auto import from //depot/cupcake/@135843

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diff --git a/scripts/app_engine_server/gae_shell/static/shell.js b/scripts/app_engine_server/gae_shell/static/shell.js
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+// Copyright 2007 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview
+ * Javascript code for the interactive AJAX shell.
+ *
+ * Part of http://code.google.com/p/google-app-engine-samples/.
+ *
+ * Includes a function (shell.runStatement) that sends the current python
+ * statement in the shell prompt text box to the server, and a callback
+ * (shell.done) that displays the results when the XmlHttpRequest returns.
+ *
+ * Also includes cross-browser code (shell.getXmlHttpRequest) to get an
+ * XmlHttpRequest.
+ */
+
+/**
+ * Shell namespace.
+ * @type {Object}
+ */
+var shell = {}
+
+/**
+ * The shell history. history is an array of strings, ordered oldest to
+ * newest. historyCursor is the current history element that the user is on.
+ *
+ * The last history element is the statement that the user is currently
+ * typing. When a statement is run, it's frozen in the history, a new history
+ * element is added to the end of the array for the new statement, and
+ * historyCursor is updated to point to the new element.
+ *
+ * @type {Array}
+ */
+shell.history = [''];
+
+/**
+ * See {shell.history}
+ * @type {number}
+ */
+shell.historyCursor = 0;
+
+/**
+ * A constant for the XmlHttpRequest 'done' state.
+ * @type Number
+ */
+shell.DONE_STATE = 4;
+
+/**
+ * A cross-browser function to get an XmlHttpRequest object.
+ *
+ * @return {XmlHttpRequest?} a new XmlHttpRequest
+ */
+shell.getXmlHttpRequest = function() {
+  if (window.XMLHttpRequest) {
+    return new XMLHttpRequest();
+  } else if (window.ActiveXObject) {
+    try {
+      return new ActiveXObject('Msxml2.XMLHTTP');
+    } catch(e) {
+      return new ActiveXObject('Microsoft.XMLHTTP');
+    }
+  }
+
+  return null;
+};
+
+/**
+ * This is the prompt textarea's onkeypress handler. Depending on the key that
+ * was pressed, it will run the statement, navigate the history, or update the
+ * current statement in the history.
+ *
+ * @param {Event} event the keypress event
+ * @return {Boolean} false to tell the browser not to submit the form.
+ */
+shell.onPromptKeyPress = function(event) {
+  var statement = document.getElementById('statement');
+
+  if (this.historyCursor == this.history.length - 1) {
+    // we're on the current statement. update it in the history before doing
+    // anything.
+    this.history[this.historyCursor] = statement.value;
+  }
+
+  // should we pull something from the history?
+  if (event.ctrlKey && event.keyCode == 38 /* up arrow */) {
+    if (this.historyCursor > 0) {
+      statement.value = this.history[--this.historyCursor];
+    }
+    return false;
+  } else if (event.ctrlKey && event.keyCode == 40 /* down arrow */) {
+    if (this.historyCursor < this.history.length - 1) {
+      statement.value = this.history[++this.historyCursor];
+    }
+    return false;
+  } else if (!event.altKey) {
+    // probably changing the statement. update it in the history.
+    this.historyCursor = this.history.length - 1;
+    this.history[this.historyCursor] = statement.value;
+  }
+
+  // should we submit?
+  var ctrlEnter = (document.getElementById('submit_key').value == 'ctrl-enter');
+  if (event.keyCode == 13 /* enter */ && !event.altKey && !event.shiftKey &&
+      event.ctrlKey == ctrlEnter) {
+    return this.runStatement();
+  }
+};
+
+/**
+ * The XmlHttpRequest callback. If the request succeeds, it adds the command
+ * and its resulting output to the shell history div.
+ *
+ * @param {XmlHttpRequest} req the XmlHttpRequest we used to send the current
+ *     statement to the server
+ */
+shell.done = function(req) {
+  if (req.readyState == this.DONE_STATE) {
+    var statement = document.getElementById('statement')
+    statement.className = 'prompt';
+
+    // add the command to the shell output
+    var output = document.getElementById('output');
+
+    output.value += '\n>>> ' + statement.value;
+    statement.value = '';
+
+    // add a new history element
+    this.history.push('');
+    this.historyCursor = this.history.length - 1;
+
+    // add the command's result
+    var result = req.responseText.replace(/^\s*|\s*$/g, '');  // trim whitespace
+    if (result != '')
+      output.value += '\n' + result;
+
+    // scroll to the bottom
+    output.scrollTop = output.scrollHeight;
+    if (output.createTextRange) {
+      var range = output.createTextRange();
+      range.collapse(false);
+      range.select();
+    }
+  }
+};
+
+/**
+ * This is the form's onsubmit handler. It sends the python statement to the
+ * server, and registers shell.done() as the callback to run when it returns.
+ *
+ * @return {Boolean} false to tell the browser not to submit the form.
+ */
+shell.runStatement = function() {
+  var form = document.getElementById('form');
+
+  // build a XmlHttpRequest
+  var req = this.getXmlHttpRequest();
+  if (!req) {
+    document.getElementById('ajax-status').innerHTML =
+        "<span class='error'>Your browser doesn't support AJAX. :(</span>";
+    return false;
+  }
+
+  req.onreadystatechange = function() { shell.done(req); };
+
+  // build the query parameter string
+  var params = '';
+  for (i = 0; i < form.elements.length; i++) {
+    var elem = form.elements[i];
+    if (elem.type != 'submit' && elem.type != 'button' && elem.id != 'caret') {
+      var value = escape(elem.value).replace(/\+/g, '%2B'); // escape ignores +
+      params += '&' + elem.name + '=' + value;
+    }
+  }
+
+  // send the request and tell the user.
+  document.getElementById('statement').className = 'prompt processing';
+  req.open(form.method, form.action + '?' + params, true);
+  req.setRequestHeader('Content-type',
+                       'application/x-www-form-urlencoded;charset=UTF-8');
+  req.send(null);
+
+  return false;
+};