src/lib/components/chat/Messages/CodeBlock.svelte

<script lang="ts">
	import hljs from 'highlight.js';
	import { loadPyodide } from 'pyodide';
	import mermaid from 'mermaid';

	import { v4 as uuidv4 } from 'uuid';

	import { getContext, getAllContexts, onMount, tick, createEventDispatcher } from 'svelte';
	import { copyToClipboard } from '$lib/utils';

	import 'highlight.js/styles/github-dark.min.css';

	import PyodideWorker from '$lib/workers/pyodide.worker?worker';
	import CodeEditor from '$lib/components/common/CodeEditor.svelte';
	import SvgPanZoom from '$lib/components/common/SVGPanZoom.svelte';

	const i18n = getContext('i18n');
	const dispatch = createEventDispatcher();

	export let id = '';
	export let save = false;

	export let token;
	export let lang = '';
	export let code = '';

	let _code = '';
	$: if (code) {
		updateCode();
	}

	const updateCode = () => {
		_code = code;
	};

	let _token = null;

	let mermaidHtml = null;

	let highlightedCode = null;
	let executing = false;

	let stdout = null;
	let stderr = null;
	let result = null;

	let copied = false;
	let saved = false;

	const saveCode = () => {
		saved = true;

		code = _code;
		dispatch('save', code);

		setTimeout(() => {
			saved = false;
		}, 1000);
	};

	const copyCode = async () => {
		copied = true;
		await copyToClipboard(code);

		setTimeout(() => {
			copied = false;
		}, 1000);
	};

	const checkPythonCode = (str) => {
		// Check if the string contains typical Python syntax characters
		const pythonSyntax = [
			'def ',
			'else:',
			'elif ',
			'try:',
			'except:',
			'finally:',
			'yield ',
			'lambda ',
			'assert ',
			'nonlocal ',
			'del ',
			'True',
			'False',
			'None',
			' and ',
			' or ',
			' not ',
			' in ',
			' is ',
			' with '
		];

		for (let syntax of pythonSyntax) {
			if (str.includes(syntax)) {
				return true;
			}
		}

		// If none of the above conditions met, it's probably not Python code
		return false;
	};

	const executePython = async (code) => {
		if (!code.includes('input') && !code.includes('matplotlib')) {
			executePythonAsWorker(code);
		} else {
			result = null;
			stdout = null;
			stderr = null;

			executing = true;

			document.pyodideMplTarget = document.getElementById(`plt-canvas-${id}`);

			let pyodide = await loadPyodide({
				indexURL: '/pyodide/',
				stdout: (text) => {
					console.log('Python output:', text);

					if (stdout) {
						stdout += `${text}\n`;
					} else {
						stdout = `${text}\n`;
					}
				},
				stderr: (text) => {
					console.log('An error occured:', text);
					if (stderr) {
						stderr += `${text}\n`;
					} else {
						stderr = `${text}\n`;
					}
				},
				packages: ['micropip']
			});

			try {
				const micropip = pyodide.pyimport('micropip');

				// await micropip.set_index_urls('https://pypi.org/pypi/{package_name}/json');

				let packages = [
					code.includes('requests') ? 'requests' : null,
					code.includes('bs4') ? 'beautifulsoup4' : null,
					code.includes('numpy') ? 'numpy' : null,
					code.includes('pandas') ? 'pandas' : null,
					code.includes('matplotlib') ? 'matplotlib' : null,
					code.includes('sklearn') ? 'scikit-learn' : null,
					code.includes('scipy') ? 'scipy' : null,
					code.includes('re') ? 'regex' : null,
					code.includes('seaborn') ? 'seaborn' : null
				].filter(Boolean);

				console.log(packages);
				await micropip.install(packages);

				result = await pyodide.runPythonAsync(`from js import prompt
def input(p):
    return prompt(p)
__builtins__.input = input`);

				result = await pyodide.runPython(code);

				if (!result) {
					result = '[NO OUTPUT]';
				}

				console.log(result);
				console.log(stdout);
				console.log(stderr);

				const pltCanvasElement = document.getElementById(`plt-canvas-${id}`);

				if (pltCanvasElement?.innerHTML !== '') {
					pltCanvasElement.classList.add('pt-4');
				}
			} catch (error) {
				console.error('Error:', error);
				stderr = error;
			}

			executing = false;
		}
	};

	const executePythonAsWorker = async (code) => {
		result = null;
		stdout = null;
		stderr = null;

		executing = true;

		let packages = [
			code.includes('requests') ? 'requests' : null,
			code.includes('bs4') ? 'beautifulsoup4' : null,
			code.includes('numpy') ? 'numpy' : null,
			code.includes('pandas') ? 'pandas' : null,
			code.includes('sklearn') ? 'scikit-learn' : null,
			code.includes('scipy') ? 'scipy' : null,
			code.includes('re') ? 'regex' : null,
			code.includes('seaborn') ? 'seaborn' : null
		].filter(Boolean);

		console.log(packages);

		const pyodideWorker = new PyodideWorker();

		pyodideWorker.postMessage({
			id: id,
			code: code,
			packages: packages
		});

