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node_modules/
dist/
release/*.zip
release/*.zip.sha256
coverage/
playwright-report/
test-results/
*.tsbuildinfo
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.npmrc
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@add-ideas:registry=https://git.add-ideas.de/api/packages/lotobo/npm/
CHANGELOG.md
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# Changelog
## 0.1.0 - 2026-09-01
- Added bounded SRT, WebVTT and ASS parsing, cue editing and explicit conversion.
- Added timing shifts, stretching, frame-rate conversion and configurable
overlap, duration, layout and reading-speed diagnostics.
- Added local revision comparison and browser-native playback with bounded
waveform extraction.
- Added Toolbox integration, offline shell, cross-browser tests and deterministic
release packaging.
CONTRIBUTING.md
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# Contributing
Run `npm ci`, `npm run check`, and `npm run test:browser` before proposing a change. Keep processing local, preserve explicit limits, and include fixtures for every parser boundary.
LICENSE
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.
LICENSES/README.md
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# Licences
The application is GPL-3.0-or-later. Generated release artifacts include an exact runtime dependency licence inventory in `npm-runtime-licenses.txt`.
README.md
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# Subtitle Tools
Edit, validate, synchronize, compare, and convert subtitle files locally in the
browser. Subtitle Tools is an independently versioned application in the
[add·ideas Toolbox](https://git.add-ideas.de/lotobo/toolbox-portal).
## Version 0.1 scope
- Bounded SRT, WebVTT, ASS and legacy SSA-compatible dialogue parsing
- Cue timeline, direct text/timestamp editing and configurable diagnostics for
overlaps, order, duration, reading speed, line count and line length
- Shift and anchor-based stretch operations, negative-time protection and
explicit source/target frame-rate conversion
- SRT, WebVTT and ASS serialization with format-specific preservation where
possible and a visible cross-format loss warning
- Deterministic index-aligned revision comparison
- Immediate browser-native audio/video playback plus bounded local waveform peak
extraction and subtitle-start markers
- UTF-8, UTF-16 LE/BE and ISO-8859-1 file decoding
All source, media and generated output stays in the current browser. The app
makes no external request. Validation is configurable editorial guidance, not a
broadcast, accessibility, or legal compliance certificate. Version 0.1 does not
perform speech recognition, automatic alignment, semantic revision matching, or
pixel-perfect ASS rendering.
## Development
Requires Node.js 22 and npm 11.
```sh
npm ci
npm run check
npm run test:browser
```
## Release
`npm run release:artifact` creates the deterministic
`release/subtitle-tools-0.1.0.zip` and checksum sidecar.
## Licence
GPL-3.0-or-later. Runtime dependencies retain their own licences; see
[THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).
SECURITY.md
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# Security
Please report vulnerabilities privately to the repository owner. Do not attach sensitive source files to public issues. Imported inputs are untrusted; parsers must remain bounded and must not execute active content or fetch external resources.
SOURCE.md
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# Corresponding source
The corresponding source for Subtitle Tools 0.1.0 is available at:
https://git.add-ideas.de/lotobo/subtitle-tools/src/tag/v0.1.0
Build with Node.js 22, npm 11, `npm ci`, and `npm run release:artifact`.
THIRD_PARTY_NOTICES.md
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# Third-party notices
Subtitle Tools 0.1.0 directly depends on these runtime packages:
| Package | Pinned version | Declared licence |
| -------------------------------- | -------------: | ---------------- |
| `@add-ideas/toolbox-contract` | 0.2.3 | Apache-2.0 |
| `@add-ideas/toolbox-helpers` | 0.1.0 | GPL-3.0-or-later |
| `@add-ideas/toolbox-shell-react` | 0.2.3 | Apache-2.0 |
| `react` | 19.2.8 | MIT |
| `react-dom` | 19.2.8 | MIT |
This table covers direct production dependencies, not transitive packages or development tooling. During a release build, the exact non-development dependency tree and discovered licence texts are generated from the lockfile into `LICENSES/npm-runtime-licenses.txt` and included in the release ZIP. Copyright and licence terms remain with their respective authors.
docs/ACCESSIBILITY.md
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# Accessibility
The application uses labelled native controls, keyboard-reachable tabs and cue
buttons, visible focus indicators, text alternatives for waveform content, and
light, dark and system themes. Colour is not the only carrier for issue level.
The cue and issue views cap rendered rows to keep navigation responsive while
the complete bounded document remains included in validation and export.
The waveform is an optional visual aid: all timing edits use numeric controls and
do not require pointer input. Reduced-motion preferences disable transitions.
docs/ARCHITECTURE.md
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# Architecture
Subtitle Tools is a relocatable React application with a framework-independent
TypeScript subtitle model. The parser first applies byte/text and line bounds,
then produces one normalized cue model for SRT, WebVTT and ASS. Operations return
new documents instead of mutating parser state. Serializers are format-specific;
cross-format export deliberately exposes its preservation boundary.
Parsing and timing transformations are synchronous in v0.1 and therefore capped
at 4,000,000 UTF-16 units, 250,000 units per physical line and 100,000 cues. The
editor renders at most 10,000 cue rows and 2,000 issue rows, while validation and
export still cover the complete bounded document. Revision comparison is
index-aligned and linear rather than an unbounded semantic diff.
The optional waveform component uses browser-native media decoding, keeps at
most 2,000 peak buckets and accepts no more than 128 MiB or four decoded hours.
It does not run a codec, speech-recognition model or network service.
docs/PRIVACY-SECURITY.md
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# Privacy and security
Subtitle and media files are read only after direct selection and stay in page
memory. No telemetry, analytics, account, upload, external font, codec, model or
other network destination exists. The production policy uses
`connect-src 'self'`; browser tests fail on non-local requests.
Subtitle text is rendered by React as text, not interpreted as HTML. ASS override
codes and WebVTT tags are preserved as inert source. Exports are downloads chosen
by the user. Browser-native media playback and Web Audio decoding inherit browser
codec support and may allocate substantial memory inside the documented bounds.
Validation findings are editorial signals. They are not proof of accessibility,
broadcast conformance, synchronization quality or legal compliance. Cross-format
conversion can discard styles, positioning, regions, comments and metadata.
eslint.config.mjs
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import js from "@eslint/js";
import globals from "globals";
import reactHooks from "eslint-plugin-react-hooks";
import reactRefresh from "eslint-plugin-react-refresh";
import tseslint from "typescript-eslint";
export default tseslint.config(
{
ignores: [
"dist",
"release",
"coverage",
"test-results",
"playwright-report",
],
},
{
extends: [js.configs.recommended, ...tseslint.configs.recommended],
files: ["**/*.{ts,tsx}"],
languageOptions: {
ecmaVersion: 2023,
globals: { ...globals.browser, ...globals.worker },
},
plugins: { "react-hooks": reactHooks, "react-refresh": reactRefresh },
rules: {
...reactHooks.configs.recommended.rules,
"react-refresh/only-export-components": [
"warn",
{ allowConstantExport: true },
],
},
},
{
files: ["scripts/**/*.mjs", "playwright.config.ts"],
languageOptions: { globals: globals.node },
},
);
index.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta
name="description"
content="Edit, validate, synchronize, compare, and convert subtitles locally."
/>
<link rel="icon" type="image/svg+xml" href="./favicon.svg" />
<link rel="manifest" href="./manifest.webmanifest" />
<meta name="theme-color" content="#29255f" />
<title>Subtitle Tools</title>
</head>
<body>
<div id="root"></div>
<script type="module" src="./src/main.tsx"></script>
</body>
</html>
package-lock.json
Generated
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package.json
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{
"name": "subtitle-tools",
"version": "0.1.0",
"description": "Edit, validate, synchronize, compare, and convert subtitles locally in the browser.",
"license": "GPL-3.0-or-later",
"author": "Albrecht Degering",
"repository": {
"type": "git",
"url": "git+https://git.add-ideas.de/lotobo/subtitle-tools.git"
},
"homepage": "https://git.add-ideas.de/lotobo/subtitle-tools",
"bugs": {
"url": "https://git.add-ideas.de/lotobo/subtitle-tools/issues"
},
"private": true,
"type": "module",
"engines": {
"node": ">=22"
},
"scripts": {
"predev": "npm run manifest:generate",
"dev": "vite",
"prebuild": "npm run release:prepare && npm run manifest:generate",
"build": "tsc -b && vite build",
"preview": "vite preview",
"typecheck": "tsc -b --pretty false",
"lint": "eslint . --max-warnings=0",
"format": "prettier --write .",
"format:check": "prettier --check .",
"test": "vitest run",
"test:watch": "vitest",
"test:browser": "playwright test",
"manifest:generate": "node scripts/generate-toolbox-manifest.mjs",
"manifest:check": "node scripts/generate-toolbox-manifest.mjs --check",
"release:prepare": "node scripts/prepare-release-files.mjs",
"toolbox:check": "toolbox-check dist",
"package:release": "node scripts/package-release.mjs",
"check": "npm run manifest:check && npm run typecheck && npm run lint && npm run format:check && npm run test && npm run build && npm run toolbox:check",
"release:artifact": "npm run check && npm run test:browser && npm run package:release -- --force"
},
"dependencies": {
"@add-ideas/toolbox-contract": "0.2.3",
"@add-ideas/toolbox-helpers": "0.1.0",
"@add-ideas/toolbox-shell-react": "0.2.3",
"react": "19.2.8",
"react-dom": "19.2.8"
},
"devDependencies": {
"@add-ideas/toolbox-testkit": "0.2.3",
"@eslint/js": "10.0.1",
"@playwright/test": "1.62.1",
"@testing-library/jest-dom": "6.9.1",
"@testing-library/react": "16.3.2",
"@testing-library/user-event": "14.6.1",
"@types/node": "25.9.5",
"@types/react": "19.2.17",
"@types/react-dom": "19.2.5",
"@vitejs/plugin-react": "6.0.3",
"eslint": "10.7.0",
"eslint-plugin-react-hooks": "7.1.1",
"eslint-plugin-react-refresh": "0.5.2",
"globals": "17.7.0",
"jsdom": "29.1.1",
"prettier": "3.9.5",
"typescript": "6.0.3",
"typescript-eslint": "8.64.0",
"vite": "8.2.2",
"vitest": "4.1.11"
},
"packageManager": "npm@11.17.0"
}
playwright.config.ts
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import { defineConfig, devices } from "@playwright/test";
export default defineConfig({
testDir: "./tests/browser",
fullyParallel: false,
workers: 1,
timeout: 120_000,
expect: { timeout: 10_000 },
reporter: [["list"]],
use: { baseURL: "http://127.0.0.1:4197", trace: "retain-on-failure" },
webServer: {
command: "npm run build && node scripts/serve-test.mjs",
url: "http://127.0.0.1:4197",
reuseExistingServer: !process.env.CI,
timeout: 180_000,
},
projects: [
{ name: "chromium", use: { ...devices["Desktop Chrome"] } },
{ name: "firefox", use: { ...devices["Desktop Firefox"] } },
],
});
public/CHANGELOG.md
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# Changelog
## 0.1.0 - 2026-09-01
- Added bounded SRT, WebVTT and ASS parsing, cue editing and explicit conversion.
- Added timing shifts, stretching, frame-rate conversion and configurable
overlap, duration, layout and reading-speed diagnostics.
- Added local revision comparison and browser-native playback with bounded
waveform extraction.
- Added Toolbox integration, offline shell, cross-browser tests and deterministic
release packaging.
public/CONTRIBUTING.md
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# Contributing
Run `npm ci`, `npm run check`, and `npm run test:browser` before proposing a change. Keep processing local, preserve explicit limits, and include fixtures for every parser boundary.
public/LICENSE
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@@ -0,0 +1,674 @@
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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The licenses for most software and other practical works are designed
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software for all its users. We, the Free Software Foundation, use the
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When we speak of free software, we are referring to freedom, not
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All other non-permissive additional terms are considered "further
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8. Termination.
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You are not required to accept this License in order to receive or
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work thus licensed is called the contributor's "contributor version".
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Program, unless a warranty or assumption of liability accompanies a
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.
public/LICENSES/README.md
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# Licences
The application is GPL-3.0-or-later. Generated release artifacts include an exact runtime dependency licence inventory in `npm-runtime-licenses.txt`.
public/LICENSES/npm-runtime-licenses.txt
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public/README.md
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# Subtitle Tools
Edit, validate, synchronize, compare, and convert subtitle files locally in the
browser. Subtitle Tools is an independently versioned application in the
[add·ideas Toolbox](https://git.add-ideas.de/lotobo/toolbox-portal).
