Function countLinesUntil

test/test.js:797–804

(str, index)

}

function countLinesUntil(str, index) {
	var count = 1;
	while ((index = str.lastIndexOf('\n', index)) !== -1) {
		++count;
		--index;
	}
	return count;
}

function indexToLineAndColumn(src, index) {
	var indexOfLine = src.lastIndexOf('\n', index-1) + 1;