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(.module:
[lux #*
[abstract
[monad (#+ do)]]
[control
["." try (#+ Try)]
["." exception (#+ exception:)]]
[data
["." name ("#\." equivalence codec)]
["." text
["%" format (#+ format)]]
[collection
["." list]
["." dictionary]]
[format
["/" xml (#+ Attribute Tag XML)]]]]
["." //])
(type: #export (Parser a)
(//.Parser (List XML) a))
(exception: #export empty-input)
(exception: #export unexpected-input)
(exception: #export (wrong-tag {expected Tag} {actual Tag})
(exception.report
["Expected" (%.text (/.tag expected))]
["Actual" (%.text (/.tag actual))]))
(exception: #export (unknown-attribute {expected Attribute} {available (List Attribute)})
(exception.report
["Expected" (%.text (/.attribute expected))]
["Available" (exception.enumerate (|>> /.attribute %.text) available)]))
(exception: #export (unconsumed-inputs {inputs (List XML)})
(exception.report
["Inputs" (exception.enumerate (\ /.codec encode) inputs)]))
(def: #export text
(Parser Text)
(function (_ docs)
(case docs
#.Nil
(exception.throw ..empty-input [])
(#.Cons head tail)
(case head
(#/.Text value)
(#try.Success [tail value])
(#/.Node _)
(exception.throw ..unexpected-input [])))))
(def: #export (node expected)
(-> Tag (Parser Any))
(function (_ docs)
(case docs
#.Nil
(exception.throw ..empty-input [])
(#.Cons head _)
(case head
(#/.Text _)
(exception.throw ..unexpected-input [])
(#/.Node actual _attributes _children)
(if (name\= expected actual)
(#try.Success [docs []])
(exception.throw ..wrong-tag [expected actual]))))))
(def: #export tag
(Parser Tag)
(function (_ docs)
(case docs
#.Nil
(exception.throw ..empty-input [])
(#.Cons head _)
(case head
(#/.Text _)
(exception.throw ..unexpected-input [])
(#/.Node tag _attributes _children)
(#try.Success [docs tag])))))
(def: #export (attribute name)
(-> Attribute (Parser Text))
(function (_ docs)
(case docs
#.Nil
(exception.throw ..empty-input [])
(#.Cons head _)
(case head
(#/.Text _)
(exception.throw ..unexpected-input [])
(#/.Node tag attributes children)
(case (dictionary.get name attributes)
#.None
(exception.throw ..unknown-attribute [name (dictionary.keys attributes)])
(#.Some value)
(#try.Success [docs value]))))))
(def: (run' parser docs)
(All [a] (-> (Parser a) (List XML) (Try a)))
(case (//.run parser docs)
(#try.Success [remaining output])
(if (list.empty? remaining)
(#try.Success output)
(exception.throw ..unconsumed-inputs remaining))
(#try.Failure error)
(#try.Failure error)))
(def: #export (children parser)
(All [a] (-> (Parser a) (Parser a)))
(function (_ docs)
(case docs
#.Nil
(exception.throw ..empty-input [])
(#.Cons head tail)
(case head
(#/.Text _)
(exception.throw ..unexpected-input [])
(#/.Node _tag _attributes children)
(do try.monad
[output (run' parser children)]
(wrap [tail output]))))))
(def: #export ignore
(Parser Any)
(function (_ docs)
(case docs
#.Nil
(exception.throw ..empty-input [])
(#.Cons head tail)
(#try.Success [tail []]))))
(def: #export (run parser document)
(All [a] (-> (Parser a) XML (Try a)))
(..run' parser (list document)))
(exception: #export nowhere)
(def: #export (somewhere parser)
(All [a] (-> (Parser a) (Parser a)))
(function (recur input)
(case (//.run parser input)
(#try.Success [remaining output])
(#try.Success [remaining output])
(#try.Failure error)
(case input
#.Nil
(exception.throw ..nowhere [])
(#.Cons head tail)
(do try.monad
[[tail' output] (recur tail)]
(wrap [(#.Cons head tail')
output]))))))
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