The source code

    /**
     * @class Ext.XTemplate
     * @extends Ext.Template
     * <p>A template class that supports advanced functionality like:<div class="mdetail-params"><ul>
     * <li>Autofilling arrays using templates and sub-templates</li>
     * <li>Conditional processing with basic comparison operators</li>
     * <li>Basic math function support</li>
     * <li>Execute arbitrary inline code with special built-in template variables</li>
     * <li>Custom member functions</li>
     * <li>Many special tags and built-in operators that aren't defined as part of
     * the API, but are supported in the templates that can be created</li>
     * </ul></div></p>
     * <p>XTemplate provides the templating mechanism built into:<div class="mdetail-params"><ul>
     * <li>{@link Ext.DataView}</li>
     * <li>{@link Ext.ListView}</li>
     * <li>{@link Ext.form.ComboBox}</li>
     * <li>{@link Ext.grid.TemplateColumn}</li>
     * <li>{@link Ext.grid.GroupingView}</li>
     * <li>{@link Ext.menu.Item}</li>
     * <li>{@link Ext.layout.MenuLayout}</li>
     * <li>{@link Ext.ColorPalette}</li>
     * </ul></div></p>
     *
     * <p>For example usage {@link #XTemplate see the constructor}.</p>
     *
     * @constructor
     * The {@link Ext.Template#Template Ext.Template constructor} describes
     * the acceptable parameters to pass to the constructor. The following
     * examples demonstrate all of the supported features.</p>
     *
     * <div class="mdetail-params"><ul>
     *
     * <li><b><u>Sample Data</u></b>
     * <div class="sub-desc">
     * <p>This is the data object used for reference in each code example:</p>
     * <pre><code>
    var data = {
        name: 'Jack Slocum',
        title: 'Lead Developer',
        company: 'Ext JS, LLC',
        email: 'jack@extjs.com',
        address: '4 Red Bulls Drive',
        city: 'Cleveland',
        state: 'Ohio',
        zip: '44102',
        drinks: ['Red Bull', 'Coffee', 'Water'],
        kids: [{
            name: 'Sara Grace',
            age:3
        },{
            name: 'Zachary',
            age:2
        },{
            name: 'John James',
            age:0
        }]
    };
     * </code></pre>
     * </div>
     * </li>
     *
     *
     * <li><b><u>Auto filling of arrays</u></b>
     * <div class="sub-desc">
     * <p>The <b><tt>tpl</tt></b> tag and the <b><tt>for</tt></b> operator are used
     * to process the provided data object:
     * <ul>
     * <li>If the value specified in <tt>for</tt> is an array, it will auto-fill,
     * repeating the template block inside the <tt>tpl</tt> tag for each item in the
     * array.</li>
     * <li>If <tt>for="."</tt> is specified, the data object provided is examined.</li>
     * <li>While processing an array, the special variable <tt>{#}</tt>
     * will provide the current array index + 1 (starts at 1, not 0).</li>
     * </ul>
     * </p>
     * <pre><code>
    &lt;tpl <b>for</b>=".">...&lt;/tpl>       // loop through array at root node
    &lt;tpl <b>for</b>="foo">...&lt;/tpl>     // loop through array at foo node
    &lt;tpl <b>for</b>="foo.bar">...&lt;/tpl> // loop through array at foo.bar node
     * </code></pre>
     * Using the sample data above:
     * <pre><code>
    var tpl = new Ext.XTemplate(
        '&lt;p>Kids: ',
        '&lt;tpl <b>for</b>=".">',       // process the data.kids node
            '&lt;p>{#}. {name}&lt;/p>',  // use current array index to autonumber
        '&lt;/tpl>&lt;/p>'
    );
    tpl.overwrite(panel.body, data.kids); // pass the kids property of the data object
     * </code></pre>
     * <p>An example illustrating how the <b><tt>for</tt></b> property can be leveraged
