@ryanatkn/fuz

json

json html strings

{
	"string": "a string",
	"number": 12345,
	"boolean": true,
	"null": null,
	"empty": "",
	"escaped": "quote: \"test\" and backslash: \\",
	"object": {
		"array": [1, "b", false],
		"strings": ["1", "2", "3"],
		"mixed": ["start", 123, true, "middle", null, "end"],
		"nested": [["a", "str", ""], {"key": "nested value"}]
	}
}

json highlighted ranges

{
	"string": "a string",
	"number": 12345,
	"boolean": true,
	"null": null,
	"empty": "",
	"escaped": "quote: \"test\" and backslash: \\",
	"object": {
		"array": [1, "b", false],
		"strings": ["1", "2", "3"],
		"mixed": ["start", 123, true, "middle", null, "end"],
		"nested": [["a", "str", ""], {"key": "nested value"}]
	}
}

css

css html strings

.some_class {
	color: red;
}

.hypen-class {
	font-size: 16px;
}

p {
	box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

/* comment */

/*
multi
.line {
	i: 100px

</style>

@media*/

#id {
	background-color: blue;
}

div > p {
	margin: 10px;
}

@media (max-width: 600px) {
	body {
		background-color: light-dark(lightblue, darkblue);
	}
}

.content::before {
	/* prettier-ignore */
	content: "</style> /* not a comment */";
}

.attr[title='Click: here'] {
	background-image: url('data:image/svg+xml...');
}

css highlighted ranges

.some_class {
	color: red;
}

.hypen-class {
	font-size: 16px;
}

p {
	box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

/* comment */

/*
multi
.line {
	i: 100px

</style>

@media*/

#id {
	background-color: blue;
}

div > p {
	margin: 10px;
}

@media (max-width: 600px) {
	body {
		background-color: light-dark(lightblue, darkblue);
	}
}

.content::before {
	/* prettier-ignore */
	content: "</style> /* not a comment */";
}

.attr[title='Click: here'] {
	background-image: url('data:image/svg+xml...');
}

ts

ts html strings

const a = 1;

const b: string = 'b';

const c = true;

export type Some_Type = 1 | 'b' | true;

declare const some_decorator: any;

abstract class Base {
	abstract abstract_method(): void;
}

/* eslint-disable no-console */

@some_decorator
class D extends Base {
	readonly d1: string = 'd';
	d2: number;
	d3 = $state(null);

	@some_decorator
	decorated = true;

	constructor(d2: number) {
		super();
		this.d2 = d2;
	}

	abstract_method(): void {
		// implementation
	}

	@some_decorator('example', {option: true})
	class_method(): string {
		return `Hello, ${this.d1}`;
	}

	instance_method = (): void => {
		/* ... */
		let i = 0;
		do {
			i++;
		} while (i < 3);

		for (const c2 of this.d1) {
			if (c2 === 'd') continue;
			if (!c2) break;
			this.#private_method(a, c2);
		}

		switch (this.d1) {
			case 'a':
				console.log('case a');
				break;
			case 'b':
			case 'c':
				console.log('case b or c');
				break;
			default:
				console.log('default');
		}

		const obj: {has_d1?: boolean; is_d: boolean} = {
			has_d1: 'd1' in this,
			is_d: this instanceof D,
		};
		delete obj.has_d1;
		// foo
	};

	#private_method(a2: number, c2: any): void {
		throw new Error(`${this.d1}
			multiline
			etc ${a2 + c2}
		`);
	}

	*generator(): Generator<number | Array<number>> {
		yield 1;
		yield* [2, 3];
	}

	async *async_generator(): AsyncGenerator<number> {
		yield await Promise.resolve(4);
	}

	protected async protected_method(): Promise<void> {
		try {
			await new Promise((resolve) => setTimeout(resolve, 100));
			if (Math.random() > 0.5) {
				console.log(new Date());
			} else if (Math.random() > 0.2) {
				console.log('else if branch');
			} else {
				console.log('else branch');
			}
		} catch (error: unknown) {
			console.error(error);
		} finally {
			console.log('finally block');
		}
	}
}

