77 lines
2.2 KiB
JavaScript
77 lines
2.2 KiB
JavaScript
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'use strict';
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var WritableStream = require('stream').Writable,
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inherits = require('util').inherits,
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Parser = require('./index');
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var ParserStream = module.exports = function (options) {
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WritableStream.call(this);
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this.parser = new Parser(options);
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this.lastChunkWritten = false;
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this.writeCallback = null;
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this.pausedByScript = false;
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this.document = this.parser.treeAdapter.createDocument();
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this.pendingHtmlInsertions = [];
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this._resume = this._resume.bind(this);
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this._documentWrite = this._documentWrite.bind(this);
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this._scriptHandler = this._scriptHandler.bind(this);
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this.parser._bootstrap(this.document, null);
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};
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inherits(ParserStream, WritableStream);
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//WritableStream implementation
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ParserStream.prototype._write = function (chunk, encoding, callback) {
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this.writeCallback = callback;
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this.parser.tokenizer.write(chunk.toString('utf8'), this.lastChunkWritten);
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this._runParsingLoop();
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};
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ParserStream.prototype.end = function (chunk, encoding, callback) {
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this.lastChunkWritten = true;
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WritableStream.prototype.end.call(this, chunk || '', encoding, callback);
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};
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//Scriptable parser implementation
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ParserStream.prototype._runParsingLoop = function () {
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this.parser.runParsingLoopForCurrentChunk(this.writeCallback, this._scriptHandler);
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};
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ParserStream.prototype._resume = function () {
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if (!this.pausedByScript)
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throw new Error('Parser was already resumed');
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while (this.pendingHtmlInsertions.length) {
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var html = this.pendingHtmlInsertions.pop();
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this.parser.tokenizer.insertHtmlAtCurrentPos(html);
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}
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this.pausedByScript = false;
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//NOTE: keep parsing if we don't wait for the next input chunk
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if (this.parser.tokenizer.active)
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this._runParsingLoop();
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};
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ParserStream.prototype._documentWrite = function (html) {
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if (!this.parser.stopped)
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this.pendingHtmlInsertions.push(html);
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};
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ParserStream.prototype._scriptHandler = function (scriptElement) {
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if (this.listeners('script').length) {
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this.pausedByScript = true;
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this.emit('script', scriptElement, this._documentWrite, this._resume);
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}
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else
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this._runParsingLoop();
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};
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