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|
(;module:
lux
(lux (control ["p" parser])
(data [maybe]
["e" error]
[number]
[product]
text/format
(coll [list "list/" Functor<List> Fold<List> Monoid<List>]
[dict #+ Dict]))
(meta [code]
["s" syntax]))
(luxc ["&" base]
(lang ["la" analysis]
["ls" synthesis]
(synthesis [";S" case]
[";S" function]
[";S" loop])
[";L" variable #+ Variable])
))
(def: init-env (List Variable) (list))
(def: init-resolver (Dict Int Int) (dict;new number;Hash<Int>))
(def: (prepare-body inner-arity arity body)
(-> ls;Arity ls;Arity ls;Synthesis ls;Synthesis)
(if (functionS;nested? inner-arity)
body
(loopS;reify-recursion arity body)))
(def: (let$ register inputS bodyS)
(-> Nat ls;Synthesis ls;Synthesis ls;Synthesis)
(` ("lux let" (~ (code;nat register)) (~ inputS) (~ bodyS))))
(def: (if$ testS thenS elseS)
(-> ls;Synthesis ls;Synthesis ls;Synthesis ls;Synthesis)
(` ("lux if" (~ testS)
(~ thenS)
(~ elseS))))
(def: (function$ arity environment body)
(-> ls;Arity (List Variable) ls;Synthesis ls;Synthesis)
(` ("lux function" (~ (code;nat arity))
[(~@ (list/map code;int environment))]
(~ body))))
(def: (variant$ tag last? valueS)
(-> Nat Bool ls;Synthesis ls;Synthesis)
(` ((~ (code;nat tag)) (~ (code;bool last?)) (~ valueS))))
(def: (var$ var)
(-> Variable ls;Synthesis)
(` ((~ (code;int var)))))
(def: (procedure$ name argsS)
(-> Text (List ls;Synthesis) ls;Synthesis)
(` ((~ (code;text name)) (~@ argsS))))
(def: (call$ funcS argsS)
(-> ls;Synthesis (List ls;Synthesis) ls;Synthesis)
(` ("lux call" (~ funcS) (~@ argsS))))
(def: (synthesize-case synthesize outer-arity inputA branchesA)
(-> (-> la;Analysis ls;Synthesis)
ls;Arity la;Analysis (List [la;Pattern la;Analysis])
ls;Synthesis)
(let [inputS (synthesize inputA)]
(case (list;reverse branchesA)
(^multi (^ (list [(^code ("lux case bind" (~ [_ (#;Nat input-register)])))
(^code ((~ [_ (#;Int var)])))]))
(not (variableL;captured? var))
(n.= input-register (int-to-nat var)))
inputS
(^ (list [(^code ("lux case bind" (~ [_ (#;Nat register)]))) bodyA]))
(let$ (if (functionS;nested? outer-arity)
(|> register variableL;local (functionS;adjust-var outer-arity) variableL;local-register)
register)
inputS
(synthesize bodyA))
(^or (^ (list [(^code true) thenA] [(^code false) elseA]))
(^ (list [(^code false) elseA] [(^code true) thenA])))
(if$ inputS (synthesize thenA) (synthesize elseA))
(#;Cons [lastP lastA] prevsPA)
(let [transform-branch (: (-> la;Pattern la;Analysis ls;Path)
(function [pattern expr]
(|> (synthesize expr)
(~) ("lux case exec")
("lux case seq" (~ (caseS;path outer-arity pattern)))
(`))))
pathS (list/fold caseS;weave
(transform-branch lastP lastA)
(list/map (product;uncurry transform-branch) prevsPA))]
(` ("lux case" (~ inputS) (~ pathS))))
_
(undefined)
)))
(def: (synthesize-apply synthesize outer-arity num-locals exprA)
(-> (-> la;Analysis ls;Synthesis) ls;Arity Nat la;Analysis ls;Synthesis)
(let [[funcA argsA] (functionS;unfold-apply exprA)
funcS (synthesize funcA)
argsS (list/map synthesize argsA)]
(case funcS
