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(.module:
[lux (#- nat int rev)]
(lux [macro (#+ with-gensyms)]
(control [monad (#+ do Monad)]
[equivalence (#+ Equivalence)]
["p" parser])
(data [bool]
[number]
[text ("text/" Monoid<Text>)]
[ident]
(collection [list ("list/" Functor<List>)])
[maybe]
[error (#+ Error)]))
(// [code ("code/" Equivalence<Code>)]))
## [Utils]
(def: (join-pairs pairs)
(All [a] (-> (List [a a]) (List a)))
(case pairs
#.Nil #.Nil
(#.Cons [[x y] pairs']) (list& x y (join-pairs pairs'))))
## [Types]
(type: #export Syntax
{#.doc "A Lux syntax parser."}
(p.Parser (List Code)))
## [Utils]
(def: (remaining-inputs asts)
(-> (List Code) Text)
($_ text/compose "\nRemaining input: "
(|> asts (list/map code.to-text) (list.interpose " ") (text.join-with ""))))
## [Syntaxs]
(def: #export any
{#.doc "Just returns the next input without applying any logic."}
(Syntax Code)
(function (_ tokens)
(case tokens
#.Nil (#error.Error "There are no tokens to parse!")
(#.Cons [t tokens']) (#error.Success [tokens' t]))))
(do-template [<get-name> <type> <tag> <eq> <desc>]
[(def: #export <get-name>
{#.doc (code.text ($_ text/compose "Parses the next " <desc> " input Code."))}
(Syntax <type>)
(function (_ tokens)
(case tokens
(#.Cons [[_ (<tag> x)] tokens'])
(#error.Success [tokens' x])
_
(#error.Error ($_ text/compose "Cannot parse " <desc> (remaining-inputs tokens))))))]
[ bool Bool #.Bool bool.Equivalence<Bool> "bool"]
[ nat Nat #.Nat number.Equivalence<Nat> "nat"]
[ int Int #.Int number.Equivalence<Int> "int"]
[ rev Rev #.Rev number.Equivalence<Rev> "rev"]
[ frac Frac #.Frac number.Equivalence<Frac> "frac"]
[ text Text #.Text text.Equivalence<Text> "text"]
[symbol Ident #.Symbol ident.Equivalence<Ident> "symbol"]
[ tag Ident #.Tag ident.Equivalence<Ident> "tag"]
)
(def: #export (this? ast)
{#.doc "Asks if the given Code is the next input."}
(-> Code (Syntax Bool))
(function (_ tokens)
(case tokens
(#.Cons [token tokens'])
(let [is-it? (code/= ast token)
remaining (if is-it?
tokens'
tokens)]
(#error.Success [remaining is-it?]))
_
(#error.Success [tokens false]))))
(def: #export (this ast)
{#.doc "Ensures the given Code is the next input."}
(-> Code (Syntax Any))
(function (_ tokens)
(case tokens
(#.Cons [token tokens'])
(if (code/= ast token)
(#error.Success [tokens' []])
(#error.Error ($_ text/compose "Expected a " (code.to-text ast) " but instead got " (code.to-text token)
(remaining-inputs tokens))))
_
(#error.Error "There are no tokens to parse!"))))
(do-template [<name> <tag> <desc>]
[(def: #export <name>
{#.doc (code.text ($_ text/compose "Parse a local " <desc> " (a " <desc> " that has no module prefix)."))}
(Syntax Text)
(function (_ tokens)
(case tokens
(#.Cons [[_ (<tag> ["" x])] tokens'])
(#error.Success [tokens' x])
_
(#error.Error ($_ text/compose "Cannot parse local " <desc> (remaining-inputs tokens))))))]
[local-symbol #.Symbol "symbol"]
[ local-tag #.Tag "tag"]
)
(do-template [<name> <tag> <desc>]
[(def: #export (<name> p)
{#.doc (code.text ($_ text/compose "Parse inside the contents of a " <desc> " as if they were the input Codes."))}
(All [a]
(-> (Syntax a) (Syntax a)))
(function (_ tokens)
(case tokens
(#.Cons [[_ (<tag> members)] tokens'])
(case (p members)
(#error.Success [#.Nil x]) (#error.Success [tokens' x])
_ (#error.Error ($_ text/compose "Syntax was expected to fully consume " <desc> (remaining-inputs tokens))))
_
(#error.Error ($_ text/compose "Cannot parse " <desc> (remaining-inputs tokens))))))]
[ form #.Form "form"]
[tuple #.Tuple "tuple"]
)
(def: #export (record p)
{#.doc (code.text ($_ text/compose "Parse inside the contents of a record as if they were the input Codes."))}
(All [a]
(-> (Syntax a) (Syntax a)))
(function (_ tokens)
(case tokens
(#.Cons [[_ (#.Record pairs)] tokens'])
(case (p (join-pairs pairs))
(#error.Success [#.Nil x]) (#error.Success [tokens' x])
_ (#error.Error ($_ text/compose "Syntax was expected to fully consume record" (remaining-inputs tokens))))
_
(#error.Error ($_ text/compose "Cannot parse record" (remaining-inputs tokens))))))
(def: #export end!
