Don't bother testing tsx runtime

This reverts commit 9afeed41cd.

.gitignore

@@ -335,8 +335,13 @@ $RECYCLE.BIN/
 
 # End of https://www.toptal.com/developers/gitignore/api/jetbrains+all,vim,node,deno,macos,windows,linux
 
+# Other editors
+.nova/
+.zed/
+
 ## Misc generated files
-scroll.err
+scroll*.log
+docs
 deno.lock
 cov_profile/
 coverage/

README.md

@@ -1,16 +1,30 @@
 # Scroll
 
 Making a text editor in Typescript based on Kilo (Script + Kilo = Scroll). This
-runs on [Bun](https://bun.sh/) (v1.0 or later) and [Deno](https://deno.com/)
+runs on
-(v1.37 or later).
+
+- [Bun](https://bun.sh/) (v1.0 or later)
+- [Deno](https://deno.com/) (v1.37 or later)
+- [TSX](https://tsx.is/) - this is a Typescript wrapper using NodeJS (v20 or
+  later)
 
 To simplify running, I'm using [Just](https://github.com/casey/just).
 
 - Bun: `just bun-run [filename]`
 - Deno: `just deno-run [filename]`
+- TSX: `just tsx-run [filename]`
+
+Alternatively, there are shell scripts for each runtime in the `bin` folder. So
+you can run the editor by calling `./bin/deno.sh [filename]` without installing
+Just.
+
+Deno is generally used for dev tools, but each runtime should be functionally
+equivalent running the text editor.
 
 ## Development Notes
 
+- Implementation is based on [Kilo](https://viewsourcecode.org/snaptoken/kilo/)
+  and [Hecto](https://archive.flenker.blog/hecto/)
 - Runtime differences are adapted into a common interface
-- Runtime implementations are in the `src/deno` and `src/bun` folders
+- Runtime implementations are in the `src/deno`, `src/bun`, `src/tsx` folders
 - The main implementation is in `src/common`

bin/bun.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+set -euo pipefail
+PARENT_DIR="$(dirname "$(realpath "$0")")"
+SCROLL="$(realpath "${PARENT_DIR}/../src/scroll.ts")"
+bun run "${SCROLL}" "$@"

bin/deno.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+set -euo pipefail
+PARENT_DIR="$(dirname "$(realpath "$0")")"
+SCROLL="$(realpath "${PARENT_DIR}/../src/scroll.ts")"
+deno run --allow-all --deny-hrtime "${SCROLL}" "$@"

bin/tsx.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+set -euo pipefail
+PARENT_DIR="$(dirname "$(realpath "$0")")"
+TSX="$(realpath "${PARENT_DIR}/../node_modules/.bin/tsx")"
+SCROLL="$(realpath "${PARENT_DIR}/../src/scroll.ts")"
+"${TSX}" "${SCROLL}" "$@";

coverage.sh

@@ -4,6 +4,3 @@ deno test --allow-all --coverage=coverage
 deno coverage coverage --lcov > coverage/coverage.lcov
 genhtml -o coverage coverage/coverage.lcov
 rm coverage/*.json
-open coverage/index.html
-
-

demo/colors.ts

@@ -0,0 +1,155 @@
+/**
+ * This is a test file and a terminal color table program
+ */
+import Ansi, { AnsiColor, Ground } from '../src/common/ansi.ts';
+// ----------------------------------------------------------------------------
+// Display table of the 256 type color console escape codes
+// ----------------------------------------------------------------------------
+
+const addColor = (fore: string, back: string): string => {
+	let output = '';
+	output += fore;
+	output += back;
+
+	return output;
+};
+
+const padNum = (num: number): string =>
+	String(num).padStart(3, ' ').padEnd(5, ' ');
+
+const colorBlock = (
+	start: number,
+	end: number,
+	block: (i: number) => [string, string],
+): string => {
+	let output = '';
+
+	for (let i = start; i < end; i++) {
+		const [fg, bg] = block(i);
+
+		output += addColor(fg, bg);
+		output += padNum(i);
+		output += Ansi.ResetFormatting;
+	}
+	return output;
+};
+
+function print16colorTable(): void {
+	const drawRow = (start: number): string => {
+		let end = start + 8;
+
+		let blocks = [
+			colorBlock(
+				start,
+				end,
+				(i: number) => [Ansi.textFormat(i), Ansi.color.background.Black],
+			),
+			colorBlock(
+				start,
+				end,
+				(i: number) => [Ansi.textFormat(i), Ansi.color.background.BrightWhite],
+			),
+		];
+
+		start += 10;
+		end += 10;
+
+		blocks.push(
+			colorBlock(
+				start,
+				end,
+				(i: number) => [Ansi.color.Black, Ansi.textFormat(i)],
+			),
+		);
+		blocks.push(
+			colorBlock(
+				start,
+				end,
+				(i: number) => [Ansi.color.BrightWhite, Ansi.textFormat(i)],
+			),
+		);
+
+		return blocks.join(' '.repeat(5));
+	};
+
+	let colorTable = [
+		drawRow(30),
+		drawRow(90),
+	].join('\n');
+
+	colorTable += '\n';
+
+	console.log(colorTable);
+}
+
+function print256colorTable(): void {
+	let colorTable = '';
+	// deno-fmt-ignore
+	const breaks = [
+		7, 15,
+		21, 27, 33, 39, 45, 51, 
+		57, 63, 69, 75, 81, 87, 
+		93, 99, 105, 111, 117, 123, 
+		129, 135, 141, 147, 153, 159, 
+		165, 171, 177, 183, 189, 195, 
+		201, 207, 213, 219, 225, 231, 
+		237, 243, 249, 255,
+	];
+	const doubleBreaks = [15, 51, 87, 123, 159, 195, 231, 255];
+
+	breaks.forEach((line, n) => {
+		const start = (n > 0) ? breaks[n - 1] + 1 : 0;
+		const end = line + 1;
+
+		const blocks = [
+			colorBlock(
+				start,
+				end,
+				(
+					i: number,
+				) => [Ansi.color256(i, Ground.Fore), Ansi.color.background.Black],
+			),
+			colorBlock(
+				start,
+				end,
+				(
+					i: number,
+				) => [Ansi.color256(i, Ground.Fore), Ansi.color.background.BrightWhite],
+			),
+			colorBlock(
+				start,
+				end,
+				(i: number) => [Ansi.color.Black, Ansi.color256(i, Ground.Back)],
+			),
+			colorBlock(
+				start,
+				end,
+				(i: number) => [Ansi.color.BrightWhite, Ansi.color256(i, Ground.Back)],
+			),
+		];
+
+		colorTable += blocks.join(' '.repeat(5));
+		colorTable += '\n';
+
+		if (doubleBreaks.includes(line)) {
+			colorTable += '\n';
+		}
+	});
+
+	console.log(colorTable);
+}
+
+print16colorTable();
+print256colorTable();
+
+/**
+ * Test code for highlighting
+ */
+const decimal: number[] = [0, 117];
+const bigDecimal = 123456789123456789n;
+const octal: number[] = [0o15, 0o1];
+const bigOctal = 0o777777777777n;
+const hexadecimal: number[] = [0x1123, 0x00111];
+const bigHex = 0x123456789ABCDEFn;
+const binary: number[] = [0b11, 0b0011];
+const bigBinary = 0b11101001010101010101n;

demo/test.css

@@ -0,0 +1,271 @@
+/* -----------------------------------------------------------------------------
+	CSS loading icon
+------------------------------------------------------------------------------*/
+.cssload-loader {
+	position: relative;
+	left: calc(50% - 31px);
+	width: 62px;
+	height: 62px;
+	border-radius: 50%;
+	perspective: 780px;
+}
+
+.cssload-inner {
+	position: absolute;
+	width: 100%;
+	height: 100%;
+	box-sizing: border-box;
+	border-radius: 50%;
+}
+
+.cssload-inner.cssload-one {
+	left: 0%;
+	top: 0%;
+	animation: cssload-rotate-one 1.15s linear infinite;
+	border-bottom: 3px solid rgb(0, 0, 0);
+}
+
+.cssload-inner.cssload-two {
+	right: 0%;
+	top: 0%;
+	animation: cssload-rotate-two 1.15s linear infinite;
+	border-right: 3px solid rgb(0, 0, 0);
+}
+
+.cssload-inner.cssload-three {
+	right: 0%;
+	bottom: 0%;
+	animation: cssload-rotate-three 1.15s linear infinite;
+	border-top: 3px solid rgb(0, 0, 0);
+}
+
+@keyframes cssload-rotate-one {
+	0% {
+		transform: rotateX(35deg) rotateY(-45deg) rotateZ(0deg);
+	}
+	100% {
+		transform: rotateX(35deg) rotateY(-45deg) rotateZ(360deg);
+	}
+}
+
+@keyframes cssload-rotate-two {
+	0% {
+		transform: rotateX(50deg) rotateY(10deg) rotateZ(0deg);
+	}
+	100% {
+		transform: rotateX(50deg) rotateY(10deg) rotateZ(360deg);
+	}
+}
+
+@keyframes cssload-rotate-three {
+	0% {
+		transform: rotateX(35deg) rotateY(55deg) rotateZ(0deg);
+	}
+	100% {
+		transform: rotateX(35deg) rotateY(55deg) rotateZ(360deg);
+	}
+}
+
+/* ----------------------------------------------------------------------------
+	Loading overlay
+-----------------------------------------------------------------------------*/
+#loading-shadow {
+	position: fixed;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	background: rgba(0, 0, 0, 0.8);
+	z-index: 500;
+}
+
+#loading-shadow .loading-wrapper {
+	position: fixed;
+	z-index: 501;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+}
+
+#loading-shadow .loading-content {
+	position: relative;
+	color: #fff
+}
+
+.loading-content .cssload-inner.cssload-one,
+.loading-content .cssload-inner.cssload-two,
+.loading-content .cssload-inner.cssload-three {
+	border-color: #fff
+}
+
+/* ----------------------------------------------------------------------------
+CSS Tabs
+-----------------------------------------------------------------------------*/
+.tabs {
+	display: inline-block;
+	display: flex;
+	flex-wrap: wrap;
+	background: #efefef;
+	box-shadow: 0 48px 80px -32px rgba(0, 0, 0, 0.3);
+	margin-top: 1.5em;
+}
+
+.tabs > label {
+	border: 1px solid #e5e5e5;
+	width: 100%;
+	padding: 20px 30px;
+	background: #e5e5e5;
+	cursor: pointer;
+	font-weight: bold;
+	font-size: 18px;
+	color: #7f7f7f;
+	transition: background 0.1s, color 0.1s;
+	/* margin-left: 4em; */
+}
+
+.tabs > label:hover {
+	background: #d8d8d8;
+}
+
+.tabs > label:active {
+	background: #ccc;
+}
+
+.tabs > [type=radio]:focus + label {
+	box-shadow: inset 0px 0px 0px 3px #2aa1c0;
+	z-index: 1;
+}
+
+.tabs > [type=radio] {
+	position: absolute;
+	opacity: 0;
+}
+
+.tabs > [type=radio]:checked + label {
+	border-bottom: 1px solid #fff;
+	background: #fff;
+	color: #000;
+}
+
+.tabs > [type=radio]:checked + label + .content {
+	border: 1px solid #e5e5e5;
+	border-top: 0;
+	display: block;
+	padding: 15px;
+	background: #fff;
+	width: 100%;
+	margin: 0 auto;
+	overflow: auto;
+	/* text-align: center; */
+}
+
+.tabs .content, .single-tab {
+	display: none;
+	max-height: 950px;
+	border: 1px solid #e5e5e5;
+	border-top: 0;
+	padding: 15px;
+	background: #fff;
+	width: 100%;
+	margin: 0 auto;
+	overflow: auto;
+}
+
+.single-tab {
+	display: block;
+	border: 1px solid #e5e5e5;
+	box-shadow: 0 48px 80px -32px rgba(0, 0, 0, 0.3);
+	margin-top: 1.5em;
+}
+
+.tabs .content.full-height, .single-tab.full-height {
+	max-height: none;
+}
+
+@media (min-width: 800px) {
+	.tabs > label {
+		width: auto;
+	}
+
+	.tabs .content {
+		order: 99;
+	}
+}
+
+/* ---------------------------------------------------------------------------
+ Vertical Tabs
+ ----------------------------------------------------------------------------*/
+
+.vertical-tabs {
+	border: 1px solid #e5e5e5;
+	box-shadow: 0 48px 80px -32px rgba(0, 0, 0, 0.3);
+	margin: 0 auto;
+	position: relative;
+	width: 100%;
+}
+
+.vertical-tabs input[type="radio"] {
+	position: absolute;
+	opacity: 0;
+}
+
+.vertical-tabs .tab {
+	align-items: center;
+	display: inline-block;
+	display: flex;
+	flex-wrap: nowrap;
+}
+
+.vertical-tabs .tab label {
+	align-items: center;
+	background: #e5e5e5;
+	border: 1px solid #e5e5e5;
+	color: #7f7f7f;
+	cursor: pointer;
+	font-size: 18px;
+	font-weight: bold;
+	padding: 0 20px;
+	width: 28%;
+}
+
+.vertical-tabs .tab label:hover {
+	background: #d8d8d8;
+}
+
+.vertical-tabs .tab label:active {
+	background: #ccc;
+}
+
+.vertical-tabs .tab .content {
+	display: none;
+	border: 1px solid #e5e5e5;
+	border-left: 0;
+	border-right: 0;
+	max-height: 950px;
+	overflow: auto;
+}
+
+.vertical-tabs .tab .content.full-height {
+	max-height: none;
+}
+
+.vertical-tabs [type=radio]:checked + label {
+	border: 0;
+	background: #fff;
+	color: #000;
+	width: 38%;
+}
+
+.vertical-tabs [type=radio]:focus + label {
+	box-shadow: inset 0px 0px 0px 3px #2aa1c0;
+	z-index: 1;
+}
+
+.vertical-tabs [type=radio]:checked ~ .content {
+	display: block;
+}
+

deno.jsonc

@@ -13,5 +13,6 @@
 		"semiColons": true,
 		"singleQuote": true
 	},
-	"nodeModulesDir": true
+	"nodeModulesDir": true,
+	"exclude": ["src/bun/"]
 }

justfile

@@ -3,31 +3,41 @@ default:
 	@just --list
 
 # Test coverage
-coverage: bun-test deno-coverage
+coverage: deno-coverage bun-coverage
+
+# Generate test coverage and open report in default browser
+open-coverage: coverage
+	open coverage/index.html
 
 # Typescript checking
 check: deno-check bun-check
 
+# Generate source docs
 docs:
-	deno doc --html --unstable-ffi --name="Scroll" ./src/scroll.ts ./src/common/mod.ts ./src/deno/mod.ts ./src/bun/mod.ts
+	deno doc --html --name="Scroll" ./src/common/*.ts ./src/common/**/*.ts
+
+# Generate source docs and open in default browser
+open-docs: docs
+	open docs/all_symbols.html
 
 # Reformat the code
 fmt:
 	deno fmt
 
 # Run tests with all the runtimes
-test: deno-test bun-test
+test: deno-test tsx-test bun-test
 
 # Run all code-quality related tasks
 quality: check test
 
 # Clean up any generated files
 clean:
+	rm -f test.file
 	rm -rf .deno-cover
 	rm -rf coverage
 	rm -rf docs
-	rm -f scroll.log
+	rm -f scroll*.log
-	rm -f scroll.err
+	rm -f test.file
 	rm -f tsconfig.tsbuildinfo
 
 ##########################################################################################
@@ -36,15 +46,19 @@ clean:
 
 # Check code with actual Typescript compiler
 bun-check:
-	bunx tsc
+	bun run bun-check
 
 # Test with bun
 bun-test:
-	bun test --coverage
+	bun run bun-test
+	
+# CLI test coverage report
+bun-coverage:
+	bun run bun-coverage
 
 # Run with bun
 bun-run file="":
-	bun run ./src/scroll.ts {{file}}
+	bun run bun-run {{file}}
 
 ##########################################################################################
 # Deno-specific commands
@@ -52,17 +66,35 @@ bun-run file="":
 
 # Lint code and check types
 deno-check:
-	deno lint
+	deno task deno-lint
-	deno check --unstable-ffi  --all -c deno.jsonc ./src/deno/*.ts ./src/common/*.ts
+	deno task deno-check
 
 # Test with deno
 deno-test:
-	deno test --allow-all --unstable-ffi
+	deno task deno-test
 
 # Create test coverage report with deno
 deno-coverage:
-	./coverage.sh
+	deno task deno-coverage
 
 # Run with deno
 deno-run file="":
-	deno run --allow-all --allow-ffi --deny-hrtime --unstable-ffi ./src/scroll.ts {{file}}
+	deno task deno-run {{file}}
+
+##########################################################################################
+# tsx(Node JS)-specific commands
+##########################################################################################
+
+# Check code with actual Typescript compiler
+tsx-check:
+	npm run tsx-check
+
+# Test with tsx (NodeJS)
+tsx-test:
+	npm run tsx-test
+
+# Run with tsx (NodeJS)
+tsx-run file="":
+	npm run tsx-run {{file}}
+	
+

package.json

@@ -1,6 +1,24 @@
 {
 	"dependencies": {},
 	"devDependencies": {
-		"bun-types": "^1.0.11"
+		"@types/node": "*",
-	}
+		"bun-types": "*",
+		"typescript": "^5.5",
+		"tsx": "*"
+	},
+	"scripts": {
+		"bun-check": "bunx tsc",
+		"bun-coverage": "bun test --coverage",
+		"bun-run": "bun run ./src/scroll.ts",
+		"bun-test": "bun test",
+		"deno-lint": "deno lint",
+		"deno-check": "deno check  --all -c deno.jsonc ./src/deno/*.ts ./src/common/*.ts ./src/tsx/*.ts",
+		"deno-coverage": "./coverage.sh",
+		"deno-run": "deno run --allow-all --deny-hrtime ./src/scroll.ts",
+		"deno-test": "deno test --allow-all",
+		"tsx-check": "npx tsc",
+		"tsx-run": "tsx ./src/scroll.ts",
+		"tsx-test": "tsx --test './src/common/all_test.ts'"
+	},
+	"type": "module"
 }

src/bun/file_io.ts

@@ -1,20 +0,0 @@
-if (!('Bun' in globalThis)) throw new Error('This module requires Bun');
-
-import { IFileIO } from '../common/runtime.ts';
-import { appendFile } from 'node:fs/promises';
-
-const BunFileIO: IFileIO = {
-	openFile: async (path: string): Promise<string> => {
-		const file = await globalThis.Bun.file(path);
-		return await file.text();
-	},
-	appendFile: async function (path: string, contents: string): Promise<void> {
-		return await appendFile(path, contents);
-	},
-	saveFile: async function (path: string, contents: string): Promise<void> {
-		await globalThis.Bun.write(path, contents);
-		return;
-	},
-};
-
-export default BunFileIO;

src/bun/mod.ts

@@ -1,25 +1,14 @@
-if (!('Bun' in globalThis)) throw new Error('This module requires Bun');
 /**
  * The main entrypoint when using Bun as the runtime
  */
+import { CommonRuntime, IRuntime, RunTimeType } from '../common/runtime.ts';
 
