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