Index: chrome/test/data/extensions/samples/benchmark/jst/jstemplate.js |
=================================================================== |
--- chrome/test/data/extensions/samples/benchmark/jst/jstemplate.js (revision 0) |
+++ chrome/test/data/extensions/samples/benchmark/jst/jstemplate.js (revision 0) |
@@ -0,0 +1,1018 @@ |
+// Copyright 2006 Google Inc. |
+// |
+// Licensed under the Apache License, Version 2.0 (the "License"); |
+// you may not use this file except in compliance with the License. |
+// You may obtain a copy of the License at |
+// |
+// http://www.apache.org/licenses/LICENSE-2.0 |
+// |
+// Unless required by applicable law or agreed to in writing, software |
+// distributed under the License is distributed on an "AS IS" BASIS, |
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
+// implied. See the License for the specific language governing |
+// permissions and limitations under the License. |
+/** |
+ * 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(mesch): IE DOM doesn't have importNode(). |
+ * |
+ * 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'; |
+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 {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. |
+ * |
+ * @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; |
+ if (MAPS_DEBUG && opt_debugging) { |
+ processor.setDebugging(opt_debugging); |
+ } |
+ 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)); |
+ if (MAPS_DEBUG && opt_debugging) { |
+ log('jstProcess:' + '\n' + processor.getLogs().join('\n')); |
+ } |
+} |
+ |
+ |
+/** |
+ * 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() { |
+ if (MAPS_DEBUG) { |
+ /** |
+ * An array of logging messages. These are collected during processing |
+ * and dumped to the console at the end. |
+ * @type Array.<string> |
+ */ |
+ this.logs_ = []; |
+ } |
+} |
+ |
+ |
+/** |
+ * 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 the node already has a cache property, return it. |
+ if (node[PROP_jstcache]) { |
+ return node[PROP_jstcache]; |
+ } |
+ |
+ // If it is not found, we always set the PROP_jstcache property on the node. |
+ // Accessing the property is faster than executing getAttribute(). If we |
+ // don't find the property on a node that was cloned in jstSelect_(), we |
+ // will fall back to check for the attribute and set the property |
+ // from cache. |
+ |
+ // If the node has an attribute indexing a cache object, set it as a property |
+ // and return it. |
+ 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; |
+ |
+ // Look for interesting attributes. |
+ 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 none found, mark this node to prevent further inspection, and return |
+ // an empty cache object. |
+ if (attributeList.length == 0) { |
+ domSetAttribute(node, ATT_jstcache, STRING_zero); |
+ return node[PROP_jstcache] = JstProcessor.jstcache_[0]; |
+ } |
+ |
+ // If we already have a cache object corresponding to these attributes, |
+ // annotate the node with it, and return it. |
+ var attstring = attributeList.join(CHAR_ampersand); |
+ if (jstid = JstProcessor.jstcacheattributes_[attstring]) { |
+ domSetAttribute(node, ATT_jstcache, jstid); |
+ return node[PROP_jstcache] = JstProcessor.jstcache_[jstid]; |
+ } |
+ |
+ // Otherwise, build a new cache object. |
+ 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); |
+ if (MAPS_DEBUG) { |
+ jstcache.jstAttributeValues = jstcache.jstAttributeValues || {}; |
+ jstcache.jstAttributeValues[name] = 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; |
+ |
+ /** |
+ * 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; |
+ } |
+ |
+ // Run the first function in the queue. |
+ 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) { |
+ if (MAPS_DEBUG) { |
+ this.debugging_ = 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.jstProcessOuter_ = function(context, template) { |
+ var me = this; |
+ |
+ var jstAttributes = me.jstAttributes_(template); |
+ if (MAPS_DEBUG && me.debugging_) { |
+ me.logState_('Outer', template, jstAttributes.jstAttributeValues); |
+ } |
+ |
+ var transclude = jstAttributes[ATT_transclude]; |
+ if (transclude) { |
+ var tr = jstGetTemplate(transclude); |
+ if (tr) { |
+ domReplaceChild(tr, template); |
+ var call = me.createArray_(); |
+ call.push(me.jstProcessOuter_, context, tr); |
+ me.push_(call); |
+ } else { |
+ domRemoveNode(template); |
+ } |
+ return; |
+ } |
+ |
+ var select = jstAttributes[ATT_select]; |
+ if (select) { |
+ me.jstSelect_(context, template, select); |
