node-html-better-parser

Node HTML Better Parser

Fork from Fast HTML Parser

Fast HTML Parser is a very fast HTML parser. Which will generate a simplified DOM tree, with basic element query support.

Per the design, it intends to parse massive HTML files in lowest price, thus the performance is the top priority. For this reason, some malformatted HTML may not be able to parse correctly, but most usual errors are covered (eg. HTML4 style no closing <li>, <td> etc).

About this fork: I created this fork to provide a simple API for editing the html and especially the attributes.

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Install

npm install --save node-html-better-parser

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Performance

Faster than htmlparser2!

fast-html-parser: 2.18409 ms/file ± 1.37431
high5           : 4.55435 ms/file ± 2.51132
htmlparser      : 27.6920 ms/file ± 171.588
htmlparser2-dom : 6.22320 ms/file ± 3.48772
htmlparser2     : 3.58360 ms/file ± 2.23658
hubbub          : 16.1774 ms/file ± 8.95079
libxmljs        : 7.19406 ms/file ± 7.04495
parse5          : 10.7590 ms/file ± 8.09687

Tested with htmlparser-benchmark.

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Usage

import { parse } from 'node-html-better-parser';

const root = parse('<ul id="list"><li>Hello World</li></ul>');

console.log(root.firstChild.structure);
// ul#list
//   li
//     #text

console.log(root.querySelector('#list'));
// { tagName: 'ul',
//   rawAttrs: 'id="list"',
//   childNodes:
//    [ { tagName: 'li',
//        rawAttrs: '',
//        childNodes: [Object],
//        classNames: [] } ],
//   id: '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>

var HTMLParser = require('node-html-parser');

var root = HTMLParser.parse('<ul id="list"><li>Hello World</li></ul>');

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API

parse(data[, options])

Parse given data, and return root of the generated DOM. The root is actually a fictive node that contains the nodes found in the content provided. The content can be found in root.childNodes, or accessed with root.firstChild if the parsed HTML has a root node (think about <b>siblings</b> <i>nodes</i>).

• data, data to parse
• options, parse options

{
  lowerCaseTagName: false,  // convert tag name to lower case (hurt performance heavily)
  script: false,            // retrieve content in <script> (hurt performance slightly)
  style: false,             // retrieve content in <style> (hurt performance slightly)
  pre: false,               // retrieve content in <pre> (hurt performance slightly)
  comment: false            // retrieve comments (hurt performance slightly)
}

isBlock(node: HTMLElement)

Returns weither the provided node is a block. A node is considered a block is it has a tag represented as block instead of inline in html specs.

HTMLElement

properties

property name	description
text	Get unescaped text value of current node and its children. Like innerText. (slow for the first time)
tagName	Get the tag name of the current element
classNames	Get the classes of the current element
parentNode	Get the parent HTMLNode
rawText	Get escpaed (as-it) text value of current node and its children. May have & in it. (fast)
structuredText	Get structured Text
structure	Get DOM structure
firstChild	Get first child node
lastChild	Get last child node
attributes	Get attributes
rawAttributes	Get escaped (as-it) attributes
innerHTML	Get innerHTML
outerHTML	Get outerHTML

methods

method	parameters	return
trimRight()		Trim element from right (in block) after seeing pattern in a TextNode.
removeWhitespace()		Remove whitespaces in this sub tree.
querySelectorAll(selector: string)	* selector: CSS selector Note: only tagName, #id, .class selectors supported.	Query CSS selector to find matching nodes.
querySelector(selector: string)	* selector: CSS selector Note: only tagName, #id, .class selectors supported. And not behave the same as standard querySelectorAll() as it will stop searching sub tree after find a match.	Query CSS selector to find matching node.
appendChild(node: Node)	* node: HTMLElement or Text node	Append a child node to childNodes
setAttribute(key: string, value: string | null)	* key: The HTML attribute key * value: The HTML attribute name	Set value to key attribute. If value is null, remove the attribute instead.
setAttributes(attributes: Attributes)	* attributes: An object containing the key: value pairs we expect for this node	Replace all the current attributes by the provided attribute set.
removeAttributes(key: string)	* key: The HTML attribute key	Remove the attribute denoted by key.
toString()		Same as outerHTML
set_content(content: string | Node | Node[])	* content: The new content for this node	Set content for this node. Notice: Do not set content of the root node.