Sample sprucing part 2

chrome/test/data/extensions/samples/tabs/jstemplate_compiled.js

Index: chrome/test/data/extensions/samples/tabs/jstemplate_compiled.js
diff --git a/chrome/test/data/extensions/samples/tabs/jstemplate_compiled.js b/chrome/test/data/extensions/samples/tabs/jstemplate_compiled.js
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@@ -0,0 +1,1182 @@
+/**
+ * @fileoverview This file contains miscellaneous basic functionality.
+ *
+ */
+
+/**
+ * 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);
+  }
+
+  return element;
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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);
+}
+
+
+/**
+ * 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}
+ */
+function jsEval(expr) {
+  try {
+    return eval('[' + expr + '][0]');
+  } catch (e) {
+    return null;
+  }
+}
+
+
+/**
+ * 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}
+ */
+function jsExec(stmt) {
+  try {
+    eval(stmt);
+    return true;
+  } catch (e) {
+    return false;
+  }
+}
+
+
+/**
+ * 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.
+ *
+ * @param {String} expr
+ * @param {Object} context
+ * @return {Object|Null}
+ */
+function jsEvalWith(expr, context) {
+  try {
+    with (context) {
+      return eval('[' + expr + '][0]');
+    }
+  } catch (e) {
+    return null;
+  }
+}
+
+
+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;
+
+/**
+ * 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.
+ *
+ * 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 {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.
+ */
+function nodeGetElementById(node, elemId) {
+  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;
+      }
+    }
+  }
+  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.
+ */
+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.
+ */
+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.
+ */
+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 "".
+ *
+ * @param {Element} node  DOM element to query.
+ * @return {String}
+ */
+function domClassName(node) {
+  return node.className ? "" + node.className : "";
+}
+
+/**
+ * Adds a class name to the class attribute of the given node.
+ *
+ * @param {Element} node  DOM element to modify.
+ * @param {String} className  Class name to add.
+ */
+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(' ');
+  } else {
+    node.className = className;
+  }
+}
+
+/**
+ * Removes a class name from the class attribute of the given node.
+ *
+ * @param {Element} node  DOM element to modify.
+ * @param {String} className  Class name to remove.
+ */
+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);
+}
+
+/**
+ * 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.
+ *
+ * @param {Element} node  Parent element.
+ * @param {Node} child  Child node to remove.
+ * @return {Node}  Removed node.
+ */
+function domRemoveChild(node, child) {
+  return node.removeChild(child);
+}
+
+/**
+ * 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]);
+  }
+}
+
+/**
+ * Trim whitespace from begin and end of string.
+ *
+ * @see testStringTrim();
+ *
+ * @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.
+ */
+function stringTrimLeft(str) {
+  return str.replace(/^\s+/, "");
+}
+
+/**
+ * Trim whitespace from end of string.
+ *
+ * @see testStringTrimRight();
+ *
+ * @param {String} str  Input string.
+ * @return {String}  Trimmed string.
+ */
+function stringTrimRight(str) {
+  return str.replace(/\s+$/, "");
+}
+
+/**
+ * Jscompiler wrapper for parseInt() with base 10.
+ *
+ * @param {String} s String repersentation of a number.
+ *
+ * @return {Number} The integer contained in s, converted on base 10.
+ */
+function parseInt10(s) {
+  return parseInt(s, 10);
+}
+/**
+ * @fileoverview A simple formatter to project JavaScript data into
+ * HTML templates. The template is edited in place. I.e. in order to
+ * instantiate a template, clone it from the DOM first, and then
+ * process the cloned template. This allows for updating of templates:
+ * If the templates is processed again, changed values are merely
+ * updated.
+ *
+ * NOTE: IE DOM doesn't have importNode().
+ *
+ * NOTE: The property name "length" must not be used in input
+ * data, see comment in jstSelect_().
+ */
+
+
+/**
+ * Names of jstemplate attributes. These attributes are attached to
+ * normal HTML elements and bind expression context data to the HTML
+ * fragment that is used as template.
+ */
+var ATT_select = 'jsselect';
+var ATT_instance = 'jsinstance';
+var ATT_display = 'jsdisplay';
+var ATT_values = 'jsvalues';
+var ATT_eval = 'jseval';
+var ATT_transclude = 'transclude';
+var ATT_content = 'jscontent';
+
+
+/**
+ * Names of special variables defined by the jstemplate evaluation
+ * context. These can be used in js expression in jstemplate
+ * attributes.
