From 9d822d41d86ee7f9f9c1dbaf6621acf825e7e257 Mon Sep 17 00:00:00 2001
From: Meirza <meirza.arson@moodle.com>
Date: Tue, 6 Dec 2022 15:28:24 +0700
Subject: [PATCH] MDL-76508 templates: Handling non-JSON string

When the param string contains a left curly bracket as the first character,
the system will assume the string is a JSON string and will be parsed and returned as an object.
But in some cases, the string is not JSON and will return an error if the system parses it.
For example, a user might have used the course name with a left curly bracket as the first character.
Adding a double quote after the left curly bracket to differentiate between string and JSON string,
so it can be safe to parse the string.
---
 lib/amd/build/templates.min.js     |  2 +-
 lib/amd/build/templates.min.js.map |  2 +-
 lib/amd/src/templates.js           | 17 +++++++++++++++--
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/lib/amd/build/templates.min.js b/lib/amd/build/templates.min.js
index 00c75c4c506..33748237397 100644
--- a/lib/amd/build/templates.min.js
+++ b/lib/amd/build/templates.min.js
@@ -6,6 +6,6 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  * @since      2.9
  */
-define("core/templates",["core/mustache","jquery","core/ajax","core/str","core/notification","core/url","core/config","core/localstorage","core/icon_system","core_filters/events","core/yui","core/log","core/truncate","core/user_date","core/pending"],(function(mustache,$,ajax,str,notification,coreurl,config,storage,IconSystem,filterEvents,Y,Log,Truncate,UserDate,Pending){var uniqInstances=0,templateCache={},templatePromises={},cachePartialPromises={},iconSystem={},loadTemplateBuffer=[],isLoadingTemplates=!1,disallowedNestedHelpers=["js"],getNormalisedComponent=function(component){return component&&"moodle"!==component&&"core"!==component?component:"core"},getTemplatePromiseFromCache=function(searchKey){if(searchKey in templatePromises)return templatePromises[searchKey];if(searchKey in templateCache)return templatePromises[searchKey]=$.Deferred().resolve(templateCache[searchKey]).promise(),templatePromises[searchKey];if(M.cfg.templaterev<=0)return null;var cached=storage.get("core_template/"+M.cfg.templaterev+":"+searchKey);return cached?(templateCache[searchKey]=cached,templatePromises[searchKey]=$.Deferred().resolve(cached).promise(),templatePromises[searchKey]):null},processLoadTemplateBuffer=function(){if(loadTemplateBuffer.length&&!isLoadingTemplates){isLoadingTemplates=!0;var templatesToLoad=loadTemplateBuffer.slice(),serverRequestsDeferred=$.Deferred(),requests=[],templatePromises=templatesToLoad.map((function(templateData){var component=getNormalisedComponent(templateData.component),name=templateData.name,searchKey=templateData.searchKey,theme=templateData.theme,templateDeferred=templateData.deferred,promise=null,cachedPromise=getTemplatePromiseFromCache(searchKey);if(cachedPromise)promise=cachedPromise;else{requests.push({methodname:"core_output_load_template_with_dependencies",args:{component:component,template:name,themename:theme,lang:$("html").attr("lang").replace(/-/g,"_")}});var index=requests.length-1;promise=serverRequestsDeferred.promise().then((function(promises){return templatePromises[searchKey]=promises[index].then((function(response){var templateSource=null;return response.templates.forEach((function(data){data.component=getNormalisedComponent(data.component);var tempSearchKey=[theme,data.component,data.name].join("/");templateCache[tempSearchKey]=data.value,M.cfg.templaterev>0&&storage.set("core_template/"+M.cfg.templaterev+":"+tempSearchKey,data.value),data.component==component&&data.name==name&&(templateSource=data.value)})),response.strings.length&&str.cache_strings(response.strings.map((function(data){return{component:getNormalisedComponent(data.component),key:data.name,value:data.value}}))),templateSource})),templatePromises[searchKey]}))}return promise.then((function(source){return templateDeferred.resolve(source)})).catch((function(error){throw templateDeferred.reject(error),error}))}));requests.length?serverRequestsDeferred.resolve(ajax.call(requests,!0,!1,!1,0,M.cfg.templaterev)):serverRequestsDeferred.resolve(),$.when.apply(null,templatePromises).then((function(){loadTemplateBuffer.splice(0,templatesToLoad.length),isLoadingTemplates=!1,processLoadTemplateBuffer()})).catch((function(){loadTemplateBuffer.splice(0,templatesToLoad.length),isLoadingTemplates=!1,processLoadTemplateBuffer()}))}},Renderer=function(){this.requiredStrings=[],this.requiredJS=[],this.requiredDates=[],this.currentThemeName=""};Renderer.prototype.requiredStrings=null,Renderer.prototype.requiredDates=[],Renderer.prototype.requiredJS=null,Renderer.prototype.currentThemeName="",Renderer.prototype.getTemplate=function(templateName){var currentTheme=this.currentThemeName,searchKey=currentTheme+"/"+templateName,cachedPromise=getTemplatePromiseFromCache(searchKey);if(cachedPromise)return cachedPromise;var existingBufferRecords=loadTemplateBuffer.filter((function(record){return record.searchKey==searchKey}));if(existingBufferRecords.length)return existingBufferRecords[0].deferred.promise();var parts=templateName.split("/"),component=getNormalisedComponent(parts.shift()),name=parts.join("/"),deferred=$.Deferred();return loadTemplateBuffer.push({component:component,name:name,theme:currentTheme,searchKey:searchKey,deferred:deferred}),processLoadTemplateBuffer(),deferred.promise()},Renderer.prototype.prefetchTemplates=function(templateNames,currentTheme){templateNames.forEach((function(templateName){var searchKey=currentTheme+"/"+templateName;if(!getTemplatePromiseFromCache(searchKey)&&!loadTemplateBuffer.filter((function(record){return record.searchKey==searchKey})).length){var parts=templateName.split("/"),component=getNormalisedComponent(parts.shift()),name=parts.join("/");loadTemplateBuffer.push({component:component,name:name,theme:currentTheme,searchKey:searchKey,deferred:$.Deferred()})}})),processLoadTemplateBuffer()},Renderer.prototype.partialHelper=function(name){var searchKey=this.currentThemeName+"/"+name;return searchKey in templateCache||notification.exception(new Error("Failed to pre-fetch the template: "+name)),templateCache[searchKey]},Renderer.prototype.renderIcon=function(key,component,title){var modulename=config.iconsystemmodule;component=getNormalisedComponent(component);var ready=$.Deferred();return require([modulename],(function(System){var system=new System;system instanceof IconSystem?(iconSystem=system,system.init().then(ready.resolve).catch(notification.exception)):ready.reject("Invalid icon system specified"+config.iconsystemmodule)})),ready.then(function(iconSystem){return this.getTemplate(iconSystem.getTemplateName())}.bind(this)).then((function(template){return iconSystem.renderIcon(key,component,title,template)}))},Renderer.prototype.pixHelper=function(context,sectionText,helper){var parts=sectionText.split(","),key="",component="",text="";parts.length>0&&(key=helper(parts.shift().trim(),context)),parts.length>0&&(component=helper(parts.shift().trim(),context)),parts.length>0&&(text=helper(parts.join(",").trim(),context));var templateName=iconSystem.getTemplateName(),searchKey=this.currentThemeName+"/"+templateName,template=templateCache[searchKey];return component=getNormalisedComponent(component),key=key.replace(/&#x2F;/gi,"/"),iconSystem.renderIcon(key,component,text,template)},Renderer.prototype.jsHelper=function(context,sectionText,helper){return this.requiredJS.push(helper(sectionText,context)),""},Renderer.prototype.stringHelper=function(context,sectionText,helper){var parts=sectionText.split(","),key="",component="",param="";parts.length>0&&(key=parts.shift().trim()),parts.length>0&&(component=parts.shift().trim()),parts.length>0&&(param=parts.join(",").trim()),component=getNormalisedComponent(component),""!==param&&(param=helper(param,context)),0===param.indexOf("{")&&0!==param.indexOf("{{")&&(param=JSON.parse(param));var index=this.requiredStrings.length;return this.requiredStrings.push({key:key,component:component,param:param}),"[[_s"+index+"]]"},Renderer.prototype.cleanStringHelper=function(context,sectionText,helper){return this.stringHelper(context,sectionText,helper).replace("s","c")},Renderer.prototype.quoteHelper=function(context,sectionText,helper){var content=helper(sectionText.trim(),context);return content=(content=JSON.stringify(content)).replace(/([{}]{2,3})/g,"{{=<% %>=}}$1<%={{ }}=%>")},Renderer.prototype.shortenTextHelper=function(context,sectionText,helper){var parts=sectionText.match(/(.*?),(.*)/),length=parts[1].trim(),content=helper(parts[2].trim(),context);return Truncate.truncate(content,{length:length,words:!0,ellipsis:"..."})},Renderer.prototype.userDateHelper=function(context,sectionText,helper){var parts=sectionText.match(/(.*?),(.*)/),timestamp=helper(parts[1].trim(),context),format=helper(parts[2].trim(),context),index=this.requiredDates.length;return this.requiredDates.push({timestamp:timestamp,format:format}),"[[_t_"+index+"]]"},Renderer.prototype.addHelperFunction=function(helperFunction,context){return function(){return function(sectionText,helper){var originalHelpers=disallowedNestedHelpers.reduce((function(carry,name){return context.hasOwnProperty(name)&&(carry[name]=context[name]),carry}),{});disallowedNestedHelpers.forEach((function(helperName){context[helperName]=function(){return""}}));var result=helperFunction.apply(this,[context,sectionText,helper]);for(var name in originalHelpers)context[name]=originalHelpers[name];return result}.bind(this)}.bind(this)},Renderer.prototype.addHelpers=function(context,themeName){this.currentThemeName=themeName,this.requiredStrings=[],this.requiredJS=[],context.uniqid=uniqInstances++,context.str=this.addHelperFunction(this.stringHelper,context),context.cleanstr=this.addHelperFunction(this.cleanStringHelper,context),context.pix=this.addHelperFunction(this.pixHelper,context),context.js=this.addHelperFunction(this.jsHelper,context),context.quote=this.addHelperFunction(this.quoteHelper,context),context.shortentext=this.addHelperFunction(this.shortenTextHelper,context),context.userdate=this.addHelperFunction(this.userDateHelper,context),context.globals={config:config},context.currentTheme=themeName},Renderer.prototype.getJS=function(){var js="";return this.requiredJS.length>0&&(js=this.requiredJS.join(";\n")),js},Renderer.prototype.treatStringsInContent=function(content,strings){var treated,index,strIndex,walker,char,strFinal,isClean,pattern=/\[\[_(s|c)\d+\]\]/;do{for(treated="",index=content.search(pattern);index>-1;){treated+=content.substring(0,index),isClean="c"==(content=content.substr(index))[3],strIndex="",walker=4,char=content.substr(walker,1);do{strIndex+=char,walker++,char=content.substr(walker,1)}while("]"!=char);void 0===(strFinal=strings[parseInt(strIndex,10)])&&(Log.debug("Could not find string for pattern [[_"+(isClean?"c":"s")+strIndex+"]]."),strFinal=""),isClean&&(strFinal=mustache.escape(strFinal)),treated+=strFinal,index=(content=content.substr(6+strIndex.length)).search(pattern)}index=(content=treated+content).search(pattern)}while(index>-1);return content},Renderer.prototype.treatDatesInContent=function(content,dates){return dates.forEach((function(date,index){var re=new RegExp("\\[\\[_t_"+index+"\\]\\]","g");content=content.replace(re,date)})),content},Renderer.prototype.doRender=function(templateSource,context,themeName){this.currentThemeName=themeName;var iconTemplate=iconSystem.getTemplateName(),pendingPromise=new Pending("core/templates:doRender");return this.getTemplate(iconTemplate).then(function(){this.addHelpers(context,themeName);var result=mustache.render(templateSource,context,this.partialHelper.bind(this));return $.Deferred().resolve(result.trim(),this.getJS()).promise()}.bind(this)).then(function(html,js){return this.requiredStrings.length>0?str.get_strings(this.requiredStrings).then(function(strings){return this.requiredDates=this.requiredDates.map(function(date){return{timestamp:this.treatStringsInContent(date.timestamp,strings),format:this.treatStringsInContent(date.format,strings)}}.bind(this)),html=this.treatStringsInContent(html,strings),js=this.treatStringsInContent(js,strings),$.Deferred().resolve(html,js).promise()}.bind(this)):$.Deferred().resolve(html,js).promise()}.bind(this)).then(function(html,js){return this.requiredDates.length>0?UserDate.get(this.requiredDates).then(function(dates){return html=this.treatDatesInContent(html,dates),js=this.treatDatesInContent(js,dates),$.Deferred().resolve(html,js).promise()}.bind(this)):$.Deferred().resolve(html,js).promise()}.bind(this)).then((function(html,js){return pendingPromise.resolve(),$.Deferred().resolve(html,js).promise()}))};var runTemplateJS=function(source){if(""!==source.trim()){var newscript=$("<script>").attr("type","text/javascript").html(source);$("head").append(newscript)}},domReplace=function(element,newHTML,newJS,replaceChildNodes){var replaceNode=$(element);if(replaceNode.length){var newNodes=$(newHTML);return replaceChildNodes?(new Y.NodeList(replaceNode.children().get()).destroy(!0),replaceNode.empty(),replaceNode.append(newNodes)):(new Y.NodeList(replaceNode.get()).destroy(!0),replaceNode.replaceWith(newNodes)),runTemplateJS(newJS),filterEvents.notifyFilterContentUpdated(newNodes),newNodes.get()}return[]};Renderer.prototype.scanForPartials=function(templateSource){var tokens=mustache.parse(templateSource),partials=[],findPartial=function(tokens,partials){var i,token;for(i=0;i<tokens.length;i++)">"!=(token=tokens[i])[0]&&"<"!=token[0]||partials.push(token[1]),token.length>4&&findPartial(token[4],partials)};return findPartial(tokens,partials),partials},Renderer.prototype.cachePartials=function(templateName,parentage){var searchKey=this.currentThemeName+"/"+templateName;return searchKey in cachePartialPromises||(parentage=parentage||[searchKey],cachePartialPromises[searchKey]=$.Deferred(),this.getTemplate(templateName).then(function(templateSource){var fetchThemAll=this.scanForPartials(templateSource).filter(function(partialName){return!(parentage.indexOf(this.currentThemeName+"/"+partialName)>=0)&&partialName!=templateName}.bind(this)).map(function(partialName){return parentage.push(this.currentThemeName+"/"+partialName),this.cachePartials(partialName,parentage)}.bind(this));return $.when.apply($,fetchThemAll).then((function(){return cachePartialPromises[searchKey].resolve(templateSource)}))}.bind(this)).catch(cachePartialPromises[searchKey].reject)),cachePartialPromises[searchKey]},Renderer.prototype.render=function(templateName,context,themeName){void 0===themeName&&(themeName=config.theme),this.currentThemeName=themeName;var modulename=config.iconsystemmodule,ready=$.Deferred();return require([modulename],(function(System){var system=new System;system instanceof IconSystem?(iconSystem=system,system.init().then(ready.resolve).catch(notification.exception)):ready.reject("Invalid icon system specified"+config.iconsystem)})),ready.then(function(){return this.cachePartials(templateName)}.bind(this)).then(function(templateSource){return this.doRender(templateSource,context,themeName)}.bind(this))};return{render:function(templateName,context,themeName){return(new Renderer).render(templateName,context,themeName)},prefetchTemplates:function(templateNames,themeName){var renderer=new Renderer;return void 0===themeName&&(themeName=config.theme),renderer.prefetchTemplates(templateNames,themeName)},renderForPromise:function(templateName,context,themeName){return(new Renderer).render(templateName,context,themeName).then((function(html,js){return{html:html,js:js}}))},renderPix:function(key,component,title){return(new Renderer).renderIcon(key,getNormalisedComponent(component),title)},runTemplateJS:runTemplateJS,replaceNodeContents:function(element,newHTML,newJS){return domReplace(element,newHTML,newJS,!0)},replaceNode:function(element,newHTML,newJS){return domReplace(element,newHTML,newJS,!1)},prependNodeContents:function(element,html,js){return function(element,html,js){var node=$(element);if(node.length){var newContent=$(html);return node.prepend(newContent),runTemplateJS(js),filterEvents.notifyFilterContentUpdated(node),newContent.get()}return[]}(element,html,js)},appendNodeContents:function(element,html,js){return function(element,html,js){var node=$(element);if(node.length){var newContent=$(html);return node.append(newContent),runTemplateJS(js),filterEvents.notifyFilterContentUpdated(node),newContent.get()}return[]}(element,html,js)}}}));