## Version 0.1 scope
- Bounded SRT, WebVTT, ASS and legacy SSA-compatible dialogue parsing
- Cue timeline, direct text/timestamp editing and configurable diagnostics for
overlaps, order, duration, reading speed, line count and line length
- Shift and anchor-based stretch operations, negative-time protection and
explicit source/target frame-rate conversion
- SRT, WebVTT and ASS serialization with format-specific preservation where
possible and a visible cross-format loss warning
- Deterministic index-aligned revision comparison
- Immediate browser-native audio/video playback plus bounded local waveform peak
extraction and subtitle-start markers
- UTF-8, UTF-16 LE/BE and ISO-8859-1 file decoding
All source, media and generated output stays in the current browser. The app
makes no external request. Validation is configurable editorial guidance, not a
broadcast, accessibility, or legal compliance certificate. Version 0.1 does not
perform speech recognition, automatic alignment, semantic revision matching, or
pixel-perfect ASS rendering.
## Development
Requires Node.js 22 and npm 11.
```sh
npm ci
npm run check
npm run test:browser
```
## Release
`npm run release:artifact` creates the deterministic
`release/subtitle-tools-0.1.0.zip` and checksum sidecar.
## Licence
GPL-3.0-or-later. Runtime dependencies retain their own licences; see
[THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).
public/SECURITY.md
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# Security
Please report vulnerabilities privately to the repository owner. Do not attach sensitive source files to public issues. Imported inputs are untrusted; parsers must remain bounded and must not execute active content or fetch external resources.
public/SOURCE.md
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# Corresponding source
The corresponding source for Subtitle Tools 0.1.0 is available at:
https://git.add-ideas.de/lotobo/subtitle-tools/src/tag/v0.1.0
Build with Node.js 22, npm 11, `npm ci`, and `npm run release:artifact`.
public/THIRD_PARTY_NOTICES.md
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# Third-party notices
Subtitle Tools 0.1.0 directly depends on these runtime packages:
| Package | Pinned version | Declared licence |
| -------------------------------- | -------------: | ---------------- |
| `@add-ideas/toolbox-contract` | 0.2.3 | Apache-2.0 |
| `@add-ideas/toolbox-helpers` | 0.1.0 | GPL-3.0-or-later |
| `@add-ideas/toolbox-shell-react` | 0.2.3 | Apache-2.0 |
| `react` | 19.2.8 | MIT |
| `react-dom` | 19.2.8 | MIT |
This table covers direct production dependencies, not transitive packages or development tooling. During a release build, the exact non-development dependency tree and discovered licence texts are generated from the lockfile into `LICENSES/npm-runtime-licenses.txt` and included in the release ZIP. Copyright and licence terms remain with their respective authors.
public/docs/ACCESSIBILITY.md
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# Accessibility
The application uses labelled native controls, keyboard-reachable tabs and cue
buttons, visible focus indicators, text alternatives for waveform content, and
light, dark and system themes. Colour is not the only carrier for issue level.
The cue and issue views cap rendered rows to keep navigation responsive while
the complete bounded document remains included in validation and export.
The waveform is an optional visual aid: all timing edits use numeric controls and
do not require pointer input. Reduced-motion preferences disable transitions.
public/docs/ARCHITECTURE.md
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# Architecture
Subtitle Tools is a relocatable React application with a framework-independent
TypeScript subtitle model. The parser first applies byte/text and line bounds,
then produces one normalized cue model for SRT, WebVTT and ASS. Operations return
new documents instead of mutating parser state. Serializers are format-specific;
cross-format export deliberately exposes its preservation boundary.
Parsing and timing transformations are synchronous in v0.1 and therefore capped
at 4,000,000 UTF-16 units, 250,000 units per physical line and 100,000 cues. The
editor renders at most 10,000 cue rows and 2,000 issue rows, while validation and
export still cover the complete bounded document. Revision comparison is
index-aligned and linear rather than an unbounded semantic diff.
The optional waveform component uses browser-native media decoding, keeps at
most 2,000 peak buckets and accepts no more than 128 MiB or four decoded hours.
It does not run a codec, speech-recognition model or network service.
public/docs/PRIVACY-SECURITY.md
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# Privacy and security
Subtitle and media files are read only after direct selection and stay in page
memory. No telemetry, analytics, account, upload, external font, codec, model or
other network destination exists. The production policy uses
`connect-src 'self'`; browser tests fail on non-local requests.
Subtitle text is rendered by React as text, not interpreted as HTML. ASS override
codes and WebVTT tags are preserved as inert source. Exports are downloads chosen
by the user. Browser-native media playback and Web Audio decoding inherit browser
codec support and may allocate substantial memory inside the documented bounds.
Validation findings are editorial signals. They are not proof of accessibility,
broadcast conformance, synchronization quality or legal compliance. Cross-format
conversion can discard styles, positioning, regions, comments and metadata.
public/favicon.svg
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" role="img" aria-label="Subtitle Tools"><path fill="#5b4ec4" d="M11 4h30l12 12v44H11z"/><path fill="#fff" opacity=".28" d="M41 4v14h12"/><path fill="#fff" d="M17 31h12v5H22v7h7v5H17zm18 0h12v5h-7v7h7v5H35z"/></svg>
Side by Side

After

Width:  |  Height:  |  Size: 274 B

public/manifest.webmanifest
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{
"name": "Subtitle Tools",
"short_name": "Subtitles",
"description": "Edit, validate, synchronize, compare, and convert subtitles locally.",
"start_url": "./",
"scope": "./",
"display": "standalone",
"background_color": "#f6f7fb",
"theme_color": "#29255f",
"icons": [
{
"src": "./favicon.svg",
"sizes": "any",
"type": "image/svg+xml",
"purpose": "any maskable"
}
]
}
public/sw.js
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const CACHE_PREFIX = "subtitle-tools-shell-";
const CACHE_NAME = CACHE_PREFIX + "0.1.0";
const CORE = ["./", "./manifest.webmanifest", "./favicon.svg"];
self.addEventListener("install", (event) => {
event.waitUntil(
caches.open(CACHE_NAME).then(async (cache) => {
await cache.addAll(CORE);
const html = await (await fetch("./")).text();
const assets = [...html.matchAll(/(?:src|href)="(\.\/assets\/[^"]+)"/g)]
.map((match) => match[1])
.filter(Boolean);
await cache.addAll(assets);
}),
);
self.skipWaiting();
});
self.addEventListener("activate", (event) => {
event.waitUntil(
caches
.keys()
.then((keys) =>
Promise.all(
keys
.filter((key) => key.startsWith(CACHE_PREFIX) && key !== CACHE_NAME)
.map((key) => caches.delete(key)),
),
)
.then(() => self.clients.claim()),
);
});
self.addEventListener("fetch", (event) => {
if (event.request.method !== "GET") return;
const url = new URL(event.request.url);
if (
url.origin !== self.location.origin ||
!url.pathname.startsWith(new URL(self.registration.scope).pathname)
)
return;
event.respondWith(
caches.match(event.request).then(
(cached) =>
cached ??
fetch(event.request).then((response) => {
if (response.ok) {
const copy = response.clone();
void caches
.open(CACHE_NAME)
.then((cache) => cache.put(event.request, copy));
}
return response;
}),
),
);
});
public/toolbox-app.json
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{
"$schema": "https://git.add-ideas.de/lotobo/toolbox-sdk/raw/branch/main/schemas/toolbox-app.v1.schema.json",
"schemaVersion": 1,
"id": "de.add-ideas.subtitle-tools",
"name": "Subtitle Tools",
"version": "0.1.0",
"description": "Edit, validate, synchronize, compare, and convert subtitles locally.",
"entry": "./",
"icon": "./favicon.svg",
"categories": ["media", "text", "productivity"],
"tags": ["subtitles", "captions", "srt", "webvtt", "ass", "timing"],
"integration": {
"contextVersion": 1,
"launchModes": ["navigate", "new-tab"],
"embedding": "unsupported"
},
"requirements": {
"secureContext": false,
"workers": false,
"indexedDb": false,
"crossOriginIsolated": false,
"topLevelContext": false
},
"privacy": {
"processing": "local",
"fileUploads": true,
"telemetry": false,
"label": "Inputs stay in this browser; nothing is uploaded."
},
"source": {
"repository": "https://git.add-ideas.de/lotobo/subtitle-tools",
"license": "GPL-3.0-or-later"
},
"actions": [
{
"id": "source",
"label": "Source",
"url": "https://git.add-ideas.de/lotobo/subtitle-tools"
}
]
}
scripts/generate-toolbox-manifest.mjs
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import { readFile, writeFile } from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { format } from "prettier";
const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
const sourcePath = path.join(root, "src/toolbox/manifest.source.json");
const outputPath = path.join(root, "public/toolbox-app.json");
const source = JSON.parse(await readFile(sourcePath, "utf8"));
const pkg = JSON.parse(await readFile(path.join(root, "package.json"), "utf8"));
const versionSource = await readFile(path.join(root, "src/version.ts"), "utf8");
const appVersion = /^export const APP_VERSION = "([^"]+)";$/mu.exec(
versionSource,
)?.[1];
const repository = "https://git.add-ideas.de/lotobo/" + pkg.name;
if (source.version !== pkg.version || appVersion !== pkg.version)
throw new Error("Version identity drift");
if (
source.id !== "de.add-ideas." + pkg.name ||
source.source?.repository !== repository ||
source.source?.license !== "GPL-3.0-or-later"
)
throw new Error("Manifest source identity is invalid");
const serialized = await format(JSON.stringify(source), {
filepath: outputPath,
});
if (process.argv.includes("--check")) {
if ((await readFile(outputPath, "utf8").catch(() => "")) !== serialized)
throw new Error("public/toolbox-app.json is stale");
console.log("Toolbox manifest is synchronized");
} else {
await writeFile(outputPath, serialized);
console.log("Generated public/toolbox-app.json");
}
scripts/package-release.mjs
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#!/usr/bin/env node
import { createHash } from "node:crypto";
import { execFile } from "node:child_process";
import {
access,
chmod,
copyFile,
cp,
lstat,
mkdir,
mkdtemp,
readFile,
readdir,
rename,
rm,
utimes,
writeFile,
} from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import { promisify } from "node:util";
import { fileURLToPath } from "node:url";
const execute = promisify(execFile);
const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
const pkg = JSON.parse(await readFile(path.join(root, "package.json"), "utf8"));
const argument = (name, fallback) => {
const index = process.argv.indexOf(name);
return index >= 0 ? process.argv[index + 1] : fallback;
};
const output = path.resolve(
root,
argument("--output", "release/" + pkg.name + "-" + pkg.version + ".zip"),
);
const checksumOutput = output + ".sha256";
const force = process.argv.includes("--force");
if (
path.extname(output).toLowerCase() !== ".zip" ||
output === root ||
output === path.parse(output).root
)
throw new Error("Unsafe release target");
const exists = (file) =>
access(file).then(
() => true,
() => false,
);
if (!force && ((await exists(output)) || (await exists(checksumOutput))))
throw new Error("Release output exists");
const input = path.join(root, "dist");
for (const name of [
"index.html",
"manifest.webmanifest",
"sw.js",
"toolbox-app.json",
"favicon.svg",
"README.md",
"CHANGELOG.md",
"CONTRIBUTING.md",
"LICENSE",
"SECURITY.md",
"SOURCE.md",
"THIRD_PARTY_NOTICES.md",
"LICENSES/README.md",
"LICENSES/npm-runtime-licenses.txt",
"docs/ACCESSIBILITY.md",
"docs/ARCHITECTURE.md",
"docs/PRIVACY-SECURITY.md",
]) {
const details = await lstat(path.join(input, name)).catch(() => null);
if (!details?.isFile() || details.isSymbolicLink())
throw new Error("Missing release file: " + name);
}
const manifest = JSON.parse(
await readFile(path.join(input, "toolbox-app.json"), "utf8"),
);
const repository = "https://git.add-ideas.de/lotobo/" + pkg.name;
if (
manifest.id !== "de.add-ideas." + pkg.name ||
manifest.version !== pkg.version ||
manifest.entry !== "./" ||
manifest.icon !== "./favicon.svg" ||
manifest.source?.repository !== repository
)
throw new Error("Packaged manifest identity is invalid");
if (
/\b(?:src|href)=["']\//iu.test(
await readFile(path.join(input, "index.html"), "utf8"),
)
)
throw new Error("Root-absolute asset reference");
async function collect(directory, prefix = "") {
const files = [];
for (const entry of (await readdir(directory, { withFileTypes: true })).sort(
(a, b) => a.name.localeCompare(b.name),
)) {
const absolute = path.join(directory, entry.name);
const relative = prefix ? prefix + "/" + entry.name : entry.name;
if (entry.isSymbolicLink())
throw new Error("Symlink in release: " + relative);
if (entry.isDirectory()) files.push(...(await collect(absolute, relative)));
else if (entry.isFile()) files.push({ absolute, relative });
else throw new Error("Unsupported release entry: " + relative);
}
return files;
}
const sourceFiles = await collect(input);
for (const file of sourceFiles)
if (
file.relative.endsWith(".map") ||
/(?:^|\/)(?:\.env(?:\.|$)|id_rsa|id_ed25519|.*\.pem$|.*\.key$)/iu.test(
file.relative,
) ||
file.relative.split("/").includes("..")
