From 4f96d7ac924bef4c92f536cbeae3690b89d49acb Mon Sep 17 00:00:00 2001
From: Shamim Rezaie <shamim@moodle.com>
Date: Thu, 5 Aug 2021 17:15:49 +1000
Subject: [PATCH 1/3] MDL-70721 core: a new mustache helper to clean string
 after get_string

---
 lib/amd/build/templates.min.js                |  2 +-
 lib/amd/build/templates.min.js.map            |  2 +-
 lib/amd/src/templates.js                      | 36 ++++++++--
 .../output/mustache_clean_string_helper.php   | 68 +++++++++++++++++++
 lib/outputrenderers.php                       |  2 +
 .../mustache_clean_string_helper_test.php     | 56 +++++++++++++++
 lib/upgrade.txt                               |  1 +
 7 files changed, 160 insertions(+), 7 deletions(-)
 create mode 100644 lib/classes/output/mustache_clean_string_helper.php
 create mode 100644 lib/tests/output/mustache_clean_string_helper_test.php

diff --git a/lib/amd/build/templates.min.js b/lib/amd/build/templates.min.js
index 36b4c671519..23d541ec828 100644
--- a/lib/amd/build/templates.min.js
+++ b/lib/amd/build/templates.min.js
@@ -1,2 +1,2 @@
-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(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o){var p=0,q={},r={},s={},t={},u=[],v=!1,w=["js"],x=function(a){if(a){if("moodle"!==a&&"core"!==a){return a}}return"core"},y=function(a){if(a in r){return r[a]}if(a in q){r[a]=b.Deferred().resolve(q[a]).promise();return r[a]}if(0>=M.cfg.templaterev){return null}var c=h.get("core_template/"+M.cfg.templaterev+":"+a);if(c){q[a]=c;r[a]=b.Deferred().resolve(c).promise();return r[a]}return null},z=function(){if(!u.length){return}if(v){return}v=!0;var a=u.slice(),e=b.Deferred(),f=[],g=a.map(function(a){var c=x(a.component),i=a.name,j=a.searchKey,k=a.theme,l=a.deferred,m=null,n=y(j);if(n){m=n}else{f.push({methodname:"core_output_load_template_with_dependencies",args:{component:c,template:i,themename:k,lang:b("html").attr("lang").replace(/-/g,"_")}});var o=f.length-1;m=e.promise().then(function(a){g[j]=a[o].then(function(a){var b=null;a.templates.forEach(function(a){a.component=x(a.component);var d=[k,a.component,a.name].join("/");q[d]=a.value;if(0<M.cfg.templaterev){h.set("core_template/"+M.cfg.templaterev+":"+d,a.value)}if(a.component==c&&a.name==i){b=a.value}});if(a.strings.length){d.cache_strings(a.strings.map(function(a){return{component:x(a.component),key:a.name,value:a.value}}))}return b});return g[j]})}return m.then(function(a){return l.resolve(a)}).catch(function(a){l.reject(a);throw a})});if(f.length){e.resolve(c.call(f,!0,!1,!1,0,M.cfg.templaterev))}else{e.resolve()}b.when.apply(null,g).then(function(){u.splice(0,a.length);v=!1;z()}).catch(function(){u.splice(0,a.length);v=!1;z()})},A=function(){this.requiredStrings=[];this.requiredJS=[];this.requiredDates=[];this.currentThemeName=""};A.prototype.requiredStrings=null;A.prototype.requiredDates=[];A.prototype.requiredJS=null;A.prototype.currentThemeName="";A.prototype.getTemplate=function(a){var c=this.currentThemeName,d=c+"/"+a,e=y(d);if(e){return e}var f=u.filter(function(a){return a.searchKey==d});if(f.length){return f[0].deferred.promise()}var g=a.split("/"),h=x(g.shift()),i=g.join("/"),j=b.Deferred();u.push({component:h,name:i,theme:c,searchKey:d,deferred:j});z();return j.promise()};A.prototype.prefetchTemplates=function(a,c){a.forEach(function(a){var d=c+"/"+a;if(y(d)){return}var e=u.filter(function(a){return a.searchKey==d});if(e.length){return}var f=a.split("/"),g=x(f.shift()),h=f.join("/");u.push({component:g,name:h,theme:c,searchKey:d,deferred:b.Deferred()})});z()};A.prototype.partialHelper=function(a){var b=this.currentThemeName+"/"+a;if(!(b in q)){e.exception(new Error("Failed to pre-fetch the template: "+a))}return q[b]};A.prototype.renderIcon=function(a,c,d){var f=g.iconsystemmodule;c=x(c);var h=b.Deferred();require([f],function(a){var b=new a;if(!(b instanceof i)){h.reject("Invalid icon system specified"+g.iconsystemmodule)}else{t=b;b.init().then(h.resolve).catch(e.exception)}});return h.then(function(a){return this.getTemplate(a.getTemplateName())}.bind(this)).then(function(b){return t.renderIcon(a,c,d,b)})};A.prototype.pixHelper=function(a,b,c){var d=b.split(","),e="",f="",g="";if(0<d.length){e=c(d.shift().trim(),a)}if(0<d.length){f=c(d.shift().trim(),a)}if(0<d.length){g=c(d.join(",").trim(),a)}var h=t.getTemplateName(),i=this.currentThemeName+"/"+h,j=q[i];f=x(f);e=e.replace(/&#x2F;/gi,"/");return t.renderIcon(e,f,g,j)};A.prototype.jsHelper=function(a,b,c){this.requiredJS.push(c(b,a));return""};A.prototype.stringHelper=function(a,b,c){var d=b.split(","),e="",f="",g="";if(0<d.length){e=d.shift().trim()}if(0<d.length){f=d.shift().trim()}if(0<d.length){g=d.join(",").trim()}f=x(f);if(""!==g){g=c(g,a)}if(0===g.indexOf("{")&&0!==g.indexOf("{{")){g=JSON.parse(g)}var h=this.requiredStrings.length;this.requiredStrings.push({key:e,component:f,param:g});return"[[_s"+h+"]]"};A.prototype.quoteHelper=function(a,b,c){var d=c(b.trim(),a);d=d.replace(/"/g,"\\\"").replace(/\t/g,"&#9;").replace(/([{}]{2,3})/g,"{{=<% %>=}}$1<%={{ }}=%>").replace(/(\r\n|\r|\n)/g,"&#x0a;");return"\""+d+"\""};A.prototype.shortenTextHelper=function(a,b,c){var d=b.match(/(.*?),(.*)/),e=d[1].trim(),f=d[2].trim(),g=c(f,a);return m.truncate(g,{length:e,words:!0,ellipsis:"..."})};A.prototype.userDateHelper=function(a,b,c){var d=b.match(/(.*?),(.*)/),e=c(d[1].trim(),a),f=c(d[2].trim(),a),g=this.requiredDates.length;this.requiredDates.push({timestamp:e,format:f});return"[[_t_"+g+"]]"};A.prototype.addHelperFunction=function(a,b){return function(){return function(c,d){var e=w.reduce(function(a,c){if(b.hasOwnProperty(c)){a[c]=b[c]}return a},{});w.forEach(function(a){b[a]=function(){return""}});var f=a.apply(this,[b,c,d]);for(var g in e){b[g]=e[g]}return f}.bind(this)}.bind(this)};A.prototype.addHelpers=function(a,b){this.currentThemeName=b;this.requiredStrings=[];this.requiredJS=[];a.uniqid=p++;a.str=this.addHelperFunction(this.stringHelper,a);a.pix=this.addHelperFunction(this.pixHelper,a);a.js=this.addHelperFunction(this.jsHelper,a);a.quote=this.addHelperFunction(this.quoteHelper,a);a.shortentext=this.addHelperFunction(this.shortenTextHelper,a);a.userdate=this.addHelperFunction(this.userDateHelper,a);a.globals={config:g};a.currentTheme=b};A.prototype.getJS=function(){var a="";if(0<this.requiredJS.length){a=this.requiredJS.join(";\n")}return a};A.prototype.treatStringsInContent=function(a,b){var c=/\[\[_s\d+\]\]/,d,e,f,g,h,i;do{d="";e=a.search(c);while(-1<e){d+=a.substring(0,e);a=a.substr(e);f="";g=4;h=a.substr(g,1);do{f+=h;g++;h=a.substr(g,1)}while("]"!=h);i=b[parseInt(f,10)];if("undefined"==typeof i){l.debug("Could not find string for pattern [[_s"+f+"]].");i=""}d+=i;a=a.substr(6+f.length);e=a.search(c)}a=d+a;e=a.search(c)}while(-1<e);return a};A.prototype.treatDatesInContent=function(a,b){b.forEach(function(b,c){var d=new RegExp("\\[\\[_t_"+c+"\\]\\]","g");a=a.replace(d,b)});return a};A.prototype.doRender=function(c,e,f){this.currentThemeName=f;var g=t.getTemplateName(),h=new o("core/templates:doRender");return this.getTemplate(g).then(function(){this.addHelpers(e,f);var d=a.render(c,e,this.partialHelper.bind(this));return b.Deferred().resolve(d.trim(),this.getJS()).promise()}.bind(this)).then(function(a,c){if(0<this.requiredStrings.length){return d.get_strings(this.requiredStrings).then(function(d){this.requiredDates=this.requiredDates.map(function(a){return{timestamp:this.treatStringsInContent(a.timestamp,d),format:this.treatStringsInContent(a.format,d)}}.bind(this));a=this.treatStringsInContent(a,d);c=this.treatStringsInContent(c,d);return b.Deferred().resolve(a,c).promise()}.bind(this))}return b.Deferred().resolve(a,c).promise()}.bind(this)).then(function(a,c){if(0<this.requiredDates.length){return n.get(this.requiredDates).then(function(d){a=this.treatDatesInContent(a,d);c=this.treatDatesInContent(c,d);return b.Deferred().resolve(a,c).promise()}.bind(this))}return b.Deferred().resolve(a,c).promise()}.bind(this)).then(function(a,c){h.resolve();return b.Deferred().resolve(a,c).promise()})};var B=function(a){if(""!==a.trim()){var c=b("<script>").attr("type","text/javascript").html(a);b("head").append(c)}},C=function(a,c,d,e){var f=b(a);if(f.length){var g=b(c),h=null;if(e){h=new k.NodeList(f.children().get());h.destroy(!0);f.empty();f.append(g)}else{h=new k.NodeList(f.get());h.destroy(!0);f.replaceWith(g)}B(d);j.notifyFilterContentUpdated(g);return g.get()}return[]};A.prototype.scanForPartials=function(b){var c=a.parse(b),d=[],e=function(a,b){var c,d;for(c=0;c<a.length;c++){d=a[c];if(">"==d[0]||"<"==d[0]){b.push(d[1])}if(4<d.length){e(d[4],b)}}};e(c,d);return d};A.prototype.cachePartials=function(a,c){var d=this.currentThemeName+"/"+a;if(d in s){return s[d]}c=c||[d];s[d]=b.Deferred();this.getTemplate(a).then(function(e){var f=this.scanForPartials(e),g=f.filter(function(b){if(0<=c.indexOf(this.currentThemeName+"/"+b)){return!1}return b!=a}.bind(this)),h=g.map(function(a){c.push(this.currentThemeName+"/"+a);return this.cachePartials(a,c)}.bind(this));return b.when.apply(b,h).then(function(){return s[d].resolve(e)})}.bind(this)).catch(s[d].reject);return s[d]};A.prototype.render=function(a,c,d){if("undefined"==typeof d){d=g.theme}this.currentThemeName=d;var f=g.iconsystemmodule,h=b.Deferred();require([f],function(a){var b=new a;if(!(b instanceof i)){h.reject("Invalid icon system specified"+g.iconsystem)}else{t=b;b.init().then(h.resolve).catch(e.exception)}});return h.then(function(){return this.cachePartials(a)}.bind(this)).then(function(a){return this.doRender(a,c,d)}.bind(this))};var D=function(a,c,d){var e=b(a);if(e.length){var f=b(c);e.prepend(f);B(d);j.notifyFilterContentUpdated(e);return f.get()}return[]},E=function(a,c,d){var e=b(a);if(e.length){var f=b(c);e.append(f);B(d);j.notifyFilterContentUpdated(e);return f.get()}return[]};return{render:function render(a,b,c){var d=new A;return d.render(a,b,c)},prefetchTemplates:function prefetchTemplates(a,b){var c=new A;if("undefined"==typeof b){b=g.theme}return c.prefetchTemplates(a,b)},renderForPromise:function renderForPromise(a,b,c){var d=new A;return d.render(a,b,c).then(function(a,b){return{html:a,js:b}})},renderPix:function renderPix(a,b,c){var d=new A;return d.renderIcon(a,x(b),c)},runTemplateJS:B,replaceNodeContents:function replaceNodeContents(a,b,c){return C(a,b,c,!0)},replaceNode:function replaceNode(a,b,c){return C(a,b,c,!1)},prependNodeContents:function prependNodeContents(a,b,c){return D(a,b,c)},appendNodeContents:function appendNodeContents(a,b,c){return E(a,b,c)}}});
