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(.module:
[lux (#- Definition)
["." meta]
[abstract
[equivalence (#+ Equivalence)]
[monad (#+ do)]]
[control
["." exception (#+ exception:)]
["<>" parser
["<.>" code (#+ Parser)]]]
[data
["." sum]
["." product]
["." bit]
["." name]
["." text
["%" format (#+ format)]]
[collection
["." list]]]
[macro
["." code]]
[meta
["." location]]]
["." // (#+ Annotations)
["#." check (#+ Check)]])
(type: #export Definition
{#name Text
#value (Either Check
Code)
#anns Annotations
#export? Bit})
(def: #export equivalence
(Equivalence Definition)
($_ product.equivalence
text.equivalence
($_ sum.equivalence
//check.equivalence
code.equivalence
)
(list.equivalence (product.equivalence name.equivalence
code.equivalence))
bit.equivalence
))
(def: extension
"lux def")
(def: (write_tag [module short])
(-> Name Code)
(` [(~ (code.text module))
(~ (code.text short))]))
(def: (write_annotations value)
(-> Annotations Code)
(case value
#.Nil
(` #.Nil)
(#.Cons [name value] tail)
(` (#.Cons [(~ (..write_tag name))
(~ value)]
(~ (write_annotations tail))))))
(def: dummy
Code
(` {#.module (~ (code.text (get@ #.module location.dummy)))
#.line (~ (code.nat (get@ #.line location.dummy)))
#.column (~ (code.nat (get@ #.column location.dummy)))}))
(def: #export (write (^slots [#name #value #anns #export?]))
(-> Definition Code)
(` ((~ (code.text ..extension))
(~ (code.local_identifier name))
(~ (case value
(#.Left check)
(//check.write check)
(#.Right value)
value))
[(~ ..dummy) (#.Record (~ (..write_annotations anns)))]
(~ (code.bit export?)))))
(def: tag_parser
(Parser Name)
(<code>.tuple (<>.and <code>.text <code>.text)))
(def: annotations_parser
(Parser Annotations)
(<>.rec
(function (_ recur)
($_ <>.or
(<code>.tag! (name_of #.Nil))
(<code>.form (do <>.monad
[_ (<code>.tag! (name_of #.Cons))
[head tail] (<>.and (<code>.tuple (<>.and tag_parser <code>.any))
recur)]
(wrap [head tail])))
))))
(def: #export (parser compiler)
{#.doc "A reader that first macro-expands and then analyses the input Code, to ensure it's a definition."}
(-> Lux (Parser Definition))
(do {! <>.monad}
[raw <code>.any
me_raw (|> raw
meta.expand_all
(meta.run compiler)
<>.lift)]
(<| (<code>.local me_raw)
<code>.form
(<>.after (<code>.text! ..extension))
($_ <>.and
<code>.local_identifier
(<>.or //check.parser
<code>.any)
(<| <code>.tuple
(<>.after <code>.any)
<code>.form
(<>.after (<code>.this! (` #.Record)))
..annotations_parser)
<code>.bit
))))
(exception: #export (lacks_type! {definition Definition})
(exception.report
["Definition" (%.code (..write definition))]))
(def: #export (typed compiler)
{#.doc "Only works for typed definitions."}
(-> Lux (Parser Definition))
(do <>.monad
[definition (..parser compiler)
_ (case (get@ #value definition)
(#.Left _)
(wrap [])
(#.Right _)
(<>.lift (exception.throw ..lacks_type! [definition])))]
(wrap definition)))
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