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... This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
... If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
(.require
[library
[lux (.except Tag)
[abstract
[monad (.only do)]]
[control
["//" parser]
["[0]" try (.only Try) (.use "[1]#[0]" functor)]
["[0]" exception (.only Exception)]]
[data
["[0]" text
["%" \\format (.only format)]]
[collection
["[0]" list]
["[0]" dictionary]]]
[meta
["[0]" symbol (.use "[1]#[0]" equivalence codec)]]]]
[\\library
["[0]" / (.only Attribute Attrs Tag XML)]])
(type .public (Parser a)
(//.Parser [Attrs (List XML)] a))
(exception.def .public empty_input)
(exception.def .public unexpected_input)
(exception.def .public (wrong_tag [expected actual])
(Exception [Tag Tag])
(exception.report
(list ["Expected" (%.text (/.tag expected))]
["Actual" (%.text (/.tag actual))])))
(exception.def .public (unknown_attribute [expected available])
(Exception [Attribute (List Attribute)])
(exception.report
(list ["Expected" (%.text (/.attribute expected))]
["Available" (exception.listing (|>> /.attribute %.text) available)])))
(exception.def .public (unconsumed_inputs inputs)
(Exception (List XML))
(exception.report
(list ["Inputs" (exception.listing (of /.codec encoded) inputs)])))
(def (result' parser attrs documents)
(All (_ a) (-> (Parser a) Attrs (List XML) (Try a)))
(when (//.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])
(when documents
{.#End}
(exception.except ..empty_input [])
{.#Item head tail}
(when head
{/.#Text value}
{try.#Success [[attrs tail] value]}
{/.#Node _}
(exception.except ..unexpected_input [])))))
(def .public tag
(Parser Tag)
(function (_ [attrs documents])
(when documents
{.#End}
(exception.except ..empty_input [])
{.#Item head _}
(when head
{/.#Text _}
(exception.except ..unexpected_input [])
{/.#Node tag _ _}
{try.#Success [[attrs documents] tag]}))))
(def .public (attribute name)
(-> Attribute (Parser Text))
(function (_ [attrs documents])
(when (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])
(when documents
{.#End}
(exception.except ..empty_input [])
{.#Item head tail}
(when head
{/.#Text _}
(exception.except ..unexpected_input [])
{/.#Node actual attrs' children}
(if (symbol#= expected actual)
(|> children
(..result' parser attrs')
(try#each (|>> [[attrs tail]])))
(exception.except ..wrong_tag [expected actual]))))))
(def .public any
(Parser XML)
(function (_ [attrs documents])
(when documents
{.#End}
(exception.except ..empty_input [])
{.#Item head tail}
{try.#Success [[attrs tail] head]})))
(exception.def .public nowhere)
(def .public (somewhere parser)
(All (_ a) (-> (Parser a) (Parser a)))
(function (again [attrs input])
(when (//.result parser [attrs input])
{try.#Success [[attrs remaining] output]}
{try.#Success [[attrs remaining] output]}
{try.#Failure error}
(when input
{.#End}
(exception.except ..nowhere [])
{.#Item head tail}
(do try.monad
[[[attrs tail'] output] (again [attrs tail])]
(in [[attrs {.#Item head tail'}]
output]))))))
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