+define("core/templates",["core/mustache","jquery","core/ajax","core/str","core/notification","core/url","core/config","core/localstorage","core/icon_system","core_filters/events","core/yui","core/log","core/truncate","core/user_date","core/pending"],(function(mustache,$,ajax,str,notification,coreurl,config,storage,IconSystem,filterEvents,Y,Log,Truncate,UserDate,Pending){var uniqInstances=0,templateCache={},templatePromises={},cachePartialPromises={},iconSystem={},loadTemplateBuffer=[],isLoadingTemplates=!1,disallowedNestedHelpers=["js"],getNormalisedComponent=function(component){return component&&"moodle"!==component&&"core"!==component?component:"core"},getTemplatePromiseFromCache=function(searchKey){if(searchKey in templatePromises)return templatePromises[searchKey];if(searchKey in templateCache)return templatePromises[searchKey]=$.Deferred().resolve(templateCache[searchKey]).promise(),templatePromises[searchKey];if(M.cfg.templaterev<=0)return null;var cached=storage.get("core_template/"+M.cfg.templaterev+":"+searchKey);return cached?(templateCache[searchKey]=cached,templatePromises[searchKey]=$.Deferred().resolve(cached).promise(),templatePromises[searchKey]):null},processLoadTemplateBuffer=function(){if(loadTemplateBuffer.length&&!isLoadingTemplates){isLoadingTemplates=!0;var templatesToLoad=loadTemplateBuffer.slice(),serverRequestsDeferred=$.Deferred(),requests=[],templatePromises=templatesToLoad.map((function(templateData){var component=getNormalisedComponent(templateData.component),name=templateData.name,searchKey=templateData.searchKey,theme=templateData.theme,templateDeferred=templateData.deferred,promise=null,cachedPromise=getTemplatePromiseFromCache(searchKey);if(cachedPromise)promise=cachedPromise;else{requests.push({methodname:"core_output_load_template_with_dependencies",args:{component:component,template:name,themename:theme,lang:$("html").attr("lang").replace(/-/g,"_")}});var index=requests.length-1;promise=serverRequestsDeferred.promise().then((function(promises){return templatePromises[searchKey]=promises[index].then((function(response){var templateSource=null;return response.templates.forEach((function(data){data.component=getNormalisedComponent(data.component);var tempSearchKey=[theme,data.component,data.name].join("/");templateCache[tempSearchKey]=data.value,M.cfg.templaterev>0&&storage.set("core_template/"+M.cfg.templaterev+":"+tempSearchKey,data.value),data.component==component&&data.name==name&&(templateSource=data.value)})),response.strings.length&&str.cache_strings(response.strings.map((function(data){return{component:getNormalisedComponent(data.component),key:data.name,value:data.value}}))),templateSource})),templatePromises[searchKey]}))}return promise.then((function(source){return templateDeferred.resolve(source)})).catch((function(error){throw templateDeferred.reject(error),error}))}));requests.length?serverRequestsDeferred.resolve(ajax.call(requests,!0,!1,!1,0,M.cfg.templaterev)):serverRequestsDeferred.resolve(),$.when.apply(null,templatePromises).then((function(){loadTemplateBuffer.splice(0,templatesToLoad.length),isLoadingTemplates=!1,processLoadTemplateBuffer()})).catch((function(){loadTemplateBuffer.splice(0,templatesToLoad.length),isLoadingTemplates=!1,processLoadTemplateBuffer()}))}},Renderer=function(){this.requiredStrings=[],this.requiredJS=[],this.requiredDates=[],this.currentThemeName=""};Renderer.prototype.requiredStrings=null,Renderer.prototype.requiredDates=[],Renderer.prototype.requiredJS=null,Renderer.prototype.currentThemeName="",Renderer.prototype.getTemplate=function(templateName){var currentTheme=this.currentThemeName,searchKey=currentTheme+"/"+templateName,cachedPromise=getTemplatePromiseFromCache(searchKey);if(cachedPromise)return cachedPromise;var existingBufferRecords=loadTemplateBuffer.filter((function(record){return record.searchKey==searchKey}));if(existingBufferRecords.length)return existingBufferRecords[0].deferred.promise();var parts=templateName.split("/"),component=getNormalisedComponent(parts.shift()),name=parts.join("/"),deferred=$.Deferred();return loadTemplateBuffer.push({component:component,name:name,theme:currentTheme,searchKey:searchKey,deferred:deferred}),processLoadTemplateBuffer(),deferred.promise()},Renderer.prototype.prefetchTemplates=function(templateNames,currentTheme){templateNames.forEach((function(templateName){var searchKey=currentTheme+"/"+templateName;if(!getTemplatePromiseFromCache(searchKey)&&!loadTemplateBuffer.filter((function(record){return record.searchKey==searchKey})).length){var parts=templateName.split("/"),component=getNormalisedComponent(parts.shift()),name=parts.join("/");loadTemplateBuffer.push({component:component,name:name,theme:currentTheme,searchKey:searchKey,deferred:$.Deferred()})}})),processLoadTemplateBuffer()},Renderer.prototype.partialHelper=function(name){var searchKey=this.currentThemeName+"/"+name;return searchKey in templateCache||notification.exception(new Error("Failed to pre-fetch the template: "+name)),templateCache[searchKey]},Renderer.prototype.renderIcon=function(key,component,title){var modulename=config.iconsystemmodule;component=getNormalisedComponent(component);var ready=$.Deferred();return require([modulename],(function(System){var system=new System;system instanceof IconSystem?(iconSystem=system,system.init().then(ready.resolve).catch(notification.exception)):ready.reject("Invalid icon system specified"+config.iconsystemmodule)})),ready.then(function(iconSystem){return this.getTemplate(iconSystem.getTemplateName())}.bind(this)).then((function(template){return iconSystem.renderIcon(key,component,title,template)}))},Renderer.prototype.pixHelper=function(context,sectionText,helper){var parts=sectionText.split(","),key="",component="",text="";parts.length>0&&(key=helper(parts.shift().trim(),context)),parts.length>0&&(component=helper(parts.shift().trim(),context)),parts.length>0&&(text=helper(parts.join(",").trim(),context));var templateName=iconSystem.getTemplateName(),searchKey=this.currentThemeName+"/"+templateName,template=templateCache[searchKey];return component=getNormalisedComponent(component),key=key.replace(/&#x2F;/gi,"/"),iconSystem.renderIcon(key,component,text,template)},Renderer.prototype.jsHelper=function(context,sectionText,helper){return this.requiredJS.push(helper(sectionText,context)),""},Renderer.prototype.stringHelper=function(context,sectionText,helper){var parts=sectionText.split(","),key="",component="",param="";if(parts.length>0&&(key=parts.shift().trim()),parts.length>0&&(component=parts.shift().trim()),parts.length>0&&(param=parts.join(",").trim()),component=getNormalisedComponent(component),""!==param&&(param=helper(param,context)),0===param.indexOf('{"'))try{const parsedParam=JSON.parse(param);parsedParam&&"object"==typeof parsedParam&&(param=parsedParam)}catch(err){window.console.warn(err.message)}var index=this.requiredStrings.length;return this.requiredStrings.push({key:key,component:component,param:param}),"[[_s"+index+"]]"},Renderer.prototype.cleanStringHelper=function(context,sectionText,helper){return this.stringHelper(context,sectionText,helper).replace("s","c")},Renderer.prototype.quoteHelper=function(context,sectionText,helper){var content=helper(sectionText.trim(),context);return content=(content=JSON.stringify(content)).replace(/([{}]{2,3})/g,"{{=<% %>=}}$1<%={{ }}=%>")},Renderer.prototype.shortenTextHelper=function(context,sectionText,helper){var parts=sectionText.match(/(.*?),(.*)/),length=parts[1].trim(),content=helper(parts[2].trim(),context);return Truncate.truncate(content,{length:length,words:!0,ellipsis:"..."})},Renderer.prototype.userDateHelper=function(context,sectionText,helper){var parts=sectionText.match(/(.*?),(.*)/),timestamp=helper(parts[1].trim(),context),format=helper(parts[2].trim(),context),index=this.requiredDates.length;return this.requiredDates.push({timestamp:timestamp,format:format}),"[[_t_"+index+"]]"},Renderer.prototype.addHelperFunction=function(helperFunction,context){return function(){return function(sectionText,helper){var originalHelpers=disallowedNestedHelpers.reduce((function(carry,name){return context.hasOwnProperty(name)&&(carry[name]=context[name]),carry}),{});disallowedNestedHelpers.forEach((function(helperName){context[helperName]=function(){return""}}));var result=helperFunction.apply(this,[context,sectionText,helper]);for(var name in originalHelpers)context[name]=originalHelpers[name];return result}.bind(this)}.bind(this)},Renderer.prototype.addHelpers=function(context,themeName){this.currentThemeName=themeName,this.requiredStrings=[],this.requiredJS=[],context.uniqid=uniqInstances++,context.str=this.addHelperFunction(this.stringHelper,context),context.cleanstr=this.addHelperFunction(this.cleanStringHelper,context),context.pix=this.addHelperFunction(this.pixHelper,context),context.js=this.addHelperFunction(this.jsHelper,context),context.quote=this.addHelperFunction(this.quoteHelper,context),context.shortentext=this.addHelperFunction(this.shortenTextHelper,context),context.userdate=this.addHelperFunction(this.userDateHelper,context),context.globals={config:config},context.currentTheme=themeName},Renderer.prototype.getJS=function(){var js="";return this.requiredJS.length>0&&(js=this.requiredJS.join(";\n")),js},Renderer.prototype.treatStringsInContent=function(content,strings){var treated,index,strIndex,walker,char,strFinal,isClean,pattern=/\[\[_(s|c)\d+\]\]/;do{for(treated="",index=content.search(pattern);index>-1;){treated+=content.substring(0,index),isClean="c"==(content=content.substr(index))[3],strIndex="",walker=4,char=content.substr(walker,1);do{strIndex+=char,walker++,char=content.substr(walker,1)}while("]"!=char);void 0===(strFinal=strings[parseInt(strIndex,10)])&&(Log.debug("Could not find string for pattern [[_"+(isClean?"c":"s")+strIndex+"]]."),strFinal=""),isClean&&(strFinal=mustache.escape(strFinal)),treated+=strFinal,index=(content=content.substr(6+strIndex.length)).search(pattern)}index=(content=treated+content).search(pattern)}while(index>-1);return content},Renderer.prototype.treatDatesInContent=function(content,dates){return dates.forEach((function(date,index){var re=new RegExp("\\[\\[_t_"+index+"\\]\\]","g");content=content.replace(re,date)})),content},Renderer.prototype.doRender=function(templateSource,context,themeName){this.currentThemeName=themeName;var iconTemplate=iconSystem.getTemplateName(),pendingPromise=new Pending("core/templates:doRender");return this.getTemplate(iconTemplate).then(function(){this.addHelpers(context,themeName);var result=mustache.render(templateSource,context,this.partialHelper.bind(this));return $.Deferred().resolve(result.trim(),this.getJS()).promise()}.bind(this)).then(function(html,js){return this.requiredStrings.length>0?str.get_strings(this.requiredStrings).then(function(strings){return this.requiredDates=this.requiredDates.map(function(date){return{timestamp:this.treatStringsInContent(date.timestamp,strings),format:this.treatStringsInContent(date.format,strings)}}.bind(this)),html=this.treatStringsInContent(html,strings),js=this.treatStringsInContent(js,strings),$.Deferred().resolve(html,js).promise()}.bind(this)):$.Deferred().resolve(html,js).promise()}.bind(this)).then(function(html,js){return this.requiredDates.length>0?UserDate.get(this.requiredDates).then(function(dates){return html=this.treatDatesInContent(html,dates),js=this.treatDatesInContent(js,dates),$.Deferred().resolve(html,js).promise()}.bind(this)):$.Deferred().resolve(html,js).promise()}.bind(this)).then((function(html,js){return pendingPromise.resolve(),$.Deferred().resolve(html,js).promise()}))};var runTemplateJS=function(source){if(""!==source.trim()){var newscript=$("<script>").attr("type","text/javascript").html(source);$("head").append(newscript)}},domReplace=function(element,newHTML,newJS,replaceChildNodes){var replaceNode=$(element);if(replaceNode.length){var newNodes=$(newHTML);return replaceChildNodes?(new Y.NodeList(replaceNode.children().get()).destroy(!0),replaceNode.empty(),replaceNode.append(newNodes)):(new Y.NodeList(replaceNode.get()).destroy(!0),replaceNode.replaceWith(newNodes)),runTemplateJS(newJS),filterEvents.notifyFilterContentUpdated(newNodes),newNodes.get()}return[]};Renderer.prototype.scanForPartials=function(templateSource){var tokens=mustache.parse(templateSource),partials=[],findPartial=function(tokens,partials){var i,token;for(i=0;i<tokens.length;i++)">"!=(token=tokens[i])[0]&&"<"!=token[0]||partials.push(token[1]),token.length>4&&findPartial(token[4],partials)};return findPartial(tokens,partials),partials},Renderer.prototype.cachePartials=function(templateName,parentage){var searchKey=this.currentThemeName+"/"+templateName;return searchKey in cachePartialPromises||(parentage=parentage||[searchKey],cachePartialPromises[searchKey]=$.Deferred(),this.getTemplate(templateName).then(function(templateSource){var fetchThemAll=this.scanForPartials(templateSource).filter(function(partialName){return!(parentage.indexOf(this.currentThemeName+"/"+partialName)>=0)&&partialName!=templateName}.bind(this)).map(function(partialName){return parentage.push(this.currentThemeName+"/"+partialName),this.cachePartials(partialName,parentage)}.bind(this));return $.when.apply($,fetchThemAll).then((function(){return cachePartialPromises[searchKey].resolve(templateSource)}))}.bind(this)).catch(cachePartialPromises[searchKey].reject)),cachePartialPromises[searchKey]},Renderer.prototype.render=function(templateName,context,themeName){void 0===themeName&&(themeName=config.theme),this.currentThemeName=themeName;var modulename=config.iconsystemmodule,ready=$.Deferred();return require([modulename],(function(System){var system=new System;system instanceof IconSystem?(iconSystem=system,system.init().then(ready.resolve).catch(notification.exception)):ready.reject("Invalid icon system specified"+config.iconsystem)})),ready.then(function(){return this.cachePartials(templateName)}.bind(this)).then(function(templateSource){return this.doRender(templateSource,context,themeName)}.bind(this))};return{render:function(templateName,context,themeName){return(new Renderer).render(templateName,context,themeName)},prefetchTemplates:function(templateNames,themeName){var renderer=new Renderer;return void 0===themeName&&(themeName=config.theme),renderer.prefetchTemplates(templateNames,themeName)},renderForPromise:function(templateName,context,themeName){return(new Renderer).render(templateName,context,themeName).then((function(html,js){return{html:html,js:js}}))},renderPix:function(key,component,title){return(new Renderer).renderIcon(key,getNormalisedComponent(component),title)},runTemplateJS:runTemplateJS,replaceNodeContents:function(element,newHTML,newJS){return domReplace(element,newHTML,newJS,!0)},replaceNode:function(element,newHTML,newJS){return domReplace(element,newHTML,newJS,!1)},prependNodeContents:function(element,html,js){return function(element,html,js){var node=$(element);if(node.length){var newContent=$(html);return node.prepend(newContent),runTemplateJS(js),filterEvents.notifyFilterContentUpdated(node),newContent.get()}return[]}(element,html,js)},appendNodeContents:function(element,html,js){return function(element,html,js){var node=$(element);if(node.length){var newContent=$(html);return node.append(newContent),runTemplateJS(js),filterEvents.notifyFilterContentUpdated(node),newContent.get()}return[]}(element,html,js)}}}));
 
 //# sourceMappingURL=templates.min.js.map
\ No newline at end of file
diff --git a/lib/amd/build/templates.min.js.map b/lib/amd/build/templates.min.js.map
index c542ba5a67d..0cc65655988 100644
--- a/lib/amd/build/templates.min.js.map
+++ b/lib/amd/build/templates.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"templates.min.js","sources":["../src/templates.js"],"sourcesContent":["// This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Template renderer for Moodle. Load and render Moodle templates with Mustache.\n *\n * @module     core/templates\n * @copyright  2015 Damyon Wiese <damyon@moodle.com>\n * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n * @since      2.9\n */\ndefine([\n    'core/mustache',\n    'jquery',\n    'core/ajax',\n    'core/str',\n    'core/notification',\n    'core/url',\n    'core/config',\n    'core/localstorage',\n    'core/icon_system',\n    'core_filters/events',\n    'core/yui',\n    'core/log',\n    'core/truncate',\n    'core/user_date',\n    'core/pending',\n],\nfunction(\n    mustache,\n    $,\n    ajax,\n    str,\n    notification,\n    coreurl,\n    config,\n    storage,\n    IconSystem,\n    filterEvents,\n    Y,\n    Log,\n    Truncate,\n    UserDate,\n    Pending\n) {\n\n    // Module variables.\n    /** @var {Number} uniqInstances Count of times this constructor has been called. */\n    var uniqInstances = 0;\n\n    /** @var {String[]} templateCache - Cache of already loaded template strings */\n    var templateCache = {};\n\n    /** @var {Promise[]} templatePromises - Cache of already loaded template promises */\n    var templatePromises = {};\n\n    /** @var {Promise[]} cachePartialPromises - Cache of already loaded template partial promises */\n    var cachePartialPromises = {};\n\n    /** @var {Object} iconSystem - Object extending core/iconsystem */\n    var iconSystem = {};\n\n    /** @var {Object[]} loadTemplateBuffer - List of templates to be loaded */\n    var loadTemplateBuffer = [];\n\n    /** @var {Bool} isLoadingTemplates - Whether templates are currently being loaded */\n    var isLoadingTemplates = false;\n\n    /** @var {Array} disallowedNestedHelpers - List of helpers that can't be called within other helpers */\n    var disallowedNestedHelpers = ['js'];\n\n    /**\n     * Normalise the provided component such that '', 'moodle', and 'core' are treated consistently.\n     *\n     * @param   {String} component\n     * @returns {String}\n     */\n    var getNormalisedComponent = function(component) {\n        if (component) {\n            if (component !== 'moodle' && component !== 'core') {\n                return component;\n            }\n        }\n\n        return 'core';\n    };\n\n    /**\n     * Search the various caches for a template promise for the given search key.\n     * The search key should be in the format <theme>/<component>/<template> e.g. boost/core/modal.\n     *\n     * If the template is found in any of the caches it will populate the other caches with\n     * the same data as well.