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'use strict';
function Sorter() {
}
Sorter.prototype.sort = function(tokens, fromIndex) {
fromIndex = fromIndex || 0;
for (var i = 0, len = this.keys.length; i < len; i++) {
var key = this.keys[i];
var token = key.slice(1);
var index = tokens.indexOf(token, fromIndex);
if (index !== -1) {
do {
if (index !== fromIndex) {
tokens.splice(index, 1);
tokens.splice(fromIndex, 0, token);
}
fromIndex++;
} while ((index = tokens.indexOf(token, fromIndex)) !== -1);
return this[key].sort(tokens, fromIndex);
}
}
return tokens;
};
function TokenChain() {
}
TokenChain.prototype = {
add: function(tokens) {
var self = this;
tokens.forEach(function(token) {
var key = '$' + token;
if (!self[key]) {
self[key] = [];
self[key].processed = 0;
}
self[key].push(tokens);
});
},
createSorter: function() {
var self = this;
var sorter = new Sorter();
sorter.keys = Object.keys(self).sort(function(j, k) {
var m = self[j].length;
var n = self[k].length;
return m < n ? 1 : m > n ? -1 : j < k ? -1 : j > k ? 1 : 0;
}).filter(function(key) {
if (self[key].processed < self[key].length) {
var token = key.slice(1);
var chain = new TokenChain();
self[key].forEach(function(tokens) {
var index;
while ((index = tokens.indexOf(token)) !== -1) {
tokens.splice(index, 1);
}
tokens.forEach(function(token) {
self['$' + token].processed++;
});
chain.add(tokens.slice(0));
});
sorter[key] = chain.createSorter();
return true;
}
return false;
});
return sorter;
}
};
module.exports = TokenChain;