add method set_content

Author: taoqiufeng

README.md

@@ -33,10 +33,10 @@ Tested with [htmlparser-benchmark](https://github.com/AndreasMadsen/htmlparser-b
 
 ## Usage
 
-```js
-var HTMLParser = require('node-html-parser');
+```ts
+import { parse } from 'node-html-parser';
 
-var root = HTMLParser.parse('<ul id="list"><li>Hello World</li></ul>');
+const root = parse('<ul id="list"><li>Hello World</li></ul>');
 
 console.log(root.firstChild.structure);
 // ul#list
@@ -55,6 +55,14 @@ console.log(root.querySelector('#list'));
 //   classNames: [] }
 console.log(root.toString());
 // <ul id="list"><li>Hello World</li></ul>
+root.set_content('<li>Hello World</li>');
+root.toString();	// <li>Hello World</li>
+```
+
+```js
+var HTMLParser = require('node-html-parser');
+
+var root = HTMLParser.parse('<ul id="list"><li>Hello World</li></ul>');
 ```
 
 ## API
@@ -141,3 +149,5 @@ Get innerHTML.
 
 ### HTMLElement#outerHTML
 Get outerHTML.
+### HTMLElement#set_content(content: string | Node | Node[])
+Set content. **Notice**: Do not set content of the **root** node.

src/index.ts

@@ -208,6 +208,16 @@ export class HTMLElement extends Node {
 		}).join('');
 	}
 
+	set_content(content: string | Node | Node[]) {
+		if (content instanceof Node) {
+			content = [content];
+		} else if (typeof content == 'string') {
+			const r = parse(content);
+			content = r.childNodes.length ? r.childNodes : [new TextNode(content)];
+		}
+		this.childNodes = content;
+	}
+
 	get outerHTML() {
 		return this.toString();
 	}
@@ -237,9 +247,9 @@ export class HTMLElement extends Node {
 		return this;
 	}
 	/**
- * Get DOM structure
- * @return {string} strucutre
- */
+	 * Get DOM structure
+	 * @return {string} strucutre
+	 */
 	get structure() {
 		const res = [] as string[];
 		let indention = 0;

test/html.js

@@ -249,11 +249,35 @@ describe('HTML Parser', function () {
 			});
 
 		});
+		describe('#set_content', function () {
+
+			it('set content string', function () {
+				var root = parseHTML('<div></div>');
+				root.childNodes[0].set_content('<span><div>abc</div>bla</span>');
+				root.toString().should.eql('<div><span><div>abc</div>bla</span></div>');
+			});
+			it('set content nodes', function () {
+				var root = parseHTML('<div></div>');
+				root.childNodes[0].set_content(parseHTML('<span><div>abc</div>bla</span>').childNodes);
+				root.toString().should.eql('<div><span><div>abc</div>bla</span></div>');
+			});
+			it('set content node', function () {
+				var root = parseHTML('<div></div>');
+				root.childNodes[0].set_content(parseHTML('<span><div>abc</div>bla</span>').childNodes[0]);
+				root.toString().should.eql('<div><span><div>abc</div>bla</span></div>');
+			});
+			it('set content text', function () {
+				var root = parseHTML('<div></div>');
+				root.childNodes[0].set_content('abc');
+				root.toString().should.eql('<div>abc</div>');
+			});
+
+		});
 
 	});
 
 	describe('stringify', function () {
-		describe('toString', function () {
+		describe('#toString()', function () {
 			const html = '<p id="id" data-feidao-actions="ssss"><a class=\'cls\'>Hello</a><ul><li>aaaaa</li></ul><span>bbb</span></p>';
 			const root = parseHTML(html);
 			root.toString().should.eql(html)