-import { IRuntime, RunTimeType } from '../common/runtime.ts';
+/**
-import BunTerminalIO from './terminal_io.ts';
+ * The Bun Runtime implementation
-import BunFileIO from './file_io.ts';
+ */
-
-import * as process from 'node:process';
-
 const BunRuntime: IRuntime = {
+	...CommonRuntime,
 	name: RunTimeType.Bun,
-	file: BunFileIO,
-	term: BunTerminalIO,
-	onEvent: (eventName: string, handler) => process.on(eventName, handler),
-	onExit: (cb: () => void): void => {
-		process.on('beforeExit', cb);
-		process.on('exit', cb);
-		process.on('SIGINT', cb);
-	},
-	exit: (code?: number) => process.exit(code),
 };
 
 export default BunRuntime;

src/bun/terminal_io.ts

@@ -1,90 +0,0 @@
-if (!('Bun' in globalThis)) throw new Error('This module requires Bun');
-/**
- * Wrap the runtime-specific hook into stdin
- */
-import process from 'node:process';
-import Ansi from '../common/ansi.ts';
-import { defaultTerminalSize } from '../common/config.ts';
-import { readKey } from '../common/fns.ts';
-import { ITerminal, ITerminalSize } from '../common/types.ts';
-
-const encoder = new TextEncoder();
-
-async function _getTerminalSizeFromAnsi(): Promise<ITerminalSize> {
-	// Tell the cursor to move to Row 999 and Column 999
-	// Since this command specifically doesn't go off the screen
-	// When we ask where the cursor is, we should get the size of the screen
-	await BunTerminalIO.writeStdout(
-		Ansi.moveCursorForward(999) + Ansi.moveCursorDown(999),
-	);
-
-	// Ask where the cursor is
-	await BunTerminalIO.writeStdout(Ansi.GetCursorLocation);
-
-	// Get the first chunk from stdin
-	// The response is \x1b[(rows);(cols)R..
-	const chunk = await BunTerminalIO.readStdinRaw();
-	if (chunk === null) {
-		return defaultTerminalSize;
-	}
-
-	const rawCode = (new TextDecoder()).decode(chunk);
-	const res = rawCode.trim().replace(/^.\[([0-9]+;[0-9]+)R$/, '$1');
-	const [srows, scols] = res.split(';');
-	const rows = parseInt(srows, 10) ?? 24;
-	const cols = parseInt(scols, 10) ?? 80;
-
-	// Clear the screen
-	await BunTerminalIO.writeStdout(Ansi.ClearScreen + Ansi.ResetCursor);
-
-	return {
-		rows,
-		cols,
-	};
-}
-
-const BunTerminalIO: ITerminal = {
-	// Deno only returns arguments passed to the script, so
-	// remove the bun runtime executable, and entry script arguments
-	// to have consistent argument lists
-	argv: (Bun.argv.length > 2) ? Bun.argv.slice(2) : [],
-	inputLoop: async function* inputLoop() {
-		// for await (const chunk of Bun.stdin.stream()) {
-		// 	yield chunk;
-		// }
-		//
-		// return null;
-		for await (const chunk of process.stdin) {
-			yield encoder.encode(chunk);
-		}
-
-		return null;
-	},
-	/**
-	 * Get the size of the terminal window via ANSI codes
-	 * @see https://viewsourcecode.org/snaptoken/kilo/03.rawInputAndOutput.html#window-size-the-hard-way
-	 */
-	getTerminalSize: function getTerminalSize(): Promise<ITerminalSize> {
-		const [cols, rows] = process.stdout.getWindowSize();
-
-		return Promise.resolve({
-			rows,
-			cols,
-		});
-	},
-	readStdin: async function (): Promise<string | null> {
-		const raw = await BunTerminalIO.readStdinRaw();
-		return readKey(raw ?? new Uint8Array(0));
-	},
-	readStdinRaw: async function (): Promise<Uint8Array | null> {
-		const chunk = await BunTerminalIO.inputLoop().next();
-		return chunk.value ?? null;
-	},
-	writeStdout: async function write(s: string): Promise<void> {
-		const buffer = encoder.encode(s);
-
-		await Bun.write(Bun.stdout, buffer);
-	},
-};
-
-export default BunTerminalIO;

src/bun/test_base.ts

@@ -1,35 +1,19 @@
-if (!('Bun' in globalThis)) throw new Error('This module requires Bun');
 /**
  * Adapt the bun test interface to the shared testing interface
  */
-import { describe, expect, test } from 'bun:test';
+import { describe, test } from 'bun:test';
-import { ITestBase } from '../common/types.ts';
+import AbstractTestBase from '../common/runtime/test_base.ts';
-
+class BunTestBase extends AbstractTestBase {
-export function testSuite(testObj: any) {
+	public static testSuite(testObj: any): void {
-	Object.keys(testObj).forEach((group) => {
+		Object.keys(testObj).forEach((group) => {
-		describe(group, () => {
+			describe(group, () => {
-			const groupObj = testObj[group];
+				const groupObj = testObj[group];
-			Object.keys(groupObj).forEach((testName) => {
+				Object.keys(groupObj).forEach((testName) => {
-				test(testName, groupObj[testName]);
+					test(testName, groupObj[testName]);
+				});
 			});
 		});
-	});
+	}
 }
 
-const BunTestBase: ITestBase = {
-	assertEquals: (actual: unknown, expected: unknown) =>
-		expect(actual).toEqual(expected),
-	assertExists: (actual: unknown) => expect(actual).toBeDefined(),
-	assertFalse: (actual: boolean) => expect(actual).toBe(false),
-	assertInstanceOf: (actual: unknown, expectedType: any) =>
-		expect(actual).toBeInstanceOf(expectedType),
-	assertNotEquals: (actual: unknown, expected: unknown) =>
-		expect(actual).not.toBe(expected),
-	assertNull: (actual: unknown) => expect(actual).toBeNull(),
-	assertStrictEquals: (actual: unknown, expected: unknown) =>
-		expect(actual).toBe(expected),
-	assertTrue: (actual: boolean) => expect(actual).toBe(true),
-	testSuite,
-};
-
 export default BunTestBase;

src/common/all_test.ts

@@ -2,270 +2,41 @@ import Ansi, * as _Ansi from './ansi.ts';
 import Buffer from './buffer.ts';
 import Document from './document.ts';
 import Editor from './editor.ts';
+import { FileLang } from './filetype.ts';
+import Option, { None, Some } from './option.ts';
 import Position from './position.ts';
 import Row from './row.ts';
 
+import FileType, * as FT from './filetype.ts';
 import * as Fn from './fns.ts';
 import { defaultTerminalSize, SCROLL_TAB_SIZE } from './config.ts';
 import { getTestRunner } from './runtime.ts';
+import { HighlightType, SearchDirection } from './types.ts';
+
+import fs from 'node:fs';
 
 const {
 	assertEquals,
+	assertEquivalent,
 	assertExists,
 	assertInstanceOf,
 	assertNotEquals,
-	assertNull,
 	assertFalse,
 	assertTrue,
+	assertSome,
+	assertNone,
 	testSuite,
 } = await getTestRunner();
 
-// ----------------------------------------------------------------------------
+const THIS_FILE = './src/common/all_test.ts';
-
+const KILO_FILE = './demo/kilo.c';
-const ANSITest = () => {
-	const { AnsiColor, Ground } = _Ansi;
-
-	return {
-		'color()': () => {
-			assertEquals(Ansi.color(AnsiColor.FgBlue), '\x1b[34m');
-		},
-		'color256()': () => {
-			assertEquals(Ansi.color256(128, Ground.Back), '\x1b[48;5;128m');
-			assertEquals(Ansi.color256(128, Ground.Fore), '\x1b[38;5;128m');
-		},
-		'rgb()': () => {
-			assertEquals(Ansi.rgb(32, 64, 128, Ground.Back), '\x1b[48;2;32;64;128m');
-			assertEquals(Ansi.rgb(32, 64, 128, Ground.Fore), '\x1b[38;2;32;64;128m');
-		},
-		'moveCursor()': () => {
-			assertEquals(Ansi.moveCursor(1, 2), '\x1b[2;3H');
-		},
-		'moveCursorForward()': () => {
-			assertEquals(Ansi.moveCursorForward(2), '\x1b[2C');
-		},
-		'moveCursorDown()': () => {
-			assertEquals(Ansi.moveCursorDown(7), '\x1b[7B');
-		},
-	};
-};
 
 // ----------------------------------------------------------------------------
-
+// Helper Function Tests
-const BufferTest = {
-	'new Buffer': () => {
-		const b = new Buffer();
-		assertInstanceOf(b, Buffer);
-		assertEquals(b.strlen(), 0);
-	},
-	'.appendLine': () => {
-		const b = new Buffer();
-
-		// Carriage return and line feed
-		b.appendLine();
-		assertEquals(b.strlen(), 2);
-
-		b.clear();
-		assertEquals(b.strlen(), 0);
-
-		b.appendLine('foo');
-		assertEquals(b.strlen(), 5);
-	},
-	'.append': () => {
-		const b = new Buffer();
-
-		b.append('foobar');
-		assertEquals(b.strlen(), 6);
-		b.clear();
-
-		b.append('foobar', 3);
-		assertEquals(b.strlen(), 3);
-	},
-	'.flush': async () => {
-		const b = new Buffer();
-		b.appendLine('foobarbaz' + Ansi.ClearLine);
-		assertEquals(b.strlen(), 14);
-
-		await b.flush();
-
-		assertEquals(b.strlen(), 0);
-	},
-};
-
-// ----------------------------------------------------------------------------
-
-const DocumentTest = {
-	'.default': () => {
-		const doc = Document.default();
-		assertEquals(doc.numRows, 0);
-		assertTrue(doc.isEmpty());
-		assertEquals(doc.row(0), null);
-	},
-	'.insertRow': () => {
-		const doc = Document.default();
-		doc.insertRow(undefined, 'foobar');
-		assertEquals(doc.numRows, 1);
-		assertFalse(doc.isEmpty());
-		assertInstanceOf(doc.row(0), Row);
-	},
-	'.insert': () => {
-		const doc = Document.default();
-		assertFalse(doc.dirty);
-		doc.insert(Position.at(0, 0), 'foobar');
-		assertEquals(doc.numRows, 1);
-		assertTrue(doc.dirty);
-
-		doc.insert(Position.at(2, 0), 'baz');
-		assertEquals(doc.numRows, 1);
-		assertTrue(doc.dirty);
-
-		doc.insert(Position.at(9, 0), 'buzz');
-		assertEquals(doc.numRows, 1);
-		assertTrue(doc.dirty);
-		const row0 = doc.row(0);
-		assertEquals(row0?.toString(), 'foobazbarbuzz');
-		assertEquals(row0?.rstring(), 'foobazbarbuzz');
-		assertEquals(row0?.rsize, 13);
-
-		doc.insert(Position.at(0, 1), 'Lorem Ipsum');
-		assertEquals(doc.numRows, 2);
-		assertTrue(doc.dirty);
-	},
-	'.delete': () => {
-		const doc = Document.default();
-		doc.insert(Position.default(), 'foobar');
-		doc.delete(Position.at(3, 0));
-		assertEquals(doc.row(0)?.toString(), 'fooar');
-	},
-};
-
-// ----------------------------------------------------------------------------
-
-const EditorTest = {
-	'new Editor': () => {
-		const e = new Editor(defaultTerminalSize);
-		assertInstanceOf(e, Editor);
-	},
-};
-
-// ----------------------------------------------------------------------------
-
-const PositionTest = {
-	'.default': () => {
-		const p = Position.default();
-		assertEquals(p.x, 0);
-		assertEquals(p.y, 0);
-	},
-	'.at': () => {
-		const p = Position.at(5, 7);
-		assertEquals(p.x, 5);
-		assertEquals(p.y, 7);
-	},
-	'.from': () => {
-		const p1 = Position.at(1, 2);
-		const p2 = Position.from(p1);
-
-		p1.x = 2;
-		p1.y = 4;
-
-		assertEquals(p1.x, 2);
-		assertEquals(p1.y, 4);
-
-		assertEquals(p2.x, 1);
-		assertEquals(p2.y, 2);
-	},
-};
-
-// ----------------------------------------------------------------------------
-
-const RowTest = {
-	'.default': () => {
-		const row = Row.default();
-		assertEquals(row.toString(), '');
-	},
-	'.from': () => {
-		// From string
-		const row = Row.from('xyz');
-		assertEquals(row.toString(), 'xyz');
-
-		// From existing Row
-		assertEquals(Row.from(row).toString(), row.toString());
-
-		// From 'chars'
-		assertEquals(Row.from(['😺', '😸', '😹']).toString(), '😺😸😹');
-	},
-	'.append': () => {
-		const row = Row.from('foo');
-		row.append('bar');
-		assertEquals(row.toString(), 'foobar');
-	},
-	'.delete': () => {
-		const row = Row.from('foof');
-		row.delete(3);
-		assertEquals(row.toString(), 'foo');
-
-		row.delete(4);
-		assertEquals(row.toString(), 'foo');
-	},
-	'.split': () => {
-		// When you split a row, it's from the cursor position
-		// (Kind of like if the string were one-indexed)
-		const row = Row.from('foobar');
-		const row2 = Row.from('bar');
-		assertEquals(row.split(3).toString(), row2.toString());
-	},
-	'.find': () => {
-		const normalRow = Row.from('For whom the bell tolls');
-		assertEquals(normalRow.find('who'), 4);
-		assertNull(normalRow.find('foo'));
-
-		const emojiRow = Row.from('😺😸😹');
-		assertEquals(emojiRow.find('😹'), 2);
-		assertNull(emojiRow.find('🤰🏼'));
-	},
-	'.byteIndexToCharIndex': () => {
-		// Each 'character' is two bytes
-		const row = Row.from('😺😸😹👨‍👩‍👧‍👦');
-		assertEquals(row.byteIndexToCharIndex(4), 2);
-		assertEquals(row.byteIndexToCharIndex(2), 1);
-		assertEquals(row.byteIndexToCharIndex(0), 0);
-
-		// Return count on nonsense index
-		assertEquals(Fn.strlen(row.toString()), 10);
-		assertEquals(row.byteIndexToCharIndex(72), 10);
-
-		const row2 = Row.from('foobar');
-		assertEquals(row2.byteIndexToCharIndex(2), 2);
-	},
-	'.charIndexToByteIndex': () => {
-		// Each 'character' is two bytes
-		const row = Row.from('😺😸😹👨‍👩‍👧‍👦');
-		assertEquals(row.charIndexToByteIndex(2), 4);
-		assertEquals(row.charIndexToByteIndex(1), 2);
-		assertEquals(row.charIndexToByteIndex(0), 0);
-	},
-	'.cxToRx, .rxToCx': () => {
-		const row = Row.from('foo\tbar\tbaz');
-		row.update();
-		assertNotEquals(row.chars, row.rchars);
-		assertNotEquals(row.size, row.rsize);
-		assertEquals(row.size, 11);
-		assertEquals(row.rsize, row.size + (SCROLL_TAB_SIZE * 2) - 2);
-
-		const cx = 11;
-		const aRx = row.cxToRx(cx);
-		const rx = 11;
-		const aCx = row.rxToCx(aRx);
-		assertEquals(aCx, cx);
-		assertEquals(aRx, rx);
-	},
-};
-
 // ----------------------------------------------------------------------------
 
 const fnTest = () => {
 	const {
-		some,
-		none,
 		arrayInsert,
 		noop,
 		posSub,
@@ -279,47 +50,49 @@ const fnTest = () => {
 		isAsciiDigit,
 		strlen,
 		truncate,
+		highlightToColor,
 	} = Fn;
 
 	return {
-		'some()': () => {
-			assertFalse(some(null));
-			assertFalse(some(void 0));
-			assertFalse(some(undefined));
-			assertTrue(some(0));
-			assertTrue(some(false));
-		},
-		'none()': () => {
-			assertTrue(none(null));
-			assertTrue(none(void 0));
-			assertTrue(none(undefined));
-			assertFalse(none(0));
-			assertFalse(none(false));
-		},
 		'arrayInsert() strings': () => {
 			const a = ['😺', '😸', '😹'];
 			const b = arrayInsert(a, 1, 'x');
 			const c = ['😺', 'x', '😸', '😹'];
-			assertEquals(b, c);
+			assertEquivalent(b, c);
 
 			const d = arrayInsert(c, 17, 'y');
 			const e = ['😺', 'x', '😸', '😹', 'y'];
-			assertEquals(d, e);
+			assertEquivalent(d, e);
 
-			assertEquals(arrayInsert([], 0, 'foo'), ['foo']);
+			assertEquivalent(arrayInsert([], 0, 'foo'), ['foo']);
 		},
 		'arrayInsert() numbers': () => {
 			const a = [1, 3, 5];
 			const b = [1, 3, 4, 5];
-			assertEquals(arrayInsert(a, 2, 4), b);
+			assertEquivalent(arrayInsert(a, 2, 4), b);
 
 			const c = [1, 2, 3, 4, 5];
-			assertEquals(arrayInsert(b, 1, 2), c);
+			assertEquivalent(arrayInsert(b, 1, 2), c);
 		},
 		'noop fn': () => {
 			assertExists(noop);
 			assertEquals(noop(), undefined);
 		},
+		'highlightToColor()': () => {
+			[
+				HighlightType.Number,
+				HighlightType.Match,
+				HighlightType.String,
+				HighlightType.SingleLineComment,
+				HighlightType.MultiLineComment,
+				HighlightType.Keyword1,
+				HighlightType.Keyword2,
+				HighlightType.Operator,
+				HighlightType.None,
+			].forEach((type) => {
+				assertTrue(highlightToColor(type).length > 0);
+			});
+		},
 		'posSub()': () => {
 			assertEquals(posSub(14, 15), 0);
 			assertEquals(posSub(15, 1), 14);
@@ -340,7 +113,7 @@ const fnTest = () => {
 			assertEquals(ord('a'), 97);
 		},
 		'strChars() properly splits strings into unicode characters': () => {
-			assertEquals(strChars('😺😸😹'), ['😺', '😸', '😹']);
+			assertEquivalent(strChars('😺😸😹'), ['😺', '😸', '😹']);
 		},
 		'ctrlKey()': () => {
 			const ctrl_a = ctrlKey('a');
@@ -391,8 +164,6 @@ const fnTest = () => {
 	};
 };
 
-// ----------------------------------------------------------------------------
-
 const readKeyTest = () => {
 	const { KeyCommand } = _Ansi;
 	const { readKey, ctrlKey } = Fn;
@@ -445,17 +216,502 @@ const readKeyTest = () => {
 	};
 };
 
