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/*jshint node:true */
"use strict";
var sequence = function (tasks, names, results, nest) {
var i, name, node, e, j;
nest = nest || [];
for (i = 0; i < names.length; i++) {
name = names[i];
// de-dup results
if (results.indexOf(name) === -1) {
node = tasks[name];
if (!node) {
e = new Error('task "'+name+'" is not defined');
e.missingTask = name;
e.taskList = [];
for (j in tasks) {
if (tasks.hasOwnProperty(j)) {
e.taskList.push(tasks[j].name);
}
}
throw e;
}
if (nest.indexOf(name) > -1) {
nest.push(name);
e = new Error('Recursive dependencies detected: '+nest.join(' -> '));
e.recursiveTasks = nest;
e.taskList = [];
for (j in tasks) {
if (tasks.hasOwnProperty(j)) {
e.taskList.push(tasks[j].name);
}
}
throw e;
}
if (node.dep.length) {
nest.push(name);
sequence(tasks, node.dep, results, nest); // recurse
nest.pop(name);
}
results.push(name);
}
}
};
module.exports = sequence;
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