refactor(w3c/rfc2119): convert to ES6

src/w3c/rfc2119.js

@@ -0,0 +1,29 @@
+// Module w3c/rfc2119
+// update the 2119 terms section with the terms actually used
+
+import { joinAnd } from "core/utils";
+
+export const name = "w3c/rfc2119";
+
+export function run(conf, doc, cb) {
+  const confo = doc.getElementById("respecRFC2119");
+  if (!confo) {
+    return cb();
+  }
+  // do we have a list of used RFC2119 items in
+  // conf.respecRFC2119
+  const terms = Object.getOwnPropertyNames(conf.respecRFC2119)
+
+  // there are no terms used - remove the clause
+  if (terms.length === 0) {
+    confo.remove();
+    return cb();
+  }
+
+  // put in the 2119 clause and reference
+  const html = joinAnd(terms.sort(), item => `<em class="rfc2119">${item}</em>`);
+  const plural = terms.length > 1;
+  const str = `The key word${plural ? "s " : " "} ${html} ${plural ? "are" : "is"} ${confo.innerHTML}`;
+  confo.innerHTML = str;
+  cb();
+}