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(.module:
  [lux #*
   [abstract
    [equivalence (#+ Equivalence)]
    [monad (#+ do)]]
   [control
    ["<>" parser
     ["<.>" xml (#+ Parser)]
     ["<.>" text]]]
   [data
    ["." product]
    [format
     ["." xml (#+ XML)]]]]
  ["." // #_
   ["#." time (#+ Time)]
   ["#." build (#+ Build)]])

(type: #export Stamp
  {#time Time
   #build Build})

(def: #export equivalence
  (Equivalence Stamp)
  ($_ product.equivalence
      //time.equivalence
      //build.equivalence
      ))

(def: <timestamp>
  xml.Tag
  ["" "timestamp"])

(def: time_format
  (-> Time XML)
  (|>> //time.format
       #xml.Text
       list
       (#xml.Node ..<timestamp> xml.attributes)))

(def: #export (format (^slots [#time #build]))
  (-> Stamp (List XML))
  (list (..time_format time)
        (//build.format build)))

## (exception: #export (mismatch {expected Instant} {actual Instant})
##   (exception.report
##    ["Expected" (%.instant expected)]
##    ["Actual" (%.instant actual)]))

(def: time_parser
  (Parser Time)
  (do <>.monad
    [_ (<xml>.node <timestamp>)]
    (<text>.embed //time.parser
                  (<xml>.children <xml>.text))))

(def: #export parser
  (Parser Stamp)
  (<>.and (<xml>.somewhere ..time_parser)
          (<xml>.somewhere //build.parser)))