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(.module:
[library
[lux (#- nat int rev local)
[abstract
["." monad (#+ do)]]
[control
["." try (#+ Try)]]
[data
["." bit]
["." text ("#\." monoid)]
["." name]
[collection
["." list ("#\." functor)]]]
[macro
["." code ("#\." equivalence)]]
[math
[number
["." nat]
["." int]
["." rev]
["." frac]]]]]
["." //])
(def: (un_paired pairs)
(All [a] (-> (List [a a]) (List a)))
(case pairs
#.End #.End
(#.Item [[x y] pairs']) (list& x y (un_paired pairs'))))
(type: .public Parser
{#.doc "A Lux code parser."}
(//.Parser (List Code)))
(def: remaining_inputs
(-> (List Code) Text)
(|>> (list\map code.format)
(text.interposed " ")
($_ text\compose text.new_line "Remaining input: ")))
(def: .public any
{#.doc "Yields the next input without applying any logic."}
(Parser Code)
(function (_ tokens)
(case tokens
#.End
(#try.Failure "There are no tokens to parse!")
(#.Item [t tokens'])
(#try.Success [tokens' t]))))
(template [<query> <check> <type> <tag> <eq> <desc>]
[(with_expansions [<failure> (as_is (#try.Failure ($_ text\compose "Cannot parse " <desc> (remaining_inputs tokens))))]
(def: .public <query>
{#.doc (code.text ($_ text\compose "Parses the next " <desc> " input."))}
(Parser <type>)
(function (_ tokens)
(case tokens
(#.Item [[_ (<tag> x)] tokens'])
(#try.Success [tokens' x])
_
<failure>)))
(def: .public (<check> expected)
{#.doc (code.text ($_ text\compose "Checks for a specific " <desc> " input."))}
(-> <type> (Parser Any))
(function (_ tokens)
(case tokens
(#.Item [[_ (<tag> actual)] tokens'])
(if (\ <eq> = expected actual)
(#try.Success [tokens' []])
<failure>)
_
<failure>))))]
[bit bit! Bit #.Bit bit.equivalence "bit"]
[nat nat! Nat #.Nat nat.equivalence "nat"]
[int int! Int #.Int int.equivalence "int"]
[rev rev! Rev #.Rev rev.equivalence "rev"]
[frac frac! Frac #.Frac frac.equivalence "frac"]
[text text! Text #.Text text.equivalence "text"]
[identifier identifier! Name #.Identifier name.equivalence "identifier"]
[tag tag! Name #.Tag name.equivalence "tag"]
)
(def: .public (this! code)
{#.doc "Ensures the given Code is the next input."}
(-> Code (Parser Any))
(function (_ tokens)
(case tokens
(#.Item [token tokens'])
(if (code\= code token)
(#try.Success [tokens' []])
(#try.Failure ($_ text\compose "Expected a " (code.format code) " but instead got " (code.format token)
(remaining_inputs tokens))))
_
(#try.Failure "There are no tokens to parse!"))))
(template [<query> <check> <tag> <eq> <desc>]
[(with_expansions [<failure> (as_is (#try.Failure ($_ text\compose "Cannot parse " <desc> (remaining_inputs tokens))))]
(def: .public <query>
{#.doc (code.text ($_ text\compose "Parse a local " <desc> " (a " <desc> " that has no module prefix)."))}
(Parser Text)
(function (_ tokens)
(case tokens
(#.Item [[_ (<tag> ["" x])] tokens'])
(#try.Success [tokens' x])
_
<failure>)))
(def: .public (<check> expected)
{#.doc (code.text ($_ text\compose "Checks for a specific local " <desc> " (a " <desc> " that has no module prefix)."))}
(-> Text (Parser Any))
(function (_ tokens)
(case tokens
(#.Item [[_ (<tag> ["" actual])] tokens'])
(if (\ <eq> = expected actual)
(#try.Success [tokens' []])
<failure>)
_
<failure>))))]
[local_identifier local_identifier! #.Identifier text.equivalence "local identifier"]
[ local_tag local_tag! #.Tag text.equivalence "local tag"]
)
(template [<name> <tag> <desc>]
[(def: .public (<name> p)
{#.doc (code.text ($_ text\compose "Parses the contents of a " <desc> "."))}
(All [a]
(-> (Parser a) (Parser a)))
(function (_ tokens)
(case tokens
(#.Item [[_ (<tag> members)] tokens'])
(case (p members)
(#try.Success [#.End x]) (#try.Success [tokens' x])
_ (#try.Failure ($_ text\compose "Parser was expected to fully consume " <desc> (remaining_inputs tokens))))
_
(#try.Failure ($_ text\compose "Cannot parse " <desc> (remaining_inputs tokens))))))]
[ form #.Form "form"]
[tuple #.Tuple "tuple"]
)
(def: .public (record p)
{#.doc "Parses the contents of a record."}
(All [a]
(-> (Parser a) (Parser a)))
(function (_ tokens)
(case tokens
(#.Item [[_ (#.Record pairs)] tokens'])
(case (p (un_paired pairs))
(#try.Success [#.End x]) (#try.Success [tokens' x])
_ (#try.Failure ($_ text\compose "Parser was expected to fully consume record" (remaining_inputs tokens))))
_
(#try.Failure ($_ text\compose "Cannot parse record" (remaining_inputs tokens))))))
(def: .public end!
{#.doc "Verifies there are no more inputs."}
(Parser Any)
(function (_ tokens)
(case tokens
#.End (#try.Success [tokens []])
_ (#try.Failure ($_ text\compose "Expected list of tokens to be empty!" (remaining_inputs tokens))))))
(def: .public end?
{#.doc "Checks whether there are no more inputs."}
(Parser Bit)
(function (_ tokens)
(#try.Success [tokens (case tokens
#.End true
_ false)])))
(def: .public (result parser inputs)
{#.doc (example "Executes a parser against a stream of code, and verifies all the inputs are consumed.")}
(All [a] (-> (Parser a) (List Code) (Try a)))
(case (parser inputs)
(#try.Failure error)
(#try.Failure error)
(#try.Success [unconsumed value])
(case unconsumed
#.End
(#try.Success value)
_
(#try.Failure (|> unconsumed
(list\map code.format)
(text.interposed ", ")
(text\compose "Unconsumed inputs: "))))))
(def: .public (local inputs parser)
{#.doc "Runs parser against the given list of inputs."}
(All [a] (-> (List Code) (Parser a) (Parser a)))
(function (_ real)
(do try.monad
[value (..result parser inputs)]
(in [real value]))))
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