Borewit
70 lines
1.9 KiB
TypeScript
70 lines
1.9 KiB
TypeScript
import { EndOfStreamError, ITokenizer } from 'strtok3/core';
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import initDebug from 'debug';
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import { ID3v2Header } from './ID3v2Token.js';
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import { ID3v2Parser } from './ID3v2Parser.js';
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import { ID3v1Parser } from '../id3v1/ID3v1Parser.js';
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import { BasicParser } from '../common/BasicParser.js';
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const debug = initDebug('music-metadata:parser:ID3');
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/**
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* Abstract parser which tries take ID3v2 and ID3v1 headers.
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*/
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export abstract class AbstractID3Parser extends BasicParser {
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public static async startsWithID3v2Header(tokenizer: ITokenizer): Promise<boolean> {
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return (await tokenizer.peekToken(ID3v2Header)).fileIdentifier === 'ID3';
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}
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private id3parser = new ID3v2Parser();
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public async parse(): Promise<void> {
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try {
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await this.parseID3v2();
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} catch (err) {
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if (err instanceof EndOfStreamError) {
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debug(`End-of-stream`);
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} else {
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throw err;
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}
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}
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}
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/**
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* Called after ID3v2 headers are parsed
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*/
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public abstract postId3v2Parse(): Promise<void>;
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protected finalize() {
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return;
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}
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private async parseID3v2(): Promise<void> {
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await this.tryReadId3v2Headers();
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debug('End of ID3v2 header, go to MPEG-parser: pos=%s', this.tokenizer.position);
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await this.postId3v2Parse();
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if (this.options.skipPostHeaders && this.metadata.hasAny()) {
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this.finalize();
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} else {
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const id3v1parser = new ID3v1Parser();
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await id3v1parser.init(this.metadata, this.tokenizer, this.options).parse();
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this.finalize();
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}
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}
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private async tryReadId3v2Headers(): Promise<void> {
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const id3Header = await this.tokenizer.peekToken(ID3v2Header);
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if (id3Header.fileIdentifier === 'ID3') {
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debug('Found ID3v2 header, pos=%s', this.tokenizer.position);
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await this.id3parser.parse(this.metadata, this.tokenizer, this.options);
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return this.tryReadId3v2Headers();
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}
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}
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}
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