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(.module:
[library
[lux #*
[abstract
[monad (#+ do)]]
[control
["." try (#+ Try) ("#\." functor)]
["." exception (#+ exception:)]]
[data
["." name ("#\." equivalence codec)]
["." text
["%" format (#+ format)]]
[collection
["." list]
["." dictionary]]
[format
["/" xml (#+ Attribute Attrs Tag XML)]]]]]
["." //])
(type: .public (Parser a)
(//.Parser [Attrs (List XML)] a))
(exception: .public empty_input)
(exception: .public unexpected_input)
(exception: .public (wrong_tag {expected Tag} {actual Tag})
(exception.report
["Expected" (%.text (/.tag expected))]
["Actual" (%.text (/.tag actual))]))
(exception: .public (unknown_attribute {expected Attribute} {available (List Attribute)})
(exception.report
["Expected" (%.text (/.attribute expected))]
["Available" (exception.listing (|>> /.attribute %.text) available)]))
(exception: .public (unconsumed_inputs {inputs (List XML)})
(exception.report
["Inputs" (exception.listing (\ /.codec encoded) inputs)]))
(def: (result' parser attrs documents)
(All (_ a) (-> (Parser a) Attrs (List XML) (Try a)))
(case (//.result parser [attrs documents])
(#try.Success [[attrs' remaining] output])
(if (list.empty? remaining)
(#try.Success output)
(exception.except ..unconsumed_inputs remaining))
(#try.Failure error)
(#try.Failure error)))
(def: .public (result parser documents)
(All (_ a) (-> (Parser a) (List XML) (Try a)))
(..result' parser /.attributes documents))
(def: .public text
(Parser Text)
(function (_ [attrs documents])
(case documents
#.End
(exception.except ..empty_input [])
(#.Item head tail)
(case head
(#/.Text value)
(#try.Success [[attrs tail] value])
(#/.Node _)
(exception.except ..unexpected_input [])))))
(def: .public tag
(Parser Tag)
(function (_ [attrs documents])
(case documents
#.End
(exception.except ..empty_input [])
(#.Item head _)
(case head
(#/.Text _)
(exception.except ..unexpected_input [])
(#/.Node tag _ _)
(#try.Success [[attrs documents] tag])))))
(def: .public (attribute name)
(-> Attribute (Parser Text))
(function (_ [attrs documents])
(case (dictionary.value name attrs)
#.None
(exception.except ..unknown_attribute [name (dictionary.keys attrs)])
(#.Some value)
(#try.Success [[attrs documents] value]))))
(def: .public (node expected parser)
(All (_ a) (-> Tag (Parser a) (Parser a)))
(function (_ [attrs documents])
(case documents
#.End
(exception.except ..empty_input [])
(#.Item head tail)
(case head
(#/.Text _)
(exception.except ..unexpected_input [])
(#/.Node actual attrs' children)
(if (name\= expected actual)
(|> children
(..result' parser attrs')
(try\each (|>> [[attrs tail]])))
(exception.except ..wrong_tag [expected actual]))))))
(def: .public any
(Parser XML)
(function (_ [attrs documents])
(case documents
#.End
(exception.except ..empty_input [])
(#.Item head tail)
(#try.Success [[attrs tail] head]))))
(exception: .public nowhere)
(def: .public (somewhere parser)
(All (_ a) (-> (Parser a) (Parser a)))
(function (recur [attrs input])
(case (//.result parser [attrs input])
(#try.Success [[attrs remaining] output])
(#try.Success [[attrs remaining] output])
(#try.Failure error)
(case input
#.End
(exception.except ..nowhere [])
(#.Item head tail)
(do try.monad
[[[attrs tail'] output] (recur [attrs tail])]
(in [[attrs (#.Item head tail')]
output]))))))
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