+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(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o){var p=0,q={},r={},s={},t={},u=[],v=!1,w=["js"],x=function(a){if(a){if("moodle"!==a&&"core"!==a){return a}}return"core"},y=function(a){if(a in r){return r[a]}if(a in q){r[a]=b.Deferred().resolve(q[a]).promise();return r[a]}if(0>=M.cfg.templaterev){return null}var c=h.get("core_template/"+M.cfg.templaterev+":"+a);if(c){q[a]=c;r[a]=b.Deferred().resolve(c).promise();return r[a]}return null},z=function(){if(!u.length){return}if(v){return}v=!0;var a=u.slice(),e=b.Deferred(),f=[],g=a.map(function(a){var c=x(a.component),i=a.name,j=a.searchKey,k=a.theme,l=a.deferred,m=null,n=y(j);if(n){m=n}else{f.push({methodname:"core_output_load_template_with_dependencies",args:{component:c,template:i,themename:k,lang:b("html").attr("lang").replace(/-/g,"_")}});var o=f.length-1;m=e.promise().then(function(a){g[j]=a[o].then(function(a){var b=null;a.templates.forEach(function(a){a.component=x(a.component);var d=[k,a.component,a.name].join("/");q[d]=a.value;if(0<M.cfg.templaterev){h.set("core_template/"+M.cfg.templaterev+":"+d,a.value)}if(a.component==c&&a.name==i){b=a.value}});if(a.strings.length){d.cache_strings(a.strings.map(function(a){return{component:x(a.component),key:a.name,value:a.value}}))}return b});return g[j]})}return m.then(function(a){return l.resolve(a)}).catch(function(a){l.reject(a);throw a})});if(f.length){e.resolve(c.call(f,!0,!1,!1,0,M.cfg.templaterev))}else{e.resolve()}b.when.apply(null,g).then(function(){u.splice(0,a.length);v=!1;z()}).catch(function(){u.splice(0,a.length);v=!1;z()})},A=function(){this.requiredStrings=[];this.requiredJS=[];this.requiredDates=[];this.currentThemeName=""};A.prototype.requiredStrings=null;A.prototype.requiredDates=[];A.prototype.requiredJS=null;A.prototype.currentThemeName="";A.prototype.getTemplate=function(a){var c=this.currentThemeName,d=c+"/"+a,e=y(d);if(e){return e}var f=u.filter(function(a){return a.searchKey==d});if(f.length){return f[0].deferred.promise()}var g=a.split("/"),h=x(g.shift()),i=g.join("/"),j=b.Deferred();u.push({component:h,name:i,theme:c,searchKey:d,deferred:j});z();return j.promise()};A.prototype.prefetchTemplates=function(a,c){a.forEach(function(a){var d=c+"/"+a;if(y(d)){return}var e=u.filter(function(a){return a.searchKey==d});if(e.length){return}var f=a.split("/"),g=x(f.shift()),h=f.join("/");u.push({component:g,name:h,theme:c,searchKey:d,deferred:b.Deferred()})});z()};A.prototype.partialHelper=function(a){var b=this.currentThemeName+"/"+a;if(!(b in q)){e.exception(new Error("Failed to pre-fetch the template: "+a))}return q[b]};A.prototype.renderIcon=function(a,c,d){var f=g.iconsystemmodule;c=x(c);var h=b.Deferred();require([f],function(a){var b=new a;if(!(b instanceof i)){h.reject("Invalid icon system specified"+g.iconsystemmodule)}else{t=b;b.init().then(h.resolve).catch(e.exception)}});return h.then(function(a){return this.getTemplate(a.getTemplateName())}.bind(this)).then(function(b){return t.renderIcon(a,c,d,b)})};A.prototype.pixHelper=function(a,b,c){var d=b.split(","),e="",f="",g="";if(0<d.length){e=c(d.shift().trim(),a)}if(0<d.length){f=c(d.shift().trim(),a)}if(0<d.length){g=c(d.join(",").trim(),a)}var h=t.getTemplateName(),i=this.currentThemeName+"/"+h,j=q[i];f=x(f);e=e.replace(/&#x2F;/gi,"/");return t.renderIcon(e,f,g,j)};A.prototype.jsHelper=function(a,b,c){this.requiredJS.push(c(b,a));return""};A.prototype.stringHelper=function(a,b,c){var d=b.split(","),e="",f="",g="";if(0<d.length){e=d.shift().trim()}if(0<d.length){f=d.shift().trim()}if(0<d.length){g=d.join(",").trim()}f=x(f);if(""!==g){g=c(g,a)}if(0===g.indexOf("{")&&0!==g.indexOf("{{")){g=JSON.parse(g)}var h=this.requiredStrings.length;this.requiredStrings.push({key:e,component:f,param:g});return"[[_s"+h+"]]"};A.prototype.cleanStringHelper=function(a,b,c){var d=this.stringHelper(a,b,c);return d.replace("s","c")};A.prototype.quoteHelper=function(a,b,c){var d=c(b.trim(),a);d=d.replace(/"/g,"\\\"").replace(/\t/g,"&#9;").replace(/([{}]{2,3})/g,"{{=<% %>=}}$1<%={{ }}=%>").replace(/(\r\n|\r|\n)/g,"&#x0a;");return"\""+d+"\""};A.prototype.shortenTextHelper=function(a,b,c){var d=b.match(/(.*?),(.*)/),e=d[1].trim(),f=d[2].trim(),g=c(f,a);return m.truncate(g,{length:e,words:!0,ellipsis:"..."})};A.prototype.userDateHelper=function(a,b,c){var d=b.match(/(.*?),(.*)/),e=c(d[1].trim(),a),f=c(d[2].trim(),a),g=this.requiredDates.length;this.requiredDates.push({timestamp:e,format:f});return"[[_t_"+g+"]]"};A.prototype.addHelperFunction=function(a,b){return function(){return function(c,d){var e=w.reduce(function(a,c){if(b.hasOwnProperty(c)){a[c]=b[c]}return a},{});w.forEach(function(a){b[a]=function(){return""}});var f=a.apply(this,[b,c,d]);for(var g in e){b[g]=e[g]}return f}.bind(this)}.bind(this)};A.prototype.addHelpers=function(a,b){this.currentThemeName=b;this.requiredStrings=[];this.requiredJS=[];a.uniqid=p++;a.str=this.addHelperFunction(this.stringHelper,a);a.cleanstr=this.addHelperFunction(this.cleanStringHelper,a);a.pix=this.addHelperFunction(this.pixHelper,a);a.js=this.addHelperFunction(this.jsHelper,a);a.quote=this.addHelperFunction(this.quoteHelper,a);a.shortentext=this.addHelperFunction(this.shortenTextHelper,a);a.userdate=this.addHelperFunction(this.userDateHelper,a);a.globals={config:g};a.currentTheme=b};A.prototype.getJS=function(){var a="";if(0<this.requiredJS.length){a=this.requiredJS.join(";\n")}return a};A.prototype.treatStringsInContent=function(b,c){var d=/\[\[_(s|c)\d+\]\]/,e,f,g,h,i,j,k;do{e="";f=b.search(d);while(-1<f){e+=b.substring(0,f);b=b.substr(f);k="c"==b[3];g="";h=4;i=b.substr(h,1);do{g+=i;h++;i=b.substr(h,1)}while("]"!=i);j=c[parseInt(g,10)];if("undefined"==typeof j){l.debug("Could not find string for pattern [[_"+(k?"c":"s")+g+"]].");j=""}if(k){j=a.escape(j)}e+=j;b=b.substr(6+g.length);f=b.search(d)}b=e+b;f=b.search(d)}while(-1<f);return b};A.prototype.treatDatesInContent=function(a,b){b.forEach(function(b,c){var d=new RegExp("\\[\\[_t_"+c+"\\]\\]","g");a=a.replace(d,b)});return a};A.prototype.doRender=function(c,e,f){this.currentThemeName=f;var g=t.getTemplateName(),h=new o("core/templates:doRender");return this.getTemplate(g).then(function(){this.addHelpers(e,f);var d=a.render(c,e,this.partialHelper.bind(this));return b.Deferred().resolve(d.trim(),this.getJS()).promise()}.bind(this)).then(function(a,c){if(0<this.requiredStrings.length){return d.get_strings(this.requiredStrings).then(function(d){this.requiredDates=this.requiredDates.map(function(a){return{timestamp:this.treatStringsInContent(a.timestamp,d),format:this.treatStringsInContent(a.format,d)}}.bind(this));a=this.treatStringsInContent(a,d);c=this.treatStringsInContent(c,d);return b.Deferred().resolve(a,c).promise()}.bind(this))}return b.Deferred().resolve(a,c).promise()}.bind(this)).then(function(a,c){if(0<this.requiredDates.length){return n.get(this.requiredDates).then(function(d){a=this.treatDatesInContent(a,d);c=this.treatDatesInContent(c,d);return b.Deferred().resolve(a,c).promise()}.bind(this))}return b.Deferred().resolve(a,c).promise()}.bind(this)).then(function(a,c){h.resolve();return b.Deferred().resolve(a,c).promise()})};var B=function(a){if(""!==a.trim()){var c=b("<script>").attr("type","text/javascript").html(a);b("head").append(c)}},C=function(a,c,d,e){var f=b(a);if(f.length){var g=b(c),h=null;if(e){h=new k.NodeList(f.children().get());h.destroy(!0);f.empty();f.append(g)}else{h=new k.NodeList(f.get());h.destroy(!0);f.replaceWith(g)}B(d);j.notifyFilterContentUpdated(g);return g.get()}return[]};A.prototype.scanForPartials=function(b){var c=a.parse(b),d=[],e=function(a,b){var c,d;for(c=0;c<a.length;c++){d=a[c];if(">"==d[0]||"<"==d[0]){b.push(d[1])}if(4<d.length){e(d[4],b)}}};e(c,d);return d};A.prototype.cachePartials=function(a,c){var d=this.currentThemeName+"/"+a;if(d in s){return s[d]}c=c||[d];s[d]=b.Deferred();this.getTemplate(a).then(function(e){var f=this.scanForPartials(e),g=f.filter(function(b){if(0<=c.indexOf(this.currentThemeName+"/"+b)){return!1}return b!=a}.bind(this)),h=g.map(function(a){c.push(this.currentThemeName+"/"+a);return this.cachePartials(a,c)}.bind(this));return b.when.apply(b,h).then(function(){return s[d].resolve(e)})}.bind(this)).catch(s[d].reject);return s[d]};A.prototype.render=function(a,c,d){if("undefined"==typeof d){d=g.theme}this.currentThemeName=d;var f=g.iconsystemmodule,h=b.Deferred();require([f],function(a){var b=new a;if(!(b instanceof i)){h.reject("Invalid icon system specified"+g.iconsystem)}else{t=b;b.init().then(h.resolve).catch(e.exception)}});return h.then(function(){return 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 //# sourceMappingURL=templates.min.js.map
diff --git a/lib/amd/build/templates.min.js.map b/lib/amd/build/templates.min.js.map
index 5ff5ca93c33..f583e39bed7 100644
--- a/lib/amd/build/templates.min.js.map
+++ b/lib/amd/build/templates.min.js.map
@@ -1 +1 @@
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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     * Quote helper used to wrap content in quotes, and escape all quotes 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 the \".\n        // This involves wrapping {{, and }} in change delimeter tags.\n        content = content\n            .replace(/\"/g, '\\\\\"')\n            .replace(/\\t/g, '&#9;')\n            .replace(/([{}]{2,3})/g, '{{=<% %>=}}$1<%={{ }}=%>')\n            .replace(/(\\r\\n|\\r|\\n)/g, '&#x0a;')\n            ;\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.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\\d+\\]\\]/,\n            treated,\n            index,\n            strIndex,\n            walker,\n            char,\n            strFinal;\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                strIndex = '';\n                walker = 4; // 4 is the length of '[[_s'.\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 [[_s' + strIndex + ']].');\n                    strFinal = '';\n                }\n                treated += strFinal;\n                content = content.substr(6 + strIndex.length); // 6 is the length of the placeholder without the index: '[[_s]]'.\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    };\n});\n"],"file":"templates.min.js"}
\ No newline at end of file
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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 quotes 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 the \".\n        // This involves wrapping {{, and }} in change delimeter tags.\n        content = content\n            .replace(/\"/g, '\\\\\"')\n            .replace(/\\t/g, '&#9;')\n            .replace(/([{}]{2,3})/g, '{{=<% %>=}}$1<%={{ }}=%>')\n            .replace(/(\\r\\n|\\r|\\n)/g, '&#x0a;')\n            ;\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    };\n});\n"],"file":"templates.min.js"}
\ No newline at end of file
diff --git a/lib/amd/src/templates.js b/lib/amd/src/templates.js
index de75eb910c4..fd65c2410d4 100644
--- a/lib/amd/src/templates.js
+++ b/lib/amd/src/templates.js
@@ -572,6 +572,25 @@ function(
         return '[[_s' + index + ']]';
     };
 
