From 81901bedc6c566c9addbe33e475db5eeafe7fb8a Mon Sep 17 00:00:00 2001 From: rod-lin Date: Mon, 4 Nov 2019 00:00:51 -0600 Subject: [PATCH] init --- .babelrc | 4 + .gitignore | 108 ++++ Makefile | 16 + main.html | 11 + main.js | 32 ++ package-lock.json | 1263 +++++++++++++++++++++++++++++++++++++++++++++ package.json | 20 + src/ansi.ts | 133 +++++ src/canvas.ts | 252 +++++++++ src/input.ts | 101 ++++ src/renderer.ts | 43 ++ src/source.ts | 38 ++ src/terminal.ts | 148 ++++++ src/unicode.ts | 9 + src/utils.ts | 15 + 15 files changed, 2193 insertions(+) create mode 100644 .babelrc create mode 100644 .gitignore create mode 100644 Makefile create mode 100644 main.html create mode 100644 main.js create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 src/ansi.ts create mode 100644 src/canvas.ts create mode 100644 src/input.ts create mode 100644 src/renderer.ts create mode 100644 src/source.ts create mode 100644 src/terminal.ts create mode 100644 src/unicode.ts create mode 100644 src/utils.ts diff --git a/.babelrc b/.babelrc new file mode 100644 index 0000000..3ba5849 --- /dev/null +++ b/.babelrc @@ -0,0 +1,4 @@ +{ + "presets": ["@babel/preset-typescript", "@babel/preset-env"], + "plugins": ["@babel/plugin-proposal-class-properties"] +} diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..e48fe8a --- /dev/null +++ b/.gitignore @@ -0,0 +1,108 @@ +# Logs +logs +*.log +npm-debug.log* +yarn-debug.log* +yarn-error.log* +lerna-debug.log* + +# Diagnostic reports (https://nodejs.org/api/report.html) +report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json + +# Runtime data +pids +*.pid +*.seed +*.pid.lock + +# Directory for instrumented libs generated by jscoverage/JSCover +lib-cov + +# Coverage directory used by tools like istanbul +coverage +*.lcov + +# nyc test coverage +.nyc_output + +# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files) +.grunt + +# Bower dependency directory (https://bower.io/) +bower_components + +# node-waf configuration +.lock-wscript + +# Compiled binary addons (https://nodejs.org/api/addons.html) +build/Release + +# Dependency directories +node_modules/ +jspm_packages/ + +# TypeScript v1 declaration files +typings/ + +# TypeScript cache +*.tsbuildinfo + +# Optional npm cache directory +.npm + +# Optional eslint cache +.eslintcache + +# Microbundle cache +.rpt2_cache/ +.rts2_cache_cjs/ +.rts2_cache_es/ +.rts2_cache_umd/ + +# Optional REPL history +.node_repl_history + +# Output of 'npm pack' +*.tgz + +# Yarn Integrity file +.yarn-integrity + +# dotenv environment variables file +.env +.env.test + +# parcel-bundler cache (https://parceljs.org/) +.cache + +# Next.js build output +.next + +# Nuxt.js build / generate output +.nuxt +dist + +# Gatsby files +.cache/ +# Comment in the public line in if your project uses Gatsby and *not* Next.js +# https://nextjs.org/blog/next-9-1#public-directory-support +# public + +# vuepress build output +.vuepress/dist + +# Serverless directories +.serverless/ + +# FuseBox cache +.fusebox/ + +# DynamoDB Local files +.dynamodb/ + +# TernJS port file +.tern-port + +# build +build/ +lib/ diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..6d741e6 --- /dev/null +++ b/Makefile @@ -0,0 +1,16 @@ +SRC = $(wildcard src/*.ts) +BUILD = $(SRC:src/%.ts=build/%.js) +ENTRYPOINT = build/terminal.js +TARGET = lib/yterm.js + +$(TARGET): $(BUILD) + mkdir -p $(@D) + browserify $(ENTRYPOINT) -o $(TARGET) + +build/%.js: src/%.ts .babelrc + mkdir -p $(@D) + babel $< -o $@ + +.PHONY: clean +clean: + rm -rf build $(TARGET) diff --git a/main.html b/main.html new file mode 100644 index 0000000..0a35901 --- /dev/null +++ b/main.html @@ -0,0 +1,11 @@ + + + + + + + +