\n     *\n     * @param {String} searchKey The template search key in the format <theme>/<component>/<template> e.g. boost/core/modal\n     * @return {Object} jQuery promise resolved with the template source\n     */\n    var getTemplatePromiseFromCache = function(searchKey) {\n        // First try the cache of promises.\n        if (searchKey in templatePromises) {\n            return templatePromises[searchKey];\n        }\n\n        // Check the module cache.\n        if (searchKey in templateCache) {\n            // Add this to the promises cache for future.\n            templatePromises[searchKey] = $.Deferred().resolve(templateCache[searchKey]).promise();\n            return templatePromises[searchKey];\n        }\n\n        if (M.cfg.templaterev <= 0) {\n            // Template caching is disabled. Do not store in persistent storage.\n            return null;\n        }\n\n        // Now try local storage.\n        var cached = storage.get('core_template/' + M.cfg.templaterev + ':' + searchKey);\n        if (cached) {\n            // Add this to the module cache for future.\n            templateCache[searchKey] = cached;\n            // Add this to the promises cache for future.\n            templatePromises[searchKey] = $.Deferred().resolve(cached).promise();\n            return templatePromises[searchKey];\n        }\n\n        return null;\n    };\n\n    /**\n     * Take all of the templates waiting in the buffer and load them from the server\n     * or from the cache.\n     *\n     * All of the templates that need to be loaded from the server will be batched up\n     * and sent in a single network request.\n     */\n    var processLoadTemplateBuffer = function() {\n        if (!loadTemplateBuffer.length) {\n            return;\n        }\n\n        if (isLoadingTemplates) {\n            return;\n        }\n\n        isLoadingTemplates = true;\n        // Grab any templates waiting in the buffer.\n        var templatesToLoad = loadTemplateBuffer.slice();\n        // This will be resolved with the list of promises for the server request.\n        var serverRequestsDeferred = $.Deferred();\n        var requests = [];\n        // Get a list of promises for each of the templates we need to load.\n        var templatePromises = templatesToLoad.map(function(templateData) {\n            var component = getNormalisedComponent(templateData.component);\n            var name = templateData.name;\n            var searchKey = templateData.searchKey;\n            var theme = templateData.theme;\n            var templateDeferred = templateData.deferred;\n            var promise = null;\n\n            // Double check to see if this template happened to have landed in the\n            // cache as a dependency of an earlier template.\n            var cachedPromise = getTemplatePromiseFromCache(searchKey);\n            if (cachedPromise) {\n                // We've seen this template so immediately resolve the existing promise.\n                promise = cachedPromise;\n            } else {\n                // We haven't seen this template yet so we need to request it from\n                // the server.\n                requests.push({\n                    methodname: 'core_output_load_template_with_dependencies',\n                    args: {\n                        component: component,\n                        template: name,\n                        themename: theme,\n                        lang: $('html').attr('lang').replace(/-/g, '_')\n                    }\n                });\n                // Remember the index in the requests list for this template so that\n                // we can get the appropriate promise back.\n                var index = requests.length - 1;\n\n                // The server deferred will be resolved with a list of all of the promises\n                // that were sent in the order that they were added to the requests array.\n                promise = serverRequestsDeferred.promise()\n                    .then(function(promises) {\n                        // The promise for this template will be the one that matches the index\n                        // for it's entry in the requests array.\n                        //\n                        // Make sure the promise is added to the promises cache for this template\n                        // search key so that we don't request it again.\n                        templatePromises[searchKey] = promises[index].then(function(response) {\n                            var templateSource = null;\n\n                            // Process all of the template dependencies for this template and add\n                            // them to the caches so that we don't request them again later.\n                            response.templates.forEach(function(data) {\n                                data.component = getNormalisedComponent(data.component);\n                                // Generate the search key for this template in the response so that we\n                                // can add it to the caches.\n                                var tempSearchKey = [theme, data.component, data.name].join('/');\n                                // Cache all of the dependent templates because we'll need them to render\n                                // the requested template.\n                                templateCache[tempSearchKey] = data.value;\n\n                                if (M.cfg.templaterev > 0) {\n                                    // The template cache is enabled - set the value there.\n                                    storage.set('core_template/' + M.cfg.templaterev + ':' + tempSearchKey, data.value);\n                                }\n\n                                if (data.component == component && data.name == name) {\n                                    // This is the original template that was requested so remember it to return.\n                                    templateSource = data.value;\n                                }\n                            });\n\n                            if (response.strings.length) {\n                                // If we have strings that the template needs then warm the string cache\n                                // with them now so that we don't need to re-fetch them.\n                                str.cache_strings(response.strings.map(function(data) {\n                                    return {\n                                        component: getNormalisedComponent(data.component),\n                                        key: data.name,\n                                        value: data.value\n                                    };\n                                }));\n                            }\n\n                            // Return the original template source that the user requested.\n                            return templateSource;\n                        });\n\n                        return templatePromises[searchKey];\n                    });\n            }\n\n            return promise\n                .then(function(source) {\n                    // When we've successfully loaded the template then resolve the deferred\n                    // in the buffer so that all of the calling code can proceed.\n                    return templateDeferred.resolve(source);\n                })\n                .catch(function(error) {\n                    // If there was an error loading the template then reject the deferred\n                    // in the buffer so that all of the calling code can proceed.\n                    templateDeferred.reject(error);\n                    // Rethrow for anyone else listening.\n                    throw error;\n                });\n        });\n\n        if (requests.length) {\n            // We have requests to send so resolve the deferred with the promises.\n            serverRequestsDeferred.resolve(ajax.call(requests, true, false, false, 0, M.cfg.templaterev));\n        } else {\n            // Nothing to load so we can resolve our deferred.\n            serverRequestsDeferred.resolve();\n        }\n\n        // Once we've finished loading all of the templates then recurse to process\n        // any templates that may have been added to the buffer in the time that we\n        // were fetching.\n        $.when.apply(null, templatePromises)\n            .then(function() {\n                // Remove the templates we've loaded from the buffer.\n                loadTemplateBuffer.splice(0, templatesToLoad.length);\n                isLoadingTemplates = false;\n                processLoadTemplateBuffer();\n                return;\n            })\n            .catch(function() {\n                // Remove the templates we've loaded from the buffer.\n                loadTemplateBuffer.splice(0, templatesToLoad.length);\n                isLoadingTemplates = false;\n                processLoadTemplateBuffer();\n            });\n    };\n\n    /**\n     * Constructor\n     *\n     * Each call to templates.render gets it's own instance of this class.\n     */\n    var Renderer = function() {\n        this.requiredStrings = [];\n        this.requiredJS = [];\n        this.requiredDates = [];\n        this.currentThemeName = '';\n    };\n    // Class variables and functions.\n\n    /** @var {string[]} requiredStrings - Collection of strings found during the rendering of one template */\n    Renderer.prototype.requiredStrings = null;\n\n    /** @var {object[]} requiredDates - Collection of dates found during the rendering of one template */\n    Renderer.prototype.requiredDates = [];\n\n    /** @var {string[]} requiredJS - Collection of js blocks found during the rendering of one template */\n    Renderer.prototype.requiredJS = null;\n\n    /** @var {String} themeName for the current render */\n    Renderer.prototype.currentThemeName = '';\n\n    /**\n     * Load a template.\n     *\n     * @method getTemplate\n     * @private\n     * @param {string} templateName - should consist of the component and the name of the template like this:\n     *                              core/menu (lib/templates/menu.mustache) or\n     *                              tool_bananas/yellow (admin/tool/bananas/templates/yellow.mustache)\n     * @return {Promise} JQuery promise object resolved when the template has been fetched.\n     */\n    Renderer.prototype.getTemplate = function(templateName) {\n        var currentTheme = this.currentThemeName;\n        var searchKey = currentTheme + '/' + templateName;\n\n        // If we haven't already seen this template then buffer it.\n        var cachedPromise = getTemplatePromiseFromCache(searchKey);\n        if (cachedPromise) {\n            return cachedPromise;\n        }\n\n        // Check the buffer to see if this template has already been added.\n        var existingBufferRecords = loadTemplateBuffer.filter(function(record) {\n            return record.searchKey == searchKey;\n        });\n        if (existingBufferRecords.length) {\n            // This template is already in the buffer so just return the existing\n            // promise. No need to add it to the buffer again.\n            return existingBufferRecords[0].deferred.promise();\n        }\n\n        // This is the first time this has been requested so let's add it to the buffer\n        // to be loaded.\n        var parts = templateName.split('/');\n        var component = getNormalisedComponent(parts.shift());\n        var name = parts.join('/');\n        var deferred = $.Deferred();\n\n        // Add this template to the buffer to be loaded.\n        loadTemplateBuffer.push({\n            component: component,\n            name: name,\n            theme: currentTheme,\n            searchKey: searchKey,\n            deferred: deferred\n        });\n\n        // We know there is at least one thing in the buffer so kick off a processing run.\n        processLoadTemplateBuffer();\n        return deferred.promise();\n    };\n\n    /**\n     * Prefetch a set of templates without rendering them.\n     *\n     * @param {Array} templateNames The list of templates to fetch\n     * @param {String} currentTheme\n     */\n    Renderer.prototype.prefetchTemplates = function(templateNames, currentTheme) {\n        templateNames.forEach(function(templateName) {\n            var searchKey = currentTheme + '/' + templateName;\n\n            // If we haven't already seen this template then buffer it.\n            if (getTemplatePromiseFromCache(searchKey)) {\n                return;\n            }\n\n            // Check the buffer to see if this template has already been added.\n            var existingBufferRecords = loadTemplateBuffer.filter(function(record) {\n                return record.searchKey == searchKey;\n            });\n\n            if (existingBufferRecords.length) {\n                // This template is already in the buffer so just return the existing promise.\n                // No need to add it to the buffer again.\n                return;\n            }\n\n            // This is the first time this has been requested so let's add it to the buffer to be loaded.\n            var parts = templateName.split('/');\n            var component = getNormalisedComponent(parts.shift());\n            var name = parts.join('/');\n\n            // Add this template to the buffer to be loaded.\n            loadTemplateBuffer.push({\n                component: component,\n                name: name,\n                theme: currentTheme,\n                searchKey: searchKey,\n                deferred: $.Deferred(),\n            });\n        });\n\n        processLoadTemplateBuffer();\n    };\n\n    /**\n     * Load a partial from the cache or ajax.\n     *\n     * @method partialHelper\n     * @private\n     * @param {string} name The partial name to load.\n     * @return {string}\n     */\n    Renderer.prototype.partialHelper = function(name) {\n\n        var searchKey = this.currentThemeName + '/' + name;\n\n        if (!(searchKey in templateCache)) {\n            notification.exception(new Error('Failed to pre-fetch the template: ' + name));\n        }\n\n        return templateCache[searchKey];\n    };\n\n    /**\n     * Render a single image icon.\n     *\n     * @method renderIcon\n     * @private\n     * @param {string} key The icon key.\n     * @param {string} component The component name.\n     * @param {string} title The icon title\n     * @return {Promise}\n     */\n    Renderer.prototype.renderIcon = function(key, component, title) {\n        // Preload the module to do the icon rendering based on the theme iconsystem.\n        var modulename = config.iconsystemmodule;\n        component = getNormalisedComponent(component);\n\n        // RequireJS does not return a promise.\n        var ready = $.Deferred();\n        require([modulename], function(System) {\n            var system = new System();\n            if (!(system instanceof IconSystem)) {\n                ready.reject('Invalid icon system specified' + config.iconsystemmodule);\n            } else {\n                iconSystem = system;\n                system.init().then(ready.resolve).catch(notification.exception);\n            }\n        });\n\n        return ready.then(function(iconSystem) {\n            return this.getTemplate(iconSystem.getTemplateName());\n        }.bind(this)).then(function(template) {\n            return iconSystem.renderIcon(\n                key,\n                component,\n                title,\n                template\n            );\n        });\n    };\n\n    /**\n     * Render image icons.\n     *\n     * @method pixHelper\n     * @private\n     * @param {object} context The mustache context\n     * @param {string} sectionText The text to parse arguments from.\n     * @param {function} helper Used to render the alt attribute of the text.\n     * @return {string}\n     */\n    Renderer.prototype.pixHelper = function(context, sectionText, helper) {\n        var parts = sectionText.split(',');\n        var key = '';\n        var component = '';\n        var text = '';\n\n        if (parts.length > 0) {\n            key = helper(parts.shift().trim(), context);\n        }\n        if (parts.length > 0) {\n            component = helper(parts.shift().trim(), context);\n        }\n        if (parts.length > 0) {\n            text = helper(parts.join(',').trim(), context);\n        }\n\n        var templateName = iconSystem.getTemplateName();\n        var searchKey = this.currentThemeName + '/' + templateName;\n        var template = templateCache[searchKey];\n\n        component = getNormalisedComponent(component);\n\n        // The key might have been escaped by the JS Mustache engine which\n        // converts forward slashes to HTML entities. Let us undo that here.\n        key = key.replace(/&#x2F;/gi, '/');\n\n        return iconSystem.renderIcon(\n            key,\n            component,\n            text,\n            template\n        );\n    };\n\n    /**\n     * Render blocks of javascript and save them in an array.\n     *\n     * @method jsHelper\n     * @private\n     * @param {object} context The current mustache context.\n     * @param {string} sectionText The text to save as a js block.\n     * @param {function} helper Used to render the block.