+// ----------------------------------------------------------------------------
+// Tests by module
+// ----------------------------------------------------------------------------
+
+const ANSITest = () => {
+	const { Ground } = _Ansi;
+
+	return {
+		'color()': () => {
+			assertEquals(Ansi.color.Blue, '\x1b[34m');
+		},
+		'color256()': () => {
+			assertEquals(Ansi.color256(128, Ground.Back), '\x1b[48;5;128m');
+			assertEquals(Ansi.color256(128, Ground.Fore), '\x1b[38;5;128m');
+		},
+		'rgb()': () => {
+			assertEquals(Ansi.rgb(32, 64, 128, Ground.Back), '\x1b[48;2;32;64;128m');
+			assertEquals(Ansi.rgb(32, 64, 128, Ground.Fore), '\x1b[38;2;32;64;128m');
+		},
+		'moveCursor()': () => {
+			assertEquals(Ansi.moveCursor(1, 2), '\x1b[2;3H');
+		},
+		'moveCursorForward()': () => {
+			assertEquals(Ansi.moveCursorForward(2), '\x1b[2C');
+		},
+		'moveCursorDown()': () => {
+			assertEquals(Ansi.moveCursorDown(7), '\x1b[7B');
+		},
+	};
+};
+
+// ----------------------------------------------------------------------------
+
+const BufferTest = {
+	'new Buffer': () => {
+		const b = Buffer.default();
+		assertInstanceOf(b, Buffer);
+		assertEquals(b.strlen(), 0);
+	},
+	'.appendLine': () => {
+		const b = Buffer.default();
+
+		// Carriage return and line feed
+		b.appendLine();
+		assertEquals(b.strlen(), 2);
+
+		b.clear();
+		assertEquals(b.strlen(), 0);
+
+		b.appendLine('foo');
+		assertEquals(b.strlen(), 5);
+	},
+	'.append': () => {
+		const b = Buffer.default();
+
+		b.append('foobar');
+		assertEquals(b.strlen(), 6);
+		b.clear();
+
+		b.append('foobar', 3);
+		assertEquals(b.strlen(), 3);
+	},
+	'.flush': async () => {
+		const b = Buffer.default();
+		b.appendLine('foobarbaz' + Ansi.ClearLine);
+		assertEquals(b.strlen(), 14);
+
+		await b.flush();
+
+		assertEquals(b.strlen(), 0);
+	},
+};
+
+// ----------------------------------------------------------------------------
+
+const DocumentTest = {
+	'.default': () => {
+		const doc = Document.default();
+		assertEquals(doc.numRows, 0);
+		assertTrue(doc.isEmpty());
+		assertEquivalent(doc.row(0), None);
+	},
+	'.open': async () => {
+		const oldDoc = Document.default();
+		oldDoc.insert(Position.default(), 'foobarbaz');
+		assertTrue(oldDoc.dirty);
+		assertEquals(oldDoc.numRows, 1);
+
+		const doc = await oldDoc.open(THIS_FILE);
+		assertEquals(FileLang.TypeScript, doc.fileType);
+		assertFalse(doc.dirty);
+		assertFalse(doc.isEmpty());
+		assertTrue(doc.numRows > 1);
+	},
+	'.save': async () => {
+		const doc = await Document.default().open(THIS_FILE);
+		doc.insertNewline(Position.default());
+		assertTrue(doc.dirty);
+
+		await doc.save('test.file');
+
+		fs.rm('test.file', (err: any) => {
+			assertNone(Option.from(err));
+		});
+
+		assertFalse(doc.dirty);
+	},
+	'.find': async () => {
+		const doc = await Document.default().open(KILO_FILE);
+
+		// First search forward from the beginning of the file
+		const query1 = doc.find(
+			'editor',
+			Position.default(),
+			SearchDirection.Forward,
+		);
+		assertTrue(query1.isSome());
+		const pos1 = query1.unwrap();
+		assertEquivalent(pos1, Position.at(5, 27));
+
+		// Now search backwards from line 400
+		const query2 = doc.find(
+			'realloc',
+			Position.at(44, 400),
+			SearchDirection.Backward,
+		);
+		assertTrue(query2.isSome());
+		const pos2 = query2.unwrap();
+		assertEquivalent(pos2, Position.at(11, 330));
+
+		// And backwards again
+		const query3 = doc.find(
+			'editor',
+			Position.from(pos2),
+			SearchDirection.Backward,
+		);
+		assertTrue(query3.isSome());
+		const pos3 = query3.unwrap();
+		assertEquivalent(pos3, Position.at(5, 328));
+	},
+	'.find - empty result': () => {
+		const doc = Document.default();
+		doc.insertNewline(Position.default());
+
+		const query = doc.find('foo', Position.default(), SearchDirection.Forward);
+		assertNone(query);
+
+		const query2 = doc.find('bar', Position.at(0, 5), SearchDirection.Forward);
+		assertNone(query2);
+	},
+	'.insert': () => {
+		const doc = Document.default();
+		assertFalse(doc.dirty);
+		doc.insert(Position.at(0, 0), 'foobar');
+		assertEquals(doc.numRows, 1);
+		assertTrue(doc.dirty);
+
+		doc.insert(Position.at(2, 0), 'baz');
+		assertEquals(doc.numRows, 1);
+		assertTrue(doc.dirty);
+
+		doc.insert(Position.at(9, 0), 'buzz');
+		assertEquals(doc.numRows, 1);
+		assertTrue(doc.dirty);
+
+		// Update row
+		doc.highlight(None, None);
+
+		const row0 = doc.row(0).unwrap();
+		assertEquals(row0.toString(), 'foobazbarbuzz');
+		assertEquals(row0.rstring(), 'foobazbarbuzz');
+		assertEquals(row0.rsize, 13);
+
+		doc.insert(Position.at(0, 1), 'Lorem Ipsum');
+		assertEquals(doc.numRows, 2);
+		assertTrue(doc.dirty);
+	},
+	'.insertNewline': () => {
+		// Invalid insert location
+		const doc = Document.default();
+		doc.insertNewline(Position.at(0, 3));
+		assertFalse(doc.dirty);
+		assertTrue(doc.isEmpty());
+
+		// Add new empty row
+		const doc2 = Document.default();
+		doc2.insertNewline(Position.default());
+		assertTrue(doc2.dirty);
+		assertFalse(doc2.isEmpty());
+
+		// Split an existing line
+		const doc3 = Document.default();
+		doc3.insert(Position.default(), 'foobar');
+		doc3.insertNewline(Position.at(3, 0));
+		assertEquals(doc3.numRows, 2);
+		assertEquals(doc3.row(0).unwrap().toString(), 'foo');
+		assertEquals(doc3.row(1).unwrap().toString(), 'bar');
+	},
+	'.delete': () => {
+		const doc = Document.default();
+		doc.insert(Position.default(), 'foobar');
+		doc.delete(Position.at(3, 0));
+		assertEquals(doc.row(0).unwrap().toString(), 'fooar');
+
+		// Merge next row
+		const doc2 = Document.default();
+		doc2.insertNewline(Position.default());
+		doc2.insert(Position.at(0, 1), 'foobar');
+		doc2.delete(Position.at(0, 0));
+		assertEquals(doc2.row(0).unwrap().toString(), 'foobar');
+
+		// Invalid delete location
+		const doc3 = Document.default();
+		doc3.insert(Position.default(), 'foobar');
+		doc3.delete(Position.at(0, 3));
+		assertEquals(doc3.row(0).unwrap().toString(), 'foobar');
+	},
+};
+
+// ----------------------------------------------------------------------------
+
+const EditorTest = {
+	'new Editor': () => {
+		const e = Editor.create(defaultTerminalSize);
+		assertInstanceOf(e, Editor);
+	},
+	'.open': async () => {
+		const e = Editor.create(defaultTerminalSize);
+		await e.open(THIS_FILE);
+		assertInstanceOf(e, Editor);
+	},
+	'.processKeyPress - letters': async () => {
+		const e = Editor.create(defaultTerminalSize);
+		const res = await e.processKeyPress('a');
+		assertTrue(res);
+	},
+	'.processKeyPress - ctrl-q': async () => {
+		// Dirty file (Need to clear confirmation messages)
+		const e = Editor.create(defaultTerminalSize);
+		await e.processKeyPress('d');
+		assertTrue(await e.processKeyPress(Fn.ctrlKey('q')));
+		assertTrue(await e.processKeyPress(Fn.ctrlKey('q')));
+		assertTrue(await e.processKeyPress(Fn.ctrlKey('q')));
+		assertFalse(await e.processKeyPress(Fn.ctrlKey('q')));
+
+		// Clean file
+		const e2 = Editor.create(defaultTerminalSize);
+		const res = await e2.processKeyPress(Fn.ctrlKey('q'));
+		assertFalse(res);
+	},
+};
+
+// ----------------------------------------------------------------------------
+
+const FileTypeTest = {
+	'FileType.from()': () => {
+		for (const [ext, typeClass] of FT.fileTypeMap.entries()) {
+			const file = `test${ext}`;
+			const syntax = FileType.from(file);
+
+			assertInstanceOf(syntax, typeClass);
+		}
+	},
+};
+
+// ----------------------------------------------------------------------------
+
+const OptionTest = {
+	'Option.from()': () => {
+		assertNone(Option.from(null));
+		assertNone(Option.from());
+		assertEquivalent(Option.from(undefined), None);
+
+		assertSome(Option.from('foo'));
+		assertSome(Option.from(234));
+		assertSome(Option.from({}));
+		assertSome(Some([1, 2, 3]));
+
+		assertEquivalent(Option.from(Some('foo')), Some('foo'));
+		assertEquivalent(Some(Some('bar')), Some('bar'));
+	},
+	'.isSome': () => {
+		assertFalse(None.isSome());
+		assertTrue(Option.from('foo').isSome());
+		assertTrue(Some('foo').isSome());
+	},
+	'.isNone': () => {
+		assertTrue(None.isNone());
+		assertFalse(Option.from('foo').isNone());
+		assertFalse(Some('foo').isNone());
+	},
+	'.toString': () => {
+		assertEquals(Some({}).toString(), 'Some ({})');
+		assertEquals(Some([1, 2, 3]).toString(), 'Some ([1,2,3])');
+		assertEquals(None.toString(), 'None');
+	},
+	'.isSomeAnd': () => {
+		assertFalse(Option.from().isSomeAnd((_a) => true));
+		assertTrue(Option.from('foo').isSomeAnd((a) => typeof a === 'string'));
+	},
+	'.isNoneAnd': () => {
+		assertTrue(None.isNoneAnd(() => true));
+		assertFalse(None.isNoneAnd(() => false));
+		assertFalse(Some('x').isNoneAnd(() => true));
+	},
+	'.map': () => {
+		const fn = (_a: any) => 'bar';
+
+		assertEquivalent(Some('bar'), Some('foo').map(fn));
+		assertNone(None.map(fn));
+	},
+	'.mapOr': () => {
+		const fn = (_a: any) => 'bar';
+
+		assertEquals('bar', Some('foo').mapOr('baz', fn));
+		assertEquals('baz', None.mapOr('baz', fn));
+	},
+	'.mapOrElse': () => {
+		const fn = (_a: any) => 'bar';
+		const defFn = () => 'baz';
+
+		assertEquals('bar', Some('foo').mapOrElse(defFn, fn));
+		assertEquals('baz', None.mapOrElse(defFn, fn));
+	},
+	'.unwrapOr': () => {
+		assertEquals('foo', Some('foo').unwrapOr('bar'));
+		assertEquals('bar', None.unwrapOr('bar'));
+	},
+	'.unwrapOrElse': () => {
+		const fn = () => 'bar';
+		assertEquals('foo', Some('foo').unwrapOrElse(fn));
+		assertEquals('bar', None.unwrapOrElse(fn));
+	},
+	'.and': () => {
+		const optb = Some('bar');
+		assertEquivalent(optb, Some('foo').and(optb));
+		assertEquivalent(None, None.and(optb));
+	},
+	'.andThen': () => {
+		const fn = (x: any) => Some(typeof x === 'string');
+		assertEquivalent(Some(true), Some('foo').andThen(fn));
+		assertNone(None.andThen(fn));
+	},
+	'.or': () => {
+		const optb = Some('bar');
+		assertEquivalent(Some('foo'), Some('foo').or(optb));
+		assertEquivalent(optb, None.or(optb));
+	},
+	'.orElse': () => {
+		const fn = () => Some('bar');
+		assertEquivalent(Some('foo'), Some('foo').orElse(fn));
+		assertEquivalent(Some('bar'), None.orElse(fn));
+	},
+};
+
+// ----------------------------------------------------------------------------
+
+const PositionTest = {
+	'.default': () => {
+		const p = Position.default();
+		assertEquals(p.x, 0);
+		assertEquals(p.y, 0);
+	},
+	'.at': () => {
+		const p = Position.at(5, 7);
+		assertEquals(p.x, 5);
+		assertEquals(p.y, 7);
+	},
+	'.from': () => {
+		const p1 = Position.at(1, 2);
+		const p2 = Position.from(p1);
+
+		p1.x = 2;
+		p1.y = 4;
+
+		assertEquals(p1.x, 2);
+		assertEquals(p1.y, 4);
+
+		assertEquals(p2.x, 1);
+		assertEquals(p2.y, 2);
+	},
+};
+
+// ----------------------------------------------------------------------------
+
+const RowTest = {
+	'.default': () => {
+		const row = Row.default();
+		assertEquals(row.toString(), '');
+	},
+	'.from': () => {
+		// From string
+		const row = Row.from('xyz');
+		assertEquals(row.toString(), 'xyz');
+
+		// From existing Row
+		assertEquals(Row.from(row).toString(), row.toString());
+
+		// From 'chars'
+		assertEquals(Row.from(['😺', '😸', '😹']).toString(), '😺😸😹');
+	},
+	'.append': () => {
+		const row = Row.from('foo');
+		row.append('bar', FileType.default());
+		assertEquals(row.toString(), 'foobar');
+	},
+	'.delete': () => {
+		const row = Row.from('foof');
+		row.delete(3);
+		assertEquals(row.toString(), 'foo');
+
+		row.delete(4);
+		assertEquals(row.toString(), 'foo');
+	},
+	'.split': () => {
+		// When you split a row, it's from the cursor position
+		// (Kind of like if the string were one-indexed)
+		const row = Row.from('foobar');
+		const row2 = Row.from('bar');
+		assertEquals(row.split(3, FileType.default()).toString(), row2.toString());
+	},
+	'.find': () => {
+		const normalRow = Row.from('\tFor whom the bell tolls');
+		assertEquivalent(
+			normalRow.find('who', 0, SearchDirection.Forward),
+			Some(5),
+		);
+		assertEquals(normalRow.find('foo', 0, SearchDirection.Forward), None);
+
+		const emojiRow = Row.from('\t😺😸😹');
+		assertEquivalent(emojiRow.find('😹', 0, SearchDirection.Forward), Some(3));
+		assertEquals(emojiRow.find('🤰🏼', 10, SearchDirection.Forward), None);
+	},
+	'.find backwards': () => {
+		const normalRow = Row.from('For whom the bell tolls');
+		assertEquivalent(
+			normalRow.find('who', 23, SearchDirection.Backward),
+			Some(4),
+		);
+		assertEquals(normalRow.find('foo', 10, SearchDirection.Backward), None);
+
+		const emojiRow = Row.from('😺😸😹');
+		assertEquivalent(emojiRow.find('😸', 2, SearchDirection.Backward), Some(1));
+		assertEquals(emojiRow.find('🤰🏼', 10, SearchDirection.Backward), None);
+	},
+	'.byteIndexToCharIndex': () => {
+		// Each 'character' is two bytes
+		const row = Row.from('😺😸😹👨‍👩‍👧‍👦');
+		assertEquals(row.byteIndexToCharIndex(4), 2);
+		assertEquals(row.byteIndexToCharIndex(2), 1);
+		assertEquals(row.byteIndexToCharIndex(0), 0);
+
+		// Return count on nonsense index
+		assertEquals(Fn.strlen(row.toString()), 10);
+		assertEquals(row.byteIndexToCharIndex(72), 10);
+
+		const row2 = Row.from('foobar');
+		assertEquals(row2.byteIndexToCharIndex(2), 2);
+	},
+	'.charIndexToByteIndex': () => {
+		// Each 'character' is two bytes
+		const row = Row.from('😺😸😹👨‍👩‍👧‍👦');
+		assertEquals(row.charIndexToByteIndex(2), 4);
+		assertEquals(row.charIndexToByteIndex(1), 2);
+		assertEquals(row.charIndexToByteIndex(0), 0);
+	},
+	'.cxToRx, .rxToCx': () => {
+		const row = Row.from('foo\tbar\tbaz');
+		row.update(None, FileType.default());
+		assertNotEquals(row.chars, row.rchars);
+		assertNotEquals(row.size, row.rsize);
+		assertEquals(row.size, 11);
+		assertEquals(row.rsize, row.size + (SCROLL_TAB_SIZE * 2) - 2);
+
+		const cx = 11;
+		const aRx = row.cxToRx(cx);
+		const rx = 11;
+		const aCx = row.rxToCx(aRx);
+		assertEquals(aCx, cx);
+		assertEquals(aRx, rx);
+	},
+};
+
 // ----------------------------------------------------------------------------
 // Test Suite Setup
 // ----------------------------------------------------------------------------
 
 testSuite({
+	fns: fnTest(),
+	'readKey()': readKeyTest(),
 	'ANSI utils': ANSITest(),
 	Buffer: BufferTest,
 	Document: DocumentTest,
 	Editor: EditorTest,
+	FileType: FileTypeTest,
+	Option: OptionTest,
 	Position: PositionTest,
 	Row: RowTest,
-	fns: fnTest(),
-	'readKey()': readKeyTest(),
 });

src/common/ansi.ts

@@ -42,6 +42,7 @@ export enum AnsiColor {
 	FgMagenta,
 	FgCyan,
 	FgWhite,
+	ForegroundColor,
 	FgDefault,
 
 	// Background Colors
@@ -53,6 +54,7 @@ export enum AnsiColor {
 	BgMagenta,
 	BgCyan,
 	BgWhite,
+	BackgroundColor,
 	BgDefault,
 
 	// Bright Foreground Colors
@@ -77,8 +79,8 @@ export enum AnsiColor {
 }
 
 export enum Ground {
-	Fore = AnsiColor.FgDefault,
+	Fore = AnsiColor.ForegroundColor,
-	Back = AnsiColor.BgDefault,
+	Back = AnsiColor.BackgroundColor,
 }
 
 // ----------------------------------------------------------------------------
@@ -106,7 +108,6 @@ const moveCursorForward = (col: number): string => code(col, 'C');
 const moveCursorDown = (row: number): string => code(row, 'B');
 const textFormat = (param: string | number | string[] | number[]): string =>
 	code(param, 'm');
-const color = (value: AnsiColor): string => textFormat(value);
 const color256 = (value: number, ground: Ground = Ground.Fore): string =>
 	textFormat([ground, AnsiColor.Type256, value]);
 const rgb = (
@@ -116,6 +117,9 @@ const rgb = (
 	ground: Ground = Ground.Fore,
 ): string => textFormat([ground, AnsiColor.TypeRGB, r, g, b]);
 
