a new start

assets/bower_components/katex/dist/contrib/copy-tex.mjs

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+// Set these to how you want inline and display math to be delimited.
+const defaultCopyDelimiters = {
+	inline: ["$", "$"],
+	// alternative: ['\(', '\)']
+	display: ["$$", "$$"], // alternative: ['\[', '\]']
+}; // Replace .katex elements with their TeX source (<annotation> element).
+// Modifies fragment in-place.  Useful for writing your own 'copy' handler,
+// as in copy-tex.js.
+
+const katexReplaceWithTex = function katexReplaceWithTex(
+	fragment,
+	copyDelimiters,
+) {
+	if (copyDelimiters === void 0) {
+		copyDelimiters = defaultCopyDelimiters;
+	}
+
+	// Remove .katex-html blocks that are preceded by .katex-mathml blocks
+	// (which will get replaced below).
+	const katexHtml = fragment.querySelectorAll(".katex-mathml + .katex-html");
+
+	for (let i = 0; i < katexHtml.length; i++) {
+		const element = katexHtml[i];
+
+		if (element.remove) {
+			element.remove(null);
+		} else {
+			element.parentNode.removeChild(element);
+		}
+	} // Replace .katex-mathml elements with their annotation (TeX source)
+	// descendant, with inline delimiters.
+
+	const katexMathml = fragment.querySelectorAll(".katex-mathml");
+
+	for (let i = 0; i < katexMathml.length; i++) {
+		const element = katexMathml[i];
+		const texSource = element.querySelector("annotation");
+
+		if (texSource) {
+			if (element.replaceWith) {
+				element.replaceWith(texSource);
+			} else {
+				element.parentNode.replaceChild(texSource, element);
+			}
+
+			texSource.innerHTML =
+				copyDelimiters.inline[0] +
+				texSource.innerHTML +
+				copyDelimiters.inline[1];
+		}
+	} // Switch display math to display delimiters.
+
+	const displays = fragment.querySelectorAll(".katex-display annotation");
+
+	for (let i = 0; i < displays.length; i++) {
+		const element = displays[i];
+		element.innerHTML =
+			copyDelimiters.display[0] +
+			element.innerHTML.substr(
+				copyDelimiters.inline[0].length,
+				element.innerHTML.length -
+					copyDelimiters.inline[0].length -
+					copyDelimiters.inline[1].length,
+			) +
+			copyDelimiters.display[1];
+	}
+
+	return fragment;
+};
+
+document.addEventListener("copy", function (event) {
+	const selection = window.getSelection();
+
+	if (selection.isCollapsed) {
+		return; // default action OK if selection is empty
+	}
+
+	const fragment = selection.getRangeAt(0).cloneContents();
+
+	if (!fragment.querySelector(".katex-mathml")) {
+		return; // default action OK if no .katex-mathml elements
+	} // Preserve usual HTML copy/paste behavior.
+
+	const html = [];
+
+	for (let i = 0; i < fragment.childNodes.length; i++) {
+		html.push(fragment.childNodes[i].outerHTML);
+	}
+
+	event.clipboardData.setData("text/html", html.join("")); // Rewrite plain-text version.
+
+	event.clipboardData.setData(
+		"text/plain",
+		katexReplaceWithTex(fragment).textContent,
+	); // Prevent normal copy handling.
+
+	event.preventDefault();
+});