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- /**
- * 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, bStr) {
- var aIdx = 0;
- var bIdx = 0;
- while (aIdx < aStr.length && bIdx < bStr.length) {
- var aChar = aStr.charCodeAt(aIdx);
- var bChar = bStr.charCodeAt(bIdx);
- if (isDigit(aChar) && isDigit(bChar)) {
- var aNum = 0;
- do {
- ++aIdx;
- aNum = aNum * 10 + aChar - DIGIT_0;
- aChar = aStr.charCodeAt(aIdx);
- } while (isDigit(aChar) && aNum > 0);
- var 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;
- }
- var DIGIT_0 = 48;
- var DIGIT_9 = 57;
- function isDigit(code) {
- return !isNaN(code) && DIGIT_0 <= code && code <= DIGIT_9;
- }
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