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