improve performance of attributes reading

Author: amitguptagwl

src/xmlparser/OrderedObjParser.js

@@ -656,7 +656,7 @@ function isItStopNode() {
  */
 function tagExpWithClosingIndex(xmlData, i, closingChar = ">") {
   let attrBoundary = 0;
-  const chars = [];
+  // const chars = [];
   const len = xmlData.length;
   const closeCode0 = closingChar.charCodeAt(0);
   const closeCode1 = closingChar.length > 1 ? closingChar.charCodeAt(1) : -1;
@@ -669,19 +669,11 @@ function tagExpWithClosingIndex(xmlData, i, closingChar = ">") {
     } else if (code === 34 || code === 39) { // " or '
       attrBoundary = code;
     } else if (code === closeCode0) {
-      if (closeCode1 !== -1) {
-        if (xmlData.charCodeAt(index + 1) === closeCode1) {
-          return { data: String.fromCharCode(...chars), index };
-        }
-      } else {
-        return { data: String.fromCharCode(...chars), index };
+      if (closeCode1 === -1 || xmlData.charCodeAt(index + 1) === closeCode1) {
+        const data = xmlData.substring(i, index);
+        return { data: data.replace(/\t/g, " "), index };
       }
-    } else if (code === 9) { // \t
-      chars.push(32); // space
-      continue;
     }
-
-    chars.push(code);
   }
 }