+/**
+ * Ansi terminal codes and helper functions
+ */
 export const Ansi = {
 	ClearLine: code('K'),
 	ClearScreen: code('2J'),
@@ -129,7 +133,46 @@ export const Ansi = {
 	moveCursorForward,
 	moveCursorDown,
 	textFormat,
-	color,
+	color: {
+		Black: textFormat(AnsiColor.FgBlack),
+		Red: textFormat(AnsiColor.FgRed),
+		Green: textFormat(AnsiColor.FgGreen),
+		Yellow: textFormat(AnsiColor.FgYellow),
+		Blue: textFormat(AnsiColor.FgBlue),
+		Magenta: textFormat(AnsiColor.FgMagenta),
+		Cyan: textFormat(AnsiColor.FgCyan),
+		White: textFormat(AnsiColor.FgWhite),
+		Default: textFormat(AnsiColor.FgDefault),
+		BrightBlack: textFormat(AnsiColor.FgBrightBlack),
+		BrightRed: textFormat(AnsiColor.FgBrightRed),
+		BrightGreen: textFormat(AnsiColor.FgBrightGreen),
+		BrightYellow: textFormat(AnsiColor.FgBrightYellow),
+		BrightBlue: textFormat(AnsiColor.FgBrightBlue),
+		BrightMagenta: textFormat(AnsiColor.FgBrightMagenta),
+		BrightCyan: textFormat(AnsiColor.FgBrightCyan),
+		BrightWhite: textFormat(AnsiColor.FgBrightWhite),
+		Invert: textFormat(AnsiColor.Invert),
+		background: {
+			Black: textFormat(AnsiColor.BgBlack),
+			Red: textFormat(AnsiColor.BgRed),
+			Green: textFormat(AnsiColor.BgGreen),
+			Yellow: textFormat(AnsiColor.BgYellow),
+			Blue: textFormat(AnsiColor.BgBlue),
+			Magenta: textFormat(AnsiColor.BgMagenta),
+			Cyan: textFormat(AnsiColor.BgCyan),
+			White: textFormat(AnsiColor.BgWhite),
+			Default: textFormat(AnsiColor.BgDefault),
+			BrightBlack: textFormat(AnsiColor.BgBrightBlack),
+			BrightRed: textFormat(AnsiColor.BgBrightRed),
+			BrightGreen: textFormat(AnsiColor.BgBrightGreen),
+			BrightYellow: textFormat(AnsiColor.BgBrightYellow),
+			BrightBlue: textFormat(AnsiColor.BgBrightBlue),
+			BrightMagenta: textFormat(AnsiColor.BgBrightMagenta),
+			BrightCyan: textFormat(AnsiColor.BgBrightCyan),
+			BrightWhite: textFormat(AnsiColor.BgBrightWhite),
+			Invert: textFormat(AnsiColor.Invert),
+		},
+	},
 	color256,
 	rgb,
 };

src/common/buffer.ts

@@ -1,10 +1,17 @@
 import { strlen, truncate } from './fns.ts';
 import { getRuntime } from './runtime.ts';
 
+/**
+ * A simple string buffer
+ */
 class Buffer {
 	#b = '';
 
-	constructor() {
+	private constructor() {
+	}
+
+	public static default(): Buffer {
+		return new Buffer();
 	}
 
 	public append(s: string, maxLen?: number): void {

src/common/config.ts

@@ -1,13 +1,27 @@
-import { ITerminalSize } from './types.ts';
+import Ansi from './ansi.ts';
+import { HighlightType, ITerminalSize } from './types.ts';
 
-export const SCROLL_VERSION = '0.0.1';
+export const SCROLL_VERSION = '0.1.0';
 export const SCROLL_QUIT_TIMES = 3;
 export const SCROLL_TAB_SIZE = 4;
 
-export const SCROLL_LOG_FILE = './scroll.log';
+export const SCROLL_LOG_FILE_PREFIX = './scroll';
-export const SCROLL_ERR_FILE = './scroll.err';
+export const SCROLL_LOG_FILE_SUFFIX = '.log';
 
 export const defaultTerminalSize: ITerminalSize = {
 	rows: 24,
 	cols: 80,
 };
+
+export const SCROLL_COLOR_SCHEME: Map<HighlightType, string> = new Map([
+	[HighlightType.Match, Ansi.color.Invert], // Inverted color
+	[HighlightType.Number, Ansi.color256(196)], // Bright Red
+	[HighlightType.Character, Ansi.color256(207)], // Magenta
+	[HighlightType.String, Ansi.color256(45)], // Cyan
+	[HighlightType.SingleLineComment, Ansi.color256(248)], // Light Gray
+	[HighlightType.MultiLineComment, Ansi.color256(240)], // Medium-light Gray
+	[HighlightType.Keyword1, Ansi.color256(226)], // Yellow
+	[HighlightType.Keyword2, Ansi.color256(118)], // Green
+	[HighlightType.Operator, Ansi.color256(215)], // Orange/Brown
+	[HighlightType.None, Ansi.ResetFormatting],
+]);

src/common/document.ts

@@ -1,34 +1,36 @@
 import Row from './row.ts';
-import { arrayInsert, some, strlen } from './fns.ts';
+import { FileType } from './filetype.ts';
-import { HighlightType } from './highlight.ts';
+import { arrayInsert } from './fns.ts';
-import { getRuntime } from './runtime.ts';
+import Option, { None, Some } from './option.ts';
-import { Position } from './types.ts';
+import { getRuntime, logWarning } from './runtime.ts';
-import { Search } from './search.ts';
+import { Position, SearchDirection } from './types.ts';
 
 export class Document {
-	#rows: Row[];
+	/**
-	#search: Search;
+	 * Each line of the current document
+	 */
+	#rows: Row[] = [];
 
 	/**
-	 * Has the document been modified?
+	 * @param dirty - Has the document been modified?
+	 * @param type - The meta-data for the file type of the current document
 	 */
-	public dirty: boolean;
+	private constructor(
-
+		public dirty: boolean = false,
-	private constructor() {
+		public type: FileType = FileType.default(),
-		this.#rows = [];
+	) {
-		this.#search = new Search();
-		this.dirty = false;
 	}
 
-	get numRows(): number {
+	public get fileType(): string {
+		return this.type.name;
+	}
+
+	public get numRows(): number {
 		return this.#rows.length;
 	}
 
 	public static default(): Document {
-		const self = new Document();
+		return new Document();
-		self.#search.parent = self;
-
-		return self;
 	}
 
 	public isEmpty(): boolean {
@@ -46,9 +48,13 @@ export class Document {
 			this.#rows = [];
 		}
 
+		this.type = FileType.from(filename);
+
 		const rawFile = await file.openFile(filename);
 		rawFile.split(/\r?\n/)
-			.forEach((row) => this.insertRow(this.numRows, row));
+			.forEach((row: string) => {
+				this.#rows.push(Row.from(row));
+			});
 
 		this.dirty = false;
 
@@ -58,71 +64,104 @@ export class Document {
 	/**
 	 * Save the current document
 	 */
-	public async save(filename: string) {
+	public async save(filename: string): Promise<void> {
 		const { file } = await getRuntime();
 
 		await file.saveFile(filename, this.rowsToString());
+		this.type = FileType.from(filename);
 
 		this.dirty = false;
 	}
 
-	public resetFind() {
+	/**
-		this.#search = new Search();
+	 * Find the cursor position of the query, if it exists
-		this.#search.parent = this;
+	 *
-	}
+	 * @param q - the search query
-
+	 * @param at - the point from which to start the search
+	 * @param direction - which direction to search, backward or forward
+	 */
 	public find(
 		q: string,
-		key: string,
+		at: Position,
-	): Position | null {
+		direction: SearchDirection,
-		const potential = this.#search.search(q, key);
+	): Option<Position> {
-		if (some(potential) && potential instanceof Position) {
+		if (at.y >= this.numRows) {
-			// Update highlight of search match
+			logWarning('Trying to search beyond the end of the current file', {
-			const row = this.#rows[potential.y];
+				at,
+				document: this,
+			});
+			return None;
+		}
 
-			// Okay, we have to take the Javascript string index (potential.x), convert
+		const position = Position.from(at);
-			// it to the Row 'character' index, and then convert that to the Row render index
-			// so that the highlighted color starts in the right place.
-			const start = row.cxToRx(row.byteIndexToCharIndex(potential.x));
 
-			// Just to be safe with unicode searches, take the number of 'characters'
+		for (let y = at.y; y >= 0 && y < this.numRows; y += direction) {
-			// as the search query length, not the JS string length.
+			const maybeMatch = this.#rows[y].find(q, position.x, direction);
-			const end = start + strlen(q);
+			if (maybeMatch.isSome()) {
+				position.x = maybeMatch.unwrap();
+				return Some(position);
+			}
 
-			for (let i = start; i < end; i++) {
+			if (direction === SearchDirection.Forward) {
-				row.hl[i] = HighlightType.Match;
+				position.y += 1;
+				position.x = 0;
+			} else if (direction === SearchDirection.Backward) {
+				position.y -= 1;
+				position.x = this.#rows[position.y].size;
+
+				console.assert(position.y < this.numRows);
 			}
 		}
 
-		return potential;
+		return None;
-	}
-
-	public insert(at: Position, c: string): void {
-		if (at.y === this.numRows) {
-			this.insertRow(this.numRows, c);
-		} else {
-			this.#rows[at.y].insertChar(at.x, c);
-			this.#rows[at.y].update();
-		}
-
-		this.dirty = true;
 	}
 
+	/**
+	 * Insert a new line, splitting and/or creating a new row as needed
+	 */
 	public insertNewline(at: Position): void {
 		if (at.y > this.numRows) {
 			return;
 		}
 
+		this.dirty = true;
+
+		// Just add a simple blank line
 		if (at.y === this.numRows) {
 			this.#rows.push(Row.default());
+
 			return;
 		}
 
-		const newRow = this.#rows[at.y].split(at.x);
+		// Split the current row, and insert a new
-		newRow.update();
+		// row with the leftovers
+		const currentRow = this.#rows[at.y];
+		const newRow = currentRow.split(at.x, this.type);
 		this.#rows = arrayInsert(this.#rows, at.y + 1, newRow);
+	}
+
+	public insert(at: Position, c: string): void {
+		if (at.y > this.numRows) {
+			return;
+		}
 
 		this.dirty = true;
+
+		if (at.y === this.numRows) {
+			this.#rows.push(Row.from(c));
+		} else {
+			this.#rows[at.y].insertChar(at.x, c);
+		}
+
+		this.unHighlightRows(at.y);
+	}
+
+	protected unHighlightRows(start: number): void {
+		if (this.numRows < start && start >= 1) {
+			for (let i = start - 1; i < this.numRows; i++) {
+				this.#rows[i].isHighlighted = false;
+			}
+		}
 	}
 
 	/**
@@ -135,65 +174,71 @@ export class Document {
 			return;
 		}
 
-		const row = this.row(at.y)!;
+		this.dirty = true;
-		const mergeNextRow = at.x === row.size && at.y + 1 < len;
+
-		const mergeIntoPrevRow = at.x === 0 && at.y > 0;
+		const maybeRow = this.row(at.y);
+		if (maybeRow.isNone()) {
+			return;
+		}
+
+		const row = maybeRow.unwrap();
+
+		const mergeNextRow = at.x === row.size && this.row(at.y + 1).isSome();
 
 		// If we are at the end of a line, and press delete,
 		// add the contents of the next row, and delete
-		// the merged row object
+		// the merged row object (This also works for pressing
+		// backspace at the beginning of a line: the cursor is
+		// moved to the end of the previous line)
 		if (mergeNextRow) {
 			// At the end of a line, pressing delete will merge
-			// the next line into the current on
+			// the next line into the current one
-			const rowToAppend = this.#rows.at(at.y + 1)!.toString();
+			const rowToAppend = this.#rows[at.y + 1].toString();
-			row.append(rowToAppend);
+			row.append(rowToAppend, this.type);
 			this.deleteRow(at.y + 1);
-		} else if (mergeIntoPrevRow) {
-			// At the beginning of a line, merge the current line
-			// into the previous Row
-			const rowToAppend = row.toString();
-			this.#rows[at.y - 1].append(rowToAppend);
-			this.deleteRow(at.y);
 		} else {
 			row.delete(at.x);
 		}
 
-		row.update();
+		this.unHighlightRows(at.y);
-
-		this.dirty = true;
 	}
 
-	public row(i: number): Row | null {
+	public row(i: number): Option<Row> {
-		return this.#rows[i] ?? null;
+		if (i >= this.numRows || i < 0) {
+			return None;
+		}
+
+		return Option.from(this.#rows.at(i));
 	}
 
-	public insertRow(at: number = this.numRows, s: string = ''): void {
+	public highlight(searchMatch: Option<string>, limit: Option<number>): void {
-		this.#rows = arrayInsert(this.#rows, at, Row.from(s));
+		let startWithComment = false;
-		this.#rows[at].update();
+		let until = this.numRows;
+		if (limit.isSome() && (limit.unwrap() + 1 < this.numRows)) {
+			until = limit.unwrap() + 1;
+		}
 
-		this.dirty = true;
+		for (let i = 0; i < until; i++) {
-	}
+			startWithComment = this.#rows[i].update(
-
+				searchMatch,
-	public highlight(searchMatch?: string): void {
+				this.type,
-		this.#rows.forEach((row) => {
+				startWithComment,
-			row.update(searchMatch);
+			);
-		});
+		}
 	}
 
 	/**
 	 * Delete the specified row
 	 * @param at - the index of the row to delete
-	 * @private
 	 */
-	private deleteRow(at: number): void {
+	protected deleteRow(at: number): void {
 		this.#rows.splice(at, 1);
 	}
 
 	/**
 	 * Convert the array of row objects into one string
-	 * @private
 	 */
-	private rowsToString(): string {
+	protected rowsToString(): string {
 		return this.#rows.map((r) => r.toString()).join('\n');
 	}
 }

src/common/filetype.ts

@@ -0,0 +1,5 @@
+export * from './filetype/base.ts';
+export * from './filetype/filetype.ts';
+
+import FileType from './filetype/filetype.ts';
+export default FileType;

src/common/filetype/base.ts

@@ -0,0 +1,91 @@
+import Option, { None } from '../option.ts';
+
+// ----------------------------------------------------------------------------
+// File-related types
+// ----------------------------------------------------------------------------
+
+export enum FileLang {
+	C = 'C',
+	CPP = 'C++',
+	TypeScript = 'TypeScript',
+	JavaScript = 'JavaScript',
+	PHP = 'PHP',
+	Go = 'Golang',
+	Rust = 'Rust',
+	CSS = 'CSS',
+	Shell = 'Shell',
+	Plain = 'Plain Text',
+}
+
+export interface HighlightingOptions {
+	characters: boolean;
+	numbers: boolean;
+	octalNumbers: boolean;
+	hexNumbers: boolean;
+	binNumbers: boolean;
+	jsBigInt: boolean;
+	strings: boolean;
+}
+
+interface IFileType {
+	readonly name: FileLang;
+	readonly singleLineComment: Option<string>;
+	readonly multiLineCommentStart: Option<string>;
+	readonly multiLineCommentEnd: Option<string>;
+	readonly keywords1: string[];
+	readonly keywords2: string[];
+	readonly operators: string[];
+	readonly hlOptions: HighlightingOptions;
+	get flags(): HighlightingOptions;
+	get primaryKeywords(): string[];
+	get secondaryKeywords(): string[];
+	hasMultilineComments(): boolean;
+}
+
+/**
+ * The base class for File Types
+ */
+export abstract class AbstractFileType implements IFileType {
+	public readonly name: FileLang = FileLang.Plain;
+	public readonly singleLineComment = None;
+	public readonly multiLineCommentStart: Option<string> = None;
+	public readonly multiLineCommentEnd: Option<string> = None;
+	public readonly keywords1: string[] = [];
+	public readonly keywords2: string[] = [];
+	public readonly operators: string[] = [];
+	public readonly hlOptions: HighlightingOptions = {
+		characters: false,
+		numbers: false,
+		octalNumbers: false,
+		hexNumbers: false,
+		binNumbers: false,
+		jsBigInt: false,
+		strings: false,
+	};
+
+	get flags(): HighlightingOptions {
+		return this.hlOptions;
+	}
+
+	get primaryKeywords(): string[] {
+		return this.keywords1;
+	}
+
+	get secondaryKeywords(): string[] {
+		return this.keywords2;
+	}
+
+	public hasMultilineComments(): boolean {
+		return this.multiLineCommentStart.and(this.multiLineCommentEnd).isSome();
+	}
+}
+
+export const defaultHighlightOptions: HighlightingOptions = {
+	characters: false,
+	numbers: true,
+	octalNumbers: false,
+	hexNumbers: false,
+	binNumbers: false,
+	jsBigInt: false,
+	strings: true,
+};

src/common/filetype/c.ts

@@ -0,0 +1,151 @@
+import Option, { Some } from '../option.ts';
+import {
+	AbstractFileType,
+	defaultHighlightOptions,
+	FileLang,
+	HighlightingOptions,
+} from './base.ts';
+
+export class CFile extends AbstractFileType {
+	public readonly name: FileLang = FileLang.C;
+	public readonly singleLineComment = Some('//');
+	public readonly multiLineCommentStart: Option<string> = Some('/*');
+	public readonly multiLineCommentEnd: Option<string> = Some('*/');
+	public readonly keywords1 = [
+		'continue',
+		'register',
+		'restrict',
+		'volatile',
+		'default',
+		'typedef',
+		'typedef',
+		'switch',
+		'return',
+		'static',
+		'struct',
+		'extern',
+		'inline',
+		'return',
+		'sizeof',
+		'switch',
+		'break',
+		'const',
+		'while',
+		'break',
+		'union',
+		'class',
+		'union',
+		'auto',
+		'case',
+		'else',
+		'enum',
+		'case',
+		'for',
+		'do',
+		'if',
+	];
+	public readonly keywords2 = [
+		'#include',
+		'unsigned',
+		'uint32_t',
+		'uint64_t',
+		'uint16_t',
+		'#define',
+		'#ifndef',
+		'wchar_t',
+		'int32_t',
+		'int64_t',
+		'int16_t',
+		'uint8_t',
+		'double',
+		'signed',
+		'#endif',
+		'#ifdef',
+		'#error',
+		'#undef',
+		'int8_t',
+		'time_t',
+		'size_t',
+		'float',
+		'#elif',
+		'long',
+		'char',
+		'void',
+		'int',
+		'#if',
+	];
+	public readonly operators = [
+		'>>>=',
+		'**=',
+		'&&=',
+		'||=',
+		'??=',
+		'>>>',
+		'<=>',
+		'<<=',
+		'>>=',
+		'+=',
+		'-=',
+		'*=',
+		'/=',
+		'%=',
+		'&=',
+		'^=',
+		'|=',
+		'==',
+		'!=',
+		'>=',
+		'<=',
+		'++',
+		'--',
+		'**',
+		'<<',
+		'>>',
+		'&&',
+		'||',
+		'??',
+		'?.',
+		'++',
+		'--',
+		'==',
+		'!=',
+		'>=',
+		'<=',
+		'&&',
+		'||',
+		'<<',
+		'>>',
+		'+=',
+		'-=',
+		'*=',
+		'/=',
+		'%=',
+		'&=',
+		'|=',
+		'^=',
+		'->',
+		'::',
+		'?',
+		':',
+		'=',
+		'>',
+		'<',
+		'%',
+		'-',
+		'+',
+		'*',
+		'&',
+		'|',
+		'^',
+		'~',
+		'!',
+		'.',
+		',',
+		';',
+	];
+	public readonly hlOptions: HighlightingOptions = {
+		...defaultHighlightOptions,
+		characters: true,
+		hexNumbers: true,
+	};
+}