+ + + diff --git a/main.js b/main.js new file mode 100644 index 0000000..3910662 --- /dev/null +++ b/main.js @@ -0,0 +1,32 @@ +const pty = require("node-pty"); +const ws = require("ws"); + +const server = new ws.Server({ host: "localhost", port: 3131 }); +const processes = new Set(); + +server.on("connection", ws => { + const proc = pty.spawn("bash"); + + processes.add(proc); + + proc.on("data", data => { + ws.send(data); + }); + + ws.on("message", msg => { + proc.write(msg); + }); + + ws.on("close", msg => { + proc.kill(); + processes.delete(proc); + }); +}); + +process.on("exit", () => { + console.log("killing all processes"); + + for (const proc of processes) { + proc.kill(); + } +}); diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..030fd32 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1263 @@ +{ + "name": "yterm", + "version": "0.0.1", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "@babel/code-frame": { + "version": 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@@ -0,0 +1,20 @@ +{ + "name": "yterm", + "version": "0.0.1", + "description": "", + "main": "main.js", + "scripts": {}, + "author": "", + "license": "MIT", + "devDependencies": { + "@babel/core": "^7.6.4", + "@babel/plugin-proposal-class-properties": "^7.5.5", + "@babel/preset-env": "^7.6.3", + "@babel/preset-typescript": "^7.6.0", + "babel-core": "^7.0.0-bridge.0" + }, + "dependencies": { + "node-pty": "^0.9.0", + "ws": "^7.2.0" + } +} diff --git a/src/ansi.ts b/src/ansi.ts new file mode 100644 index 0000000..5bccbac --- /dev/null +++ b/src/ansi.ts @@ -0,0 +1,133 @@ +// base class for ANSI sequence +export enum ANSICommand { + ESC_TITLE, + ESC_GRAPHIC_RENDITION, + ESC_ERASE_IN_LINE, + ESC_SET_DIMENSIONS, + + CTRL_BELL, + CTRL_BACKSPACE, + CTRL_TAB, + CTRL_CARRIAGE_RETURN +}; + +export class ANSISequence { + public cmd: ANSICommand; + public args: Array; + + constructor (cmd: ANSICommand, args: Array) { + this.cmd = cmd; + this.args = args; + } +}; + +const escapeSequences = [ + { + pattern: /^\x1b]0;([^\x1b\x07]+)\x07/, + handler: (match: RegExpExecArray) => { + return new ANSISequence(ANSICommand.ESC_TITLE, [match[1]]); + } + }, + + { + pattern: /^\x1b\[((\d+)?(;(\d+)?)*)m/, + handler: (match: RegExpExecArray) => { + const modes = match[1].split(";"); + const args = []; + + for (const mode of modes) { + if (mode === "") { + args.push(0); + } else { + args.push(parseInt(mode)); + } + } + + return new ANSISequence(ANSICommand.ESC_GRAPHIC_RENDITION, args);; + } + }, + + { + pattern: /^\x1b\[(\d?)K/, + handler: (match: RegExpExecArray) => { + return new ANSISequence(ANSICommand.ESC_ERASE_IN_LINE, [parseInt(match[1])]); + } + }, + + { + pattern: /^\x1b\[8;(\d+);(\d+)t/, + handler: (match: RegExpExecArray) => { + return new ANSISequence(ANSICommand.ESC_SET_DIMENSIONS, [parseInt(match[1]), parseInt(match[2])]); + } + }, + + { + pattern: /^\x07/, + handler: () => { + return new ANSISequence(ANSICommand.CTRL_BELL, []); + } + }, + + { + pattern: /^\x08/, + handler: () => { + return new ANSISequence(ANSICommand.CTRL_BACKSPACE, []); + } + }, + + { + pattern: /^\x09/, + handler: () => { + return new ANSISequence(ANSICommand.CTRL_TAB, []); + } + }, + + { + pattern: /^\x0d/, + handler: () => { + return new ANSISequence(ANSICommand.CTRL_CARRIAGE_RETURN, []); + } + } +]; + +// // parse a chunk of data into a list of either control sequences or raw strings +export function parseANSISequence (data: string): Array { + const chunks = []; + let standingChunk = ""; + + console.log([...data].map(c => c.charCodeAt(0))); + + while (data.length) { + const pos = data.search(/\x1b|\x07|\x08|\x09|\x0d/); + let match = null; + + if (pos == -1) { + standingChunk += data; + break; + } + + standingChunk += data.substring(0, pos); + data = data.substring(pos); + + for (const { pattern, handler } of escapeSequences) { + match = pattern.exec(data); + + if (match !