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(.module:
lux
(lux (control ["ex" exception #+ exception:])
(data [bit]
[maybe]
["e" error #+ Error]
text/format
(coll [array]))
[host])
(luxc [lang]
(lang (host [js #+ JS Expression Statement])))
[//])
(do-template [<name>]
[(exception: #export (<name> {message Text})
message)]
[Unknown-Kind-Of-JS-Object]
[Null-Has-No-Lux-Representation]
[Cannot-Evaluate]
)
(host.import java/lang/Object
(toString [] String))
(host.import java/lang/Integer
(longValue [] Long))
(host.import java/lang/Number
(doubleValue [] double)
(longValue [] Long)
(intValue [] Integer))
(host.import javax/script/ScriptEngine
(eval [String] #try #? Object))
(host.import jdk/nashorn/api/scripting/JSObject
(isArray [] boolean)
(isFunction [] boolean)
(getMember [String] #? Object)
(hasMember [String] boolean))
(host.import jdk/nashorn/api/scripting/AbstractJSObject)
(host.import jdk/nashorn/api/scripting/ScriptObjectMirror
(size [] int))
(host.import jdk/nashorn/internal/runtime/Undefined)
(host.import luxc/lang/translation/js/IntValue
(getValue [] Long))
(host.import luxc/lang/translation/js/StructureValue
(getValue [] (Array Object)))
(def: (int js-object)
(-> ScriptObjectMirror (Maybe Int))
(case [(JSObject::getMember [//.int-high-field] js-object)
(JSObject::getMember [//.int-low-field] js-object)]
(^multi [(#.Some high) (#.Some low)]
(and (host.instance? Number high)
(host.instance? Number low))
[[(Number::longValue [] (:coerce Number high))
(Number::longValue [] (:coerce Number low))]
[high low]])
(#.Some (.int (n/+ (|> high (:coerce Nat) (bit.left-shift +32))
(if (i/< 0 (:coerce Int low))
(|> low (:coerce Nat) (bit.left-shift +32) (bit.logical-right-shift +32))
(|> low (:coerce Nat))))))
_
#.None))
(def: (variant lux-object js-object)
(-> (-> Object (Error Any)) ScriptObjectMirror (Maybe Any))
(case [(JSObject::getMember [//.variant-tag-field] js-object)
(JSObject::getMember [//.variant-flag-field] js-object)
(JSObject::getMember [//.variant-value-field] js-object)]
(^multi [(#.Some tag) ?flag (#.Some value)]
(host.instance? Number tag)
[[(Number::intValue [] (:coerce Number tag))
(lux-object value)]
[tag (#.Some value)]])
(#.Some [tag (maybe.default (host.null) ?flag) value])
_
#.None))
(def: (array lux-object js-object)
(-> (-> Object (Error Any)) ScriptObjectMirror (Maybe (Array Object)))
(if (JSObject::isArray [] js-object)
(let [init-num-keys (.nat (ScriptObjectMirror::size [] js-object))]
(loop [num-keys init-num-keys
idx +0
output (: (Array Object)
(array.new init-num-keys))]
(if (n/< num-keys idx)
(let [idx-key (|> idx .int %i)]
(case (JSObject::getMember idx-key js-object)
(#.Some member)
(case (lux-object member)
(#e.Success parsed-member)
(recur num-keys (inc idx) (array.write idx (:coerce Object parsed-member) output))
(#e.Error error)
#.None)
#.None
(recur num-keys (inc idx) output)))
(#.Some output))))
#.None))
(def: (lux-object js-object)
(-> Object (Error Any))
(`` (cond (host.null? js-object)
(ex.throw Null-Has-No-Lux-Representation "")
(host.instance? Integer js-object)
(ex.return (Integer::longValue [] (:coerce Integer js-object)))
(or (host.instance? java/lang/Boolean js-object)
(host.instance? java/lang/String js-object))
(ex.return js-object)
(host.instance? Number js-object)
(ex.return (Number::doubleValue [] (:coerce Number js-object)))
(~~ (do-template [<interface> <method>]
[(host.instance? <interface> js-object)
(ex.return (<method> [] (:coerce <interface> js-object)))]
[StructureValue StructureValue::getValue]
[IntValue IntValue::getValue]))
(host.instance? ScriptObjectMirror js-object)
(let [js-object (:coerce ScriptObjectMirror js-object)]
(case (int js-object)
(#.Some value)
(ex.return value)
#.None
(case (variant lux-object js-object)
(#.Some value)
(ex.return value)
#.None
(case (array lux-object js-object)
(#.Some value)
(ex.return value)
#.None
## (JSObject::isFunction [] js-object)
## js-object
## else
(ex.throw Unknown-Kind-Of-JS-Object (Object::toString [] (:coerce Object js-object)))))))
## else
(ex.throw Unknown-Kind-Of-JS-Object (Object::toString [] (:coerce Object js-object))))))
(def: #export (eval code)
(-> Expression (Meta Any))
(function (_ compiler)
(case (|> compiler
(get@ #.host)
(:coerce //.Host)
(get@ #//.interpreter)
(ScriptEngine::eval [code]))
(#e.Error error)
((lang.throw Cannot-Evaluate error) compiler)
(#e.Success output)
(case output
#.None
(#e.Success [compiler []])
(#.Some output)
(case (lux-object output)
(#e.Success parsed-output)
(#e.Success [compiler parsed-output])
(#e.Error error)
((lang.throw Cannot-Evaluate error) compiler))))))
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