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## Copyright (c) Eduardo Julian. All rights reserved.
## This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
## If a copy of the MPL was not distributed with this file,
## You can obtain one at http://mozilla.org/MPL/2.0/.
(;module: {#;doc "Commons syntax parsers and generators.
The goal is to be able to reuse common syntax in macro definitions across libraries."}
lux
(lux (control monad)
(data (struct [list])
text/format
[ident "Ident/" Eq<Ident>]
[product])
[compiler]
(macro [ast]
["s" syntax #+ syntax: Syntax])))
## Exports
(type: #export Export-Level
#Exported
#Hidden)
(def: #export export-level
{#;doc (doc "A parser for export levels."
"Such as:"
#export
#hidden)}
(Syntax (Maybe Export-Level))
(s;opt (s;alt (s;sample! (' #export))
(s;sample! (' #hidden)))))
(def: #export (gen-export-level ?el)
(-> (Maybe Export-Level) (List AST))
(case ?el
#;None
(list)
(#;Some #Exported)
(list (' #export))
(#;Some #Hidden)
(list (' #hidden))))
## Declarations
(type: #export Decl
{#decl-name Text
#decl-args (List Text)})
(def: #export decl
{#;doc (doc "A parser for declaration syntax."
"Such as:"
quux
(foo bar baz))}
(Syntax Decl)
(s;either (s;seq s;local-symbol
(:: s;Monad<Syntax> wrap (list)))
(s;form (s;seq s;local-symbol
(s;many s;local-symbol)))))
## Definitions
(type: #export Def-Syntax
{#def-name Text
#def-type (Maybe AST)
#def-value AST
#def-anns (List [Ident AST])
#def-args (List Text)
})
(def: check^
(Syntax [(Maybe AST) AST])
(s;either (s;form (do s;Monad<Syntax>
[_ (s;sample! (' lux;_lux_:))
type s;any
value s;any]
(wrap [(#;Some type) value])))
(s;seq (:: s;Monad<Syntax> wrap #;None)
s;any)))
(def: _def-anns-tag^
(Syntax Ident)
(s;tuple (s;seq s;text s;text)))
(def: (_def-anns^ _)
(-> Top (Syntax (List [Ident AST])))
(s;alt (s;sample! (' #lux;Nil))
(s;form (do s;Monad<Syntax>
[_ (s;sample! (' #lux;Cons))
[head tail] (s;seq (s;tuple (s;seq _def-anns-tag^ s;any))
(_def-anns^ []))]
(wrap [head tail])))
))
(def: (flat-list^ _)
(-> Top (Syntax (List AST)))
(s;either (do s;Monad<Syntax>
[_ (s;sample! (' #lux;Nil))]
(wrap (list)))
(s;form (do s;Monad<Syntax>
[_ (s;sample! (' #lux;Cons))
[head tail] (s;tuple (s;seq s;any s;any))
tail (s;local (list tail) (flat-list^ []))]
(wrap (#;Cons head tail))))))
(def: list-meta^
(Syntax (List AST))
(s;form (do s;Monad<Syntax>
[_ (s;sample! (' #lux;ListM))]
(flat-list^ []))))
(def: text-meta^
(Syntax Text)
(s;form (do s;Monad<Syntax>
[_ (s;sample! (' #lux;TextM))]
s;text)))
(def: (find-def-args meta-data)
(-> (List [Ident AST]) (List Text))
(default (list)
(case (list;find (|>. product;left (Ident/= ["lux" "func-args"])) meta-data)
(^=> (#;Some [_ value])
[(s;run (list value) list-meta^)
(#;Right [_ args])]
[(s;run args (s;some text-meta^))
(#;Right [_ args])])
(#;Some args)
_
#;None)
))
(def: #export (def compiler)
{#;doc "A parser that first macro-expands and then analyses the input AST, to ensure it's a definition."}
(-> Compiler (Syntax Def-Syntax))
(do s;Monad<Syntax>
[def-raw s;any
me-def-raw (s;on compiler
(compiler;macro-expand-all def-raw))]
(s;local me-def-raw
(s;form (do @
[_ (s;sample! (' lux;_lux_def))
def-name s;local-symbol
[?def-type def-value] check^
def-anns s;any
def-anns (s;local (list def-anns)
(_def-anns^ []))
#let [def-args (find-def-args def-anns)]]
(wrap {#def-name def-name
#def-type ?def-type
#def-anns def-anns
#def-value def-value
#def-args def-args}))))))
(def: #export (typed-def compiler)
{#;doc "A parser for definitions that ensures the input syntax is typed."}
(-> Compiler (Syntax Def-Syntax))
(do s;Monad<Syntax>
[_def (def compiler)
_ (case (get@ #def-type _def)
(#;Some _)
(wrap [])
#;None
(s;fail "Typed def must have a type!")
)]
(wrap _def)))
(def: #export def-anns
{#;doc "Parser for the common annotations syntax used by def: statements."}
(Syntax (List [Ident AST]))
(s;record (s;some (s;seq s;tag s;any))))
(def: #export typed-arg
{#;doc "Parser for the common typed-argument syntax used by many macros."}
(Syntax [Text AST])
(s;tuple (s;seq s;local-symbol s;any)))
(def: #export type-params
{#;doc "Parser for the common type var/param used by many macros."}
(Syntax (List Text))
(s;tuple (s;some s;local-symbol)))
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