FileStream fileIn: 'types.st'.
FileStream fileIn: 'printer.st'.
+FileStream fileIn: 'reader.st'.
Object subclass: Core [
Ns := Dictionary new.
[ :args | Core coerce: [ args first value > args second value ] ].
Core Ns at: #>= put:
[ :args | Core coerce: [ args first value >= args second value ] ].
+
+Core Ns at: #'read-string' put:
+ [ :args | Reader readStr: args first value ].
+Core Ns at: #slurp put:
+ [ :args | MALString new: (File path: args first value) contents ].
+
+Core Ns at: #atom put:
+ [ :args | MALAtom new: args first ].
+Core Ns at: #'atom?' put:
+ [ :args | Core coerce: [ args first type = #atom ] ].
+Core Ns at: #deref put:
+ [ :args | args first value ].
+Core Ns at: #'reset!' put:
+ [ :args | args first value: args second. args second ].
+Core Ns at: #'swap!' put:
+ [ :args |
+ | a f x xs result |
+ a := args first.
+ f := args second.
+ f class = Func ifTrue: [ f := f fn ].
+ x := a value.
+ xs := args allButFirst: 2.
+ result := f value: (xs copyWithFirst: x).
+ a value: result.
+ result
+ ].
--- /dev/null
+FileStream fileIn: 'readline.st'.
+FileStream fileIn: 'reader.st'.
+FileStream fileIn: 'printer.st'.
+FileStream fileIn: 'env.st'.
+FileStream fileIn: 'func.st'.
+FileStream fileIn: 'core.st'.
+
+Object subclass: MAL [
+ MAL class >> READ: input [
+ ^Reader readStr: input
+ ]
+
+ MAL class >> evalAst: sexp env: env [
+ sexp class = BlockClosure ifTrue: [^sexp ].
+
+ sexp type = #symbol ifTrue: [
+ ^env get: sexp value
+ ].
+
+ sexp type = #list ifTrue: [
+ ^self evalList: sexp env: env class: MALList
+ ].
+ sexp type = #vector ifTrue: [
+ ^self evalList: sexp env: env class: MALVector
+ ].
+ sexp type = #map ifTrue: [
+ ^self evalList: sexp env: env class: MALMap
+ ].
+
+ ^sexp
+ ]
+
+ MAL class >> evalList: sexp env: env class: aClass [
+ | items |
+ items := sexp value collect:
+ [ :item | self EVAL: item env: env ].
+ ^aClass new: items
+ ]
+
+ MAL class >> EVAL: aSexp env: anEnv [
+ | sexp env ast a0 a0_ a1 a1_ a2 a3 an forms function args |
+
+ "NOTE: redefinition of method arguments is not allowed"
+ sexp := aSexp.
+ env := anEnv.
+
+ [
+ [ :continue |
+ (sexp class = BlockClosure or: [ sexp type ~= #list ]) ifTrue: [
+ ^self evalAst: sexp env: env
+ ].
+ sexp value isEmpty ifTrue: [
+ ^sexp
+ ].
+
+ ast := sexp value.
+ a0 := ast first.
+
+ a0 class ~= BlockClosure ifTrue: [
+ a0_ := ast first value.
+ a0_ = #'def!' ifTrue: [
+ | result |
+ a1_ := ast second value.
+ a2 := ast third.
+ result := self EVAL: a2 env: env.
+ env set: a1_ value: result.
+ ^result
+ ].
+
+ a0_ = #'let*' ifTrue: [
+ | env_ |
+ env_ := Env new: env.
+ a1_ := ast second value.
+ a2 := ast third.
+ 1 to: a1_ size by: 2 do:
+ [ :i | env_ set: (a1_ at: i) value
+ value: (self EVAL: (a1_ at: i + 1)
+ env: env_) ].
+ env := env_.
+ sexp := a2.
+ continue value "TCO"
+ ].
+
+ a0_ = #do ifTrue: [
+ | forms last |
+ ast size < 2 ifTrue: [
+ forms := {}.
+ last := MALObject Nil.
+ ] ifFalse: [
+ forms := ast copyFrom: 2 to: ast size - 1.
+ last := ast last.
+ ].
+
+ forms do: [ :form | self EVAL: form env: env ].
+ sexp := last.
+ continue value "TCO"
+ ].
+
+ a0_ = #if ifTrue: [
+ | condition |
+ a1 := ast second.
+ a2 := ast third.
+ a3 := ast at: 4 ifAbsent: [ MALObject Nil ].
+ condition := self EVAL: a1 env: env.
+
+ (condition type = #false or:
+ [ condition type = #nil ]) ifTrue: [
+ sexp := a3
+ ] ifFalse: [
+ sexp := a2
+ ].
+ continue value "TCO"
+ ].
+
+ a0_ = #'fn*' ifTrue: [
+ | binds env_ fn |
+ a1_ := ast second value.
+ binds := a1_ collect: [ :item | item value ].
+ a2 := ast third.
+ fn := [ :args |
+ self EVAL: a2 env:
+ (Env new: env binds: binds exprs: args) ].
+ ^Func new: a2 params: binds env: env fn: fn
+ ]
+ ].
+
+ forms := (self evalAst: sexp env: env) value.
+ function := forms first.
+ args := forms allButFirst asArray.
+
+ function class = BlockClosure ifTrue: [ ^function value: args ].
+ function class = Func ifTrue: [
+ | env_ |
+ sexp := function ast.
+ env_ := Env new: function env binds: function params
+ exprs: args.
+ env := env_.
+ continue value "TCO"
+ ]
+ ] valueWithExit
+ ] repeat.
+ ]
+
+ MAL class >> PRINT: sexp [
+ ^Printer prStr: sexp printReadably: true
+ ]
+
+ MAL class >> rep: input env: env [
+ ^self PRINT: (self EVAL: (self READ: input) env: env)
+ ]
+]
+
+| input historyFile replEnv argv |
+
+historyFile := '.mal_history'.
+ReadLine readHistory: historyFile.
+replEnv := Env new: nil.
+
+argv := Smalltalk arguments.
+argv notEmpty ifTrue: [ argv := argv allButFirst ].
+argv := OrderedCollection from: (argv collect: [ :arg | MALString new: arg ]).
+
+Core Ns keysAndValuesDo: [ :op :block | replEnv set: op value: block ].
+replEnv set: #eval value: [ :args | MAL EVAL: args first env: replEnv ].
+replEnv set: #'*ARGV*' value: (MALList new: argv).
+
+MAL rep: '(def! not (fn* (a) (if a false true)))' env: replEnv.
+MAL rep: '(def! load-file (fn* (f) (eval (read-string (str "(do " (slurp f) ")")))))' env: replEnv.
+
+Smalltalk arguments notEmpty ifTrue: [
+ MAL rep: '(load-file "', Smalltalk arguments first, '")' env: replEnv
+] ifFalse: [
+ [ input := ReadLine readLine: 'user> '. input isNil ] whileFalse: [
+ input isEmpty ifFalse: [
+ ReadLine addHistory: input.
+ ReadLine writeHistory: historyFile.
+ [ (MAL rep: input env: replEnv) displayNl ]
+ on: MALEmptyInput do: [ #return ]
+ on: MALError do:
+ [ :err | ('error: ', err messageText) displayNl. #return ].
+ ]
+ ].
+
+ '' displayNl.
+]
HCoop / jackhill / mal.git / commitdiff