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(.module:
lux
(lux (control [monad #+ do]
["ex" exception #+ exception:])
(data [maybe]
[product]
["e" error]
[text "text/" Eq<Text>]
text/format
(coll [list]))
[macro]
(macro ["s" syntax #+ syntax:])
(lang (type ["tc" check])))
(luxc (lang ["la" analysis])))
(type: #export Eval
(-> Type Code (Meta Top)))
(type: #export Analyser
(-> Code (Meta la.Analysis)))
(def: #export version Text "0.6.0")
(def: #export (fail message)
(All [a] (-> Text (Meta a)))
(do macro.Monad<Meta>
[[file line col] macro.cursor
#let [location (format file
"," (|> line nat-to-int %i)
"," (|> col nat-to-int %i))]]
(macro.fail (format message "\n\n"
"@ " location))))
(def: #export (throw exception message)
(All [e a] (-> (ex.Exception e) e (Meta a)))
(fail (ex.construct exception message)))
(syntax: #export (assert exception message test)
(wrap (list (` (if (~ test)
(:: macro.Monad<Meta> (~' wrap) [])
(..throw (~ exception) (~ message)))))))
(def: #export (with-type expected action)
(All [a] (-> Type (Meta a) (Meta a)))
(function (_ compiler)
(case (action (set@ #.expected (#.Some expected) compiler))
(#e.Success [compiler' output])
(let [old-expected (get@ #.expected compiler)]
(#e.Success [(set@ #.expected old-expected compiler')
output]))
(#e.Error error)
(#e.Error error))))
(def: #export (with-type-env action)
(All [a] (-> (tc.Check a) (Meta a)))
(function (_ compiler)
(case (action (get@ #.type-context compiler))
(#e.Error error)
((fail error) compiler)
(#e.Success [context' output])
(#e.Success [(set@ #.type-context context' compiler)
output]))))
(def: #export (with-fresh-type-env action)
(All [a] (-> (Meta a) (Meta a)))
(function (_ compiler)
(let [old (get@ #.type-context compiler)]
(case (action (set@ #.type-context tc.fresh-context compiler))
(#e.Success [compiler' output])
(#e.Success [(set@ #.type-context old compiler')
output])
output
output))))
(def: #export (infer actualT)
(-> Type (Meta Unit))
(do macro.Monad<Meta>
[expectedT macro.expected-type]
(with-type-env
(tc.check expectedT actualT))))
(def: #export (pl-get key table)
(All [a] (-> Text (List [Text a]) (Maybe a)))
(case table
#.Nil
#.None
(#.Cons [k' v'] table')
(if (text/= key k')
(#.Some v')
(pl-get key table'))))
(def: #export (pl-contains? key table)
(All [a] (-> Text (List [Text a]) Bool))
(case (pl-get key table)
(#.Some _)
true
#.None
false))
(def: #export (pl-put key val table)
(All [a] (-> Text a (List [Text a]) (List [Text a])))
(case table
#.Nil
(list [key val])
(#.Cons [k' v'] table')
(if (text/= key k')
(#.Cons [key val]
table')
(#.Cons [k' v']
(pl-put key val table')))))
(def: #export (pl-update key f table)
(All [a] (-> Text (-> a a) (List [Text a]) (List [Text a])))
(case table
#.Nil
#.Nil
(#.Cons [k' v'] table')
(if (text/= key k')
(#.Cons [k' (f v')] table')
(#.Cons [k' v'] (pl-update key f table')))))
(def: #export (with-source-code source action)
(All [a] (-> Source (Meta a) (Meta a)))
(function (_ compiler)
(let [old-source (get@ #.source compiler)]
(case (action (set@ #.source source compiler))
(#e.Error error)
(#e.Error error)
(#e.Success [compiler' output])
(#e.Success [(set@ #.source old-source compiler')
output])))))
(def: #export (with-stacked-errors handler action)
(All [a] (-> (-> [] Text) (Meta a) (Meta a)))
(function (_ compiler)
(case (action compiler)
(#e.Success [compiler' output])
(#e.Success [compiler' output])
(#e.Error error)
(#e.Error (if (text/= "" error)
(handler [])
(format (handler []) "\n\n-----------------------------------------\n\n" error))))))
(def: fresh-bindings
(All [k v] (Bindings k v))
{#.counter +0
#.mappings (list)})
(def: fresh-scope
Scope
{#.name (list)
#.inner +0
#.locals fresh-bindings
#.captured fresh-bindings})
(def: #export (with-scope action)
(All [a] (-> (Meta a) (Meta [Scope a])))
(function (_ compiler)
(case (action (update@ #.scopes (|>> (#.Cons fresh-scope)) compiler))
(#e.Success [compiler' output])
(case (get@ #.scopes compiler')
#.Nil
(#e.Error "Impossible error: Drained scopes!")
(#.Cons head tail)
(#e.Success [(set@ #.scopes tail compiler')
[head output]]))
(#e.Error error)
(#e.Error error))))
(def: #export (with-current-module name action)
(All [a] (-> Text (Meta a) (Meta a)))
(function (_ compiler)
(case (action (set@ #.current-module (#.Some name) compiler))
(#e.Success [compiler' output])
(#e.Success [(set@ #.current-module
(get@ #.current-module compiler)
compiler')
output])
(#e.Error error)
(#e.Error error))))
(def: #export (with-cursor cursor action)
(All [a] (-> Cursor (Meta a) (Meta a)))
(if (text/= "" (product.left cursor))
action
(function (_ compiler)
(let [old-cursor (get@ #.cursor compiler)]
(case (action (set@ #.cursor cursor compiler))
(#e.Success [compiler' output])
(#e.Success [(set@ #.cursor old-cursor compiler')
output])
(#e.Error error)
(#e.Error error))))))
(def: (normalize-char char)
(-> Nat Text)
(case char
(^ (char "*")) "_ASTER_"
(^ (char "+")) "_PLUS_"
(^ (char "-")) "_DASH_"
(^ (char "/")) "_SLASH_"
(^ (char "\\")) "_BSLASH_"
(^ (char "_")) "_UNDERS_"
(^ (char "%")) "_PERCENT_"
(^ (char "$")) "_DOLLAR_"
(^ (char "'")) "_QUOTE_"
(^ (char "`")) "_BQUOTE_"
(^ (char "@")) "_AT_"
(^ (char "^")) "_CARET_"
(^ (char "&")) "_AMPERS_"
(^ (char "=")) "_EQ_"
(^ (char "!")) "_BANG_"
(^ (char "?")) "_QM_"
(^ (char ":")) "_COLON_"
(^ (char ".")) "_PERIOD_"
(^ (char ",")) "_COMMA_"
(^ (char "<")) "_LT_"
(^ (char ">")) "_GT_"
(^ (char "~")) "_TILDE_"
(^ (char "|")) "_PIPE_"
_
(text.from-code char)))
(def: underflow Nat (n/dec +0))
(def: #export (normalize-name name)
(-> Text Text)
(loop [idx (n/dec (text.size name))
output ""]
(if (n/= underflow idx)
output
(recur (n/dec idx) (format (|> (text.nth idx name) maybe.assume normalize-char) output)))))
(exception: #export (Error {message Text})
message)
(def: #export (with-error-tracking action)
(All [a] (-> (Meta a) (Meta a)))
(function (_ compiler)
(case (action compiler)
(#e.Error error)
((throw Error error) compiler)
output
output)))
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