// comment

/*
other comment

const comment = false;
*/

/**
 * JSDoc comment
 */

import {sample_langs, type Sample_Lang} from '../code_sample.js';
import * as A from '../code_sample.js';

export {a, A, b, c, D};

sample_langs as unknown as Sample_Lang satisfies Sample_Lang;

export interface Some_E<T = null> {
	name: string;
	age: number;
	t?: T;
}

const e: {name: string; age: number} = {name: 'A. H.', age: 100};
const v = [['', e]] as const;
export const some_e: Map<string, Some_E> = new Map(v);

export function add(x: number, y: number): number {
	return x + y;
}

export const plus = (a: any, b: any): any => a + b;

// boundary test cases
export const str_with_keywords = 'const class function string';
export const str_with_comment = '// this is not a comment';
export const template_with_expr = `Value: ${1 + 2}`;

// regex that looks like comment
export const regex = /\/\/.*/g;
export const complex_regex = /^(?:\/\*.*?\*\/|\/\/.*|[^/])+$/;

// string in comment should not be highlighted as string
// const commented = "this string is in a comment";

ts highlighted ranges

const a = 1;

const b: string = 'b';

const c = true;

export type Some_Type = 1 | 'b' | true;

declare const some_decorator: any;

abstract class Base {
	abstract abstract_method(): void;
}

/* eslint-disable no-console */

@some_decorator
class D extends Base {
	readonly d1: string = 'd';
	d2: number;
	d3 = $state(null);

	@some_decorator
	decorated = true;

	constructor(d2: number) {
		super();
		this.d2 = d2;
	}

	abstract_method(): void {
		// implementation
	}

	@some_decorator('example', {option: true})
	class_method(): string {
		return `Hello, ${this.d1}`;
	}

	instance_method = (): void => {
		/* ... */
		let i = 0;
		do {
			i++;
		} while (i < 3);

		for (const c2 of this.d1) {
			if (c2 === 'd') continue;
			if (!c2) break;
			this.#private_method(a, c2);
		}

		switch (this.d1) {
			case 'a':
				console.log('case a');
				break;
			case 'b':
			case 'c':
				console.log('case b or c');
				break;
			default:
				console.log('default');
		}

		const obj: {has_d1?: boolean; is_d: boolean} = {
			has_d1: 'd1' in this,
			is_d: this instanceof D,
		};
		delete obj.has_d1;
		// foo
	};

	#private_method(a2: number, c2: any): void {
		throw new Error(`${this.d1}
			multiline
			etc ${a2 + c2}
		`);
	}

	*generator(): Generator<number | Array<number>> {
		yield 1;
		yield* [2, 3];
	}

	async *async_generator(): AsyncGenerator<number> {
		yield await Promise.resolve(4);
	}

	protected async protected_method(): Promise<void> {
		try {
			await new Promise((resolve) => setTimeout(resolve, 100));
			if (Math.random() > 0.5) {
				console.log(new Date());
			} else if (Math.random() > 0.2) {
				console.log('else if branch');
			} else {
				console.log('else branch');
			}
		} catch (error: unknown) {
			console.error(error);
		} finally {
			console.log('finally block');
		}
	}
}

// comment

/*
other comment

const comment = false;
*/

/**
 * JSDoc comment
 */

import {sample_langs, type Sample_Lang} from '../code_sample.js';
import * as A from '../code_sample.js';

export {a, A, b, c, D};

sample_langs as unknown as Sample_Lang satisfies Sample_Lang;

export interface Some_E<T = null> {
	name: string;
	age: number;
	t?: T;
}

const e: {name: string; age: number} = {name: 'A. H.', age: 100};
const v = [['', e]] as const;
export const some_e: Map<string, Some_E> = new Map(v);

export function add(x: number, y: number): number {
	return x + y;
}

export const plus = (a: any, b: any): any => a + b;

// boundary test cases
export const str_with_keywords = 'const class function string';
export const str_with_comment = '// this is not a comment';
export const template_with_expr = `Value: ${1 + 2}`;

// regex that looks like comment
export const regex = /\/\/.*/g;
export const complex_regex = /^(?:\/\*.*?\*\/|\/\/.*|[^/])+$/;

