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Viewing file:     prism-copy-to-clipboard.js (3.84 KB)      -rwxrwxr-x

(function () {

	if (typeof Prism === 'undefined' || typeof document === 'undefined') {
		return;
	}

	if (!Prism.plugins.toolbar) {
		console.warn('Copy to Clipboard plugin loaded before Toolbar plugin.');

		return;
	}

	/**
	 * When the given elements is clicked by the user, the given text will be copied to clipboard.
	 *
	 * @param {HTMLElement} element
	 * @param {CopyInfo} copyInfo
	 *
	 * @typedef CopyInfo
	 * @property {() => string} getText
	 * @property {() => void} success
	 * @property {(reason: unknown) => void} error
	 */
	function registerClipboard(element, copyInfo) {
		element.addEventListener('click', function () {
			copyTextToClipboard(copyInfo);
		});
	}

	// https://stackoverflow.com/a/30810322/7595472

	/** @param {CopyInfo} copyInfo */
	function fallbackCopyTextToClipboard(copyInfo) {
		var textArea = document.createElement('textarea');
		textArea.value = copyInfo.getText();

		// Avoid scrolling to bottom
		textArea.style.top = '0';
		textArea.style.left = '0';
		textArea.style.position = 'fixed';

		document.body.appendChild(textArea);
		textArea.focus();
		textArea.select();

		try {
			var successful = document.execCommand('copy');
			setTimeout(function () {
				if (successful) {
					copyInfo.success();
				} else {
					copyInfo.error();
				}
			}, 1);
		} catch (err) {
			setTimeout(function () {
				copyInfo.error(err);
			}, 1);
		}

		document.body.removeChild(textArea);
	}
	/** @param {CopyInfo} copyInfo */
	function copyTextToClipboard(copyInfo) {
		if (navigator.clipboard) {
			navigator.clipboard.writeText(copyInfo.getText()).then(copyInfo.success, function () {
				// try the fallback in case `writeText` didn't work
				fallbackCopyTextToClipboard(copyInfo);
			});
		} else {
			fallbackCopyTextToClipboard(copyInfo);
		}
	}

	/**
	 * Selects the text content of the given element.
	 *
	 * @param {Element} element
	 */
	function selectElementText(element) {
		// https://stackoverflow.com/a/20079910/7595472
		window.getSelection().selectAllChildren(element);
	}

	/**
	 * Traverses up the DOM tree to find data attributes that override the default plugin settings.
	 *
	 * @param {Element} startElement An element to start from.
	 * @returns {Settings} The plugin settings.
	 * @typedef {Record<"copy" | "copy-error" | "copy-success" | "copy-timeout", string | number>} Settings
	 */
	function getSettings(startElement) {
		/** @type {Settings} */
		var settings = {
			'copy': 'Copy',
			'copy-error': 'Press Ctrl+C to copy',
			'copy-success': 'Copied!',
			'copy-timeout': 5000
		};

		var prefix = 'data-prismjs-';
		for (var key in settings) {
			var attr = prefix + key;
			var element = startElement;
			while (element && !element.hasAttribute(attr)) {
				element = element.parentElement;
			}
			if (element) {
				settings[key] = element.getAttribute(attr);
			}
		}
		return settings;
	}

	Prism.plugins.toolbar.registerButton('copy-to-clipboard', function (env) {
		var element = env.element;

		var settings = getSettings(element);

		var linkCopy = document.createElement('button');
		linkCopy.className = 'copy-to-clipboard-button';
		linkCopy.setAttribute('type', 'button');
		var linkSpan = document.createElement('span');
		linkCopy.appendChild(linkSpan);

		setState('copy');

		registerClipboard(linkCopy, {
			getText: function () {
				return element.textContent;
			},
			success: function () {
				setState('copy-success');

				resetText();
			},
			error: function () {
				setState('copy-error');

				setTimeout(function () {
					selectElementText(element);
				}, 1);

				resetText();
			}
		});

		return linkCopy;

		function resetText() {
			setTimeout(function () { setState('copy'); }, settings['copy-timeout']);
		}

		/** @param {"copy" | "copy-error" | "copy-success"} state */
		function setState(state) {
			linkSpan.textContent = settings[state];
			linkCopy.setAttribute('data-copy-state', state);
		}
	});
}());