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<script lang="ts">
import { afterUpdate, onMount } from "svelte";
import DOMPurify from "isomorphic-dompurify";
import render_math_in_element from "katex/contrib/auto-render";
import "katex/dist/katex.min.css";
import { create_marked } from "./utils";
import "./prism.css";
export let chatbot = true;
export let message: string;
export let sanitize_html = true;
export let latex_delimiters: {
left: string;
right: string;
display: boolean;
}[] = [];
export let render_markdown = true;
export let line_breaks = true;
export let header_links = false;
export let root: string;
let el: HTMLSpanElement;
let html: string;
const marked = create_marked({
header_links,
line_breaks,
latex_delimiters
});
const is_external_url = (link: string | null): boolean => {
try {
return !!link && new URL(link).origin !== new URL(root).origin;
} catch (e) {
return false;
}
};
DOMPurify.addHook("afterSanitizeAttributes", function (node) {
if ("target" in node) {
if (is_external_url(node.getAttribute("href"))) {
node.setAttribute("target", "_blank");
node.setAttribute("rel", "noopener noreferrer");
}
}
});
function escapeRegExp(string: string): string {
return string.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
}
function process_message(value: string): string {
let parsedValue = value;
if (render_markdown) {
const latexBlocks: string[] = [];
latex_delimiters.forEach((delimiter, index) => {
const leftDelimiter = escapeRegExp(delimiter.left);
const rightDelimiter = escapeRegExp(delimiter.right);
const regex = new RegExp(
`${leftDelimiter}([\\s\\S]+?)${rightDelimiter}`,
"g"
);
parsedValue = parsedValue.replace(regex, (match, p1) => {
latexBlocks.push(match);
return `%%%LATEX_BLOCK_${latexBlocks.length - 1}%%%`;
});
});
parsedValue = marked.parse(parsedValue) as string;
parsedValue = parsedValue.replace(
/%%%LATEX_BLOCK_(\d+)%%%/g,
(match, p1) => latexBlocks[parseInt(p1, 10)]
);
}
if (sanitize_html) {
parsedValue = DOMPurify.sanitize(parsedValue);
}
return parsedValue;
}
$: if (message && message.trim()) {
html = process_message(message);
} else {
html = "";
}
async function render_html(value: string): Promise<void> {
if (latex_delimiters.length > 0 && value) {
const containsDelimiter = latex_delimiters.some(
(delimiter) =>
value.includes(delimiter.left) && value.includes(delimiter.right)
);
if (containsDelimiter) {
render_math_in_element(el, {
delimiters: latex_delimiters,
throwOnError: false
});
}
}
}
afterUpdate(async () => {
if (el && document.body.contains(el)) {
await render_html(message);
} else {
console.error("Element is not in the DOM");
}
});
</script>
<span class:chatbot bind:this={el} class="md" class:prose={render_markdown}>
{@html html}
</span>
<style>
span :global(div[class*="code_wrap"]) {
position: relative;
}
/* KaTeX */
span :global(span.katex) {
font-size: var(--text-lg);
direction: ltr;
}
span :global(div[class*="code_wrap"] > button) {
position: absolute;
top: var(--spacing-sm);
right: var(--spacing-sm);
z-index: 1;
cursor: pointer;
border-bottom-left-radius: var(--radius-sm);
padding: 5px;
padding: var(--spacing-md);
width: 25px;
height: 25px;
}
span :global(code > button > span) {
position: absolute;
top: var(--spacing-sm);
right: var(--spacing-sm);
width: 12px;
height: 12px;
}
span :global(.check) {
position: absolute;
top: 0;
right: 0;
opacity: 0;
z-index: var(--layer-top);
transition: opacity 0.2s;
background: var(--background-fill-primary);
padding: var(--size-1);
width: 100%;
height: 100%;
color: var(--body-text-color);
}
span :global(p:not(:first-child)) {
margin-top: var(--spacing-xxl);
}
span :global(.md-header-anchor) {
/* position: absolute; */
margin-left: -25px;
padding-right: 8px;
line-height: 1;
color: var(--body-text-color-subdued);
opacity: 0;
}
span :global(h1:hover .md-header-anchor),
span :global(h2:hover .md-header-anchor),
span :global(h3:hover .md-header-anchor),
span :global(h4:hover .md-header-anchor),
span :global(h5:hover .md-header-anchor),
span :global(h6:hover .md-header-anchor) {
opacity: 1;
}
span.md :global(.md-header-anchor > svg) {
color: var(--body-text-color-subdued);
}
</style>
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