Function createCursorWithCount

lib/languages/js/source-code/token-store/index.js:145–187

* Creates the cursor iterates tokens with options. * @param {CursorFactory} factory The cursor factory to initialize cursor. * @param {Token[]} tokens The array of tokens. * @param {Comment[]} comments The array of comments. * @param {Object} indexMap The map from locations to indices in `tokens

(
	factory,
	tokens,
	comments,
	indexMap,
	startLoc,
	endLoc,
	opts,
)

 * @private
 */
function createCursorWithCount(
	factory,
	tokens,
	comments,
	indexMap,
	startLoc,
	endLoc,
	opts,
) {
	let includeComments = false;
	let count = 0;
	let countExists = false;
	let filter = null;

	if (typeof opts === "number") {
		count = opts | 0;
		countExists = true;
	} else if (typeof opts === "function") {
		filter = opts;
	} else if (opts) {
		includeComments = !!opts.includeComments;
		count = opts.count | 0;
		countExists = typeof opts.count === "number";
		filter = opts.filter || null;
	}
	assert(count >= 0, "options.count should be zero or a positive integer.");
	assert(
		!filter || typeof filter === "function",
		"options.filter should be a function.",
	);

	return factory.createCursor(
		tokens,
		comments,
		indexMap,
		startLoc,
		endLoc,
		includeComments,
		filter,
		0,
		countExists ? count : -1,
	);
}

/**
 * Creates the cursor iterates tokens with options.