)
throw new Error("Forbidden release entry: " + file.relative);
await mkdir(path.dirname(output), { recursive: true });
const stagingRoot = await mkdtemp(
path.join(os.tmpdir(), pkg.name + "-release-"),
);
const publicationRoot = await mkdtemp(
path.join(path.dirname(output), "." + pkg.name + "-publish-"),
);
const stagedTree = path.join(stagingRoot, "tree");
const stagedArchive = path.join(stagingRoot, path.basename(output));
try {
await cp(input, stagedTree, { recursive: true });
const timestamp = new Date("1980-01-01T00:00:00.000Z");
for (const file of await collect(stagedTree)) {
await chmod(file.absolute, 0o644);
await utimes(file.absolute, timestamp, timestamp);
}
await execute(
"zip",
[
"-X",
"-q",
"-9",
stagedArchive,
...sourceFiles.map((file) => file.relative),
],
{
cwd: stagedTree,
env: { ...process.env, TZ: "UTC" },
maxBuffer: 1024 * 1024,
},
);
const archive = await readFile(stagedArchive);
const digest = createHash("sha256").update(archive).digest("hex");
const stagedChecksum = stagedArchive + ".sha256";
await writeFile(stagedChecksum, digest + " " + path.basename(output) + "\n");
const publicationArchive = path.join(publicationRoot, path.basename(output));
const publicationChecksum = publicationArchive + ".sha256";
await copyFile(stagedArchive, publicationArchive);
await copyFile(stagedChecksum, publicationChecksum);
if (force) {
await rm(output, { force: true });
await rm(checksumOutput, { force: true });
}
await rename(publicationArchive, output);
await rename(publicationChecksum, checksumOutput);
console.log("Created " + path.relative(root, output) + "\nSHA-256 " + digest);
} finally {
await rm(stagingRoot, { recursive: true, force: true });
await rm(publicationRoot, { recursive: true, force: true });
}
scripts/prepare-release-files.mjs
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import { cp, mkdir, readFile, readdir, rm, writeFile } from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";
const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
const destination = path.join(root, "public");
for (const name of [
"LICENSE",
"README.md",
"CHANGELOG.md",
"CONTRIBUTING.md",
"SECURITY.md",
"SOURCE.md",
"THIRD_PARTY_NOTICES.md",
]) {
await readFile(path.join(root, name));
await cp(path.join(root, name), path.join(destination, name));
}
for (const directory of ["LICENSES", "docs"]) {
const output = path.join(destination, directory);
await rm(output, { recursive: true, force: true });
await cp(path.join(root, directory), output, { recursive: true });
}
const lock = JSON.parse(
await readFile(path.join(root, "package-lock.json"), "utf8"),
);
const sections = [];
for (const [location, locked] of Object.entries(lock.packages ?? {}).sort(
([a], [b]) => a.localeCompare(b),
)) {
if (!location.includes("node_modules/") || locked.dev === true) continue;
const packageDirectory = path.join(root, location);
const details = JSON.parse(
await readFile(path.join(packageDirectory, "package.json"), "utf8"),
);
const candidates = (await readdir(packageDirectory))
.filter((name) => /^(?:licen[cs]e|copying|notice)(?:\.|$)/iu.test(name))
.sort();
const texts = [];
for (const candidate of candidates) {
try {
texts.push(
"--- " +
candidate +
" ---\n" +
(await readFile(path.join(packageDirectory, candidate), "utf8")),
);
} catch {
/* directory */
}
}
sections.push(
"=".repeat(78) +
"\n" +
details.name +
"@" +
details.version +
"\nDeclared licence: " +
(details.license ?? locked.license ?? "See upstream") +
"\n" +
"=".repeat(78) +
"\n" +
(texts.join("\n\n") || "See upstream package metadata."),
);
}
await mkdir(path.join(destination, "LICENSES"), { recursive: true });
await writeFile(
path.join(destination, "LICENSES/npm-runtime-licenses.txt"),
sections.join("\n\n").trimEnd() + "\n",
);
console.log("Prepared release documentation");
scripts/serve-test.mjs
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import { createServer } from "node:http";
import { readFile, stat } from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";
const root = path.resolve(
path.dirname(fileURLToPath(import.meta.url)),
"..",
"dist",
);
const prefix = "/deep/nested/subtitle/";
const types = new Map([
[".css", "text/css; charset=utf-8"],
[".html", "text/html; charset=utf-8"],
[".js", "text/javascript; charset=utf-8"],
[".json", "application/json; charset=utf-8"],
[".webmanifest", "application/manifest+json; charset=utf-8"],
[".svg", "image/svg+xml"],
[".md", "text/markdown; charset=utf-8"],
[".txt", "text/plain; charset=utf-8"],
[".wasm", "application/wasm"],
[".png", "image/png"],
[".jpg", "image/jpeg"],
[".webp", "image/webp"],
]);
const headers = {
"Content-Security-Policy":
"default-src 'self'; base-uri 'self'; object-src 'none'; frame-ancestors 'none'; form-action 'self'; script-src 'self' 'wasm-unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; media-src 'self' blob:; connect-src 'self'; worker-src 'self' blob:; manifest-src 'self'",
"Cross-Origin-Opener-Policy": "same-origin",
"Cross-Origin-Resource-Policy": "same-origin",
"Permissions-Policy":
"camera=(), microphone=(), geolocation=(), usb=(), payment=()",
"Referrer-Policy": "no-referrer",
"X-Content-Type-Options": "nosniff",
};
const server = createServer(async (request, response) => {
try {
const url = new URL(request.url ?? "/", "http://127.0.0.1");
const relative = decodeURIComponent(url.pathname).startsWith(prefix)
? decodeURIComponent(url.pathname).slice(prefix.length)
: decodeURIComponent(url.pathname).replace(/^\/+/, "");
const normalized = path.posix.normalize(relative || "index.html");
if (
normalized === ".." ||
normalized.startsWith("../") ||
path.isAbsolute(normalized)
) {
response.writeHead(400).end("Bad request");
return;
}
let file = path.join(root, normalized);
if ((await stat(file).catch(() => null))?.isDirectory())
file = path.join(file, "index.html");
const content = await readFile(file);
response.writeHead(200, {
"Content-Type":
types.get(path.extname(file)) ?? "application/octet-stream",
"Cache-Control": "no-cache",
...headers,
});
response.end(content);
} catch {
response.writeHead(404, { "Content-Type": "text/plain; charset=utf-8" });
response.end("Not found");
}
});
server.listen(4197, "127.0.0.1", () => console.log("Test server ready"));
src/App.tsx
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import { lazy, Suspense, useState } from "react";
import { AppShell } from "@add-ideas/toolbox-shell-react";
import "@add-ideas/toolbox-shell-react/styles.css";
import "./styles.css";
import { ErrorBoundary } from "./components/ErrorBoundary";
import { HelpDialog } from "./components/HelpDialog";
import { manifest } from "./toolbox/manifest";
const Workbench = lazy(async () => ({
default: (await import("./components/Workbench")).Workbench,
}));
export function App() {
const [helpOpen, setHelpOpen] = useState(false);
return (
<ErrorBoundary>
<AppShell
app={manifest}
manifestUrl="./toolbox-app.json"
helpAction={{ onClick: () => setHelpOpen(true) }}
>
<Suspense
fallback={
<p className="loading" role="status">
Preparing Subtitle Tools…
</p>
}
>
<Workbench />
</Suspense>
</AppShell>
<HelpDialog open={helpOpen} onClose={() => setHelpOpen(false)} />
</ErrorBoundary>
);
}
src/components/ErrorBoundary.tsx
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import { Component, type ErrorInfo, type ReactNode } from "react";
export class ErrorBoundary extends Component<
{ children: ReactNode },
{ error?: Error }
> {
state: { error?: Error } = {};
static getDerivedStateFromError(error: Error) {
return { error };
}
componentDidCatch(error: Error, info: ErrorInfo) {
console.error("Application failure", error, info);
}
render() {
if (this.state.error)
return (
<main className="fatal">
<h1>Subtitle Tools could not continue</h1>
<p>{this.state.error.message}</p>
<button type="button" onClick={() => location.reload()}>
Reload
</button>
</main>
);
return this.props.children;
}
}
src/components/HelpDialog.tsx
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import { useEffect, useRef } from "react";
export function HelpDialog({
open,
onClose,
}: {
open: boolean;
onClose: () => void;
}) {
const dialog = useRef<HTMLDialogElement>(null);
useEffect(() => {
const node = dialog.current;
if (!node) return;
if (open && !node.open) node.showModal();
if (!open && node.open) node.close();
}, [open]);
return (
<dialog
ref={dialog}
className="help-dialog"
onClose={onClose}
onCancel={onClose}
aria-labelledby="help-title"
>
<div className="dialog-heading">
<div>
<p className="eyebrow">Local-first help</p>
<h2 id="help-title">About Subtitle Tools</h2>
</div>
<button type="button" onClick={onClose} aria-label="Close help">
×
</button>
</div>
<p>
Edit, validate, synchronize, compare, and convert SRT, WebVTT, and ASS
subtitles locally in the browser.
</p>
<p>
Subtitle and optional media inputs are bounded and remain on this
device. Validation thresholds are guidance; cross-format conversion
reports its styling and metadata boundary.
</p>
</dialog>
);
}
src/components/Waveform.tsx
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import { useEffect, useRef, useState } from "react";
import type { Cue } from "../subtitle/model";
interface WaveformData {
duration: number;
peaks: Float32Array;
url: string;
}
const MAX_AUDIO_BYTES = 128 * 1024 * 1024;
const MAX_DURATION_SECONDS = 4 * 60 * 60;
const PEAK_COUNT = 2_000;
export function Waveform({ cues }: { cues: readonly Cue[] }) {
const canvas = useRef<HTMLCanvasElement>(null);
const audio = useRef<HTMLAudioElement>(null);
const [waveform, setWaveform] = useState<WaveformData>();
const [error, setError] = useState("");
const [busy, setBusy] = useState(false);
useEffect(
() => () => {
if (waveform) URL.revokeObjectURL(waveform.url);
},
[waveform],
);
useEffect(() => {
const node = canvas.current;
if (!node || !waveform) return;
const ratio = Math.max(1, Math.min(2, globalThis.devicePixelRatio || 1));
const width = Math.max(320, node.clientWidth);
const height = 180;
node.width = Math.floor(width * ratio);
node.height = Math.floor(height * ratio);
const context = node.getContext("2d");
if (!context) return;
context.scale(ratio, ratio);
const style = getComputedStyle(node);
context.fillStyle = style.getPropertyValue("--wave-bg") || "#f1f2f7";
context.fillRect(0, 0, width, height);
context.strokeStyle = style.getPropertyValue("--wave-line") || "#5b4ec4";
context.beginPath();
waveform.peaks.forEach((peak, index) => {
const x = (index / Math.max(1, waveform.peaks.length - 1)) * width;
context.moveTo(x, height / 2 - peak * (height / 2 - 8));
context.lineTo(x, height / 2 + peak * (height / 2 - 8));
});
context.stroke();
context.strokeStyle = style.getPropertyValue("--cue-line") || "#d3495a";
context.globalAlpha = 0.7;
for (const cue of cues) {
const x = (cue.startMs / 1000 / waveform.duration) * width;
if (x < 0 || x > width) continue;
context.beginPath();
context.moveTo(x, 0);
context.lineTo(x, height);
context.stroke();
}
}, [cues, waveform]);
const open = async (file: File | undefined) => {
if (!file) return;
if (file.size > MAX_AUDIO_BYTES) {
setError("Audio exceeds the 128 MiB waveform limit.");
return;
}
setBusy(true);
setError("");
try {
const AudioContextConstructor =
globalThis.AudioContext ??
