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(.module:
[lux #*
["." meta]
[abstract
["." monad (#+ do)]]
[control
["." try (#+ Try)]
["." exception (#+ exception:)]
["<>" parser ("#\." functor)
["<.>" code (#+ Parser)]]]
[data
["." bit ("#\." codec)]
["." text]
[collection
["." list ("#\." monad)]
["." dictionary (#+ Dictionary)]]]
[math
[number
["." nat ("#\." decimal)]
["." int ("#\." decimal)]
["." rev ("#\." decimal)]
["." frac ("#\." decimal)]]]]
["." //
[syntax (#+ syntax:)]
["." code]
["." local]])
(syntax: #export (splice {parts (<code>.tuple (<>.some <code>.any))})
(wrap parts))
(syntax: #export (count {parts (<code>.tuple (<>.some <code>.any))})
(wrap (list (code.nat (list.size parts)))))
(syntax: #export (with_locals {locals (<code>.tuple (<>.some <code>.local_identifier))}
body)
(do {! meta.monad}
[g!locals (|> locals
(list\map //.gensym)
(monad.seq !))]
(wrap (list (` (.with_expansions [(~+ (|> (list.zip/2 locals g!locals)
(list\map (function (_ [name identifier])
(list (code.local_identifier name) (as_is identifier))))
list\join))]
(~ body)))))))
(def: (name_side module_side? parser)
(-> Bit (Parser Name) (Parser Text))
(do <>.monad
[[module short] parser]
(wrap (if module_side?
(case module
"" short
_ module)
short))))
(def: (snippet module_side?)
(-> Bit (Parser Text))
(let [full_identifier (..name_side module_side? <code>.identifier)
full_tag (..name_side module_side? <code>.tag)]
($_ <>.either
<code>.text
(if module_side?
full_identifier
(<>.either <code>.local_identifier
full_identifier))
(if module_side?
full_tag
(<>.either <code>.local_tag
full_tag))
(<>\map bit\encode <code>.bit)
(<>\map nat\encode <code>.nat)
(<>\map int\encode <code>.int)
(<>\map rev\encode <code>.rev)
(<>\map frac\encode <code>.frac)
)))
(def: (part module_side?)
(-> Bit (Parser (List Text)))
(<code>.tuple (<>.many (..snippet module_side?))))
(syntax: #export (text {simple (..part false)})
(wrap (list (|> simple (text.join_with "") code.text))))
(template [<name> <simple> <complex>]
[(syntax: #export (<name> {name (<>.or (<>.and (..part true) (..part false))
(..part false))})
(case name
(#.Left [simple complex])
(wrap (list (<complex> [(text.join_with "" simple)
(text.join_with "" complex)])))
(#.Right simple)
(wrap (list (|> simple (text.join_with "") <simple>)))))]
[identifier code.local_identifier code.identifier]
[tag code.local_tag code.tag]
)
(type: Environment
(Dictionary Text Code))
(def: (apply env template)
(-> Environment Code Code)
(case template
[_ (#.Identifier "" name)]
(case (dictionary.get name env)
(#.Some substitute)
substitute
#.None
template)
(^template [<tag>]
[[meta (<tag> elems)]
[meta (<tag> (list\map (apply env) elems))]])
([#.Tuple]
[#.Form])
[meta (#.Record members)]
[meta (#.Record (list\map (: (-> [Code Code] [Code Code])
(function (_ [key value])
[(apply env key)
(apply env value)]))
members))]
_
template))
(type: Local
{#name Text
#parameters (List Text)
#template (List Code)})
(exception: #export (irregular_arguments {expected Nat} {actual Nat})
(exception.report
["Expected" (\ nat.decimal encode expected)]
["Actual" (\ nat.decimal encode actual)]))
(def: (macro (^slots [#parameters #template]))
(-> Local Macro)
("lux macro"
(function (_ inputs compiler)
(let [parameters_count (list.size parameters)
inputs_count (list.size inputs)]
(if (nat.= parameters_count inputs_count)
(let [environment (: Environment
(|> (list.zip/2 parameters inputs)
(dictionary.from_list text.hash)))]
(#.Right [compiler (list\map (..apply environment) template)]))
(exception.throw ..irregular_arguments [parameters_count inputs_count]))))))
(def: local
(Parser Local)
(do <>.monad
[[name parameters] (<code>.form (<>.and <code>.local_identifier
(<>.many <code>.local_identifier)))
template (<code>.tuple (<>.some <code>.any))]
(wrap {#name name
#parameters parameters
#template template})))
(syntax: #export (with {locals (<code>.tuple (<>.some ..local))}
body)
(do meta.monad
[here_name meta.current_module_name
expression? (: (Meta Bit)
(function (_ lux)
(#try.Success [lux (case (get@ #.expected lux)
#.None
false
(#.Some _)
true)])))
g!pop (local.push (list\map (function (_ local)
[[here_name (get@ #name local)]
(..macro local)])
locals))]
(if expression?
(//.with_gensyms [g!body]
(wrap (list (` (let [(~ g!body) (~ body)]
(exec (~ g!pop)
(~ g!body)))))))
(wrap (list body
g!pop)))))
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