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(.module:
[lux #*
[abstract
["." equivalence (#+ Equivalence)]
[monad (#+ do)]]
[control
["." state (#+ State)]
["." exception (#+ exception:)]]
[data
["." error (#+ Error)]
["." text ("#;." equivalence)
["%" format]]
[format
["." binary (#+ Format)]]
[collection
["." list ("#;." fold)]
["." row (#+ Row)]]]
[type
abstract]]
["." // (#+ UTF8 Class Constant) ("#;." class-equivalence)
[//
["." encoding]
["." index (#+ Index)]
["." descriptor (#+ Descriptor)]]])
(def: offset 1)
(type: #export Pool (Row Constant))
(def: #export equivalence
(Equivalence Pool)
(row.equivalence //.equivalence))
(template: (!add <tag> <=> <value>)
(function (_ pool)
(with-expansions [<index> (as-is (index.index (encoding.to-u2 (n/+ offset idx))))
<try-again> (as-is (recur (.inc idx)))]
(loop [idx 0]
(case (row.nth idx pool)
(#.Some entry)
(case entry
(<tag> reference)
(if (<=> reference <value>)
[pool
<index>]
<try-again>)
_
<try-again>)
#.None
[(row.add (<tag> <value>) pool)
<index>])))))
(template: (!raw-index <index>)
(|> <index> index.number encoding.from-u2 .nat))
(exception: #export (invalid-index {index (Index Any)}
{maximum Nat})
(exception.report
["Index" (|> index !raw-index %.nat)]
["Maximum" (%.nat maximum)]))
(exception: #export (invalid-constant {index (Index Any)}
{tag Name})
(exception.report
["Index" (|> index !raw-index %.nat)]
["Expected tag" (%.name tag)]))
(template: (!fetch <tag> <index>)
(function (_ pool)
(case (row.nth (|> <index> !raw-index (n/- offset))
pool)
(#.Some entry)
(case entry
(<tag> value)
[pool (#error.Success value)]
_
[pool (exception.throw ..invalid-constant [<index> (name-of <tag>)])])
#.None
[pool (exception.throw ..invalid-index [<index> (row.size pool)])])))
(exception: #export (cannot-find {tag Name} {value Text})
(exception.report
["Expected tag" (%.name tag)]
["Value" value]))
(template: (!find <tag> <=> <%> <expected>)
(function (_ pool)
(with-expansions [<index> (as-is (index.index (encoding.to-u2 (n/+ offset idx))))
<try-again> (as-is (recur (.inc idx)))]
(loop [idx 0]
(case (row.nth idx pool)
(#.Some entry)
(case entry
(<tag> actual)
(if (<=> actual <expected>)
[pool
(#error.Success <index>)]
<try-again>)
_
<try-again>)
#.None
[pool
(exception.throw ..cannot-find [(name-of <tag>) (<%> <expected>)])])))))
(type: (Adder of)
(-> of (State Pool (Index of))))
(type: (Fetcher of)
(-> (Index of) (State Pool (Error of))))
(type: (Finder of)
(-> of (State Pool (Error (Index of)))))
(def: #export (utf8 value)
(Adder UTF8)
(!add #//.UTF8 text;= value))
(def: #export (fetch-utf8 index)
(Fetcher UTF8)
(!fetch #//.UTF8 index))
(def: #export (find-utf8 reference)
(Finder UTF8)
(!find #//.UTF8 text;= %.text reference))
(def: (class' value)
(Adder Class)
(!add #//.Class //;= value))
(def: #export (class name)
(-> UTF8 (State Pool (Index Class)))
(do state.monad
[@name (utf8 name)]
(class' (//.class @name))))
(def: #export (descriptor value)
(All [kind]
(-> (Descriptor kind)
(State Pool (Index (Descriptor kind)))))
(let [value (descriptor.descriptor value)]
(!add #//.UTF8 text;= value)))
(def: #export format
(Format Pool)
(binary.row/16' ..offset //.format))
(def: #export empty
Pool
row.empty)
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