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(.module:
[lux #*
[abstract
["." monad (#+ do)]]
[data
["." text ("#\." monoid)]
["." name ("#\." codec)]
[collection
["." list ("#\." monoid monad)]]]
[macro
["." code]]
[math
[number
["." nat]
["." int]]]]
["." // #_
["#" meta
["." location]]])
(def: #export (expand_once 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 (#.Cons [[_ (#.Identifier name)] args]))]
(do //.monad
[?macro (//.find_macro name)]
(case ?macro
(#.Some macro)
((:coerce Macro' macro) args)
#.None
(\ //.monad wrap (list syntax))))
_
(\ //.monad wrap (list syntax))))
(def: #export (expand 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 (#.Cons [[_ (#.Identifier name)] args]))]
(do //.monad
[?macro (//.find_macro name)]
(case ?macro
(#.Some macro)
(do //.monad
[expansion ((:coerce Macro' macro) args)
expansion' (monad.map //.monad expand expansion)]
(wrap (list\join expansion')))
#.None
(\ //.monad wrap (list syntax))))
_
(\ //.monad wrap (list syntax))))
(def: #export (expand_all syntax)
{#.doc "Expands all macro-calls everywhere recursively, until only primitive/base code remains."}
(-> Code (Meta (List Code)))
(case syntax
[_ (#.Form (#.Cons [[_ (#.Identifier name)] args]))]
(do //.monad
[?macro (//.find_macro name)]
(case ?macro
(#.Some macro)
(do //.monad
[expansion ((:coerce Macro' macro) args)
expansion' (monad.map //.monad expand_all expansion)]
(wrap (list\join expansion')))
#.None
(do //.monad
[parts' (monad.map //.monad expand_all (list& (code.identifier name) args))]
(wrap (list (code.form (list\join parts')))))))
[_ (#.Form (#.Cons [harg targs]))]
(do //.monad
[harg+ (expand_all harg)
targs+ (monad.map //.monad expand_all targs)]
(wrap (list (code.form (list\compose harg+ (list\join (: (List (List Code)) targs+)))))))
[_ (#.Tuple members)]
(do //.monad
[members' (monad.map //.monad expand_all members)]
(wrap (list (code.tuple (list\join members')))))
_
(\ //.monad wrap (list syntax))))
(def: #export (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 //.count]
(wrap (|> id
(\ nat.decimal encode)
($_ text\compose "__gensym__" prefix)
[""] code.identifier))))
(def: (get_local_identifier ast)
(-> Code (Meta Text))
(case ast
[_ (#.Identifier [_ name])]
(\ //.monad wrap name)
_
(//.fail (text\compose "Code is not a local identifier: " (code.format ast)))))
(def: #export wrong_syntax_error
(-> Name Text)
(|>> name\encode
(text\compose "Wrong syntax for ")))
(macro: #export (with_gensyms tokens)
{#.doc (doc "Creates new identifiers and offers them to the body expression."
(syntax: #export (synchronized lock body)
(with_gensyms [g!lock g!body g!_]
(wrap (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))]]
(wrap (list (` ((~! do) (~! //.monad)
[(~+ identifier_defs)]
(~ body))))))
_
(//.fail (..wrong_syntax_error (name_of ..with_gensyms)))))
(def: #export (expand_1 token)
{#.doc "Works just like expand, except that it ensures that the output is a single Code token."}
(-> Code (Meta Code))
(do //.monad
[token+ (..expand token)]
(case token+
(^ (list token'))
(wrap token')
_
(//.fail "Macro expanded to more than 1 element."))))
(template [<macro> <func>]
[(macro: #export (<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" "")]]
(wrap (if omit?
(list)
output)))
#.None
(//.fail (..wrong_syntax_error macro_name)))))]
[log_expand_once! expand_once]
[log_expand! expand]
[log_expand_all! expand_all]
)
|