(
globalThis as typeof globalThis & {
webkitAudioContext?: typeof AudioContext;
}
).webkitAudioContext;
if (!AudioContextConstructor)
throw new Error("Web Audio is unavailable.");
const context = new AudioContextConstructor();
try {
const decoded = await context.decodeAudioData(await file.arrayBuffer());
if (
!Number.isFinite(decoded.duration) ||
decoded.duration > MAX_DURATION_SECONDS
)
throw new Error(
"Decoded audio exceeds the four-hour waveform limit.",
);
const channel = decoded.getChannelData(0);
const peaks = new Float32Array(Math.min(PEAK_COUNT, channel.length));
const stride = Math.max(1, Math.floor(channel.length / peaks.length));
for (let bucket = 0; bucket < peaks.length; bucket += 1) {
let peak = 0;
const end = Math.min(channel.length, (bucket + 1) * stride);
for (let index = bucket * stride; index < end; index += 1)
peak = Math.max(peak, Math.abs(channel[index] ?? 0));
peaks[bucket] = peak;
}
const url = URL.createObjectURL(file);
setWaveform((current) => {
if (current) URL.revokeObjectURL(current.url);
return { duration: decoded.duration, peaks, url };
});
} finally {
await context.close();
}
} catch (reason) {
setError(
reason instanceof Error ? reason.message : "Audio decode failed.",
);
} finally {
setBusy(false);
}
};
const seek = (event: React.MouseEvent<HTMLCanvasElement>) => {
if (!waveform || !audio.current) return;
const bounds = event.currentTarget.getBoundingClientRect();
audio.current.currentTime =
((event.clientX - bounds.left) / Math.max(1, bounds.width)) *
waveform.duration;
void audio.current.play();
};
return (
<section className="waveform-workspace">
<div className="panel-heading">
<div>
<p className="eyebrow">Optional local media</p>
<h2>Waveform synchronization</h2>
</div>
<label className="file-button">
{busy ? "Decoding…" : "Open audio"}
<input
type="file"
accept="audio/*,video/*"
disabled={busy}
onChange={(event) => void open(event.target.files?.[0])}
/>
</label>
</div>
<p className="muted">
Native playback is available immediately. Peak extraction is bounded and
stays in this browser; it is not speech recognition or automatic
alignment.
</p>
{error && (
<p className="error" role="alert">
{error}
</p>
)}
{waveform ? (
<>
<audio ref={audio} src={waveform.url} controls preload="metadata" />
<canvas
ref={canvas}
className="waveform"
aria-label="Audio waveform with subtitle start markers"
onClick={seek}
/>
</>
) : (
<p className="empty">Choose a browser-decodable audio or video file.</p>
)}
</section>
);
}
src/components/Workbench.tsx
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import { useMemo, useState } from "react";
import {
decodeText,
triggerBlobDownload,
type TextEncoding,
} from "@add-ideas/toolbox-helpers";
import {
DEFAULT_VALIDATION,
compareDocuments,
convertFrameRate,
documentSummary,
parseSubtitle,
replaceCue,
serializeSubtitle,
sortCues,
transformTiming,
validateDocument,
type SubtitleDocument,
type SubtitleFormat,
type ValidationOptions,
} from "../subtitle/model";
import { Waveform } from "./Waveform";
type Tab = "source" | "cues" | "timing" | "compare" | "waveform";
const EXAMPLE = `1
00:00:01,000 --> 00:00:03,200
Welcome to Subtitle Tools.
2
00:00:03,100 --> 00:00:05,000
This overlap and reading speed
are deliberately inspectable.
`;
function clock(milliseconds: number): string {
const sign = milliseconds < 0 ? "−" : "";
const value = Math.abs(Math.round(milliseconds));
const hours = Math.floor(value / 3_600_000);
const minutes = Math.floor((value % 3_600_000) / 60_000);
const seconds = Math.floor((value % 60_000) / 1000);
const fraction = value % 1000;
return `${sign}${String(hours).padStart(2, "0")}:${String(minutes).padStart(2, "0")}:${String(seconds).padStart(2, "0")}.${String(fraction).padStart(3, "0")}`;
}
function NumberField({
label,
value,
change,
min,
max,
step,
}: {
label: string;
value: number;
change: (value: number) => void;
min?: number;
max?: number;
step?: number;
}) {
return (
<label className="field">
<span>{label}</span>
<input
type="number"
value={value}
min={min}
max={max}
step={step}
onChange={(event) => change(event.target.valueAsNumber)}
/>
</label>
);
}
export function Workbench() {
const [tab, setTab] = useState<Tab>("source");
const [source, setSource] = useState(EXAMPLE);
const [format, setFormat] = useState<SubtitleFormat | "auto">("auto");
const [encoding, setEncoding] = useState<TextEncoding>("utf-8");
const [document, setDocument] = useState<SubtitleDocument>(() =>
parseSubtitle(EXAMPLE),
);
const [selected, setSelected] = useState(0);
const [error, setError] = useState("");
const [exportFormat, setExportFormat] = useState<SubtitleFormat>("srt");
const [validation, setValidation] =
useState<ValidationOptions>(DEFAULT_VALIDATION);
const [shiftMs, setShiftMs] = useState(0);
const [scalePercent, setScalePercent] = useState(100);
const [anchorMs, setAnchorMs] = useState(0);
const [clamp, setClamp] = useState(false);
const [sourceFps, setSourceFps] = useState(25);
const [targetFps, setTargetFps] = useState(23.976);
const [revision, setRevision] = useState("");
const [revisionDocument, setRevisionDocument] = useState<SubtitleDocument>();
const issues = useMemo(
() => validateDocument(document, validation),
[document, validation],
);
const summary = useMemo(() => documentSummary(document), [document]);
const changes = useMemo(
() =>
revisionDocument ? compareDocuments(document, revisionDocument) : [],
[document, revisionDocument],
);
const serialized = useMemo(() => {
try {
return serializeSubtitle(document, exportFormat);
} catch {
return "";
}
}, [document, exportFormat]);
const parse = (value = source) => {
try {
const next = parseSubtitle(value, format);
setDocument(next);
setSelected(0);
setExportFormat(next.format);
setError("");
} catch (reason) {
setError(
reason instanceof Error ? reason.message : "Subtitle parsing failed.",
);
}
};
const open = async (file: File | undefined) => {
if (!file) return;
if (file.size > 8 * 1024 * 1024) {
setError("Subtitle file exceeds the 8 MiB byte-input limit.");
return;
}
try {
const decoded = decodeText(
new Uint8Array(await file.arrayBuffer()),
encoding,
false,
);
setSource(decoded);
const next = parseSubtitle(decoded, format);
setDocument(next);
setExportFormat(next.format);
setSelected(0);
setError("");
} catch (reason) {
setError(
reason instanceof Error ? reason.message : "File decoding failed.",
);
}
};
const applyTransform = () => {
try {
setDocument(
transformTiming(document, {
shiftMs,
scale: scalePercent / 100,
anchorMs,
clampToZero: clamp,
}),
);
setError("");
} catch (reason) {
setError(
reason instanceof Error ? reason.message : "Timing transform failed.",
);
}
};
const applyFrameRate = () => {
try {
setDocument(convertFrameRate(document, sourceFps, targetFps));
setError("");
} catch (reason) {
setError(
reason instanceof Error
? reason.message
: "Frame-rate conversion failed.",
);
}
};
const download = () => {
try {
const value = serializeSubtitle(document, exportFormat);
triggerBlobDownload(
new Blob([value], { type: "text/plain;charset=utf-8" }),
`subtitles.${exportFormat}`,
);
setError("");
} catch (reason) {
setError(reason instanceof Error ? reason.message : "Export failed.");
}
};
const loadRevision = () => {
try {
setRevisionDocument(parseSubtitle(revision));
setError("");
} catch (reason) {
setError(
reason instanceof Error ? reason.message : "Revision parsing failed.",
);
}
};
const selectedCue = document.cues[selected];
const tabs: Array<[Tab, string]> = [
["source", "Source & export"],
["cues", "Cues & checks"],
["timing", "Timing"],
["compare", "Compare"],
["waveform", "Waveform"],
];
return (
<main className="workbench">
<header className="hero">
<div>
<p className="eyebrow">Local subtitle workshop</p>
<h1>Subtitle Tools</h1>
<p>
Inspect, edit, synchronize, validate, compare, and convert SRT,
WebVTT, and ASS captions without uploading media or text.
</p>
</div>
<span className="privacy-pill">No network requests</span>
</header>
<section className="summary panel" aria-label="Subtitle summary">
<div>
<span>Detected</span>
<strong>{summary.format.toUpperCase()}</strong>
</div>
<div>
<span>Cues</span>
<strong>{summary.cues.toLocaleString()}</strong>
</div>
<div>
<span>Timeline</span>
<strong>{clock(summary.durationMs)}</strong>
</div>
<div>
<span>Characters</span>
<strong>{summary.textCharacters.toLocaleString()}</strong>
</div>
<div>
<span>Issues</span>
<strong>{issues.length.toLocaleString()}</strong>
</div>
</section>
<nav className="tabs" role="tablist" aria-label="Subtitle workspaces">
{tabs.map(([value, label]) => (
<button
key={value}
type="button"
role="tab"
aria-selected={tab === value}
onClick={() => setTab(value)}
>
{label}
</button>
))}
</nav>
{error && (
<p className="error" role="alert">
{error}
</p>
)}
{tab === "source" && (
<section className="workspace two-columns">
<article className="panel editor-panel">
<div className="panel-heading">
<div>
<p className="eyebrow">Untrusted input</p>
<h2>Subtitle source</h2>
</div>
<label className="file-button">
Open file
<input
type="file"
accept=".srt,.vtt,.ass,.ssa,text/plain,text/vtt"
onChange={(event) => void open(event.target.files?.[0])}
/>
</label>
</div>
<div className="form-grid">
<label className="field">
<span>Input format</span>
<select
value={format}
onChange={(event) =>
setFormat(event.target.value as SubtitleFormat | "auto")
}
>
<option value="auto">Detect automatically</option>
<option value="srt">SubRip (SRT)</option>
<option value="vtt">WebVTT</option>
<option value="ass">ASS / SSA</option>
</select>
</label>
<label className="field">
<span>File encoding</span>
<select
value={encoding}
onChange={(event) =>
setEncoding(event.target.value as TextEncoding)
}
>
<option value="utf-8">UTF-8</option>
<option value="utf-16le">UTF-16 LE</option>
<option value="utf-16be">UTF-16 BE</option>
<option value="latin1">ISO-8859-1</option>
</select>
</label>
</div>
<textarea
className="source-editor"
aria-label="Subtitle source"
value={source}
spellCheck={false}
onChange={(event) => setSource(event.target.value)}
/>
<button className="primary" type="button" onClick={() => parse()}>
Parse source
</button>
</article>
<article className="panel editor-panel">
<div className="panel-heading">
<div>
<p className="eyebrow">Explicit conversion</p>
<h2>Export preview</h2>
</div>
<button className="primary" type="button" onClick={download}>
Download
</button>
</div>
<label className="field">
<span>Output format</span>
<select
value={exportFormat}
onChange={(event) =>
setExportFormat(event.target.value as SubtitleFormat)
}
>
<option value="srt">SubRip (SRT)</option>
<option value="vtt">WebVTT</option>
<option value="ass">Advanced SubStation Alpha</option>
</select>
</label>
{exportFormat !== document.format && (
<p className="warning">
Cross-format conversion preserves cue text and timing.
Format-specific positioning, styles, regions, comments, and
metadata can be lost.
</p>
)}
<textarea
className="source-editor"
aria-label="Export preview"
readOnly
value={serialized}
/>
</article>
</section>
)}
{tab === "cues" && (
<section className="workspace cue-layout">
<article className="panel cue-list">
<div className="panel-heading">
<div>
<p className="eyebrow">Timeline</p>
<h2>Cues</h2>
</div>
<button
type="button"
onClick={() => setDocument(sortCues(document))}
>
Sort by start
</button>
</div>
<ol>
{document.cues.slice(0, 10_000).map((cue, index) => (
<li key={`${cue.sourceLine}-${index}`}>
<button
type="button"
className={selected === index ? "selected" : ""}
onClick={() => setSelected(index)}
>
<span>{index + 1}</span>
<time>
{clock(cue.startMs)} → {clock(cue.endMs)}
</time>
<strong>
{cue.text.replaceAll("\n", " ").slice(0, 90) || "(empty)"}
</strong>
</button>
</li>
))}
</ol>
{document.cues.length > 10_000 && (
<p className="warning">
The editor lists the first 10,000 cues; validation and export
include all cues.
