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'use strict';
var path = require('path');
var findIndex = require('find-index');
var flattenGlob = function(arr){
var out = [];
var flat = true;
for(var i = 0; i < arr.length; i++) {
if (typeof arr[i] !== 'string') {
flat = false;
break;
}
out.push(arr[i]);
}
// last one is a file or specific dir
// so we pop it off
if (flat) {
out.pop();
}
return out;
};
var flattenExpansion = function(set) {
var first = set[0];
var toCompare = set.slice(1);
// find index where the diff is
var idx = findIndex(first, function(v, idx){
if (typeof v !== 'string') {
return true;
}
var matched = toCompare.every(function(arr){
return v === arr[idx];
});
return !matched;
});
return first.slice(0, idx);
};
var setToBase = function(set) {
// normal something/*.js
if (set.length <= 1) {
return flattenGlob(set[0]);
}
// has expansion
return flattenExpansion(set);
};
module.exports = function(glob) {
var set = glob.minimatch.set;
var baseParts = setToBase(set);
var basePath = path.normalize(baseParts.join(path.sep))+path.sep;
return basePath;
};
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