70 lines
1.8 KiB
TypeScript
70 lines
1.8 KiB
TypeScript
import { Plugin, loadMathJax, finishRenderMath, renderMath } from 'obsidian';
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function convertLink(link : HTMLElement) {
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const linkText = link.textContent?.trim();
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if (linkText?.contains('$')) {
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// Each section of text between unescaped $ signs
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// Fallback to empty list if null, as this happens when input is empty
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const sections = mathSplit(linkText);
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let isMath = false;
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link.innerText = '';
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for (let i = 0; i < sections.length; i++) {
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if (isMath) {
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link.createSpan().replaceWith(renderMath(sections[i], false));
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} else {
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link.createSpan().innerText += sections[i];
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}
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isMath = !isMath;
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}
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finishRenderMath();
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}
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}
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// Splits at math delimeters, handling escapes properly
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// Returns an array of alternating normal text and math text
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function mathSplit(input : string) : string[] {
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let output = [''];
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let backslashes = 0;
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for (let i = 0; i < input.length; i++) {
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let curr = input[i];
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if (curr == '\\') {
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backslashes++;
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}
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else {
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for (let j = 0; j < Math.ceil(backslashes / 2); j++) {
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output[output.length - 1] = output[output.length - 1] + "\\";
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}
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if (curr == '$' && backslashes % 2 == 0) {
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output.push('');
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}
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else {
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output[output.length - 1] = output[output.length - 1] + curr;
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}
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backslashes = 0;
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}
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}
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return output;
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}
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export default class MathJaxWikiLinks extends Plugin {
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async onload() {
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await loadMathJax();
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this.registerMarkdownPostProcessor((element, context) => {
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element.querySelectorAll('.internal-link').forEach(convertLink);
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});
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}
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}
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