45 lines
923 B
JavaScript
45 lines
923 B
JavaScript
'use strict';
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var path = require('path');
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function getLongExtension(basename) {
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if (basename[basename.length - 1] === '.') {
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return null;
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}
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var startIndex = (basename[0] === '.') ? 1 : 0;
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var dotIndex = basename.indexOf('.', startIndex);
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if (dotIndex <= startIndex) {
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return null;
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}
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return basename.slice(dotIndex);
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}
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function getPossibleExtensions(longExtension) {
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var arr = [longExtension];
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var len = longExtension.length;
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var startIndex = 1;
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while (startIndex < len) {
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var dotIndex = longExtension.indexOf('.', startIndex);
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if (dotIndex < 0) {
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break;
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}
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arr.push(longExtension.slice(dotIndex));
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startIndex = dotIndex + 1;
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}
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return arr;
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}
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module.exports = function(input) {
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var basename = path.basename(input);
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var longExtension = getLongExtension(basename);
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if (!longExtension) {
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return;
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}
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return getPossibleExtensions(longExtension);
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};
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