</p>
)}
</article>
<div className="cue-side">
<article className="panel">
<div className="panel-heading">
<div>
<p className="eyebrow">Selected cue</p>
<h2>Edit</h2>
</div>
</div>
{selectedCue ? (
<>
<div className="form-grid">
<NumberField
label="Start (ms)"
value={selectedCue.startMs}
min={0}
change={(value) =>
setDocument(
replaceCue(document, selected, { startMs: value }),
)
}
/>
<NumberField
label="End (ms)"
value={selectedCue.endMs}
min={0}
change={(value) =>
setDocument(
replaceCue(document, selected, { endMs: value }),
)
}
/>
</div>
<label className="field">
<span>Text</span>
<textarea
value={selectedCue.text}
onChange={(event) =>
setDocument(
replaceCue(document, selected, {
text: event.target.value,
}),
)
}
/>
</label>
</>
) : (
<p className="empty">No cue selected.</p>
)}
</article>
<article className="panel issues">
<div className="panel-heading">
<div>
<p className="eyebrow">Rules</p>
<h2>Validation</h2>
</div>
</div>
<div className="thresholds">
<NumberField
label="Max characters/s"
value={validation.maxCharactersPerSecond}
min={1}
max={200}
change={(value) =>
setValidation({
...validation,
maxCharactersPerSecond: value,
})
}
/>
<NumberField
label="Max line length"
value={validation.maxLineLength}
min={1}
max={1000}
change={(value) =>
setValidation({ ...validation, maxLineLength: value })
}
/>
<NumberField
label="Max lines"
value={validation.maxLines}
min={1}
max={100}
change={(value) =>
setValidation({ ...validation, maxLines: value })
}
/>
</div>
{issues.length ? (
<ul>
{issues.slice(0, 2_000).map((issue, index) => (
<li
key={`${issue.code}-${issue.cue ?? 0}-${index}`}
className={issue.level}
>
<code>{issue.code}</code>{" "}
{issue.cue ? `Cue ${issue.cue}: ` : ""}
{issue.message}
</li>
))}
</ul>
) : (
<p className="success">
No issues under the current thresholds.
</p>
)}
</article>
</div>
</section>
)}
{tab === "timing" && (
<section className="workspace two-columns">
<article className="panel">
<div className="panel-heading">
<div>
<p className="eyebrow">Affine transform</p>
<h2>Shift and stretch</h2>
</div>
</div>
<div className="form-grid">
<NumberField
label="Shift (ms)"
value={shiftMs}
step={1}
change={setShiftMs}
/>
<NumberField
label="Scale (%)"
value={scalePercent}
min={0.001}
max={10_000}
step={0.001}
change={setScalePercent}
/>
<NumberField
label="Anchor (ms)"
value={anchorMs}
min={0}
step={1}
change={setAnchorMs}
/>
</div>
<label className="check">
<input
type="checkbox"
checked={clamp}
onChange={(event) => setClamp(event.target.checked)}
/>
Move the entire result forward if it would become negative
</label>
<button className="primary" type="button" onClick={applyTransform}>
Apply timing transform
</button>
</article>
<article className="panel">
<div className="panel-heading">
<div>
<p className="eyebrow">Frame interpretation</p>
<h2>Frame-rate conversion</h2>
</div>
</div>
<p className="muted">
Scales timestamps by source FPS ÷ target FPS. It does not inspect
media or snap individual cues to frames.
</p>
<div className="form-grid">
<NumberField
label="Source FPS"
value={sourceFps}
min={0.001}
max={1000}
step={0.001}
change={setSourceFps}
/>
<NumberField
label="Target FPS"
value={targetFps}
min={0.001}
max={1000}
step={0.001}
change={setTargetFps}
/>
</div>
<button className="primary" type="button" onClick={applyFrameRate}>
Convert frame rate
</button>
</article>
</section>
)}
{tab === "compare" && (
<section className="workspace two-columns">
<article className="panel editor-panel">
<div className="panel-heading">
<div>
<p className="eyebrow">Second revision</p>
<h2>Compare input</h2>
</div>
</div>
<textarea
className="source-editor"
aria-label="Revision subtitle source"
value={revision}
onChange={(event) => setRevision(event.target.value)}
placeholder="Paste SRT, WebVTT, or ASS…"
/>
<button className="primary" type="button" onClick={loadRevision}>
Parse and compare
</button>
</article>
<article className="panel revision-results">
<div className="panel-heading">
<div>
<p className="eyebrow">Index-aligned revision</p>
<h2>{changes.length} changes</h2>
</div>
</div>
<p className="muted">
v0.1 compares cue positions deterministically. Insertions can
shift later matches; no semantic alignment is claimed.
</p>
{revisionDocument ? (
changes.length ? (
<ol>
{changes.slice(0, 5_000).map((change) => (
<li key={`${change.kind}-${change.index}`}>
<strong>
Cue {change.index + 1}: {change.kind}
</strong>
<span>
{change.before
? `${clock(change.before.startMs)} ${change.before.text.slice(0, 80)}`
: "—"}
</span>
<span>
{change.after
? `${clock(change.after.startMs)} ${change.after.text.slice(0, 80)}`
: "—"}
</span>
</li>
))}
</ol>
) : (
<p className="success">No index-aligned changes.</p>
)
) : (
<p className="empty">Paste and parse a second revision.</p>
)}
</article>
</section>
)}
{tab === "waveform" && (
<section className="panel">
<Waveform cues={document.cues} />
</section>
)}
<section className="panel boundary">
<p>
Parsing and media decoding stay local. Validation is configurable
guidance, not a broadcaster, accessibility, or legal compliance
verdict. ASS round trips retain parsed dialogue fields; cross-format
exports explicitly discard unsupported styling.
</p>
</section>
</main>
);
}
src/main.tsx
+18
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@@ -0,0 +1,18 @@
import { StrictMode } from "react";
import { createRoot } from "react-dom/client";
import { App } from "./App";
createRoot(document.getElementById("root")!).render(
<StrictMode>
<App />
</StrictMode>,
);
if ("serviceWorker" in navigator && import.meta.env.PROD) {
window.addEventListener("load", () => {
const url = new URL("./sw.js", document.baseURI);
void navigator.serviceWorker
.register(url, { scope: new URL("./", document.baseURI).pathname })
.catch(() => undefined);
});
}
src/styles.css
+546
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@@ -0,0 +1,546 @@
:root {
font-family:
Inter,
ui-sans-serif,
system-ui,
-apple-system,
BlinkMacSystemFont,
"Segoe UI",
sans-serif;
color: #242233;
background: #f3f4f8;
font-synthesis: none;
--surface: #fff;
--surface-muted: #f4f3fa;
--line: #d8d6e5;
--ink-muted: #66637a;
--accent: #5b4ec4;
--accent-dark: #4336a4;
--danger: #a5263d;
--warning: #8a5700;
--success: #187148;
--wave-bg: #eeedf7;
--wave-line: #5b4ec4;
--cue-line: #ce3d59;
}
:root[data-toolbox-theme="dark"] {
color: #f0eff8;
background: #15141b;
--surface: #211f29;
--surface-muted: #2a2735;
--line: #454153;
--ink-muted: #b9b5c8;
--accent: #a99cff;
--accent-dark: #c0b7ff;
--danger: #ff91a2;
--warning: #ffd078;
--success: #78d7a9;
--wave-bg: #292634;
--wave-line: #aa9cff;
--cue-line: #ff8195;
}
@media (prefers-color-scheme: dark) {
:root:not([data-toolbox-theme="light"]) {
color: #f0eff8;
background: #15141b;
--surface: #211f29;
--surface-muted: #2a2735;
--line: #454153;
--ink-muted: #b9b5c8;
--accent: #a99cff;
--accent-dark: #c0b7ff;
--danger: #ff91a2;
--warning: #ffd078;
--success: #78d7a9;
--wave-bg: #292634;
--wave-line: #aa9cff;
--cue-line: #ff8195;
}
}
* {
box-sizing: border-box;
}
body {
margin: 0;
min-width: 320px;
min-height: 100vh;
background: inherit;
color: inherit;
}
button,
input,
select,
textarea {
color: inherit;
font: inherit;
}
button,
.file-button,
input,
select,
textarea {
border: 1px solid var(--line);
border-radius: 0.72rem;
background: var(--surface);
}
button,
.file-button {
min-height: 2.6rem;
padding: 0.58rem 0.9rem;
cursor: pointer;
font-weight: 700;
}
button:hover,
.file-button:hover {
border-color: var(--accent);
}
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.file-button:focus-within {
outline: 3px solid color-mix(in srgb, var(--accent) 35%, transparent);
outline-offset: 2px;
}
.primary {
border-color: var(--accent);
background: var(--accent);
color: #fff;
}
:root[data-toolbox-theme="dark"] .primary {
color: #17131f;
}
.workbench {
width: min(100%, 90rem);
margin: 0 auto;
padding: 1.4rem clamp(0.75rem, 2.5vw, 2rem) 3rem;
}
.hero,
.panel-heading,
.summary,
.tabs,
.form-grid,
.two-columns,
.cue-layout {
display: flex;
}
.hero {
align-items: flex-start;
justify-content: space-between;
gap: 1.2rem;
margin-bottom: 1rem;
}
h1,
h2,
p {
margin-top: 0;
}
h1 {
margin-bottom: 0.35rem;
font-size: clamp(1.8rem, 4vw, 3rem);
}
h2 {
margin-bottom: 0;
font-size: 1.15rem;
}
.hero > div > p:last-child {
max-width: 48rem;
margin-bottom: 0;
color: var(--ink-muted);
}
.eyebrow {
margin-bottom: 0.28rem;
color: var(--accent-dark);
font-size: 0.74rem;
font-weight: 800;
letter-spacing: 0.09em;
text-transform: uppercase;
}
.privacy-pill {
flex: none;
border: 1px solid color-mix(in srgb, var(--success) 50%, var(--line));
border-radius: 999px;
padding: 0.5rem 0.75rem;
color: var(--success);
font-size: 0.82rem;
font-weight: 800;
}
.panel {
border: 1px solid var(--line);
border-radius: 1rem;
background: var(--surface);
box-shadow: 0 0.45rem 1.4rem color-mix(in srgb, #151126 7%, transparent);
padding: 1rem;
}
.summary {
flex-wrap: wrap;
gap: 0.7rem;
margin-bottom: 0.8rem;
}
.summary > div {
flex: 1 1 9rem;
border-right: 1px solid var(--line);
padding: 0.15rem 0.8rem;
}
.summary > div:last-child {
border-right: 0;
}
.summary span,
.summary strong {
display: block;
}
.summary span {
color: var(--ink-muted);
font-size: 0.76rem;
text-transform: uppercase;
}
.summary strong {
margin-top: 0.2rem;
font-variant-numeric: tabular-nums;
}
.tabs {
gap: 0.35rem;
overflow-x: auto;
margin-bottom: 0.8rem;
padding: 0.2rem 0;
}
.tabs button {
white-space: nowrap;
}
.tabs button[aria-selected="true"] {
border-color: var(--accent);
background: var(--surface-muted);
color: var(--accent-dark);
}
.workspace {
margin-bottom: 0.8rem;
}
.two-columns,
.cue-layout {
align-items: stretch;
gap: 0.8rem;
}
.two-columns > *,
.cue-layout > * {
min-width: 0;
flex: 1 1 0;
}
.panel-heading {
align-items: center;
justify-content: space-between;
gap: 0.8rem;
margin-bottom: 0.8rem;
}
.file-button {
position: relative;
display: inline-flex;
align-items: center;
}
.file-button input {
position: absolute;
width: 1px;
height: 1px;
overflow: hidden;
clip: rect(0 0 0 0);
}
.form-grid {
flex-wrap: wrap;
gap: 0.65rem;
margin-bottom: 0.7rem;
}
.field {
display: grid;
flex: 1 1 11rem;
gap: 0.28rem;
min-width: 0;
color: var(--ink-muted);
font-size: 0.82rem;
font-weight: 700;
}
.field input,
.field select,
.field textarea {
width: 100%;
min-height: 2.6rem;
padding: 0.55rem 0.65rem;
color: inherit;
font-weight: 500;
}
.field textarea,
.source-editor {
