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(.module:
[library
[lux #*
[abstract
["." monad (#+ do)]]
[data
["." text ("#\." monoid)]
["." name ("#\." codec)]
[collection
["." list ("#\." monoid monad)]]]
[macro
["." code]]
[math
[number
["." nat]
["." int]]]]]
["." // #_
["#" meta
["." location]]])
(def: .public (single_expansion syntax)
(-> Code (Meta (List Code)))
(case syntax
[_ (#.Form (#.Item [[_ (#.Identifier name)] args]))]
(do //.monad
[?macro (//.macro name)]
(case ?macro
(#.Some macro)
((:as Macro' macro) args)
#.None
(\ //.monad in (list syntax))))
_
(\ //.monad in (list syntax))))
(def: .public (expansion syntax)
(-> Code (Meta (List Code)))
(case syntax
[_ (#.Form (#.Item [[_ (#.Identifier name)] args]))]
(do //.monad
[?macro (//.macro name)]
(case ?macro
(#.Some macro)
(do {! //.monad}
[top_level_expansion ((:as Macro' macro) args)]
(|> top_level_expansion
(monad.map //.monad expansion)
(\ ! map list\join)))
#.None
(\ //.monad in (list syntax))))
_
(\ //.monad in (list syntax))))
(def: .public (full_expansion syntax)
(-> Code (Meta (List Code)))
(case syntax
[_ (#.Form (#.Item [[_ (#.Identifier name)] args]))]
(do //.monad
[?macro (//.macro name)]
(case ?macro
(#.Some macro)
(do //.monad
[expansion ((:as Macro' macro) args)
expansion' (monad.map //.monad full_expansion expansion)]
(in (list\join expansion')))
#.None
(do //.monad
[parts' (monad.map //.monad full_expansion (list& (code.identifier name) args))]
(in (list (code.form (list\join parts')))))))
[_ (#.Form (#.Item [harg targs]))]
(do //.monad
[harg+ (full_expansion harg)
targs+ (monad.map //.monad full_expansion targs)]
(in (list (code.form (list\compose harg+ (list\join (: (List (List Code)) targs+)))))))
[_ (#.Tuple members)]
(do //.monad
[members' (monad.map //.monad full_expansion members)]
(in (list (code.tuple (list\join members')))))
[_ (#.Record members)]
(|> members
(monad.map //.monad
(function (_ [left right])
(do //.monad
[left (full_expansion left)
right (full_expansion right)]
(case [left right]
[(#.Item left #.End) (#.Item right #.End)]
(in [left right])
_
(//.failure "Record members must expand into singletons.")))))
(\ //.monad map (|>> code.record list)))
_
(\ //.monad in (list syntax))))
(def: .public (identifier prefix)
(-> Text (Meta Code))
(do //.monad
[id //.seed]
(in (|> id
(\ nat.decimal encoded)
($_ text\compose "__gensym__" prefix)
[""] code.identifier))))
(def: (local_identifier ast)
(-> Code (Meta Text))
(case ast
[_ (#.Identifier [_ name])]
(\ //.monad in name)
_
(//.failure (text\compose "Code is not a local identifier: " (code.format ast)))))
(def: .public wrong_syntax_error
(-> Name Text)
(|>> name\encoded
(text.prefix (text\compose "Wrong syntax for " text.\''))
(text.suffix (text\compose text.\'' "."))))
(macro: .public (with_identifiers tokens)
(case tokens
(^ (list [_ (#.Tuple identifiers)] body))
(do {! //.monad}
[identifier_names (monad.map ! ..local_identifier identifiers)
.let [identifier_defs (list\join (list\map (: (-> Text (List Code))
(function (_ name) (list (code.identifier ["" name]) (` (..identifier (~ (code.text name)))))))
identifier_names))]]
(in (list (` ((~! do) (~! //.monad)
[(~+ identifier_defs)]
(~ body))))))
_
(//.failure (..wrong_syntax_error (name_of ..with_identifiers)))))
(def: .public (one_expansion token)
(-> Code (Meta Code))
(do //.monad
[token+ (..expansion token)]
(case token+
(^ (list token'))
(in token')
_
(//.failure "Macro expanded to more than 1 element."))))
(template [<macro> <func>]
[(macro: .public (<macro> tokens)
(let [[module _] (name_of .._)
[_ short] (name_of <macro>)
macro_name [module short]]
(case (: (Maybe [Bit Code])
(case tokens
(^ (list [_ (#.Tag ["" "omit"])]
token))
(#.Some [#1 token])
(^ (list token))
(#.Some [#0 token])
_
#.None))
(#.Some [omit? token])
(do //.monad
[location //.location
output (<func> token)
.let [_ ("lux io log" ($_ text\compose (name\encoded macro_name) " " (location.format location)))
_ (list\map (|>> code.format "lux io log")
output)
_ ("lux io log" "")]]
(in (if omit?
(list)
output)))
#.None
(//.failure (..wrong_syntax_error macro_name)))))]
[log_single_expansion! ..single_expansion]
[log_expansion! ..expansion]
[log_full_expansion! ..full_expansion]
)
|