src/common/filetype/css.ts

@@ -0,0 +1,393 @@
+import Option, { None, Some } from '../option.ts';
+import {
+	AbstractFileType,
+	defaultHighlightOptions,
+	FileLang,
+	HighlightingOptions,
+} from './base.ts';
+
+export class CSSFile extends AbstractFileType {
+	public readonly name: FileLang = FileLang.CSS;
+	public readonly singleLineComment = None;
+	public readonly multiLineCommentStart: Option<string> = Some('/*');
+	public readonly multiLineCommentEnd: Option<string> = Some('*/');
+	public readonly keywords1 = [
+		':active',
+		':any-link',
+		':autofill',
+		':checked',
+		':default',
+		':disabled',
+		':empty',
+		':enabled',
+		':first-child',
+		':first-of-type',
+		':focus-visible',
+		':focus-within',
+		':focus',
+		':fullscreen',
+		':hover',
+		':in-range',
+		':indeterminate',
+		':invalid',
+		':last-child',
+		':last-of-type',
+		':link',
+		':modal',
+		':nth-child',
+		':nth-last-child',
+		':nth-last-of-type',
+		':nth-of-type',
+		':only-child',
+		':only-of-type',
+		':optional',
+		':out-of-range',
+		':paused',
+		':picture-in-picture',
+		':placeholder-shown',
+		':playing',
+		':read-only',
+		':read-write',
+		':required',
+		':root',
+		':scope',
+		':target',
+		':user-valid',
+		':valid',
+		':visited',
+		'::after',
+		'::backdrop',
+		'::before',
+		'::cue',
+		'::file-selector-button',
+		'::first-letter',
+		'::first-line',
+		'::grammar-error',
+		'::marker',
+		'::placeholder',
+		'::selection',
+		'::spelling-error',
+		'@charset',
+		'@color-profile',
+		'@container',
+		'@counter-style',
+		'@font-face',
+		'@font-feature-values',
+		'@font-palette-values',
+		'@import',
+		'@keyframes',
+		'@layer',
+		'@media',
+		'@namespace',
+		'@page',
+		'@position-try',
+		'@property',
+		'@scope',
+		'@starting-style',
+		'@supports',
+		'@view-transition',
+	];
+	public readonly keywords2 = [
+		'animation-range-end',
+		'animation-range-start',
+		'accent-color',
+		'animation-timeline',
+		'animation',
+		'animation-timing-function',
+		'animation-composition',
+		'animation-delay',
+		'animation-direction',
+		'appearance',
+		'align-content',
+		'animation-duration',
+		'align-items',
+		'animation-fill-mode',
+		'align-self',
+		'animation-iteration-count',
+		'aspect-ratio',
+		'align-tracks',
+		'animation-name',
+		'all',
+		'animation-play-state',
+		'animation-name',
+		'anchor-name',
+		'border-block-start-color',
+		'border-inline-style',
+		'backdrop-filter',
+		'border-block-start-style',
+		'border-inline-width',
+		'backface-visibility',
+		'border-block-start-width',
+		'border-left',
+		'background',
+		'border-block-style',
+		'border-left-color',
+		'background-attachment',
+		'border-block-width',
+		'border-left-style',
+		'background-blend-mode',
+		'border-bottom',
+		'border-left-width',
+		'background-clip',
+		'border-bottom-color',
+		'border-radius',
+		'background-color',
+		'border-bottom-left-radius',
+		'border-right',
+		'background-image',
+		'border-bottom-right-radius',
+		'border-right-color',
+		'background-origin',
+		'border-bottom-style',
+		'border-right-style',
+		'background-position',
+		'border-bottom-width',
+		'border-right-width',
+		'background-position-x',
+		'border-collapse',
+		'border-spacing',
+		'background-position-y',
+		'border-color',
+		'border-start-end-radius',
+		'background-repeat',
+		'border-end-end-radius',
+		'border-start-start-radius',
+		'background-size',
+		'border-end-start-radius',
+		'border-style',
+		'border-image',
+		'border-top',
+		'border-image-outset',
+		'border-top-color',
+		'border-image-repeat',
+		'border-top-left-radius',
+		'border-image-slice',
+		'border-top-right-radius',
+		'border-image-source',
+		'border-top-style',
+		'border-image-width',
+		'border-top-width',
+		'border-inline',
+		'border-width',
+		'block-size',
+		'border-inline-color',
+		'bottom',
+		'border-inline-end',
+		'border',
+		'border-inline-end-color',
+		'box-decoration-break',
+		'border-block',
+		'border-inline-end-style',
+		'box-shadow',
+		'border-block-color',
+		'border-inline-end-width',
+		'box-sizing',
+		'border-block-end',
+		'border-inline-start',
+		'break-after',
+		'border-block-end-color',
+		'border-inline-start-color',
+		'break-before',
+		'border-block-end-style',
+		'border-inline-start-style',
+		'break-inside',
+		'border-block-end-width',
+		'border-inline-start-width',
+		'border-block-start',
+		'column-rule',
+		'content-visibility',
+		'caption-side',
+		'column-rule-color',
+		'column-rule-style',
+		'caret-color',
+		'column-rule-width',
+		'column-span',
+		'counter-increment',
+		'column-width',
+		'counter-reset',
+		'columns',
+		'counter-set',
+		'contain',
+		'contain-intrinsic-block-size',
+		'clear',
+		'contain-intrinsic-height',
+		'clip',
+		'contain-intrinsic-inline-size',
+		'clip-path',
+		'color',
+		'contain-intrinsic-width',
+		'cursor',
+		'color-scheme',
+		'container',
+		'column-count',
+		'container-name',
+		'column-fill',
+		'container-type',
+		'column-gap',
+		'content',
+		'direction',
+		'display',
+		'empty-cells',
+		'font-synthesis-position',
+		'field-sizing',
+		'font',
+		'font-synthesis-small-caps',
+		'filter',
+		'font-synthesis-style',
+		'font-synthesis-weight',
+		'font-family',
+		'font-variant',
+		'font-variant-alternates',
+		'font-variant-caps',
+		'font-feature-settings',
+		'font-variant-east-asian',
+		'font-variant-emoji',
+		'font-variant-ligatures',
+		'font-variant-numeric',
+		'font-variant-position',
+		'flex',
+		'font-kerning',
+		'font-variation-settings',
+		'flex-basis',
+		'font-language-override',
+		'flex-direction',
+		'font-optical-sizing',
+		'flex-flow',
+		'font-palette',
+		'font-weight',
+		'flex-grow',
+		'flex-shrink',
+		'font-size',
+		'forced-color-adjust',
+		'flex-wrap',
+		'font-size-adjust',
+		'font-stretch',
+		'float',
+		'font-style',
+		'font-synthesis',
+		'grid-auto-columns',
+		'grid-row-end',
+		'gap',
+		'grid-auto-flow',
+		'grid-row-start',
+		'grid-auto-rows',
+		'grid-template',
+		'grid-column',
+		'grid-template-areas',
+		'grid-column-end',
+		'grid-template-columns',
+		'grid',
+		'grid-column-start',
+		'grid-template-rows',
+		'grid-area',
+		'grid-row',
+		'hanging-punctuation',
+		'hyphenate-character',
+		'hyphenate-limit-chars',
+		'height',
+		'hyphens',
+		'initial',
+		'inset-inline',
+		'initial-letter',
+		'inset-inline-end',
+		'image-orientation',
+		'image-rendering',
+		'inline-size',
+		'image-resolution',
+		'inset',
+		'isolation',
+		'inset-area',
+		'inset-block',
+		'inherit',
+		'inset-block-end',
+		'inset-block-start',
+		'justify-content',
+		'justify-self',
+		'justify-items',
+		'justify-tracks',
+		'letter-spacing',
+		'list-style',
+		'list-style-image',
+		'line-break',
+		'list-style-position',
+		'line-clamp',
+		'list-style-type',
+		'line-height',
+		'left',
+		'line-height-step',
+		'mask-border-outset',
+		'margin',
+		'mask-border-repeat',
+		'margin-block',
+		'mask-border-slice',
+		'margin-block-end',
+		'mask-border-source',
+		'margin-block-start',
+		'mask-border-width',
+		'max-height',
+		'margin-bottom',
+		'mask-clip',
+		'max-inline-size',
+		'margin-inline',
+		'mask-composite',
+		'margin-inline-end',
+		'mask-image',
+		'max-width',
+		'margin-inline-start',
+		'mask-mode',
+		'margin-left',
+		'mask-origin',
+		'margin-right',
+		'mask-position',
+		'min-block-size',
+		'margin-top',
+		'mask-repeat',
+		'min-height',
+		'margin-trim',
+		'mask-size',
+		'min-inline-size',
+		'mask-type',
+		'min-width',
+		'masonry-auto-flow',
+		'mask',
+		'math-depth',
+		'mix-blend-mode',
+		'mask-border',
+		'math-shift',
+		'mask-border-mode',
+		'math-style',
+		'object-fit',
+		'order',
+		'overflow-inline',
+		'object-position',
+		'overflow-wrap',
+		'offset',
+		'orphans',
+		'overflow-x',
+		'offset-anchor',
+		'overflow-y',
+		'offset-distance',
+		'outline',
+		'overlay',
+		'offset-path',
+		'outline-color',
+		'offset-position',
+		'outline-offset',
+		'offset-rotate',
+		'outline-style',
+		'overscroll-behavior',
+		'outline-width',
+		'overscroll-behavior-block',
+		'overscroll-behavior-inline',
+		'opacity',
+		'overflow-anchor',
+		'overscroll-behavior-x',
+		'overflow-block',
+		'overscroll-behavior-y',
+		'overflow-clip-margin',
+	];
+	public readonly operators = ['::', ':', ',', '+', '>', '~', '-'];
+	public readonly hlOptions: HighlightingOptions = {
+		...defaultHighlightOptions,
+	};
+}

src/common/filetype/filetype.ts

@@ -0,0 +1,41 @@
+import { node_path as path } from '../runtime.ts';
+import { AbstractFileType } from './base.ts';
+import { CFile } from './c.ts';
+import { CSSFile } from './css.ts';
+import { JavaScriptFile, TypeScriptFile } from './javascript.ts';
+import { RustFile } from './rust.ts';
+import { ShellFile } from './shell.ts';
+
+// ----------------------------------------------------------------------------
+// External interface
+// ----------------------------------------------------------------------------
+
+export const fileTypeMap = new Map([
+	['.bash', ShellFile],
+	['.c', CFile],
+	['.css', CSSFile],
+	['.h', CFile],
+	['.js', JavaScriptFile],
+	['.json', JavaScriptFile],
+	['.jsx', JavaScriptFile],
+	['.mjs', JavaScriptFile],
+	['.rs', RustFile],
+	['.sh', ShellFile],
+	['.ts', TypeScriptFile],
+	['.tsx', TypeScriptFile],
+]);
+
+export class FileType extends AbstractFileType {
+	public static default(): FileType {
+		return new FileType();
+	}
+
+	public static from(filename: string): FileType {
+		const ext = path.extname(filename);
+		const type = fileTypeMap.get(ext) ?? FileType;
+
+		return new type();
+	}
+}
+
+export default FileType;

src/common/filetype/javascript.ts

@@ -0,0 +1,152 @@
+import Option, { Some } from '../option.ts';
+import {
+	AbstractFileType,
+	defaultHighlightOptions,
+	FileLang,
+	HighlightingOptions,
+} from './base.ts';
+
+export class JavaScriptFile extends AbstractFileType {
+	public readonly name: FileLang = FileLang.JavaScript;
+	public readonly singleLineComment = Some('//');
+	public readonly multiLineCommentStart: Option<string> = Some('/*');
+	public readonly multiLineCommentEnd: Option<string> = Some('*/');
+	public readonly keywords1 = [
+		'=>',
+		'await',
+		'break',
+		'case',
+		'catch',
+		'class',
+		'const',
+		'continue',
+		'debugger',
+		'default',
+		'delete',
+		'do',
+		'else',
+		'export',
+		'extends',
+		'false',
+		'finally',
+		'for',
+		'function',
+		'if',
+		'import',
+		'in',
+		'instanceof',
+		'let',
+		'new',
+		'null',
+		'return',
+		'static',
+		'super',
+		'switch',
+		'this',
+		'throw',
+		'true',
+		'try',
+		'typeof',
+		'var',
+		'void',
+		'while',
+		'with',
+		'yield',
+	];
+	public readonly keywords2 = [
+		'arguments',
+		'as',
+		'async',
+		'BigInt',
+		'Boolean',
+		'eval',
+		'from',
+		'get',
+		'JSON',
+		'Math',
+		'Number',
+		'Object',
+		'of',
+		'set',
+		'String',
+		'Symbol',
+		'undefined',
+	];
+	public readonly operators = [
+		'>>>=',
+		'**=',
+		'<<=',
+		'>>=',
+		'&&=',
+		'||=',
+		'??=',
+		'===',
+		'!==',
+		'>>>',
+		'+=',
+		'-=',
+		'*=',
+		'/=',
+		'%=',
+		'&=',
+		'^=',
+		'|=',
+		'==',
+		'!=',
+		'>=',
+		'<=',
+		'++',
+		'--',
+		'**',
+		'<<',
+		'>>',
+		'&&',
+		'||',
+		'??',
+		'?.',
+		'?',
+		':',
+		'=',
+		'>',
+		'<',
+		'%',
+		'-',
+		'+',
+		'&',
+		'|',
+		'^',
+		'~',
+		'!',
+		'.',
+		',',
+		';',
+	];
+	public readonly hlOptions: HighlightingOptions = {
+		...defaultHighlightOptions,
+		octalNumbers: true,
+		hexNumbers: true,
+		binNumbers: true,
+		jsBigInt: true,
+	};
+}
+
+export class TypeScriptFile extends JavaScriptFile {
+	public readonly name: FileLang = FileLang.TypeScript;
+	public readonly keywords2 = [
+		...super.secondaryKeywords,
+		// Typescript-specific
+		'any',
+		'bigint',
+		'boolean',
+		'enum',
+		'interface',
+		'keyof',
+		'number',
+		'private',
+		'protected',
+		'public',
+		'string',
+		'type',
+		'unknown',
+	];
+}

src/common/filetype/rust.ts

@@ -0,0 +1,169 @@
+import Option, { Some } from '../option.ts';
+import {
+	AbstractFileType,
+	defaultHighlightOptions,
+	FileLang,
+	HighlightingOptions,
+} from './base.ts';
+
+export class RustFile extends AbstractFileType {
+	public readonly name: FileLang = FileLang.Rust;
+	public readonly singleLineComment = Some('//');
+	public readonly multiLineCommentStart: Option<string> = Some('/*');
+	public readonly multiLineCommentEnd: Option<string> = Some('*/');
+	public readonly keywords1 = [
+		'continue',
+		'return',
+		'static',
+		'struct',
+		'unsafe',
+		'break',
+		'const',
+		'crate',
+		'extern',
+		'match',
+		'super',
+		'trait',
+		'where',
+		'else',
+		'enum',
+		'false',
+		'impl',
+		'loop',
+		'move',
+		'self',
+		'type',
+		'while',
+		'for',
+		'let',
+		'mod',
+		'pub',
+		'ref',
+		'true',
+		'use',
+		'mut',
+		'as',
+		'fn',
+		'if',
+		'in',
+	];
+	public readonly keywords2 = [
+		'DoubleEndedIterator',
+		'ExactSizeIterator',
+		'IntoIterator',
+		'PartialOrd',
+		'PartialEq',
+		'Iterator',
+		'ToString',
+		'Default',
+		'ToOwned',
+		'Extend',
+		'FnOnce',
+		'Option',
+		'String',
+		'AsMut',
+		'AsRef',
+		'Clone',
+		'Debug',
+		'FnMut',
+		'Sized',
+		'Unpin',
+		'array',
+		'isize',
+		'usize',
+		'&str',
+		'Copy',
+		'Drop',
+		'From',
+		'Into',
+		'None',
+		'Self',
+		'Send',
+		'Some',
+		'Sync',
+		'bool',
+		'char',
+		'i128',
+		'u128',
+		'Box',
+		'Err',
+		'Ord',
+		'Vec',
+		'dyn',
+		'f32',
+		'f64',
+		'i16',
+		'i32',
+		'i64',
+		'str',
+		'u16',
+		'u32',
+		'u64',
+		'Eq',
+		'Fn',
+		'Ok',
+		'i8',
+		'u8',
+		'&mut self',
+		'&mut',
+		'&self',
+		'self',
+	];
+	public readonly operators = [
+		'||=',
+		'>>=',
+		'<=>',
+		'<<=',
+		'&&=',
+		'**=',
+		'..=',
+		'...',
+		'||',
+		'|=',
+		'>>',
+		'>=',
+		'=>',
+		'==',
+		'<=',
+		'<<',
+		'<-',
+		'+=',
+		'++',
+		'^=',
+		'%=',
+		'&=',
+		'&&',
+		'/=',
+		'*=',
+		'**',
+		'..',
+		'!=',
+		':=',
+		'::',
+		'->',
+		'-=',
+		'--',
+		'~',
+		'|',
+		'>',
+		'=',
+		'<',
+		'+',
+		'^',
+		'%',
+		'&',
+		'*',
+		'.',
+		'!',
+		':',
+		';',
+		',',
+		'-',
+	];
+	public readonly hlOptions: HighlightingOptions = {
+		...defaultHighlightOptions,
+		characters: true,
+		binNumbers: true,
+		hexNumbers: true,
+	};
+}

src/common/filetype/shell.ts

@@ -0,0 +1,37 @@
+import { Some } from '../option.ts';
+import {
+	AbstractFileType,
+	defaultHighlightOptions,
+	FileLang,
+	HighlightingOptions,
+} from './base.ts';
+
+export class ShellFile extends AbstractFileType {
+	public readonly name: FileLang = FileLang.Shell;
+	public readonly singleLineComment = Some('#');
+	public readonly keywords1 = [
+		'case',
+		'do',
+		'done',
+		'elif',
+		'else',
+		'esac',
+		'fi',
+		'for',
+		'function',
+		'if',
+		'in',
+		'select',
+		'then',
+		'time',
+		'until',
+		'while',
+		'declare',
+	];
+	public readonly keywords2 = ['set'];
+	public readonly operators = ['[[', ']]'];
+	public readonly hlOptions: HighlightingOptions = {
+		...defaultHighlightOptions,
+		numbers: false,
+	};
+}

src/common/fns.ts

@@ -1,4 +1,6 @@
-import { KeyCommand } from './ansi.ts';
+import Ansi, { KeyCommand } from './ansi.ts';
+import { SCROLL_COLOR_SCHEME } from './config.ts';
+import { HighlightType } from './types.ts';
 
 const decoder = new TextDecoder();
 
@@ -11,20 +13,6 @@ const decoder = new TextDecoder();
  */
 export const noop = () => {};
 
-/**
- * Does a value exist? (not null or undefined)
- */
-export function some(v: unknown): boolean {
-	return v !== null && typeof v !== 'undefined';
-}
-
-/**
- * Is the value null or undefined?
- */
-export function none(v: unknown): boolean {
-	return v === null || typeof v === 'undefined';
-}
-
 /**
  * Convert input from ANSI escape sequences into a form
  * that can be more easily mapped to editor commands
@@ -42,7 +30,7 @@ export function readKey(raw: Uint8Array): string {
 		return parsed;
 	}
 
-	// Some keycodes have multiple potential inputs
+	// Some key codes have multiple potential inputs
 	switch (parsed) {
 		case '\x1b[1~':
 		case '\x1b[7~':
@@ -71,12 +59,23 @@ export function readKey(raw: Uint8Array): string {
 	}
 }
 
+/**
+ * Return the configured ANSI formatting escape codes for the
+ * type of syntax specified
+ *
+ * @param type The type of syntax to highlight
+ */
+export function highlightToColor(type: HighlightType): string {
+	return SCROLL_COLOR_SCHEME.get(type) ?? Ansi.ResetFormatting;
+}
+
 // ----------------------------------------------------------------------------
 // Array manipulation
 // ----------------------------------------------------------------------------
 
