Update JSTemplate to the latest version from Google Code

chrome/third_party/jstemplate/jstemplate_compiled.js

+(function(){
 /**
- * @fileoverview This file contains miscellaneous basic functionality.
- *
+ * @fileoverview Miscellaneous constants and functions referenced in
+ * the main source files.
  */
 
-/**
- * Creates a DOM element with the given tag name in the document of the
- * owner element.
- *
- * @param {String} tagName  The name of the tag to create.
- * @param {Element} owner The intended owner (i.e., parent element) of
- * the created element.
- * @param {Point} opt_position  The top-left corner of the created element.
- * @param {Size} opt_size  The size of the created element.
- * @param {Boolean} opt_noAppend Do not append the new element to the owner.
- * @return {Element}  The newly created element node.
- */
-function createElement(tagName, owner, opt_position, opt_size, opt_noAppend) {
-  var element = ownerDocument(owner).createElement(tagName);
-  if (opt_position) {
-    setPosition(element, opt_position);
-  }
-  if (opt_size) {
-    setSize(element, opt_size);
-  }
-  if (owner && !opt_noAppend) {
-    appendChild(owner, element);
-  }
+function log(msg) {}
 
-  return element;
-}
+/** @const */ var STRING_empty = '';
 
-/**
- * Creates a text node with the given value.
- *
- * @param {String} value  The text to place in the new node.
- * @param {Element} owner The owner (i.e., parent element) of the new
- * text node.
- * @return {Text}  The newly created text node.
- */
-function createTextNode(value, owner) {
-  var element = ownerDocument(owner).createTextNode(value);
-  if (owner) {
-    appendChild(owner, element);
-  }
-  return element;
-}
+/** @const */ var CSS_display = 'display';
+/** @const */ var CSS_position = 'position';
 
-/**
- * Returns the document owner of the given element. In particular,
- * returns window.document if node is null or the browser does not
- * support ownerDocument.
- *
- * @param {Node} node  The node whose ownerDocument is required.
- * @returns {Document|Null}  The owner document or null if unsupported.
- */
-function ownerDocument(node) {
-  return (node ? node.ownerDocument : null) || document;
-}
-
-/**
- * Wrapper function to create CSS units (pixels) string
- *
- * @param {Number} numPixels  Number of pixels, may be floating point.
- * @returns {String}  Corresponding CSS units string.
- */
-function px(numPixels) {
-  return round(numPixels) + "px";
-}
-
-/**
- * Sets the left and top of the given element to the given point.
- *
- * @param {Element} element  The dom element to manipulate.
- * @param {Point} point  The desired position.
- */
-function setPosition(element, point) {
-  var style = element.style;
-  style.position = "absolute";
-  style.left = px(point.x);
-  style.top = px(point.y);
-}
-
-/**
- * Sets the width and height style attributes to the given size.
- *
- * @param {Element} element  The dom element to manipulate.
- * @param {Size} size  The desired size.
- */
-function setSize(element, size) {
-  var style = element.style;
-  style.width = px(size.width);
-  style.height = px(size.height);
-}
-
-/**
- * Sets display to none. Doing this as a function saves a few bytes for
- * the 'style.display' property and the 'none' literal.
- *
- * @param {Element} node  The dom element to manipulate.
- */
-function displayNone(node) {
-  node.style.display = 'none';
-}
-
-/**
- * Sets display to default.
- *
- * @param {Element} node  The dom element to manipulate.
- */
-function displayDefault(node) {
-  node.style.display = '';
-}
-
-/**
- * Appends the given child to the given parent in the DOM
- *
- * @param {Element} parent  The parent dom element.
- * @param {Node} child  The new child dom node.
- */
-function appendChild(parent, child) {
-  parent.appendChild(child);
-}
+var TYPE_boolean = 'boolean';
+var TYPE_number = 'number';
+var TYPE_object = 'object';
+var TYPE_string = 'string';
+var TYPE_function = 'function';
+var TYPE_undefined = 'undefined';
 
 
 /**
  * Wrapper for the eval() builtin function to evaluate expressions and
  * obtain their value. It wraps the expression in parentheses such
  * that object literals are really evaluated to objects. Without the
  * wrapping, they are evaluated as block, and create syntax
  * errors. Also protects against other syntax errors in the eval()ed
  * code and returns null if the eval throws an exception.
  *
- * @param {String} expr
- * @return {Object|Null}
+ * @param {string} expr
+ * @return {Object|null}
  */
 function jsEval(expr) {
   try {
     return eval('[' + expr + '][0]');
   } catch (e) {
+    log('EVAL FAILED ' + expr + ': ' + e);
     return null;
   }
 }
 
+function jsLength(obj) {
+  return obj.length;
+}
+
+function assert(obj) {}
+
+/**
+ * Copies all properties from second object to the first.  Modifies to.
+ *
+ * @param {Object} to  The target object.
+ * @param {Object} from  The source object.
+ */
+function copyProperties(to, from) {
+  for (var p in from) {
+    to[p] = from[p];
+  }
+}
+
 
 /**
- * Wrapper for the eval() builtin function to execute statements. This
- * guards against exceptions thrown, but doesn't return a
- * value. Still, mostly for testability, it returns a boolean to
- * indicate whether execution was successful. NOTE:
- * javascript's eval semantics is murky in that it confounds
- * expression evaluation and statement execution into a single
- * construct. Cf. jsEval().
- *
- * @param {String} stmt
- * @return {Boolean}
+ * @param {Object|null|undefined} value The possible value to use.
+ * @param {Object} defaultValue The default if the value is not set.
+ * @return {Object} The value, if it is
+ * defined and not null; otherwise the default
  */
-function jsExec(stmt) {
-  try {
-    eval(stmt);
-    return true;
-  } catch (e) {
-    return false;
+function getDefaultObject(value, defaultValue) {
+  if (typeof value != TYPE_undefined && value != null) {
+    return /** @type Object */(value);
+  } else {
+    return defaultValue;
   }
 }
 
+/**
+ * Detect if an object looks like an Array.
+ * Note that instanceof Array is not robust; for example an Array
+ * created in another iframe fails instanceof Array.
+ * @param {Object|null} value Object to interrogate
+ * @return {boolean} Is the object an array?
+ */
+function isArray(value) {
+  return value != null &&
+      typeof value == TYPE_object &&
+      typeof value.length == TYPE_number;
+}
+
 
 /**
- * Wrapper for eval with a context. NOTE: The style guide
- * deprecates eval, so this is the exception that proves the
- * rule. Notice also that since the value of the expression is
- * returned rather than assigned to a local variable, one major
- * objection aganist the use of the with() statement, namely that
- * properties of the with() target override local variables of the
- * same name, is void here.
+ * Finds a slice of an array.
  *
- * @param {String} expr
- * @param {Object} context
- * @return {Object|Null}
+ * @param {Array} array  Array to be sliced.
+ * @param {number} start  The start of the slice.
+ * @param {number} opt_end  The end of the slice (optional).
+ * @return {Array} array  The slice of the array from start to end.
  */
-function jsEvalWith(expr, context) {
-  try {
-    with (context) {
-      return eval('[' + expr + '][0]');
-    }
-  } catch (e) {
-    return null;
+function arraySlice(array, start, opt_end) {
+  return Function.prototype.call.apply(Array.prototype.slice, arguments);
+}
+
+
+/**
+ * Jscompiler wrapper for parseInt() with base 10.
+ *
+ * @param {string} s string repersentation of a number.
+ *
+ * @return {number} The integer contained in s, converted on base 10.
+ */
+function parseInt10(s) {
+  return parseInt(s, 10);
+}
+
+
+/**
+ * Clears the array by setting the length property to 0. This usually
+ * works, and if it should turn out not to work everywhere, here would
+ * be the place to implement the browser specific workaround.
+ *
+ * @param {Array} array  Array to be cleared.
+ */
+function arrayClear(array) {
+  array.length = 0;
+}
+
+
+/**
+ * Prebinds "this" within the given method to an object, but ignores all
+ * arguments passed to the resulting function.
+ * I.e. var_args are all the arguments that method is invoked with when
+ * invoking the bound function.
+ *
+ * @param {Object|null} object  The object that the method call targets.
+ * @param {Function} method  The target method.
+ * @return {Function}  Method with the target object bound to it and curried by
+ *                     the provided arguments.
+ */
+function bindFully(object, method, var_args) {
+  var args = arraySlice(arguments, 2);
+  return function() {
+    return method.apply(object, args);
   }
 }
 
-
 var DOM_ELEMENT_NODE = 1;
 var DOM_ATTRIBUTE_NODE = 2;
 var DOM_TEXT_NODE = 3;
 var DOM_CDATA_SECTION_NODE = 4;
 var DOM_ENTITY_REFERENCE_NODE = 5;
 var DOM_ENTITY_NODE = 6;
 var DOM_PROCESSING_INSTRUCTION_NODE = 7;
 var DOM_COMMENT_NODE = 8;
 var DOM_DOCUMENT_NODE = 9;
 var DOM_DOCUMENT_TYPE_NODE = 10;
 var DOM_DOCUMENT_FRAGMENT_NODE = 11;
 var DOM_NOTATION_NODE = 12;
 
