (. ast-elts 1))]
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;; XXX: want to check for symbol, but that screws up logic below
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(if (= "def!" head-name)
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(let [def-name (. ast-elts 2)
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def-val (EVAL (. ast-elts 3) env)]
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(e.env-set env
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def-name def-val)
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(set result def-val))
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;;
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(= "let*" head-name)
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(let [new-env (e.make-env env)
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bindings (t.get-value (. ast-elts 2))
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stop (/ (length bindings) 2)]
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(for [idx 1 stop]
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(let [b-name (. bindings (- (* 2 idx) 1))
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b-val (EVAL (. bindings (* 2 idx)) new-env)]
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(e.env-set new-env
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b-name b-val)))
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;; tco
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(set ast (. ast-elts 3))
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(set env new-env))
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;;
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(= "quote" head-name)
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;; tco
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(set result (. ast-elts 2))
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;;
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(= "quasiquoteexpand" head-name)
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;; tco
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(set result (quasiquote* (. ast-elts 2)))
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;;
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(= "quasiquote" head-name)
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;; tco
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(set ast (quasiquote* (. ast-elts 2)))
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;;
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(= "do" head-name)
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(let [most-forms (u.slice ast-elts 2 -2) ;; XXX
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last-body-form (u.last ast-elts)
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res-ast (eval_ast (t.make-list most-forms) env)]
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;; tco
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(set ast last-body-form))
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;;
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(= "if" head-name)
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(let [cond-res (EVAL (. ast-elts 2) env)]
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(if (or (t.nil?* cond-res)
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(t.false?* cond-res))
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(let [else-ast (. ast-elts 4)]
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(if (not else-ast)
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;; tco
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(set result t.mal-nil)
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(set ast else-ast)))
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;; tco
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(set ast (. ast-elts 3))))
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;;
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(= "fn*" head-name)
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(let [params (t.get-value (. ast-elts 2))
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body (. ast-elts 3)]
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;; tco
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(set result
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(t.make-fn (fn [args]
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(EVAL body
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(e.make-env env params args)))
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body params env)))
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;;
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(let [eval-list (t.get-value (eval_ast ast env))
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f (. eval-list 1)
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args (u.slice eval-list 2 -1)]
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(let [body (t.get-ast f)] ;; tco
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(if body
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(do
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(set ast body)
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(set env (e.make-env (t.get-env f)
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(t.get-params f) args)))
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(set result
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((t.get-value f) args)))))))))
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result))
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(fn PRINT
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[ast]
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(printer.pr_str ast true))
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(fn rep
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[code-str]
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(PRINT (EVAL (READ code-str) repl_env)))
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(rep "(def! not (fn* (a) (if a false true)))")
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(e.env-set repl_env
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(t.make-symbol "eval")
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(t.make-fn
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(fn [asts]
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(when (< (length asts) 1)
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;; XXX
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(error "eval takes 1 arguments"))
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(EVAL (u.first asts) repl_env))))
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(rep "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \"\nnil)\")))))")
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(e.env-set repl_env
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(t.make-symbol "*ARGV*")
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(t.make-list (u.map t.make-string (u.slice arg 2 -1))))
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(fn handle-error
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[err]
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(if (t.nil?* err)
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(print)
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(= "string" (type err))
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(print err)
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(print (.. "Error: " (PRINT err)))))
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(if (<= 1 (length arg))
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(xpcall (fn []
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(rep (.. "(load-file \"" (. arg 1) "\")"))) ;; XXX: escaping?
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handle-error)
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(do
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(var done false)
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(while (not done)
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(io.write "user> ")
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(io.flush)
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(let [input (io.read)]
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(if (not input)
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(set done true)
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(xpcall (fn []
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(print (rep input)))
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handle-error))))))
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