 /**
  * Insert a value into an array at the specified index
+ *
  * @param arr - the array
  * @param at - the index to insert at
  * @param value - what to add into the array
@@ -101,6 +100,7 @@ export function arrayInsert<T>(
 
 /**
  * Subtract two numbers, returning a zero if the result is negative
+ *
  * @param l
  * @param s
  */
@@ -149,10 +149,10 @@ export function ord(s: string): number {
 /**
  * Split a string by graphemes, not just bytes
  *
- * @param s - the string to split into 'characters'
+ * @param s - the string to split into unicode code points
  */
 export function strChars(s: string): string[] {
-	return s.split(/(?:)/u);
+	return [...s];
 }
 
 /**
@@ -164,6 +164,17 @@ export function strlen(s: string): number {
 	return strChars(s).length;
 }
 
+/**
+ * Get a slice of a string
+ *
+ * @param s - the string
+ * @param from - the 'character' index of the start of the slice
+ * @param to - the 'character' index of the last character you want
+ */
+export function substr(s: string, from: number, to?: number): string {
+	return strChars(s).slice(from, to).join('');
+}
+
 /**
  * Are all the characters in the string in ASCII range?
  *
@@ -193,6 +204,15 @@ export function isControl(char: string): boolean {
 	return isAscii(char) && (code === 0x7f || code < 0x20);
 }
 
+/**
+ * Is the one char string a common separator/operator character
+ *
+ * @param char - a one character string to check
+ */
+export function isSeparator(char: string): boolean {
+	return /\s/.test(char) || char === '\0' || ',.()+-/*=~%<>[];'.includes(char);
+}
+
 /**
  * Get the key code for a ctrl chord
  *

src/common/highlight.ts

@@ -1,20 +0,0 @@
-import Ansi from './ansi.ts';
-
-export enum HighlightType {
-	None,
-	Number,
-	Match,
-}
-
-export function highlightToColor(type: HighlightType): string {
-	switch (type) {
-		case HighlightType.Number:
-			return Ansi.color256(196);
-
-		case HighlightType.Match:
-			return Ansi.color256(21);
-
-		default:
-			return Ansi.ResetFormatting;
-	}
-}

src/common/main.ts

@@ -1,9 +1,18 @@
-import process from 'node:process';
 import { readKey } from './fns.ts';
-import { getRuntime, logError } from './runtime.ts';
+import {
+	getRuntime,
+	logError,
+	logWarning,
+	node_process as process,
+} from './runtime.ts';
 import Editor from './editor.ts';
 
-export async function main() {
+/**
+ * The main runtime loop
+ *
+ * Only returns on error or quit
+ */
+export async function main(): Promise<void> {
 	const rt = await getRuntime();
 	const { term } = rt;
 
@@ -14,15 +23,13 @@ export async function main() {
 	});
 
 	// Setup error handler to log to file
-	rt.onEvent('error', (error) => {
+	rt.onEvent('error', (error: any) => {
 		process.stdin.setRawMode(false);
 		logError(JSON.stringify(error, null, 2));
 	});
 
-	const terminalSize = await term.getTerminalSize();
-
 	// Create the editor itself
-	const editor = new Editor(terminalSize);
+	const editor = Editor.create(await term.getTerminalSize());
 
 	// Process cli arguments
 	if (term.argv.length > 0) {
@@ -43,7 +50,9 @@ export async function main() {
 		for await (const char of term.inputLoop()) {
 			const parsed = readKey(char);
 			if (char.length === 0 || parsed.length === 0) {
-				continue;
+				logWarning('Empty input returned from runtime input loop');
+
+				return;
 			}
 
 			// Process input
@@ -51,6 +60,9 @@ export async function main() {
 			if (!shouldLoop) {
 				return;
 			}
+
+			// Render output
+			await editor.refreshScreen();
 		}
 	}
 }

src/common/option.ts

@@ -0,0 +1,261 @@
+/**
+ * The sad, lonely enum that should be more tightly coupled
+ * to the Option type...but this isn't Rust
+ */
+enum OptionType {
+	Some = 'Some',
+	None = 'None',
+}
+
+// ----------------------------------------------------------------------------
+// Typeguards to handle Some/None difference
+// ----------------------------------------------------------------------------
+
+const isOption = <T>(v: any): v is Option<T> => v instanceof Option;
+
+class OptNone {
+	public type: OptionType = OptionType.None;
+}
+
+class OptSome<T> {
+	public type: OptionType = OptionType.Some;
+
+	constructor(public value: T) {}
+}
+
+type OptType<T> = OptNone | OptSome<T>;
+
+const isSome = <T>(v: OptType<T>): v is OptSome<T> =>
+	'value' in v && v.type === OptionType.Some;
+
+/**
+ * Rust-style optional type
+ *
+ * Based on https://gist.github.com/s-panferov/575da5a7131c285c0539
+ */
+export class Option<T> {
+	/**
+	 * The placeholder for the 'None' value type
+	 */
+	private static _None: Option<any> = new Option(null);
+
+	/**
+	 * Is this a 'Some' or a 'None'?
+	 */
+	private readonly inner: OptType<T>;
+
+	private constructor(v?: T) {
+		this.inner = (v !== undefined && v !== null)
+			? new OptSome(v)
+			: new OptNone();
+	}
+
+	/**
+	 * The equivalent of the Rust `Option`.`None` enum value
+	 */
+	public static get None(): Option<any> {
+		return Option._None;
+	}
+
+	/**
+	 * The equivalent of the Rust `Option`.`Some` enum value
+	 *
+	 * If the value passed is null or undefined, this will throw an Error
+	 *
+	 * @param v The value to wrap
+	 */
+	public static Some<X>(v: any): Option<X> | never {
+		const maybeSome: Option<X> = Option.from(v);
+
+		if (maybeSome.isNone()) {
+			throw new Error('Cannot create Some<T> with an empty value');
+		} else {
+			return maybeSome;
+		}
+	}
+
+	/**
+	 * Create a new `Option`
+	 *
+	 * If the value is null or undefined, the `Option` will have a `None` type
+	 *
+	 * @param v The value to wrap
+	 */
+	public static from<X>(v?: any): Option<X> {
+		return (isOption(v)) ? Option.from(v.unwrap()) : new Option(v);
+	}
+
+	/**
+	 * The wrapped value is not null or undefined
+	 */
+	public isSome(): boolean {
+		return isSome(this.inner);
+	}
+
+	/**
+	 * The wrapped value is null or undefined
+	 */
+	public isNone(): boolean {
+		return !this.isSome();
+	}
+
+	/**
+	 * Check if the current `Option` is `Some`. If it is,
+	 * return the value of the passed function.
+	 *
+	 * Otherwise, returns false
+	 *
+	 * @param fn A boolean check to run on the wrapped value
+	 */
+	public isSomeAnd(fn: (a: T) => boolean): boolean {
+		return isSome(this.inner) ? fn(this.inner.value) : false;
+	}
+
+	/**
+	 * Check if the current `Option` is `None`. If it is,
+	 * return the value of the passed function.
+	 *
+	 * Otherwise, return false
+	 *
+	 * @param fn A function returning a boolean value
+	 */
+	public isNoneAnd(fn: () => boolean): boolean {
+		return this.isNone() ? fn() : false;
+	}
+
+	/**
+	 * Transform the inner value of the `Option` with the passed function.
+	 * If this `Option` is `Some`, a new `Option` with the transformed value
+	 * is returned. Otherwise `None` is returned
+	 *
+	 * @param fn A function that takes the inner value of the `Option` and returns a new one
+	 */
+	public map<U>(fn: (a: T) => U): Option<U> {
+		return isSome(this.inner) ? Option.from(fn(this.inner.value)) : Option.None;
+	}
+
+	/**
+	 * If this `Option` is `Some`, return the transformed inner value via the passed function.
+	 *
+	 * Otherwise, return the passed default value
+	 *
+	 * @param def The default value to return if this `Option` is `None`
+	 * @param fn A function that takes the inner value of this `Option` and returns a new value
+	 */
+	public mapOr<U>(def: U, fn: (a: T) => U): U {
+		return isSome(this.inner) ? fn(this.inner.value) : def;
+	}
+
+	/**
+	 * If this `Option` is `Some`, return the transformed inner value via the passed function (fn).
+	 *
+	 * Otherwise run the function (def) to return a value
+	 *
+	 * @param def A function to return a value if this `Option` is `None`
+	 * @param fn A function that takes the inner value of this `Option` and returns a new value
+	 */
+	public mapOrElse<U>(def: () => U, fn: (a: T) => U): U {
+		return isSome(this.inner) ? fn(this.inner.value) : def();
+	}
+
+	/**
+	 * Return the inner value if not `None`.
+	 * Otherwise, throw a new exception with the passed message
+	 *
+	 * @param err
+	 */
+	public assert(err: string): T | never {
+		if (isSome(this.inner)) {
+			return this.inner.value;
+		}
+
+		throw Error(err);
+	}
+
+	/**
+	 * Return the inner value if is `Some<T>`.
+	 *
+	 * If `None`, throws an exception.
+	 */
+	public unwrap(): T | never {
+		return this.assert("Called unwrap on a 'None'");
+	}
+
+	/**
+	 * Return the inner value if is `Some<T>`,
+	 * Otherwise, return the passed default value
+	 *
+	 * @param def Value to return on `None` value
+	 */
+	public unwrapOr(def: T): T {
+		return isSome(this.inner) ? this.inner.value : def;
+	}
+
+	/**
+	 * Return the inner value if is `Some<T>`,
+	 * Otherwise, return the value generated by the passed function
+	 *
+	 * @param f Function to run on `None` value
+	 */
+	public unwrapOrElse(f: () => T): T {
+		return isSome(this.inner) ? this.inner.value : f();
+	}
+
+	/**
+	 * Check if this `Option` and the passed option are both `Some`,
+	 * otherwise return `None`
+	 *
+	 * @param optb Another `Option` to check
+	 */
+	public and<U>(optb: Option<U>): Option<U> {
+		return isSome(this.inner) ? optb : Option.None;
+	}
+
+	/**
+	 * Check if this `Option` is `Some`. If it is, run the passed
+	 * function with the wrapped value.
+	 *
+	 * Otherwise, return None
+	 *
+	 * @param f function to run on the wrapped value
+	 */
+	public andThen<U>(f: (a: T) => Option<U>): Option<U> {
+		return isSome(this.inner) ? f(this.inner.value) : Option.None;
+	}
+
+	/**
+	 * Check if this `Option` is `None`. If it is, return the passed option.
+	 *
+	 * @param optb The `Option` to return if this `Option` is `None`
+	 */
+	public or(optb: Option<T>): Option<T> {
+		return this.isNone() ? optb : this;
+	}
+
+	/**
+	 * Check if this `Option` is `None`. If it is, return the passed function.
+	 *
+	 * Otherwise, return this `Option`
+	 *
+	 * @param f A function to return a different `Option`
+	 */
+	public orElse(f: () => Option<T>): Option<T> {
+		return this.isNone() ? f() : this;
+	}
+
+	/**
+	 * Create a string representation of the `Option`,
+	 * mostly for debugging
+	 */
+	public toString(): string {
+		const innerValue = (isSome(this.inner))
+			? JSON.stringify(this.inner.value)
+			: '';
+		const prefix = this.inner.type.valueOf();
+
+		return (innerValue.length > 0) ? `${prefix} (${innerValue})` : prefix;
+	}
+}
+
+export const { Some, None } = Option;
+export default Option;

src/common/position.ts

@@ -4,14 +4,23 @@
 export class Position {
 	private constructor(public x: number = 0, public y: number = 0) {}
 
+	/**
+	 * Create a new `Position` at the specified location
+	 */
 	public static at(x: number, y: number): Position {
 		return new Position(x, y);
 	}
 
+	/**
+	 * Create a new `Position` from an existing one
+	 */
 	public static from(p: Position): Position {
 		return new Position(p.x, p.y);
 	}
 
+	/**
+	 * Create a new `Position` at the origin (0, 0)
+	 */
 	public static default(): Position {
 		return new Position();
 	}

src/common/row.ts

@@ -1,8 +1,22 @@
-import { SCROLL_TAB_SIZE } from './config.ts';
-import { arrayInsert, isAsciiDigit, some, strChars } from './fns.ts';
-import { highlightToColor, HighlightType } from './highlight.ts';
 import Ansi from './ansi.ts';
 
+import { SCROLL_TAB_SIZE } from './config.ts';
+import {
+	arrayInsert,
+	highlightToColor,
+	isAsciiDigit,
+	isSeparator,
+	strChars,
+	strlen,
+	substr,
+} from './fns.ts';
+import { FileType } from './filetype.ts';
+import Option, { None, Some } from './option.ts';
+import { HighlightType, SearchDirection } from './types.ts';
+
+const SINGLE_QUOTE = "'";
+const DOUBLE_QUOTE = '"';
+
 /**
  * One row of text in the current document. In order to handle
  * multi-byte graphemes, all operations are done on an
@@ -25,27 +39,47 @@ export class Row {
 	 */
 	public hl: HighlightType[] = [];
 
+	/**
+	 * Has the current row been highlighted?
+	 */
+	public isHighlighted: boolean = false;
+
 	private constructor(s: string | string[] = '') {
 		this.chars = Array.isArray(s) ? s : strChars(s);
 		this.rchars = [];
 	}
 
+	/**
+	 * Get the number of 'characters' in this row
+	 */
 	public get size(): number {
 		return this.chars.length;
 	}
 
+	/**
+	 * Get the number of 'characters' in the 'render' array
+	 */
 	public get rsize(): number {
 		return this.rchars.length;
 	}
 
+	/**
+	 * Get the 'render' string
+	 */
 	public rstring(offset: number = 0): string {
 		return this.rchars.slice(offset).join('');
 	}
 
+	/**
+	 * Create a new empty Row
+	 */
 	public static default(): Row {
 		return new Row();
 	}
 
+	/**
+	 * Create a new Row
+	 */
 	public static from(s: string | string[] | Row): Row {
 		if (s instanceof Row) {
 			return s;
@@ -54,11 +88,17 @@ export class Row {
 		return new Row(s);
 	}
 
-	public append(s: string): void {
+	/**
+	 * Add a character to the end of the current row
+	 */
+	public append(s: string, syntax: FileType): void {
 		this.chars = this.chars.concat(strChars(s));
-		this.update();
+		this.update(None, syntax);
 	}
 
+	/**
+	 * Add a character to the current row at the specified location
+	 */
 	public insertChar(at: number, c: string): void {
 		const newSlice = strChars(c);
 		if (at >= this.size) {
@@ -71,10 +111,10 @@ export class Row {
 	/**
 	 * Truncate the current row, and return a new one at the specified index
 	 */
-	public split(at: number): Row {
+	public split(at: number, syntax: FileType): Row {
 		const newRow = new Row(this.chars.slice(at));
 		this.chars = this.chars.slice(0, at);
-		this.update();
+		this.update(None, syntax);
 
 		return newRow;
 	}
@@ -92,25 +132,48 @@ export class Row {
 
 	/**
 	 * Search the current row for the specified string, and return
-	 * the index of the start of that match
+	 * the 'character' index of the start of that match
 	 */
-	public find(s: string, offset: number = 0): number | null {
+	public find(
-		const thisStr = this.toString();
+		s: string,
-		if (!this.toString().includes(s)) {
+		at: number = 0,
-			return null;
+		direction: SearchDirection = SearchDirection.Forward,
+	): Option<number> {
+		if (at > this.size) {
+			return None;
 		}
+		const thisStr = this.chars.join('');
 
-		const byteCount = thisStr.indexOf(s, this.charIndexToByteIndex(offset));
+		// Look for the search query `s`, starting from the 'character' `offset`
+		const byteIndex = (direction === SearchDirection.Forward)
+			? thisStr.indexOf(s, this.charIndexToByteIndex(at))
+			: thisStr.lastIndexOf(s, this.charIndexToByteIndex(at));
+
+		// No match after the specified offset
+		if (byteIndex < 0) {
+			return None;
+		}
 
 		// In many cases, the string length will
 		// equal the number of characters. So
 		// searching is fairly easy
 		if (thisStr.length === this.chars.length) {
-			return byteCount;
+			return Some(byteIndex);
 		}
 
 		// Emoji/Extended Unicode-friendly search
-		return this.byteIndexToCharIndex(byteCount);
+		return Some(this.byteIndexToCharIndex(byteIndex));
+	}
+
+	/**
+	 * Search the current Row for the given string, returning the index in
+	 * the 'render' version
+	 */
+	public rIndexOf(s: string, offset: number = 0): Option<number> {
+		const rstring = this.rchars.join('');
+		const byteIndex = rstring.indexOf(s, this.charIndexToByteIndex(offset));
+
+		return (byteIndex >= 0) ? Some(this.byteIndexToCharIndex(byteIndex)) : None;
 	}
 
 	/**
@@ -179,44 +242,447 @@ export class Row {
 			return charIndex;
 		}
 
+		// The char index will be the same size or smaller than
+		// the JS string index, as a 'character' can consist
+		// of multiple JS string indicies
 		return this.chars.slice(0, charIndex).reduce(
-			(prev, current) => prev += current.length,
+			(prev, current) => prev + current.length,
 			0,
 		);
 	}
 
+	/**
+	 * Output the contents of the row
+	 */
 	public toString(): string {
 		return this.chars.join('');
 	}
 
-	public update(searchMatch?: string): void {
+	/**
+	 * Setup up the row by converting tabs to spaces for rendering,
+	 * then setup syntax highlighting
+	 */
+	public update(
+		word: Option<string>,
+		syntax: FileType,
+		startWithComment: boolean = false,
+	): boolean {
 		const newString = this.chars.join('').replaceAll(
 			'\t',
 			' '.repeat(SCROLL_TAB_SIZE),
 		);
 
 		this.rchars = strChars(newString);
-		this.highlight(searchMatch);
+		return this.highlight(word, syntax, startWithComment);
 	}
 
-	public highlight(searchMatch?: string): void {
+	/**
-		const highlighting = [];
+	 * Calculate the syntax types of the current Row
-
+	 */
-		if (some(searchMatch)) {
+	public highlight(
-			// TODO: highlight search here
+		word: Option<string>,
+		syntax: FileType,
+		startWithComment: boolean,
+	): boolean {
+		// When the highlighting is already up-to-date
+		if (this.isHighlighted && word.isNone()) {
+			return false;
 		}
 