resize: vertical;
}
.source-editor {
width: 100%;
min-height: 25rem;
margin-bottom: 0.65rem;
padding: 0.8rem;
font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
font-size: 0.84rem;
line-height: 1.5;
tab-size: 2;
}
.warning,
.error,
.success,
.muted,
.empty {
font-size: 0.9rem;
}
.warning {
color: var(--warning);
}
.error {
border: 1px solid color-mix(in srgb, var(--danger) 45%, var(--line));
border-radius: 0.75rem;
background: color-mix(in srgb, var(--danger) 8%, var(--surface));
padding: 0.7rem;
color: var(--danger);
}
.success {
color: var(--success);
}
.muted,
.empty {
color: var(--ink-muted);
}
.check {
display: flex;
align-items: flex-start;
gap: 0.5rem;
margin: 0.5rem 0 0.8rem;
color: var(--ink-muted);
font-size: 0.9rem;
}
.check input {
margin-top: 0.2rem;
}
.cue-list {
max-height: 52rem;
overflow: auto;
}
.cue-list ol,
.issues ul,
.revision-results ol {
margin: 0;
padding: 0;
list-style: none;
}
.cue-list li + li,
.issues li + li,
.revision-results li + li {
margin-top: 0.4rem;
}
.cue-list li button {
display: grid;
grid-template-columns: 3rem 1fr;
width: 100%;
text-align: left;
}
.cue-list li button.selected {
border-color: var(--accent);
background: var(--surface-muted);
}
.cue-list time {
font-variant-numeric: tabular-nums;
color: var(--ink-muted);
}
.cue-list strong {
grid-column: 2;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}
.cue-side {
display: grid;
align-content: start;
gap: 0.8rem;
}
.thresholds {
display: grid;
grid-template-columns: repeat(3, minmax(0, 1fr));
gap: 0.45rem;
}
.issues ul {
max-height: 24rem;
overflow: auto;
margin-top: 0.8rem;
}
.issues li {
border-left: 3px solid var(--warning);
padding: 0.35rem 0.55rem;
color: var(--ink-muted);
font-size: 0.84rem;
}
.issues li.error {
border: 0;
border-left: 3px solid var(--danger);
border-radius: 0;
background: transparent;
padding: 0.35rem 0.55rem;
}
.revision-results ol {
max-height: 36rem;
overflow: auto;
}
.revision-results li {
display: grid;
gap: 0.25rem;
border: 1px solid var(--line);
border-radius: 0.7rem;
padding: 0.55rem;
}
.revision-results span {
overflow-wrap: anywhere;
color: var(--ink-muted);
font-size: 0.82rem;
}
.waveform-workspace audio,
.waveform {
display: block;
width: 100%;
}
.waveform-workspace audio {
margin-bottom: 0.7rem;
}
.waveform {
height: 180px;
border: 1px solid var(--line);
border-radius: 0.75rem;
cursor: crosshair;
}
.boundary {
color: var(--ink-muted);
}
.boundary p {
margin: 0;
}
.loading,
.fatal {
width: min(100%, 90rem);
margin: 2rem auto;
padding: 1rem;
}
.help-dialog {
width: min(36rem, calc(100vw - 2rem));
border: 1px solid var(--line);
border-radius: 1rem;
background: var(--surface);
color: inherit;
padding: 1rem;
}
.help-dialog::backdrop {
background: rgb(16 14 25 / 55%);
}
.dialog-heading {
display: flex;
align-items: flex-start;
justify-content: space-between;
gap: 1rem;
}
@media (max-width: 800px) {
.hero,
.two-columns,
.cue-layout {
flex-direction: column;
}
.privacy-pill {
align-self: flex-start;
}
.two-columns > *,
.cue-layout > * {
width: 100%;
}
.thresholds {
grid-template-columns: 1fr;
}
.source-editor {
min-height: 18rem;
}
}
@media (prefers-reduced-motion: reduce) {
*,
*::before,
*::after {
scroll-behavior: auto !important;
transition: none !important;
}
}
src/subtitle/model.ts
+700
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@@ -0,0 +1,700 @@
export type SubtitleFormat = "srt" | "vtt" | "ass";
export interface Cue {
id: string;
startMs: number;
endMs: number;
text: string;
settings?: string;
assFields?: Record<string, string>;
sourceLine: number;
}
export interface SubtitleDocument {
format: SubtitleFormat;
cues: Cue[];
preamble: string[];
assFormat?: string[];
warnings: string[];
}
export interface CueIssue {
level: "error" | "warning" | "info";
code: string;
cue?: number;
message: string;
}
export interface ValidationOptions {
maxCharactersPerSecond: number;
maxLineLength: number;
maxLines: number;
minimumDurationMs: number;
maximumDurationMs: number;
}
export const DEFAULT_VALIDATION: ValidationOptions = {
maxCharactersPerSecond: 20,
maxLineLength: 42,
maxLines: 2,
minimumDurationMs: 500,
maximumDurationMs: 7_000,
};
const MAX_SOURCE_UNITS = 4_000_000;
const MAX_CUES = 100_000;
const MAX_LINE_UNITS = 250_000;
function normalizeSource(source: string): string {
if (source.length > MAX_SOURCE_UNITS)
throw new Error("Subtitle source exceeds 4,000,000 UTF-16 units.");
const normalized = source.replaceAll("\r\n", "\n").replaceAll("\r", "\n");
if (normalized.split("\n").some((line) => line.length > MAX_LINE_UNITS))
throw new Error("A subtitle line exceeds 250,000 UTF-16 units.");
return normalized.replace(/^\uFEFF/u, "");
}
export function detectFormat(source: string): SubtitleFormat {
const head = source.replace(/^\uFEFF/u, "").slice(0, 16_384);
if (/^WEBVTT(?:[ \t]|$)/mu.test(head)) return "vtt";
if (/^\s*\[(?:Script Info|Events|V4\+? Styles)\]/imu.test(head)) return "ass";
return "srt";
}
function parseTimestamp(value: string, format: "srt" | "vtt"): number {
const match = /^(?:(\d{1,6}):)?(\d{2}):(\d{2})[,.](\d{3})$/u.exec(
value.trim(),
);
if (!match)
throw new Error(`Invalid ${format.toUpperCase()} timestamp: ${value}`);
const hours = Number(match[1] ?? 0);
const minutes = Number(match[2]);
const seconds = Number(match[3]);
const milliseconds = Number(match[4]);
if (minutes > 59 || seconds > 59)
throw new Error(`Timestamp component is outside its range: ${value}`);
const result = ((hours * 60 + minutes) * 60 + seconds) * 1000 + milliseconds;
if (!Number.isSafeInteger(result)) throw new Error("Timestamp is too large.");
return result;
}
function parseAssTimestamp(value: string): number {
const match = /^(\d{1,6}):(\d{2}):(\d{2})[.](\d{1,3})$/u.exec(value.trim());
if (!match) throw new Error(`Invalid ASS timestamp: ${value}`);
const hours = Number(match[1]);
const minutes = Number(match[2]);
const seconds = Number(match[3]);
const fraction = Number(match[4]!.padEnd(3, "0"));
if (minutes > 59 || seconds > 59)
throw new Error(`Timestamp component is outside its range: ${value}`);
const result = ((hours * 60 + minutes) * 60 + seconds) * 1000 + fraction;
if (!Number.isSafeInteger(result)) throw new Error("Timestamp is too large.");
return result;
}
function splitBlocks(source: string): Array<{ text: string; line: number }> {
const blocks: Array<{ text: string; line: number }> = [];
const lines = source.split("\n");
let start = 0;
for (let index = 0; index <= lines.length; index += 1) {
if (index < lines.length && lines[index]!.trim() !== "") continue;
if (index > start) {
const text = lines.slice(start, index).join("\n");
if (text.trim()) blocks.push({ text, line: start + 1 });
}
start = index + 1;
}
return blocks;
}
function parseSrt(source: string): SubtitleDocument {
const cues: Cue[] = [];
const warnings: string[] = [];
for (const block of splitBlocks(source)) {
const lines = block.text.split("\n");
let timingIndex = 0;
let id = "";
if (!lines[0]!.includes("-->")) {
id = lines[0]!.trim();
timingIndex = 1;
}
const timing = /^(\S+)\s*-->\s*(\S+)(?:\s+(.*))?$/u.exec(
lines[timingIndex] ?? "",
);
if (!timing) {
warnings.push(
`Ignored block at line ${block.line}: no valid timing line.`,
);
continue;
}
try {
cues.push({
id: id || String(cues.length + 1),
startMs: parseTimestamp(timing[1]!, "srt"),
endMs: parseTimestamp(timing[2]!, "srt"),
text: lines.slice(timingIndex + 1).join("\n"),
settings: timing[3]?.trim() || undefined,
sourceLine: block.line,
});
} catch (reason) {
warnings.push(
`Ignored block at line ${block.line}: ${reason instanceof Error ? reason.message : "invalid timing"}`,
);
}
if (cues.length > MAX_CUES)
throw new Error("Subtitle exceeds 100,000 cues.");
}
return { format: "srt", cues, preamble: [], warnings };
}
function parseVtt(source: string): SubtitleDocument {
const blocks = splitBlocks(source);
const first = blocks.shift();
if (!first || !/^WEBVTT(?:[ \t]|$)/u.test(first.text))
throw new Error("WebVTT must begin with WEBVTT.");
const cues: Cue[] = [];
const preamble = first.text.split("\n").slice(1);
const warnings: string[] = [];
for (const block of blocks) {
const lines = block.text.split("\n");
if (/^(?:NOTE|STYLE|REGION)(?:[ \t]|$)/u.test(lines[0]!)) {
preamble.push("", block.text);
continue;
}
const timingIndex = lines[0]!.includes("-->") ? 0 : 1;
const timing = /^(\S+)\s*-->\s*(\S+)(?:\s+(.*))?$/u.exec(
lines[timingIndex] ?? "",
);
if (!timing) {
warnings.push(
`Ignored block at line ${block.line}: no valid timing line.`,
);
continue;
}
try {
cues.push({
id: timingIndex === 1 ? lines[0]!.trim() : String(cues.length + 1),
startMs: parseTimestamp(timing[1]!, "vtt"),
endMs: parseTimestamp(timing[2]!, "vtt"),
text: lines.slice(timingIndex + 1).join("\n"),
settings: timing[3]?.trim() || undefined,
sourceLine: block.line,
});
} catch (reason) {
warnings.push(
`Ignored block at line ${block.line}: ${reason instanceof Error ? reason.message : "invalid timing"}`,
);
}
if (cues.length > MAX_CUES)
throw new Error("Subtitle exceeds 100,000 cues.");
}
return { format: "vtt", cues, preamble, warnings };
}
function splitLimited(value: string, count: number): string[] {
const result: string[] = [];
let start = 0;
for (let index = 1; index < count; index += 1) {
const comma = value.indexOf(",", start);
if (comma < 0) break;
result.push(value.slice(start, comma));
start = comma + 1;
}
result.push(value.slice(start));
return result;
}
const DEFAULT_ASS_FORMAT = [
"Layer",
"Start",
"End",
"Style",
"Name",
"MarginL",
"MarginR",
"MarginV",
"Effect",
"Text",
];
function parseAss(source: string): SubtitleDocument {
const lines = source.split("\n");
const cues: Cue[] = [];
const preamble: string[] = [];
const warnings: string[] = [];
let section = "";
let format = [...DEFAULT_ASS_FORMAT];
for (let index = 0; index < lines.length; index += 1) {
const line = lines[index]!;
const sectionMatch = /^\s*\[([^\]]+)\]\s*$/u.exec(line);
if (sectionMatch) section = sectionMatch[1]!.toLowerCase();
if (section === "events" && /^Format\s*:/iu.test(line)) {
format = line
.replace(/^Format\s*:/iu, "")
.split(",")
.map((field) => field.trim())
.filter(Boolean);
if (!format.some((field) => field.toLowerCase() === "text"))
warnings.push(`Events Format at line ${index + 1} has no Text field.`);
preamble.push(line);
continue;
}
const dialogue =
section === "events" ? /^Dialogue\s*:\s*(.*)$/iu.exec(line) : null;
if (!dialogue) {
preamble.push(line);
continue;
}
