Function attributes

packages/svelte/src/compiler/print/index.js:68–131

* @param {AST.BaseNode} node * @param {AST.BaseElement['attributes']} attributes * @param {Context} context * @param {AST.JSComment[]} comments * @returns {boolean} true if attributes were formatted on multiple lines

(node, attributes, context, comments)

 * @returns {boolean} true if attributes were formatted on multiple lines
 */
function attributes(node, attributes, context, comments) {
	if (attributes.length === 0) {
		return false;
	}

	let length = -1;

	let comment_index = comments.findIndex((comment) => comment.start > node.start);

	if (comment_index === -1) {
		comment_index = comments.length;
	}

	const separator = context.new();

	const children = attributes.map((attribute) => {
		const child_context = context.new();

		while (comment_index < comments.length) {
			const comment = comments[comment_index];

			if (comment.start < attribute.start) {
				if (comment.type === 'Line') {
					child_context.write('//' + comment.value);
					child_context.newline();
				} else {
					child_context.write('/*' + comment.value + '*/'); // TODO match indentation?
					child_context.append(separator);
				}

				comment_index += 1;
			} else {
				break;
			}
		}

		child_context.visit(attribute);

		length += child_context.measure() + 1;

		return child_context;
	});

	let multiline = context.multiline || length > LINE_BREAK_THRESHOLD;

	if (multiline) {
		separator.newline();
		context.indent();
		for (const child of children) {
			context.newline();
			context.append(child);
		}
		context.dedent();
		context.newline();
	} else {
		separator.write(' ');
		for (const child of children) {
			context.write(' ');