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(.module:
[lux #*
[control
[monad (#+ do)]
["." exception (#+ exception:)]]
[data
["." product]
["." error (#+ Error)]
["." name ("#;." equivalence)]
["." text
format]
[collection
["." row (#+ Row)]
["." dictionary (#+ Dictionary)]]]
[world
[file (#+ Path)]]]
["." //
["." extension]
[//
[synthesis (#+ Synthesis)]]])
(exception: #export (cannot-interpret {error Text})
(exception.report
["Error" error]))
(exception: #export (unknown-lux-name {name Name})
(exception.report
["Name" (%name name)]))
(exception: #export (cannot-overwrite-lux-name {lux-name Name}
{old-host-name Text}
{new-host-name Text})
(exception.report
["Lux Name" (%name lux-name)]
["Old Host Name" old-host-name]
["New Host Name" new-host-name]))
(do-template [<name>]
[(exception: #export (<name> {name Name})
(exception.report
["Output" (%name name)]))]
[cannot-overwrite-output]
[no-buffer-for-saving-code]
)
(type: #export Context
{#scope-name Text
#inner-functions Nat})
(signature: #export (Host expression statement)
(: (-> Text expression (Error Any))
evaluate!)
(: (-> Text statement (Error Any))
execute!)
(: (-> Name expression (Error [Text Any statement]))
define!))
(type: #export (Buffer statement) (Row [Name statement]))
(type: #export (Output statement) (Dictionary Path (Buffer statement)))
(type: #export (State anchor expression statement)
{#context Context
#anchor (Maybe anchor)
#host (Host expression statement)
#buffer (Maybe (Buffer statement))
#output (Output statement)
#counter Nat
#name-cache (Dictionary Name Text)})
(do-template [<special> <general>]
[(type: #export (<special> anchor expression statement)
(<general> (State anchor expression statement) Synthesis expression))]
[State+ extension.State]
[Operation extension.Operation]
[Phase extension.Phase]
[Handler extension.Handler]
[Bundle extension.Bundle]
)
(def: #export (state host)
(All [anchor expression statement]
(-> (Host expression statement)
(..State anchor expression statement)))
{#context {#scope-name ""
#inner-functions 0}
#anchor #.None
#host host
#buffer #.None
#output (dictionary.new text.hash)
#counter 0
#name-cache (dictionary.new name.hash)})
(def: #export (with-context expr)
(All [anchor expression statement output]
(-> (Operation anchor expression statement output)
(Operation anchor expression statement [Text output])))
(function (_ [bundle state])
(let [[old-scope old-inner] (get@ #context state)
new-scope (format old-scope "c" (%n old-inner))]
(case (expr [bundle (set@ #context [new-scope 0] state)])
(#error.Success [[bundle' state'] output])
(#error.Success [[bundle' (set@ #context [old-scope (inc old-inner)] state')]
[new-scope output]])
(#error.Failure error)
(#error.Failure error)))))
(def: #export context
(All [anchor expression statement]
(Operation anchor expression statement Text))
(extension.read (|>> (get@ #context)
(get@ #scope-name))))
(def: #export empty-buffer Buffer row.empty)
(do-template [<tag>
<with-declaration> <with-type> <with-value>
<set> <get> <get-type> <exception>]
[(exception: #export <exception>)
(def: #export <with-declaration>
(All [anchor expression statement output] <with-type>)
(function (_ body)
(function (_ [bundle state])
(case (body [bundle (set@ <tag> (#.Some <with-value>) state)])
(#error.Success [[bundle' state'] output])
(#error.Success [[bundle' (set@ <tag> (get@ <tag> state) state')]
output])
(#error.Failure error)
(#error.Failure error)))))
(def: #export <get>
(All [anchor expression statement]
(Operation anchor expression statement <get-type>))
(function (_ (^@ stateE [bundle state]))
(case (get@ <tag> state)
(#.Some output)
(#error.Success [stateE output])
#.None
(exception.throw <exception> []))))
(def: #export (<set> value)
(All [anchor expression statement]
(-> <get-type> (Operation anchor expression statement Any)))
(function (_ [bundle state])
(#error.Success [[bundle (set@ <tag> (#.Some value) state)]
[]])))]
[#anchor
(with-anchor anchor)
(-> anchor (Operation anchor expression statement output)
(Operation anchor expression statement output))
anchor
set-anchor anchor anchor no-anchor]
[#buffer
with-buffer
(-> (Operation anchor expression statement output)
(Operation anchor expression statement output))
..empty-buffer
set-buffer buffer (Buffer statement) no-active-buffer]
)
(def: #export output
(All [anchor expression statement]
(Operation anchor expression statement (Output statement)))
(extension.read (get@ #output)))
(def: #export next
(All [anchor expression statement]
(Operation anchor expression statement Nat))
(do //.monad
[count (extension.read (get@ #counter))
_ (extension.update (update@ #counter inc))]
(wrap count)))
(do-template [<name> <inputT>]
[(def: #export (<name> label code)
(All [anchor expression statement]
(-> Text <inputT> (Operation anchor expression statement Any)))
(function (_ (^@ state+ [bundle state]))
(case (:: (get@ #host state) <name> label code)
(#error.Success output)
(#error.Success [state+ output])
(#error.Failure error)
(exception.throw cannot-interpret error))))]
[evaluate! expression]
[execute! statement]
)
(def: #export (define! name code)
(All [anchor expression statement]
(-> Name expression (Operation anchor expression statement [Text Any statement])))
(function (_ (^@ stateE [bundle state]))
(case (:: (get@ #host state) define! name code)
(#error.Success output)
(#error.Success [stateE output])
(#error.Failure error)
(exception.throw cannot-interpret error))))
(def: #export (save! name code)
(All [anchor expression statement]
(-> Name statement (Operation anchor expression statement Any)))
(do //.monad
[count ..next
_ (execute! (format "save" (%n count)) code)
?buffer (extension.read (get@ #buffer))]
(case ?buffer
(#.Some buffer)
(if (row.any? (|>> product.left (name;= name)) buffer)
(//.throw cannot-overwrite-output name)
(extension.update (set@ #buffer (#.Some (row.add [name code] buffer)))))
#.None
(//.throw no-buffer-for-saving-code name))))
(def: #export (save-buffer! target)
(All [anchor expression statement]
(-> Path (Operation anchor expression statement Any)))
(do //.monad
[buffer ..buffer]
(extension.update (update@ #output (dictionary.put target buffer)))))
(def: #export (remember lux-name)
(All [anchor expression statement]
(-> Name (Operation anchor expression statement Text)))
(function (_ (^@ stateE [_ state]))
(let [cache (get@ #name-cache state)]
(case (dictionary.get lux-name cache)
(#.Some host-name)
(#error.Success [stateE host-name])
#.None
(exception.throw unknown-lux-name lux-name)))))
(def: #export (learn lux-name host-name)
(All [anchor expression statement]
(-> Name Text (Operation anchor expression statement Any)))
(function (_ [bundle state])
(let [cache (get@ #name-cache state)]
(case (dictionary.get lux-name cache)
#.None
(#error.Success [[bundle
(update@ #name-cache
(dictionary.put lux-name host-name)
state)]
[]])
(#.Some old-host-name)
(exception.throw cannot-overwrite-lux-name [lux-name old-host-name host-name])))))
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