solid-panes/lib/n3Pane.js

Solid-compatible Panes: applets and views for the mashlib and databrowser

"use strict";

/*      Notation3 content Pane
 **
 **  This pane shows the content of a particular RDF resource
 ** or at least the RDF semantics we attribute to that resource,
 ** in generated N3 syntax.
 */
var UI = require('solid-ui');

var ns = UI.ns;
module.exports = {
  icon: UI.icons.originalIconBase + 'w3c/n3_smaller.png',
  name: 'n3',
  audience: [ns.solid('Developer')],
  label: function label(subject, context) {
    var store = context.session.store;

    if ('http://www.w3.org/2007/ont/link#ProtocolEvent' in store.findTypeURIs(subject)) {
      return null;
    }

    var n = store.statementsMatching(undefined, undefined, undefined, subject).length;
    if (n === 0) return null;
    return 'Data (' + n + ') as N3';
  },
  render: function render(subject, context) {
    var myDocument = context.dom;
    var kb = context.session.store;
    var div = myDocument.createElement('div');
    div.setAttribute('class', 'n3Pane'); // Because of smushing etc, this will not be a copy of the original source
    // We could instead either fetch and re-parse the source,
    // or we could keep all the pre-smushed triples.

    var sts = kb.statementsMatching(undefined, undefined, undefined, subject); // @@ slow with current store!

    /*
    var kludge = kb.formula([]) // No features
    for (var i=0; i< sts.length; i++) {
        s = sts[i]
        kludge.add(s.subject, s.predicate, s.object)
    }
    */

    var sz = UI.rdf.Serializer(kb);
    sz.suggestNamespaces(kb.namespaces);
    sz.setBase(subject.uri);
    var str = sz.statementsToN3(sts);
    var pre = myDocument.createElement('PRE');
    pre.appendChild(myDocument.createTextNode(str));
    div.appendChild(pre);
    return div;
  }
};
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