// string in comment should not be highlighted as string
// const commented = "this string is in a comment";

html

html html strings

<!doctype html>

<div class="test">
	<p>hello world!</p>
</div>

<p class="some_class hypen-class">some <span class="a b c">text</span></p>

<button type="button" disabled>click me</button>

<!-- comment <div>a<br /> b</div> <script> -->

<br />

<hr onclick="console.log('hi')" />

<img src="image.jpg" alt="access" />

<ul>
	<li>list item 1</li>
	<li>list item 2</li>
</ul>

<form action="/submit" method="post">
	<input type="text" name="username" placeholder="Enter name" />
	<select name="option" data-role="dropdown">
		<option value="1">First</option>
		<option value="2">Second</option>
	</select>
</form>

<script>
	const ok = '<style>';
</script>

<style type="text/css">
	.special::before {
		content: '< & >';
	}
</style>

<![CDATA[ if (a < 0) alert("b"); <not-a-tag> ]]>

html highlighted ranges

<!doctype html>

<div class="test">
	<p>hello world!</p>
</div>

<p class="some_class hypen-class">some <span class="a b c">text</span></p>

<button type="button" disabled>click me</button>

<!-- comment <div>a<br /> b</div> <script> -->

<br />

<hr onclick="console.log('hi')" />

<img src="image.jpg" alt="access" />

<ul>
	<li>list item 1</li>
	<li>list item 2</li>
</ul>

<form action="/submit" method="post">
	<input type="text" name="username" placeholder="Enter name" />
	<select name="option" data-role="dropdown">
		<option value="1">First</option>
		<option value="2">Second</option>
	</select>
</form>

<script>
	const ok = '<style>';
</script>

<style type="text/css">
	.special::before {
		content: '< & >';
	}
</style>

<![CDATA[ if (a < 0) alert("b"); <not-a-tag> ]]>

svelte

svelte html strings

<script lang="ts" module>
	export const HELLO = 'world';
</script>

<script lang="ts">
	// @ts-expect-error
	import Thing from '$lib/Thing.svelte';
	import type {Snippet} from 'svelte';

	const {
		thing,
		bound = $bindable(true),
		children,
		onclick,
	}: {
		thing: Record<string, any>;
		bound?: boolean;
		children: Snippet;
		onclick?: () => void;
	} = $props();

	const thing_keys = $derived(Object.entries(thing));

	const a = 1 as number;

	const b = 'b';

	let c: boolean = $state(true);

	const f = (p: any) => p;

	const attachment = (_p1: string, _p2: number) => {
		return (el: HTMLElement) => {
			element_ref !== el;
		};
	};

	let value = $state(thing['']);
	let element_ref: HTMLElement;
</script>

<h1 bind:this={element_ref}>hello {HELLO}!</h1>

{#each thing_keys as [k, { t, u }] (f(k))}
	{@const v = Math.round(t[k + f(u)])}
	{f(v)}
{/each}

{#if f(c)}
	<Thing string_prop="a {f('s')} b" number_prop={f(1)} />
{:else if f(a > 0)}
	bigger
{:else}
	<Thing string_prop="b" onthing={() => (c = f(!c))}>
		{@render children()}
	</Thing>
{/if}

<!-- eslint-disable-next-line svelte/no-at-html-tags -->
{@html '<strong>raw html</strong>'}

<input bind:value type="text" class:active={c} />

<span {@attach attachment('param', f(42))}>...</span>

{@render my_snippet('p')}

{#snippet my_snippet(p: string)}
	<button type="button" {onclick}>{p}</button>
{/snippet}

<p class="some_class hypen-class" id="unique_id">
	some <span class="a b c">text</span>
</p>

<button type="button" disabled> click me </button>

<!-- comment <div>a<br /> {b}</div> -->
{b.repeat(2)}
{bound}

<br />

<hr />

<img src="image.jpg" alt="access" />

<ul>
	<li>list item 1</li>
	<li>list item 2</li>
</ul>

<!-- embedded tags for boundary testing -->
<div>
	<script>
		const inline_js = 'no lang attr';
	</script>
	<style>
		.inline {
			color: blue;
		}
	</style>
</div>

<style>
	.some_class {
		color: red;
	}

	.hypen-class {
		font-size: 16px;
	}

	p {
		box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
	}

	/* comment */

	/*
	multi
	line

	<comment>

	*/

	#unique_id {
		background-color: blue;
	}

	@media (max-width: 600px) {
		:global(body) {
			background-color: light-dark(lightblue, darkblue);
		}
	}

