90 lines
2.8 KiB
JavaScript
90 lines
2.8 KiB
JavaScript
import katex from 'katex';
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import extensionSvc from '../services/extensionSvc';
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function texMath(state, silent) {
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let startMathPos = state.pos;
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if (state.src.charCodeAt(startMathPos) !== 0x24 /* $ */) {
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return false;
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}
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// Parse tex math according to http://pandoc.org/README.html#math
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let endMarker = '$';
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startMathPos += 1;
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const afterStartMarker = state.src.charCodeAt(startMathPos);
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if (afterStartMarker === 0x24 /* $ */) {
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endMarker = '$$';
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startMathPos += 1;
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if (state.src.charCodeAt(startMathPos) === 0x24 /* $ */) {
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// 3 markers are too much
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return false;
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}
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} else if (
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// Skip if opening $ is succeeded by a space character
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afterStartMarker === 0x20 /* space */
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|| afterStartMarker === 0x09 /* \t */
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|| afterStartMarker === 0x0a /* \n */
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) {
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return false;
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}
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const endMarkerPos = state.src.indexOf(endMarker, startMathPos);
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if (endMarkerPos === -1) {
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return false;
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}
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if (state.src.charCodeAt(endMarkerPos - 1) === 0x5C /* \ */) {
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return false;
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}
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const nextPos = endMarkerPos + endMarker.length;
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if (endMarker.length === 1) {
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// Skip if $ is preceded by a space character
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const beforeEndMarker = state.src.charCodeAt(endMarkerPos - 1);
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if (beforeEndMarker === 0x20 /* space */
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|| beforeEndMarker === 0x09 /* \t */
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|| beforeEndMarker === 0x0a /* \n */) {
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return false;
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}
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// Skip if closing $ is succeeded by a digit (eg $5 $10 ...)
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const suffix = state.src.charCodeAt(nextPos);
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if (suffix >= 0x30 && suffix < 0x3A) {
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return false;
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}
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}
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if (!silent) {
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const token = state.push(endMarker.length === 1 ? 'inline_math' : 'display_math', '', 0);
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token.content = state.src.slice(startMathPos, endMarkerPos);
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}
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state.pos = nextPos;
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return true;
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}
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extensionSvc.onGetOptions((options, properties) => {
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options.math = properties.extensions.katex.enabled;
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});
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extensionSvc.onInitConverter(2, (markdown, options) => {
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if (options.math) {
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markdown.use((md) => {
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md.inline.ruler.push('texMath', texMath);
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});
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markdown.renderer.rules.inline_math = (tokens, idx) =>
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`<span class="katex--inline">${markdown.utils.escapeHtml(tokens[idx].content)}</span>`;
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markdown.renderer.rules.display_math = (tokens, idx) =>
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`<span class="katex--display">${markdown.utils.escapeHtml(tokens[idx].content)}</span>`;
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}
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});
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extensionSvc.onSectionPreview((elt) => {
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const highlighter = displayMode => (katexElt) => {
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if (!katexElt.highlighted) {
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try {
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katex.render(katexElt.textContent, katexElt, { displayMode });
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} catch (e) {
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katexElt.textContent = `${e.message}`;
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}
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}
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katexElt.highlighted = true;
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};
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elt.querySelectorAll('.katex--inline').cl_each(highlighter(false));
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elt.querySelectorAll('.katex--display').cl_each(highlighter(true));
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});
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