+ } 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); |
+ if (MAPS_DEBUG && me.debugging_) { |
+ me.logState_('Inner', template, jstAttributes.jstAttributeValues); |
+ } |
+ |
+ // NOTE(mesch): See NOTE on ATT_content why this is a separate |
+ // attribute, and not a special value in ATT_values. |
+ var display = jstAttributes[ATT_display]; |
+ if (display) { |
+ var shouldDisplay = context.jsexec(display, template); |
+ if (MAPS_DEBUG && me.debugging_) { |
+ me.logs_.push(ATT_display + ': ' + shouldDisplay + '<br/>'); |
+ } |
+ if (!shouldDisplay) { |
+ displayNone(template); |
+ return; |
+ } |
+ displayDefault(template); |
+ } |
+ |
+ // NOTE(mesch): jsvars is evaluated before jsvalues, because it's |
+ // more useful to be able to use var values in attribute value |
+ // expressions than vice versa. |
+ var values = jstAttributes[ATT_vars]; |
+ if (values) { |
+ me.jstVars_(context, template, values); |
+ } |
+ |
+ values = jstAttributes[ATT_values]; |
+ if (values) { |
+ me.jstValues_(context, template, values); |
+ } |
+ |
+ // Evaluate expressions immediately. Useful for hooking callbacks |
+ // into jstemplates. |
+ // |
+ // NOTE(mesch): Evaluation order is sometimes significant, e.g. when |
+ // the expression evaluated in jseval relies on the values set in |
+ // jsvalues, so it needs to be evaluated *after* |
+ // jsvalues. TODO(mesch): This is quite arbitrary, it would be |
+ // better if this would have more necessity to it. |
+ var expressions = jstAttributes[ATT_eval]; |
+ if (expressions) { |
+ 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 (MAPS_DEBUG && me.debugging_) { |
+ me.logs_.push(ATT_skip + ': ' + shouldSkip + '<br/>'); |
+ } |
+ if (shouldSkip) return; |
+ } |
+ |
+ // NOTE(mesch): content is a separate attribute, instead of just a |
+ // special value mentioned in values, for two reasons: (1) it is |
+ // fairly common to have only mapped content, and writing |
+ // content="expr" is shorter than writing values="content:expr", and |
+ // (2) the presence of content actually terminates traversal, and we |
+ // need to check for that. Display is a separate attribute for a |
+ // reason similar to the second, in that its presence *may* |
+ // terminate traversal. |
+ var content = jstAttributes[ATT_content]; |
+ if (content) { |
+ me.jstContent_(context, template, content); |
+ |
+ } else { |
+ // Newly generated children should be ignored, so we explicitly |
+ // store the children to be processed. |
+ 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 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 {JsEvalContext} context The current evaluation context. |
+ * |
+ * @param {Element} template The currently processed node of the template. |
+ * |
+ * @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.jsexec(select, template); |
+ |
+ // Enable reprocessing: if this template is reprocessed, then only |
+ // fill the section instance here. Otherwise do the cardinal |
+ // processing of a new template. |
+ var instance = domGetAttribute(template, ATT_instance); |
+ |
+ var instanceLast = false; |
+ if (instance) { |
+ if (instance.charAt(0) == CHAR_asterisk) { |
+ instance = parseInt10(instance.substr(1)); |
+ instanceLast = true; |
+ } else { |
+ instance = parseInt10(/** @type string */(instance)); |
+ } |
+ } |
+ |
+ // The expression value instanceof Array is occasionally false for |
+ // arrays, seen in Firefox. Thus we recognize an array as an object |
+ // which is not null that has a length property. Notice that this |
+ // also matches input data with a length property, so this property |
+ // name should be avoided in input data. |
+ var multiple = isArray(value); |
+ var count = multiple ? jsLength(value) : 1; |
+ var multipleEmpty = (multiple && count == 0); |
+ |
+ if (multiple) { |
+ if (multipleEmpty) { |
+ // For an empty array, keep the first template instance and mark |
+ // it last. Remove all other template instances. |
+ if (!instance) { |
+ domSetAttribute(template, ATT_instance, STRING_asteriskzero); |
+ displayNone(template); |
+ } else { |
+ domRemoveNode(template); |
+ } |
+ |
+ } else { |
+ displayDefault(template); |
+ // For a non empty array, create as many template instances as |
+ // are needed. If the template is first processed, as many |
+ // template instances are needed as there are values in the |
+ // array. If the template is reprocessed, new template instances |
+ // are only needed if there are more array values than template |
+ // instances. Those additional instances are created by |