+    /**
+     * String helper to render {{#cleanstr}}abd component { a : 'fish'}{{/cleanstr}}
+     * into a get_string following by an HTML escape.
+     *
+     * @method cleanStringHelper
+     * @private
+     * @param {object} context The current mustache context.
+     * @param {string} sectionText The text to parse the arguments from.
+     * @param {function} helper Used to render subsections of the text.
+     * @return {string}
+     */
+    Renderer.prototype.cleanStringHelper = function(context, sectionText, helper) {
+        var str = this.stringHelper(context, sectionText, helper);
+
+        // We're going to use [[_cx]] format for clean strings, where x is a number.
+        // Hence, replacing 's' with 'c' in the placeholder that stringHelper returns.
+        return str.replace('s', 'c');
+    };
+
     /**
      * Quote helper used to wrap content in quotes, and escape all quotes present in the content.
      *
@@ -718,6 +737,7 @@ function(
         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);
@@ -761,13 +781,14 @@ function(
      * @return {String} The treated content.
      */
     Renderer.prototype.treatStringsInContent = function(content, strings) {
-        var pattern = /\[\[_s\d+\]\]/,
+        var pattern = /\[\[_(s|c)\d+\]\]/,
             treated,
             index,
             strIndex,
             walker,
             char,
-            strFinal;
+            strFinal,
+            isClean;
 
