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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 [python #+ Expression Statement])))
[//])
(do-template [<name>]
[(exception: #export (<name> {message Text})
message)]
[Not-A-Variant]
[Unknown-Kind-Of-Host-Object]
[Null-Has-No-Lux-Representation]
[Cannot-Evaluate]
)
(host.import: java/lang/Object
(toString [] String)
(getClass [] (Class Object)))
(host.import: java/lang/Long
(intValue [] Integer))
(host.import: org/python/core/PyType
(getName [] String))
(host.import: org/python/core/PyString
(new [String]))
(host.import: org/python/core/PyObject
(asLong [] long)
(asDouble [] double)
(asString [] String)
(__nonzero__ [] boolean)
(__getitem__ [int] #try PyObject)
(__getitem__ #as __getitem__dict [PyObject] #try PyObject)
(__len__ [] int)
(getType [] PyType))
(def: (tuple lux-object host-object)
(-> (-> PyObject (Error Any)) PyObject (Error Any))
(let [size (:coerce Nat (PyObject::__len__ [] host-object))]
(loop [idx +0
output (:coerce (Array Any) (array.new size))]
(if (n/< size idx)
(case (PyObject::__getitem__ [(:coerce Int idx)] host-object)
(#e.Error error)
(#e.Error error)
(#e.Success value)
(case (lux-object value)
(#e.Error error)
(#e.Error error)
(#e.Success lux-value)
(recur (inc idx) (array.write idx lux-value output))))
(#e.Success output)))))
(def: python-type
(-> PyObject Text)
(|>> (PyObject::getType []) (PyType::getName []) (:coerce Text)))
(def: tag-field (PyString::new [//.variant-tag-field]))
(def: flag-field (PyString::new [//.variant-flag-field]))
(def: value-field (PyString::new [//.variant-value-field]))
(def: (variant lux-object host-object)
(-> (-> PyObject (Error Any)) PyObject (Error Any))
(case [(PyObject::__getitem__dict [tag-field] host-object)
(PyObject::__getitem__dict [flag-field] host-object)
(PyObject::__getitem__dict [value-field] host-object)]
(^or [(#e.Error error) _ _] [_ (#e.Error error) _] [_ _ (#e.Error error)])
(#e.Error error)
(^multi [(#e.Success tag) (#e.Success flag) (#e.Success value)]
[(lux-object tag)
(#e.Success tag)]
[(lux-object value)
(#e.Success value)])
(#e.Success [(Long::intValue [] (:coerce Long tag))
(: Any
(case (python-type (:coerce PyObject flag))
"NoneType"
(host.null)
_
""))
value])
_
(ex.throw Not-A-Variant (Object::toString [] host-object))))
(def: (lux-object host-object)
(-> PyObject (Error Any))
(case (python-type host-object)
"str"
(#e.Success (PyObject::asString [] host-object))
"bool"
(#e.Success (PyObject::__nonzero__ [] host-object))
"float"
(#e.Success (PyObject::asDouble [] host-object))
(^or "int" "long")
(#e.Success (PyObject::asLong [] host-object))
"tuple"
(tuple lux-object host-object)
"dict"
(variant lux-object host-object)
"NoneType"
(#e.Success [])
type
(ex.throw Unknown-Kind-Of-Host-Object (format type " " (Object::toString [] host-object)))))
(def: #export (eval code)
(-> Expression (Meta Any))
(function (_ compiler)
(let [interpreter (|> compiler (get@ #.host) (:coerce //.Host) (get@ #//.interpreter))]
(case (interpreter code)
(#e.Error error)
(exec (log! (format "eval #e.Error\n"
"<< " (python.expression code) "\n"
error))
((lang.throw Cannot-Evaluate error) compiler))
(#e.Success output)
(case (lux-object output)
(#e.Success parsed-output)
(exec ## (log! (format "eval #e.Success\n"
## "<< " (python.expression code)))
(#e.Success [compiler parsed-output]))
(#e.Error error)
(exec (log! (format "eval #e.Error\n"
"<< " (python.expression code) "\n"
error))
((lang.throw Cannot-Evaluate error) compiler)))))))
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