lib.utils: add parseHtmlEntities

src/lib/utils.js

@@ -279,6 +279,40 @@ async function lookupUser(msg, str, filter) {
   }
 }
 
+// https://stackoverflow.com/a/39243641
+const htmlEntities = {
+  nbsp: " ",
+  cent: "¢",
+  pound: "£",
+  yen: "¥",
+  euro: "€",
+  copy: "©",
+  reg: "®",
+  lt: "<",
+  gt: ">",
+  quot: '"',
+  amp: "&",
+  apos: "'",
+};
+
+function parseHtmlEntities(str) {
+  return str.replace(/&([^;]+);/g, function (entity, entityCode) {
+    var match;
+
+    if (entityCode in htmlEntities) {
+      return htmlEntities[entityCode];
+      /*eslint no-cond-assign: 0*/
+    } else if ((match = entityCode.match(/^#x([\da-fA-F]+)$/))) {
+      return String.fromCharCode(parseInt(match[1], 16));
+      /*eslint no-cond-assign: 0*/
+    } else if ((match = entityCode.match(/^#(\d+)$/))) {
+      return String.fromCharCode(~~match[1]);
+    } else {
+      return entity;
+    }
+  });
+}
+
 module.exports = {
   pastelize,
   getTopColor,
@@ -291,4 +325,5 @@ module.exports = {
   hastebin,
   selectionMessage,
   lookupUser,
+  parseHtmlEntities,
 };