	:global(.escapehatch)::before {
		content: '< & >';
	}
</style>

svelte highlighted ranges

<script lang="ts" module>
	export const HELLO = 'world';
</script>

<script lang="ts">
	// @ts-expect-error
	import Thing from '$lib/Thing.svelte';
	import type {Snippet} from 'svelte';

	const {
		thing,
		bound = $bindable(true),
		children,
		onclick,
	}: {
		thing: Record<string, any>;
		bound?: boolean;
		children: Snippet;
		onclick?: () => void;
	} = $props();

	const thing_keys = $derived(Object.entries(thing));

	const a = 1 as number;

	const b = 'b';

	let c: boolean = $state(true);

	const f = (p: any) => p;

	const attachment = (_p1: string, _p2: number) => {
		return (el: HTMLElement) => {
			element_ref !== el;
		};
	};

	let value = $state(thing['']);
	let element_ref: HTMLElement;
</script>

<h1 bind:this={element_ref}>hello {HELLO}!</h1>

{#each thing_keys as [k, { t, u }] (f(k))}
	{@const v = Math.round(t[k + f(u)])}
	{f(v)}
{/each}

{#if f(c)}
	<Thing string_prop="a {f('s')} b" number_prop={f(1)} />
{:else if f(a > 0)}
	bigger
{:else}
	<Thing string_prop="b" onthing={() => (c = f(!c))}>
		{@render children()}
	</Thing>
{/if}

<!-- eslint-disable-next-line svelte/no-at-html-tags -->
{@html '<strong>raw html</strong>'}

<input bind:value type="text" class:active={c} />

<span {@attach attachment('param', f(42))}>...</span>

{@render my_snippet('p')}

{#snippet my_snippet(p: string)}
	<button type="button" {onclick}>{p}</button>
{/snippet}

<p class="some_class hypen-class" id="unique_id">
	some <span class="a b c">text</span>
</p>

<button type="button" disabled> click me </button>

<!-- comment <div>a<br /> {b}</div> -->
{b.repeat(2)}
{bound}

<br />

<hr />

<img src="image.jpg" alt="access" />

<ul>
	<li>list item 1</li>
	<li>list item 2</li>
</ul>

<!-- embedded tags for boundary testing -->
<div>
	<script>
		const inline_js = 'no lang attr';
	</script>
	<style>
		.inline {
			color: blue;
		}
	</style>
</div>

<style>
	.some_class {
		color: red;
	}

	.hypen-class {
		font-size: 16px;
	}

	p {
		box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
	}

	/* comment */

	/*
	multi
	line

	<comment>

	*/

	#unique_id {
		background-color: blue;
	}

	@media (max-width: 600px) {
		:global(body) {
			background-color: light-dark(lightblue, darkblue);
		}
	}

	:global(.escapehatch)::before {
		content: '< & >';
	}
</style>

md

md html strings

# Heading 1

## Heading 2

### Heading 3

#### Heading 4

##### Heading 5

###### Heading 6

## Inline formatting

This is **bold text** and this is also __bold text__.

This is _italic text_ and this is also *italic text*.

This is ~~strikethrough text~~.

This is `inline code` with backticks.

This is a [link to example](https://example.com) in text.

## Lists

- list item 1
- list item 2
- list item 3

* alternative list item 1
* alternative list item 2
  - indented list item 1
  - indented list item 2
    - Deeply nested item

  - after a newline

## Blockquotes

> This is a blockquote.
> It can span multiple lines.

> Another blockquote with **bold** and _italic_.

## Fenced Code Blocks

### TypeScript

```ts
function add(a: number, b: number): number {
	return a + b;
}
```

#### TypeScript with alias 'typescript'

```typescript
interface User {
	name: string;
	age: number;
}

const user: User = {name: 'Alice', age: 30};
```

### JS

```js
function add(a, b) {
	return a + b;
}
```

#### JS with alias 'javascript'

```javascript
const fifteen = multiply(5, 3);
```

### CSS

```css
.container {
	display: flex;
	font-size: 14px;
}
```

### HTML

```html
<!doctype html>
<div class="test">
	<p>hello world!</p>
</div>

<button type="button" disabled>click me</button>

<!-- comment -->
```

#### HTML with alias 'markup'

```markup
<ul>
	<li>a</li>
	<li>b</li>
</ul>
```

### JSON

```json
{
	"key": "value",
	"array": [1, 2, 3, true, false, null]
}
```

### Svelte

```svelte
<script lang="ts">
	let count: number = $state(0);
	const increment = () => count++;
</script>

<button type="button" onclick={increment}>
	Count: {count}
</button>

<style>
	button {
		padding: 8px 16px;
	}
</style>
```

### Unknown Language

```python
def hello(name):
    print(f"Hello, {name}!")

hello("world")
```

## Edge Cases

**bold** and **bold** in the same line.

_italic_ and _italic_ in the same line.

