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Node.js XML to objects streaming edition (htmlparser2)
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| import { Parser } from 'htmlparser2' | |
| import { Transform } from 'stream' | |
| import _ from 'lodash' | |
| export default class XmlParser extends Transform { | |
| constructor (path = [], options = {}) { | |
| super({ | |
| ...options, | |
| objectMode: true | |
| }) | |
| const targetPath = typeof path === 'string' ? path.split('.') : path | |
| const currentPath = [] | |
| let tree | |
| function match () { | |
| if (targetPath.length <= 0) { | |
| return true | |
| } | |
| if (currentPath.length !== targetPath.length) { | |
| return false | |
| } | |
| for (let i = 0; i < targetPath.length; i++) { | |
| const targetTag = targetPath[i] | |
| const currentTag = currentPath[i] | |
| if (currentTag !== targetTag && targetTag !== '*') { | |
| return false | |
| } | |
| } | |
| return true | |
| } | |
| this._parser = new Parser( | |
| { | |
| onopentag: (name, attributes) => { | |
| currentPath.push(name) | |
| if (!tree && match()) { | |
| tree = [] | |
| } | |
| if (tree) { | |
| const node = { | |
| type: 'element', | |
| name, | |
| attributes, | |
| elements: [] | |
| } | |
| const parent = _.last(tree) | |
| if (parent) { | |
| parent.elements.push(node) | |
| } | |
| tree.push(node) | |
| } | |
| }, | |
| ontext: text => { | |
| if (tree) { | |
| _.last(tree).elements.push({ | |
| type: 'text', | |
| text | |
| }) | |
| } | |
| }, | |
| oncomment: comment => { | |
| if (tree) { | |
| _.last(tree).elements.push({ | |
| type: 'comment', | |
| comment | |
| }) | |
| } | |
| }, | |
| onclosetag: () => { | |
| currentPath.pop() | |
| if (tree) { | |
| const node = tree.pop() | |
| if (tree.length <= 0) { | |
| tree = undefined | |
| this.push(node) | |
| } | |
| } | |
| }, | |
| onend: () => { | |
| this._close() | |
| }, | |
| onerror: err => { | |
| this.emit('error', err) | |
| } | |
| }, | |
| { | |
| decodeEntities: true, | |
| xmlMode: true | |
| } | |
| ) | |
| } | |
| _transform (chunk, encoding, callback) { | |
| if (encoding === 'buffer') { | |
| chunk = chunk.toString('utf8') | |
| } | |
| this._parser.write(chunk) | |
| callback() | |
| } | |
| _final (callback) { | |
| this._close = callback | |
| this._parser.end() | |
| } | |
| } |
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