\n     * @return {string}\n     */\n    Renderer.prototype.jsHelper = function(context, sectionText, helper) {\n        this.requiredJS.push(helper(sectionText, context));\n        return '';\n    };\n\n    /**\n     * String helper used to render {{#str}}abd component { a : 'fish'}{{/str}}\n     * into a get_string call.\n     *\n     * @method stringHelper\n     * @private\n     * @param {object} context The current mustache context.\n     * @param {string} sectionText The text to parse the arguments from.\n     * @param {function} helper Used to render subsections of the text.\n     * @return {string}\n     */\n    Renderer.prototype.stringHelper = function(context, sectionText, helper) {\n        var parts = sectionText.split(',');\n        var key = '';\n        var component = '';\n        var param = '';\n        if (parts.length > 0) {\n            key = parts.shift().trim();\n        }\n        if (parts.length > 0) {\n            component = parts.shift().trim();\n        }\n        if (parts.length > 0) {\n            param = parts.join(',').trim();\n        }\n\n        component = getNormalisedComponent(component);\n\n        if (param !== '') {\n            // Allow variable expansion in the param part only.\n            param = helper(param, context);\n        }\n        // Allow json formatted $a arguments.\n        if ((param.indexOf('{') === 0) && (param.indexOf('{{') !== 0)) {\n            param = JSON.parse(param);\n        }\n\n        var index = this.requiredStrings.length;\n        this.requiredStrings.push({\n            key: key,\n            component: component,\n            param: param\n        });\n\n        // The placeholder must not use {{}} as those can be misinterpreted by the engine.\n        return '[[_s' + index + ']]';\n    };\n\n    /**\n     * String helper to render {{#cleanstr}}abd component { a : 'fish'}{{/cleanstr}}\n     * into a get_string following by an HTML escape.\n     *\n     * @method cleanStringHelper\n     * @private\n     * @param {object} context The current mustache context.\n     * @param {string} sectionText The text to parse the arguments from.\n     * @param {function} helper Used to render subsections of the text.\n     * @return {string}\n     */\n    Renderer.prototype.cleanStringHelper = function(context, sectionText, helper) {\n        var str = this.stringHelper(context, sectionText, helper);\n\n        // We're going to use [[_cx]] format for clean strings, where x is a number.\n        // Hence, replacing 's' with 'c' in the placeholder that stringHelper returns.\n        return str.replace('s', 'c');\n    };\n\n    /**\n     * Quote helper used to wrap content in quotes, and escape all special JSON characters present in the content.\n     *\n     * @method quoteHelper\n     * @private\n     * @param {object} context The current mustache context.\n     * @param {string} sectionText The text to parse the arguments from.\n     * @param {function} helper Used to render subsections of the text.\n     * @return {string}\n     */\n    Renderer.prototype.quoteHelper = function(context, sectionText, helper) {\n        var content = helper(sectionText.trim(), context);\n\n        // Escape the {{ and JSON encode.\n        // This involves wrapping {{, and }} in change delimeter tags.\n        content = JSON.stringify(content);\n        content = content.replace(/([{}]{2,3})/g, '{{=<% %>=}}$1<%={{ }}=%>');\n        return content;\n    };\n\n    /**\n     * Shorten text helper to truncate text and append a trailing ellipsis.\n     *\n     * @method shortenTextHelper\n     * @private\n     * @param {object} context The current mustache context.\n     * @param {string} sectionText The text to parse the arguments from.\n     * @param {function} helper Used to render subsections of the text.\n     * @return {string}\n     */\n    Renderer.prototype.shortenTextHelper = function(context, sectionText, helper) {\n        // Non-greedy split on comma to grab section text into the length and\n        // text parts.\n        var regex = /(.*?),(.*)/;\n        var parts = sectionText.match(regex);\n        // The length is the part matched in the first set of parethesis.\n        var length = parts[1].trim();\n        // The length is the part matched in the second set of parethesis.\n        var text = parts[2].trim();\n        var content = helper(text, context);\n        return Truncate.truncate(content, {\n            length: length,\n            words: true,\n            ellipsis: '...'\n        });\n    };\n\n    /**\n     * User date helper to render user dates from timestamps.\n     *\n     * @method userDateHelper\n     * @private\n     * @param {object} context The current mustache context.\n     * @param {string} sectionText The text to parse the arguments from.\n     * @param {function} helper Used to render subsections of the text.\n     * @return {string}\n     */\n    Renderer.prototype.userDateHelper = function(context, sectionText, helper) {\n        // Non-greedy split on comma to grab the timestamp and format.\n        var regex = /(.*?),(.*)/;\n        var parts = sectionText.match(regex);\n        var timestamp = helper(parts[1].trim(), context);\n        var format = helper(parts[2].trim(), context);\n        var index = this.requiredDates.length;\n\n        this.requiredDates.push({\n            timestamp: timestamp,\n            format: format\n        });\n\n        return '[[_t_' + index + ']]';\n    };\n\n    /**\n     * Return a helper function to be added to the context for rendering the a\n     * template.\n     *\n     * This will parse the provided text before giving it to the helper function\n     * in order to remove any disallowed nested helpers to prevent one helper\n     * from calling another.\n     *\n     * In particular to prevent the JS helper from being called from within another\n     * helper because it can lead to security issues when the JS portion is user\n     * provided.\n     *\n     * @param  {function} helperFunction The helper function to add\n     * @param  {object} context The template context for the helper function\n     * @return {Function} To be set in the context\n     */\n    Renderer.prototype.addHelperFunction = function(helperFunction, context) {\n        return function() {\n            return function(sectionText, helper) {\n                // Override the disallowed helpers in the template context with\n                // a function that returns an empty string for use when executing\n                // other helpers. This is to prevent these helpers from being\n                // executed as part of the rendering of another helper in order to\n                // prevent any potential security issues.\n                var originalHelpers = disallowedNestedHelpers.reduce(function(carry, name) {\n                    if (context.hasOwnProperty(name)) {\n                        carry[name] = context[name];\n                    }\n\n                    return carry;\n                }, {});\n\n                disallowedNestedHelpers.forEach(function(helperName) {\n                    context[helperName] = function() {\n                        return '';\n                    };\n                });\n\n                // Execute the helper with the modified context that doesn't include\n                // the disallowed nested helpers. This prevents the disallowed\n                // helpers from being called from within other helpers.\n                var result = helperFunction.apply(this, [context, sectionText, helper]);\n\n                // Restore the original helper implementation in the context so that\n                // any further rendering has access to them again.\n                for (var name in originalHelpers) {\n                    context[name] = originalHelpers[name];\n                }\n\n                return result;\n            }.bind(this);\n        }.bind(this);\n    };\n\n    /**\n     * Add some common helper functions to all context objects passed to templates.\n     * These helpers match exactly the helpers available in php.\n     *\n     * @method addHelpers\n     * @private\n     * @param {Object} context Simple types used as the context for the template.\n     * @param {String} themeName We set this multiple times, because there are async calls.\n     */\n    Renderer.prototype.addHelpers = function(context, themeName) {\n        this.currentThemeName = themeName;\n        this.requiredStrings = [];\n        this.requiredJS = [];\n        context.uniqid = (uniqInstances++);\n        context.str = this.addHelperFunction(this.stringHelper, context);\n        context.cleanstr = this.addHelperFunction(this.cleanStringHelper, context);\n        context.pix = this.addHelperFunction(this.pixHelper, context);\n        context.js = this.addHelperFunction(this.jsHelper, context);\n        context.quote = this.addHelperFunction(this.quoteHelper, context);\n        context.shortentext = this.addHelperFunction(this.shortenTextHelper, context);\n        context.userdate = this.addHelperFunction(this.userDateHelper, context);\n        context.globals = {config: config};\n        context.currentTheme = themeName;\n    };\n\n    /**\n     * Get all the JS blocks from the last rendered template.\n     *\n     * @method getJS\n     * @private\n     * @return {string}\n     */\n    Renderer.prototype.getJS = function() {\n        var js = '';\n        if (this.requiredJS.length > 0) {\n            js = this.requiredJS.join(\";\\n\");\n        }\n\n        return js;\n    };\n\n    /**\n     * Treat strings in content.\n     *\n     * The purpose of this method is to replace the placeholders found in a string\n     * with the their respective translated strings.\n     *\n     * Previously we were relying on String.replace() but the complexity increased with\n     * the numbers of strings to replace. Now we manually walk the string and stop at each\n     * placeholder we find, only then we replace it. Most of the time we will\n     * replace all the placeholders in a single run, at times we will need a few\n     * more runs when placeholders are replaced with strings that contain placeholders\n     * themselves.\n     *\n     * @param {String} content The content in which string placeholders are to be found.\n     * @param {Array} strings The strings to replace with.\n     * @return {String} The treated content.\n     */\n    Renderer.prototype.treatStringsInContent = function(content, strings) {\n        var pattern = /\\[\\[_(s|c)\\d+\\]\\]/,\n            treated,\n            index,\n            strIndex,\n            walker,\n            char,\n            strFinal,\n            isClean;\n\n        do {\n            treated = '';\n            index = content.search(pattern);\n            while (index > -1) {\n\n                // Copy the part prior to the placeholder to the treated string.\n                treated += content.substring(0, index);\n                content = content.substr(index);\n                isClean = content[3] == 'c';\n                strIndex = '';\n                walker = 4; // 4 is the length of either '[[_s' or '[[_c'.\n\n                // Walk the characters to manually extract the index of the string from the placeholder.\n                char = content.substr(walker, 1);\n                do {\n                    strIndex += char;\n                    walker++;\n                    char = content.substr(walker, 1);\n                } while (char != ']');\n\n                // Get the string, add it to the treated result, and remove the placeholder from the content to treat.\n                strFinal = strings[parseInt(strIndex, 10)];\n                if (typeof strFinal === 'undefined') {\n                    Log.debug('Could not find string for pattern [[_' + (isClean ? 'c' : 's') + strIndex + ']].');\n                    strFinal = '';\n                }\n                if (isClean) {\n                    strFinal = mustache.escape(strFinal);\n                }\n                treated += strFinal;\n                content = content.substr(6 + strIndex.length); // 6 is the length of the placeholder without the index.\n                                                               // That's either '[[_s]]' or '[[_c]]'.\n\n                // Find the next placeholder.\n                index = content.search(pattern);\n            }\n\n            // The content becomes the treated part with the rest of the content.\n            content = treated + content;\n\n            // Check if we need to walk the content again, in case strings contained placeholders.\n            index = content.search(pattern);\n\n        } while (index > -1);\n\n        return content;\n    };\n\n    /**\n     * Treat strings in content.\n     *\n     * The purpose of this method is to replace the date placeholders found in the\n     * content with the their respective translated dates.\n     *\n     * @param {String} content The content in which string placeholders are to be found.\n     * @param {Array} dates The dates to replace with.\n     * @return {String} The treated content.\n     */\n    Renderer.prototype.treatDatesInContent = function(content, dates) {\n        dates.forEach(function(date, index) {\n            var key = '\\\\[\\\\[_t_' + index + '\\\\]\\\\]';\n            var re = new RegExp(key, 'g');\n            content = content.replace(re, date);\n        });\n\n        return content;\n    };\n\n    /**\n     * Render a template and then call the callback with the result.\n     *\n     * @method doRender\n     * @private\n     * @param {string} templateSource The mustache template to render.\n     * @param {Object} context Simple types used as the context for the template.\n     * @param {String} themeName Name of the current theme.\n     * @return {Promise} object\n     */\n    Renderer.prototype.doRender = function(templateSource, context, themeName) {\n        this.currentThemeName = themeName;\n        var iconTemplate = iconSystem.getTemplateName();\n\n        var pendingPromise = new Pending('core/templates:doRender');\n        return this.getTemplate(iconTemplate).then(function() {\n            this.addHelpers(context, themeName);\n            var result = mustache.render(templateSource, context, this.partialHelper.bind(this));\n            return $.Deferred().resolve(result.trim(), this.getJS()).promise();\n        }.bind(this))\n        .then(function(html, js) {\n            if (this.requiredStrings.length > 0) {\n                return str.get_strings(this.requiredStrings).then(function(strings) {\n\n                    // Make sure string substitutions are done for the userdate\n                    // values as well.\n                    this.requiredDates = this.requiredDates.map(function(date) {\n                        return {\n                            timestamp: this.treatStringsInContent(date.timestamp, strings),\n                            format: this.treatStringsInContent(date.format, strings)\n                        };\n                    }.bind(this));\n\n                    // Why do we not do another call the render here?\n                    //\n                    // Because that would expose DOS holes. E.g.\n                    // I create an assignment called \"{{fish\" which\n                    // would get inserted in the template in the first pass\n                    // and cause the template to die on the second pass (unbalanced).\n                    html = this.treatStringsInContent(html, strings);\n                    js = this.treatStringsInContent(js, strings);\n                    return $.Deferred().resolve(html, js).promise();\n                }.bind(this));\n            }\n\n            return $.Deferred().resolve(html, js).promise();\n        }.bind(this))\n        .then(function(html, js) {\n            // This has to happen after the strings replacement because you can\n            // use the string helper in content for the user date helper.\n            if (this.requiredDates.length > 0) {\n                return UserDate.get(this.requiredDates).then(function(dates) {\n                    html = this.treatDatesInContent(html, dates);\n                    js = this.treatDatesInContent(js, dates);\n                    return $.Deferred().resolve(html, js).promise();\n                }.bind(this));\n            }\n\n            return $.Deferred().resolve(html, js).promise();\n        }.bind(this))\n        .then(function(html, js) {\n            pendingPromise.resolve();\n            return $.Deferred().resolve(html, js).promise();\n        });\n    };\n\n    /**\n     * Execute a block of JS returned from a template.\n     * Call this AFTER adding the template HTML into the DOM so the nodes can be found.\n     *\n     * @method runTemplateJS\n     * @param {string} source - A block of javascript.\n     */\n    var runTemplateJS = function(source) {\n        if (source.trim() !== '') {\n            var newscript = $('<script>').attr('type', 'text/javascript').html(source);\n            $('head').append(newscript);\n        }\n    };\n\n    /**\n     * Do some DOM replacement and trigger correct events and fire javascript.\n     *\n     * @method domReplace\n     * @private\n     * @param {JQuery} element - Element or selector to replace.\n     * @param {String} newHTML - HTML to insert / replace.\n     * @param {String} newJS - Javascript to run after the insertion.\n     * @param {Boolean} replaceChildNodes - Replace only the childnodes, alternative is to replace the entire node.