		setTimeout(() => {
			if (executing) {
				executing = false;
				stderr = 'Execution Time Limit Exceeded';
				pyodideWorker.terminate();
			}
		}, 60000);

		pyodideWorker.onmessage = (event) => {
			console.log('pyodideWorker.onmessage', event);
			const { id, ...data } = event.data;

			console.log(id, data);

			data['stdout'] && (stdout = data['stdout']);
			data['stderr'] && (stderr = data['stderr']);
			data['result'] && (result = data['result']);

			executing = false;
		};

		pyodideWorker.onerror = (event) => {
			console.log('pyodideWorker.onerror', event);
			executing = false;
		};
	};

	let debounceTimeout;

	const drawMermaidDiagram = async () => {
		try {
			if (await mermaid.parse(code)) {
				const { svg } = await mermaid.render(`mermaid-${uuidv4()}`, code);
				mermaidHtml = svg;
			}
		} catch (error) {
			console.log('Error:', error);
		}
	};

	const render = async () => {
		if (lang === 'mermaid' && (token?.raw ?? '').slice(-4).includes('```')) {
			(async () => {
				await drawMermaidDiagram();
			})();
		}
	};

	$: if (token) {
		if (JSON.stringify(token) !== JSON.stringify(_token)) {
			_token = token;
		}
	}

	$: if (_token) {
		render();
	}

	$: dispatch('code', { lang, code });

	onMount(async () => {
		console.log('codeblock', lang, code);

		if (lang) {
			dispatch('code', { lang, code });
		}
		if (document.documentElement.classList.contains('dark')) {
			mermaid.initialize({
				startOnLoad: true,
				theme: 'dark',
				securityLevel: 'loose'
			});
		} else {
			mermaid.initialize({
				startOnLoad: true,
				theme: 'default',
				securityLevel: 'loose'
			});
		}
	});
</script>

<div>
	<div class="relative my-2 flex flex-col rounded-lg" dir="ltr">
		{#if lang === 'mermaid'}
			{#if mermaidHtml}
				<SvgPanZoom
					className=" border border-gray-50 dark:border-gray-850 rounded-lg max-h-fit overflow-hidden"
					svg={mermaidHtml}
				/>
			{:else}
				<pre class="mermaid">{code}</pre>
			{/if}
		{:else}
			<div class="text-text-300 absolute pl-4 py-1.5 text-xs font-medium dark:text-white">
				{lang}
			</div>

			<div
				class="sticky top-8 mb-1 py-1 pr-2.5 flex items-center justify-end z-10 text-xs text-black dark:text-white"
			>
				<div class="flex items-center gap-0.5 translate-y-[1px]">
					{#if lang.toLowerCase() === 'python' || lang.toLowerCase() === 'py' || (lang === '' && checkPythonCode(code))}
						{#if executing}
							<div class="run-code-button bg-none border-none p-1 cursor-not-allowed">Running</div>
						{:else}
							<button
								class="run-code-button bg-none border-none bg-gray-50 hover:bg-gray-100 dark:bg-gray-850 dark:hover:bg-gray-800 transition rounded-md px-1.5 py-0.5"
								on:click={async () => {
									code = _code;
									await tick();
									executePython(code);
								}}>{$i18n.t('Run')}</button
							>
						{/if}
					{/if}

					{#if save}
						<button
							class="save-code-button bg-none border-none bg-gray-50 hover:bg-gray-100 dark:bg-gray-850 dark:hover:bg-gray-800 transition rounded-md px-1.5 py-0.5"
							on:click={saveCode}
						>
							{saved ? $i18n.t('Saved') : $i18n.t('Save')}
						</button>
					{/if}

					<button
						class="copy-code-button bg-none border-none bg-gray-50 hover:bg-gray-100 dark:bg-gray-850 dark:hover:bg-gray-800 transition rounded-md px-1.5 py-0.5"
						on:click={copyCode}>{copied ? $i18n.t('Copied') : $i18n.t('Copy')}</button
					>
				</div>
			</div>

			<div
				class="language-{lang} rounded-t-lg -mt-8 {executing || stdout || stderr || result
					? ''
					: 'rounded-b-lg'} overflow-hidden"
			>
				<div class=" pt-7 bg-gray-50 dark:bg-gray-850"></div>
				<CodeEditor
					value={code}
					{id}
					{lang}
					on:save={() => {
						saveCode();
					}}
					on:change={(e) => {
						_code = e.detail.value;
					}}
				/>
			</div>

			<div
				id="plt-canvas-{id}"
				class="bg-[#202123] text-white max-w-full overflow-x-auto scrollbar-hidden"
			/>

			{#if executing}
				<div class="bg-[#202123] text-white px-4 py-4 rounded-b-lg">
					<div class=" text-gray-500 text-xs mb-1">STDOUT/STDERR</div>
					<div class="text-sm">Running...</div>
				</div>
			{:else if stdout || stderr || result}
				<div class="bg-[#202123] text-white px-4 py-4 rounded-b-lg">
					<div class=" text-gray-500 text-xs mb-1">STDOUT/STDERR</div>
					<div class="text-sm">{stdout || stderr || result}</div>
				</div>
			{/if}
		{/if}
	</div>
</div>