+ // replicating the last template instance. |
+ // |
+ // When the template is first processed, there is no jsinstance |
+ // attribute. This is indicated by instance === null, except in |
+ // opera it is instance === "". Notice also that the === is |
+ // essential, because 0 == "", presumably via type coercion to |
+ // boolean. |
+ if (instance === null || instance === STRING_empty || |
+ (instanceLast && instance < count - 1)) { |
+ // A queue of calls to push. |
+ 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); |
+ 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); |
+ |
+ } |
+ // Push the originally present template instance last to keep |
+ // the order aligned with the DOM order, because the newly |
+ // created template instances are inserted *before* the |
+ // original instance. |
+ 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]; |
+ |
+ 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) { |
+ displayNone(template); |
+ } else { |
+ 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); |
+ } |
+ } |
+}; |
+ |
+ |
+/** |
+ * 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 {JsEvalContext} context Current evaluation context. |
+ * |
+ * @param {Element} template Currently processed template node. |
+ * |
+ * @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. |
+ */ |
+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 {JsEvalContext} context Current evaluation context. |
+ * |
+ * @param {Element} template Currently processed template node. |
+ * |
+ * @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, 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) == CHAR_dollar) { |
+ // A jsvalues entry whose name starts with $ sets a local |
+ // variable. |
+ context.setVariable(label, value); |
+ |
+ } else if (label.charAt(0) == CHAR_period) { |
+ // A jsvalues entry whose name starts with . sets a property of |
+ // the current template node. The name may have further dot |
+ // separated components, which are translated into namespace |
+ // objects. This specifically allows to set properties on .style |
+ // using jsvalues. NOTE(mesch): Setting the style attribute has |
+ // no effect in IE and hence should not be done anyway. |
+ 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) { |
+ // Any other jsvalues entry sets an attribute of the current |
+ // template node. |
+ if (typeof value == TYPE_boolean) { |
+ // Handle boolean values that are set as attributes specially, |
+ // according to the XML/HTML convention. |
+ if (value) { |
+ domSetAttribute(template, label, label); |
+ } else { |
+ domRemoveAttribute(template, label); |
+ } |
+ } else { |
+ 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 {JsEvalContext} context Current evaluation context. |
+ * |
+ * @param {Element} template Currently processed template node. |
+ * |
+ * @param {Function} content Processed value of the jscontent |
+ * attribute. |
+ */ |
+JstProcessor.prototype.jstContent_ = function(context, template, content) { |
+ // NOTE(mesch): Profiling shows that this method costs significant |
+ // time. In jstemplate_perf.html, it's about 50%. I tried to replace |
+ // by HTML escaping and assignment to innerHTML, but that was even |
+ // slower. |
+ var value = STRING_empty + context.jsexec(content, template); |
+ // Prevent flicker when refreshing a template and the value doesn't |
+ // change. |
+ if (template.innerHTML == value) { |
+ return; |
+ } |
+ while (template.firstChild) { |
+ domRemoveNode(template.firstChild); |
+ } |
+ 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. |
+ * |
+ * 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) { |
+ 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; |
+ } |
+ // Load any necessary HTML and try again. |
+ 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) { |
+ if (MAPS_DEBUG) { |
+ var msg = '<table>'; |
+ msg += '<caption>' + caller + '</caption>'; |
+ msg += '<tbody>'; |
+ if (template.id) { |
+ msg += '<tr><td>' + 'id:' + '</td><td>' + template.id + '</td></tr>'; |
+ } |
+ if (template.name) { |
+ msg += '<tr><td>' + 'name:' + '</td><td>' + template.name + '</td></tr>'; |
+ } |
+ if (jstAttributeValues) { |
+ msg += '<tr><td>' + 'attr:' + |
+ '</td><td>' + jsToSource(jstAttributeValues) + '</td></tr>'; |
+ } |
+ msg += '</tbody></table><br/>'; |
+ this.logs_.push(msg); |
+ } |
+}; |
+ |
+ |
+/** |
+ * Retrieve the processing logs. |
+ * @return {Array.<string>} The processing logs. |
+ */ |
+JstProcessor.prototype.getLogs = function() { |
+ return this.logs_; |
+}; |
+ |