subsrt-ts/dist/format/sub.js

Subtitle JavaScript library and command line tool with no dependencies.

import { buildHandler } from "../handler.js";
const FORMAT_NAME = "sub";
const DEFAULT_FPS = 25;
/**
 * Parses captions in MicroDVD format.
 * @param content The subtitle content
 * @param options Parse options
 * @returns Parsed captions
 * @see https://en.wikipedia.org/wiki/MicroDVD
 */
const parse = (content, options) => {
    var _a;
    options.fps || (options.fps = DEFAULT_FPS);
    const fps = options.fps > 0 ? options.fps : DEFAULT_FPS;
    const captions = [];
    const eol = (_a = options.eol) !== null && _a !== void 0 ? _a : "\r\n";
    const parts = content.split(/\r?\n/);
    for (let i = 0; i < parts.length; i++) {
        const regex = /^\{(\d+)\}\{(\d+)\}(.*)$/;
        const match = regex.exec(parts[i]);
        if (match) {
            const caption = {};
            caption.type = "caption";
            caption.index = i + 1;
            caption.frame = {
                start: parseInt(match[1], 10),
                end: parseInt(match[2], 10),
                count: parseInt(match[2]) - parseInt(match[1], 10),
            };
            caption.start = Math.round(caption.frame.start / fps);
            caption.end = Math.round(caption.frame.end / fps);
            caption.duration = caption.end - caption.start;
            const lines = match[3].split(/\|/);
            caption.content = lines.join(eol);
            caption.text = caption.content.replace(/\{[^}]+\}/g, ""); // {0}{25}{c:$0000ff}{y:b,u}{f:DeJaVuSans}{s:12}Hello!
            captions.push(caption);
            continue;
        }
        if (options.verbose) {
            console.warn("Unknown part", parts[i]);
        }
    }
    return captions;
};
/**
 * Builds captions in MicroDVD format.
 * @param captions The captions to build
 * @param options Build options
 * @returns The built captions string in MicroDVD format
 * @see https://en.wikipedia.org/wiki/MicroDVD
 */
const build = (captions, options) => {
    var _a, _b;
    const fps = ((_a = options.fps) !== null && _a !== void 0 ? _a : 0) > 0 ? options.fps : DEFAULT_FPS;
    let sub = "";
    const eol = (_b = options.eol) !== null && _b !== void 0 ? _b : "\r\n";
    for (const caption of captions) {
        if (!caption.type || caption.type === "caption") {
            const startFrame = typeof caption.frame === "object" && caption.frame.start >= 0 ? caption.frame.start : caption.start * fps;
            const endFrame = typeof caption.frame === "object" && caption.frame.end >= 0 ? caption.frame.end : caption.end * fps;
            const text = caption.text.replace(/\r?\n/, "|");
            sub += `{${startFrame}}{${endFrame}}${text}${eol}`;
            continue;
        }
        if (options.verbose) {
            console.log("SKIP:", caption);
        }
    }
    return sub;
};
/**
 * Detects whether the content is in MicroDVD format.
 * @param content The subtitle content
 * @returns Whether it's MicroDVD format
 */
const detect = (content) => {
    /*
    {7207}{7262}Sister, perfume?
    */
    return /^\{\d+\}\{\d+\}.*/.test(content);
};
export default buildHandler({ name: FORMAT_NAME, build, detect, parse });
export { FORMAT_NAME as name, build, detect, parse };