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// @flow strict
/**
* Returns a number indicating whether a reference string comes before, or after,
* or is the same as the given string in natural sort order.
*
* See: https://en.wikipedia.org/wiki/Natural_sort_order
*
*/
export default function naturalCompare(aStr: string, bStr: string): number {
let aIdx = 0;
let bIdx = 0;
while (aIdx < aStr.length && bIdx < bStr.length) {
let aChar = aStr.charCodeAt(aIdx);
let bChar = bStr.charCodeAt(bIdx);
if (isDigit(aChar) && isDigit(bChar)) {
let aNum = 0;
do {
++aIdx;
aNum = aNum * 10 + aChar - DIGIT_0;
aChar = aStr.charCodeAt(aIdx);
} while (isDigit(aChar) && aNum > 0);
let bNum = 0;
do {
++bIdx;
bNum = bNum * 10 + bChar - DIGIT_0;
bChar = bStr.charCodeAt(bIdx);
} while (isDigit(bChar) && bNum > 0);
if (aNum < bNum) {
return -1;
}
if (aNum > bNum) {
return 1;
}
} else {
if (aChar < bChar) {
return -1;
}
if (aChar > bChar) {
return 1;
}
++aIdx;
++bIdx;
}
}
return aStr.length - bStr.length;
}
const DIGIT_0 = 48;
const DIGIT_9 = 57;
function isDigit(code: number): boolean {
return !isNaN(code) && DIGIT_0 <= code && code <= DIGIT_9;
}
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