--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/elements/graph-view/NodeDisplay.ts	Fri May 05 21:26:36 2023 -0700
@@ -0,0 +1,55 @@
+import { html, TemplateResult } from "lit";
+import { Literal, NamedNode, Term, Util } from "n3";
+import { SuffixLabels } from "../../layout/suffixLabels";
+
+export class NodeDisplay {
+  labels: SuffixLabels;
+  constructor(labels: SuffixLabels) {
+    this.labels = labels;
+  }
+  render(n: Term | NamedNode): TemplateResult {
+    if (Util.isLiteral(n)) {
+      n = n as Literal;
+      let dtPart: any = "";
+      if (n.datatype &&
+        n.datatype.value != "http://www.w3.org/2001/XMLSchema#string" && // boring
+        n.datatype.value !=
+        "http://www.w3.org/1999/02/22-rdf-syntax-ns#langString" //  boring
+      ) {
+        dtPart = html`
+          ^^<span class="literalType"> ${this.render(n.datatype)} </span>
+        `;
+      }
+      return html` <span class="literal">${n.value}${dtPart}</span> `;
+    }
+
+    if (Util.isNamedNode(n)) {
+      n = n as NamedNode;
+      let shortened = false;
+      let uriValue: string = n.value;
+      for (let [long, short] of [
+        ["http://www.w3.org/1999/02/22-rdf-syntax-ns#", "rdf:"],
+        ["http://www.w3.org/2000/01/rdf-schema#", "rdfs:"],
+        ["http://purl.org/dc/elements/1.1/", "dc:"],
+        ["http://www.w3.org/2001/XMLSchema#", "xsd:"],
+      ]) {
+        if (uriValue.startsWith(long)) {
+          uriValue = short + uriValue.substr(long.length);
+          shortened = true;
+          break;
+        }
+      }
+      if (!shortened) {
+        let dn: string | undefined = this.labels.getLabelForNode(uriValue);
+        if (dn === undefined) {
+          throw new Error(`dn=${dn}`);
+        }
+        uriValue = dn;
+      }
+
+      return html` <a class="graphUri" href="${n.value}">${uriValue}</a> `;
+    }
+
+    return html` [${n.termType} ${n.value}] `;
+  }
+}