const values = splitLimited(dialogue[1]!, format.length);
if (values.length !== format.length) {
warnings.push(
`Ignored Dialogue at line ${index + 1}: field count mismatch.`,
);
continue;
}
const fields = Object.fromEntries(
format.map((field, fieldIndex) => [
field.toLowerCase(),
values[fieldIndex] ?? "",
]),
);
try {
cues.push({
id: String(cues.length + 1),
startMs: parseAssTimestamp(fields.start ?? ""),
endMs: parseAssTimestamp(fields.end ?? ""),
text: (fields.text ?? "")
.replaceAll("\\N", "\n")
.replaceAll("\\n", "\n"),
assFields: fields,
sourceLine: index + 1,
});
} catch (reason) {
warnings.push(
`Ignored Dialogue at line ${index + 1}: ${reason instanceof Error ? reason.message : "invalid timing"}`,
);
}
if (cues.length > MAX_CUES)
throw new Error("Subtitle exceeds 100,000 cues.");
}
return { format: "ass", cues, preamble, assFormat: format, warnings };
}
export function parseSubtitle(
source: string,
requested: SubtitleFormat | "auto" = "auto",
): SubtitleDocument {
const normalized = normalizeSource(source);
const format = requested === "auto" ? detectFormat(normalized) : requested;
const document =
format === "vtt"
? parseVtt(normalized)
: format === "ass"
? parseAss(normalized)
: parseSrt(normalized);
if (!document.cues.length)
document.warnings.push("No valid subtitle cues were found.");
return document;
}
function plainText(value: string): string {
return value
.replace(/<[^>]*>/gu, "")
.replace(/\{\\[^}]*\}/gu, "")
.replaceAll(/\s+/gu, " ")
.trim();
}
export function charactersPerSecond(cue: Cue): number {
const duration = cue.endMs - cue.startMs;
return duration > 0
? (plainText(cue.text).length * 1000) / duration
: Infinity;
}
export function validateDocument(
document: SubtitleDocument,
options: ValidationOptions = DEFAULT_VALIDATION,
): CueIssue[] {
const numbers = Object.values(options);
if (numbers.some((value) => !Number.isFinite(value) || value < 0))
throw new Error(
"Validation thresholds must be finite non-negative numbers.",
);
const issues: CueIssue[] = document.warnings.map((message) => ({
level: "warning",
code: "parse-warning",
message,
}));
document.cues.forEach((cue, index) => {
const cueNumber = index + 1;
const duration = cue.endMs - cue.startMs;
if (cue.startMs < 0)
issues.push({
level: "error",
code: "negative-time",
cue: cueNumber,
message: "Start time is negative.",
});
if (duration <= 0)
issues.push({
level: "error",
code: "invalid-duration",
cue: cueNumber,
message: "End time must be after start time.",
});
else {
if (duration < options.minimumDurationMs)
issues.push({
level: "warning",
code: "short-duration",
cue: cueNumber,
message: `Duration ${duration} ms is below ${options.minimumDurationMs} ms.`,
});
if (duration > options.maximumDurationMs)
issues.push({
level: "warning",
code: "long-duration",
cue: cueNumber,
message: `Duration ${duration} ms exceeds ${options.maximumDurationMs} ms.`,
});
const cps = charactersPerSecond(cue);
if (cps > options.maxCharactersPerSecond)
issues.push({
level: "warning",
code: "reading-speed",
cue: cueNumber,
message: `${cps.toFixed(1)} characters/s exceeds ${options.maxCharactersPerSecond}.`,
});
}
const lines = cue.text.split("\n");
if (!plainText(cue.text))
issues.push({
level: "warning",
code: "empty",
cue: cueNumber,
message: "Cue has no visible text.",
});
if (lines.length > options.maxLines)
issues.push({
level: "warning",
code: "line-count",
cue: cueNumber,
message: `${lines.length} lines exceed ${options.maxLines}.`,
});
let longest = 0;
for (const line of lines)
longest = Math.max(longest, [...plainText(line)].length);
if (longest > options.maxLineLength)
issues.push({
level: "warning",
code: "line-length",
cue: cueNumber,
message: `Longest line (${longest}) exceeds ${options.maxLineLength} characters.`,
});
if (index > 0) {
const previous = document.cues[index - 1]!;
if (cue.startMs < previous.startMs)
issues.push({
level: "warning",
code: "order",
cue: cueNumber,
message: "Cue starts before the preceding source cue.",
});
if (cue.startMs < previous.endMs)
issues.push({
level: "warning",
code: "overlap",
cue: cueNumber,
message: `Overlaps the preceding cue by ${previous.endMs - cue.startMs} ms.`,
});
}
});
return issues;
}
function cloneDocument(
document: SubtitleDocument,
cues: Cue[],
): SubtitleDocument {
return {
...document,
cues,
preamble: [...document.preamble],
assFormat: document.assFormat ? [...document.assFormat] : undefined,
warnings: [...document.warnings],
};
}
export interface TimingTransform {
shiftMs?: number;
scale?: number;
anchorMs?: number;
clampToZero?: boolean;
}
export function transformTiming(
document: SubtitleDocument,
transform: TimingTransform,
): SubtitleDocument {
const shift = transform.shiftMs ?? 0;
const scale = transform.scale ?? 1;
const anchor = transform.anchorMs ?? 0;
if (
![shift, scale, anchor].every(Number.isFinite) ||
scale <= 0 ||
scale > 100
)
throw new Error(
"Timing transform requires finite values and scale in (0, 100].",
);
const converted = document.cues.map((cue) => ({
...cue,
assFields: cue.assFields ? { ...cue.assFields } : undefined,
startMs: Math.round(anchor + (cue.startMs - anchor) * scale + shift),
endMs: Math.round(anchor + (cue.endMs - anchor) * scale + shift),
}));
let minimum = 0;
for (const cue of converted) minimum = Math.min(minimum, cue.startMs);
if (minimum < 0 && !transform.clampToZero)
throw new Error("Timing transform would create negative timestamps.");
if (minimum < 0)
for (const cue of converted) {
cue.startMs -= minimum;
cue.endMs -= minimum;
}
return cloneDocument(document, converted);
}
export function convertFrameRate(
document: SubtitleDocument,
sourceFramesPerSecond: number,
targetFramesPerSecond: number,
): SubtitleDocument {
if (
!Number.isFinite(sourceFramesPerSecond) ||
!Number.isFinite(targetFramesPerSecond) ||
sourceFramesPerSecond <= 0 ||
targetFramesPerSecond <= 0 ||
sourceFramesPerSecond > 1000 ||
targetFramesPerSecond > 1000
)
throw new Error("Frame rates must be finite values in (0, 1000].");
return transformTiming(document, {
scale: sourceFramesPerSecond / targetFramesPerSecond,
anchorMs: 0,
});
}
export function sortCues(document: SubtitleDocument): SubtitleDocument {
return cloneDocument(
document,
[...document.cues]
.map((cue) => ({
...cue,
assFields: cue.assFields ? { ...cue.assFields } : undefined,
}))
.sort(
(left, right) =>
left.startMs - right.startMs || left.endMs - right.endMs,
),
);
}
export function replaceCue(
document: SubtitleDocument,
index: number,
changes: Partial<Pick<Cue, "startMs" | "endMs" | "text">>,
): SubtitleDocument {
if (
!Number.isSafeInteger(index) ||
index < 0 ||
index >= document.cues.length
)
throw new Error("Cue index is outside the document.");
const cues = document.cues.map((cue, cueIndex) =>
cueIndex === index ? { ...cue, ...changes } : cue,
);
return cloneDocument(document, cues);
}
function formatTimestamp(milliseconds: number, separator: "," | "."): string {
if (!Number.isSafeInteger(milliseconds) || milliseconds < 0)
throw new Error("Cannot serialize a negative or unsafe timestamp.");
const hours = Math.floor(milliseconds / 3_600_000);
const minutes = Math.floor((milliseconds % 3_600_000) / 60_000);
const seconds = Math.floor((milliseconds % 60_000) / 1000);
const fraction = milliseconds % 1000;
return `${String(hours).padStart(2, "0")}:${String(minutes).padStart(2, "0")}:${String(seconds).padStart(2, "0")}${separator}${String(fraction).padStart(3, "0")}`;
}
function formatAssTimestamp(milliseconds: number): string {
if (!Number.isSafeInteger(milliseconds) || milliseconds < 0)
throw new Error("Cannot serialize a negative or unsafe timestamp.");
const centiseconds = Math.round(milliseconds / 10);
const hours = Math.floor(centiseconds / 360_000);
const minutes = Math.floor((centiseconds % 360_000) / 6_000);
const seconds = Math.floor((centiseconds % 6_000) / 100);
const fraction = centiseconds % 100;
return `${hours}:${String(minutes).padStart(2, "0")}:${String(seconds).padStart(2, "0")}.${String(fraction).padStart(2, "0")}`;
}
function serializeSrt(document: SubtitleDocument): string {
return `${document.cues
.map(
(cue, index) =>
`${index + 1}\n${formatTimestamp(cue.startMs, ",")} --> ${formatTimestamp(cue.endMs, ",")}${cue.settings ? ` ${cue.settings}` : ""}\n${cue.text}`,
)
.join("\n\n")}\n`;
}
function serializeVtt(document: SubtitleDocument): string {
const preamble =
document.format === "vtt" && document.preamble.join("\n").trim()
? `${document.preamble.join("\n").trim()}\n\n`
: "";
const body = document.cues
.map(
(cue) =>
`${cue.id ? `${cue.id}\n` : ""}${formatTimestamp(cue.startMs, ".")} --> ${formatTimestamp(cue.endMs, ".")}${cue.settings ? ` ${cue.settings}` : ""}\n${cue.text}`,
)
.join("\n\n");
return `WEBVTT\n\n${preamble}${body}\n`;
}
function minimalAssPreamble(): string[] {
return [
"[Script Info]",
"ScriptType: v4.00+",
"WrapStyle: 0",
"ScaledBorderAndShadow: yes",
"",
"[V4+ Styles]",
"Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding",
"Style: Default,Arial,42,&H00FFFFFF,&H000000FF,&H00000000,&H64000000,0,0,0,0,100,100,0,0,1,2,0,2,40,40,30,1",
"",
"[Events]",
`Format: ${DEFAULT_ASS_FORMAT.join(", ")}`,
];
}
function serializeAss(document: SubtitleDocument): string {
const format =
document.format === "ass" && document.assFormat?.length
? document.assFormat
: DEFAULT_ASS_FORMAT;
const preamble =
document.format === "ass" ? [...document.preamble] : minimalAssPreamble();
let eventsIndex = preamble.findIndex((line) =>
/^\s*\[Events\]\s*$/iu.test(line),
);
if (eventsIndex < 0) {
preamble.push("", "[Events]");
eventsIndex = preamble.length - 1;
}
const nextSectionIndex = preamble.findIndex(
(line, index) => index > eventsIndex && /^\s*\[[^\]]+\]\s*$/u.test(line),
);
const eventsEnd = nextSectionIndex < 0 ? preamble.length : nextSectionIndex;
const hasEventsFormat = preamble
.slice(eventsIndex + 1, eventsEnd)
.some((line) => /^\s*Format\s*:/iu.test(line));
if (!hasEventsFormat)
preamble.splice(eventsIndex + 1, 0, `Format: ${format.join(", ")}`);
const dialogue = document.cues.map((cue) => {
const values = format.map((field) => {
const key = field.toLowerCase();
if (key === "start") return formatAssTimestamp(cue.startMs);
if (key === "end") return formatAssTimestamp(cue.endMs);
if (key === "text") return cue.text.replaceAll("\n", "\\N");
return (
cue.assFields?.[key] ??
{
layer: "0",
style: "Default",
name: "",
marginl: "0",
marginr: "0",
marginv: "0",
effect: "",
}[key] ??