== null) { + chunks.push(handler(match)); + data = data.substring(match[0].length); + break; + } + } + + if (!match) { + standingChunk += data.substring(0, 1); + data = data.substring(1); + } + } + + if (standingChunk !== "") { + chunks.push(standingChunk); + } + + return chunks; +}; diff --git a/src/canvas.ts b/src/canvas.ts new file mode 100644 index 0000000..637e7be --- /dev/null +++ b/src/canvas.ts @@ -0,0 +1,252 @@ +import { Pair, assert } from "./utils"; +import { Renderer, Font, Color, Block } from "./renderer"; + +export class CanvasRenderer implements Renderer { + private textLayer: HTMLCanvasElement; + private textContext: CanvasRenderingContext2D; + private selectionLayer: HTMLCanvasElement; + private parent: HTMLElement; + + private font: Font; + private columns: number; + private rows: number; // in number of grids + private width: number; + private height: number; + private fontWidth: number; + private fontHeight: number; + private fontDescent: number; // distance from the baseline + + private background: Color; // default background + + private screen: Array>; + + private cursor: Pair; + private cursorIntervalId: number | null; + private cursorInterval: number; + + static blockSpill = 0.7; + + static getContextFont (font: Font): string { + return `${font.getSize()}px ${font.getFamily()}`; + } + + constructor (parent: HTMLElement, columns = 80, rows = 24, font = Font.defaultFont()) { + this.textLayer = document.createElement("canvas"); + this.textContext = this.textLayer.getContext("2d"); + + // this.selectionLayer = document.createElement("canvas"); + this.parent = parent; + + this.background = "#000"; + + parent.appendChild(this.textLayer); + // parent.appendChild(this.selectionLayer); + + this.cursor = null; + this.cursorIntervalId = null; + this.cursorInterval = 800; + + this.setLayout(font, columns, rows); + } + + setGridSize (columns: number, rows: number) { + this.setLayout(this.font, columns, rows); + } + + setLayout (font: Font, columns: number, rows: number) { + // initialize font + this.setFont(font); + + this.columns = columns; + this.width = this.fontWidth * columns; + + this.rows = rows; + this.height = this.fontHeight * rows; + + this.textLayer.width = this.width; + this.textLayer.height = this.height; + + // reinit screen + const oldScreen = this.screen; + + this.clear(); + + for (let i = 0; i < rows; i++) { + for (let j = 0; j < columns; j++) { + if (oldScreen !== undefined && + oldScreen[i] !== undefined && + oldScreen[i][j] !== undefined) { + this.screen[i][j] = oldScreen[i][j]; + } + } + } + + if (this.cursor && !this.isInRange(this.cursor.fst, this.cursor.snd)) { + this.cursor = null; + } + + this.renderAll(); + } + + // set font and measure the dimension of the current font + setFont (font: Font) { + this.textContext.save(); + this.textContext.font = CanvasRenderer.getContextFont(font); + const metrics = this.textContext.measureText("█"); + this.textContext.restore(); + + this.font = font; + this.fontWidth = metrics.width; + this.fontHeight = metrics.actualBoundingBoxAscent + metrics.actualBoundingBoxDescent; + this.fontDescent = metrics.actualBoundingBoxDescent; + } + + getGridSize (): { columns: number, rows: number } { + return { + columns: this.columns, + rows: this.rows + } + } + + getSize (): { height: number, width: number } { + return { + height: this.height, + width: this.width + } + } + + isInRange (column: number, row: number): boolean { + return column >= 0 && column < this.columns && row >= 0 && row < this.rows; + } + + assertIndexInRange (column: number, row: number) { + assert(this.isInRange(column, row), `position (${column}, ${row}) out of bounds`); + } + + // column and row starts from 0 + printBlock (block: Block, column: number, row: number) { + this.assertIndexInRange(column, row); + this.screen[row][column] = block; + this.renderChar(column, row); + } + + printLetter (letter: string, column: number, row: number, foreground = "#fff") { + this.assertIndexInRange(column, row); + this.screen[row][column] = new Block(this.background, foreground, letter); + this.renderChar(column, row); + } + + setCursor (column: number, row: number) { + if (this.cursor) { + // restore the original cursor block + this.renderChar(this.cursor.fst, this.cursor.snd); + } + + this.cursor = new Pair(column, row); + this.renderCursor(); + } + + clear (render = true) { + const newScreen = new Array>(this.rows); + + for (let i = 0; i < this.columns; i++) { + newScreen[i] = new Array(this.columns); + } + + this.screen = newScreen; + + if (render) { + this.renderAll(); + } + } + + // scroll down the screen for n rows + scrollDown (n: number, render = true) { + if (n > this.rows) { + n = this.rows; + } + + this.screen = this.screen.slice(n); + + for (let i = 0; i < n; i++) { + this.screen.push(new Array(this.columns)); + } + + if (this.cursor) { + this.cursor.snd -= n; + + if (!this.isInRange(this.cursor.fst, this.cursor.snd)) { + this.cursor = null; + } + } + + if (render) { + this.renderAll(); + } + } + + // render functions + + renderBlock (block: Block, column: number, row: number) { + this.assertIndexInRange(column, row); + + const x = this.fontWidth * column; + const y = this.fontHeight * row; + const spill = CanvasRenderer.blockSpill; + + this.textContext.save(); + + this.textContext.fillStyle = block ? block.getBackground() : this.background; + this.textContext.fillRect(x - spill, y - spill, this.fontWidth + 2 * spill, this.fontHeight + 2 * spill); // add 0.5 to fill the gap + + this.textContext.fillStyle = block.getForeground(); + this.textContext.font = CanvasRenderer.getContextFont(this.font); + this.textContext.fillText(block.getChar() || "", x, y + this.fontHeight - this.fontDescent); + + this.textContext.restore(); + } + + renderChar (column: number, row: number) { + this.assertIndexInRange(column, row); + this.renderBlock(this.screen[row][column] || new Block(this.background, "#fff"), column, row); + } + + // renderRange content in range + renderRange (column: number, row: number, nColumns: number, nRows: number) { + this.assertIndexInRange(column, row); + this.assertIndexInRange(column + nColumns - 1, row + nRows - 1); + + for (let i = 0; i < nColumns; i++) { + for (let j = 0; j < nRows; j++) { + this.renderChar(i + column, j + row); + } + } + } + + renderCursor () { + if (this.cursorIntervalId === null) { + let on = true; + + this.cursorIntervalId = setInterval(() => { + if (this.cursor) { + const { fst: column, snd: row } = this.cursor; + const block = this.screen[row][column] || new Block(this.background, "#fff"); + const inverseBlock = new Block(block.getForeground(), block.getBackground(), block.getChar()); + + if (on) { + this.renderBlock(inverseBlock, column, row); + } else { + this.renderBlock(block, column, row); + } + } + + on = !on; + }, this.cursorInterval); + } + } + + renderAll () { + this.renderRange(0, 0, this.columns, this.rows); + this.renderCursor(); + } +} diff --git a/src/input.ts b/src/input.ts new file mode 100644 index 0000000..e08cdab --- /dev/null +++ b/src/input.ts @@ -0,0 +1,101 @@ +export class Input { + private handlers: Array<(string) => void>; + + constructor () { + this.handlers = []; + } + + onInput (handler: (string) => void) { + this.handlers.push(handler); + } + + input (data) { + for (const handler of