67 lines
1.9 KiB
TypeScript
67 lines
1.9 KiB
TypeScript
import katex from 'katex';
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const delimiters = [
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{ left: '\\\$\\\$', right: '\\\$\\\$', multiline: true },
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{ left: '\\\$', right: '\\\$', multiline: false },
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{ left: '\\\\\[', right: '\\\\\]', multiline: true },
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{ left: '\\\\\(', right: '\\\\\)', multiline: false },
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];
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const delimiterMatchers = delimiters.map(
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(delimiter) => new RegExp(
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`${delimiter.left}(.*?)${delimiter.right}`,
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`g${delimiter.multiline ? 'ms' : ''}`
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)
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);
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// Replace LaTeX delimiters in a string with KaTeX rendering
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function render(text: string): string {
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// Step 1: Replace all LaTeX expressions with placeholders
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const expressions: Array<{ placeholder: string; latex: string; displayMode: boolean }> = [];
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let modifiedText = text;
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let placeholderIndex = 0;
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// Process each delimiter type
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delimiters.forEach((delimiter, i) => {
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// Find all matches and replace with placeholders
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modifiedText = modifiedText.replace(delimiterMatchers[i], (match, latex) => {
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if (!latex.trim()) {
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return match; // Return original if content is empty
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}
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const placeholder = `__KATEX_PLACEHOLDER_${placeholderIndex++}__`;
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expressions.push({
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placeholder,
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latex,
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displayMode: delimiter.multiline,
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});
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return placeholder;
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});
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});
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// Step 2: Replace placeholders with rendered LaTeX
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for (const { placeholder, latex, displayMode } of expressions) {
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try {
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const rendered = katex.renderToString(latex, {
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throwOnError: false,
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displayMode,
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});
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modifiedText = modifiedText.replace(placeholder, rendered);
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} catch (error) {
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console.error('KaTeX rendering error:', error);
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// Replace placeholder with original LaTeX if rendering fails
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modifiedText = modifiedText.replace(
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placeholder,
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displayMode ? `$$${latex}$$` : `$${latex}$`
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);
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}
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}
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return modifiedText;
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}
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export default {
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render,
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};
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