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import { Writable } from 'node:stream';
import { Parser } from 'parse5';
/* eslint-disable unicorn/consistent-function-scoping -- The rule seems to be broken here. */
/**
* Streaming HTML parser with scripting support.
* A [writable stream](https://nodejs.org/api/stream.html#stream_class_stream_writable).
*
* @example
*
* ```js
* const ParserStream = require('parse5-parser-stream');
* const http = require('http');
* const { finished } = require('node:stream');
*
* // Fetch the page content and obtain it's <head> node
* http.get('http://inikulin.github.io/parse5/', res => {
* const parser = new ParserStream();
*
* finished(parser, () => {
* console.log(parser.document.childNodes[1].childNodes[0].tagName); //> 'head'
* });
*
* res.pipe(parser);
* });
* ```
*
*/
export class ParserStream extends Writable {
static getFragmentStream(fragmentContext, options) {
const parser = Parser.getFragmentParser(fragmentContext, options);
const stream = new ParserStream(options, parser);
return stream;
}
/** The resulting document node. */
get document() {
return this.parser.document;
}
getFragment() {
return this.parser.getFragment();
}
/**
* @param options Parsing options.
*/
constructor(options, parser = new Parser(options)) {
super({ decodeStrings: false });
this.parser = parser;
this.lastChunkWritten = false;
this.writeCallback = undefined;
this.pendingHtmlInsertions = [];
const resume = () => {
for (let i = this.pendingHtmlInsertions.length - 1; i >= 0; i--) {
this.parser.tokenizer.insertHtmlAtCurrentPos(this.pendingHtmlInsertions[i]);
}
this.pendingHtmlInsertions.length = 0;
//NOTE: keep parsing if we don't wait for the next input chunk
this.parser.tokenizer.resume(this.writeCallback);
};
const documentWrite = (html) => {
if (!this.parser.stopped) {
this.pendingHtmlInsertions.push(html);
}
};
const scriptHandler = (scriptElement) => {
if (this.listenerCount('script') > 0) {
this.parser.tokenizer.pause();
this.emit('script', scriptElement, documentWrite, resume);
}
};
this.parser.scriptHandler = scriptHandler;
}
//WritableStream implementation
_write(chunk, _encoding, callback) {
if (typeof chunk !== 'string') {
throw new TypeError('Parser can work only with string streams.');
}
this.writeCallback = callback;
this.parser.tokenizer.write(chunk, this.lastChunkWritten, this.writeCallback);
}
// TODO [engine:node@>=16]: Due to issues with Node < 16, we are overriding `end` instead of `_final`.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
end(chunk, encoding, callback) {
this.lastChunkWritten = true;
super.end(chunk || '', encoding, callback);
}
}
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