update elements and fix some bugs

lib/src/prism/tests/helper/token-stream-transformer.js

+"use strict";
+
+
+module.exports = {
+        /**
+         * Simplifies the token stream to ease the matching with the expected token stream.
+         *
+         * * Strings are kept as-is
+         * * In arrays each value is transformed individually
+         * * Values that are empty (empty arrays or strings only containing whitespace)
+         *
+         *
+         * @param {Array} tokenStream
+         * @returns {Array.<string[]|Array>}
+         */
+        simplify: function (tokenStream) {
+                if (Array.isArray(tokenStream)) {
+                        return tokenStream
+                                .map(this.simplify.bind(this))
+                                .filter(function (value) {
+                                        return !(Array.isArray(value) && !value.length) && !(typeof value === "string" && !value.trim().length);
+                                }
+                        );
+                }
+                else if (typeof tokenStream === "object") {
+                        return [tokenStream.type, this.simplify(tokenStream.content)];
+                }
+                else {
+                        return tokenStream;
+                }
+        }
+};