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(.using
[library
[lux {"-" nat int rev local not symbol local global}
[abstract
["[0]" monad {"+" do}]]
[control
["[0]" try {"+" Try}]]
[data
["[0]" bit]
["[0]" text ("[1]#[0]" monoid)]
[collection
["[0]" list ("[1]#[0]" functor)]]]
[macro
["[0]" code ("[1]#[0]" equivalence)]]
[math
[number
["[0]" nat]
["[0]" int]
["[0]" rev]
["[0]" frac]]]
[meta
["[0]" symbol]]]]
["[0]" //])
(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 " ")
($_ text#composite text.new_line "Remaining input: ")))
(def: .public any
(Parser Code)
(function (_ tokens)
(case tokens
{.#End}
{try.#Failure "There are no tokens to parse!"}
{.#Item [t tokens']}
{try.#Success [tokens' t]})))
(def: .public next
(Parser Code)
(function (_ tokens)
(case tokens
{.#End}
{try.#Failure "There are no tokens to parse!"}
{.#Item next _}
{try.#Success [tokens next]})))
(template [<query> <check> <type> <tag> <eq> <desc>]
[(with_expansions [<failure> (these {try.#Failure ($_ 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 this_bit Bit .#Bit bit.equivalence "bit"]
[nat this_nat Nat .#Nat nat.equivalence "nat"]
[int this_int Int .#Int int.equivalence "int"]
[rev this_rev Rev .#Rev rev.equivalence "rev"]
[frac this_frac Frac .#Frac frac.equivalence "frac"]
[text this_text Text .#Text text.equivalence "text"]
[symbol this_symbol Symbol .#Symbol symbol.equivalence "symbol"]
)
(def: .public (this code)
(-> Code (Parser Any))
(function (_ tokens)
(case tokens
{.#Item [token tokens']}
(if (code#= code token)
{try.#Success [tokens' []]}
{try.#Failure ($_ text#composite "Expected a " (code.format code) " but instead got " (code.format token)
(remaining_inputs tokens))})
_
{try.#Failure "There are no tokens to parse!"})))
(with_expansions [<failure> (these {try.#Failure ($_ text#composite "Cannot parse local symbol" (remaining_inputs tokens))})]
(def: .public local
(Parser Text)
(function (_ tokens)
(case tokens
{.#Item [[_ {.#Symbol ["" x]}] tokens']}
{try.#Success [tokens' x]}
_
<failure>)))
(def: .public (this_local expected)
(-> Text (Parser Any))
(function (_ tokens)
(case tokens
{.#Item [[_ {.#Symbol ["" actual]}] tokens']}
(if (# text.equivalence = expected actual)
{try.#Success [tokens' []]}
<failure>)
_
<failure>))))
(with_expansions [<failure> (these {try.#Failure ($_ text#composite "Cannot parse local symbol" (remaining_inputs tokens))})]
(def: .public global
(Parser Symbol)
(function (_ tokens)
(case tokens
{.#Item [[_ {.#Symbol ["" short]}] tokens']}
<failure>
{.#Item [[_ {.#Symbol it}] tokens']}
{try.#Success [tokens' it]}
_
<failure>)))
(def: .public (this_global expected)
(-> Symbol (Parser Any))
(function (_ tokens)
(case tokens
{.#Item [[_ {.#Symbol ["" actual]}] tokens']}
<failure>
{.#Item [[_ {.#Symbol it}] tokens']}
(if (# symbol.equivalence = expected it)
{try.#Success [tokens' []]}
<failure>)
_
<failure>))))
(template [<name> <tag> <desc>]
[(def: .public (<name> p)
(All (_ a)
(-> (Parser a) (Parser a)))
(function (_ tokens)
(case tokens
{.#Item [[_ {<tag> members}] tokens']}
(case (p members)
{try.#Success [{.#End} x]} {try.#Success [tokens' x]}
_ {try.#Failure ($_ text#composite "Parser was expected to fully consume " <desc> (remaining_inputs tokens))})
_
{try.#Failure ($_ text#composite "Cannot parse " <desc> (remaining_inputs tokens))})))]
[form .#Form "form"]
[variant .#Variant "variant"]
[tuple .#Tuple "tuple"]
)
(def: .public end
(Parser Any)
(function (_ tokens)
(case tokens
{.#End} {try.#Success [tokens []]}
_ {try.#Failure ($_ 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 (locally 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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