         do {
             treated = '';
@@ -777,8 +798,9 @@ function(
                 // Copy the part prior to the placeholder to the treated string.
                 treated += content.substring(0, index);
                 content = content.substr(index);
+                isClean = content[3] == 'c';
                 strIndex = '';
-                walker = 4; // 4 is the length of '[[_s'.
+                walker = 4; // 4 is the length of either '[[_s' or '[[_c'.
 
                 // Walk the characters to manually extract the index of the string from the placeholder.
                 char = content.substr(walker, 1);
@@ -791,11 +813,15 @@ function(
                 // Get the string, add it to the treated result, and remove the placeholder from the content to treat.
                 strFinal = strings[parseInt(strIndex, 10)];
                 if (typeof strFinal === 'undefined') {
-                    Log.debug('Could not find string for pattern [[_s' + strIndex + ']].');
+                    Log.debug('Could not find string for pattern [[_' + (isClean ? 'c' : 's') + strIndex + ']].');
                     strFinal = '';
                 }
+                if (isClean) {
+                    strFinal = mustache.escape(strFinal);
+                }
                 treated += strFinal;
-                content = content.substr(6 + strIndex.length); // 6 is the length of the placeholder without the index: '[[_s]]'.
+                content = content.substr(6 + strIndex.length); // 6 is the length of the placeholder without the index.
+                                                               // That's either '[[_s]]' or '[[_c]]'.
 
                 // Find the next placeholder.
                 index = content.search(pattern);
diff --git a/lib/classes/output/mustache_clean_string_helper.php b/lib/classes/output/mustache_clean_string_helper.php
new file mode 100644
index 00000000000..0e56f4ce267
--- /dev/null
+++ b/lib/classes/output/mustache_clean_string_helper.php
@@ -0,0 +1,68 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Mustache helper to load strings from string_manager and perform HTML escaping on them.
+ *
+ * @package    core
+ * @category   output
+ * @copyright  2021 Shamim Rezaie <shamim@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace core\output;
+
+use Mustache_LambdaHelper;
+
+/**
+ * This class will load language strings in a template.
+ *
+ * @copyright  2021 Shamim Rezaie <shamim@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @since      4.0
+ */
+class mustache_clean_string_helper {
+
+    /** @var mustache_string_helper A string helper instance that is being used internally for fetching strings */
+    private $stringhelper;
+
+    /**
+     * Create new instance of mustache clean string helper.
+     */
+    public function __construct() {
+        $this->stringhelper = new \core\output\mustache_string_helper();
+    }
+
+    /**
+     * Read a lang string from a template and get it from get_string.
+     *
+     * Some examples for calling this from a template are:
+     *
+     * {{#cleanstr}}activity{{/cleanstr}}
+     * {{#cleanstr}}actionchoice, core, {{#str}}delete{{/str}}{{/cleanstr}} (Together with the str helper)
+     * {{#cleanstr}}addinganewto, core, {"what":"This", "to":"That"}{{/cleanstr}} (Complex $a)
+     *
+     * The args are comma separated and only the first is required.
+     * The last is a $a argument for get string. For complex data here, use JSON.
+     *
+     * @param string $text The text to parse for arguments.
+     * @param Mustache_LambdaHelper $helper Used to render nested mustache variables.
+     * @return string
+     */
+    public function cleanstr($text, Mustache_LambdaHelper $helper) {
+        return s($this->stringhelper->str($text, $helper));
+    }
+}
diff --git a/lib/outputrenderers.php b/lib/outputrenderers.php
index c7cb55def8f..95ec0248bac 100644
--- a/lib/outputrenderers.php
+++ b/lib/outputrenderers.php
@@ -105,6 +105,7 @@ class renderer_base {
 