**bold** with _italic_ and ~~strikethrough~~ all mixed.

`code`, **bold**, _italic_ + [a link](https://example.com).

Not bold: ** spaces around **, ** spaces around **.

Not italic: _ spaces around _, _ spaces around _.

Not code: `
multiline`.

```

Empty fence above.

```unknownlang
Plain text for unknown language.
const variable = 2;
```

Nested fences (3 to 5):

`````md
with `five` fences
````md
with `four` fences
```html
<style>
	body { color: red; }
</style>
```
ending `four`
````
another `four`
````ts
const a = '5';
````
ending `five`
`````

## HTML Support

Since Markdown extends HTML, raw HTML is also styled:

<div class="container">
	<p>This HTML is <strong>styled</strong> correctly!</p>
</div>

HTML can wrap code blocks:

<div>

```ts
const example = 'embedded code';
```

</div>

md highlighted ranges

# Heading 1

## Heading 2

### Heading 3

#### Heading 4

##### Heading 5

###### Heading 6

## Inline formatting

This is **bold text** and this is also __bold text__.

This is _italic text_ and this is also *italic text*.

This is ~~strikethrough text~~.

This is `inline code` with backticks.

This is a [link to example](https://example.com) in text.

## Lists

- list item 1
- list item 2
- list item 3

* alternative list item 1
* alternative list item 2
  - indented list item 1
  - indented list item 2
    - Deeply nested item

  - after a newline

## Blockquotes

> This is a blockquote.
> It can span multiple lines.

> Another blockquote with **bold** and _italic_.

## Fenced Code Blocks

### TypeScript

```ts
function add(a: number, b: number): number {
	return a + b;
}
```

#### TypeScript with alias 'typescript'

```typescript
interface User {
	name: string;
	age: number;
}

const user: User = {name: 'Alice', age: 30};
```

### JS

```js
function add(a, b) {
	return a + b;
}
```

#### JS with alias 'javascript'

```javascript
const fifteen = multiply(5, 3);
```

### CSS

```css
.container {
	display: flex;
	font-size: 14px;
}
```

### HTML

```html
<!doctype html>
<div class="test">
	<p>hello world!</p>
</div>

<button type="button" disabled>click me</button>

<!-- comment -->
```

#### HTML with alias 'markup'

```markup
<ul>
	<li>a</li>
	<li>b</li>
</ul>
```

### JSON

```json
{
	"key": "value",
	"array": [1, 2, 3, true, false, null]
}
```

### Svelte

```svelte
<script lang="ts">
	let count: number = $state(0);
	const increment = () => count++;
</script>

<button type="button" onclick={increment}>
	Count: {count}
</button>

<style>
	button {
		padding: 8px 16px;
	}
</style>
```

### Unknown Language

```python
def hello(name):
    print(f"Hello, {name}!")

hello("world")
```

## Edge Cases

**bold** and **bold** in the same line.

_italic_ and _italic_ in the same line.

**bold** with _italic_ and ~~strikethrough~~ all mixed.

`code`, **bold**, _italic_ + [a link](https://example.com).

Not bold: ** spaces around **, ** spaces around **.

Not italic: _ spaces around _, _ spaces around _.

Not code: `
multiline`.

```

Empty fence above.

```unknownlang
Plain text for unknown language.
const variable = 2;
```

Nested fences (3 to 5):

`````md
with `five` fences
````md
with `four` fences
```html
<style>
	body { color: red; }
</style>
```
ending `four`
````
another `four`
````ts
const a = '5';
````
ending `five`
`````

## HTML Support

Since Markdown extends HTML, raw HTML is also styled:

<div class="container">
	<p>This HTML is <strong>styled</strong> correctly!</p>
</div>

HTML can wrap code blocks:

<div>

```ts
const example = 'embedded code';
```

</div>