this.handlers) { + handler(data); + } + } +}; + +export class KeyboardEventInput extends Input { + constructor (dom: EventTarget) { + super(); + + dom.addEventListener("keydown", (event: KeyboardEvent) => { + console.log(event.key, event.charCode, event); + + const input = str => { + this.input(str); + + event.preventDefault(); + event.stopImmediatePropagation(); + } + + // ESC [ Pn A Cursor Up + // ESC [ Pn B Cursor Down + // ESC [ Pn C Cursor Right + // ESC [ Pn D Cursor Left + switch (event.key) { + case "Down": + case "ArrowDown": + input("\x1b[1B"); + break; + + case "Up": + case "ArrowUp": + input("\x1b[1A"); + break; + + case "Left": + case "ArrowLeft": + input("\x1b[1D"); + break; + + case "Right": + case "ArrowRight": + input("\x1b[1C"); + break; + + case "Enter": + input("\n"); + break; + + case "Esc": + case "Escape": + break; + + case "Control": + break; + + case "Shift": + break; + + case "Backspace": + input("\x08"); + break; + + case "CapsLock": + // TODO: switch case + break; + + case "Tab": + input("\t"); + break; + + default: + if (event.ctrlKey) { + switch (event.key) { + case "d": + input("\x04"); + break; + + case "c": + input("\x03"); + break; + } + } else { + input(event.key); + } + } + }); + } +} diff --git a/src/renderer.ts b/src/renderer.ts new file mode 100644 index 0000000..c6cb44d --- /dev/null +++ b/src/renderer.ts @@ -0,0 +1,43 @@ +import { assert } from "./utils"; +import { UnicodeChar, unicodeLength } from "./unicode"; + +export class Font { + private family: string; + private size: number; + + constructor (family: string, size: number) { + this.family = family; + this.size = size; + } + + getFamily () { return this.family; } + getSize () { return this.size; } + + static defaultFont(): Font { + return new Font("Ubuntu Mono", 16); + } +} + +export type Color = string; + +// block represents a single character block on the terminal +// containing all style related data +export class Block { + private background: Color; + private foreground: Color; + private char: UnicodeChar | null; + + constructor (background: Color, foreground: Color, char?: UnicodeChar) { + assert(char == null || unicodeLength(char) == 1, `${char} is not a single character`); + + this.background = background; + this.foreground = foreground; + this.char = char; + } + + getBackground () { return this.background; } + getForeground () { return this.foreground; } + getChar () { return this.char; } +} + +export interface Renderer {} diff --git a/src/source.ts b/src/source.ts new file mode 100644 index 0000000..a3c9ab2 --- /dev/null +++ b/src/source.ts @@ -0,0 +1,38 @@ +export interface Source { + onData (handler: (string) => void); + write (data: string); +} + +export class WebSocketSource implements Source { + private ws: WebSocket; + private buffer: string; + private connected: boolean; + + constructor (host) { + this.ws = new WebSocket(host); + this.buffer = ""; + this.connected = false; + + this.ws.onopen = () => { + if (this.buffer.length) { + this.ws.send(this.buffer); + } + + this.connected = true; + }; + } + + onData (handler: (string) => void) { + this.ws.onmessage = event => { + handler(event.data); + }; + } + + write (data: string) { + if (this.connected) { + this.ws.send(data); + } else { + this.buffer += data; + } + } +} diff --git a/src/terminal.ts b/src/terminal.ts new file mode 100644 index 0000000..e0eb306 --- /dev/null +++ b/src/terminal.ts @@ -0,0 +1,148 @@ +import { parseANSISequence, ANSISequence, ANSICommand } from "./ansi"; +import { Source, WebSocketSource } from "./source"; +import { CanvasRenderer } from "./canvas"; +import { Input, KeyboardEventInput } from "./input"; + +class Terminal { + static ASCII_ESCAPE = 27; + + private source: Source; + private