\n     * @return {Array} The list of new DOM Nodes\n     * @fires event:filterContentUpdated\n     */\n    var domReplace = function(element, newHTML, newJS, replaceChildNodes) {\n        var replaceNode = $(element);\n        if (replaceNode.length) {\n            // First create the dom nodes so we have a reference to them.\n            var newNodes = $(newHTML);\n            var yuiNodes = null;\n            // Do the replacement in the page.\n            if (replaceChildNodes) {\n                // Cleanup any YUI event listeners attached to any of these nodes.\n                yuiNodes = new Y.NodeList(replaceNode.children().get());\n                yuiNodes.destroy(true);\n\n                // JQuery will cleanup after itself.\n                replaceNode.empty();\n                replaceNode.append(newNodes);\n            } else {\n                // Cleanup any YUI event listeners attached to any of these nodes.\n                yuiNodes = new Y.NodeList(replaceNode.get());\n                yuiNodes.destroy(true);\n\n                // JQuery will cleanup after itself.\n                replaceNode.replaceWith(newNodes);\n            }\n            // Run any javascript associated with the new HTML.\n            runTemplateJS(newJS);\n            // Notify all filters about the new content.\n            filterEvents.notifyFilterContentUpdated(newNodes);\n\n            return newNodes.get();\n        }\n\n        return [];\n    };\n\n    /**\n     * Scan a template source for partial tags and return a list of the found partials.\n     *\n     * @method scanForPartials\n     * @private\n     * @param {string} templateSource - source template to scan.\n     * @return {Array} List of partials.\n     */\n    Renderer.prototype.scanForPartials = function(templateSource) {\n        var tokens = mustache.parse(templateSource),\n            partials = [];\n\n        var findPartial = function(tokens, partials) {\n            var i, token;\n            for (i = 0; i < tokens.length; i++) {\n                token = tokens[i];\n                if (token[0] == '>' || token[0] == '<') {\n                    partials.push(token[1]);\n                }\n                if (token.length > 4) {\n                    findPartial(token[4], partials);\n                }\n            }\n        };\n\n        findPartial(tokens, partials);\n\n        return partials;\n    };\n\n    /**\n     * Load a template and scan it for partials. Recursively fetch the partials.\n     *\n     * @method cachePartials\n     * @private\n     * @param {string} templateName - should consist of the component and the name of the template like this:\n     *                              core/menu (lib/templates/menu.mustache) or\n     *                              tool_bananas/yellow (admin/tool/bananas/templates/yellow.mustache)\n     * @param {Array} parentage - A list of requested partials in this render chain.\n     * @return {Promise} JQuery promise object resolved when all partials are in the cache.\n     */\n    Renderer.prototype.cachePartials = function(templateName, parentage) {\n        var searchKey = this.currentThemeName + '/' + templateName;\n\n        if (searchKey in cachePartialPromises) {\n            return cachePartialPromises[searchKey];\n        }\n\n        // This promise will not be resolved until all child partials are also resolved and ready.\n        // We create it here to allow us to check for recursive inclusion of templates.\n        // Keep track of the requested partials in this chain.\n        parentage = parentage || [searchKey];\n\n        cachePartialPromises[searchKey] = $.Deferred();\n\n        this.getTemplate(templateName)\n        .then(function(templateSource) {\n            var partials = this.scanForPartials(templateSource);\n            var uniquePartials = partials.filter(function(partialName) {\n                // Check for recursion.\n\n                if (parentage.indexOf(this.currentThemeName + '/' + partialName) >= 0) {\n                    // Ignore templates which include a parent template already requested in the current chain.\n                    return false;\n                }\n\n                // Ignore templates that include themselves.\n                return partialName != templateName;\n            }.bind(this));\n\n            // Fetch any partial which has not already been fetched.\n            var fetchThemAll = uniquePartials.map(function(partialName) {\n                parentage.push(this.currentThemeName + '/' + partialName);\n                return this.cachePartials(partialName, parentage);\n            }.bind(this));\n\n            // Resolve the templateName promise when all of the children are resolved.\n            return $.when.apply($, fetchThemAll)\n            .then(function() {\n                return cachePartialPromises[searchKey].resolve(templateSource);\n            });\n        }.bind(this))\n        .catch(cachePartialPromises[searchKey].reject);\n\n        return cachePartialPromises[searchKey];\n    };\n\n    /**\n     * Load a template and call doRender on it.\n     *\n     * @method render\n     * @private\n     * @param {string} templateName - should consist of the component and the name of the template like this:\n     *                              core/menu (lib/templates/menu.mustache) or\n     *                              tool_bananas/yellow (admin/tool/bananas/templates/yellow.mustache)\n     * @param {Object} context - Could be array, string or simple value for the context of the template.\n     * @param {string} themeName - Name of the current theme.\n     * @return {Promise} JQuery promise object resolved when the template has been rendered.\n     */\n    Renderer.prototype.render = function(templateName, context, themeName) {\n        if (typeof (themeName) === \"undefined\") {\n            // System context by default.\n            themeName = config.theme;\n        }\n\n        this.currentThemeName = themeName;\n\n        // Preload the module to do the icon rendering based on the theme iconsystem.\n        var modulename = config.iconsystemmodule;\n\n        var ready = $.Deferred();\n        require([modulename], function(System) {\n            var system = new System();\n            if (!(system instanceof IconSystem)) {\n                ready.reject('Invalid icon system specified' + config.iconsystem);\n            } else {\n                iconSystem = system;\n                system.init().then(ready.resolve).catch(notification.exception);\n            }\n        });\n\n        return ready.then(function() {\n                return this.cachePartials(templateName);\n            }.bind(this)).then(function(templateSource) {\n                return this.doRender(templateSource, context, themeName);\n            }.bind(this));\n    };\n\n    /**\n     * Prepend some HTML to a node and trigger events and fire javascript.\n     *\n     * @method domPrepend\n     * @private\n     * @param {jQuery|String} element - Element or selector to prepend HTML to\n     * @param {String} html - HTML to prepend\n     * @param {String} js - Javascript to run after we prepend the html\n     * @return {Array} The list of new DOM Nodes\n     * @fires event:filterContentUpdated\n     */\n    var domPrepend = function(element, html, js) {\n        var node = $(element);\n        if (node.length) {\n            // Prepend the html.\n            var newContent = $(html);\n            node.prepend(newContent);\n            // Run any javascript associated with the new HTML.\n            runTemplateJS(js);\n            // Notify all filters about the new content.\n            filterEvents.notifyFilterContentUpdated(node);\n\n            return newContent.get();\n        }\n\n        return [];\n    };\n\n    /**\n     * Append some HTML to a node and trigger events and fire javascript.\n     *\n     * @method domAppend\n     * @private\n     * @param {jQuery|String} element - Element or selector to append HTML to\n     * @param {String} html - HTML to append\n     * @param {String} js - Javascript to run after we append the html\n     * @return {Array} The list of new DOM Nodes\n     * @fires event:filterContentUpdated\n     */\n    var domAppend = function(element, html, js) {\n        var node = $(element);\n        if (node.length) {\n            // Append the html.\n            var newContent = $(html);\n            node.append(newContent);\n            // Run any javascript associated with the new HTML.\n            runTemplateJS(js);\n            // Notify all filters about the new content.\n            filterEvents.notifyFilterContentUpdated(node);\n\n            return newContent.get();\n        }\n\n        return [];\n    };\n\n    return /** @alias module:core/templates */ {\n        // Public variables and functions.\n        /**\n         * Every call to render creates a new instance of the class and calls render on it. This\n         * means each render call has it's own class variables.\n         *\n         * @method render\n         * @private\n         * @param {string} templateName - should consist of the component and the name of the template like this:\n         *                              core/menu (lib/templates/menu.mustache) or\n         *                              tool_bananas/yellow (admin/tool/bananas/templates/yellow.mustache)\n         * @param {Object} context - Could be array, string or simple value for the context of the template.\n         * @param {string} themeName - Name of the current theme.\n         * @return {Promise} JQuery promise object resolved when the template has been rendered.\n         */\n        render: function(templateName, context, themeName) {\n            var renderer = new Renderer();\n            return renderer.render(templateName, context, themeName);\n        },\n\n        /**\n         * Prefetch a set of templates without rendering them.\n         *\n         * @method getTemplate\n         * @param {Array} templateNames The list of templates to fetch\n         * @param {String} themeName\n         * @returns {Promise}\n         */\n        prefetchTemplates: function(templateNames, themeName) {\n            var renderer = new Renderer();\n\n            if (typeof themeName === \"undefined\") {\n                // System context by default.\n                themeName = config.theme;\n            }\n\n            return renderer.prefetchTemplates(templateNames, themeName);\n        },\n\n        /**\n         * Every call to render creates a new instance of the class and calls render on it. This\n         * means each render call has it's own class variables.\n         *\n         * This alernate to the standard .render() function returns the html and js in a single object suitable for a\n         * native Promise.\n         *\n         * @method renderForPromise\n         * @private\n         * @param {string} templateName - should consist of the component and the name of the template like this:\n         *                              core/menu (lib/templates/menu.mustache) or\n         *                              tool_bananas/yellow (admin/tool/bananas/templates/yellow.mustache)\n         * @param {Object} context - Could be array, string or simple value for the context of the template.\n         * @param {string} themeName - Name of the current theme.\n         * @return {Promise} JQuery promise object resolved when the template has been rendered.\n         */\n        renderForPromise: function(templateName, context, themeName) {\n            var renderer = new Renderer();\n            return renderer.render(templateName, context, themeName)\n            .then(function(html, js) {\n                return {\n                    html: html,\n                    js: js,\n                };\n            });\n        },\n\n        /**\n         * Every call to renderIcon creates a new instance of the class and calls renderIcon on it. This\n         * means each render call has it's own class variables.\n         *\n         * @method renderIcon\n         * @public\n         * @param {string} key - Icon key.\n         * @param {string} component - Icon component\n         * @param {string} title - Icon title\n         * @return {Promise} JQuery promise object resolved when the pix has been rendered.\n         */\n        renderPix: function(key, component, title) {\n            var renderer = new Renderer();\n            return renderer.renderIcon(\n                key,\n                getNormalisedComponent(component),\n                title\n            );\n        },\n\n        /**\n         * Execute a block of JS returned from a template.\n         * Call this AFTER adding the template HTML into the DOM so the nodes can be found.\n         *\n         * @method runTemplateJS\n         * @param {string} source - A block of javascript.\n         */\n        runTemplateJS: runTemplateJS,\n\n        /**\n         * Replace a node in the page with some new HTML and run the JS.\n         *\n         * @method replaceNodeContents\n         * @param {JQuery} element - Element or selector to replace.\n         * @param {String} newHTML - HTML to insert / replace.\n         * @param {String} newJS - Javascript to run after the insertion.\n         * @return {Array} The list of new DOM Nodes\n         */\n        replaceNodeContents: function(element, newHTML, newJS) {\n            return domReplace(element, newHTML, newJS, true);\n        },\n\n        /**\n         * Insert a node in the page with some new HTML and run the JS.\n         *\n         * @method replaceNode\n         * @param {JQuery} element - Element or selector to replace.\n         * @param {String} newHTML - HTML to insert / replace.\n         * @param {String} newJS - Javascript to run after the insertion.\n         * @return {Array} The list of new DOM Nodes\n         */\n        replaceNode: function(element, newHTML, newJS) {\n            return domReplace(element, newHTML, newJS, false);\n        },\n\n        /**\n         * Prepend some HTML to a node and trigger events and fire javascript.\n         *\n         * @method prependNodeContents\n         * @param {jQuery|String} element - Element or selector to prepend HTML to\n         * @param {String} html - HTML to prepend\n         * @param {String} js - Javascript to run after we prepend the html\n         * @return {Array} The list of new DOM Nodes\n         */\n        prependNodeContents: function(element, html, js) {\n            return domPrepend(element, html, js);\n        },\n\n        /**\n         * Append some HTML to a node and trigger events and fire javascript.\n         *\n         * @method appendNodeContents\n         * @param {jQuery|String} element - Element or selector to append HTML to\n         * @param {String} html - HTML to append\n         * @param {String} js - Javascript to run after we append the html\n         * @return {Array} The list of new DOM Nodes\n         */\n        appendNodeContents: function(element, html, js) {\n            return domAppend(element, html, js);\n        },\n    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\ No newline at end of file
