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|
(.require
[library
[lux (.except symbol)
[abstract
["[0]" monad (.only do)]]
[control
["//" parser (.use "[1]#[0]" functor)]
["[0]" try (.only Try)]
["[0]" exception (.only Exception)]]
[data
["[0]" bit]
["[0]" text (.use "[1]#[0]" equivalence monoid)]
[collection
["[0]" list (.use "[1]#[0]" functor)]
["[0]" sequence]
["[0]" dictionary (.only Dictionary)]]]
[math
[number
["[0]" frac]]]
[meta
["[0]" code]]]]
[\\library
["[0]" / (.only JSON)]])
(type .public (Parser a)
(//.Parser (List JSON) a))
(exception.def .public (unconsumed_input input)
(Exception (List JSON))
(exception.report
(list ["Input" (exception.listing /.format input)])))
(exception.def .public empty_input)
(def .public (result parser json)
(All (_ a) (-> (Parser a) JSON (Try a)))
(when (//.result parser (list json))
{try.#Success [remainder output]}
(when remainder
{.#End}
{try.#Success output}
_
(exception.except ..unconsumed_input remainder))
{try.#Failure error}
{try.#Failure error}))
(def .public any
(Parser JSON)
(<| (function (_ inputs))
(when inputs
{.#End}
(exception.except ..empty_input [])
{.#Item head tail}
{try.#Success [tail head]})))
(exception.def .public (unexpected_value value)
(Exception JSON)
(exception.report
(list ["Value" (/.format value)])))
(with_template [<name> <type> <tag>]
[(def .public <name>
(Parser <type>)
(do //.monad
[head ..any]
(when head
{<tag> value}
(in value)
_
(//.failure (exception.error ..unexpected_value [head])))))]
[null /.Null /.#Null]
[boolean /.Boolean /.#Boolean]
[number /.Number /.#Number]
[string /.String /.#String]
)
(exception.def .public (value_mismatch [reference sample])
(Exception [JSON JSON])
(exception.report
(list ["Reference" (/.format reference)]
["Sample" (/.format sample)])))
(with_template [<test> <check> <type> <equivalence> <tag>]
[(def .public (<test> test)
(-> <type> (Parser Bit))
(do //.monad
[head ..any]
(when head
{<tag> value}
(in (at <equivalence> = test value))
_
(//.failure (exception.error ..unexpected_value [head])))))
(def .public (<check> test)
(-> <type> (Parser Any))
(do //.monad
[head ..any]
(when head
{<tag> value}
(if (at <equivalence> = test value)
(in [])
(//.failure (exception.error ..value_mismatch [{<tag> test} {<tag> value}])))
_
(//.failure (exception.error ..unexpected_value [head])))))]
[boolean? this_boolean /.Boolean bit.equivalence /.#Boolean]
[number? this_number /.Number frac.equivalence /.#Number]
[string? this_string /.String text.equivalence /.#String]
)
(def .public (nullable parser)
(All (_ a) (-> (Parser a) (Parser (Maybe a))))
(//.or ..null
parser))
(def .public (array parser)
(All (_ a) (-> (Parser a) (Parser a)))
(do //.monad
[head ..any]
(when head
{/.#Array values}
(when (//.result parser (sequence.list values))
{try.#Failure error}
(//.failure error)
{try.#Success [remainder output]}
(when remainder
{.#End}
(in output)
_
(//.failure (exception.error ..unconsumed_input remainder))))
_
(//.failure (exception.error ..unexpected_value [head])))))
(def .public (object parser)
(All (_ a) (-> (Parser a) (Parser a)))
(do //.monad
[head ..any]
(when head
{/.#Object kvs}
(when (|> kvs
dictionary.entries
(list#each (function (_ [key value])
(list {/.#String key} value)))
list.together
(//.result parser))
{try.#Failure error}
(//.failure error)
{try.#Success [remainder output]}
(when remainder
{.#End}
(in output)
_
(//.failure (exception.error ..unconsumed_input remainder))))
_
(//.failure (exception.error ..unexpected_value [head])))))
(def .public (field field_name parser)
(All (_ a) (-> Text (Parser a) (Parser a)))
(function (again inputs)
(when inputs
(list.partial {/.#String key} value inputs')
(if (text#= key field_name)
(when (//.result parser (list value))
{try.#Success [{.#End} output]}
{try.#Success [inputs' output]}
{try.#Success [inputs'' _]}
(exception.except ..unconsumed_input inputs'')
{try.#Failure error}
{try.#Failure error})
(do try.monad
[[inputs'' output] (again inputs')]
(in [(list.partial {/.#String key} value inputs'')
output])))
{.#End}
(exception.except ..empty_input [])
_
(exception.except ..unconsumed_input inputs))))
(def .public dictionary
(All (_ a) (-> (Parser a) (Parser (Dictionary Text a))))
(|>> (//.and ..string)
//.some
..object
(//#each (dictionary.of_list text.hash))))
|