renderer: CanvasRenderer; + private input: Input; + + private columns: number; + private rows: number; + + private cursorColumn: number; + private cursorRow: number; + + constructor (source: Source, renderer: CanvasRenderer, input: Input) { + this.source = source; + this.renderer = renderer; + this.input = input; + + this.columns = 81; + this.rows = 24; + this.cursorColumn = 0; + this.cursorRow = 0; + + this.renderer.setGridSize(this.columns, this.rows); + this.renderer.setCursor(this.cursorColumn, this.cursorRow); + + this.source.onData(data => { + this.processData(data); + }); + + this.input.onInput(data => { + this.source.write(data); + }); + + // ESC [ 8 ; Ph ; Pw t + // signal bash to change dimension + // this.source.write(`\x1b[8;${this.columns};${this.rows}t`); + } + + updateCursor () { + this.renderer.setCursor(this.cursorColumn, this.cursorRow); + } + + carriageReturn (render = true) { + this.cursorColumn = 0; + this.cursorRow++; + + if (!this.renderer.isInRange(this.cursorColumn, this.cursorRow)) { + this.renderer.scrollDown(1, render); + this.cursorRow--; + } + + this.updateCursor(); + } + + // erase inclusively + eraseInLine (row: number, from: number, to: number) { + for (let i = from; i <= to; i++) { + this.renderer.printLetter(null, i, row); + } + } + + processData (data: string) { + // TODO: support for ANSI + const chunks = parseANSISequence(data); + + for (const chunk of chunks) { + if (chunk instanceof ANSISequence) { + switch (chunk.cmd) { + case ANSICommand.CTRL_BACKSPACE: + if (this.cursorColumn != 0) { + this.cursorColumn--; + } + + this.updateCursor(); + break; + + case ANSICommand.CTRL_TAB: + this.processData(" "); + break; + + // case ANSICommand.CTRL_CARRIAGE_RETURN: + // this.carriageReturn(); + // break; + + case ANSICommand.ESC_SET_DIMENSIONS: + const [ rows, columns ] = chunk.args; + + if (rows > 0 && columns > 0) { + this.columns = columns; + this.rows = rows; + this.renderer.setGridSize(columns, rows); + } + + break; + + case ANSICommand.ESC_ERASE_IN_LINE: + const [ code ] = chunk.args; + + if (isNaN(code) || code == 0) { + this.eraseInLine(this.cursorRow, this.cursorColumn, this.columns - 1); + } else { + console.log(`unsupported code erase in line ${code}`); + } + + break; + + default: + console.log("ignored", chunk); + } + } else { + for (const char of chunk) { + if (char == "\n") { + this.carriageReturn(false); + } else { + this.renderer.printLetter(char, this.cursorColumn, this.cursorRow); + + this.cursorColumn++; + + if (this.cursorColumn >= this.columns) { + this.carriageReturn(false); + } + } + } + } + } + + this.renderer.setCursor(this.cursorColumn, this.cursorRow); + + this.renderer.renderAll(); + } +} + +(() => { + const main = document.getElementById("main"); + const renderer = new CanvasRenderer(main); + + const source = new WebSocketSource("ws://localhost:3131"); + + const input = new KeyboardEventInput(document); + + const term = new Terminal(source, renderer, input); +})(); diff --git a/src/unicode.ts b/src/unicode.ts new file mode 100644 index 0000000..32fae09 --- /dev/null +++ b/src/unicode.ts @@ -0,0 +1,9 @@ +export function unicodeCharAt (s: string, i: number): UnicodeChar { + return [...s][i]; +} + +export function unicodeLength (s: string): number { + return [...s].length; +} + +export type UnicodeChar = string; diff --git a/src/utils.ts b/src/utils.ts new file mode 100644 index 0000000..baeeaf5 --- /dev/null +++ b/src/utils.ts @@ -0,0 +1,15 @@ +export function assert (cond: boolean, msg: string) { + if (!cond) { + throw Error(`assertion failed: ${msg}`); + } +} + +export class Pair { + public fst: A; + public snd: B; + + constructor (fst: A, snd: B) { + this.fst = fst; + this.snd = snd; + } +}