+
+
+function domGetElementById(document, id) {
+  return document.getElementById(id);
+}
+
 /**
- * Traverses the element nodes in the DOM tree underneath the given
- * node and finds the first node with elemId, or null if there is no such
- * element.  Traversal is in depth-first order.
+ * Creates a new node in the given document
  *
- * NOTE: The reason this is not combined with the elem() function is
- * that the implementations are different.
- * elem() is a wrapper for the built-in document.getElementById() function,
- * whereas this function performs the traversal itself.
- * Modifying elem() to take an optional root node is a possibility,
- * but the in-built function would perform better than using our own traversal.
+ * @param {Document} doc  Target document.
+ * @param {string} name  Name of new element (i.e. the tag name)..
+ * @return {Element}  Newly constructed element.
+ */
+function domCreateElement(doc, name) {
+  return doc.createElement(name);
+}
+
+/**
+ * Traverses the element nodes in the DOM section underneath the given
+ * node and invokes the given callback as a method on every element
+ * node encountered.
  *
- * @param {Element} node Root element of subtree to traverse.
- * @param {String} elemId The id of the element to search for.
- * @return {Element|Null} The corresponding element, or null if not found.
+ * @param {Element} node  Parent element of the subtree to traverse.
+ * @param {Function} callback  Called on each node in the traversal.
  */
-function nodeGetElementById(node, elemId) {
+function domTraverseElements(node, callback) {
+  var traverser = new DomTraverser(callback);
+  traverser.run(node);
+}
+
+/**
+ * A class to hold state for a dom traversal.
+ * @param {Function} callback  Called on each node in the traversal.
+ * @constructor
+ * @class
+ */
+function DomTraverser(callback) {
+  this.callback_ = callback;
+}
+
+/**
+ * Processes the dom tree in breadth-first order.
+ * @param {Element} root  The root node of the traversal.
+ */
+DomTraverser.prototype.run = function(root) {
+  var me = this;
+  me.queue_ = [ root ];
+  while (jsLength(me.queue_)) {
+    me.process_(me.queue_.shift());
+  }
+}
+
+/**
+ * Processes a single node.
+ * @param {Element} node  The current node of the traversal.
+ */
+DomTraverser.prototype.process_ = function(node) {
+  var me = this;
+
+  me.callback_(node);
+
   for (var c = node.firstChild; c; c = c.nextSibling) {
-    if (c.id == elemId) {
-      return c;
-    }
     if (c.nodeType == DOM_ELEMENT_NODE) {
-      var n = arguments.callee.call(this, c, elemId);
-      if (n) {
-        return n;
-      }
+      me.queue_.push(c);
     }
   }
-  return null;
 }
 
-
 /**
  * Get an attribute from the DOM.  Simple redirect, exists to compress code.
  *
  * @param {Element} node  Element to interrogate.
- * @param {String} name  Name of parameter to extract.
- * @return {String}  Resulting attribute.
+ * @param {string} name  Name of parameter to extract.
+ * @return {string|null}  Resulting attribute.
  */
 function domGetAttribute(node, name) {
   return node.getAttribute(name);
 }
 
+
 /**
  * Set an attribute in the DOM.  Simple redirect to compress code.
  *
  * @param {Element} node  Element to interrogate.
- * @param {String} name  Name of parameter to set.
- * @param {String} value  Set attribute to this value.
+ * @param {string} name  Name of parameter to set.
+ * @param {string|number} value  Set attribute to this value.
  */
 function domSetAttribute(node, name, value) {
   node.setAttribute(name, value);
 }
 
 /**
  * Remove an attribute from the DOM.  Simple redirect to compress code.
  *
  * @param {Element} node  Element to interrogate.
- * @param {String} name  Name of parameter to remove.
+ * @param {string} name  Name of parameter to remove.
  */
 function domRemoveAttribute(node, name) {
   node.removeAttribute(name);
 }
 
 /**
  * Clone a node in the DOM.
  *
  * @param {Node} node  Node to clone.
  * @return {Node}  Cloned node.
  */
 function domCloneNode(node) {
   return node.cloneNode(true);
 }
 
-
 /**
- * Return a safe string for the className of a node.
- * If className is not a string, returns "".
+ * Clone a element in the DOM.
  *
- * @param {Element} node  DOM element to query.
- * @return {String}
+ * @param {Element} element  Element to clone.
+ * @return {Element}  Cloned element.
  */
-function domClassName(node) {
-  return node.className ? "" + node.className : "";
+function domCloneElement(element) {
+  return /** @type {Element} */(domCloneNode(element));
 }
 
 /**
- * Adds a class name to the class attribute of the given node.
+ * Returns the document owner of the given element. In particular,
+ * returns window.document if node is null or the browser does not
+ * support ownerDocument.  If the node is a document itself, returns
+ * itself.
  *
- * @param {Element} node  DOM element to modify.
- * @param {String} className  Class name to add.
+ * @param {Node|null|undefined} node  The node whose ownerDocument is required.
+ * @returns {Document}  The owner document or window.document if unsupported.
  */
-function domAddClass(node, className) {
-  var name = domClassName(node);
-  if (name) {
-    var cn = name.split(/\s+/);
-    var found = false;
-    for (var i = 0; i < jsLength(cn); ++i) {
-      if (cn[i] == className) {
-        found = true;
-        break;
-      }
-    }
-
-    if (!found) {
-      cn.push(className);
-    }
-
-    node.className = cn.join(' ');
+function ownerDocument(node) {
+  if (!node) {
+    return document;
+  } else if (node.nodeType == DOM_DOCUMENT_NODE) {
+    return /** @type Document */(node);
   } else {
-    node.className = className;
+    return node.ownerDocument || document;
   }
 }
 
 /**
- * Removes a class name from the class attribute of the given node.
+ * Creates a new text node in the given document.
  *
- * @param {Element} node  DOM element to modify.
- * @param {String} className  Class name to remove.
+ * @param {Document} doc  Target document.
+ * @param {string} text  Text composing new text node.
+ * @return {Text}  Newly constructed text node.
  */
-function domRemoveClass(node, className) {
-  var c = domClassName(node);
-  if (!c || c.indexOf(className) == -1) {
-    return;
-  }
-  var cn = c.split(/\s+/);
-  for (var i = 0; i < jsLength(cn); ++i) {
-    if (cn[i] == className) {
-      cn.splice(i--, 1);
-    }
-  }
-  node.className = cn.join(' ');
-}
-
-/**
- * Checks if a node belongs to a style class.
- *
- * @param {Element} node  DOM element to test.
- * @param {String} className  Class name to check for.
- * @return {Boolean}  Node belongs to style class.
- */
-function domTestClass(node, className) {
-  var cn = domClassName(node).split(/\s+/);
-  for (var i = 0; i < jsLength(cn); ++i) {
-    if (cn[i] == className) {
-      return true;
-    }
-  }
-  return false;
-}
-
-/**
- * Inserts a new child before a given sibling.
- *
- * @param {Node} newChild  Node to insert.
- * @param {Node} oldChild  Sibling node.
- * @return {Node}  Reference to new child.
- */
-function domInsertBefore(newChild, oldChild) {
-  return oldChild.parentNode.insertBefore(newChild, oldChild);
+function domCreateTextNode(doc, text) {
+  return doc.createTextNode(text);
 }
 
 /**
  * Appends a new child to the specified (parent) node.
  *
  * @param {Element} node  Parent element.
  * @param {Node} child  Child node to append.
  * @return {Node}  Newly appended node.
  */
 function domAppendChild(node, child) {
   return node.appendChild(child);
 }
 
 /**
- * Remove a new child from the specified (parent) node.
+ * Sets display to default.
  *
- * @param {Element} node  Parent element.
- * @param {Node} child  Child node to remove.
- * @return {Node}  Removed node.
+ * @param {Element} node  The dom element to manipulate.
  */
-function domRemoveChild(node, child) {
-  return node.removeChild(child);
+function displayDefault(node) {
+  node.style[CSS_display] = '';
+}
+
+/**
+ * Sets display to none. Doing this as a function saves a few bytes for
+ * the 'style.display' property and the 'none' literal.
+ *
+ * @param {Element} node  The dom element to manipulate.
+ */
+function displayNone(node) {
+  node.style[CSS_display] = 'none';
+}
+
+
+/**
+ * Sets position style attribute to absolute.
+ *
+ * @param {Element} node  The dom element to manipulate.
+ */
+function positionAbsolute(node) {
+  node.style[CSS_position] = 'absolute';
+}
+
+
+/**
+ * Inserts a new child before a given sibling.
+ *
+ * @param {Node} newChild  Node to insert.
+ * @param {Node} oldChild  Sibling node.
+ * @return {Node}  Reference to new child.
+ */
+function domInsertBefore(newChild, oldChild) {
+  return oldChild.parentNode.insertBefore(newChild, oldChild);
 }
 
 /**
  * Replaces an old child node with a new child node.
  *
  * @param {Node} newChild  New child to append.
  * @param {Node} oldChild  Old child to remove.
  * @return {Node}  Replaced node.
  */
 function domReplaceChild(newChild, oldChild) {
   return oldChild.parentNode.replaceChild(newChild, oldChild);
 }
 
 /**
  * Removes a node from the DOM.
  *
  * @param {Node} node  The node to remove.
  * @return {Node}  The removed node.
  */
 function domRemoveNode(node) {
   return domRemoveChild(node.parentNode, node);
 }
 
