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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)
{#.doc (doc "Given code that requires applying a macro, does it once and returns the result."
"Otherwise, returns the code as-is.")}
(-> 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)
{#.doc (doc "Given code that requires applying a macro, expands repeatedly until no more direct macro-calls are left."
"Otherwise, returns the code as-is.")}
(-> 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)
{#.doc "Expands all macro-calls everywhere recursively, until only primitive/base code remains."}
(-> 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 (gensym prefix)
{#.doc (doc "Generates a unique name as an Code node (ready to be used in code templates)."
"A prefix can be given (or just be empty text) to better identify the code for debugging purposes.")}
(-> Text (Meta Code))
(do //.monad
[id //.seed]
(in (|> id
(\ nat.decimal encode)
($_ text\compose "__gensym__" prefix)
[""] code.identifier))))
(def: (get_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\encode
(text\compose "Wrong syntax for ")))
(macro: .public (with_gensyms tokens)
{#.doc (doc "Creates new identifiers and offers them to the body expression."
(syntax: .public (synchronized lock body)
(with_gensyms [g!lock g!body g!_]
(in (list (` (let [(~ g!lock) (~ lock)
(~ g!_) ("jvm monitorenter" (~ g!lock))
(~ g!body) (~ body)
(~ g!_) ("jvm monitorexit" (~ g!lock))]
(~ g!body)))))
)))}
(case tokens
(^ (list [_ (#.Tuple identifiers)] body))
(do {! //.monad}
[identifier_names (monad.map ! ..get_local_identifier identifiers)
.let [identifier_defs (list\join (list\map (: (-> Text (List Code))
(function (_ name) (list (code.identifier ["" name]) (` (gensym (~ (code.text name)))))))
identifier_names))]]
(in (list (` ((~! do) (~! //.monad)
[(~+ identifier_defs)]
(~ body))))))
_
(//.failure (..wrong_syntax_error (name_of ..with_gensyms)))))
(def: .public (one_expansion token)
{#.doc "Works just like expand, except that it ensures that the output is a single Code 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)
{#.doc (doc "Performs a macro-expansion and logs the resulting code."
"You can either use the resulting code, or omit them."
"By omitting them, this macro produces nothing (just like the lux.comment macro)."
(<macro> #omit
(def: (foo bar baz)
(-> Int Int Int)
(int.+ bar baz))))}
(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\encode 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]
)
|
