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(.module:
lux
(lux (control ["ex" exception #+ exception:]
pipe
[monad #+ do])
(data [bit]
[maybe]
["e" error #+ Error]
[text "text/" Eq<Text>]
text/format
(coll [array]))
[macro]
[io #+ IO Process io]
[host #+ class: interface: object]
(world [file #+ File]))
(luxc [lang]
(lang [".L" variable #+ Register]
(host [python #+ Expression Statement]))
[".C" io]))
(do-template [<name>]
[(exception: #export (<name> {message Text})
message)]
[No-Active-Module-Buffer]
[Cannot-Execute]
[No-Anchor]
)
(host.import java/lang/Object)
(host.import java/lang/String
(getBytes [String] #try (Array byte)))
(host.import java/lang/CharSequence)
(host.import java/lang/Appendable
(append [CharSequence] Appendable))
(host.import java/lang/StringBuilder
(new [])
(toString [] String))
(host.import org/python/core/PyObject)
(host.import org/python/util/PythonInterpreter
(new [])
(exec [String] void)
(eval [String] PyObject))
(type: #export Anchor [Text Register])
(type: #export Host
{#context [Text Nat]
#anchor (Maybe Anchor)
#loader (-> Statement (Error Any))
#interpreter (-> Expression (Error PyObject))
#module-buffer (Maybe StringBuilder)
#program-buffer StringBuilder})
(def: #export init
(IO Host)
(io (let [interpreter (PythonInterpreter::new [])]
{#context ["" +0]
#anchor #.None
#loader (function (_ code)
("lux try" (io (PythonInterpreter::exec [(python.statement code)] interpreter))))
#interpreter (function (_ code)
("lux try" (io (PythonInterpreter::eval [(python.expression code)] interpreter))))
#module-buffer #.None
#program-buffer (StringBuilder::new [])})))
(def: #export python-module-name Text "module.py")
(def: #export init-module-buffer
(Meta Any)
(function (_ compiler)
(#e.Success [(update@ #.host
(|>> (:! Host)
(set@ #module-buffer (#.Some (StringBuilder::new [])))
(:! Nothing))
compiler)
[]])))
(def: #export (with-sub-context expr)
(All [a] (-> (Meta a) (Meta [Text a])))
(function (_ compiler)
(let [old (:! Host (get@ #.host compiler))
[old-name old-sub] (get@ #context old)
new-name (format old-name "___" (%i (nat-to-int old-sub)))]
(case (expr (set@ #.host
(:! Nothing (set@ #context [new-name +0] old))
compiler))
(#e.Success [compiler' output])
(#e.Success [(update@ #.host
(|>> (:! Host)
(set@ #context [old-name (n/inc old-sub)])
(:! Nothing))
compiler')
[new-name output]])
(#e.Error error)
(#e.Error error)))))
(def: #export context
(Meta Text)
(function (_ compiler)
(#e.Success [compiler
(|> (get@ #.host compiler)
(:! Host)
(get@ #context)
(let> [name sub]
name))])))
(def: #export (with-anchor anchor expr)
(All [a] (-> Anchor (Meta a) (Meta a)))
(function (_ compiler)
(let [old (:! Host (get@ #.host compiler))]
(case (expr (set@ #.host
(:! Nothing (set@ #anchor (#.Some anchor) old))
compiler))
(#e.Success [compiler' output])
(#e.Success [(update@ #.host
(|>> (:! Host)
(set@ #anchor (get@ #anchor old))
(:! Nothing))
compiler')
output])
(#e.Error error)
(#e.Error error)))))
(def: #export anchor
(Meta Anchor)
(function (_ compiler)
(case (|> compiler (get@ #.host) (:! Host) (get@ #anchor))
(#.Some anchor)
(#e.Success [compiler anchor])
#.None
((lang.throw No-Anchor "") compiler))))
(def: #export module-buffer
(Meta StringBuilder)
(function (_ compiler)
(case (|> compiler (get@ #.host) (:! Host) (get@ #module-buffer))
#.None
((lang.throw No-Active-Module-Buffer "") compiler)
(#.Some module-buffer)
(#e.Success [compiler module-buffer]))))
(def: #export program-buffer
(Meta StringBuilder)
(function (_ compiler)
(#e.Success [compiler (|> compiler (get@ #.host) (:! Host) (get@ #program-buffer))])))
(do-template [<name> <field> <inputT> <outputT>]
[(def: (<name> code)
(-> <inputT> (Meta <outputT>))
(function (_ compiler)
(let [runner (|> compiler (get@ #.host) (:! Host) (get@ <field>))]
(case (runner code)
(#e.Error error)
((lang.throw Cannot-Execute error) compiler)
(#e.Success output)
(#e.Success [compiler output])))))]
[load! #loader Statement Any]
[interpret #interpreter Expression PyObject]
)
(def: #export variant-tag-field "_lux_tag")
(def: #export variant-flag-field "_lux_flag")
(def: #export variant-value-field "_lux_value")
(def: #export unit Text "")
(def: #export (definition-name [module name])
(-> Ident Text)
(lang.normalize-name (format module "$" name)))
(do-template [<name> <eval> <un-wrap> <inputT> <outputT>]
[(def: #export (<name> code)
(-> <inputT> (Meta <outputT>))
(do macro.Monad<Meta>
[module-buffer module-buffer
#let [_ (Appendable::append [(:! CharSequence (<un-wrap> code))]
module-buffer)]]
(<eval> code)))]
[save load! python.statement Statement Any]
[run interpret python.expression Expression PyObject]
)
(def: #export (save-module! target)
(-> File (Meta (Process Any)))
(do macro.Monad<Meta>
[module macro.current-module-name
module-buffer module-buffer
program-buffer program-buffer
#let [module-code (StringBuilder::toString [] module-buffer)
_ (Appendable::append [(:! CharSequence (format module-code "\n"))]
program-buffer)]]
(wrap (ioC.write target
(format (lang.normalize-name module) "/" python-module-name)
(|> module-code
(String::getBytes ["UTF-8"])
e.assume)))))
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