 /**
- * Creates a new text node in the given document.
- *
- * @param {Document} doc  Target document.
- * @param {String} text  Text composing new text node.
- * @return {Text}  Newly constructed text node.
- */
-function domCreateTextNode(doc, text) {
-  return doc.createTextNode(text);
-}
-
-/**
- * Creates a new node in the given document
- *
- * @param {Document} doc  Target document.
- * @param {String} name  Name of new element (i.e. the tag name)..
- * @return {Element}  Newly constructed element.
- */
-function domCreateElement(doc, name) {
-  return doc.createElement(name);
-}
-
-/**
- * Creates a new attribute in the given document.
- *
- * @param {Document} doc  Target document.
- * @param {String} name  Name of new attribute.
- * @return {Attr}  Newly constructed attribute.
- */
-function domCreateAttribute(doc, name) {
-  return doc.createAttribute(name);
-}
-
-/**
- * Creates a new comment in the given document.
- *
- * @param {Document} doc  Target document.
- * @param {String} text  Comment text.
- * @return {Comment}  Newly constructed comment.
- */
-function domCreateComment(doc, text) {
-  return doc.createComment(text);
-}
-
-/**
- * Creates a document fragment.
- *
- * @param {Document} doc  Target document.
- * @return {DocumentFragment}  Resulting document fragment node.
- */
-function domCreateDocumentFragment(doc) {
-  return doc.createDocumentFragment();
-}
-
-/**
- * Redirect to document.getElementById
- *
- * @param {Document} doc  Target document.
- * @param {String} id  Id of requested node.
- * @return {Element|Null}  Resulting element.
- */
-function domGetElementById(doc, id) {
-  return doc.getElementById(id);
-}
-
-/**
- * Redirect to window.setInterval
- *
- * @param {Window} win  Target window.
- * @param {Function} fun  Callback function.
- * @param {Number} time  Time in milliseconds.
- * @return {Object}  Contract id.
- */
-function windowSetInterval(win, fun, time) {
-  return win.setInterval(fun, time);
-}
-
-/**
- * Redirect to window.clearInterval
- *
- * @param {Window} win  Target window.
- * @param {object} id  Contract id.
- * @return {any}  NOTE: Return type unknown?
- */
-function windowClearInterval(win, id) {
-  return win.clearInterval(id);
-}
-
-/**
- * Determines whether one node is recursively contained in another.
- * @param parent The parent node.
- * @param child The node to look for in parent.
- * @return parent recursively contains child
- */
-function containsNode(parent, child) {
-  while (parent != child && child.parentNode) {
-    child = child.parentNode;
-  }
-  return parent == child;
-};
-/**
- * @fileoverview This file contains javascript utility functions that
- * do not depend on anything defined elsewhere.
- *
- */
-
-/**
- * Returns the value of the length property of the given object. Used
- * to reduce compiled code size.
- *
- * @param {Array | String} a  The string or array to interrogate.
- * @return {Number}  The value of the length property.
- */
-function jsLength(a) {
-  return a.length;
-}
-
-var min = Math.min;
-var max = Math.max;
-var ceil = Math.ceil;
-var floor = Math.floor;
-var round = Math.round;
-var abs = Math.abs;
-
-/**
- * Copies all properties from second object to the first.  Modifies to.
- *
- * @param {Object} to  The target object.
- * @param {Object} from  The source object.
- */
-function copyProperties(to, from) {
-  foreachin(from, function(p) {
-    to[p] = from[p];
-  });
-}
-
-/**
- * Iterates over the array, calling the given function for each
- * element.
- *
- * @param {Array} array
- * @param {Function} fn
- */
-function foreach(array, fn) {
-  var I = jsLength(array);
-  for (var i = 0; i < I; ++i) {
-    fn(array[i], i);
-  }
-}
-
-/**
- * Safely iterates over all properties of the given object, calling
- * the given function for each property. If opt_all isn't true, uses
- * hasOwnProperty() to assure the property is on the object, not on
- * its prototype.
- *
- * @param {Object} object
- * @param {Function} fn
- * @param {Boolean} opt_all  If true, also iterates over inherited properties.
- */
-function foreachin(object, fn, opt_all) {
-  for (var i in object) {
-    if (opt_all || !object.hasOwnProperty || object.hasOwnProperty(i)) {
-      fn(i, object[i]);
-    }
-  }
-}
-
-/**
- * Appends the second array to the first, copying its elements.
- * Optionally only a slice of the second array is copied.
- *
- * @param {Array} a1  Target array (modified).
- * @param {Array} a2  Source array.
- * @param {Number} opt_begin  Begin of slice of second array (optional).
- * @param {Number} opt_end  End (exclusive) of slice of second array (optional).
- */
-function arrayAppend(a1, a2, opt_begin, opt_end) {
-  var i0 = opt_begin || 0;
-  var i1 = opt_end || jsLength(a2);
-  for (var i = i0; i < i1; ++i) {
-    a1.push(a2[i]);
-  }
-}
+ * Remove a child from the specified (parent) node.
+ *
+ * @param {Element} node  Parent element.
+ * @param {Node} child  Child node to remove.
+ * @return {Node}  Removed node.
+ */
+function domRemoveChild(node, child) {
+  return node.removeChild(child);
+}
+
 
 /**
  * Trim whitespace from begin and end of string.
  *
  * @see testStringTrim();
  *
- * @param {String} str  Input string.
- * @return {String}  Trimmed string.
+ * @param {string} str  Input string.
+ * @return {string}  Trimmed string.
  */
 function stringTrim(str) {
   return stringTrimRight(stringTrimLeft(str));
 }
 
 /**
  * Trim whitespace from beginning of string.
  *
  * @see testStringTrimLeft();
  *
- * @param {String} str  Input string.
- * @return {String}  Trimmed string.
+ * @param {string} str  Input string.
+ * @return {string}  Trimmed string.
  */
 function stringTrimLeft(str) {
   return str.replace(/^\s+/, "");
 }
 
