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(.module:
[library
[lux (#- let local)
["." 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: .public (spliced [parts (<code>.tuple (<>.some <code>.any))])
(in parts))
(syntax: .public (amount [parts (<code>.tuple (<>.some <code>.any))])
(in (list (code.nat (list.size parts)))))
(syntax: .public (with_locals [locals (<code>.tuple (<>.some <code>.local_identifier))
body <code>.any])
(do {! meta.monad}
[g!locals (|> locals
(list\map //.identifier)
(monad.all !))]
(in (list (` (.with_expansions [(~+ (|> (list.zipped/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]
(in (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\encoded <code>.bit)
(<>\map nat\encoded <code>.nat)
(<>\map int\encoded <code>.int)
(<>\map rev\encoded <code>.rev)
(<>\map frac\encoded <code>.frac)
)))
(def: (part module_side?)
(-> Bit (Parser (List Text)))
(<code>.tuple (<>.many (..snippet module_side?))))
(syntax: .public (text [simple (..part false)])
(in (list (|> simple (text.interposed "") code.text))))
(template [<name> <simple> <complex>]
[(syntax: .public (<name> [name (<>.or (<>.and (..part true) (..part false))
(..part false))])
(case name
(#.Left [simple complex])
(in (list (<complex> [(text.interposed "" simple)
(text.interposed "" complex)])))
(#.Right simple)
(in (list (|> simple (text.interposed "") <simple>)))))]
[identifier code.local_identifier code.identifier]
[tag code.local_tag code.tag]
)
(type: Environment
(Dictionary Text Code))
(def: (applied env template)
(-> Environment Code Code)
(case template
[_ (#.Identifier "" name)]
(case (dictionary.value name env)
(#.Some substitute)
substitute
#.None
template)
(^template [<tag>]
[[meta (<tag> elems)]
[meta (<tag> (list\map (applied env) elems))]])
([#.Tuple]
[#.Form])
[meta (#.Record members)]
[meta (#.Record (list\map (: (-> [Code Code] [Code Code])
(function (_ [key value])
[(applied env key)
(applied env value)]))
members))]
_
template))
(type: Local
{#name Text
#parameters (List Text)
#template (List Code)})
(exception: .public (irregular_arguments {expected Nat} {actual Nat})
(exception.report
["Expected" (\ nat.decimal encoded expected)]
["Actual" (\ nat.decimal encoded actual)]))
(def: (macro (^slots [#parameters #template]))
(-> Local Macro)
("lux macro"
(function (_ inputs compiler)
(.let [parameters_amount (list.size parameters)
inputs_amount (list.size inputs)]
(if (nat.= parameters_amount inputs_amount)
(.let [environment (: Environment
(|> (list.zipped/2 parameters inputs)
(dictionary.of_list text.hash)))]
(#.Right [compiler (list\map (..applied environment) template)]))
(exception.except ..irregular_arguments [parameters_amount inputs_amount]))))))
(def: local
(Parser Local)
(do <>.monad
[[name parameters] (<code>.form (<>.and <code>.local_identifier
(<>.many <code>.local_identifier)))
template (<code>.tuple (<>.some <code>.any))]
(in {#name name
#parameters parameters
#template template})))
(syntax: .public (let [locals (<code>.tuple (<>.some ..local))
body <code>.any])
(do meta.monad
[here_name meta.current_module_name
expression? (: (Meta Bit)
(function (_ lux)
(#try.Success [lux (case (value@ #.expected lux)
#.None
false
(#.Some _)
true)])))
g!pop (local.push (list\map (function (_ local)
[[here_name (value@ #name local)]
(..macro local)])
locals))]
(if expression?
(//.with_identifiers [g!body]
(in (list (` (.let [(~ g!body) (~ body)]
(exec (~ g!pop)
(~ g!body)))))))
(in (list body
g!pop)))))
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