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|
... https://en.wikipedia.org/wiki/Row_polymorphism
(.require
[library
[lux (.except Slot macro type the has revised)
[abstract
["[0]" monad (.only do)]]
[control
["?" parser (.use "[1]#[0]" monad)]
["[0]" maybe (.use "[1]#[0]" monad)]
["[0]" exception (.only Exception)]]
[data
["[0]" product]
["[0]" text (.only)
["%" \\format]]
[collection
["[0]" list (.use "[1]#[0]" monad mix)]
["[0]" dictionary (.only Dictionary)]
["[0]" set]]]
[math
[number
["n" nat]]]
["[0]" meta (.only)
["[0]" symbol]
["[0]" type]
["[0]" code (.only)
["?[1]" \\parser (.only Parser)]]
["[0]" macro (.only with_symbols)
["[0]" vocabulary]
[syntax (.only syntax)
["[0]" export]]]]]])
(vocabulary.def
[.public Slot]
[.public slot]
[.private macro]
[.private by_name])
(.type .public (Row content extra)
(Record
[#content content
#extra extra]))
(def declaration
(Parser [Text (List Text)])
(all ?.either
(?.and ?code.local (?#in (list)))
(?code.form (?.and ?code.local (?.some ?code.local)))
))
(def un_paired
(All (_ value)
(-> (List [value value])
(List value)))
(|>> (list#each (function (_ [left right])
(list left right)))
list#conjoint))
(def record
(Parser (List [Text Code]))
(?code.tuple (?.many (?.and ?code.local ?code.any))))
(def super
(Parser Code)
?code.any)
(def definition
(Parser [(Maybe Code) (List [Text Code])])
(all ?.either
(?.and (?#in {.#None}) ..record)
(?.and (?#each maybe#in ..super) ..record)
))
(def row_module (symbol.module (symbol ..Row)))
(def row_short (symbol.short (symbol ..Row)))
(def (nesting it)
(-> Type Nat)
(when it
{.#Named _ it}
(nesting it)
{.#ExQ (list) un_quantified}
(when (type.flat_application un_quantified)
[{.#Named [..row_module ..row_short] _} _]
1
[super _]
(++ (nesting super)))
_
0))
(exception.def .public (cannot_repeat_slot_names slots)
(Exception (List Text))
(exception.report
(list ["Slots" (exception.listing %.text slots)])))
(def (unique_slots? it)
(-> (List Text) Bit)
(|> it
(set.of_list text.hash)
set.size
(n.= (list.size it))))
(def .public type
(syntax (_ [[export_policy [name parameters]] (export.with ..declaration)
[super slots] ..definition])
(let [slot_names (list#each product.left slots)]
(if (unique_slots? slot_names)
(do [! meta.monad]
[.let [parameters (list#each code.local parameters)]
name' (macro.symbol name)
slots' (monad.each ! (function (_ [slot type])
(do !
[slot' (macro.symbol slot)]
(in [slot' type])))
slots)
:super: (when super
{.#Some super}
(do !
[super (meta.eval Type
(` (type_literal (, super))))]
(in {.#Some (as Type super)}))
_
(in {.#None}))]
(with_symbols [g!_ g!&]
(let [self (` (Row ((, name') (,* parameters))
(, g!&)))]
(in (list.partial (` (.type (, export_policy) ((, name') (,* parameters))
(Record
[(,* (un_paired slots'))])))
(` (.type (, export_policy) ((, (code.local name)) (,* parameters))
(Ex ((, g!_) (, g!&))
(, (when super
{.#Some super}
(` ((, super) (, self)))
_
self)))))
(list#each (function (_ [[row_slot _] [record_slot _]])
(` (def (, export_policy) (, (code.local row_slot))
(..slot
(syntax ((, g!_) [])
(of meta.monad (,' in)
(list (,* (list.repeated (|> :super:
(maybe#each nesting)
(maybe.else 0))
(` (` ..#extra))))
(` ..#content)
(` (, record_slot)))))))))
(list.zipped_2 slots slots'))
)))))
(meta.of_try (exception.except ..cannot_repeat_slot_names [slot_names]))))))
(def .public the
(syntax (_ [slot ?code.symbol
row ?code.any])
(do meta.monad
[slot (by_name slot)
path ((macro.function slot) (list))]
(in (list (` (.the [(,* path)] (, row))))))))
(def .public has
(syntax (_ [slot ?code.symbol
value ?code.any
row ?code.any])
(do meta.monad
[slot (by_name slot)
path ((macro.function slot) (list))]
(in (list (` (.has [(,* path)] (, value) (, row))))))))
(def .public revised
(syntax (_ [slot ?code.symbol
revision ?code.any
row ?code.any])
(do meta.monad
[slot (by_name slot)
path ((macro.function slot) (list))]
(in (list (` (.revised [(,* path)] (, revision) (, row))))))))
(exception.def .public (missing_level it)
(Exception Nat)
(exception.report
(list ["Level" (%.nat it)])))
(def .public row
(syntax (_ [slots (?code.tuple (?.many (?.and ?code.symbol ?code.any)))])
(do [! meta.monad]
[record (monad.each ! (function (_ [slot value])
(do !
[slot (by_name slot)
path ((macro.function slot) (list))
.let [nesting (n.- 2 (list.size path))
slot (maybe.trusted (list.last path))]]
(in [nesting [slot value]])))
slots)
.let [levels (list#mix (function (_ [nesting slot,value] levels)
(dictionary.revised' nesting
(list)
(|>> (list.partial slot,value))
levels))
(is (Dictionary Nat (List [Code Code]))
(dictionary.empty n.hash))
record)]
row (monad.mix ! (function (_ level extra)
(when (dictionary.value level levels)
{.#Some record}
(in (` [..#content [(,* (un_paired record))]
..#extra (, extra)]))
{.#None}
(meta.of_try (exception.except ..missing_level [level]))))
(` [])
(|> (dictionary.size levels)
list.indices
list.reversed))]
(in (list row)))))
|