 /**
  * Trim whitespace from end of string.
  *
  * @see testStringTrimRight();
  *
- * @param {String} str  Input string.
- * @return {String}  Trimmed string.
- */
+ * @param {string} str  Input string.
+ * @return {string}  Trimmed string.
+  */
 function stringTrimRight(str) {
   return str.replace(/\s+$/, "");
 }
-
-/**
- * Jscompiler wrapper for parseInt() with base 10.
- *
- * @param {String} s String repersentation of a number.
- *
- * @return {Number} The integer contained in s, converted on base 10.
- */
-function parseInt10(s) {
-  return parseInt(s, 10);
-}
-/**
+/**
+ * Author: Steffen Meschkat <mesch@google.com>
+ *
+ * @fileoverview This class is used to evaluate expressions in a local
+ * context. Used by JstProcessor.
+ */
+
+
+/**
+ * Names of special variables defined by the jstemplate evaluation
+ * context. These can be used in js expression in jstemplate
+ * attributes.
+ */
+var VAR_index = '$index';
+var VAR_count = '$count';
+var VAR_this = '$this';
+var VAR_context = '$context';
+var VAR_top = '$top';
+
+
+/**
+ * The name of the global variable which holds the value to be returned if
+ * context evaluation results in an error. 
+ * Use JsEvalContext.setGlobal(GLOB_default, value) to set this.
+ */
+var GLOB_default = '$default';
+
+
+/**
+ * Un-inlined literals, to avoid object creation in IE6. TODO(mesch):
+ * So far, these are only used here, but we could use them thoughout
+ * the code and thus move them to constants.js.
+ */
+var CHAR_colon = ':';
+var REGEXP_semicolon = /\s*;\s*/;
+
+
+/**
+ * See constructor_()
+ * @param {Object|null} opt_data
+ * @param {Object} opt_parent
+ * @constructor
+ */
+function JsEvalContext(opt_data, opt_parent) {
+  this.constructor_.apply(this, arguments);
+}
+
+/**
+ * Context for processing a jstemplate. The context contains a context
+ * object, whose properties can be referred to in jstemplate
+ * expressions, and it holds the locally defined variables.
+ *
+ * @param {Object|null} opt_data The context object. Null if no context.
+ *
+ * @param {Object} opt_parent The parent context, from which local
+ * variables are inherited. Normally the context object of the parent
+ * context is the object whose property the parent object is. Null for the
+ * context of the root object.
+ */
+JsEvalContext.prototype.constructor_ = function(opt_data, opt_parent) {
+  var me = this;
+
+  /**
+   * The context for variable definitions in which the jstemplate
+   * expressions are evaluated. Other than for the local context,
+   * which replaces the parent context, variable definitions of the
+   * parent are inherited. The special variable $this points to data_.
+   *
+   * If this instance is recycled from the cache, then the property is
+   * already initialized.
+   *
+   * @type {Object}
+   */
+  if (!me.vars_) {
+    me.vars_ = {};
+  }
+  if (opt_parent) {
+    copyProperties(me.vars_, opt_parent.vars_);
+  } else {
+    copyProperties(me.vars_, JsEvalContext.globals_);
+  }
+
+  /**
+   * The current context object is assigned to the special variable
+   * $this so it is possible to use it in expressions.
+   * @type Object
+   */
+  me.vars_[VAR_this] = opt_data;
+
+  /**
+   * The entire context structure is exposed as a variable so it can be
+   * passed to javascript invocations through jseval.
+   */
+  me.vars_[VAR_context] = me;
+
+  /**
+   * The local context of the input data in which the jstemplate
+   * expressions are evaluated. Notice that this is usually an Object,
+   * but it can also be a scalar value (and then still the expression
+   * $this can be used to refer to it). Notice this can even be value,
+   * undefined or null. Hence, we have to protect jsexec() from using
+   * undefined or null, yet we want $this to reflect the true value of
+   * the current context. Thus we assign the original value to $this,
+   * above, but for the expression context we replace null and
+   * undefined by the empty string.
+   *
+   * @type {Object|null}
+   */
+  me.data_ = getDefaultObject(opt_data, STRING_empty);
+
+  if (!opt_parent) {
+    me.vars_[VAR_top] = me.data_;
+  }
+};
+
+
+/**
+ * A map of globally defined symbols. Every instance of JsExprContext
+ * inherits them in its vars_.
+ * @type Object
+ */
+JsEvalContext.globals_ = {}
+
+
+/**
+ * Sets a global symbol. It will be available like a variable in every
+ * JsEvalContext instance. This is intended mainly to register
+ * immutable global objects, such as functions, at load time, and not
+ * to add global data at runtime. I.e. the same objections as to
+ * global variables in general apply also here. (Hence the name
+ * "global", and not "global var".)
+ * @param {string} name
+ * @param {Object|null} value
+ */
+JsEvalContext.setGlobal = function(name, value) {
+  JsEvalContext.globals_[name] = value;
+};
+
+
+/**
+ * Set the default value to be returned if context evaluation results in an 
+ * error. (This can occur if a non-existent value was requested). 
+ */
+JsEvalContext.setGlobal(GLOB_default, null);
+
+
+/**
+ * A cache to reuse JsEvalContext instances. (IE6 perf)
+ *
+ * @type Array.<JsEvalContext>
+ */
+JsEvalContext.recycledInstances_ = [];
+
+
+/**
+ * A factory to create a JsEvalContext instance, possibly reusing
+ * one from recycledInstances_. (IE6 perf)
+ *
+ * @param {Object} opt_data
+ * @param {JsEvalContext} opt_parent
+ * @return {JsEvalContext}
+ */
+JsEvalContext.create = function(opt_data, opt_parent) {
+  if (jsLength(JsEvalContext.recycledInstances_) > 0) {
+    var instance = JsEvalContext.recycledInstances_.pop();
+    JsEvalContext.call(instance, opt_data, opt_parent);
+    return instance;
+  } else {
+    return new JsEvalContext(opt_data, opt_parent);
+  }
+};
+
+
+/**
+ * Recycle a used JsEvalContext instance, so we can avoid creating one
+ * the next time we need one. (IE6 perf)
+ *
+ * @param {JsEvalContext} instance
+ */
+JsEvalContext.recycle = function(instance) {
+  for (var i in instance.vars_) {
+    delete instance.vars_[i];
+  }
+  instance.data_ = null;
+  JsEvalContext.recycledInstances_.push(instance);
+};
+
+
+/**
+ * Executes a function created using jsEvalToFunction() in the context
+ * of vars, data, and template.
+ *
+ * @param {Function} exprFunction A javascript function created from
+ * a jstemplate attribute value.
+ *
+ * @param {Element} template DOM node of the template.
+ *
+ * @return {Object|null} The value of the expression from which
+ * exprFunction was created in the current js expression context and
+ * the context of template.
+ */
+JsEvalContext.prototype.jsexec = function(exprFunction, template) {
+  try {
+    return exprFunction.call(template, this.vars_, this.data_);
+  } catch (e) {
+    log('jsexec EXCEPTION: ' + e + ' at ' + template +
+        ' with ' + exprFunction);
+    return JsEvalContext.globals_[GLOB_default];
+  }
+};
+
+
+/**
+ * Clones the current context for a new context object. The cloned
+ * context has the data object as its context object and the current
+ * context as its parent context. It also sets the $index variable to
+ * the given value. This value usually is the position of the data
+ * object in a list for which a template is instantiated multiply.
+ *
+ * @param {Object} data The new context object.
+ *
+ * @param {number} index Position of the new context when multiply
+ * instantiated. (See implementation of jstSelect().)
+ * 
+ * @param {number} count The total number of contexts that were multiply
+ * instantiated. (See implementation of jstSelect().)
+ *
+ * @return {JsEvalContext}
+ */
+JsEvalContext.prototype.clone = function(data, index, count) {
+  var ret = JsEvalContext.create(data, this);
+  ret.setVariable(VAR_index, index);
+  ret.setVariable(VAR_count, count);
+  return ret;
+};
+
+
+/**
+ * Binds a local variable to the given value. If set from jstemplate
+ * jsvalue expressions, variable names must start with $, but in the
+ * API they only have to be valid javascript identifier.
+ *
+ * @param {string} name
+ *
+ * @param {Object?} value
+ */
+JsEvalContext.prototype.setVariable = function(name, value) {
+  this.vars_[name] = value;
+};
+
+
+/**
+ * Returns the value bound to the local variable of the given name, or
+ * undefined if it wasn't set. There is no way to distinguish a
+ * variable that wasn't set from a variable that was set to
+ * undefined. Used mostly for testing.
+ *
+ * @param {string} name
+ *
+ * @return {Object?} value
+ */
+JsEvalContext.prototype.getVariable = function(name) {
+  return this.vars_[name];
+};
+
+
+/**
+ * Evaluates a string expression within the scope of this context
+ * and returns the result.
+ *
+ * @param {string} expr A javascript expression
+ * @param {Element} opt_template An optional node to serve as "this"
+ *
+ * @return {Object?} value
+ */
+JsEvalContext.prototype.evalExpression = function(expr, opt_template) {
+  var exprFunction = jsEvalToFunction(expr);
+  return this.jsexec(exprFunction, opt_template);
+};
+
+
+/**
+ * Uninlined string literals for jsEvalToFunction() (IE6 perf).
+ */
+var STRING_a = 'a_';
+var STRING_b = 'b_';
+var STRING_with = 'with (a_) with (b_) return ';
+
+
+/**
+ * Cache for jsEvalToFunction results.
+ * @type Object
+ */
+JsEvalContext.evalToFunctionCache_ = {};
+
+
+/**
+ * Evaluates the given expression as the body of a function that takes
+ * vars and data as arguments. Since the resulting function depends
+ * only on expr, we cache the result so we save some Function
+ * invocations, and some object creations in IE6.
+ *
+ * @param {string} expr A javascript expression.
+ *
+ * @return {Function} A function that returns the value of expr in the
+ * context of vars and data.
+ */
+function jsEvalToFunction(expr) {
+  if (!JsEvalContext.evalToFunctionCache_[expr]) {
+    try {
+      JsEvalContext.evalToFunctionCache_[expr] =
+        new Function(STRING_a, STRING_b, STRING_with + expr);
+    } catch (e) {
+      log('jsEvalToFunction (' + expr + ') EXCEPTION ' + e);
+    }
+  }
+  return JsEvalContext.evalToFunctionCache_[expr];
+}
+
+
+/**
+ * Evaluates the given expression to itself. This is meant to pass
+ * through string attribute values.
+ *
+ * @param {string} expr
+ *
+ * @return {string}
+ */
+function jsEvalToSelf(expr) {
+  return expr;
+}
+
+
+/**
+ * Parses the value of the jsvalues attribute in jstemplates: splits
+ * it up into a map of labels and expressions, and creates functions
+ * from the expressions that are suitable for execution by
+ * JsEvalContext.jsexec(). All that is returned as a flattened array
+ * of pairs of a String and a Function.
+ *
+ * @param {string} expr
+ *
+ * @return {Array}
+ */
+function jsEvalToValues(expr) {
+  var ret = [];
+  var values = expr.split(REGEXP_semicolon);
+  for (var i = 0, I = jsLength(values); i < I; ++i) {
+    var colon = values[i].indexOf(CHAR_colon);
+    if (colon < 0) {
+      continue;
+    }
+    var label = stringTrim(values[i].substr(0, colon));
+    var value = jsEvalToFunction(values[i].substr(colon + 1));
+    ret.push(label, value);
+  }
+  return ret;
+}
+
+
+/**
+ * Parses the value of the jseval attribute of jstemplates: splits it
+ * up into a list of expressions, and creates functions from the
+ * expressions that are suitable for execution by
+ * JsEvalContext.jsexec(). All that is returned as an Array of
+ * Function.
+ *
+ * @param {string} expr
+ *
+ * @return {Array.<Function>}
+ */
+function jsEvalToExpressions(expr) {
+  var ret = [];
+  var values = expr.split(REGEXP_semicolon);
+  for (var i = 0, I = jsLength(values); i < I; ++i) {
+    if (values[i]) {
+      var value = jsEvalToFunction(values[i]);
+      ret.push(value);
+    }
+  }
+  return ret;
+}
+/**
+ * Author: Steffen Meschkat <mesch@google.com>
+ *
  * @fileoverview A simple formatter to project JavaScript data into
  * HTML templates. The template is edited in place. I.e. in order to
  * instantiate a template, clone it from the DOM first, and then
  * process the cloned template. This allows for updating of templates:
  * If the templates is processed again, changed values are merely
  * updated.
  *
- * NOTE: IE DOM doesn't have importNode().
+ * NOTE(mesch): IE DOM doesn't have importNode().
  *
- * NOTE: The property name "length" must not be used in input
+ * NOTE(mesch): The property name "length" must not be used in input
  * data, see comment in jstSelect_().
  */
 