+{"version":3,"file":"templates.min.js","sources":["../src/templates.js"],"sourcesContent":["// This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Template renderer for Moodle. Load and render Moodle templates with Mustache.\n *\n * @module     core/templates\n * @copyright  2015 Damyon Wiese <damyon@moodle.com>\n * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n * @since      2.9\n */\ndefine([\n    'core/mustache',\n    'jquery',\n    'core/ajax',\n    'core/str',\n    'core/notification',\n    'core/url',\n    'core/config',\n    'core/localstorage',\n    'core/icon_system',\n    'core_filters/events',\n    'core/yui',\n    'core/log',\n    'core/truncate',\n    'core/user_date',\n    'core/pending',\n],\nfunction(\n    mustache,\n    $,\n    ajax,\n    str,\n    notification,\n    coreurl,\n    config,\n    storage,\n    IconSystem,\n    filterEvents,\n    Y,\n    Log,\n    Truncate,\n    UserDate,\n    Pending\n) {\n\n    // Module variables.\n    /** @var {Number} uniqInstances Count of times this constructor has been called. */\n    var uniqInstances = 0;\n\n    /** @var {String[]} templateCache - Cache of already loaded template strings */\n    var templateCache = {};\n\n    /** @var {Promise[]} templatePromises - Cache of already loaded template promises */\n    var templatePromises = {};\n\n    /** @var {Promise[]} cachePartialPromises - Cache of already loaded template partial promises */\n    var cachePartialPromises = {};\n\n    /** @var {Object} iconSystem - Object extending core/iconsystem */\n    var iconSystem = {};\n\n    /** @var {Object[]} loadTemplateBuffer - List of templates to be loaded */\n    var loadTemplateBuffer = [];\n\n    /** @var {Bool} isLoadingTemplates - Whether templates are currently being loaded */\n    var isLoadingTemplates = false;\n\n    /** @var {Array} disallowedNestedHelpers - List of helpers that can't be called within other helpers */\n    var disallowedNestedHelpers = ['js'];\n\n    /**\n     * Normalise the provided component such that '', 'moodle', and 'core' are treated consistently.\n     *\n     * @param   {String} component\n     * @returns {String}\n     */\n    var getNormalisedComponent = function(component) {\n        if (component) {\n            if (component !== 'moodle' && component !== 'core') {\n                return component;\n            }\n        }\n\n        return 'core';\n    };\n\n    /**\n     * Search the various caches for a template promise for the given search key.\n     * The search key should be in the format <theme>/<component>/<template> e.g. boost/core/modal.\n     *\n     * If the template is found in any of the caches it will populate the other caches with\n     * the same data as well.\n     *\n     * @param {String} searchKey The template search key in the format <theme>/<component>/<template> e.g. boost/core/modal\n     * @return {Object} jQuery promise resolved with the template source\n     */\n    var getTemplatePromiseFromCache = function(searchKey) {\n        // First try the cache of promises.\n        if (searchKey in templatePromises) {\n            return templatePromises[searchKey];\n        }\n\n        // Check the module cache.\n        if (searchKey in templateCache) {\n            // Add this to the promises cache for future.\n            templatePromises[searchKey] = $.Deferred().resolve(templateCache[searchKey]).promise();\n            return templatePromises[searchKey];\n        }\n\n        if (M.cfg.templaterev <= 0) {\n            // Template caching is disabled. Do not store in persistent storage.\n            return null;\n        }\n\n        // Now try local storage.\n        var cached = storage.get('core_template/' + M.cfg.templaterev + ':' + searchKey);\n        if (cached) {\n            // Add this to the module cache for future.\n            templateCache[searchKey] = cached;\n            // Add this to the promises cache for future.\n            templatePromises[searchKey] = $.Deferred().resolve(cached).promise();\n            return templatePromises[searchKey];\n        }\n\n        return null;\n    };\n\n    /**\n     * Take all of the templates waiting in the buffer and load them from the server\n     * or from the cache.\n     *\n     * All of the templates that need to be loaded from the server will be batched up\n     * and sent in a single network request.\n     */\n    var processLoadTemplateBuffer = function() {\n        if (!loadTemplateBuffer.length) {\n            return;\n        }\n\n        if (isLoadingTemplates) {\n            return;\n        }\n\n        isLoadingTemplates = true;\n        // Grab any templates waiting in the buffer.\n        var templatesToLoad = loadTemplateBuffer.slice();\n        // This will be resolved with the list of promises for the server request.\n        var serverRequestsDeferred = $.Deferred();\n        var requests = [];\n        // Get a list of promises for each of the templates we need to load.\n        var templatePromises = templatesToLoad.map(function(templateData) {\n            var component = getNormalisedComponent(templateData.component);\n            var name = templateData.name;\n            var searchKey = templateData.searchKey;\n            var theme = templateData.theme;\n            var templateDeferred = templateData.deferred;\n            var promise = null;\n\n            // Double check to see if this template happened to have landed in the\n            // cache as a dependency of an earlier template.\n            var cachedPromise = getTemplatePromiseFromCache(searchKey);\n            if (cachedPromise) {\n                // We've seen this template so immediately resolve the existing promise.\n                promise = cachedPromise;\n            } else {\n                // We haven't seen this template yet so we need to request it from\n                // the server.\n                requests.push({\n                    methodname: 'core_output_load_template_with_dependencies',\n                    args: {\n                        component: component,\n                        template: name,\n                        themename: theme,\n                        lang: $('html').attr('lang').replace(/-/g, '_')\n                    }\n                });\n                // Remember the index in the requests list for this template so that\n                // we can get the appropriate promise back.\n                var index = requests.length - 1;\n\n                // The server deferred will be resolved with a list of all of the promises\n                // that were sent in the order that they were added to the requests array.\n                promise = serverRequestsDeferred.promise()\n                    .then(function(promises) {\n                        // The promise for this template will be the one that matches the index\n                        // for it's entry in the requests array.\n                        //\n                        // Make sure the promise is added to the promises cache for this template\n                        // search key so that we don't request it again.\n                        templatePromises[searchKey] = promises[index].then(function(response) {\n                            var templateSource = null;\n\n                            // Process all of the template dependencies for this template and add\n                            // them to the caches so that we don't request them again later.\n                            response.templates.forEach(function(data) {\n                                data.component = getNormalisedComponent(data.component);\n                                // Generate the search key for this template in the response so that we\n                                // can add it to the caches.\n                                var tempSearchKey = [theme, data.component, data.name].join('/');\n                                // Cache all of the dependent templates because we'll need them to render\n                                // the requested template.\n                                templateCache[tempSearchKey] = data.value;\n\n                                if (M.cfg.templaterev > 0) {\n                                    // The template cache is enabled - set the value there.\n                                    storage.set('core_template/' + M.cfg.templaterev + ':' + tempSearchKey, data.value);\n                                }\n\n                                if (data.component == component && data.name == name) {\n                                    // This is the original template that was requested so remember it to return.\n                                    templateSource = data.value;\n                                }\n                            });\n\n                            if (response.strings.length) {\n                                // If we have strings that the template needs then warm the string cache\n                                // with them now so that we don't need to re-fetch them.\n                                str.cache_strings(response.strings.map(function(data) {\n                                    return {\n                                        component: getNormalisedComponent(data.component),\n                                        key: data.name,\n                                        value: data.value\n                                    };\n                                }));\n                            }\n\n                            // Return the original template source that the user requested.\n                            return templateSource;\n                        });\n\n                        return templatePromises[searchKey];\n                    });\n            }\n\n            return promise\n                .then(function(source) {\n                    // When we've successfully loaded the template then resolve the deferred\n                    // in the buffer so that all of the calling code can proceed.\n                    return templateDeferred.resolve(source);\n                })\n                .catch(function(error) {\n                    // If there was an error loading the template then reject the deferred\n                    // in the buffer so that all of the calling code can proceed.\n                    templateDeferred.reject(error);\n                    // Rethrow for anyone else listening.\n                    throw error;\n                });\n        });\n\n        if (requests.length) {\n            // We have requests to send so resolve the deferred with the promises.\n            serverRequestsDeferred.resolve(ajax.call(requests, true, false, false, 0, M.cfg.templaterev));\n        } else {\n            // Nothing to load so we can resolve our deferred.\n            serverRequestsDeferred.resolve();\n        }\n\n        // Once we've finished loading all of the templates then recurse to process\n        // any templates that may have been added to the buffer in the time that we\n        // were fetching.\n        $.when.apply(null, templatePromises)\n            .then(function() {\n                // Remove the templates we've loaded from the buffer.\n                loadTemplateBuffer.splice(0, templatesToLoad.length);\n                isLoadingTemplates = false;\n                processLoadTemplateBuffer();\n                return;\n            })\n            .catch(function() {\n                // Remove the templates we've loaded from the buffer.\n                loadTemplateBuffer.splice(0, templatesToLoad.length);\n                isLoadingTemplates = false;\n                processLoadTemplateBuffer();\n            });\n    };\n\n    /**\n     * Constructor\n     *\n     * Each call to templates.render gets it's own instance of this class.\n     */\n    var Renderer = function() {\n        this.requiredStrings = [];\n        this.requiredJS = [];\n        this.requiredDates = [];\n        this.currentThemeName = '';\n    };\n    // Class variables and functions.\n\n    /** @var {string[]} requiredStrings - Collection of strings found during the rendering of one template */\n    Renderer.prototype.requiredStrings = null;\n\n    /** @var {object[]} requiredDates - Collection of dates found during the rendering of one template */\n    Renderer.prototype.requiredDates = [];\n\n    /** @var {string[]} requiredJS - Collection of js blocks found during the rendering of one template */\n    Renderer.prototype.requiredJS = null;\n\n    /** @var {String} themeName for the current render */\n    Renderer.prototype.currentThemeName = '';\n\n    /**\n     * Load a template.\n     *\n     * @method getTemplate\n     * @private\n     * @param {string} templateName - should consist of the component and the name of the template like this:\n     *                              core/menu (lib/templates/menu.mustache) or\n     *                              tool_bananas/yellow (admin/tool/bananas/templates/yellow.mustache)\n     * @return {Promise} JQuery promise object resolved when the template has been fetched.\n     */\n    Renderer.prototype.getTemplate = function(templateName) {\n        var currentTheme = this.currentThemeName;\n        var searchKey = currentTheme + '/' + templateName;\n\n        // If we haven't already seen this template then buffer it.\n        var cachedPromise = getTemplatePromiseFromCache(searchKey);\n        if (cachedPromise) {\n            return cachedPromise;\n        }\n\n        // Check the buffer to see if this template has already been added.\n        var existingBufferRecords = loadTemplateBuffer.filter(function(record) {\n            return record.searchKey == searchKey;\n        });\n        if (existingBufferRecords.length) {\n            // This template is already in the buffer so just return the existing\n            // promise. No need to add it to the buffer again.\n            return existingBufferRecords[0].deferred.promise();\n        }\n\n        // This is the first time this has been requested so let's add it to the buffer\n        // to be loaded.\n        var parts = templateName.split('/');\n        var component = getNormalisedComponent(parts.shift());\n        var name = parts.join('/');\n        var deferred = $.Deferred();\n\n        // Add this template to the buffer to be loaded.\n        loadTemplateBuffer.push({\n            component: component,\n            name: name,\n            theme: currentTheme,\n            searchKey: searchKey,\n            deferred: deferred\n        });\n\n        // We know there is at least one thing in the buffer so kick off a processing run.\n        processLoadTemplateBuffer();\n        return deferred.promise();\n    };\n\n    /**\n     * Prefetch a set of templates without rendering them.\n     *\n     * @param {Array} templateNames The list of templates to fetch\n     * @param {String} currentTheme\n     */\n    Renderer.prototype.prefetchTemplates = function(templateNames, currentTheme) {\n        templateNames.forEach(function(templateName) {\n            var searchKey = currentTheme + '/' + templateName;\n\n            // If we haven't already seen this template then buffer it.\n            if (getTemplatePromiseFromCache(searchKey)) {\n                return;\n            }\n\n            // Check the buffer to see if this template has already been added.\n            var existingBufferRecords = loadTemplateBuffer.filter(function(record) {\n                return record.searchKey == searchKey;\n            });\n\n            if (existingBufferRecords.length) {\n                // This template is already in the buffer so just return the existing promise.\n                // No need to add it to the buffer again.\n                return;\n            }\n\n            // This is the first time this has been requested so let's add it to the buffer to be loaded.\n            var parts = templateName.split('/');\n            var component = getNormalisedComponent(parts.shift());\n            var name = parts.join('/');\n\n            // Add this template to the buffer to be loaded.\n            loadTemplateBuffer.push({\n                component: component,\n                name: name,\n                theme: currentTheme,\n                searchKey: searchKey,\n                deferred: $.Deferred(),\n            });\n        });\n\n        processLoadTemplateBuffer();\n    };\n\n    /**\n     * Load a partial from the cache or ajax.\n     *\n     * @method partialHelper\n     * @private\n     * @param {string} name The partial name to load.\n     * @return {string}\n     */\n    Renderer.prototype.partialHelper = function(name) {\n\n        var searchKey = this.currentThemeName + '/' + name;\n\n        if (!(searchKey in templateCache)) {\n            notification.exception(new Error('Failed to pre-fetch the template: ' + name));\n        }\n\n        return templateCache[searchKey];\n    };\n\n    /**\n     * Render a single image icon.\n     *\n     * @method renderIcon\n     * @private\n     * @param {string} key The icon key.\n     * @param {string} component The component name.\n     * @param {string} title The icon title\n     * @return {Promise}\n     */\n    Renderer.prototype.renderIcon = function(key, component, title) {\n        // Preload the module to do the icon rendering based on the theme iconsystem.\n        var modulename = config.iconsystemmodule;\n        component = getNormalisedComponent(component);\n\n        // RequireJS does not return a promise.\n        var ready = $.Deferred();\n        require([modulename], function(System) {\n            var system = new System();\n            if (!(system instanceof IconSystem)) {\n                ready.reject('Invalid icon system specified' + config.iconsystemmodule);\n            } else {\n                iconSystem = system;\n                system.init().then(ready.resolve).catch(notification.exception);\n            }\n        });\n\n        return ready.then(function(iconSystem) {\n            return this.getTemplate(iconSystem.getTemplateName());\n        }.bind(this)).then(function(template) {\n            return iconSystem.renderIcon(\n                key,\n                component,\n                title,\n                template\n            );\n        });\n    };\n\n    /**\n     * Render image icons.\n     *\n     * @method pixHelper\n     * @private\n     * @param {object} context The mustache context\n     * @param {string} sectionText The text to parse arguments from.\n     * @param {function} helper Used to render the alt attribute of the text.\n     * @return {string}\n     */\n    Renderer.prototype.pixHelper = function(context, sectionText, helper) {\n        var parts = sectionText.split(',');\n        var key = '';\n        var component = '';\n        var text = '';\n\n        if (parts.length > 0) {\n            key = helper(parts.shift().trim(), context);\n        }\n        if (parts.length > 0) {\n            component = helper(parts.shift().trim(), context);\n        }\n        if (parts.length > 0) {\n            text = helper(parts.join(',').trim(), context);\n        }\n\n        var templateName = iconSystem.getTemplateName();\n        var searchKey = this.currentThemeName + '/' + templateName;\n        var template = templateCache[searchKey];\n\n        component = getNormalisedComponent(component);\n\n        // The key might have been escaped by the JS Mustache engine which\n        // converts forward slashes to HTML entities. Let us undo that here.