From 497b061b92ae3e4fd503a6d70934e71156a1507f Mon Sep 17 00:00:00 2001 From: mux Date: Fri, 31 Oct 2025 10:10:40 -0300 Subject: [PATCH] initial commit --- LICENSE | 662 +++++++++++++++++++++++++++++++++++++++++++ deno.json | 16 ++ deno.lock | 55 ++++ scripts/copyright.ts | 31 ++ src/html.ts | 104 +++++++ src/http.ts | 118 ++++++++ src/main.ts | 29 ++ src/stream.ts | 137 +++++++++ 8 files changed, 1152 insertions(+) create mode 100644 LICENSE create mode 100644 deno.json create mode 100644 deno.lock create mode 100755 scripts/copyright.ts create mode 100644 src/html.ts create mode 100644 src/http.ts create mode 100644 src/main.ts create mode 100644 src/stream.ts diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..2beb9e1 --- /dev/null +++ b/LICENSE @@ -0,0 +1,662 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + 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 AGPL, see +. + diff --git a/deno.json b/deno.json new file mode 100644 index 0000000..02289d8 --- /dev/null +++ b/deno.json @@ -0,0 +1,16 @@ +{ + "tasks": { + "dev": "deno run --allow-net src/main.ts" + }, + "lint": { + "rules": { + "tags": [ + "recommended" + ], + "exclude": ["no-explicit-any", "require-await"] + } + }, + "imports": { + "@std/assert": "jsr:@std/assert@1" + } +} diff --git a/deno.lock b/deno.lock new file mode 100644 index 0000000..b058552 --- /dev/null +++ b/deno.lock @@ -0,0 +1,55 @@ +{ + "version": "5", + "specifiers": { + "jsr:@std/assert@1": "1.0.15", + "jsr:@std/internal@^1.0.12": "1.0.12" + }, + 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"https://deno.land/std@0.224.0/path/posix/join.ts": "7fc2cb3716aa1b863e990baf30b101d768db479e70b7313b4866a088db016f63", + "https://deno.land/std@0.224.0/path/posix/normalize.ts": "baeb49816a8299f90a0237d214cef46f00ba3e95c0d2ceb74205a6a584b58a91", + "https://deno.land/std@0.224.0/path/windows/_util.ts": "d5f47363e5293fced22c984550d5e70e98e266cc3f31769e1710511803d04808", + "https://deno.land/std@0.224.0/path/windows/basename.ts": "6bbc57bac9df2cec43288c8c5334919418d784243a00bc10de67d392ab36d660", + "https://deno.land/std@0.224.0/path/windows/from_file_url.ts": "ced2d587b6dff18f963f269d745c4a599cf82b0c4007356bd957cb4cb52efc01", + "https://deno.land/std@0.224.0/path/windows/join.ts": "8d03530ab89195185103b7da9dfc6327af13eabdcd44c7c63e42e27808f50ecf", + "https://deno.land/std@0.224.0/path/windows/normalize.ts": "78126170ab917f0ca355a9af9e65ad6bfa5be14d574c5fb09bb1920f52577780" + }, + "workspace": { + "dependencies": [ + "jsr:@std/assert@1" + ] + } +} diff --git a/scripts/copyright.ts b/scripts/copyright.ts new file mode 100755 index 0000000..56b7afd --- /dev/null +++ b/scripts/copyright.ts @@ -0,0 +1,31 @@ +#!/usr/bin/env -S deno run --allow-read --allow-write +/** + * Copyright (c) 2025 xwra + * SPDX-License-Identifier: AGPL-3.0-or-later + */ + +import { walk } from "https://deno.land/std/fs/walk.ts"; + +const copyrightHeader = `/** + * Copyright (c) 2025 xwra + * SPDX-License-Identifier: AGPL-3.0-or-later + */ +`; + +const dir = "./"; + +for await ( + const entry of walk(dir, { + exts: [".ts", ".tsx"], + includeDirs: false, + skip: [/node_modules/, /copyright\.ts$/], + }) +) { + const filePath = entry.path; + const content = await Deno.readTextFile(filePath); + + if (!content.startsWith(copyrightHeader)) { + await Deno.writeTextFile(filePath, copyrightHeader + "\n" + content); + console.log(`Added header to ${filePath}`); + } +} diff --git a/src/html.ts b/src/html.ts new file mode 100644 index 0000000..3aa52a9 --- /dev/null +++ b/src/html.ts @@ -0,0 +1,104 @@ +/** + * Copyright (c) 2025 xwra + * SPDX-License-Identifier: AGPL-3.0-or-later + */ + +import { type Chunk, ChunkedWriter } from "./http.ts"; +import { ChunkedStream } from "./stream.ts"; + +type Attrs = Record; + +const SELF_CLOSING_TAGS = new Set([ + "br", + "embed", + "hr", + "img", + "input", + "link", + "meta", + "track", + "source", +]); + +export function escape(input: string): string { + return input + .replace(/&/g, "&") + .replace(//g, ">") + .replace(/"/g, """) + .replace(/'/g, "'"); +} + +function attrsToString( + attrs: Attrs | undefined, + escape: (str: string) => string, +): string { + if (!attrs) return ""; + const pairs = Object.entries(attrs) + .filter(([_, value]) => value !