 
 /**
  * Names of jstemplate attributes. These attributes are attached to
  * normal HTML elements and bind expression context data to the HTML
  * fragment that is used as template.
  */
 var ATT_select = 'jsselect';
 var ATT_instance = 'jsinstance';
 var ATT_display = 'jsdisplay';
 var ATT_values = 'jsvalues';
+var ATT_vars = 'jsvars';
 var ATT_eval = 'jseval';
 var ATT_transclude = 'transclude';
 var ATT_content = 'jscontent';
-
-
-/**
- * Names of special variables defined by the jstemplate evaluation
- * context. These can be used in js expression in jstemplate
- * attributes.
- */
-var VAR_index = '$index';
-var VAR_this = '$this';
-
-
-/**
- * Context for processing a jstemplate. The context contains a context
- * object, whose properties can be referred to in jstemplate
- * expressions, and it holds the locally defined variables.
- *
- * @param {Object} opt_data The context object. Null if no context.
- *
- * @param {Object} opt_parent The parent context, from which local
- * variables are inherited. Normally the context object of the parent
- * context is the object whose property the parent object is. Null for the
- * context of the root object.
- *
- * @constructor
- */
-function JsExprContext(opt_data, opt_parent) {
-  var me = this;
-
-  /**
-   * The local context of the input data in which the jstemplate
-   * expressions are evaluated. Notice that this is usually an Object,
-   * but it can also be a scalar value (and then still the expression
-   * $this can be used to refer to it). Notice this can be a scalar
-   * value, including undefined.
-   *
-   * @type {Object}
-   */
-  me.data_ = opt_data;
-
-  /**
-   * The context for variable definitions in which the jstemplate
-   * expressions are evaluated. Other than for the local context,
-   * which replaces the parent context, variable definitions of the
-   * parent are inherited. The special variable $this points to data_.
-   *
-   * @type {Object}
-   */
-  me.vars_ = {};
-  if (opt_parent) {
-    copyProperties(me.vars_, opt_parent.vars_);
-  }
-  this.vars_[VAR_this] = me.data_;
-}
-
-
-/**
- * Evaluates the given expression in the context of the current
- * context object and the current local variables.
- *
- * @param {String} expr A javascript expression.
- *
- * @param {Element} template DOM node of the template.
- *
- * @return The value of that expression.
- */
-JsExprContext.prototype.jseval = function(expr, template) {
-  with (this.vars_) {
-    with (this.data_) {
-      try {
-        return (function() {
-          return eval('[' + expr + '][0]');
-        }).call(template);
-      } catch (e) {
-        return null;
-      }
-    }
-  }
-}
-
-
-/**
- * Clones the current context for a new context object. The cloned
- * context has the data object as its context object and the current
- * context as its parent context. It also sets the $index variable to
- * the given value. This value usually is the position of the data
- * object in a list for which a template is instantiated multiply.
- *
- * @param {Object} data The new context object.
- *
- * @param {Number} index Position of the new context when multiply
- * instantiated. (See implementation of jstSelect().)
- *
- * @return {JsExprContext}
- */
-JsExprContext.prototype.clone = function(data, index) {
-  var ret = new JsExprContext(data, this);
-  ret.setVariable(VAR_index, index);
-  if (this.resolver_) {
-    ret.setSubTemplateResolver(this.resolver_);
-  }
-  return ret;
-}
-
-
-/**
- * Binds a local variable to the given value. If set from jstemplate
- * jsvalue expressions, variable names must start with $, but in the
- * API they only have to be valid javascript identifier.
- *
- * @param {String} name
- *
- * @param {Object} value
- */
-JsExprContext.prototype.setVariable = function(name, value) {
-  this.vars_[name] = value;
-}
-
-
-/**
- * Sets the function used to resolve the values of the transclude
- * attribute into DOM nodes. By default, this is jstGetTemplate(). The
- * value set here is inherited by clones of this context.
- *
- * @param {Function} resolver The function used to resolve transclude
- * ids into a DOM node of a subtemplate. The DOM node returned by this
- * function will be inserted into the template instance being
- * processed. Thus, the resolver function must instantiate the
- * subtemplate as necessary.
- */
-JsExprContext.prototype.setSubTemplateResolver = function(resolver) {
-  this.resolver_ = resolver;
-}
-
-
-/**
- * Resolves a sub template from an id. Used to process the transclude
- * attribute. If a resolver function was set using
- * setSubTemplateResolver(), it will be used, otherwise
- * jstGetTemplate().
- *
- * @param {String} id The id of the sub template.
- *
- * @return {Node} The root DOM node of the sub template, for direct
- * insertion into the currently processed template instance.
- */
-JsExprContext.prototype.getSubTemplate = function(id) {
-  return (this.resolver_ || jstGetTemplate).call(this, id);
-}
+var ATT_skip = 'jsskip';
+
+
+/**
+ * Name of the attribute that caches a reference to the parsed
+ * template processing attribute values on a template node.
+ */
+var ATT_jstcache = 'jstcache';
+
+
+/**
+ * Name of the property that caches the parsed template processing
+ * attribute values on a template node.
+ */
+var PROP_jstcache = '__jstcache';
+
+
+/**
+ * ID of the element that contains dynamically loaded jstemplates.
+ */
+var STRING_jsts = 'jsts';
+
+
+/**
+ * Un-inlined string literals, to avoid object creation in
+ * IE6.
+ */
+var CHAR_asterisk = '*';
+var CHAR_dollar = '$';
+var CHAR_period = '.';
+var CHAR_ampersand = '&';
+var STRING_div = 'div';
+var STRING_id = 'id';
+var STRING_asteriskzero = '*0';
+var STRING_zero = '0';
 
 
 /**
  * HTML template processor. Data values are bound to HTML templates
  * using the attributes transclude, jsselect, jsdisplay, jscontent,
  * jsvalues. The template is modifed in place. The values of those
  * attributes are JavaScript expressions that are evaluated in the
  * context of the data object fragment.
  *
- * @param {JsExprContext} context Context created from the input data
+ * @param {JsEvalContext} context Context created from the input data
  * object.
  *
  * @param {Element} template DOM node of the template. This will be
  * processed in place. After processing, it will still be a valid
  * template that, if processed again with the same data, will remain
  * unchanged.
- */
-function jstProcess(context, template) {
-  var processor = new JstProcessor();
-  processor.run_([ processor, processor.jstProcess_, context, template ]);
+ *
+ * @param {boolean} opt_debugging Optional flag to collect debugging
+ *     information while processing the template.  Only takes effect
+ *     in MAPS_DEBUG.
+ */
+function jstProcess(context, template, opt_debugging) {
+  var processor = new JstProcessor;
+  JstProcessor.prepareTemplate_(template);
+
+  /**
+   * Caches the document of the template node, so we don't have to
+   * access it through ownerDocument.
+   * @type Document
+   */
+  processor.document_ = ownerDocument(template);
+
+  processor.run_(bindFully(processor, processor.jstProcessOuter_,
+                           context, template));
 }
 
 
 /**
- * Internal class used by jstemplates to maintain context.
- * NOTE: This is necessary to process deep templates in Safari
- * which has a relatively shallow stack.
+ * Internal class used by jstemplates to maintain context.  This is
+ * necessary to process deep templates in Safari which has a
+ * relatively shallow maximum recursion depth of 100.
  * @class
+ * @constructor
  */
 function JstProcessor() {
 }
 