\n        key = key.replace(/&#x2F;/gi, '/');\n\n        return iconSystem.renderIcon(\n            key,\n            component,\n            text,\n            template\n        );\n    };\n\n    /**\n     * Render blocks of javascript and save them in an array.\n     *\n     * @method jsHelper\n     * @private\n     * @param {object} context The current mustache context.\n     * @param {string} sectionText The text to save as a js block.\n     * @param {function} helper Used to render the block.\n     * @return {string}\n     */\n    Renderer.prototype.jsHelper = function(context, sectionText, helper) {\n        this.requiredJS.push(helper(sectionText, context));\n        return '';\n    };\n\n    /**\n     * String helper used to render {{#str}}abd component { a : 'fish'}{{/str}}\n     * into a get_string call.\n     *\n     * @method stringHelper\n     * @private\n     * @param {object} context The current mustache context.\n     * @param {string} sectionText The text to parse the arguments from.\n     * @param {function} helper Used to render subsections of the text.\n     * @return {string}\n     */\n    Renderer.prototype.stringHelper = function(context, sectionText, helper) {\n        var parts = sectionText.split(',');\n        var key = '';\n        var component = '';\n        var param = '';\n        if (parts.length > 0) {\n            key = parts.shift().trim();\n        }\n        if (parts.length > 0) {\n            component = parts.shift().trim();\n        }\n        if (parts.length > 0) {\n            param = parts.join(',').trim();\n        }\n\n        component = getNormalisedComponent(component);\n\n        if (param !== '') {\n            // Allow variable expansion in the param part only.\n            param = helper(param, context);\n        }\n\n        // Allow json formatted $a arguments.\n        // Added double quote after left curly bracket to differentiate between string and JSON string.\n        if (param.indexOf('{\"') === 0) {\n            // If it can't be parsed then the string is not a JSON format.\n            try {\n                const parsedParam = JSON.parse(param);\n                // Handle non-exception-throwing cases, e.g. null, integer, boolean.\n                if (parsedParam && typeof parsedParam === \"object\") {\n                    param = parsedParam;\n                }\n            } catch (err) {\n                // This was probably not JSON.\n                // Keep the error message visible.\n                window.console.warn(err.message);\n            }\n        }\n\n        var index = this.requiredStrings.length;\n        this.requiredStrings.push({\n            key: key,\n            component: component,\n            param: param\n        });\n\n        // The placeholder must not use {{}} as those can be misinterpreted by the engine.\n        return '[[_s' + index + ']]';\n    };\n\n    /**\n     * String helper to render {{#cleanstr}}abd component { a : 'fish'}{{/cleanstr}}\n     * into a get_string following by an HTML escape.\n     *\n     * @method cleanStringHelper\n     * @private\n     * @param {object} context The current mustache context.\n     * @param {string} sectionText The text to parse the arguments from.\n     * @param {function} helper Used to render subsections of the text.\n     * @return {string}\n     */\n    Renderer.prototype.cleanStringHelper = function(context, sectionText, helper) {\n        var str = this.stringHelper(context, sectionText, helper);\n\n        // We're going to use [[_cx]] format for clean strings, where x is a number.\n        // Hence, replacing 's' with 'c' in the placeholder that stringHelper returns.\n        return str.replace('s', 'c');\n    };\n\n    /**\n     * Quote helper used to wrap content in quotes, and escape all special JSON characters present in the content.\n     *\n     * @method quoteHelper\n     * @private\n     * @param {object} context The current mustache context.\n     * @param {string} sectionText The text to parse the arguments from.\n     * @param {function} helper Used to render subsections of the text.\n     * @return {string}\n     */\n    Renderer.prototype.quoteHelper = function(context, sectionText, helper) {\n        var content = helper(sectionText.trim(), context);\n\n        // Escape the {{ and JSON encode.\n        // This involves wrapping {{, and }} in change delimeter tags.\n        content = JSON.stringify(content);\n        content = content.replace(/([{}]{2,3})/g, '{{=<% %>=}}$1<%={{ }}=%>');\n        return content;\n    };\n\n    /**\n     * Shorten text helper to truncate text and append a trailing ellipsis.\n     *\n     * @method shortenTextHelper\n     * @private\n     * @param {object} context The current mustache context.\n     * @param {string} sectionText The text to parse the arguments from.\n     * @param {function} helper Used to render subsections of the text.\n     * @return {string}\n     */\n    Renderer.prototype.shortenTextHelper = function(context, sectionText, helper) {\n        // Non-greedy split on comma to grab section text into the length and\n        // text parts.\n        var regex = /(.*?),(.*)/;\n        var parts = sectionText.match(regex);\n        // The length is the part matched in the first set of parethesis.\n        var length = parts[1].trim();\n        // The length is the part matched in the second set of parethesis.\n        var text = parts[2].trim();\n        var content = helper(text, context);\n        return Truncate.truncate(content, {\n            length: length,\n            words: true,\n            ellipsis: '...'\n        });\n    };\n\n    /**\n     * User date helper to render user dates from timestamps.\n     *\n     * @method userDateHelper\n     * @private\n     * @param {object} context The current mustache context.\n     * @param {string} sectionText The text to parse the arguments from.\n     * @param {function} helper Used to render subsections of the text.\n     * @return {string}\n     */\n    Renderer.prototype.userDateHelper = function(context, sectionText, helper) {\n        // Non-greedy split on comma to grab the timestamp and format.\n        var regex = /(.*?),(.*)/;\n        var parts = sectionText.match(regex);\n        var timestamp = helper(parts[1].trim(), context);\n        var format = helper(parts[2].trim(), context);\n        var index = this.requiredDates.length;\n\n        this.requiredDates.push({\n            timestamp: timestamp,\n            format: format\n        });\n\n        return '[[_t_' + index + ']]';\n    };\n\n    /**\n     * Return a helper function to be added to the context for rendering the a\n     * template.\n     *\n     * This will parse the provided text before giving it to the helper function\n     * in order to remove any disallowed nested helpers to prevent one helper\n     * from calling another.\n     *\n     * In particular to prevent the JS helper from being called from within another\n     * helper because it can lead to security issues when the JS portion is user\n     * provided.\n     *\n     * @param  {function} helperFunction The helper function to add\n     * @param  {object} context The template context for the helper function\n     * @return {Function} To be set in the context\n     */\n    Renderer.prototype.addHelperFunction = function(helperFunction, context) {\n        return function() {\n            return function(sectionText, helper) {\n                // Override the disallowed helpers in the template context with\n                // a function that returns an empty string for use when executing\n                // other helpers. This is to prevent these helpers from being\n                // executed as part of the rendering of another helper in order to\n                // prevent any potential security issues.\n                var originalHelpers = disallowedNestedHelpers.reduce(function(carry, name) {\n                    if (context.hasOwnProperty(name)) {\n                        carry[name] = context[name];\n                    }\n\n                    return carry;\n                }, {});\n\n                disallowedNestedHelpers.forEach(function(helperName) {\n                    context[helperName] = function() {\n                        return '';\n                    };\n                });\n\n                // Execute the helper with the modified context that doesn't include\n                // the disallowed nested helpers. This prevents the disallowed\n                // helpers from being called from within other helpers.\n                var result = helperFunction.apply(this, [context, sectionText, helper]);\n\n                // Restore the original helper implementation in the context so that\n                // any further rendering has access to them again.\n                for (var name in originalHelpers) {\n                    context[name] = originalHelpers[name];\n                }\n\n                return result;\n            }.bind(this);\n        }.bind(this);\n    };\n\n    /**\n     * Add some common helper functions to all context objects passed to templates.\n     * These helpers match exactly the helpers available in php.\n     *\n     * @method addHelpers\n     * @private\n     * @param {Object} context Simple types used as the context for the template.\n     * @param {String} themeName We set this multiple times, because there are async calls.\n     */\n    Renderer.prototype.addHelpers = function(context, themeName) {\n        this.currentThemeName = themeName;\n        this.requiredStrings = [];\n        this.requiredJS = [];\n        context.uniqid = (uniqInstances++);\n        context.str = this.addHelperFunction(this.stringHelper, context);\n        context.cleanstr = this.addHelperFunction(this.cleanStringHelper, context);\n        context.pix = this.addHelperFunction(this.pixHelper, context);\n        context.js = this.addHelperFunction(this.jsHelper, context);\n        context.quote = this.addHelperFunction(this.quoteHelper, context);\n        context.shortentext = this.addHelperFunction(this.shortenTextHelper, context);\n        context.userdate = this.addHelperFunction(this.userDateHelper, context);\n        context.globals = {config: config};\n        context.currentTheme = themeName;\n    };\n\n    /**\n     * Get all the JS blocks from the last rendered template.\n     *\n     * @method getJS\n     * @private\n     * @return {string}\n     */\n    Renderer.prototype.getJS = function() {\n        var js = '';\n        if (this.requiredJS.length > 0) {\n            js = this.requiredJS.join(\";\\n\");\n        }\n\n        return js;\n    };\n\n    /**\n     * Treat strings in content.\n     *\n     * The purpose of this method is to replace the placeholders found in a string\n     * with the their respective translated strings.\n     *\n     * Previously we were relying on String.replace() but the complexity increased with\n     * the numbers of strings to replace. Now we manually walk the string and stop at each\n     * placeholder we find, only then we replace it. Most of the time we will\n     * replace all the placeholders in a single run, at times we will need a few\n     * more runs when placeholders are replaced with strings that contain placeholders\n     * themselves.\n     *\n     * @param {String} content The content in which string placeholders are to be found.\n     * @param {Array} strings The strings to replace with.\n     * @return {String} The treated content.\n     */\n    Renderer.prototype.treatStringsInContent = function(content, strings) {\n        var pattern = /\\[\\[_(s|c)\\d+\\]\\]/,\n            treated,\n            index,\n            strIndex,\n            walker,\n            char,\n            strFinal,\n            isClean;\n\n        do {\n            treated = '';\n            index = content.search(pattern);\n            while (index > -1) {\n\n                // Copy the part prior to the placeholder to the treated string.\n                treated += content.substring(0, index);\n                content = content.substr(index);\n                isClean = content[3] == 'c';\n                strIndex = '';\n                walker = 4; // 4 is the length of either '[[_s' or '[[_c'.\n\n                // Walk the characters to manually extract the index of the string from the placeholder.\n                char = content.substr(walker, 1);\n                do {\n                    strIndex += char;\n                    walker++;\n                    char = content.substr(walker, 1);\n                } while (char != ']');\n\n                // Get the string, add it to the treated result, and remove the placeholder from the content to treat.\n                strFinal = strings[parseInt(strIndex, 10)];\n                if (typeof strFinal === 'undefined') {\n                    Log.debug('Could not find string for pattern [[_' + (isClean ? 'c' : 's') + strIndex + ']].');\n                    strFinal = '';\n                }\n                if (isClean) {\n                    strFinal = mustache.escape(strFinal);\n                }\n                treated += strFinal;\n                content = content.substr(6 + strIndex.length); // 6 is the length of the placeholder without the index.\n                                                               // That's either '[[_s]]' or '[[_c]]'.\n\n                // Find the next placeholder.\n                index = content.search(pattern);\n            }\n\n            // The content becomes the treated part with the rest of the content.\n            content = treated + content;\n\n            // Check if we need to walk the content again, in case strings contained placeholders.\n            index = content.search(pattern);\n\n        } while (index > -1);\n\n        return content;\n    };\n\n    /**\n     * Treat strings in content.\n     *\n     * The purpose of this method is to replace the date placeholders found in the\n     * content with the their respective translated dates.\n     *\n     * @param {String} content The content in which string placeholders are to be found.\n     * @param {Array} dates The dates to replace with.\n     * @return {String} The treated content.\n     */\n    Renderer.prototype.treatDatesInContent = function(content, dates) {\n        dates.forEach(function(date, index) {\n            var key = '\\\\[\\\\[_t_' + index + '\\\\]\\\\]';\n            var re = new RegExp(key, 'g');\n            content = content.replace(re, date);\n        });\n\n        return content;\n    };\n\n    /**\n     * Render a template and then call the callback with the result.\n     *\n     * @method doRender\n     * @private\n     * @param {string} templateSource The mustache template to render.\n     * @param {Object} context Simple types used as the context for the template.\n     * @param {String} themeName Name of the current theme.\n     * @return {Promise} object\n     */\n    Renderer.prototype.doRender = function(templateSource, context, themeName) {\n        this.currentThemeName = themeName;\n        var iconTemplate = iconSystem.getTemplateName();\n\n        var pendingPromise = new Pending('core/templates:doRender');\n        return this.getTemplate(iconTemplate).then(function() {\n            this.addHelpers(context, themeName);\n            var result = mustache.render(templateSource, context, this.partialHelper.bind(this));\n            return $.Deferred().resolve(result.trim(), this.getJS()).promise();\n        }.bind(this))\n        .then(function(html, js) {\n            if (this.requiredStrings.length > 0) {\n                return str.get_strings(this.requiredStrings).then(function(strings) {\n\n                    // Make sure string substitutions are done for the userdate\n                    // values as well.\n                    this.requiredDates = this.requiredDates.map(function(date) {\n                        return {\n                            timestamp: this.treatStringsInContent(date.timestamp, strings),\n                            format: this.treatStringsInContent(date.format, strings)\n                        };\n                    }.bind(this));\n\n                    // Why do we not do another call the render here?\n                    //\n                    // Because that would expose DOS holes. E.g.\n                    // I create an assignment called \"{{fish\" which\n                    // would get inserted in the template in the first pass\n                    // and cause the template to die on the second pass (unbalanced).\n                    html = this.treatStringsInContent(html, strings);\n                    js = this.treatStringsInContent(js, strings);\n                    return $.Deferred().resolve(html, js).promise();\n                }.bind(this));\n            }\n\n            return $.Deferred().resolve(html, js).promise();\n        }.bind(this))\n        .then(function(html, js) {\n            // This has to happen after the strings replacement because you can\n            // use the string helper in content for the user date helper.\n            if (this.requiredDates.length > 0) {\n                return UserDate.get(this.requiredDates).then(function(dates) {\n                    html = this.treatDatesInContent(html, dates);\n                    js = this.treatDatesInContent(js, dates);\n                    return $.Deferred().resolve(html, js).promise();\n                }.bind(this));\n            }\n\n            return $.Deferred().resolve(html, js).promise();\n        }.bind(this))\n        .then(function(html, js) {\n            pendingPromise.resolve();\n            return $.Deferred().resolve(html, js).promise();\n        });\n    };\n\n    /**\n     * Execute a block of JS returned from a template.