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(;module: {#;doc "Commons syntax readers."}
lux
(lux (control monad
["p" parser])
(data (coll [list])
[ident "ident/" Eq<Ident>]
[product]
[maybe])
[macro]
(macro ["s" syntax #+ syntax: Syntax]))
[.. #*])
## Exports
(def: #export export
{#;doc (doc "A reader for export levels."
"Such as:"
#export
#hidden)}
(Syntax (Maybe Export))
(p;opt (p;alt (s;this (' #export))
(s;this (' #hidden)))))
## 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;Monad<Parser> 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;_lux_:))
type s;any
value s;any]
(wrap [(#;Some type) value])))
(p;seq (:: p;Monad<Parser> 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 (' #lux;Nil))
(s;form (do p;Monad<Parser>
[_ (s;this (' #lux;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 (' #lux;Nil))]
(wrap (list)))
(s;form (do p;Monad<Parser>
[_ (s;this (' #lux;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) #lux;Tuple (flat-list^ [])]
[text-meta^ Text #lux;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;_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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