{#.doc "Ensures there are no more inputs."}
(Syntax Any)
(function (_ tokens)
(case tokens
#.Nil (#error.Success [tokens []])
_ (#error.Error ($_ text/compose "Expected list of tokens to be empty!" (remaining-inputs tokens))))))
(def: #export end?
{#.doc "Checks whether there are no more inputs."}
(Syntax Bool)
(function (_ tokens)
(case tokens
#.Nil (#error.Success [tokens true])
_ (#error.Success [tokens false]))))
(def: #export (on compiler action)
{#.doc "Run a Lux operation as if it was a Syntax parser."}
(All [a] (-> Lux (Meta a) (Syntax a)))
(function (_ input)
(case (macro.run compiler action)
(#error.Error error)
(#error.Error error)
(#error.Success value)
(#error.Success [input value])
)))
(def: #export (run inputs syntax)
(All [a] (-> (List Code) (Syntax a) (Error a)))
(case (syntax inputs)
(#error.Error error)
(#error.Error error)
(#error.Success [unconsumed value])
(case unconsumed
#.Nil
(#error.Success value)
_
(#error.Error (text/compose "Unconsumed inputs: "
(|> (list/map code.to-text unconsumed)
(text.join-with ", ")))))))
(def: #export (local inputs syntax)
{#.doc "Run a syntax parser with the given list of inputs, instead of the real ones."}
(All [a] (-> (List Code) (Syntax a) (Syntax a)))
(function (_ real)
(do error.Monad<Error>
[value (run inputs syntax)]
(wrap [real value]))))
## [Syntax]
(macro: #export (syntax: tokens)
{#.doc (doc "A more advanced way to define macros than \"macro:\"."
"The inputs to the macro can be parsed in complex ways through the use of syntax parsers."
"The macro body is also (implicitly) run in the Monad<Meta>, to save some typing."
"Also, the compiler state can be accessed through the *compiler* binding."
(syntax: #export (object {#let [imports (class-imports *compiler*)]}
{#let [class-vars (list)]}
{super (opt (super-class-decl^ imports class-vars))}
{interfaces (tuple (some (super-class-decl^ imports class-vars)))}
{constructor-args (constructor-args^ imports class-vars)}
{methods (some (overriden-method-def^ imports))})
(let [def-code ($_ text/compose "anon-class:"
(spaced (list (super-class-decl$ (maybe.default object-super-class super))
(with-brackets (spaced (list/map super-class-decl$ interfaces)))
(with-brackets (spaced (list/map constructor-arg$ constructor-args)))
(with-brackets (spaced (list/map (method-def$ id) methods))))))]
(wrap (list (` ((~ (code.text def-code)))))))))}
(let [[exported? tokens] (: [Bool (List Code)]
(case tokens
(^ (list& [_ (#.Tag ["" "export"])] tokens'))
[true tokens']
_
[false tokens]))
?parts (: (Maybe [Text (List Code) Code Code])
(case tokens
(^ (list [_ (#.Form (list& [_ (#.Symbol ["" name])] args))]
body))
(#.Some name args (` {}) body)
(^ (list [_ (#.Form (list& [_ (#.Symbol ["" name])] args))]
meta-data
body))
(#.Some name args meta-data body)
_
#.None))]
(case ?parts
(#.Some [name args meta body])
(with-gensyms [g!tokens g!body g!error]
(do macro.Monad<Meta>
[vars+parsers (monad.map @
(: (-> Code (Meta [Code Code]))
(function (_ arg)
(case arg
(^ [_ (#.Record (list [var parser]))])
(wrap [var parser])
[_ (#.Symbol var-name)]
(wrap [(code.symbol var-name) (` any)])
_
(macro.fail "Syntax pattern expects records or symbols."))))
args)
#let [g!state (code.symbol ["" "*compiler*"])
error-msg (code.text (text/compose "Wrong syntax for " name))
export-ast (: (List Code)
(if exported?
(list (' #export))
(list)))]]
(wrap (list (` (macro: (~+ export-ast) ((~ (code.symbol ["" name])) (~ g!tokens) (~ g!state))
(~ meta)
({(#error.Success (~ g!body))
((~ g!body) (~ g!state))
(#error.Error (~ g!error))
(#error.Error ((~! text.join-with) ": " (list (~ error-msg) (~ g!error))))}
(..run (~ g!tokens)
(: (..Syntax (Meta (List Code)))
((~! do) (~! p.Monad<Parser>)
[(~+ (join-pairs vars+parsers))]
((~' wrap) ((~! do) (~! macro.Monad<Meta>)
[]
(~ body)))))))))))))
_
(macro.fail "Wrong syntax for syntax:"))))
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