-		for (const ch of this.rchars) {
+		this.hl = [];
-			if (isAsciiDigit(ch)) {
+		let i = 0;
-				highlighting.push(HighlightType.Number);
+
-			} else {
+		// Handle the case where we are in a multi-line
-				highlighting.push(HighlightType.None);
+		// comment from a previous row
+		let inMlComment = startWithComment;
+		if (inMlComment && syntax.hasMultilineComments()) {
+			const maybeEnd = this.rIndexOf(syntax.multiLineCommentEnd.unwrap(), i);
+			const closingIndex = (maybeEnd.isSome())
+				? maybeEnd.unwrap() + 2
+				: this.rsize;
+
+			for (; i < closingIndex; i++) {
+				this.hl.push(HighlightType.MultiLineComment);
+			}
+			i = closingIndex;
+		}
+
+		for (; i < this.rsize;) {
+			const maybeMultiline = this.highlightMultilineComment(i, syntax);
+			if (maybeMultiline.isSome()) {
+				inMlComment = true;
+				i = maybeMultiline.unwrap();
+				continue;
+			}
+
+			inMlComment = false;
+
+			// Go through the syntax highlighting types in order:
+			// If there is a match, we end the chain of syntax types
+			// and 'consume' the number of characters that matched
+			const maybeNext = this.highlightComment(i, syntax)
+				.orElse(() => this.highlightPrimaryKeywords(i, syntax))
+				.orElse(() => this.highlightSecondaryKeywords(i, syntax))
+				.orElse(() => this.highlightString(i, syntax))
+				.orElse(() => this.highlightCharacter(i, syntax))
+				.orElse(() => this.highlightNumber(i, syntax))
+				.orElse(() => this.highlightOperators(i, syntax));
+
+			if (maybeNext.isNone()) {
+				this.hl.push(HighlightType.None);
+				i += 1;
+				continue;
+			}
+
+			const next = maybeNext.unwrap();
+			if (next >= this.rsize) {
+				break;
+			}
+
+			i = next;
+		}
+
+		this.highlightMatch(word);
+		if (inMlComment && syntax.hasMultilineComments()) {
+			if (
+				substr(this.toString(), this.size - 2) !==
+					syntax.multiLineCommentEnd.unwrap()
+			) {
+				return true;
+			}
+		}
+		this.isHighlighted = true;
+		return false;
+	}
+
+	protected highlightMatch(word: Option<string>): void {
+		let searchIndex = 0;
+
+		// Find matches for the current search
+		if (word.isSome()) {
+			const query = word.unwrap();
+			while (true) {
+				const match = this.find(
+					query,
+					searchIndex,
+					SearchDirection.Forward,
+				);
+				if (match.isNone()) {
+					break;
+				}
+
+				const index = match.unwrap();
+				const matchSize = strlen(query);
+				const nextPossible = index + matchSize;
+				if (nextPossible < this.rsize) {
+					let i = index;
+					for (const _ in strChars(word.unwrap())) {
+						this.hl[i] = HighlightType.Match;
+						i += 1;
+					}
+
+					searchIndex = nextPossible;
+				} else {
+					break;
+				}
+			}
+		}
+	}
+
+	protected highlightComment(
+		i: number,
+		syntax: FileType,
+	): Option<number> {
+		// Highlight single-line comments
+		if (syntax.singleLineComment.isSome()) {
+			const commentStart = syntax.singleLineComment.unwrap();
+			const hasCommentStart = this.rIndexOf(commentStart).isSome();
+			if (
+				hasCommentStart && this.rIndexOf(commentStart).unwrap() === i
+			) {
+				for (; i < this.rsize; i++) {
+					this.hl.push(HighlightType.SingleLineComment);
+				}
+
+				return Some(i);
 			}
 		}
 
-		this.hl = highlighting;
+		return None;
 	}
 
+	private highlightStr(
+		i: number,
+		substring: string,
+		hl_type: HighlightType,
+	): Option<number> {
+		if (strlen(substring) === 0) {
+			return None;
+		}
+
+		const substringChars = strChars(substring);
+		for (const [j, ch] of substringChars.entries()) {
+			const nextChar = this.rchars[i + j];
+			if (nextChar !== ch) {
+				return None;
+			}
+		}
+
+		for (const _ of substringChars) {
+			this.hl.push(hl_type);
+			i += 1;
+		}
+
+		return Some(i);
+	}
+
+	private highlightKeywords(
+		i: number,
+		keywords: string[],
+		hl_type: HighlightType,
+	): Option<number> {
+		if (i > 0) {
+			const prevChar = this.rchars[i - 1];
+			if (!isSeparator(prevChar)) {
+				return None;
+			}
+		}
+
+		for (const keyword of keywords) {
+			// Skip keywords that can't fit in the current line
+			if (i + strlen(keyword) >= this.rsize) {
+				continue;
+			}
+
+			// Check the character after the keyword
+			// if it is not a 'separator' character,
+			// we must be highlighting the middle of something else
+			const nextChar = this.rchars[i + strlen(keyword)];
+			if (!isSeparator(nextChar)) {
+				continue;
+			}
+
+			const maybeHighlight = this.highlightStr(i, keyword, hl_type);
+			if (maybeHighlight.isSome()) {
+				return maybeHighlight;
+			}
+		}
+
+		return None;
+	}
+
+	protected highlightPrimaryKeywords(
+		i: number,
+		syntax: FileType,
+	): Option<number> {
+		return this.highlightKeywords(
+			i,
+			syntax.primaryKeywords,
+			HighlightType.Keyword1,
+		);
+	}
+
+	protected highlightSecondaryKeywords(
+		i: number,
+		syntax: FileType,
+	): Option<number> {
+		return this.highlightKeywords(
+			i,
+			syntax.secondaryKeywords,
+			HighlightType.Keyword2,
+		);
+	}
+
+	protected highlightOperators(
+		i: number,
+		syntax: FileType,
+	): Option<number> {
+		// Search the list of operators
+		outer: for (const op of syntax.operators) {
+			const chars = strChars(op);
+
+			// See if this operator (chars[j]) exists at this index
+			for (const [j, ch] of chars.entries()) {
+				// Make sure the next character of this operator matches too
+				const nextChar = this.rchars[i + j];
+				if (nextChar !== ch) {
+					continue outer;
+				}
+			}
+
+			// This operator matches, highlight it
+			for (const _ of chars) {
+				this.hl.push(HighlightType.Operator);
+				i += 1;
+			}
+
+			return Some(i);
+		}
+
+		return None;
+	}
+
+	protected highlightCharacter(
+		i: number,
+		syntax: FileType,
+	): Option<number> {
+		if (!syntax.flags.characters) {
+			return None;
+		}
+
+		// Highlight character literals
+		const ch = this.rchars[i];
+		if (ch === SINGLE_QUOTE && this.rIndexOf(SINGLE_QUOTE, i + 1).isSome()) {
+			while (true) {
+				this.hl.push(HighlightType.Character);
+				i += 1;
+				if (i === this.rsize) {
+					break;
+				}
+
+				const nextChar = this.rchars[i];
+				// Make sure to continue highlighting if
+				// you have an escaped character delimeter
+				if (nextChar === '\\') {
+					this.hl.push(HighlightType.Character);
+					i += 1;
+					continue;
+				}
+				if (nextChar === ch) {
+					break;
+				}
+			}
+			this.hl.push(HighlightType.Character);
+			i += 1;
+			return Some(i);
+		}
+
+		return None;
+	}
+
+	protected highlightString(
+		i: number,
+		syntax: FileType,
+	): Option<number> {
+		if (!syntax.flags.strings) {
+			return None;
+		}
+
+		// Highlight strings
+		const ch = this.rchars[i];
+		if (
+			ch === DOUBLE_QUOTE ||
+			((!syntax.flags.characters) && ch === SINGLE_QUOTE)
+		) {
+			while (true) {
+				this.hl.push(HighlightType.String);
+				i += 1;
+				if (i === this.rsize) {
+					break;
+				}
+
+				const nextChar = this.rchars[i];
+				if (nextChar === ch) {
+					break;
+				}
+			}
+			this.hl.push(HighlightType.String);
+			i += 1;
+			return Some(i);
+		}
+
+		return None;
+	}
+
+	protected highlightMultilineComment(
+		i: number,
+		syntax: FileType,
+	): Option<number> {
+		if (!syntax.hasMultilineComments()) {
+			return None;
+		}
+
+		const ch = this.rchars[i];
+
+		const startChars = syntax.multiLineCommentStart.unwrap();
+		const endChars = syntax.multiLineCommentEnd.unwrap();
+		if (ch === startChars[0] && this.rchars[i + 1] == startChars[1]) {
+			const maybeEnd = this.rIndexOf(endChars, i);
+			const end = (maybeEnd.isSome())
+				? maybeEnd.unwrap() + strlen(endChars) + 2
+				: this.rsize;
+
+			for (; i <= end; i++) {
+				this.hl.push(HighlightType.MultiLineComment);
+			}
+			return Some(i);
+		}
+
+		return None;
+	}
+
+	protected highlightNumber(
+		i: number,
+		syntax: FileType,
+	): Option<number> {
+		// Exit early
+		const ch = this.rchars[i];
+		if (!(syntax.flags.numbers && isAsciiDigit(ch))) {
+			return None;
+		}
+
+		// Configure which characters are valid
+		// for numbers in the current FileType
+		let validChars = ['.'];
+		if (syntax.flags.binNumbers) {
+			validChars = validChars.concat(['b', 'B']);
+		}
+		if (syntax.flags.octalNumbers) {
+			validChars = validChars.concat(['o', 'O']);
+		}
+		if (syntax.flags.hexNumbers) {
+			// deno-fmt-ignore
+			validChars = validChars.concat([
+				'a','A',
+				'b','B',
+				'c','C',
+				'd','D',
+				'e','E',
+				'f','F',
+				'x','X',
+			]);
+		}
+		if (syntax.flags.jsBigInt) {
+			validChars.push('n');
+		}
+
+		// Number literals are not attached to other syntax
+		if (i > 0 && !isSeparator(this.rchars[i - 1])) {
+			return None;
+		}
+
+		// Match until the end of the number literal
+		while (true) {
+			this.hl.push(HighlightType.Number);
+			i += 1;
+			if (i >= this.rsize) {
+				break;
+			}
+
+			const nextChar = this.rchars[i];
+			if (
+				!(validChars.includes(nextChar) || isAsciiDigit(nextChar))
+			) {
+				break;
+			}
+		}
+
+		return Some(i);
+	}
+
+	/**
+	 * Return a terminal-formatted version of the current row
+	 */
 	public render(offset: number, len: number): string {
 		const end = Math.min(len, this.rsize);
 		const start = Math.min(offset, len);

src/common/runtime.ts

@@ -1,141 +1,11 @@
-import process from 'node:process';
+export * from './runtime/file_io.ts';
-import { IRuntime, ITestBase } from './types.ts';
+export * from './runtime/helpers.ts';
-import { noop } from './fns.ts';
+export * from './runtime/log.ts';
-import { SCROLL_ERR_FILE, SCROLL_LOG_FILE } from './config.ts';
+export * from './runtime/node.ts';
+export * from './runtime/runtime.ts';
+export * from './runtime/terminal_io.ts';
+export * from './runtime/test_base.ts';
+export { RunTimeType } from './types.ts';
 
-export type { IFileIO, IRuntime, ITerminal } from './types.ts';
+import { CommonRuntime } from './runtime/runtime.ts';
-
+export default CommonRuntime;
-/**
- * Which Typescript runtime is currently being used
- */
-export enum RunTimeType {
-	Bun = 'bun',
-	Deno = 'deno',
-	Unknown = 'common',
-}
-
-export enum LogLevel {
-	Debug = 'Debug',
-	Info = 'Info',
-	Notice = 'Notice',
-	Warning = 'Warning',
-	Error = 'Error',
-}
-
-let scrollRuntime: IRuntime | null = null;
-
-// ----------------------------------------------------------------------------
-// Misc runtime functions
-// ----------------------------------------------------------------------------
-
-export function log(s: unknown, level: LogLevel = LogLevel.Notice): void {
-	getRuntime().then(({ file }) => {
-		const raw = JSON.stringify(s, null, 2);
-		const output = `${level}: ${raw}\n`;
-
-		const outputFile = (level === LogLevel.Error)
-			? SCROLL_ERR_FILE
-			: SCROLL_LOG_FILE;
-		file.appendFile(outputFile, output).then(noop);
-	});
-}
-
-/**
- * Append information to the scroll.err logfile
- */
-export function logError(s: unknown): void {
-	log(s, LogLevel.Error);
-}
-
-/**
- * Kill program, displaying an error message
- * @param s
- */
-export function die(s: string | Error): void {
-	logError(s);
-	process.stdin.setRawMode(false);
-	console.error(s);
-	getRuntime().then((r) => r.exit());
-}
-
-/**
- * Determine which Typescript runtime we are operating under
- */
-export function runtimeType(): RunTimeType {
-	let runtime = RunTimeType.Unknown;
-
-	if ('Deno' in globalThis) {
-		runtime = RunTimeType.Deno;
-	}
-	if ('Bun' in globalThis) {
-		runtime = RunTimeType.Bun;
-	}
-
-	return runtime;
-}
-
-/**
- * Get the adapter object for the current Runtime
- */
-export async function getRuntime(): Promise<IRuntime> {
-	if (scrollRuntime === null) {
-		const runtime = runtimeType();
-		const path = `../${runtime}/mod.ts`;
-
-		const pkg = await import(path);
-		if ('default' in pkg) {
-			scrollRuntime = pkg.default;
-		}
-
-		if (scrollRuntime !== null) {
-			return Promise.resolve(scrollRuntime);
-		}
-
-		return Promise.reject('Missing default import');
-	}
-
-	return Promise.resolve(scrollRuntime);
-}
-
-/**
- * Get the common test interface object
- */
-export async function getTestRunner(): Promise<ITestBase> {
-	const runtime = runtimeType();
-	const path = `../${runtime}/test_base.ts`;
-	const pkg = await import(path);
-	if ('default' in pkg) {
-		return pkg.default;
-	}
-
-	return pkg;
-}
-
-/**
- * Import a runtime-specific module
- *
- * e.g. to load "src/bun/mod.ts", if the runtime is bun,
- * you can use like so `await importForRuntime('index')`;
- *
- * @param path - the path within the runtime module
- */
-export const importForRuntime = async (path: string) => {
-	const runtime = runtimeType();
-	const suffix = '.ts';
-	const base = `../${runtime}/`;
-
-	const pathParts = path
-		.split('/')
-		.filter((part) => part !== '' && part !== '.' && part !== suffix)
-		.map((part) => part.replace(suffix, ''));
-
-	const cleanedPath = pathParts.join('/');
-	const importPath = base + cleanedPath + suffix;
-
-	const pkg = await import(importPath);
-	if ('default' in pkg) {
-		return pkg.default;
-	}
-
-	return pkg;
-};

src/common/runtime/file_io.ts

@@ -0,0 +1,28 @@
+import { appendFile, readFile, writeFile } from 'node:fs/promises';
+import { resolve } from 'node:path';
+
+import { IFileIO } from './runtime.ts';
+
+/**
+ * File IO implementation using shared node APIs
+ */
+export const CommonFileIO: IFileIO = {
+	openFile: async function (path: string): Promise<string> {
+		const filePath = resolve(path);
+		const contents = await readFile(filePath, { encoding: 'utf8' });
+
+		return contents;
+	},
+	appendFile: async function (path: string, contents: string): Promise<void> {
+		const filePath = resolve(path);
+
+		await appendFile(filePath, contents);
+	},
+	saveFile: async function (path: string, contents: string): Promise<void> {
+		const filePath = resolve(path);
+
+		await writeFile(filePath, contents);
+	},
+};
+
+export default CommonFileIO;

src/common/runtime/helpers.ts

@@ -0,0 +1,82 @@
+/**
+ * Functions/Methods that depend on the current runtime to function
+ */
+import { logError, logWarning } from './log.ts';
+import { node_path as path, node_process as process } from './node.ts';
+import { IRuntime } from './runtime.ts';
+import { ITestBase } from './test_base.ts';
+import { RunTimeType } from '../types.ts';
+
+let scrollRuntime: IRuntime | null = null;
+
+/**
+ * Kill program, displaying an error message
+ * @param s
+ */
+export function die(s: string | Error): void {
+	logError(s);
+	process.stdin.setRawMode(false);
+	console.error(s);
+	getRuntime().then((r) => r.exit());
+}
+
+/**
+ * Determine which Typescript runtime we are operating under
+ */
+export function runtimeType(): RunTimeType {
+	const cmd = path.basename(process.argv[0]);
+	switch (cmd) {
+		case 'deno':
+			return RunTimeType.Deno;
+
+		case 'bun':
+			return RunTimeType.Bun;
+
+		case 'node':
+			return RunTimeType.Tsx;
+
+		default:
+			logWarning('Fallback runtime detection', { cmd });
+			if ('bun' in globalThis) {
+				return RunTimeType.Bun;
+			}
+			return RunTimeType.Tsx;
+	}
+}
+
+/**
+ * Get the adapter object for the current Runtime
+ */
+export async function getRuntime(): Promise<IRuntime> {
+	if (scrollRuntime === null) {
+		const runtime = runtimeType();
+		const path = `../../${runtime}/mod.ts`;
+
+		const pkg = await import(path);
+		if ('default' in pkg) {
+			scrollRuntime = pkg.default;
+		}
+
+		if (scrollRuntime !== null) {
+			return Promise.resolve(scrollRuntime);
+		}
+
+		return Promise.reject('Missing default import');
+	}
+
+	return Promise.resolve(scrollRuntime);
+}
+
+/**
+ * Get the common test interface object
+ */
+export async function getTestRunner(): Promise<ITestBase> {
+	const runtime = runtimeType();
+	const path = `../../${runtime}/test_base.ts`;
+	const pkg = await import(path);
+	if ('default' in pkg) {
+		return pkg.default;
+	}
+
+	return pkg;
+}

src/common/runtime/log.ts

@@ -0,0 +1,68 @@
+import { noop } from '../fns.ts';
+import { SCROLL_LOG_FILE_PREFIX, SCROLL_LOG_FILE_SUFFIX } from '../config.ts';
+import { getRuntime } from './helpers.ts';
+
+/**
+ * The label for type/severity of the log entry
+ */
+export enum LogLevel {
+	Debug = 'Debug',
+	Info = 'Info',
+	Notice = 'Notice',
+	Warning = 'Warning',
+	Error = 'Error',
+}
+
+/**
+ * Basic logging
+ *
+ * @param s The string or data to display first
+ * @param level The log severity
+ * @param data Any additional data to display with the log entry
+ */
+export function log(
+	s: unknown,
+	level: LogLevel = LogLevel.Notice,
+	data?: any,
+): void {
+	getRuntime().then(({ file }) => {
+		const rawS = JSON.stringify(s, null, 2);
+		const rawData = JSON.stringify(data, null, 2);
+		const output = (typeof data !== 'undefined')
+			? `${rawS}\n${rawData}\n\n`
+			: `${rawS}\n`;
+
+		const outputFile =
+			`${SCROLL_LOG_FILE_PREFIX}-${level.toLowerCase()}${SCROLL_LOG_FILE_SUFFIX}`;
+		file.appendFile(outputFile, output).then(noop);
+	});
+}
+
+/**
+ * Make a log entry of `LogLevel.Debug` severity
+ */
+export const logDebug = (s: unknown, data?: any) =>
+	log(s, LogLevel.Debug, data);
+
+/**
+ * Make a log entry of `LogLevel.Info` severity
+ */
+export const logInfo = (s: unknown, data?: any) => log(s, LogLevel.Info, data);
+
+/**
+ * Make a log entry of `LogLevel.Notice` severity
+ */
+export const logNotice = (s: unknown, data?: any) =>
+	log(s, LogLevel.Notice, data);
+
+/**
+ * Make a log entry of `LogLevel.Warning` severity
+ */
+export const logWarning = (s: unknown, data?: any) =>
+	log(s, LogLevel.Warning, data);
+
+/**
+ * Make a log entry of `LogLevel.Error` severity
+ */
+export const logError = (s: unknown, data?: any) =>
+	log(s, LogLevel.Warning, data);