             $loader = new \core\output\mustache_filesystem_loader();
             $stringhelper = new \core\output\mustache_string_helper();
+            $cleanstringhelper = new \core\output\mustache_clean_string_helper();
             $quotehelper = new \core\output\mustache_quote_helper();
             $jshelper = new \core\output\mustache_javascript_helper($this->page);
             $pixhelper = new \core\output\mustache_pix_helper($this);
@@ -116,6 +117,7 @@ class renderer_base {
 
             $helpers = array('config' => $safeconfig,
                              'str' => array($stringhelper, 'str'),
+                             'cleanstr' => array($cleanstringhelper, 'cleanstr'),
                              'quote' => array($quotehelper, 'quote'),
                              'js' => array($jshelper, 'help'),
                              'pix' => array($pixhelper, 'pix'),
diff --git a/lib/tests/output/mustache_clean_string_helper_test.php b/lib/tests/output/mustache_clean_string_helper_test.php
new file mode 100644
index 00000000000..a8eedb83214
--- /dev/null
+++ b/lib/tests/output/mustache_clean_string_helper_test.php
@@ -0,0 +1,56 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+declare(strict_types=1);
+
+namespace core\output;
+
+/**
+ * Unit tests for the mustache_clean_string_helper class.
+ *
+ * @package   core
+ * @category  test
+ * @copyright 2021 Shamim Rezaie <shamim@moodle.com>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @coversDefaultClass mustache_clean_string_helper
+ */
+class mustache_clean_string_helper_test extends \basic_testcase {
+
+    /**
+     * Test the get_lang_menu
+     *
+     * @covers ::cleanstr
+     */
+    function test_cleanstr() {
+        $engine = new \Mustache_Engine();
+        $context = new \Mustache_Context();
+        $lambdahelper = new \Mustache_LambdaHelper($engine, $context);
+
+        $cleanstringhelper = new mustache_clean_string_helper();
+
+        // Simple string.
+        $this->assertEquals('Log in', $cleanstringhelper->cleanstr('login, core', $lambdahelper));
+
+        // Quotes in string.
+        $this->assertEquals('Today&#039;s logs', $cleanstringhelper->cleanstr('todaylogs, core', $lambdahelper));
+
+        // Quotes in string with parameter.
+        $this->assertEquals('After &quot;test&quot;', $cleanstringhelper->cleanstr('movecontentafter, core, test', $lambdahelper));
+
+        // Quotes in parameter.
+        $this->assertEquals('Add a new &quot;&#039;&amp;', $cleanstringhelper->cleanstr('addnew, core, "\'&', $lambdahelper));
+    }
+}
diff --git a/lib/upgrade.txt b/lib/upgrade.txt
index 419c2a20cbd..50e79da16c5 100644
--- a/lib/upgrade.txt
+++ b/lib/upgrade.txt
@@ -116,6 +116,7 @@ completely removed from Moodle core too.
 * Final deprecation: The following functions along with associated tests have been removed:
   - core_grades_external::get_grades
   - core_grades_external::get_grade_item
+* Added the cleanstr mustache template helper to clean strings after loading them from language packs.
 
 === 3.11.4 ===
 * A new option dontforcesvgdownload has been added to the $options parameter of the send_file() function.

From 652392d932551b4eb88efd74be3c73d51b70bf7b Mon Sep 17 00:00:00 2001
From: Shamim Rezaie <shamim@moodle.com>
Date: Mon, 9 Aug 2021 21:40:20 +1000
Subject: [PATCH 2/3] MDL-70721 output: remove {{#quote}} wherever it was
 misused

Also use the new {{#cleanstr}} helper where it was more appropriate
than the {{#str} helper.
---
 .../setting_configcolourpicker.mustache       |  2 +-
 .../policy/templates/page_agreedocs.mustache  |  4 ++--
 .../templates/event-list-item.mustache        |  4 ++--
 enrol/fee/templates/payment_region.mustache   |  2 +-
 enrol/lti/templates/copy_grid.mustache        |  2 +-
 .../history/templates/user_button.mustache    |  4 ++--
 .../singleview/templates/button.mustache      |  2 +-
 grade/templates/edit_tree.mustache            |  2 +-
 lib/templates/action_menu_link.mustache       |  2 +-
 lib/templates/block.mustache                  |  2 +-
 lib/templates/chooser.mustache                |  4 ++--
 lib/templates/copy_box.mustache               |  2 +-
 lib/templates/loginform.mustache              |  6 ++---
 lib/templates/modal.mustache                  |  2 +-
 lib/templates/single_button.mustache          |  4 ++--
 message/templates/message_drawer.mustache     |  2 +-
 ...onversation_body_confirm_dialogue.mustache | 24 +++++++++----------
 .../templates/bulk_action_button.mustache     |  4 ++--
 18 files changed, 37 insertions(+), 37 deletions(-)

diff --git a/admin/templates/setting_configcolourpicker.mustache b/admin/templates/setting_configcolourpicker.mustache
index 50b7da1011b..7b52846f9b4 100644
--- a/admin/templates/setting_configcolourpicker.mustache
+++ b/admin/templates/setting_configcolourpicker.mustache
@@ -48,6 +48,6 @@
     </div>
     <input type="text" name="{{name}}" id="{{id}}" value="{{value}}" size="12" class="form-control text-ltr" {{#readonly}}disabled{{/readonly}}>
     {{#haspreviewconfig}}
-        <input type="button" id="{{id}}_preview" value={{#quote}}{{#str}}preview{{/str}}{{/quote}} class="admin_colourpicker_preview">
+        <input type="button" id="{{id}}_preview" value="{{#cleanstr}}preview{{/cleanstr}}" class="admin_colourpicker_preview">
     {{/haspreviewconfig}}
 </div>
diff --git a/admin/tool/policy/templates/page_agreedocs.mustache b/admin/tool/policy/templates/page_agreedocs.mustache
index 60efaa6838e..046eb8338ad 100644
--- a/admin/tool/policy/templates/page_agreedocs.mustache
+++ b/admin/tool/policy/templates/page_agreedocs.mustache
@@ -134,9 +134,9 @@
 {{# str }}somefieldsrequired, form, <i class="icon fa fa-exclamation-circle text-danger fa-fw" title="{{# str }} required {{/ str }}" ></i>{{/ str }}
 <hr>
 
