perf: inline closeText

With the recent changes to the code base, we've reduced the number of locations
where closeText was called to 3. Moreover, inlining closeText allows for some
further optimizations. (We can sometimes avoid concatenating strings.)

lib/saxes.js

@@ -1055,15 +1055,21 @@ class SaxesParser {
     scanLoop:
     while (true) {
       switch (this.getCode()) {
-      case LESS:
+      case LESS: {
         this.state = S_OPEN_WAKA;
-        this.text += chunk.slice(start, this.prevI);
-        if (this.text.length !== 0) {
-          this.closeText();
+        const { text } = this;
+        const slice = chunk.slice(start, this.prevI);
+        if (text.length !== 0) {
+          this.ontext(text + slice);
+          this.text = "";
+        }
+        else if (slice.length !== 0) {
+          this.ontext(slice);
         }
         forbiddenState = FORBIDDEN_START;
         // eslint-disable-next-line no-labels
         break scanLoop;
+      }
       case AMP:
         this.state = S_ENTITY;
         this.entityReturnState = S_TEXT;
@@ -1121,14 +1127,20 @@ class SaxesParser {
     while (true) {
       const code = this.getCode();
       switch (code) {
-      case LESS:
+      case LESS: {
         this.state = S_OPEN_WAKA;
-        this.text += chunk.slice(start, this.prevI);
-        if (this.text.length !== 0) {
-          this.closeText();
+        const { text } = this;
+        const slice = chunk.slice(start, this.prevI);
+        if (text.length !== 0) {
+          this.ontext(text + slice);
+          this.text = "";
+        }
+        else if (slice.length !== 0) {
+          this.ontext(slice);
         }
         // eslint-disable-next-line no-labels
         break outRootLoop;
+      }
       case AMP:
         this.state = S_ENTITY;
         this.entityReturnState = S_TEXT;
@@ -2049,25 +2061,17 @@ class SaxesParser {
         (this.state !== S_TEXT)) {
       this.fail("unexpected end.");
     }
-    if (this.text.length !== 0) {
-      this.closeText();
+    const { text } = this;
+    if (text.length !== 0) {
+      this.ontext(text);
+      this.text = "";
     }
     this.closed = true;
     this.onend();
     this._init(this.opt);
     return this;
   }
 
-  /**
-   * If there's text to emit ``ontext``, emit it.
-   *
-   * @private
-   */
-  closeText() {
-    this.ontext(this.text);
-    this.text = "";
-  }
-
   /**
    * Resolve a namespace prefix.
    *