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(.using
[library
[lux (.except local symbol)
[abstract
["[0]" monad (.only do)]]
[data
["[0]" text ("[1]#[0]" monoid)]
[collection
["[0]" list ("[1]#[0]" monoid monad)]]]
[math
[number
["[0]" nat]
["[0]" int]]]]]
[/
["[0]" code]
["[0]" // "_"
["[1]" meta
["[0]" location]
["[0]" symbol ("[1]#[0]" codec)]]]])
(def: .public (single_expansion syntax)
(-> Code (Meta (List Code)))
(case syntax
[_ {.#Form {.#Item [[_ {.#Symbol 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 [[_ {.#Symbol name}] args]}}]
(do //.monad
[?macro (//.macro name)]
(case ?macro
{.#Some macro}
(do [! //.monad]
[top_level_expansion ((as Macro' macro) args)]
(|> top_level_expansion
(monad.each //.monad expansion)
(# ! each list#conjoint)))
{.#None}
(# //.monad in (list syntax))))
_
(# //.monad in (list syntax))))
(def: .public (full_expansion syntax)
(-> Code (Meta (List Code)))
(case syntax
[_ {.#Form {.#Item [[_ {.#Symbol name}] args]}}]
(do //.monad
[?macro (//.macro name)]
(case ?macro
{.#Some macro}
(do //.monad
[expansion ((as Macro' macro) args)
expansion' (monad.each //.monad full_expansion expansion)]
(in (list#conjoint expansion')))
{.#None}
(do //.monad
[parts' (monad.each //.monad full_expansion (partial_list (code.symbol name) args))]
(in (list (code.form (list#conjoint parts')))))))
[_ {.#Form {.#Item [harg targs]}}]
(do //.monad
[harg+ (full_expansion harg)
targs+ (monad.each //.monad full_expansion targs)]
(in (list (code.form (list#composite harg+ (list#conjoint (is (List (List Code)) targs+)))))))
[_ {.#Variant members}]
(do //.monad
[members' (monad.each //.monad full_expansion members)]
(in (list (code.variant (list#conjoint members')))))
[_ {.#Tuple members}]
(do //.monad
[members' (monad.each //.monad full_expansion members)]
(in (list (code.tuple (list#conjoint members')))))
_
(# //.monad in (list syntax))))
(def: .public (symbol prefix)
(-> Text (Meta Code))
(do //.monad
[id //.seed]
(in (|> id
(# nat.decimal encoded)
(all text#composite "__gensym__" prefix)
[""] code.symbol))))
(def: (local ast)
(-> Code (Meta Text))
(case ast
[_ {.#Symbol [_ name]}]
(# //.monad in name)
_
(//.failure (text#composite "Code is not a local symbol: " (code.format ast)))))
(def: .public wrong_syntax_error
(-> Symbol Text)
(|>> symbol#encoded
(text.prefix (text#composite "Wrong syntax for " text.\''))
(text.suffix (text#composite text.\'' "."))))
(macro: .public (with_symbols tokens)
(case tokens
(pattern (list [_ {.#Tuple symbols}] body))
(do [! //.monad]
[symbol_names (monad.each ! ..local symbols)
.let [symbol_defs (list#conjoint (list#each (is (-> Text (List Code))
(function (_ name) (list (code.symbol ["" name]) (` (..symbol (~ (code.text name)))))))
symbol_names))]]
(in (list (` ((~! do) (~! //.monad)
[(~+ symbol_defs)]
(~ body))))))
_
(//.failure (..wrong_syntax_error (.symbol ..with_symbols)))))
(def: .public (one_expansion token)
(-> Code (Meta Code))
(do //.monad
[token+ (..expansion token)]
(case token+
(pattern (list token'))
(in token')
_
(//.failure "Macro expanded to more than 1 element."))))
(template [<macro> <func>]
[(macro: .public (<macro> tokens)
(let [[module _] (.symbol .._)
[_ short] (.symbol <macro>)
macro_name [module short]]
(case (is (Maybe [Bit Code])
(case tokens
(pattern (list [_ {.#Text "omit"}]
token))
{.#Some [#1 token]}
(pattern (list token))
{.#Some [#0 token]}
_
{.#None}))
{.#Some [omit? token]}
(do //.monad
[location //.location
output (<func> token)
.let [_ ("lux io log" (all text#composite (symbol#encoded macro_name) " " (location.format location)))
_ (list#each (|>> 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]
)
(macro: .public (times tokens)
(case tokens
(pattern (partial_list [_ {.#Nat times}] terms))
(loop (again [times times
before terms])
(case times
0
(# //.monad in before)
_
(do [! //.monad]
[after (|> before
(monad.each ! ..single_expansion)
(# ! each list#conjoint))]
(again (-- times) after))))
_
(//.failure (..wrong_syntax_error (.symbol ..times)))))
(macro: .public (final it)
(let [! //.monad]
(# ! each list#conjoint (monad.each ! ..expansion it))))
|