-<input type="submit" class="btn btn-primary" name="submit" value={{#quote}}{{#str}} next {{/str}}{{/quote}}>
+<input type="submit" class="btn btn-primary" name="submit" value="{{#cleanstr}} next {{/cleanstr}}">
 {{#cancancel}}
-<input type="submit" class="btn btn-secondary" name="cancel" value={{#quote}}{{#str}} cancel {{/str}}{{/quote}}>
+<input type="submit" class="btn btn-secondary" name="cancel" value="{{#cleanstr}} cancel {{/cleanstr}}">
 {{/cancancel}}
 </form>
 
diff --git a/blocks/timeline/templates/event-list-item.mustache b/blocks/timeline/templates/event-list-item.mustache
index ad1365bff8a..4d60eaa830d 100644
--- a/blocks/timeline/templates/event-list-item.mustache
+++ b/blocks/timeline/templates/event-list-item.mustache
@@ -57,8 +57,8 @@
         <div class="event-name-container flex-grow-1 text-truncate line-height-3">
             <h6 class="event-name text-truncate mb-0">
                 <a href="{{url}}"
-                        title={{#quote}}{{{name}}}{{/quote}}
-                        aria-label='{{#str}} ariaeventlistitem, block_timeline, { "name": {{#quote}}{{{activityname}}}{{/quote}}, "course": {{#quote}}{{{course.fullnamedisplay}}}{{/quote}}, "date": "{{#userdate}} {{timesort}}, {{#str}} strftimedatetime, core_langconfig {{/str}} {{/userdate}}" } {{/str}}'>
+                        title="{{name}}"
+                        aria-label='{{#cleanstr}} ariaeventlistitem, block_timeline, { "name": {{#quote}}{{{activityname}}}{{/quote}}, "course": {{#quote}}{{{course.fullnamedisplay}}}{{/quote}}, "date": "{{#userdate}} {{timesort}}, {{#str}} strftimedatetime, core_langconfig {{/str}} {{/userdate}}" } {{/cleanstr}}'>
                     {{{activityname}}}</a>
                 {{#overdue}}<span class="badge badge-pill badge-danger ml-1">{{#str}} overdue, block_timeline {{/str}}</span>{{/overdue}}
             </h6>
diff --git a/enrol/fee/templates/payment_region.mustache b/enrol/fee/templates/payment_region.mustache
index 71235543648..a1bbdc5cbac 100644
--- a/enrol/fee/templates/payment_region.mustache
+++ b/enrol/fee/templates/payment_region.mustache
@@ -67,7 +67,7 @@
             data-itemid="{{instanceid}}"
             data-cost="{{cost}}"
             data-successurl="{{successurl}}"
-            data-description={{# quote }}{{description}}{{/ quote }}
+            data-description="{{description}}"
         >
             {{# str }} sendpaymentbutton, enrol_fee {{/ str }}
         </button>
diff --git a/enrol/lti/templates/copy_grid.mustache b/enrol/lti/templates/copy_grid.mustache
index fee6faf8e6d..1adb662664f 100644
--- a/enrol/lti/templates/copy_grid.mustache
+++ b/enrol/lti/templates/copy_grid.mustache
@@ -49,7 +49,7 @@
 {{#rows}}
     <div>
         <label style="display: inline-block; width: 5em"
-            {{#id}}for={{#quote}}{{{id}}}-{{{uniqid}}}{{/quote}}{{/id}} {{#hidelabel}}
+            {{#id}}for="{{id}}-{{uniqid}}"{{/id}} {{#hidelabel}}
                class="accesshide"{{/hidelabel}}>{{label}}</label>
         <div style="display: inline-block">{{> core/copy_box }}</div>
     </div>
diff --git a/grade/report/history/templates/user_button.mustache b/grade/report/history/templates/user_button.mustache
index 15cd1303c18..1c881e07787 100644
--- a/grade/report/history/templates/user_button.mustache
+++ b/grade/report/history/templates/user_button.mustache
@@ -47,8 +47,8 @@
         {{/params}}
         <input type="button" class="btn btn-secondary selectortrigger"
             id="{{id}}"
-            title={{#quote}}{{tooltip}}{{/quote}}
-            value={{#quote}}{{label}}{{/quote}}
+            title="{{tooltip}}"
+            value="{{label}}"
             {{#disabled}}disabled{{/disabled}}>
     </div>
 </div>
diff --git a/grade/report/singleview/templates/button.mustache b/grade/report/singleview/templates/button.mustache
index 5d43733af4f..52de296e38b 100644
--- a/grade/report/singleview/templates/button.mustache
+++ b/grade/report/singleview/templates/button.mustache
@@ -25,4 +25,4 @@
         "value": "Save"
     }
 }}
-<input type="{{type}}" value={{#quote}}{{value}}{{/quote}} class="btn btn-secondary">
+<input type="{{type}}" value="{{value}}" class="btn btn-secondary">
diff --git a/grade/templates/edit_tree.mustache b/grade/templates/edit_tree.mustache
index eb678f87a86..e9317ce42de 100644
--- a/grade/templates/edit_tree.mustache
+++ b/grade/templates/edit_tree.mustache
@@ -51,7 +51,7 @@
         {{{table}}}
         <div id="gradetreesubmit">
             {{#showsave}}
-                <input class="advanced btn btn-primary" type="submit" value={{#quote}}{{#str}}savechanges{{/str}}{{/quote}}>
+                <input class="advanced btn btn-primary" type="submit" value="{{#cleanstr}}savechanges{{/cleanstr}}">
             {{/showsave}}
             {{#showbulkmove}}
                 <div class="form-inline mt-3">
diff --git a/lib/templates/action_menu_link.mustache b/lib/templates/action_menu_link.mustache
index a57beb2e0fb..55143816d2a 100644
--- a/lib/templates/action_menu_link.mustache
+++ b/lib/templates/action_menu_link.mustache
@@ -27,7 +27,7 @@
     }
 }}
 {{^disabled}}
-    <a href="{{url}}" class="{{$actionmenulinkclasses}}aabtn {{classes}}{{/actionmenulinkclasses}}" {{#attributes}}{{name}}={{#quote}}{{value}}{{/quote}} {{/attributes}}{{#showtext}}aria-labelledby="actionmenuaction-{{instance}}"{{/showtext}}>
+    <a href="{{url}}" class="{{$actionmenulinkclasses}}aabtn {{classes}}{{/actionmenulinkclasses}}" {{#attributes}}{{name}}="{{value}}" {{/attributes}}{{#showtext}}aria-labelledby="actionmenuaction-{{instance}}"{{/showtext}}>
         {{#icon}}
             {{#pix}}{{key}}, {{component}}, {{title}}{{/pix}}
         {{/icon}}
diff --git a/lib/templates/block.mustache b/lib/templates/block.mustache
index 7fc87189de4..aa3b0ac60be 100644
--- a/lib/templates/block.mustache
+++ b/lib/templates/block.mustache
@@ -26,7 +26,7 @@
      data-block="{{type}}"
      data-instance-id="{{blockinstanceid}}"
      {{#arialabel}}
-        aria-label={{#quote}}{{{arialabel}}}{{/quote}}
+        aria-label="{{arialabel}}"
      {{/arialabel}}
      {{^arialabel}}
         {{#title}}
diff --git a/lib/templates/chooser.mustache b/lib/templates/chooser.mustache
index c774d3ef656..0cbbfffe81c 100644
--- a/lib/templates/chooser.mustache
+++ b/lib/templates/chooser.mustache
@@ -68,8 +68,8 @@
                 </div>
 