""
);
});
return `Dialogue: ${values.join(",")}`;
});
return `${preamble.join("\n").replace(/\n+$/u, "")}\n${dialogue.join("\n")}\n`;
}
export function serializeSubtitle(
document: SubtitleDocument,
format: SubtitleFormat,
): string {
if (document.cues.length > MAX_CUES)
throw new Error("Subtitle exceeds 100,000 cues.");
return format === "vtt"
? serializeVtt(document)
: format === "ass"
? serializeAss(document)
: serializeSrt(document);
}
export interface RevisionChange {
kind: "added" | "removed" | "timing" | "text" | "timing-and-text";
index: number;
before?: Cue;
after?: Cue;
}
export function compareDocuments(
before: SubtitleDocument,
after: SubtitleDocument,
): RevisionChange[] {
if (before.cues.length + after.cues.length > 100_000)
throw new Error("Revision comparison is limited to 100,000 combined cues.");
const changes: RevisionChange[] = [];
const count = Math.max(before.cues.length, after.cues.length);
for (let index = 0; index < count; index += 1) {
const left = before.cues[index];
const right = after.cues[index];
if (!left && right) changes.push({ kind: "added", index, after: right });
else if (left && !right)
changes.push({ kind: "removed", index, before: left });
else if (left && right) {
const timing =
left.startMs !== right.startMs || left.endMs !== right.endMs;
const text = left.text !== right.text;
if (timing || text)
changes.push({
kind: timing && text ? "timing-and-text" : timing ? "timing" : "text",
index,
before: left,
after: right,
});
}
}
return changes;
}
export function documentSummary(document: SubtitleDocument) {
let first = 0;
let last = 0;
let textCharacters = 0;
if (document.cues.length) {
first = document.cues[0]!.startMs;
last = document.cues[0]!.endMs;
for (const cue of document.cues) {
first = Math.min(first, cue.startMs);
last = Math.max(last, cue.endMs);
textCharacters += plainText(cue.text).length;
}
}
return {
format: document.format,
cues: document.cues.length,
firstMs: first,
lastMs: last,
durationMs: Math.max(0, last - first),
textCharacters,
};
}
src/test/setup.ts
+8
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import "@testing-library/jest-dom/vitest";
import { afterEach } from "vitest";
import { cleanup } from "@testing-library/react";
afterEach(() => {
cleanup();
localStorage.clear();
});
src/toolbox/manifest.source.json
+41
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{
"$schema": "https://git.add-ideas.de/lotobo/toolbox-sdk/raw/branch/main/schemas/toolbox-app.v1.schema.json",
"schemaVersion": 1,
"id": "de.add-ideas.subtitle-tools",
"name": "Subtitle Tools",
"version": "0.1.0",
"description": "Edit, validate, synchronize, compare, and convert subtitles locally.",
"entry": "./",
"icon": "./favicon.svg",
"categories": ["media", "text", "productivity"],
"tags": ["subtitles", "captions", "srt", "webvtt", "ass", "timing"],
"integration": {
"contextVersion": 1,
"launchModes": ["navigate", "new-tab"],
"embedding": "unsupported"
},
"requirements": {
"secureContext": false,
"workers": false,
"indexedDb": false,
"crossOriginIsolated": false,
"topLevelContext": false
},
"privacy": {
"processing": "local",
"fileUploads": true,
"telemetry": false,
"label": "Inputs stay in this browser; nothing is uploaded."
},
"source": {
"repository": "https://git.add-ideas.de/lotobo/subtitle-tools",
"license": "GPL-3.0-or-later"
},
"actions": [
{
"id": "source",
"label": "Source",
"url": "https://git.add-ideas.de/lotobo/subtitle-tools"
}
]
}
src/toolbox/manifest.ts
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import { defineToolboxApp, parseToolboxApp } from "@add-ideas/toolbox-contract";
import source from "./manifest.source.json";
export const manifest = defineToolboxApp(parseToolboxApp(source));
src/version.ts
+1
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export const APP_VERSION = "0.1.0";
src/vite-env.d.ts
Vendored
+1
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@@ -0,0 +1 @@
/// <reference types="vite/client" />
tests/browser/app.spec.ts
+79
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import { expect, test, type Page } from "@playwright/test";
const ORIGIN = "http://127.0.0.1:4197";
async function localOnly(page: Page) {
const external: string[] = [];
await page.route("**/*", async (route) => {
const url = new URL(route.request().url());
if (
(url.protocol === "http:" || url.protocol === "https:") &&
url.origin !== ORIGIN
) {
external.push(url.href);
await route.abort();
} else await route.continue();
});
return external;
}
test("runs from a nested path without external requests", async ({ page }) => {
const errors: string[] = [];
page.on("pageerror", (error) => errors.push(error.message));
page.on("console", (message) => {
if (message.type() === "error") errors.push(message.text());
});
const external = await localOnly(page);
await page.goto("/deep/nested/subtitle/");
await expect(
page.getByRole("heading", { name: "Subtitle Tools" }),
).toBeVisible();
await expect(page.getByText("No network requests")).toBeVisible();
expect(external).toEqual([]);
expect(errors).toEqual([]);
});
test("parses, validates, edits and converts the example", async ({ page }) => {
const external = await localOnly(page);
await page.goto("/deep/nested/subtitle/");
await expect(page.getByText("SRT", { exact: true })).toBeVisible();
await page.getByRole("tab", { name: "Cues & checks" }).click();
await expect(page.getByText("overlap", { exact: true })).toBeVisible();
await page.getByLabel("Text").fill("Edited locally");
await page.getByRole("tab", { name: "Source & export" }).click();
await page.getByLabel("Output format").selectOption("vtt");
await expect(page.getByLabel("Export preview")).toHaveValue(/WEBVTT/u);
await expect(page.getByLabel("Export preview")).toHaveValue(
/Edited locally/u,
);
expect(external).toEqual([]);
});
test("applies a bounded timing shift", async ({ page }) => {
await page.goto("/deep/nested/subtitle/");
await page.getByRole("tab", { name: "Timing" }).click();
await page.getByLabel("Shift (ms)").fill("500");
await page.getByRole("button", { name: "Apply timing transform" }).click();
await page.getByRole("tab", { name: "Cues & checks" }).click();
await expect(page.getByText(/00:00:01\.500/u).first()).toBeVisible();
});
test("serves release identity and hardened local-only headers", async ({
request,
}) => {
const index = await request.get("/deep/nested/subtitle/");
expect(index.ok()).toBe(true);
expect(index.headers()["content-security-policy"]).toContain(
"connect-src 'self'",
);
expect(index.headers()["content-security-policy"]).not.toMatch(
/connect-src[^;]*https?:/u,
);
expect(await index.text()).not.toMatch(/\b(?:src|href)=["']\//u);
const manifest = await request.get("/deep/nested/subtitle/toolbox-app.json");
await expect(manifest.json()).resolves.toMatchObject({
id: "de.add-ideas.subtitle-tools",
version: "0.1.0",
entry: "./",
privacy: { processing: "local", telemetry: false },
});
});
tests/components/app.test.tsx
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import { render, screen } from "@testing-library/react";
import { describe, expect, it, vi } from "vitest";
import { App } from "../../src/App";
describe("Subtitle Tools", () => {
it("renders the local workbench and standard shell", async () => {
vi.stubGlobal(
"fetch",
vi.fn(async () => new Response("Not found", { status: 404 })),
);
render(<App />);
expect(
await screen.findByRole("heading", { name: "Subtitle Tools" }),
).toBeVisible();
expect(await screen.findByText("No network requests")).toBeVisible();
expect(screen.getByRole("tab", { name: "Timing" })).toBeVisible();
});
});
tests/subtitle/model.test.ts
+97
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import { describe, expect, it } from "vitest";
import {
compareDocuments,
convertFrameRate,
parseSubtitle,
serializeSubtitle,
transformTiming,
validateDocument,
} from "../../src/subtitle/model";
const SRT = `1\r\n00:00:01,000 --> 00:00:02,500\r\nHello world\r\n\r\n2\r\n00:00:02,400 --> 00:00:04,000\r\nSecond cue\r\n`;
describe("subtitle model", () => {
it("parses SRT and reports overlap", () => {
const document = parseSubtitle(SRT);
expect(document.format).toBe("srt");
expect(document.cues).toHaveLength(2);
expect(document.cues[0]).toMatchObject({
startMs: 1000,
endMs: 2500,
text: "Hello world",
});
expect(
validateDocument(document).some((issue) => issue.code === "overlap"),
).toBe(true);
});
it("round-trips WebVTT identifiers, settings and notes", () => {
const source = `WEBVTT - sample\n\nNOTE inert note\nline two\n\nc1\n00:00:01.000 --> 00:00:02.000 align:start\n<v Ada>Hello</v>\n`;
const document = parseSubtitle(source);
expect(document).toMatchObject({ format: "vtt" });
expect(document.cues[0]).toMatchObject({
id: "c1",
settings: "align:start",
});
const serialized = serializeSubtitle(document, "vtt");
expect(serialized).toContain("NOTE inert note");
expect(serialized).toContain("align:start");
expect(parseSubtitle(serialized).cues[0]?.text).toBe("<v Ada>Hello</v>");
});
it("parses ASS dialogue fields containing commas and preserves styles", () => {
const source = `[Script Info]\nScriptType: v4.00+\n\n[V4+ Styles]\nFormat: Name, Fontname\nStyle: Loud,Arial\n\n[Events]\nFormat: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\nDialogue: 0,0:00:01.00,0:00:03.25,Loud,Ada,0,0,0,,Hello, world\\Nagain\n`;
const document = parseSubtitle(source);
expect(document.format).toBe("ass");
expect(document.cues[0]).toMatchObject({
startMs: 1000,
endMs: 3250,
text: "Hello, world\nagain",
});
const serialized = serializeSubtitle(document, "ass");
expect(serialized).toContain("Dialogue: 0,0:00:01.00,0:00:03.25,Loud");
expect(serialized).toContain("Hello, world\\Nagain");
});
it("writes an Events format even when only a style format was supplied", () => {
const source = `[Script Info]\nScriptType: v4.00+\n\n[V4+ Styles]\nFormat: Name, Fontname\nStyle: Default,Arial\n\n[Events]\nDialogue: 0,0:00:01.00,0:00:02.00,Default,,0,0,0,,Hello\n`;
const serialized = serializeSubtitle(parseSubtitle(source), "ass");
expect(serialized).toMatch(
/\[Events\]\nFormat: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text/u,
);
expect(parseSubtitle(serialized).cues).toHaveLength(1);
});
it("converts formats and timing without silently creating negatives", () => {
const document = parseSubtitle(SRT);
expect(() => transformTiming(document, { shiftMs: -2000 })).toThrow(
/negative/u,
);
const clamped = transformTiming(document, {
shiftMs: -2000,
clampToZero: true,
});
expect(clamped.cues[0]?.startMs).toBe(0);
const converted = convertFrameRate(document, 25, 50);
expect(converted.cues[0]).toMatchObject({ startMs: 500, endMs: 1250 });
expect(serializeSubtitle(converted, "vtt")).toMatch(/^WEBVTT/u);
});
it("compares revisions deterministically", () => {
const before = parseSubtitle(SRT);
const after = parseSubtitle(SRT.replace("Hello world", "Hello again"));
expect(compareDocuments(before, after)).toMatchObject([
{ index: 0, kind: "text" },
]);
});
it("rejects pathological input bounds", () => {
expect(() => parseSubtitle("x".repeat(4_000_001))).toThrow(/4,000,000/u);
expect(() =>
parseSubtitle(`1\n00:61:00,000 --> 00:61:01,000\nBad`),
).not.toThrow();
expect(
parseSubtitle(`1\n00:61:00,000 --> 00:61:01,000\nBad`).cues,
).toHaveLength(0);
});
});
tsconfig.app.json
+27
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{
"compilerOptions": {
"tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
"target": "ES2023",
"lib": ["ES2023", "DOM", "DOM.Iterable"],
"module": "ESNext",
"types": ["vite/client"],
"allowArbitraryExtensions": true,
"skipLibCheck": true,
"moduleResolution": "Bundler",
"allowImportingTsExtensions": true,
"verbatimModuleSyntax": true,
"moduleDetection": "force",
"noEmit": true,
"jsx": "react-jsx",
"noUnusedLocals": true,
"noUnusedParameters": true,
"erasableSyntaxOnly": true,
"noFallthroughCasesInSwitch": true,
"strict": true,
"noUncheckedIndexedAccess": true,
"useDefineForClassFields": true,
"resolveJsonModule": true,
"isolatedModules": true
},
"include": ["src", "tests"]
}
tsconfig.json
+11
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{
"files": [],
"references": [
{
"path": "./tsconfig.app.json"
},
{
"path": "./tsconfig.node.json"
}
]
}
tsconfig.node.json
+24
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{
"compilerOptions": {
"tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
"target": "ES2023",
"lib": ["ES2023"],
"module": "ESNext",
"types": ["node"],
"skipLibCheck": true,
"moduleResolution": "Bundler",
"allowImportingTsExtensions": true,
"verbatimModuleSyntax": true,
"moduleDetection": "force",
"noEmit": true,
"strict": true,
"noUnusedLocals": true,
"noUnusedParameters": true
},
"include": [
"vite.config.ts",
"playwright.config.ts",
"eslint.config.mjs",
"scripts/**/*.mjs"
]
}
vite.config.ts
+16
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/// <reference types="vitest/config" />
import { defineConfig } from "vite";
import react from "@vitejs/plugin-react";
export default defineConfig({
base: "./",
plugins: [react()],
test: {
environment: "jsdom",
setupFiles: "./src/test/setup.ts",
css: true,
maxWorkers: 2,
restoreMocks: true,
exclude: ["tests/browser/**", "node_modules/**", "dist/**"],
},
});