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(.module:
[lux #*
[control
["ex" exception (#+ exception:)]
[monad (#+ do)]]
[data
["." product]
["." error (#+ Error)]
[name ("name/." Equivalence<Name> Codec<Text,Name>)]
["." text
format]
[collection
["." row (#+ Row)]
["dict" dictionary (#+ Dictionary)]]]
[world
[file (#+ File)]]]
["." //
["." extension]]
[//synthesis (#+ Synthesis)])
(do-template [<name>]
[(exception: #export (<name>)
"")]
[no-active-buffer]
[no-anchor]
)
(exception: #export (cannot-interpret {message Text})
message)
(do-template [<name>]
[(exception: #export (<name> {name Name})
(ex.report ["Artifact" (name/encode name)]))]
[cannot-overwrite-artifact]
[no-buffer-for-saving-code]
)
(type: #export Context
{#scope-name Text
#inner-functions Nat})
(signature: #export (Host expression statement)
(: (-> expression (Error Any))
evaluate!)
(: (-> statement (Error Any))
execute!))
(type: #export (Buffer statement) (Row [Name statement]))
(type: #export (Artifacts statement) (Dictionary File (Buffer statement)))
(type: #export (State anchor expression statement)
{#context Context
#anchor (Maybe anchor)
#host (Host expression statement)
#buffer (Maybe (Buffer statement))
#artifacts (Artifacts statement)
#counter Nat})
(type: #export (Operation anchor expression statement)
(extension.Operation (State anchor expression statement) Synthesis expression))
(type: #export (Phase anchor expression statement)
(extension.Phase (State anchor expression statement) Synthesis expression))
(type: #export (Handler anchor expression statement)
(extension.Handler (State anchor expression statement) Synthesis expression))
(type: #export (Bundle anchor expression statement)
(extension.Bundle (State anchor expression statement) Synthesis expression))
(def: #export (init host)
(All [anchor expression statement]
(-> (Host expression statement)
(..State anchor expression statement)))
{#context {#scope-name ""
#inner-functions +0}
#anchor #.None
#host host
#buffer #.None
#artifacts (dict.new text.Hash<Text>)
#counter +0})
(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___" (%i (.int 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.Error error)
(#error.Error error)))))
(def: #export context
(All [anchor expression statement]
(Operation anchor expression statement Text))
(extension.read (|>> (get@ #context)
(get@ #scope-name))))
(do-template [<tag>
<with-declaration> <with-type> <with-value>
<get> <get-type> <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.Error error)
(#error.Error 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
(ex.throw <exception> []))))]
[#anchor
(with-anchor anchor)
(-> anchor (Operation anchor expression statement output)
(Operation anchor expression statement output))
anchor
anchor anchor no-anchor]
[#buffer
with-buffer
(-> (Operation anchor expression statement output)
(Operation anchor expression statement output))
row.empty
buffer (Buffer statement) no-active-buffer]
)
(def: #export artifacts
(All [anchor expression statement]
(Operation anchor expression statement (Artifacts statement)))
(extension.read (get@ #artifacts)))
(def: #export next
(All [anchor expression statement]
(Operation anchor expression statement Nat))
(do //.Monad<Operation>
[_ (extension.update (update@ #counter inc))]
(extension.read (get@ #counter))))
(do-template [<name> <inputT>]
[(def: #export (<name> code)
(All [anchor expression statement]
(-> <inputT> (Operation anchor expression statement Any)))
(function (_ (^@ stateE [bundle state]))
(case (:: (get@ #host state) <name> code)
(#error.Error error)
(ex.throw cannot-interpret error)
(#error.Success output)
(#error.Success [stateE output]))))]
[evaluate! expression]
[execute! statement]
)
(def: #export (save! name code)
(All [anchor expression statement]
(-> Name statement (Operation anchor expression statement Any)))
(do //.Monad<Operation>
[_ (execute! code)
?buffer (extension.read (get@ #buffer))]
(case ?buffer
(#.Some buffer)
(if (row.any? (|>> product.left (name/= name)) buffer)
(//.throw cannot-overwrite-artifact 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]
(-> File (Operation anchor expression statement Any)))
(do //.Monad<Operation>
[buffer ..buffer]
(extension.update (update@ #artifacts (dict.put target buffer)))))
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