 
 /**
- * Runs the state machine, beginning with function "start".
- *
- * @param {Array} start The first function to run, in the form
- * [object, method, args ...]
- */
-JstProcessor.prototype.run_ = function(start) {
+ * Counter to generate node ids. These ids will be stored in
+ * ATT_jstcache and be used to lookup the preprocessed js attributes
+ * from the jstcache_. The id is stored in an attribute so it
+ * suvives cloneNode() and thus cloned template nodes can share the
+ * same cache entry.
+ * @type number
+ */
+JstProcessor.jstid_ = 0;
+
+
+/**
+ * Map from jstid to processed js attributes.
+ * @type Object
+ */
+JstProcessor.jstcache_ = {};
+
+/**
+ * The neutral cache entry. Used for all nodes that don't have any
+ * jst attributes. We still set the jsid attribute on those nodes so
+ * we can avoid to look again for all the other jst attributes that
+ * aren't there. Remember: not only the processing of the js
+ * attribute values is expensive and we thus want to cache it. The
+ * access to the attributes on the Node in the first place is
+ * expensive too.
+ */
+JstProcessor.jstcache_[0] = {};
+
+
+/**
+ * Map from concatenated attribute string to jstid.
+ * The key is the concatenation of all jst atributes found on a node
+ * formatted as "name1=value1&name2=value2&...", in the order defined by
+ * JST_ATTRIBUTES. The value is the id of the jstcache_ entry that can
+ * be used for this node. This allows the reuse of cache entries in cases
+ * when a cached entry already exists for a given combination of attribute
+ * values. (For example when two different nodes in a template share the same
+ * JST attributes.)
+ * @type Object
+ */
+JstProcessor.jstcacheattributes_ = {};
+
+
+/**
+ * Map for storing temporary attribute values in prepareNode_() so they don't
+ * have to be retrieved twice. (IE6 perf)
+ * @type Object
+ */
+JstProcessor.attributeValues_ = {};
+
+
+/**
+ * A list for storing non-empty attributes found on a node in prepareNode_().
+ * The array is global since it can be reused - this way there is no need to
+ * construct a new array object for each invocation. (IE6 perf)
+ * @type Array
+ */
+JstProcessor.attributeList_ = [];
+
+
+/**
+ * Prepares the template: preprocesses all jstemplate attributes.
+ *
+ * @param {Element} template
+ */
+JstProcessor.prepareTemplate_ = function(template) {
+  if (!template[PROP_jstcache]) {
+    domTraverseElements(template, function(node) {
+      JstProcessor.prepareNode_(node);
+    });
+  }
+};
+
+
+/**
+ * A list of attributes we use to specify jst processing instructions,
+ * and the functions used to parse their values.
+ *
+ * @type Array.<Array>
+ */
+var JST_ATTRIBUTES = [
+    [ ATT_select, jsEvalToFunction ],
+    [ ATT_display, jsEvalToFunction ],
+    [ ATT_values, jsEvalToValues ],
+    [ ATT_vars, jsEvalToValues ],
+    [ ATT_eval, jsEvalToExpressions ],
+    [ ATT_transclude, jsEvalToSelf ],
+    [ ATT_content, jsEvalToFunction ],
+    [ ATT_skip, jsEvalToFunction ]
+];
+
+
+/**
+ * Prepares a single node: preprocesses all template attributes of the
+ * node, and if there are any, assigns a jsid attribute and stores the
+ * preprocessed attributes under the jsid in the jstcache.
+ *
+ * @param {Element} node
+ *
+ * @return {Object} The jstcache entry. The processed jst attributes
+ * are properties of this object. If the node has no jst attributes,
+ * returns an object with no properties (the jscache_[0] entry).
+ */
+JstProcessor.prepareNode_ = function(node) {
+  if (node[PROP_jstcache]) {
+    return node[PROP_jstcache];
+  }
+
+
+  var jstid = domGetAttribute(node, ATT_jstcache);
+  if (jstid != null) {
+    return node[PROP_jstcache] = JstProcessor.jstcache_[jstid];
+  }
+
+  var attributeValues = JstProcessor.attributeValues_;
+  var attributeList = JstProcessor.attributeList_;
+  attributeList.length = 0;
+
+  for (var i = 0, I = jsLength(JST_ATTRIBUTES); i < I; ++i) {
+    var name = JST_ATTRIBUTES[i][0];
+    var value = domGetAttribute(node, name);
+    attributeValues[name] = value;
+    if (value != null) {
+      attributeList.push(name + "=" + value);
+    }
+  }
+
+  if (attributeList.length == 0) {
+    domSetAttribute(node, ATT_jstcache, STRING_zero);
+    return node[PROP_jstcache] = JstProcessor.jstcache_[0];
+  }
+
+  var attstring = attributeList.join(CHAR_ampersand);
+  if (jstid = JstProcessor.jstcacheattributes_[attstring]) {
+    domSetAttribute(node, ATT_jstcache, jstid);
+    return node[PROP_jstcache] = JstProcessor.jstcache_[jstid];
+  }
+
+  var jstcache = {};
+  for (var i = 0, I = jsLength(JST_ATTRIBUTES); i < I; ++i) {
+    var att = JST_ATTRIBUTES[i];
+    var name = att[0];
+    var parse = att[1];
+    var value = attributeValues[name];
+    if (value != null) {
+      jstcache[name] = parse(value);
+    }
+  }
+
+  jstid = STRING_empty + ++JstProcessor.jstid_;
+  domSetAttribute(node, ATT_jstcache, jstid);
+  JstProcessor.jstcache_[jstid] = jstcache;
+  JstProcessor.jstcacheattributes_[attstring] = jstid;
+
+  return node[PROP_jstcache] = jstcache;
+};
+
+
+/**
+ * Runs the given function in our state machine.
+ *
+ * It's informative to view the set of all function calls as a tree:
+ * - nodes are states
+ * - edges are state transitions, implemented as calls to the pending
+ *   functions in the stack.
+ *   - pre-order function calls are downward edges (recursion into call).
+ *   - post-order function calls are upward edges (return from call).
+ * - leaves are nodes which do not recurse.
+ * We represent the call tree as an array of array of calls, indexed as
+ * stack[depth][index].  Here [depth] indexes into the call stack, and
+ * [index] indexes into the call queue at that depth.  We require a call
+ * queue so that a node may branch to more than one child
+ * (which will be called serially), typically due to a loop structure.
+ *
+ * @param {Function} f The first function to run.
+ */
+JstProcessor.prototype.run_ = function(f) {
   var me = this;
 
-  me.queue_ = [ start ];
-  while (jsLength(me.queue_)) {
-    var f = me.queue_.shift();
-    f[1].apply(f[0], f.slice(2));
-  }
-}
-
-
-/**
- * Appends a function to be called later.
- * Analogous to calling that function on a subsequent line, or a subsequent
- * iteration of a loop.
- *
- * @param {Array} f  A function in the form [object, method, args ...]
- */
-JstProcessor.prototype.enqueue_ = function(f) {
-  this.queue_.push(f);
-}
-
-
-/**
- * Implements internals of jstProcess.
- *
- * @param {JsExprContext} context
+  /**
+   * A stack of queues of pre-order calls.
+   * The inner arrays (constituent queues) are structured as
+   * [ arg2, arg1, method, arg2, arg1, method, ...]
+   * ie. a flattened array of methods with 2 arguments, in reverse order
+   * for efficient push/pop.
+   *
+   * The outer array is a stack of such queues.
+   *
+   * @type Array.<Array>
+   */
+  var calls = me.calls_ = [];
+
+  /**
+   * The index into the queue for each depth. NOTE: Alternative would
+   * be to maintain the queues in reverse order (popping off of the
+   * end) but the repeated calls to .pop() consumed 90% of this
+   * function's execution time.
+   * @type Array.<number>
+   */
+  var queueIndices = me.queueIndices_ = [];
+
+  /**
+   * A pool of empty arrays.  Minimizes object allocation for IE6's benefit.
+   * @type Array.<Array>
+   */
+  var arrayPool = me.arrayPool_ = [];
+
+  f();
+  var queue, queueIndex;
+  var method, arg1, arg2;
+  var temp;
+  while (calls.length) {
+    queue = calls[calls.length - 1];
+    queueIndex = queueIndices[queueIndices.length - 1];
+    if (queueIndex >= queue.length) {
+      me.recycleArray_(calls.pop());
+      queueIndices.pop();
+      continue;
+    }
+
+    method = queue[queueIndex++];
+    arg1 = queue[queueIndex++];
+    arg2 = queue[queueIndex++];
+    queueIndices[queueIndices.length - 1] = queueIndex;
+    method.call(me, arg1, arg2);
+  }
+};
+
+
+/**
+ * Pushes one or more functions onto the stack.  These will be run in sequence,
+ * interspersed with any recursive calls that they make.
+ *
+ * This method takes ownership of the given array!
+ *
+ * @param {Array} args Array of method calls structured as
+ *     [ method, arg1, arg2, method, arg1, arg2, ... ]
+ */
+JstProcessor.prototype.push_ = function(args) {
+  this.calls_.push(args);
+  this.queueIndices_.push(0);
+};
+
+
+/**
+ * Enable/disable debugging.
+ * @param {boolean} debugging New state
+ */
+JstProcessor.prototype.setDebugging = function(debugging) {
+};
+
+
+JstProcessor.prototype.createArray_ = function() {
+  if (this.arrayPool_.length) {
+    return this.arrayPool_.pop();
+  } else {
+    return [];
+  }
+};
+
+
+JstProcessor.prototype.recycleArray_ = function(array) {
+  arrayClear(array);
+  this.arrayPool_.push(array);
+};
+
+/**
+ * Implements internals of jstProcess. This processes the two
+ * attributes transclude and jsselect, which replace or multiply
+ * elements, hence the name "outer". The remainder of the attributes
+ * is processed in jstProcessInner_(), below. That function
+ * jsProcessInner_() only processes attributes that affect an existing
+ * node, but doesn't create or destroy nodes, hence the name
+ * "inner". jstProcessInner_() is called through jstSelect_() if there
+ * is a jsselect attribute (possibly for newly created clones of the
+ * current template node), or directly from here if there is none.
+ *
+ * @param {JsEvalContext} context
  *
  * @param {Element} template
  */
-JstProcessor.prototype.jstProcess_ = function(context, template) {
+JstProcessor.prototype.jstProcessOuter_ = function(context, template) {
   var me = this;
 
-  var transclude = domGetAttribute(template, ATT_transclude);
+  var jstAttributes = me.jstAttributes_(template);
+
+  var transclude = jstAttributes[ATT_transclude];
   if (transclude) {
-    var tr = context.getSubTemplate(transclude);
+    var tr = jstGetTemplate(transclude);
     if (tr) {
       domReplaceChild(tr, template);
-      me.enqueue_([ me, me.jstProcess_, context, tr ]);
+      var call = me.createArray_();
+      call.push(me.jstProcessOuter_, context, tr);
+      me.push_(call);
     } else {
       domRemoveNode(template);
     }
     return;
   }
 
-  var select = domGetAttribute(template, ATT_select);
+  var select = jstAttributes[ATT_select];
   if (select) {
     me.jstSelect_(context, template, select);
-    return;
-  }
-
-  var display = domGetAttribute(template, ATT_display);
+  } else {
+    me.jstProcessInner_(context, template);
+  }
+};
+
+
+/**
+ * Implements internals of jstProcess. This processes all attributes
+ * except transclude and jsselect. It is called either from
+ * jstSelect_() for nodes that have a jsselect attribute so that the
+ * jsselect attribute will not be processed again, or else directly
+ * from jstProcessOuter_(). See the comment on jstProcessOuter_() for
+ * an explanation of the name.
+ *
+ * @param {JsEvalContext} context
+ *
+ * @param {Element} template
+ */
+JstProcessor.prototype.jstProcessInner_ = function(context, template) {
+  var me = this;
+
+  var jstAttributes = me.jstAttributes_(template);
+
+  var display = jstAttributes[ATT_display];
   if (display) {
-    if (!context.jseval(display, template)) {
+    var shouldDisplay = context.jsexec(display, template);
+    if (!shouldDisplay) {
       displayNone(template);
       return;
     }
-
     displayDefault(template);
   }
 
