added check for nestedness in find-tag-by-name.js

find-tag-by-name.js

@@ -1,8 +1,10 @@
 const indexOfMatch = require("./index-of-match.js");
 const indexOfMatchEnd = require("./index-of-match-end.js");
+const countSubstring = require("./count-substring.js");
 
 function findTagByName(xml, tagName, options) {
   const debug = (options && options.debug) || false;
+  const nested = !(options && typeof options.nested === false);
 
   const startIndex = (options && options.startIndex) || 0;
 
@@ -20,7 +22,22 @@ function findTagByName(xml, tagName, options) {
   if (debug) console.log("[xml-utils] selfClosing:", selfClosing);
 
   if (selfClosing === false) {
-    relativeEnd = indexOfMatchEnd(afterStart, "[ /]" + tagName + ">", 0);
+    // check if tag has subtags with the same name
+    if (nested) {
+      let startIndex = 0;
+      let openings = 1;
+      let closings = 0;
+      while ((relativeEnd = indexOfMatchEnd(afterStart, "[ /]" + tagName + ">", startIndex)) !== -1) {
+        const clip = afterStart.substring(startIndex, relativeEnd + 1);
+        openings += countSubstring(clip, "<" + tagName);
+        closings += countSubstring(clip, "/" + tagName + ">");
+        // we can't have more openings than closings
+        if (closings >= openings) break;
+        startIndex = relativeEnd;
+      }
+    } else {
+      relativeEnd = indexOfMatchEnd(afterStart, "[ /]" + tagName + ">", 0);
+    }
   }
 
   const end = start + tagName.length + relativeEnd + 1;