Index: chrome/third_party/jstemplate/jstemplate.js |
=================================================================== |
--- chrome/third_party/jstemplate/jstemplate.js (revision 177458) |
+++ chrome/third_party/jstemplate/jstemplate.js (working copy) |
@@ -1,967 +0,0 @@ |
-// 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; |
- 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. This is |
- * necessary to process deep templates in Safari which has a |
- * relatively shallow maximum recursion depth of 100. |
- * @class |
- * @constructor |
- */ |
-function JstProcessor() { |
-} |
- |
- |
-/** |
- * 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); |
- } |
- } |
- |
- 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) { |
-}; |
- |
- |
-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); |
- |
- 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); |
- |
- // 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 (!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 (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) { |
-}; |
- |
- |
-/** |
- * Retrieve the processing logs. |
- * @return {Array.<string>} The processing logs. |
- */ |
-JstProcessor.prototype.getLogs = function() { |
- return this.logs_; |
-}; |