== undefined && value !== null) + .map(([key, value]) => { + if (value === true) return key; + if (value === false) return ""; + return `${key}="${escape(String(value))}"`; + }) + .filter(Boolean); + return pairs.length ? " " + pairs.join(" ") : ""; +} + +type TagFunction = { + (attrs: Attrs, ...children: Chunk[]): Promise; + (...children: Chunk[]): Promise; +}; + +type HtmlBuilder = { + [K: string]: TagFunction; +}; + +export function html( + chunks: ChunkedStream, + write: ChunkedWriter, +): HtmlBuilder { + const tags = new Map Promise>(); + + const handler: ProxyHandler> = { + get(_, tag: string) { + if (tags.has(tag)) { + return tags.get(tag); + } + + const fn = async (...args: (Chunk | Attrs)[]) => { + const isTemplate = args.length === 1 && Array.isArray(args[0]) && + "raw" in args[0]; + const hasAttrs = !isTemplate && args.length && + typeof args[0] === "object"; + + const attrs: Attrs | undefined = hasAttrs + ? args.shift() as Attrs + : undefined; + const children: Chunk[] = args as Chunk[]; + + const attributes = attrsToString(attrs, escape); + const isSelfClosing = SELF_CLOSING_TAGS.has(tag.toLowerCase()); + if (!isSelfClosing && !children.length) return; + chunks.write(`<${tag}${attributes}${isSelfClosing ? " /" : ""}>`); + + if (!isSelfClosing) { + if (isTemplate) { + await (write as any)(...children); + } else { + for (const child of children) { + typeof child === "function" + ? await (child as any)() + : chunks.write(String(await child)); + } + } + chunks.write(``); + } + }; + + tags.set(tag, fn); + return fn; + }, + }; + return new Proxy({}, handler); +} diff --git a/src/http.ts b/src/http.ts new file mode 100644 index 0000000..268de93 --- /dev/null +++ b/src/http.ts @@ -0,0 +1,118 @@ +/** + * Copyright (c) 2025 xwra + * SPDX-License-Identifier: AGPL-3.0-or-later + */ + +import { ChunkedStream } from "./stream.ts"; + +export interface StreamOptions { + headContent?: string; + bodyAttributes?: string; + lang?: string; +} + +export type Chunk = + | string + | AsyncIterable + | Promise + | Iterable; + +async function* normalize( + value: Chunk | undefined | null, +): AsyncIterable { + if (value == null) return; + if (typeof value === "string") { + yield value; + } else if (value instanceof Promise) { + const resolved = await value; + if (resolved != null) yield String(resolved); + } else if ( + typeof value === "object" && + (Symbol.asyncIterator in value || Symbol.iterator in value) + ) { + for await (const chunk of value as AsyncIterable) { + if (chunk != null) yield String(chunk); + } + } else { + yield String(value); + } +} + +export type ChunkedWriter = ( + strings: TemplateStringsArray, + ...values: Chunk[] +) => Promise; + +export function makeChunkWriter(stream: ChunkedStream): ChunkedWriter { + const emit = (chunk: string) => { + if (stream.closed) return; + chunk === "EOF" ? stream.close() : stream.write(chunk); + }; + + return async function (strings: TemplateStringsArray, ...values: Chunk[]) { + for (let i = 0; i < strings.length; i++) { + if (strings[i]) emit(strings[i]); + for await (const chunk of normalize(values[i])) { + emit(chunk); + } + } + }; +} + +export function chunkedHtml(): { + chunks: ChunkedStream; + stream: ReadableStream; +} { + const encoder = new TextEncoder(); + const chunks = new ChunkedStream(); + + const stream = new ReadableStream({ + async pull(controller) { + if (chunks.closed) return; + const result = await chunks.next(); + result.done + ? controller.close() + : controller.enqueue(encoder.encode(result.value)); + }, + cancel() { + chunks.close(); + }, + }); + + return { chunks, stream }; +} + +export async function createHtmlStream(options: StreamOptions = {}) { + const { chunks, stream } = chunkedHtml(); + const writer = makeChunkWriter(chunks); + + await writer` + + + + +${options.headContent || ""} + +`; + + return { + write: writer, + stream, + chunks, + close() { + if (chunks.closed) return; + chunks.write(""); + chunks.close(); + }, + get response(): Response { + return new Response(stream, { + headers: { + "Content-Type": "text/html; charset=utf-8", + "Transfer-Encoding": "chunked", + "Cache-Control": "no-cache", + "Connection": "keep-alive", + }, + }); + }, + }; +} diff --git a/src/main.ts b/src/main.ts new file mode 100644 index 0000000..28cb658 --- /dev/null +++ b/src/main.ts @@ -0,0 +1,29 @@ +/** + * Copyright (c) 2025 xwra + * SPDX-License-Identifier: AGPL-3.0-or-later + */ + +import { html } from "./html.ts"; +import { createHtmlStream } from "./http.ts"; + +Deno.serve({ + port: 8080, + async handler() { + const stream = await createHtmlStream({ lang: "en" }); + const { h1, p, li } = html(stream.chunks, stream.write); + + await h1`

Normal Streaming Page

`; + await p({ class: "oh hey" }, "meowing chunk by chunk"); + + (async () => { + const fruits = ["Apple", "Banana", "Cherry"]; + + for (const fruit of fruits) { + await new Promise((r) => setTimeout(r, 500)); + await li(fruit); + } + })(); + + return stream.response; + }, +}); diff --git a/src/stream.ts b/src/stream.ts new file mode 100644 index 0000000..78081b3 --- /dev/null +++ b/src/stream.ts @@ -0,0 +1,137 @@ +/** + * Copyright (c) 2025 xwra + * SPDX-License-Identifier: AGPL-3.0-or-later + */ + +export class ChunkedStream implements AsyncIterable { + private readonly chunks: T[] = []; + private readonly queue: ((result: IteratorResult) => void)[] = []; + private _closed = false; + + get closed(): boolean { + return this._closed; + } + + write(chunk: T): void { + if (this._closed) throw new Error("Cannot write to closed stream"); + this.queue.shift()?.({ value: chunk, done: false }) ?? + this.chunks.push(chunk); + } + + close(): void { + this._closed = true; + this.queue.splice(0).forEach((r) => r({ value: undefined, done: true })); + } + + next(): Promise> { + if (this.chunks.length) { + return Promise.resolve({ + value: this.chunks.shift()!, + done: false, + }); + } + if (this._closed) { + return Promise.resolve({ + value: undefined as any, + done: true, + }); + } + return new Promise((resolve) => this.queue.push(resolve)); + } + + [Symbol.asyncIterator](): AsyncIterableIterator { + return this; + } +} + +export async function* mapStream( + source: AsyncIterable, + fn: (chunk: T, index: number) => U | Promise, +): AsyncIterable { + let index = 0; + for await (const chunk of source) { + yield await fn(chunk, index++); + } +} + +export async function* filterStream( + source: AsyncIterable, + predicate: (chunk: T, index: number) => boolean | Promise, +): AsyncIterable { + let index = 0; + for await (const chunk of source) { + if (await predicate(chunk, index++)) { + yield chunk; + } + } +} + +export async function* composeStreams( + ...sources: AsyncIterable[] +): AsyncIterable { + for (const source of sources) { + yield* source; + } +} + +export async function* takeStream( + source: AsyncIterable, + count: number, +): AsyncIterable { + let taken = 0; + for await (const chunk of source) { + if (taken++ >= count) break; + yield chunk; + } +} + +export async function* skipStream( + source: AsyncIterable, + count: number, +): AsyncIterable { + let skipped = 0; + for await (const chunk of source) { + if (skipped++ >= count) { + yield chunk; + } + } +} + +export async function* batchStream( + source: AsyncIterable, + size: number, +): AsyncIterable { + let batch: T[] = []; + + for await (const chunk of source) { + batch.push(chunk); + if (batch.length >= size) { + yield batch, batch = []; + } + } + + if (batch.length > 0) { + yield batch; + } +} + +export async function* flatMapStream( + source: AsyncIterable, + fn: (chunk: T, index: number) => AsyncIterable | Iterable, +): AsyncIterable { + let index = 0; + for await (const chunk of source) { + yield* fn(chunk, index++); + } +} + +export async function* tapStream( + source: AsyncIterable, + fn: (chunk: T, index: number) => void | Promise, +): AsyncIterable { + let index = 0; + for await (const chunk of source) { + yield chunk; + await fn(chunk, index++); + } +}