                 <div class="submitbuttons">
-                    <input type="submit" name="submitbutton" class="submitbutton btn btn-primary" value={{#quote}}{{#str}}add{{/str}}{{/quote}}>
-                    <input type="submit" name="addcancel" class="addcancel btn btn-secondary" value={{#quote}}{{#str}}cancel{{/str}}{{/quote}}>
+                    <input type="submit" name="submitbutton" class="submitbutton btn btn-primary" value="{{#cleanstr}}add{{/cleanstr}}">
+                    <input type="submit" name="addcancel" class="addcancel btn btn-secondary" value="{{#cleanstr}}cancel{{/cleanstr}}">
                 </div>
 
             </form>
diff --git a/lib/templates/copy_box.mustache b/lib/templates/copy_box.mustache
index df793434be6..0c8d631be16 100644
--- a/lib/templates/copy_box.mustache
+++ b/lib/templates/copy_box.mustache
@@ -31,7 +31,7 @@
     Example context (json):
     { "text": "Copyable text"}
 }}
-<input type="text" class="copy_box" value="{{{ text }}}" readonly="readonly" size="48" {{#id}}id={{#quote}}{{{id}}}-{{{uniqid}}}{{/quote}}{{/id}}/>
+<input type="text" class="copy_box" value="{{{ text }}}" readonly="readonly" size="48" {{#id}}id="{{id}}-{{uniqid}}"{{/id}}/>
 {{# js }}
 require(['jquery'], function($) {
     $('.copy_box').on('click', function() {
diff --git a/lib/templates/loginform.mustache b/lib/templates/loginform.mustache
index 1c969f5bd13..dc9f03e16b8 100644
--- a/lib/templates/loginform.mustache
+++ b/lib/templates/loginform.mustache
@@ -137,15 +137,15 @@
             <input type="text" name="username" id="username" {{!
                 !}}class="form-control" {{!
                 !}}value="{{username}}" {{!
-                !}}placeholder={{#quote}}{{^canloginbyemail}}{{#str}}username{{/str}}{{/canloginbyemail}}{{!
-                !}}{{#canloginbyemail}}{{#str}}usernameemail{{/str}}{{/canloginbyemail}}{{/quote}} {{!
+                !}}placeholder="{{^canloginbyemail}}{{#cleanstr}}username{{/cleanstr}}{{/canloginbyemail}}{{!
+                !}}{{#canloginbyemail}}{{#cleanstr}}usernameemail{{/cleanstr}}{{/canloginbyemail}}" {{!
                 !}}autocomplete="username">
         </div>
         <div class="login-form-password form-group">
             <label for="password" class="sr-only">{{#str}} password {{/str}}</label>
             <input type="password" name="password" id="password" value="" {{!
                 !}}class="form-control" {{!
-                !}}placeholder={{#quote}}{{#str}}password{{/str}}{{/quote}} {{!
+                !}}placeholder="{{#cleanstr}}password{{/cleanstr}}" {{!
                 !}}autocomplete="current-password">
         </div>
         {{#rememberusername}}
diff --git a/lib/templates/modal.mustache b/lib/templates/modal.mustache
index 473821cf09e..8cf231cf616 100644
--- a/lib/templates/modal.mustache
+++ b/lib/templates/modal.mustache
@@ -48,7 +48,7 @@
                 {{$header}}
                     <h5 id="{{uniqid}}-modal-title" class="modal-title" data-region="title">{{$title}}{{title}}{{/title}}</h5>
                 {{/header}}
-                <button type="button" class="close" data-action="hide" aria-label={{#quote}}{{#str}}closebuttontitle{{/str}}{{/quote}}>
+                <button type="button" class="close" data-action="hide" aria-label="{{#cleanstr}}closebuttontitle{{/cleanstr}}">
                   <span aria-hidden="true">&times;</span>
                 </button>
             </div>
diff --git a/lib/templates/single_button.mustache b/lib/templates/single_button.mustache
index c15af6c5a41..a10f9bc1505 100644
--- a/lib/templates/single_button.mustache
+++ b/lib/templates/single_button.mustache
@@ -58,9 +58,9 @@
         {{/params}}
         <button type="submit" class="btn {{#primary}}btn-primary{{/primary}}{{^primary}}btn-secondary{{/primary}}"
             id="{{id}}"
-            title={{#quote}}{{tooltip}}{{/quote}}
+            title="{{tooltip}}"
             {{#disabled}}disabled{{/disabled}}
-            {{#attributes}} {{name}}={{#quote}}{{value}}{{/quote}} {{/attributes}}>{{label}}</button>
+            {{#attributes}} {{name}}="{{value}}" {{/attributes}}>{{label}}</button>
     </form>
 </div>
 {{#hasactions}}
diff --git a/message/templates/message_drawer.mustache b/message/templates/message_drawer.mustache
index c3440ba08f0..6cf1738369b 100644
--- a/message/templates/message_drawer.mustache
+++ b/message/templates/message_drawer.mustache
@@ -38,7 +38,7 @@
         <div id="message-drawer-{{uniqid}}" class="message-app" data-region="message-drawer" role="region">
             <div class="closewidget text-right pr-2">
                 <a class="text-dark btn-link" data-action="closedrawer" href="#"
-                   title="{{#str}} closebuttontitle {{/str}}" aria-label="{{#str}} closebuttontitle {{/str}}"
+                   title="{{#cleanstr}} closebuttontitle {{/cleanstr}}" aria-label="{{#cleanstr}} closebuttontitle {{/cleanstr}}"
                 >
                     {{#pix}} i/window_close, core {{/pix}}
                 </a>
diff --git a/message/templates/message_drawer_view_conversation_body_confirm_dialogue.mustache b/message/templates/message_drawer_view_conversation_body_confirm_dialogue.mustache
index f591b5ea709..166e38a90fb 100644
--- a/message/templates/message_drawer_view_conversation_body_confirm_dialogue.mustache
+++ b/message/templates/message_drawer_view_conversation_body_confirm_dialogue.mustache
@@ -40,45 +40,45 @@
     <div class="mb-2 custom-control custom-checkbox hidden" data-region="delete-messages-for-all-users-toggle-container">
         <input type="checkbox" class="custom-control-input" id="delete-messages-for-all-users" data-region="delete-messages-for-all-users-toggle">
         <label class="custom-control-label text-muted" for="delete-messages-for-all-users">
-            {{#str}} deleteforeveryone, core_message {{/str}}
+            {{#cleanstr}} deleteforeveryone, core_message {{/cleanstr}}
         </label>
     </div>
     <button type="button" class="btn btn-primary btn-block hidden" data-action="confirm-block">
-        <span data-region="dialogue-button-text">{{#str}} blockuserconfirmbutton, core_message {{/str}}</span>
+        <span data-region="dialogue-button-text">{{#cleanstr}} blockuserconfirmbutton, core_message {{/cleanstr}}</span>
         <span class="hidden" data-region="loading-icon-container">{{> core/loading }}</span>
     </button>
     <button type="button" class="btn btn-primary btn-block hidden" data-action="confirm-unblock">
-        <span data-region="dialogue-button-text">{{#str}} unblock, core_message {{/str}}</span>
+        <span data-region="dialogue-button-text">{{#cleanstr}} unblock, core_message {{/cleanstr}}</span>
         <span class="hidden" data-region="loading-icon-container">{{> core/loading }}</span>
     </button>
     <button type="button" class="btn btn-primary btn-block hidden" data-action="confirm-remove-contact">
-        <span data-region="dialogue-button-text">{{#str}} remove, core {{/str}}</span>
+        <span data-region="dialogue-button-text">{{#cleanstr}} remove, core {{/cleanstr}}</span>
         <span class="hidden" data-region="loading-icon-container">{{> core/loading }}</span>
     </button>
     <button type="button" class="btn btn-primary btn-block hidden" data-action="confirm-add-contact">
-        <span data-region="dialogue-button-text">{{#str}} add, core {{/str}}</span>
+        <span data-region="dialogue-button-text">{{#cleanstr}} add, core {{/cleanstr}}</span>
         <span class="hidden" data-region="loading-icon-container">{{> core/loading }}</span>
     </button>
     <button type="button" class="btn btn-primary btn-block hidden" data-action="confirm-delete-selected-messages">
-        <span data-region="dialogue-button-text">{{#str}} delete, core {{/str}}</span>
+        <span data-region="dialogue-button-text">{{#cleanstr}} delete, core {{/cleanstr}}</span>
         <span class="hidden" data-region="loading-icon-container">{{> core/loading }}</span>
     </button>
     <button type="button" class="btn btn-primary btn-block hidden" data-action="confirm-delete-conversation">
-        <span data-region="dialogue-button-text">{{#str}} delete, core {{/str}}</span>
+        <span data-region="dialogue-button-text">{{#cleanstr}} delete, core {{/cleanstr}}</span>
         <span class="hidden" data-region="loading-icon-container">{{> core/loading }}</span>
     </button>
     <button type="button" class="btn btn-primary btn-block hidden" data-action="request-add-contact">
-        <span data-region="dialogue-button-text">{{#str}} sendcontactrequest, core_message {{/str}}</span>
+        <span data-region="dialogue-button-text">{{#cleanstr}} sendcontactrequest, core_message {{/cleanstr}}</span>
         <span class="hidden" data-region="loading-icon-container">{{> core/loading }}</span>
     </button>
     <button type="button" class="btn btn-primary btn-block hidden" data-action="accept-contact-request">
-        <span data-region="dialogue-button-text">{{#str}} acceptandaddcontact, core_message {{/str}}</span>
+        <span data-region="dialogue-button-text">{{#cleanstr}} acceptandaddcontact, core_message {{/cleanstr}}</span>
         <span class="hidden" data-region="loading-icon-container">{{> core/loading }}</span>
     </button>
     <button type="button" class="btn btn-secondary btn-block hidden" data-action="decline-contact-request">
-        <span data-region="dialogue-button-text">{{#str}} decline, core_message {{/str}}</span>
+        <span data-region="dialogue-button-text">{{#cleanstr}} decline, core_message {{/cleanstr}}</span>
         <span class="hidden" data-region="loading-icon-container">{{> core/loading }}</span>
     </button>
-    <button type="button" class="btn btn-primary btn-block" data-action="okay-confirm">{{#str}} ok, core {{/str}}</button>
-    <button type="button" class="btn btn-secondary btn-block" data-action="cancel-confirm">{{#str}} cancel, core {{/str}}</button>
+    <button type="button" class="btn btn-primary btn-block" data-action="okay-confirm">{{#cleanstr}} ok, core {{/cleanstr}}</button>
+    <button type="button" class="btn btn-secondary btn-block" data-action="cancel-confirm">{{#cleanstr}} cancel, core {{/cleanstr}}</button>
 </div>
diff --git a/report/insights/templates/bulk_action_button.mustache b/report/insights/templates/bulk_action_button.mustache
index 8f1d307e392..1229845f18e 100644
--- a/report/insights/templates/bulk_action_button.mustache
+++ b/report/insights/templates/bulk_action_button.mustache
@@ -55,7 +55,7 @@
     {{/params}}
     <button type="submit" class="btn {{#primary}}btn-primary{{/primary}}{{^primary}}btn-outline-primary{{/primary}}"
         id="{{id}}"
-        title={{#quote}}{{tooltip}}{{/quote}}
+        title="{{tooltip}}"
         {{#disabled}}disabled{{/disabled}}
-        {{#attributes}} {{name}}={{#quote}}{{value}}{{/quote}} {{/attributes}}>{{{label}}}</button>
+        {{#attributes}} {{name}}="{{value}}" {{/attributes}}>{{{label}}}</button>
 </div>

