106 lines
3.6 KiB
JavaScript
106 lines
3.6 KiB
JavaScript
// Set these to how you want inline and display math to be delimited.
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var defaultCopyDelimiters = {
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inline: ['$', '$'],
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// alternative: ['\(', '\)']
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display: ['$$', '$$'] // alternative: ['\[', '\]']
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}; // Replace .katex elements with their TeX source (<annotation> element).
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// Modifies fragment in-place. Useful for writing your own 'copy' handler,
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// as in copy-tex.js.
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function katexReplaceWithTex(fragment, copyDelimiters) {
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if (copyDelimiters === void 0) {
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copyDelimiters = defaultCopyDelimiters;
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}
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// Remove .katex-html blocks that are preceded by .katex-mathml blocks
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// (which will get replaced below).
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var katexHtml = fragment.querySelectorAll('.katex-mathml + .katex-html');
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for (var i = 0; i < katexHtml.length; i++) {
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var element = katexHtml[i];
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if (element.remove) {
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element.remove();
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} else if (element.parentNode) {
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element.parentNode.removeChild(element);
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}
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} // Replace .katex-mathml elements with their annotation (TeX source)
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// descendant, with inline delimiters.
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var katexMathml = fragment.querySelectorAll('.katex-mathml');
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for (var _i = 0; _i < katexMathml.length; _i++) {
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var _element = katexMathml[_i];
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var texSource = _element.querySelector('annotation');
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if (texSource) {
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if (_element.replaceWith) {
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_element.replaceWith(texSource);
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} else if (_element.parentNode) {
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_element.parentNode.replaceChild(texSource, _element);
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}
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texSource.innerHTML = copyDelimiters.inline[0] + texSource.innerHTML + copyDelimiters.inline[1];
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}
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} // Switch display math to display delimiters.
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var displays = fragment.querySelectorAll('.katex-display annotation');
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for (var _i2 = 0; _i2 < displays.length; _i2++) {
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var _element2 = displays[_i2];
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_element2.innerHTML = copyDelimiters.display[0] + _element2.innerHTML.substr(copyDelimiters.inline[0].length, _element2.innerHTML.length - copyDelimiters.inline[0].length - copyDelimiters.inline[1].length) + copyDelimiters.display[1];
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}
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return fragment;
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}
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function closestKatex(node) {
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// If node is a Text Node, for example, go up to containing Element,
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// where we can apply the `closest` method.
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var element = node instanceof Element ? node : node.parentElement;
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return element && element.closest('.katex');
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} // Global copy handler to modify behavior on/within .katex elements.
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document.addEventListener('copy', function (event) {
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var selection = window.getSelection();
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if (selection.isCollapsed || !event.clipboardData) {
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return; // default action OK if selection is empty or unchangeable
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}
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var clipboardData = event.clipboardData;
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var range = selection.getRangeAt(0); // When start point is within a formula, expand to entire formula.
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var startKatex = closestKatex(range.startContainer);
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if (startKatex) {
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range.setStartBefore(startKatex);
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} // Similarly, when end point is within a formula, expand to entire formula.
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var endKatex = closestKatex(range.endContainer);
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if (endKatex) {
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range.setEndAfter(endKatex);
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}
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var fragment = range.cloneContents();
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if (!fragment.querySelector('.katex-mathml')) {
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return; // default action OK if no .katex-mathml elements
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}
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var htmlContents = Array.prototype.map.call(fragment.childNodes, el => el instanceof Text ? el.textContent : el.outerHTML).join(''); // Preserve usual HTML copy/paste behavior.
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clipboardData.setData('text/html', htmlContents); // Rewrite plain-text version.
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clipboardData.setData('text/plain', katexReplaceWithTex(fragment).textContent); // Prevent normal copy handling.
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event.preventDefault();
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});
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