perf: add emitNodes to skip checking text buffer more than needed

lib/saxes.js

@@ -1567,6 +1567,25 @@ class SaxesParser {
     this[nodeType](data);
   }
 
+  /**
+   * Emit any buffered text. Then emit the specified node types.
+   *
+   * @param {string} nodeTypeA The node type to emit.
+   *
+   * @param {string} nodeTypeB The node type to emit.
+   *
+   * @param {string} data The data associated with the node type.
+   *
+   * @private
+   */
+  emitNodes(nodeTypeA, nodeTypeB, data) {
+    if (this.textNode) {
+      this.closeText();
+    }
+    this[nodeTypeA](data);
+    this[nodeTypeB](data);
+  }
+
   resolve(prefix) {
     let uri = this.tag.ns[prefix];
     if (uri !== undefined) {
@@ -1713,16 +1732,16 @@ class SaxesParser {
       this.fail("documents may contain only one root.");
     }
     this.sawRoot = true;
-    this.emitNode("onopentag", tag);
     const { tags } = this;
     if (selfClosing) {
-      this.emitNode("onclosetag", tag);
+      this.emitNodes("onopentag", "onclosetag", tag);
       this.tag = tags[tags.length - 1];
       if (!this.tag) {
         this.closedRoot = true;
       }
     }
     else {
+      this.emitNode("onopentag", tag);
       this.inRoot = true;
       tags.push(tag);
     }