Refactored to implement with structuredText

Author: nonara

src/nodes/html.ts

@@ -134,41 +134,6 @@ export default class HTMLElement extends Node {
 		return JSON.stringify(attr.replace(/"/g, '"'));
 	}
 
-  /**
-   * Trim all whitespace except single leading/trailing non-breaking space
-   * @param text string to trim
-   * @returns {string} trimmed value
-   * @private
-   */
-	private trimTextNodeWhitespace(text: string): string {
-    let i = 0;
-    let startPos;
-    let endPos;
-
-    while (i >= 0 && i < text.length) {
-      if (/\S/.test(text[i])) {
-        if (startPos === undefined) {
-          startPos = i;
-          i = text.length;
-        } else {
-          endPos = i;
-          i = void 0;
-        }
-      }
-
-      if (startPos === undefined) i++;
-      else i--;
-    }
-
-    if (startPos === undefined) startPos = 0;
-    if (endPos === undefined) endPos = text.length - 1;
-
-    const hasLeadingSpace = startPos > 0 && /[^\S\r\n]/.test(text[startPos-1]);
-    const hasTrailingSpace = endPos < (text.length - 1) && /[^\S\r\n]/.test(text[endPos+1]);
-
-    return (hasLeadingSpace ? ' ' : '') + text.slice(startPos, endPos + 1) + (hasTrailingSpace ? ' ' : '');
-  }
-
 	/**
 	 * Creates an instance of HTMLElement.
 	 * @param keyAttrs	id and class attribute
@@ -296,7 +261,7 @@ export default class HTMLElement extends Node {
 					// Whitespace node, postponed output
 					currentBlock.prependWhitespace = true;
 				} else {
-					let text = node.text;
+					let text = (<TextNode>node).trimmedText;
 					if (currentBlock.prependWhitespace) {
 						text = ` ${text}`;
 						currentBlock.prependWhitespace = false;
@@ -437,7 +402,7 @@ export default class HTMLElement extends Node {
 				if ((node as TextNode).isWhitespace) {
 					return;
 				}
-				node.rawText = this.trimTextNodeWhitespace(node.rawText);
+				node.rawText = (<TextNode>node).trimmedText;
 			} else if (node.nodeType === NodeType.ELEMENT_NODE) {
 				(node as HTMLElement).removeWhitespace();
 			}

src/nodes/text.ts

@@ -17,6 +17,45 @@ export default class TextNode extends Node {
 	 */
 	public nodeType = NodeType.TEXT_NODE;
 
+	private _trimmedText?: string;
+
+  /**
+   * Returns text with all whitespace trimmed except single leading/trailing non-breaking space
+   */
+	public get trimmedText() {
+	  if (this._trimmedText !== undefined) return this._trimmedText;
+
+	  const text = this.rawText;
+    let i = 0;
+    let startPos;
+    let endPos;
+
+    while (i >= 0 && i < text.length) {
+      if (/\S/.test(text[i])) {
+        if (startPos === undefined) {
+          startPos = i;
+          i = text.length;
+        } else {
+          endPos = i;
+          i = void 0;
+        }
+      }
+
+      if (startPos === undefined) i++;
+      else i--;
+    }
+
+    if (startPos === undefined) startPos = 0;
+    if (endPos === undefined) endPos = text.length - 1;
+
+    const hasLeadingSpace = startPos > 0 && /[^\S\r\n]/.test(text[startPos-1]);
+    const hasTrailingSpace = endPos < (text.length - 1) && /[^\S\r\n]/.test(text[endPos+1]);
+
+    this._trimmedText = (hasLeadingSpace ? ' ' : '') + text.slice(startPos, endPos + 1) + (hasTrailingSpace ? ' ' : '');
+
+    return this._trimmedText;
+  }
+
 	/**
 	 * Get unescaped text value of current node and its children.
 	 * @return {string} text content

test/html.js

@@ -202,7 +202,7 @@ describe('HTML Parser', function () {
 
 				const p = new HTMLElement('p', {}, '', root);
 				p.appendChild(new HTMLElement('h5', {}, ''))
-					.appendChild(new TextNode('123'));
+					.appendChild(Object.assign(new TextNode('123'), { _trimmedText: '123' }));
 
 				root.firstChild.removeWhitespace().should.eql(p);
 			});