.

qwen/nodejs/node_modules/asynckit/lib/iterate.js

@@ -0,0 +1,75 @@
+var async = require('./async.js')
+  , abort = require('./abort.js')
+  ;
+
+// API
+module.exports = iterate;
+
+/**
+ * Iterates over each job object
+ *
+ * @param {array|object} list - array or object (named list) to iterate over
+ * @param {function} iterator - iterator to run
+ * @param {object} state - current job status
+ * @param {function} callback - invoked when all elements processed
+ */
+function iterate(list, iterator, state, callback)
+{
+  // store current index
+  var key = state['keyedList'] ? state['keyedList'][state.index] : state.index;
+
+  state.jobs[key] = runJob(iterator, key, list[key], function(error, output)
+  {
+    // don't repeat yourself
+    // skip secondary callbacks
+    if (!(key in state.jobs))
+    {
+      return;
+    }
+
+    // clean up jobs
+    delete state.jobs[key];
+
+    if (error)
+    {
+      // don't process rest of the results
+      // stop still active jobs
+      // and reset the list
+      abort(state);
+    }
+    else
+    {
+      state.results[key] = output;
+    }
+
+    // return salvaged results
+    callback(error, state.results);
+  });
+}
+
+/**
+ * Runs iterator over provided job element
+ *
+ * @param   {function} iterator - iterator to invoke
+ * @param   {string|number} key - key/index of the element in the list of jobs
+ * @param   {mixed} item - job description
+ * @param   {function} callback - invoked after iterator is done with the job
+ * @returns {function|mixed} - job abort function or something else
+ */
+function runJob(iterator, key, item, callback)
+{
+  var aborter;
+
+  // allow shortcut if iterator expects only two arguments
+  if (iterator.length == 2)
+  {
+    aborter = iterator(item, async(callback));
+  }
+  // otherwise go with full three arguments
+  else
+  {
+    aborter = iterator(item, key, async(callback));
+  }
+
+  return aborter;
+}