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(.module:
[library
[lux (#- nat int rev local not)
[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
(//.Parser (List Code)))
(def: remaining_inputs
(-> (List Code) Text)
(|>> (list\each code.format)
(text.interposed " ")
($_ text\composite text.new_line "Remaining input: ")))
(def: .public any
(Parser Code)
(function (_ tokens)
(case tokens
#.End
(#try.Failure "There are no tokens to parse!")
(#.Item [t tokens'])
(#try.Success [tokens' t]))))
(def: .public next
(Parser Code)
(function (_ tokens)
(case tokens
#.End
(#try.Failure "There are no tokens to parse!")
(#.Item next _)
(#try.Success [tokens next]))))
(template [<query> <check> <type> <tag> <eq> <desc>]
[(with_expansions [<failure> (as_is (#try.Failure ($_ text\composite "Cannot parse " <desc> (remaining_inputs tokens))))]
(def: .public <query>
(Parser <type>)
(function (_ tokens)
(case tokens
(#.Item [[_ (<tag> x)] tokens'])
(#try.Success [tokens' x])
_
<failure>)))
(def: .public (<check> expected)
(-> <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)
(-> Code (Parser Any))
(function (_ tokens)
(case tokens
(#.Item [token tokens'])
(if (code\= code token)
(#try.Success [tokens' []])
(#try.Failure ($_ text\composite "Expected a " (code.format code) " but instead got " (code.format token)
(remaining_inputs tokens))))
_
(#try.Failure "There are no tokens to parse!"))))
(template [<query> <check> <tag> <eq> <desc>]
[(with_expansions [<failure> (as_is (#try.Failure ($_ text\composite "Cannot parse " <desc> (remaining_inputs tokens))))]
(def: .public <query>
(Parser Text)
(function (_ tokens)
(case tokens
(#.Item [[_ (<tag> ["" x])] tokens'])
(#try.Success [tokens' x])
_
<failure>)))
(def: .public (<check> expected)
(-> 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)
(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 ($_ text\composite "Parser was expected to fully consume " <desc> (remaining_inputs tokens))))
_
(#try.Failure ($_ text\composite "Cannot parse " <desc> (remaining_inputs tokens))))))]
[ form #.Form "form"]
[tuple #.Tuple "tuple"]
)
(def: .public (record p)
(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 ($_ text\composite "Parser was expected to fully consume record" (remaining_inputs tokens))))
_
(#try.Failure ($_ text\composite "Cannot parse record" (remaining_inputs tokens))))))
(def: .public end!
(Parser Any)
(function (_ tokens)
(case tokens
#.End (#try.Success [tokens []])
_ (#try.Failure ($_ text\composite "Expected list of tokens to be empty!" (remaining_inputs tokens))))))
(def: .public end?
(Parser Bit)
(function (_ tokens)
(#try.Success [tokens (case tokens
#.End true
_ false)])))
(def: .public (result parser inputs)
(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\each code.format)
(text.interposed ", ")
(text\composite "Unconsumed inputs: "))))))
(def: .public (local inputs parser)
(All (_ a) (-> (List Code) (Parser a) (Parser a)))
(function (_ real)
(do try.monad
[value (..result parser inputs)]
(in [real value]))))
(def: .public (not parser)
(All (_ a) (-> (Parser a) (Parser Code)))
(do //.monad
[sample ..next
result (//.or parser
..any)]
(case result
(#.Left _) (//.failure (text\composite "Did NOT expect to parse code: " (code.format sample)))
(#.Right output) (in output))))
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