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|
(.module:
[library
[lux #*
[abstract
["." monad (#+ do)]]
[control
["." try (#+ Try)]
["." exception (#+ exception:)]]
[data
["." bit]
["." text ("#\." equivalence monoid)]
[collection
["." list ("#\." functor)]
["." row]
["." dictionary (#+ Dictionary)]]
[format
["/" json (#+ JSON)]]]
[macro
["." code]]
[math
[number
["." frac]]]]]
["." // ("#\." functor)])
(type: #export (Parser a)
{#.doc "JSON parser."}
(//.Parser (List JSON) a))
(exception: #export (unconsumed_input {input (List JSON)})
(exception.report
["Input" (exception.enumerate /.format input)]))
(exception: #export empty_input)
(def: #export (run parser json)
(All [a] (-> (Parser a) JSON (Try a)))
(case (//.run parser (list json))
(#try.Success [remainder output])
(case remainder
#.Nil
(#try.Success output)
_
(exception.throw ..unconsumed_input remainder))
(#try.Failure error)
(#try.Failure error)))
(def: #export any
{#.doc "Just returns the JSON input without applying any logic."}
(Parser JSON)
(<| (function (_ inputs))
(case inputs
#.Nil
(exception.throw ..empty_input [])
(#.Cons head tail)
(#try.Success [tail head]))))
(exception: #export (unexpected_value {value JSON})
(exception.report
["Value" (/.format value)]))
(template [<name> <type> <tag> <desc>]
[(def: #export <name>
{#.doc (code.text ($_ text\compose "Reads a JSON value as " <desc> "."))}
(Parser <type>)
(do //.monad
[head ..any]
(case head
(<tag> value)
(wrap value)
_
(//.fail (exception.construct ..unexpected_value [head])))))]
[null /.Null #/.Null "null"]
[boolean /.Boolean #/.Boolean "boolean"]
[number /.Number #/.Number "number"]
[string /.String #/.String "string"]
)
(exception: #export [a] (value_mismatch {reference JSON} {sample JSON})
(exception.report
["Reference" (/.format reference)]
["Sample" (/.format sample)]))
(template [<test> <check> <type> <equivalence> <tag> <desc>]
[(def: #export (<test> test)
{#.doc (code.text ($_ text\compose "Asks whether a JSON value is a " <desc> "."))}
(-> <type> (Parser Bit))
(do //.monad
[head ..any]
(case head
(<tag> value)
(wrap (\ <equivalence> = test value))
_
(//.fail (exception.construct ..unexpected_value [head])))))
(def: #export (<check> test)
{#.doc (code.text ($_ text\compose "Ensures a JSON value is a " <desc> "."))}
(-> <type> (Parser Any))
(do //.monad
[head ..any]
(case head
(<tag> value)
(if (\ <equivalence> = test value)
(wrap [])
(//.fail (exception.construct ..value_mismatch [(<tag> test) (<tag> value)])))
_
(//.fail (exception.construct ..unexpected_value [head])))))]
[boolean? boolean! /.Boolean bit.equivalence #/.Boolean "boolean"]
[number? number! /.Number frac.equivalence #/.Number "number"]
[string? string! /.String text.equivalence #/.String "string"]
)
(def: #export (nullable parser)
(All [a] (-> (Parser a) (Parser (Maybe a))))
(//.or ..null
parser))
(def: #export (array parser)
{#.doc "Parses a JSON array."}
(All [a] (-> (Parser a) (Parser a)))
(do //.monad
[head ..any]
(case head
(#/.Array values)
(case (//.run parser (row.to_list values))
(#try.Failure error)
(//.fail error)
(#try.Success [remainder output])
(case remainder
#.Nil
(wrap output)
_
(//.fail (exception.construct ..unconsumed_input remainder))))
_
(//.fail (exception.construct ..unexpected_value [head])))))
(def: #export (object parser)
{#.doc "Parses a JSON object. Use this with the 'field' combinator."}
(All [a] (-> (Parser a) (Parser a)))
(do //.monad
[head ..any]
(case head
(#/.Object kvs)
(case (|> kvs
dictionary.entries
(list\map (function (_ [key value])
(list (#/.String key) value)))
list.concat
(//.run parser))
(#try.Failure error)
(//.fail error)
(#try.Success [remainder output])
(case remainder
#.Nil
(wrap output)
_
(//.fail (exception.construct ..unconsumed_input remainder))))
_
(//.fail (exception.construct ..unexpected_value [head])))))
(def: #export (field field_name parser)
{#.doc "Parses a field inside a JSON object. Use this inside the 'object' combinator."}
(All [a] (-> Text (Parser a) (Parser a)))
(function (recur inputs)
(case inputs
(^ (list& (#/.String key) value inputs'))
(if (text\= key field_name)
(case (//.run parser (list value))
(#try.Success [#.Nil output])
(#try.Success [inputs' output])
(#try.Success [inputs'' _])
(exception.throw ..unconsumed_input inputs'')
(#try.Failure error)
(#try.Failure error))
(do try.monad
[[inputs'' output] (recur inputs')]
(wrap [(list& (#/.String key) value inputs'')
output])))
#.Nil
(exception.throw ..empty_input [])
_
(exception.throw ..unconsumed_input inputs))))
(def: #export dictionary
{#.doc "Parses a dictionary-like JSON object."}
(All [a] (-> (Parser a) (Parser (Dictionary Text a))))
(|>> (//.and ..string)
//.some
..object
(//\map (dictionary.from_list text.hash))))
|