(^multi (^ [_ (#;Form (list [_ (#;Text "lux function")] [_ (#;Nat _arity)] [_ (#;Tuple _env)] _bodyS))])
(and (n.= _arity (list;size argsS))
(not (loopS;contains-self-reference? _bodyS)))
[(s;run _env (p;some s;int)) (#e;Success _env)])
(let [register-offset (if (functionS;top? outer-arity)
num-locals
(|> outer-arity n.inc (n.+ num-locals)))]
(` ("lux loop" (~ (code;nat register-offset)) [(~@ argsS)]
(~ (loopS;adjust _env register-offset _bodyS)))))
(^ [_ (#;Form (list& [_ (#;Text "lux call")] funcS' argsS'))])
(call$ funcS' (list/compose argsS' argsS))
_
(call$ funcS argsS))))
(def: #export (synthesize expressionA)
(-> la;Analysis ls;Synthesis)
(loop [outer-arity +0
resolver init-resolver
direct? false
num-locals +0
expressionA expressionA]
(case expressionA
(^code [(~ _left) (~ _right)])
(` [(~@ (list/map (recur outer-arity resolver false num-locals) (la;unfold-tuple expressionA)))])
(^or (^code ("lux sum left" (~ _)))
(^code ("lux sum right" (~ _))))
(let [[tag last? value] (maybe;assume (la;unfold-variant expressionA))]
(variant$ tag last? (recur outer-arity resolver false num-locals value)))
(^code ((~ [_ (#;Int var)])))
(if (variableL;local? var)
(if (functionS;nested? outer-arity)
(if (variableL;self? var)
(call$ (var$ 0) (|> (list;n.range +1 (n.dec outer-arity))
(list/map (|>. variableL;local code;int (~) () (`)))))
(var$ (functionS;adjust-var outer-arity var)))
(var$ var))
(var$ (maybe;default var (dict;get var resolver))))
(^code ("lux case" (~ inputA) (~ [_ (#;Record branchesA)])))
(synthesize-case (recur outer-arity resolver false num-locals) outer-arity inputA branchesA)
(^multi (^code ("lux function" [(~@ scope)] (~ bodyA)))
[(s;run scope (p;some s;int)) (#e;Success raw-env)])
(let [inner-arity (if direct?
(n.inc outer-arity)
+1)
env (list/map (function [closure]
(case (dict;get closure resolver)
(#;Some resolved)
(if (and (variableL;local? resolved)
(functionS;nested? outer-arity)
(|> resolved variableL;local-register (n.>= outer-arity)))
(functionS;adjust-var outer-arity resolved)
resolved)
#;None
(if (and (variableL;local? closure)
(functionS;nested? outer-arity))
(functionS;adjust-var outer-arity closure)
closure)))
raw-env)
env-vars (: (List Variable)
(case raw-env
#;Nil (list)
_ (|> (list;size raw-env) n.dec (list;n.range +0) (list/map variableL;captured))))
resolver' (if (and (functionS;nested? inner-arity)
direct?)
(list/fold (function [[from to] resolver']
(dict;put from to resolver'))
init-resolver
(list;zip2 env-vars env))
(list/fold (function [var resolver']
(dict;put var var resolver'))
init-resolver
env-vars))]
(case (recur inner-arity resolver' true num-locals bodyA)
(^ [_ (#;Form (list [_ (#;Text "lux function")] [_ (#;Nat arity')] env' bodyS'))])
(let [arity (n.inc arity')]
(function$ arity env (prepare-body inner-arity arity bodyS')))
bodyS
(function$ +1 env (prepare-body inner-arity +1 bodyS))))
(^code ("lux apply" (~@ _)))
(synthesize-apply (recur outer-arity resolver false num-locals) outer-arity num-locals expressionA)
(^code ((~ [_ (#;Text name)]) (~@ args)))
(procedure$ name (list/map (recur outer-arity resolver false num-locals) args))
_
expressionA)))
|