\n     * Call this AFTER adding the template HTML into the DOM so the nodes can be found.\n     *\n     * @method runTemplateJS\n     * @param {string} source - A block of javascript.\n     */\n    var runTemplateJS = function(source) {\n        if (source.trim() !== '') {\n            var newscript = $('<script>').attr('type', 'text/javascript').html(source);\n            $('head').append(newscript);\n        }\n    };\n\n    /**\n     * Do some DOM replacement and trigger correct events and fire javascript.\n     *\n     * @method domReplace\n     * @private\n     * @param {JQuery} element - Element or selector to replace.\n     * @param {String} newHTML - HTML to insert / replace.\n     * @param {String} newJS - Javascript to run after the insertion.\n     * @param {Boolean} replaceChildNodes - Replace only the childnodes, alternative is to replace the entire node.\n     * @return {Array} The list of new DOM Nodes\n     * @fires event:filterContentUpdated\n     */\n    var domReplace = function(element, newHTML, newJS, replaceChildNodes) {\n        var replaceNode = $(element);\n        if (replaceNode.length) {\n            // First create the dom nodes so we have a reference to them.\n            var newNodes = $(newHTML);\n            var yuiNodes = null;\n            // Do the replacement in the page.\n            if (replaceChildNodes) {\n                // Cleanup any YUI event listeners attached to any of these nodes.\n                yuiNodes = new Y.NodeList(replaceNode.children().get());\n                yuiNodes.destroy(true);\n\n                // JQuery will cleanup after itself.\n                replaceNode.empty();\n                replaceNode.append(newNodes);\n            } else {\n                // Cleanup any YUI event listeners attached to any of these nodes.\n                yuiNodes = new Y.NodeList(replaceNode.get());\n                yuiNodes.destroy(true);\n\n                // JQuery will cleanup after itself.\n                replaceNode.replaceWith(newNodes);\n            }\n            // Run any javascript associated with the new HTML.\n            runTemplateJS(newJS);\n            // Notify all filters about the new content.\n            filterEvents.notifyFilterContentUpdated(newNodes);\n\n            return newNodes.get();\n        }\n\n        return [];\n    };\n\n    /**\n     * Scan a template source for partial tags and return a list of the found partials.\n     *\n     * @method scanForPartials\n     * @private\n     * @param {string} templateSource - source template to scan.\n     * @return {Array} List of partials.\n     */\n    Renderer.prototype.scanForPartials = function(templateSource) {\n        var tokens = mustache.parse(templateSource),\n            partials = [];\n\n        var findPartial = function(tokens, partials) {\n            var i, token;\n            for (i = 0; i < tokens.length; i++) {\n                token = tokens[i];\n                if (token[0] == '>' || token[0] == '<') {\n                    partials.push(token[1]);\n                }\n                if (token.length > 4) {\n                    findPartial(token[4], partials);\n                }\n            }\n        };\n\n        findPartial(tokens, partials);\n\n        return partials;\n    };\n\n    /**\n     * Load a template and scan it for partials. Recursively fetch the partials.\n     *\n     * @method cachePartials\n     * @private\n     * @param {string} templateName - should consist of the component and the name of the template like this:\n     *                              core/menu (lib/templates/menu.mustache) or\n     *                              tool_bananas/yellow (admin/tool/bananas/templates/yellow.mustache)\n     * @param {Array} parentage - A list of requested partials in this render chain.\n     * @return {Promise} JQuery promise object resolved when all partials are in the cache.\n     */\n    Renderer.prototype.cachePartials = function(templateName, parentage) {\n        var searchKey = this.currentThemeName + '/' + templateName;\n\n        if (searchKey in cachePartialPromises) {\n            return cachePartialPromises[searchKey];\n        }\n\n        // This promise will not be resolved until all child partials are also resolved and ready.\n        // We create it here to allow us to check for recursive inclusion of templates.\n        // Keep track of the requested partials in this chain.\n        parentage = parentage || [searchKey];\n\n        cachePartialPromises[searchKey] = $.Deferred();\n\n        this.getTemplate(templateName)\n        .then(function(templateSource) {\n            var partials = this.scanForPartials(templateSource);\n            var uniquePartials = partials.filter(function(partialName) {\n                // Check for recursion.\n\n                if (parentage.indexOf(this.currentThemeName + '/' + partialName) >= 0) {\n                    // Ignore templates which include a parent template already requested in the current chain.\n                    return false;\n                }\n\n                // Ignore templates that include themselves.\n                return partialName != templateName;\n            }.bind(this));\n\n            // Fetch any partial which has not already been fetched.\n            var fetchThemAll = uniquePartials.map(function(partialName) {\n                parentage.push(this.currentThemeName + '/' + partialName);\n                return this.cachePartials(partialName, parentage);\n            }.bind(this));\n\n            // Resolve the templateName promise when all of the children are resolved.\n            return $.when.apply($, fetchThemAll)\n            .then(function() {\n                return cachePartialPromises[searchKey].resolve(templateSource);\n            });\n        }.bind(this))\n        .catch(cachePartialPromises[searchKey].reject);\n\n        return cachePartialPromises[searchKey];\n    };\n\n    /**\n     * Load a template and call doRender on it.\n     *\n     * @method render\n     * @private\n     * @param {string} templateName - should consist of the component and the name of the template like this:\n     *                              core/menu (lib/templates/menu.mustache) or\n     *                              tool_bananas/yellow (admin/tool/bananas/templates/yellow.mustache)\n     * @param {Object} context - Could be array, string or simple value for the context of the template.\n     * @param {string} themeName - Name of the current theme.\n     * @return {Promise} JQuery promise object resolved when the template has been rendered.\n     */\n    Renderer.prototype.render = function(templateName, context, themeName) {\n        if (typeof (themeName) === \"undefined\") {\n            // System context by default.\n            themeName = config.theme;\n        }\n\n        this.currentThemeName = themeName;\n\n        // Preload the module to do the icon rendering based on the theme iconsystem.\n        var modulename = config.iconsystemmodule;\n\n        var ready = $.Deferred();\n        require([modulename], function(System) {\n            var system = new System();\n            if (!(system instanceof IconSystem)) {\n                ready.reject('Invalid icon system specified' + config.iconsystem);\n            } else {\n                iconSystem = system;\n                system.init().then(ready.resolve).catch(notification.exception);\n            }\n        });\n\n        return ready.then(function() {\n                return this.cachePartials(templateName);\n            }.bind(this)).then(function(templateSource) {\n                return this.doRender(templateSource, context, themeName);\n            }.bind(this));\n    };\n\n    /**\n     * Prepend some HTML to a node and trigger events and fire javascript.\n     *\n     * @method domPrepend\n     * @private\n     * @param {jQuery|String} element - Element or selector to prepend HTML to\n     * @param {String} html - HTML to prepend\n     * @param {String} js - Javascript to run after we prepend the html\n     * @return {Array} The list of new DOM Nodes\n     * @fires event:filterContentUpdated\n     */\n    var domPrepend = function(element, html, js) {\n        var node = $(element);\n        if (node.length) {\n            // Prepend the html.\n            var newContent = $(html);\n            node.prepend(newContent);\n            // Run any javascript associated with the new HTML.\n            runTemplateJS(js);\n            // Notify all filters about the new content.\n            filterEvents.notifyFilterContentUpdated(node);\n\n            return newContent.get();\n        }\n\n        return [];\n    };\n\n    /**\n     * Append some HTML to a node and trigger events and fire javascript.\n     *\n     * @method domAppend\n     * @private\n     * @param {jQuery|String} element - Element or selector to append HTML to\n     * @param {String} html - HTML to append\n     * @param {String} js - Javascript to run after we append the html\n     * @return {Array} The list of new DOM Nodes\n     * @fires event:filterContentUpdated\n     */\n    var domAppend = function(element, html, js) {\n        var node = $(element);\n        if (node.length) {\n            // Append the html.\n            var newContent = $(html);\n            node.append(newContent);\n            // Run any javascript associated with the new HTML.\n            runTemplateJS(js);\n            // Notify all filters about the new content.\n            filterEvents.notifyFilterContentUpdated(node);\n\n            return newContent.get();\n        }\n\n        return [];\n    };\n\n    return /** @alias module:core/templates */ {\n        // Public variables and functions.\n        /**\n         * Every call to render creates a new instance of the class and calls render on it. This\n         * means each render call has it's own class variables.\n         *\n         * @method render\n         * @private\n         * @param {string} templateName - should consist of the component and the name of the template like this:\n         *                              core/menu (lib/templates/menu.mustache) or\n         *                              tool_bananas/yellow (admin/tool/bananas/templates/yellow.mustache)\n         * @param {Object} context - Could be array, string or simple value for the context of the template.\n         * @param {string} themeName - Name of the current theme.\n         * @return {Promise} JQuery promise object resolved when the template has been rendered.\n         */\n        render: function(templateName, context, themeName) {\n            var renderer = new Renderer();\n            return renderer.render(templateName, context, themeName);\n        },\n\n        /**\n         * Prefetch a set of templates without rendering them.\n         *\n         * @method getTemplate\n         * @param {Array} templateNames The list of templates to fetch\n         * @param {String} themeName\n         * @returns {Promise}\n         */\n        prefetchTemplates: function(templateNames, themeName) {\n            var renderer = new Renderer();\n\n            if (typeof themeName === \"undefined\") {\n                // System context by default.\n                themeName = config.theme;\n            }\n\n            return renderer.prefetchTemplates(templateNames, themeName);\n        },\n\n        /**\n         * Every call to render creates a new instance of the class and calls render on it. This\n         * means each render call has it's own class variables.\n         *\n         * This alernate to the standard .render() function returns the html and js in a single object suitable for a\n         * native Promise.\n         *\n         * @method renderForPromise\n         * @private\n         * @param {string} templateName - should consist of the component and the name of the template like this:\n         *                              core/menu (lib/templates/menu.mustache) or\n         *                              tool_bananas/yellow (admin/tool/bananas/templates/yellow.mustache)\n         * @param {Object} context - Could be array, string or simple value for the context of the template.\n         * @param {string} themeName - Name of the current theme.\n         * @return {Promise} JQuery promise object resolved when the template has been rendered.\n         */\n        renderForPromise: function(templateName, context, themeName) {\n            var renderer = new Renderer();\n            return renderer.render(templateName, context, themeName)\n            .then(function(html, js) {\n                return {\n                    html: html,\n                    js: js,\n                };\n            });\n        },\n\n        /**\n         * Every call to renderIcon creates a new instance of the class and calls renderIcon on it. This\n         * means each render call has it's own class variables.\n         *\n         * @method renderIcon\n         * @public\n         * @param {string} key - Icon key.\n         * @param {string} component - Icon component\n         * @param {string} title - Icon title\n         * @return {Promise} JQuery promise object resolved when the pix has been rendered.\n         */\n        renderPix: function(key, component, title) {\n            var renderer = new Renderer();\n            return renderer.renderIcon(\n                key,\n                getNormalisedComponent(component),\n                title\n            );\n        },\n\n        /**\n         * Execute a block of JS returned from a template.\n         * Call this AFTER adding the template HTML into the DOM so the nodes can be found.\n         *\n         * @method runTemplateJS\n         * @param {string} source - A block of javascript.\n         */\n        runTemplateJS: runTemplateJS,\n\n        /**\n         * Replace a node in the page with some new HTML and run the JS.\n         *\n         * @method replaceNodeContents\n         * @param {JQuery} element - Element or selector to replace.\n         * @param {String} newHTML - HTML to insert / replace.\n         * @param {String} newJS - Javascript to run after the insertion.\n         * @return {Array} The list of new DOM Nodes\n         */\n        replaceNodeContents: function(element, newHTML, newJS) {\n            return domReplace(element, newHTML, newJS, true);\n        },\n\n        /**\n         * Insert a node in the page with some new HTML and run the JS.\n         *\n         * @method replaceNode\n         * @param {JQuery} element - Element or selector to replace.\n         * @param {String} newHTML - HTML to insert / replace.\n         * @param {String} newJS - Javascript to run after the insertion.\n         * @return {Array} The list of new DOM Nodes\n         */\n        replaceNode: function(element, newHTML, newJS) {\n            return domReplace(element, newHTML, newJS, false);\n        },\n\n        /**\n         * Prepend some HTML to a node and trigger events and fire javascript.\n         *\n         * @method prependNodeContents\n         * @param {jQuery|String} element - Element or selector to prepend HTML to\n         * @param {String} html - HTML to prepend\n         * @param {String} js - Javascript to run after we prepend the html\n         * @return {Array} The list of new DOM Nodes\n         */\n        prependNodeContents: function(element, html, js) {\n            return domPrepend(element, html, js);\n        },\n\n        /**\n         * Append some HTML to a node and trigger events and fire javascript.\n         *\n         * @method appendNodeContents\n         * @param {jQuery|String} element - Element or selector to append HTML to\n         * @param {String} html - HTML to append\n         * @param {String} js - Javascript to run after we append the html\n         * @return 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\ No newline at end of file
diff --git a/lib/amd/src/templates.js b/lib/amd/src/templates.js
index fb53430966a..a2d06e790fe 100644
--- a/lib/amd/src/templates.js
+++ b/lib/amd/src/templates.js
@@ -556,9 +556,22 @@ function(
             // Allow variable expansion in the param part only.
             param = helper(param, context);
         }
+
         // Allow json formatted $a arguments.
-        if ((param.indexOf('{') === 0) && (param.indexOf('{{') !== 0)) {
-            param = JSON.parse(param);
+        // Added double quote after left curly bracket to differentiate between string and JSON string.
+        if (param.indexOf('{"') === 0) {
+            // If it can't be parsed then the string is not a JSON format.
+            try {
+                const parsedParam = JSON.parse(param);
+                // Handle non-exception-throwing cases, e.g. null, integer, boolean.
+                if (parsedParam && typeof parsedParam === "object") {
+                    param = parsedParam;
+                }
+            } catch (err) {
+                // This was probably not JSON.
+                // Keep the error message visible.
+                window.console.warn(err.message);
+            }
         }
 
         var index = this.requiredStrings.length;