58 lines
1.7 KiB
TypeScript
58 lines
1.7 KiB
TypeScript
// Copyright: Ankitects Pty Ltd and contributors
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// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
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import { mathIcon } from "./icons";
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const parser = new DOMParser();
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function getStyle(nightMode: boolean, fontSize: number): HTMLStyleElement {
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const style = document.createElement("style") as HTMLStyleElement;
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const color = nightMode ? "white" : "black";
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/* color is set for Maths, fill for the empty icon */
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const css = `svg { color: ${color}; fill: ${color}; font-size: ${fontSize}px; }`;
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style.appendChild(document.createTextNode(css));
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return style;
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}
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function getEmptyIcon(nightMode: boolean, fontSize: number): [string, string] {
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const style = getStyle(nightMode, fontSize);
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const icon = parser.parseFromString(mathIcon, "image/svg+xml");
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const svg = icon.children[0];
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svg.insertBefore(style, svg.children[0]);
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return [svg.outerHTML, ""];
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}
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export function convertMathjax(
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input: string,
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nightMode: boolean,
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fontSize: number
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): [string, string] {
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if (input.trim().length === 0) {
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return getEmptyIcon(nightMode, fontSize);
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}
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const output = globalThis.MathJax.tex2svg(input);
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const svg = output.children[0];
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if (svg.viewBox.baseVal.height === 16) {
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return getEmptyIcon(nightMode, fontSize);
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}
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let title = "";
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if (svg.innerHTML.includes("data-mjx-error")) {
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svg.querySelector("rect").setAttribute("fill", "yellow");
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svg.querySelector("text").setAttribute("color", "red");
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title = svg.querySelector("title").innerHTML;
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} else {
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const style = getStyle(nightMode, fontSize);
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svg.insertBefore(style, svg.children[0]);
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}
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return [svg.outerHTML, title];
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}
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