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(.module: {#.doc "Commons syntax readers."}
lux
(lux (control monad
["p" parser "p/" Monad<Parser>])
(data (coll [list])
[ident "ident/" Eq<Ident>]
[product]
[maybe])
[macro]
(macro ["s" syntax #+ syntax: Syntax]))
[// #*])
## Exports
(def: #export export
(Syntax Bool)
(p.either (p.after (s.this (' #export)) (p/wrap true))
(p/wrap false)))
## Declarations
(def: #export declaration
{#.doc (doc "A reader for declaration syntax."
"Such as:"
quux
(foo bar baz))}
(Syntax Declaration)
(p.either (p.seq s.local-symbol
(p/wrap (list)))
(s.form (p.seq s.local-symbol
(p.many s.local-symbol)))))
## Annotations
(def: #export annotations
{#.doc "Reader for the common annotations syntax used by def: statements."}
(Syntax Annotations)
(s.record (p.some (p.seq s.tag s.any))))
## Definitions
(def: check^
(Syntax [(Maybe Code) Code])
(p.either (s.form (do p.Monad<Parser>
[_ (s.this (' "lux check"))
type s.any
value s.any]
(wrap [(#.Some type) value])))
(p.seq (p/wrap #.None)
s.any)))
(def: _definition-anns-tag^
(Syntax Ident)
(s.tuple (p.seq s.text s.text)))
(def: (_definition-anns^ _)
(-> Top (Syntax Annotations))
(p.alt (s.this (' #.Nil))
(s.form (do p.Monad<Parser>
[_ (s.this (' #.Cons))
[head tail] (p.seq (s.tuple (p.seq _definition-anns-tag^ s.any))
(_definition-anns^ []))]
(wrap [head tail])))
))
(def: (flat-list^ _)
(-> Top (Syntax (List Code)))
(p.either (do p.Monad<Parser>
[_ (s.this (' #.Nil))]
(wrap (list)))
(s.form (do p.Monad<Parser>
[_ (s.this (' #.Cons))
[head tail] (s.tuple (p.seq s.any s.any))
tail (s.local (list tail) (flat-list^ []))]
(wrap (#.Cons head tail))))))
(do-template [<name> <type> <tag> <then>]
[(def: <name>
(Syntax <type>)
(<| s.tuple
(p.after s.any)
s.form
(do p.Monad<Parser>
[_ (s.this (' <tag>))]
<then>)))]
[tuple-meta^ (List Code) #.Tuple (flat-list^ [])]
[text-meta^ Text #.Text s.text]
)
(def: (find-definition-args meta-data)
(-> (List [Ident Code]) (List Text))
(<| (maybe.default (list))
(case (list.find (|>> product.left (ident/= ["lux" "func-args"])) meta-data)
(^multi (#.Some [_ value])
[(p.run (list value) tuple-meta^)
(#.Right [_ args])]
[(p.run args (p.some text-meta^))
(#.Right [_ args])])
(#.Some args)
_
#.None)
))
(def: #export (definition compiler)
{#.doc "A reader that first macro-expands and then analyses the input Code, to ensure it's a definition."}
(-> Compiler (Syntax Definition))
(do p.Monad<Parser>
[definition-raw s.any
me-definition-raw (s.on compiler
(macro.expand-all definition-raw))]
(s.local me-definition-raw
(s.form (do @
[_ (s.this (' "lux def"))
definition-name s.local-symbol
[?definition-type definition-value] check^
definition-anns s.any
definition-anns (s.local (list definition-anns)
(_definition-anns^ []))
#let [definition-args (find-definition-args definition-anns)]]
(wrap {#//.definition-name definition-name
#//.definition-type ?definition-type
#//.definition-anns definition-anns
#//.definition-value definition-value
#//.definition-args definition-args}))))))
(def: #export (typed-definition compiler)
{#.doc "A reader for definitions that ensures the input syntax is typed."}
(-> Compiler (Syntax Definition))
(do p.Monad<Parser>
[_definition (definition compiler)
_ (case (get@ #//.definition-type _definition)
(#.Some _)
(wrap [])
#.None
(p.fail "Typed definition must have a type!")
)]
(wrap _definition)))
(def: #export typed-input
{#.doc "Reader for the common typed-argument syntax used by many macros."}
(Syntax [Text Code])
(s.tuple (p.seq s.local-symbol s.any)))
(def: #export type-variables
{#.doc "Reader for the common type var/param used by many macros."}
(Syntax (List Text))
(s.tuple (p.some s.local-symbol)))
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