From 7ba7920aa83c930e8ab6d3c8675329d58dd16418 Mon Sep 17 00:00:00 2001
From: Shamim Rezaie <shamim@moodle.com>
Date: Wed, 11 Aug 2021 15:38:11 +1000
Subject: [PATCH 3/3] MDL-70721 output: Remove redundant title

The format_string() function does half html escaping. It escapes < and >
characters, but does not escape ". Therefore, it put us in a situation
where neither {{}}, nor {{{}}} are suitable in templates. If we use {{}}
for an attribute (like title or aria-label), then < and > characters
will be double escaped. On the other hand, if we use {{{}}} there, a
double quote character will break HTML when it is used in an attribute.
Therefore, neither {{}}, nore {{{}}} are usable in html attributes.

Moreover, The title attribute here was redundant because it had the same
value as the link's text.
---
 course/classes/output/activity_navigation.php | 2 --
 lib/templates/action_link.mustache            | 4 ++--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/course/classes/output/activity_navigation.php b/course/classes/output/activity_navigation.php
index 84461428b6d..7412eaebbfa 100644
--- a/course/classes/output/activity_navigation.php
+++ b/course/classes/output/activity_navigation.php
@@ -74,7 +74,6 @@ class activity_navigation implements renderable, templatable {
             $attributes = [
                 'class' => 'btn btn-link',
                 'id' => 'prev-activity-link',
-                'title' => $linkname,
             ];
             $this->prevlink = new \action_link($linkurl, $OUTPUT->larrow() . ' ' . $linkname, null, $attributes);
         }
@@ -90,7 +89,6 @@ class activity_navigation implements renderable, templatable {
             $attributes = [
                 'class' => 'btn btn-link',
                 'id' => 'next-activity-link',
-                'title' => $linkname,
             ];
             $this->nextlink = new \action_link($linkurl, $linkname . ' ' . $OUTPUT->rarrow(), null, $attributes);
         }
diff --git a/lib/templates/action_link.mustache b/lib/templates/action_link.mustache
index 0616c6345cb..fde8f5b52dc 100644
--- a/lib/templates/action_link.mustache
+++ b/lib/templates/action_link.mustache
@@ -52,11 +52,11 @@
     }
 }}
 {{^disabled}}
-    <a href="{{{url}}}" id="{{id}}" class="{{classes}}" {{#attributes}} {{name}}={{#quote}}{{value}}{{/quote}} {{/attributes}}>{{#icon}}{{#pix}}{{key}}, {{component}}, {{title}}{{/pix}}{{/icon}}{{{text}}}</a>
+    <a href="{{{url}}}" id="{{id}}" class="{{classes}}" {{#attributes}} {{name}}="{{value}}" {{/attributes}}>{{#icon}}{{#pix}}{{key}}, {{component}}, {{title}}{{/pix}}{{/icon}}{{{text}}}</a>
     {{#hasactions}}
         {{> core/actions }}
     {{/hasactions}}
 {{/disabled}}
 {{#disabled}}
-    <span class="currentlink {{classes}}" {{#attributes}} {{name}}={{#quote}}{{value}}{{/quote}} {{/attributes}}>{{#icon}}{{#pix}}{{key}}, {{component}}, {{title}}{{/pix}}{{/icon}}{{{text}}}</span>
+    <span class="currentlink {{classes}}" {{#attributes}} {{name}}="{{value}}" {{/attributes}}>{{#icon}}{{#pix}}{{key}}, {{component}}, {{title}}{{/pix}}{{/icon}}{{text}}</span>
 {{/disabled}}