-
-  var values = domGetAttribute(template, ATT_values);
+  var values = jstAttributes[ATT_vars];
+  if (values) {
+    me.jstVars_(context, template, values);
+  }
+
+  values = jstAttributes[ATT_values];
   if (values) {
     me.jstValues_(context, template, values);
   }
 
-  var expressions = domGetAttribute(template, ATT_eval);
+  var expressions = jstAttributes[ATT_eval];
   if (expressions) {
-    foreach(expressions.split(/\s*;\s*/), function(expression) {
-      expression = stringTrim(expression);
-      if (jsLength(expression)) {
-        context.jseval(expression, template);
-      }
-    });
-  }
-
-  var content = domGetAttribute(template, ATT_content);
+    for (var i = 0, I = jsLength(expressions); i < I; ++i) {
+      context.jsexec(expressions[i], template);
+    }
+  }
+
+  var skip = jstAttributes[ATT_skip];
+  if (skip) {
+    var shouldSkip = context.jsexec(skip, template);
+    if (shouldSkip) return;
+  }
+
+  var content = jstAttributes[ATT_content];
   if (content) {
     me.jstContent_(context, template, content);
 
   } else {
-    var childnodes = [];
-    for (var i = 0; i < jsLength(template.childNodes); ++i) {
-      if (template.childNodes[i].nodeType == DOM_ELEMENT_NODE) {
-      me.enqueue_(
-          [ me, me.jstProcess_, context, template.childNodes[i] ]);
+    var queue = me.createArray_();
+    for (var c = template.firstChild; c; c = c.nextSibling) {
+      if (c.nodeType == DOM_ELEMENT_NODE) {
+        queue.push(me.jstProcessOuter_, context, c);
       }
     }
-  }
-}
+    if (queue.length) me.push_(queue);
+  }
+};
 
 
 /**
  * Implements the jsselect attribute: evalutes the value of the
  * jsselect attribute in the current context, with the current
- * variable bindings (see JsExprContext.jseval()). If the value is an
+ * variable bindings (see JsEvalContext.jseval()). If the value is an
  * array, the current template node is multiplied once for every
  * element in the array, with the array element being the context
  * object. If the array is empty, or the value is undefined, then the
  * current template node is dropped. If the value is not an array,
  * then it is just made the context object.
  *
- * @param {JsExprContext} context The current evaluation context.
+ * @param {JsEvalContext} context The current evaluation context.
  *
  * @param {Element} template The currently processed node of the template.
  *
- * @param {String} select The javascript expression to evaluate.
- *
- * @param {Function} process The function to continue processing with.
+ * @param {Function} select The javascript expression to evaluate.
+ *
+ * @notypecheck FIXME(hmitchell): See OCL6434950. instance and value need
+ * type checks.
  */
 JstProcessor.prototype.jstSelect_ = function(context, template, select) {
   var me = this;
 
-  var value = context.jseval(select, template);
-  domRemoveAttribute(template, ATT_select);
+  var value = context.jsexec(select, template);
 
   var instance = domGetAttribute(template, ATT_instance);
-  var instance_last = false;
+
+  var instanceLast = false;
   if (instance) {
-    if (instance.charAt(0) == '*') {
+    if (instance.charAt(0) == CHAR_asterisk) {
       instance = parseInt10(instance.substr(1));
-      instance_last = true;
+      instanceLast = true;
     } else {
-      instance = parseInt10(instance);
-    }
-  }
-
-  var multiple = (value !== null &&
-                  typeof value == 'object' &&
-                  typeof value.length == 'number');
-  var multiple_empty = (multiple && value.length == 0);
+      instance = parseInt10(/** @type string */(instance));
+    }
+  }
+
+  var multiple = isArray(value);
+  var count = multiple ? jsLength(value) : 1;
+  var multipleEmpty = (multiple && count == 0);
 
   if (multiple) {
-    if (multiple_empty) {
+    if (multipleEmpty) {
       if (!instance) {
-        domSetAttribute(template, ATT_select, select);
-        domSetAttribute(template, ATT_instance, '*0');
+        domSetAttribute(template, ATT_instance, STRING_asteriskzero);
         displayNone(template);
       } else {
         domRemoveNode(template);
       }
 
     } else {
       displayDefault(template);
-      if (instance === null || instance === "" || instance === undefined ||
-          (instance_last && instance < jsLength(value) - 1)) {
-        var templatenodes = [];
-        var instances_start = instance || 0;
-        for (var i = instances_start + 1; i < jsLength(value); ++i) {
+      if (instance === null || instance === STRING_empty ||
+          (instanceLast && instance < count - 1)) {
+        var queue = me.createArray_();
+
+        var instancesStart = instance || 0;
+        var i, I, clone;
+        for (i = instancesStart, I = count - 1; i < I; ++i) {
           var node = domCloneNode(template);
-          templatenodes.push(node);
           domInsertBefore(node, template);
+
+          jstSetInstance(/** @type Element */(node), value, i);
+          clone = context.clone(value[i], i, count);
+
+          queue.push(me.jstProcessInner_, clone, node,
+                     JsEvalContext.recycle, clone, null);
+
         }
-        templatenodes.push(template);
-
-        for (var i = 0; i < jsLength(templatenodes); ++i) {
-          var ii = i + instances_start;
-          var v = value[ii];
-          var t = templatenodes[i];
-
-          me.enqueue_([ me, me.jstProcess_, context.clone(v, ii), t ]);
-          var instanceStr = (ii == jsLength(value) - 1 ? '*' : '') + ii;
-          me.enqueue_(
-              [ null, postProcessMultiple_, t, select, instanceStr ]);
-        }
-
-      } else if (instance < jsLength(value)) {
+        jstSetInstance(template, value, i);
+        clone = context.clone(value[i], i, count);
+        queue.push(me.jstProcessInner_, clone, template,
+                   JsEvalContext.recycle, clone, null);
+        me.push_(queue);
+      } else if (instance < count) {
         var v = value[instance];
 
-        me.enqueue_(
-            [me, me.jstProcess_, context.clone(v, instance), template]);
-        var instanceStr = (instance == jsLength(value) - 1 ? '*' : '')
-                          + instance;
-        me.enqueue_(
-            [ null, postProcessMultiple_, template, select, instanceStr ]);
+        jstSetInstance(template, value, instance);
+        var clone = context.clone(v, instance, count);
+        var queue = me.createArray_();
+        queue.push(me.jstProcessInner_, clone, template,
+                   JsEvalContext.recycle, clone, null);
+        me.push_(queue);
       } else {
         domRemoveNode(template);
       }
     }
   } else {
     if (value == null) {
-      domSetAttribute(template, ATT_select, select);
       displayNone(template);
     } else {
-      me.enqueue_(
-          [ me, me.jstProcess_, context.clone(value, 0), template ]);
-      me.enqueue_(
-          [ null, postProcessSingle_, template, select ]);
+      displayDefault(template);
+      var clone = context.clone(value, 0, 1);
+      var queue = me.createArray_();
+      queue.push(me.jstProcessInner_, clone, template,
+                 JsEvalContext.recycle, clone, null);
+      me.push_(queue);
     }
   }
-}
+};
 
 
 /**
- * Sets ATT_select and ATT_instance following recursion to jstProcess.
+ * Implements the jsvars attribute: evaluates each of the values and
+ * assigns them to variables in the current context. Similar to
+ * jsvalues, except that all values are treated as vars, independent
+ * of their names.
  *
- * @param {Element} template  The template
+ * @param {JsEvalContext} context Current evaluation context.
  *
- * @param {String} select  The jsselect string
+ * @param {Element} template Currently processed template node.
  *
- * @param {String} instanceStr  The new value for the jsinstance attribute
+ * @param {Array} values Processed value of the jsvalues attribute: a
+ * flattened array of pairs. The second element in the pair is a
+ * function that can be passed to jsexec() for evaluation in the
+ * current jscontext, and the first element is the variable name that
+ * the value returned by jsexec is assigned to.
  */
-function postProcessMultiple_(template, select, instanceStr) {
-  domSetAttribute(template, ATT_select, select);
-  domSetAttribute(template, ATT_instance, instanceStr);
-}
-
-
-/**
- * Sets ATT_select and makes the element visible following recursion to
- * jstProcess.
- *
- * @param {Element} template  The template
- *
- * @param {String} select  The jsselect string
- */
-function postProcessSingle_(template, select) {
-  domSetAttribute(template, ATT_select, select);
-  displayDefault(template);
-}
+JstProcessor.prototype.jstVars_ = function(context, template, values) {
+  for (var i = 0, I = jsLength(values); i < I; i += 2) {
+    var label = values[i];
+    var value = context.jsexec(values[i+1], template);
+    context.setVariable(label, value);
+  }
+};
 