+ */
+var VAR_index = '$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);
+}
+
+
+/**
+ * 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
+ * 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 ]);
+}
+
+
+/**
+ * Internal class used by jstemplates to maintain context.
+ * NOTE: This is necessary to process deep templates in Safari
+ * which has a relatively shallow stack.
+ * @class
+ */
+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) {
+  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
+ *
+ * @param {Element} template
+ */
+JstProcessor.prototype.jstProcess_ = function(context, template) {
+  var me = this;
+
+  var transclude = domGetAttribute(template, ATT_transclude);
+  if (transclude) {
+    var tr = context.getSubTemplate(transclude);
+    if (tr) {
+      domReplaceChild(tr, template);
+      me.enqueue_([ me, me.jstProcess_, context, tr ]);
+    } else {
+      domRemoveNode(template);
+    }
+    return;
+  }
+
+  var select = domGetAttribute(template, ATT_select);
+  if (select) {
+    me.jstSelect_(context, template, select);
+    return;
+  }
+
+  var display = domGetAttribute(template, ATT_display);
+  if (display) {
+    if (!context.jseval(display, template)) {
+      displayNone(template);
+      return;
+    }
+
+    displayDefault(template);
+  }
+
+
+  var values = domGetAttribute(template, ATT_values);
+  if (values) {
+    me.jstValues_(context, template, values);
+  }
+
+  var expressions = domGetAttribute(template, 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);
+  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] ]);
+      }
+    }
+  }
+}
+
+
+/**
+ * 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
+ * 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 {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.
+ */
+JstProcessor.prototype.jstSelect_ = function(context, template, select) {
+  var me = this;
+
+  var value = context.jseval(select, template);
+  domRemoveAttribute(template, ATT_select);
+
+  var instance = domGetAttribute(template, ATT_instance);
+  var instance_last = false;
+  if (instance) {
+    if (instance.charAt(0) == '*') {
+      instance = parseInt10(instance.substr(1));
+      instance_last = true;
+    } else {
+      instance = parseInt10(instance);
+    }
+  }
+
+  var multiple = (value !== null &&
+                  typeof value == 'object' &&
+                  typeof value.length == 'number');
+  var multiple_empty = (multiple && value.length == 0);
+
+  if (multiple) {
+    if (multiple_empty) {
+      if (!instance) {
+        domSetAttribute(template, ATT_select, select);
+        domSetAttribute(template, ATT_instance, '*0');
+        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) {
+          var node = domCloneNode(template);
+          templatenodes.push(node);
+          domInsertBefore(node, template);
+        }
+        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)) {
+        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 ]);
+      } 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 ]);
+    }
+  }
+}
+
+
+/**
+ * Sets ATT_select and ATT_instance following recursion to jstProcess.
+ *
+ * @param {Element} template  The template
+ *
+ * @param {String} select  The jsselect string
+ *
+ * @param {String} instanceStr  The new value for the jsinstance attribute
+ */
+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);
+}
+
+
+/**
+ * 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 {Element} template Currently processed template node.
+ *
+ * @param {String} valuesStr Value of the jsvalues attribute to be
+ * processed.
+ */
+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);
+
+    if (label.charAt(0) == '$') {
+      context.setVariable(label, value);
+
+    } else if (label.charAt(0) == '.') {
+      var nameSpaceLabel = label.substr(1).split('.');
+      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 (value) {
+          domSetAttribute(template, label, label);
+        } else {
+          domRemoveAttribute(template, label);
+        }
+      } else {
+        domSetAttribute(template, label, '' + 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 {Element} template Currently processed template node.
+ *
+ * @param {String} content Value of the jscontent attribute to be
+ * processed.
+ */
+JstProcessor.prototype.jstContent_ = function(context, template, content) {
+  var value = '' + context.jseval(content, template);
+  if (template.innerHTML == value) {
+    return;
+  }
+  while (template.firstChild) {
+    domRemoveNode(template.firstChild);
+  }
+  var t = domCreateTextNode(ownerDocument(template), value);
+  domAppendChild(template, t);
+}
+
+
+/**
+ * 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 (section) {
+    var ret = domCloneNode(section);
+    domRemoveAttribute(ret, 'id');
+    return ret;
+  } else {
+    return null;
+  }
+}
+
+window['jstGetTemplate'] = jstGetTemplate;
+window['jstProcess'] = jstProcess;
+window['JsExprContext'] = JsExprContext;