It’s similar to P1’s implementation, in that it will pattern match the head of the child element list and pop a known child off and parse it. It’s a common approach in functional languages.
https://github.com/processone/xmpp/blob/master/src/xep0004.erl#L152 Not sure how we’ll do it on the client yet. - Drew > On Feb 14, 2021, at 3:17 PM, Florian Schmaus <f...@geekplace.eu> wrote: > > On 2/11/21 7:09 PM, Drew Varner wrote: >> First time caller, long time listener. >> Some model-driven CODECs may not enforce nor detect order. >> P1’s model-based XMPP CODEC (https://github.com/processone/xmpp) does not >> enforce nor care about the order of the elements. >> ``` >> 2> ReportedFirst = <<"<x xmlns='jabber:x:data' >> type='result'><reported><field var='field-name-one' label='description' >> type='text-single'/></reported><item><field >> var='field-name-two'><value>field-value</value></field></item><item><field >> var='field-name-three'><value>field-value</value></field></item></x>">>. >> <<"<x xmlns='jabber:x:data' type='result'><reported><field >> var='field-name-one' label='description' type='text-single'/"...>> >> 3> ReportedLast = <<"<x xmlns='jabber:x:data' type='result'><item><field >> var='field-name-two'><value>field-value</value></field></item><item><field >> var='field-name-three'><value>field-value</value></field></item><reported><field >> var='field-name-one' label='description' >> type='text-single'/></reported></x>">>. >> <<"<x xmlns='jabber:x:data' type='result'><item><field >> var='field-name-two'><value>field-value</value></field></item><i"...>> >> 4> xmpp:decode(fxml_stream:parse_element(ReportedFirst)) == >> xmpp:decode(fxml_stream:parse_element(ReportedLast)). >> true >> ``` >> There’s no way for them to detect the invalid order in the server code, >> because the CODEC hands them a record/struct. They do write it in the >> correct order because their implementation happened to use lists to element >> refs instead of maps. > > What about the reading side: How does your CODEC assign field types to fields > of incoming data forms? > > - Florian > > > _______________________________________________ > Standards mailing list > Info: https://mail.jabber.org/mailman/listinfo/standards > Unsubscribe: standards-unsubscr...@xmpp.org > _______________________________________________
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