 
 /**
  * Implements the jsvalues attribute: evaluates each of the values and
  * assigns them to variables in the current context (if the name
  * starts with '$', javascript properties of the current template node
  * (if the name starts with '.'), or DOM attributes of the current
  * template node (otherwise). Since DOM attribute values are always
  * strings, the value is coerced to string in the latter case,
  * otherwise it's the uncoerced javascript value.
  *
- * @param {JsExprContext} context Current evaluation context.
+ * @param {JsEvalContext} context Current evaluation context.
  *
  * @param {Element} template Currently processed template node.
  *
- * @param {String} valuesStr Value of the jsvalues attribute to be
- * processed.
+ * @param {Array} values Processed value of the jsvalues attribute: a
+ * flattened array of pairs. The second element in the pair is a
+ * function that can be passed to jsexec() for evaluation in the
+ * current jscontext, and the first element is the label that
+ * determines where the value returned by jsexec is assigned to.
  */
-JstProcessor.prototype.jstValues_ = function(context, template, valuesStr) {
-  var values = valuesStr.split(/\s*;\s*/);
-  for (var i = 0; i < jsLength(values); ++i) {
-    var colon = values[i].indexOf(':');
-    if (colon < 0) {
-      continue;
-    }
-    var label = stringTrim(values[i].substr(0, colon));
-    var value = context.jseval(values[i].substr(colon + 1), template);
+JstProcessor.prototype.jstValues_ = function(context, template, values) {
+  for (var i = 0, I = jsLength(values); i < I; i += 2) {
+    var label = values[i];
+    var value = context.jsexec(values[i+1], template);
 
-    if (label.charAt(0) == '$') {
+    if (label.charAt(0) == CHAR_dollar) {
       context.setVariable(label, value);
 
-    } else if (label.charAt(0) == '.') {
-      var nameSpaceLabel = label.substr(1).split('.');
+    } else if (label.charAt(0) == CHAR_period) {
+      var nameSpaceLabel = label.substr(1).split(CHAR_period);
       var nameSpaceObject = template;
       var nameSpaceDepth = jsLength(nameSpaceLabel);
       for (var j = 0, J = nameSpaceDepth - 1; j < J; ++j) {
         var jLabel = nameSpaceLabel[j];
         if (!nameSpaceObject[jLabel]) {
           nameSpaceObject[jLabel] = {};
         }
         nameSpaceObject = nameSpaceObject[jLabel];
       }
       nameSpaceObject[nameSpaceLabel[nameSpaceDepth - 1]] = value;
+
     } else if (label) {
-      if (typeof value == 'boolean') {
+      if (typeof value == TYPE_boolean) {
         if (value) {
           domSetAttribute(template, label, label);
         } else {
           domRemoveAttribute(template, label);
         }
       } else {
-        domSetAttribute(template, label, '' + value);
+        domSetAttribute(template, label, STRING_empty + value);
       }
     }
   }
-}
+};
 
 
 /**
  * Implements the jscontent attribute. Evalutes the expression in
  * jscontent in the current context and with the current variables,
  * and assigns its string value to the content of the current template
  * node.
  *
- * @param {JsExprContext} context Current evaluation context.
+ * @param {JsEvalContext} context Current evaluation context.
  *
  * @param {Element} template Currently processed template node.
  *
- * @param {String} content Value of the jscontent attribute to be
- * processed.
+ * @param {Function} content Processed value of the jscontent
+ * attribute.
  */
 JstProcessor.prototype.jstContent_ = function(context, template, content) {
-  var value = '' + context.jseval(content, template);
+  var value = STRING_empty + context.jsexec(content, template);
   if (template.innerHTML == value) {
     return;
   }
   while (template.firstChild) {
     domRemoveNode(template.firstChild);
   }
-  var t = domCreateTextNode(ownerDocument(template), value);
+  var t = domCreateTextNode(this.document_, value);
   domAppendChild(template, t);
-}
+};
+
+
+/**
+ * Caches access to and parsing of template processing attributes. If
+ * domGetAttribute() is called every time a template attribute value
+ * is used, it takes more than 10% of the time.
+ *
+ * @param {Element} template A DOM element node of the template.
+ *
+ * @return {Object} A javascript object that has all js template
+ * processing attribute values of the node as properties.
+ */
+JstProcessor.prototype.jstAttributes_ = function(template) {
+  if (template[PROP_jstcache]) {
+    return template[PROP_jstcache];
+  }
+
+  var jstid = domGetAttribute(template, ATT_jstcache);
+  if (jstid) {
+    return template[PROP_jstcache] = JstProcessor.jstcache_[jstid];
+  }
+
+  return JstProcessor.prepareNode_(template);
+};
 
 
 /**
  * Helps to implement the transclude attribute, and is the initial
  * call to get hold of a template from its ID.
  *
- * @param {String} name The ID of the HTML element used as template.
- *
- * @returns {Element} The DOM node of the template. (Only element
- * nodes can be found by ID, hence it's a Element.)
- */
-function jstGetTemplate(name) {
-  var section = domGetElementById(document, name);
+ * If the ID is not present in the DOM, and opt_loadHtmlFn is specified, this
+ * function will call that function and add the result to the DOM, before
+ * returning the template.
+ *
+ * @param {string} name The ID of the HTML element used as template.
+ * @param {Function} opt_loadHtmlFn A function which, when called, will return
+ *   HTML that contains an element whose ID is 'name'.
+ *
+ * @return {Element|null} The DOM node of the template. (Only element nodes
+ * can be found by ID, hence it's a Element.)
+ */
+function jstGetTemplate(name, opt_loadHtmlFn) {
+  var doc = document;
+  var section;
+  if (opt_loadHtmlFn) {
+    section = jstLoadTemplateIfNotPresent(doc, name, opt_loadHtmlFn);
+  } else {
+    section = domGetElementById(doc, name);
+  }
   if (section) {
-    var ret = domCloneNode(section);
-    domRemoveAttribute(ret, 'id');
+    JstProcessor.prepareTemplate_(section);
+    var ret = domCloneElement(section);
+    domRemoveAttribute(ret, STRING_id);
     return ret;
   } else {
     return null;
   }
 }
 
+/**
+ * This function is the same as 'jstGetTemplate' but, if the template
+ * does not exist, throw an exception.
+ *
+ * @param {string} name The ID of the HTML element used as template.
+ * @param {Function} opt_loadHtmlFn A function which, when called, will return
+ *   HTML that contains an element whose ID is 'name'.
+ *
+ * @return {Element} The DOM node of the template. (Only element nodes
+ * can be found by ID, hence it's a Element.)
+ */
+function jstGetTemplateOrDie(name, opt_loadHtmlFn) {
+  var x = jstGetTemplate(name, opt_loadHtmlFn);
+  check(x !== null);
+  return /** @type Element */(x);
+}
+
+
+/**
+ * If an element with id 'name' is not present in the document, call loadHtmlFn
+ * and insert the result into the DOM.
+ *
+ * @param {Document} doc
+ * @param {string} name
+ * @param {Function} loadHtmlFn A function that returns HTML to be inserted
+ * into the DOM.
+ * @param {string} opt_target The id of a DOM object under which to attach the
+ *   HTML once it's inserted.  An object with this id is created if it does not
+ *   exist.
+ * @return {Element} The node whose id is 'name'
+ */
+function jstLoadTemplateIfNotPresent(doc, name, loadHtmlFn, opt_target) {
+  var section = domGetElementById(doc, name);
+  if (section) {
+    return section;
+  }
+  jstLoadTemplate_(doc, loadHtmlFn(), opt_target || STRING_jsts);
+  var section = domGetElementById(doc, name);
+  if (!section) {
+    log("Error: jstGetTemplate was provided with opt_loadHtmlFn, " +
+        "but that function did not provide the id '" + name + "'.");
+  }
+  return /** @type Element */(section);
+}
+
+
+/**
+ * Loads the given HTML text into the given document, so that
+ * jstGetTemplate can find it.
+ *
+ * We append it to the element identified by targetId, which is hidden.
+ * If it doesn't exist, it is created.
+ *
+ * @param {Document} doc The document to create the template in.
+ *
+ * @param {string} html HTML text to be inserted into the document.
+ *
+ * @param {string} targetId The id of a DOM object under which to attach the
+ *   HTML once it's inserted.  An object with this id is created if it does not
+ *   exist.
+ */
+function jstLoadTemplate_(doc, html, targetId) {
+  var existing_target = domGetElementById(doc, targetId);
+  var target;
+  if (!existing_target) {
+    target = domCreateElement(doc, STRING_div);
+    target.id = targetId;
+    displayNone(target);
+    positionAbsolute(target);
+    domAppendChild(doc.body, target);
+  } else {
+    target = existing_target;
+  }
+  var div = domCreateElement(doc, STRING_div);
+  target.appendChild(div);
+  div.innerHTML = html;
+}
+
+
+/**
+ * Sets the jsinstance attribute on a node according to its context.
+ *
+ * @param {Element} template The template DOM node to set the instance
+ * attribute on.
+ *
+ * @param {Array} values The current input context, the array of
+ * values of which the template node will render one instance.
+ *
+ * @param {number} index The index of this template node in values.
+ */
+function jstSetInstance(template, values, index) {
+  if (index == jsLength(values) - 1) {
+    domSetAttribute(template, ATT_instance, CHAR_asterisk + index);
+  } else {
+    domSetAttribute(template, ATT_instance, STRING_empty + index);
+  }
+}
+
+
+/**
+ * Log the current state.
+ * @param {string} caller An identifier for the caller of .log_.
+ * @param {Element} template The template node being processed.
+ * @param {Object} jstAttributeValues The jst attributes of the template node.
+ */
+JstProcessor.prototype.logState_ = function(
+    caller, template, jstAttributeValues) {
+};
+
+
+/**
+ * Retrieve the processing logs.
+ * @return {Array.<string>} The processing logs.
+ */
+JstProcessor.prototype.getLogs = function() {
+  return this.logs_;
+};
 window['jstGetTemplate'] = jstGetTemplate;
+window['JsEvalContext'] = JsEvalContext;
 window['jstProcess'] = jstProcess;
-window['JsExprContext'] = JsExprContext;
+})()