src/common/runtime/node.ts

@@ -0,0 +1,9 @@
+/**
+ * Re-export of node apis shared by runtimes
+ */
+import node_assert from 'node:assert';
+import node_path from 'node:path';
+import node_process from 'node:process';
+import node_tty from 'node:tty';
+
+export { node_assert, node_path, node_process, node_tty };

src/common/runtime/runtime.ts

@@ -0,0 +1,139 @@
+import { node_process as process } from './node.ts';
+import CommonFileIO from './file_io.ts';
+import CommonTerminalIO from './terminal_io.ts';
+import { RunTimeType } from '../types.ts';
+
+// ----------------------------------------------------------------------------
+// Runtime adapter interfaces
+// ----------------------------------------------------------------------------
+
+/**
+ * The size of terminal in rows and columns
+ */
+export interface ITerminalSize {
+	rows: number;
+	cols: number;
+}
+
+/**
+ * Runtime-specific terminal functionality
+ */
+export interface ITerminal {
+	/**
+	 * The arguments passed to the program on launch
+	 */
+	argv: string[];
+
+	/**
+	 * The generator function returning chunks of input from the stdin stream
+	 */
+	inputLoop(): AsyncGenerator<Uint8Array, null>;
+
+	/**
+	 * Get the size of the terminal
+	 */
+	getTerminalSize(): Promise<ITerminalSize>;
+
+	/**
+	 * Get the current chunk of input, if it exists
+	 */
+	readStdin(): Promise<string | null>;
+
+	/**
+	 * Get the raw chunk of input
+	 */
+	readStdinRaw(): Promise<Uint8Array | null>;
+
+	/**
+	 * Pipe a string to stdout
+	 */
+	writeStdout(s: string): Promise<void>;
+}
+
+/**
+ * Runtime-specific file system io
+ */
+export interface IFileIO {
+	/**
+	 * Open an entire file
+	 *
+	 * @param path
+	 */
+	openFile(path: string): Promise<string>;
+
+	/**
+	 * Append to a file, or create it if it doesn't exist
+	 *
+	 * @param path
+	 * @param contents
+	 */
+	appendFile(path: string, contents: string): Promise<void>;
+
+	/**
+	 * Save a string into a file
+	 *
+	 * @param path
+	 * @param contents
+	 */
+	saveFile(path: string, contents: string): Promise<void>;
+}
+
+/**
+ * The common interface for runtime adapters
+ */
+export interface IRuntime {
+	/**
+	 * The name of the runtime
+	 */
+	name: RunTimeType;
+
+	/**
+	 * Runtime-specific terminal functionality
+	 */
+	term: ITerminal;
+
+	/**
+	 * Runtime-specific file system io
+	 */
+	file: IFileIO;
+
+	/**
+	 * Set up an event handler
+	 *
+	 * @param eventName - The event to listen for
+	 * @param handler - The event handler
+	 */
+	onEvent: (
+		eventName: string,
+		handler: (e: Event | ErrorEvent) => void,
+	) => void;
+
+	/**
+	 * Set a beforeExit/beforeUnload event handler for the runtime
+	 * @param cb - The event handler
+	 */
+	onExit(cb: () => void): void;
+
+	/**
+	 * Stop execution
+	 *
+	 * @param code
+	 */
+	exit(code?: number): void;
+}
+
+/**
+ * Base runtime using shared Node APIs
+ */
+export const CommonRuntime: IRuntime = {
+	name: RunTimeType.Unknown,
+	term: CommonTerminalIO,
+	file: CommonFileIO,
+	onEvent: (eventName: string, handler) => process.on(eventName, handler),
+	onExit: (cb: () => void): void => {
+		process.on('beforeExit', cb);
+		process.on('exit', cb);
+		process.on('SIGINT', cb);
+	},
+	exit: (code?: number) => process.exit(code),
+};

src/common/runtime/terminal_io.ts

@@ -0,0 +1,44 @@
+import { node_process as process } from './node.ts';
+import { readKey } from '../fns.ts';
+import { ITerminal, ITerminalSize } from '../types.ts';
+
+/**
+ * Terminal IO using shared Node APIs
+ */
+export const CommonTerminalIO: ITerminal = {
+	argv: (process.argv.length > 2) ? process.argv.slice(2) : [],
+	inputLoop: async function* (): AsyncGenerator<Uint8Array, null> {
+		yield (await CommonTerminalIO.readStdinRaw()) ?? new Uint8Array(0);
+
+		return null;
+	},
+	getTerminalSize: function getTerminalSize(): Promise<ITerminalSize> {
+		const [cols, rows] = process.stdout.getWindowSize();
+
+		return Promise.resolve({
+			rows,
+			cols,
+		});
+	},
+	readStdin: async function (): Promise<string | null> {
+		const raw = await CommonTerminalIO.readStdinRaw();
+		return readKey(raw ?? new Uint8Array(0));
+	},
+	readStdinRaw: function (): Promise<Uint8Array | null> {
+		return new Promise((resolve) => {
+			process.stdin.resume().once(
+				'data',
+				(buffer: Uint8Array) => {
+					process.stdin.pause();
+					resolve(buffer);
+				},
+			);
+		});
+	},
+	writeStdout: function (s: string): Promise<void> {
+		process.stdout.write(s);
+		return Promise.resolve();
+	},
+};
+
+export default CommonTerminalIO;

src/common/runtime/test_base.ts

@@ -0,0 +1,95 @@
+/**
+ * Adapt the node test interface to the shared testing interface
+ */
+import { deepStrictEqual, notStrictEqual, strictEqual } from 'node:assert';
+import Option from '../option.ts';
+
+/**
+ * The shared interface for tests, running on a different test
+ * runner for each runtime
+ */
+export interface ITestBase {
+	assertEquivalent(actual: unknown, expected: unknown): void;
+	assertExists(actual: unknown): void;
+	assertInstanceOf(actual: unknown, expectedType: any): void;
+	assertNotEquals(actual: unknown, expected: unknown): void;
+	assertEquals(actual: unknown, expected: unknown): void;
+	assertTrue(actual: boolean): void;
+	assertFalse(actual: boolean): void;
+	assertSome<T>(actual: Option<T>): void;
+	assertNone<T>(actual: Option<T>): void;
+	/**
+	 * Convert the nested test object into a test suite for the current runtime
+	 */
+	testSuite(testObj: any): void;
+}
+
+/**
+ * The base testing implementation using Node assert API
+ */
+export abstract class AbstractTestBase implements Partial<ITestBase> {
+	/**
+	 * The values (often objects) have all the same property values
+	 */
+	public static assertEquivalent(actual: unknown, expected: unknown): void {
+		return deepStrictEqual(actual, expected);
+	}
+
+	/**
+	 * The value is not null or undefined
+	 */
+	public static assertExists(actual: unknown): void {
+		return notStrictEqual(actual, undefined);
+	}
+
+	/**
+	 * `actual` is an object implementing `expectedType`
+	 */
+	public static assertInstanceOf(actual: unknown, expectedType: any): void {
+		return strictEqual(actual instanceof expectedType, true);
+	}
+
+	/**
+	 * The values are not exactly equal (Different instance, type, value, etc)
+	 */
+	public static assertNotEquals(actual: unknown, expected: unknown): void {
+		return notStrictEqual(actual, expected);
+	}
+
+	/**
+	 * The values are exactly the same
+	 */
+	public static assertEquals(actual: unknown, expected: unknown): void {
+		return strictEqual(actual, expected);
+	}
+
+	/**
+	 * The value is true
+	 */
+	public static assertTrue(actual: boolean): void {
+		return strictEqual(actual, true);
+	}
+
+	/**
+	 * The value is false
+	 */
+	public static assertFalse(actual: boolean): void {
+		return strictEqual(actual, false);
+	}
+
+	/**
+	 * The value is a `Some` type `Option`
+	 */
+	public static assertSome<T>(actual: Option<T>): void {
+		return AbstractTestBase.assertTrue(actual.isSome());
+	}
+
+	/**
+	 * The value is a `None` type `Option`
+	 */
+	public static assertNone<T>(actual: Option<T>): void {
+		return AbstractTestBase.assertTrue(actual.isNone());
+	}
+}
+
+export default AbstractTestBase;

src/common/search.ts

@@ -1,76 +0,0 @@
-import { Position } from './types.ts';
-import { KeyCommand } from './ansi.ts';
-import Document from './document.ts';
-
-enum SearchDirection {
-	Forward = 1,
-	Backward = -1,
-}
-
-export class Search {
-	private lastMatch: number = -1;
-	private current: number = -1;
-	private direction: SearchDirection = SearchDirection.Forward;
-	public parent: Document | null = null;
-
-	private parseInput(key: string) {
-		switch (key) {
-			case KeyCommand.ArrowRight:
-			case KeyCommand.ArrowDown:
-				this.direction = SearchDirection.Forward;
-				break;
-
-			case KeyCommand.ArrowLeft:
-			case KeyCommand.ArrowUp:
-				this.direction = SearchDirection.Backward;
-				break;
-
-			default:
-				this.lastMatch = -1;
-				this.direction = SearchDirection.Forward;
-		}
-
-		if (this.lastMatch === -1) {
-			this.direction = SearchDirection.Forward;
-		}
-
-		this.current = this.lastMatch;
-	}
-
-	private getNextRow(rowCount: number): number {
-		this.current += this.direction;
-		if (this.current === -1) {
-			this.current = rowCount - 1;
-		} else if (this.current === rowCount) {
-			this.current = 0;
-		}
-
-		return this.current;
-	}
-
-	public search(q: string, key: string): Position | null {
-		if (this.parent === null) {
-			return null;
-		}
-
-		this.parseInput(key);
-
-		let i = 0;
-		for (; i < this.parent.numRows; i++) {
-			const current = this.getNextRow(this.parent.numRows);
-			const row = this.parent.row(current);
-
-			if (row === null) {
-				continue;
-			}
-
-			const possible = row.find(q);
-			if (possible !== null) {
-				this.lastMatch = current;
-				return Position.at(possible, current);
-			}
-		}
-
-		return null;
-	}
-}

src/common/types.ts

@@ -1,122 +1,47 @@
-import { RunTimeType } from './runtime.ts';
-
 export { Position } from './position.ts';
+export type { ITestBase } from './runtime/test_base.ts';
+export type { IFileIO, IRuntime, ITerminal, ITerminalSize } from './runtime.ts';
 
 /**
- * The size of terminal in rows and columns
+ * Which Typescript runtime is currently being used
  */
-export interface ITerminalSize {
+export enum RunTimeType {
-	rows: number;
+	Bun = 'bun',
-	cols: number;
+	Deno = 'deno',
-}
+	Tsx = 'tsx',
-
+	Unknown = 'unknown',
-// ----------------------------------------------------------------------------
-// Runtime adapter interfaces
-// ----------------------------------------------------------------------------
-
-/**
- * The common interface for runtime adapters
- */
-export interface IRuntime {
-	/**
-	 * The name of the runtime
-	 */
-	name: RunTimeType;
-
-	/**
-	 * Runtime-specific terminal functionality
-	 */
-	term: {
-		/**
-		 * The arguments passed to the program on launch
-		 */
-		argv: string[];
-
-		/**
-		 * The generator function returning chunks of input from the stdin stream
-		 */
-		inputLoop(): AsyncGenerator<Uint8Array, null>;
-
-		/**
-		 * Get the size of the terminal
-		 */
-		getTerminalSize(): Promise<ITerminalSize>;
-
-		/**
-		 * Get the current chunk of input, if it exists
-		 */
-		readStdin(): Promise<string | null>;
-
-		/**
-		 * Get the raw chunk of input
-		 */
-		readStdinRaw(): Promise<Uint8Array | null>;
-
-		/**
-		 * Pipe a string to stdout
-		 */
-		writeStdout(s: string): Promise<void>;
-	};
-
-	/**
-	 * Runtime-specific file system io
-	 */
-	file: {
-		openFile(path: string): Promise<string>;
-		appendFile(path: string, contents: string): Promise<void>;
-		saveFile(path: string, contents: string): Promise<void>;
-	};
-
-	/**
-	 * Set up an event handler
-	 *
-	 * @param eventName - The event to listen for
-	 * @param handler - The event handler
-	 */
-	onEvent: (
-		eventName: string,
-		handler: (e: Event | ErrorEvent) => void,
-	) => void;
-
-	/**
-	 * Set a beforeExit/beforeUnload event handler for the runtime
-	 * @param cb - The event handler
-	 */
-	onExit(cb: () => void): void;
-
-	/**
-	 * Stop execution
-	 *
-	 * @param code
-	 */
-	exit(code?: number): void;
 }
 
 /**
- * Runtime-specific terminal functionality
+ * The type of Syntax being highlighted
  */
-export type ITerminal = IRuntime['term'];
+export enum HighlightType {
-
+	/** No highlighting */
-/**
+	None,
- * Runtime-specific file handling
+	/** Number literals */
- */
+	Number,
-export type IFileIO = IRuntime['file'];
+	/** Search results */
-
+	Match,
-// ----------------------------------------------------------------------------
+	/** Character literals */
-// Testing
+	Character,
-// ----------------------------------------------------------------------------
+	/** String literals */
-
+	String,
-/**
+	/** Single line comments */
- * The shared test interface, so tests can be run by both runtimes
+	SingleLineComment,
- */
+	/** Multi-line comments */
-export interface ITestBase {
+	MultiLineComment,
-	assertEquals(actual: unknown, expected: unknown): void;
+	/** Primary keywords */
-	assertExists(actual: unknown): void;
+	Keyword1,
-	assertFalse(actual: boolean): void;
+	/** Secondary keywords */
-	assertInstanceOf(actual: unknown, expectedType: any): void;
+	Keyword2,
-	assertNotEquals(actual: unknown, expected: unknown): void;
+	/** Math/logic operators */
-	assertNull(actual: unknown): void;
+	Operator,
-	assertStrictEquals(actual: unknown, expected: unknown): void;
+}
-	assertTrue(actual: boolean): void;
+
-	testSuite(testObj: any): void;
+/**
+ * Which direction to search in the current document
+ */
+export enum SearchDirection {
+	Forward = 1,
+	Backward = -1,
 }

src/deno/deps.ts

@@ -1 +0,0 @@
-export * as stdAssert from 'https://deno.land/std@0.208.0/assert/mod.ts';

src/deno/file_io.ts

@@ -1,7 +1,3 @@
-if (!('Deno' in globalThis)) {
-	throw new Error('This module requires Deno to run');
-}
-
 import { IFileIO } from '../common/runtime.ts';
 
 const DenoFileIO: IFileIO = {

src/deno/mod.ts

@@ -1,16 +1,15 @@
-if (!('Deno' in globalThis)) {
-	throw new Error('This module requires Deno to run');
-}
 /**
  * The main entrypoint when using Deno as the runtime
  */
-import { IRuntime, RunTimeType } from '../common/runtime.ts';
+import { CommonRuntime, IRuntime, RunTimeType } from '../common/runtime.ts';
 import DenoTerminalIO from './terminal_io.ts';
 import DenoFileIO from './file_io.ts';
 
-import * as node_process from 'node:process';
+/**
-
+ * The Deno Runtime implementation
+ */
 const DenoRuntime: IRuntime = {
+	...CommonRuntime,
 	name: RunTimeType.Deno,
 	file: DenoFileIO,
 	term: DenoTerminalIO,
@@ -20,7 +19,6 @@ const DenoRuntime: IRuntime = {
 		globalThis.addEventListener('onbeforeunload', cb);
 		globalThis.onbeforeunload = cb;
 	},
-	exit: (code?: number) => node_process.exit(code),
 };
 
 export default DenoRuntime;

src/deno/terminal_io.ts

@@ -1,6 +1,3 @@
-if (!('Deno' in globalThis)) {
-	throw new Error('This module requires Deno to run');
-}
 import { readKey } from '../common/fns.ts';
 import { ITerminal, ITerminalSize } from '../common/types.ts';
 

src/deno/test_base.ts

@@ -1,48 +1,15 @@
-if (!('Deno' in globalThis)) {
+// @ts-ignore The import exists, but tsc complains
-	throw new Error('This module requires Deno to run');
+import { test } from 'node:test';
-}
+import AbstractTestBase from '../common/runtime/test_base.ts';
-import { ITestBase } from '../common/types.ts';
+class DenoTestBase extends AbstractTestBase {
-import { stdAssert } from './deps.ts';
+	public static testSuite(testObj: any) {
-const {
+		Object.keys(testObj).forEach((group) => {
-	assertEquals,
+			const groupObj = testObj[group];
-	assertExists,
+			Object.keys(groupObj).forEach((testName) => {
-	assertInstanceOf,
+				test(testName, groupObj[testName]);
-	AssertionError,
+			});
-	assertNotEquals,
-	assertStrictEquals,
-} = stdAssert;
-
-export function testSuite(testObj: any) {
-	Object.keys(testObj).forEach((group) => {
-		const groupObj = testObj[group];
-		Object.keys(groupObj).forEach((testName) => {
-			Deno.test(testName, groupObj[testName]);
 		});
-	});
+	}
 }
 
-const DenoTestBase: ITestBase = {
-	assertEquals,
-	assertExists,
-	assertInstanceOf,
-	assertNotEquals,
-	assertStrictEquals,
-	assertTrue: function (actual: boolean): void {
-		if (actual !== true) {
-			throw new AssertionError(`actual: "${actual}" expected to be true"`);
-		}
-	},
-	assertFalse(actual: boolean): void {
-		if (actual !== false) {
-			throw new AssertionError(`actual: "${actual}" expected to be false"`);
-		}
-	},
-	assertNull(actual: boolean): void {
-		if (actual !== null) {
-			throw new AssertionError(`actual: "${actual}" expected to be null"`);
-		}
-	},
-	testSuite,
-};
-
 export default DenoTestBase;

src/tsx/mod.ts

@@ -0,0 +1,14 @@
+/**
+ * The main entrypoint when using Tsx as the runtime
+ */
+import { CommonRuntime, IRuntime, RunTimeType } from '../common/runtime.ts';
+
+/**
+ * The Tsx Runtime implementation
+ */
+const TsxRuntime: IRuntime = {
+	...CommonRuntime,
+	name: RunTimeType.Tsx,
+};
+
+export default TsxRuntime;

src/tsx/test_base.ts

@@ -0,0 +1,21 @@
+/**
+ * Adapt the node test interface to the shared testing interface
+ */
+// @ts-ignore The import exists, but tsc complains
+import { describe, it } from 'node:test';
+import AbstractTestBase from '../common/runtime/test_base.ts';
+
+class TsxTestBase extends AbstractTestBase {
+	public static testSuite(testObj: any): void {
+		Object.keys(testObj).forEach((group) => {
+			describe(group, () => {
+				const groupObj = testObj[group];
+				Object.keys(groupObj).forEach((testName) => {
+					it(testName, groupObj[testName]);
+				});
+			});
+		});
+	}
+}
+
+export default TsxTestBase;

tsconfig.json

@@ -10,10 +10,14 @@
 		"noEmit": true,
 		"strict": true,
 		"forceConsistentCasingInFileNames": true,
+		"noImplicitAny": true,
 		"skipLibCheck": true,
 		"composite": true,
 		"downlevelIteration": true,
-		"allowSyntheticDefaultImports": true
+		"esModuleInterop": true,
+		"allowSyntheticDefaultImports": true,
+		"isolatedModules": true,
+		"strictNullChecks": true
 	},
 	"exclude": ["src/deno"]
 }