     * to access specified members of the provided data object to populate the template:</p>
     * <pre><code>
    var tpl = new Ext.XTemplate(
        '&lt;p>Name: {name}&lt;/p>',
        '&lt;p>Title: {title}&lt;/p>',
        '&lt;p>Company: {company}&lt;/p>',
        '&lt;p>Kids: ',
        '&lt;tpl <b>for="kids"</b>>',     // interrogate the kids property within the data
            '&lt;p>{name}&lt;/p>',
        '&lt;/tpl>&lt;/p>'
    );
    tpl.overwrite(panel.body, data);  // pass the root node of the data object
     * </code></pre>
     * <p>Flat arrays that contain values (and not objects) can be auto-rendered
     * using the special <b><tt>{.}</tt></b> variable inside a loop.  This variable
     * will represent the value of the array at the current index:</p>
     * <pre><code>
    var tpl = new Ext.XTemplate(
        '&lt;p>{name}\&#39;s favorite beverages:&lt;/p>',
        '&lt;tpl for="drinks">',
           '&lt;div> - {.}&lt;/div>',
        '&lt;/tpl>'
    );
    tpl.overwrite(panel.body, data);
     * </code></pre>
     * <p>When processing a sub-template, for example while looping through a child array,
     * you can access the parent object's members via the <b><tt>parent</tt></b> object:</p>
     * <pre><code>
    var tpl = new Ext.XTemplate(
        '&lt;p>Name: {name}&lt;/p>',
        '&lt;p>Kids: ',
        '&lt;tpl for="kids">',
            '&lt;tpl if="age > 1">',
                '&lt;p>{name}&lt;/p>',
                '&lt;p>Dad: {<b>parent</b>.name}&lt;/p>',
            '&lt;/tpl>',
        '&lt;/tpl>&lt;/p>'
    );
    tpl.overwrite(panel.body, data);
     * </code></pre>
     * </div>
     * </li>
     *
     *
     * <li><b><u>Conditional processing with basic comparison operators</u></b>
     * <div class="sub-desc">
     * <p>The <b><tt>tpl</tt></b> tag and the <b><tt>if</tt></b> operator are used
     * to provide conditional checks for deciding whether or not to render specific
     * parts of the template. Notes:<div class="sub-desc"><ul>
     * <li>Double quotes must be encoded if used within the conditional</li>
     * <li>There is no <tt>else</tt> operator &mdash; if needed, two opposite
     * <tt>if</tt> statements should be used.</li>
     * </ul></div>
     * <pre><code>
    &lt;tpl if="age &gt; 1 &amp;&amp; age &lt; 10">Child&lt;/tpl>
    &lt;tpl if="age >= 10 && age < 18">Teenager&lt;/tpl>
    &lt;tpl <b>if</b>="this.isGirl(name)">...&lt;/tpl>
    &lt;tpl <b>if</b>="id==\'download\'">...&lt;/tpl>
    &lt;tpl <b>if</b>="needsIcon">&lt;img src="{icon}" class="{iconCls}"/>&lt;/tpl>
    // no good:
    &lt;tpl if="name == "Jack"">Hello&lt;/tpl>
    // encode &#34; if it is part of the condition, e.g.
    &lt;tpl if="name == &#38;quot;Jack&#38;quot;">Hello&lt;/tpl>
     * </code></pre>
     * Using the sample data above:
     * <pre><code>
    var tpl = new Ext.XTemplate(
        '&lt;p>Name: {name}&lt;/p>',
        '&lt;p>Kids: ',
        '&lt;tpl for="kids">',
            '&lt;tpl if="age > 1">',
                '&lt;p>{name}&lt;/p>',
            '&lt;/tpl>',
        '&lt;/tpl>&lt;/p>'
    );
    tpl.overwrite(panel.body, data);
     * </code></pre>
     * </div>
     * </li>
     *
     *
     * <li><b><u>Basic math support</u></b>
     * <div class="sub-desc">
     * <p>The following basic math operators may be applied directly on numeric
     * data values:</p><pre>
     * + - * /
     * </pre>
     * For example:
     * <pre><code>
    var tpl = new Ext.XTemplate(
        '&lt;p>Name: {name}&lt;/p>',
        '&lt;p>Kids: ',
        '&lt;tpl for="kids">',
            '&lt;tpl if="age &amp;gt; 1">',  // <-- Note that the &gt; is encoded
                '&lt;p>{#}: {name}&lt;/p>',  // <-- Auto-number each item
                '&lt;p>In 5 Years: {age+5}&lt;/p>',  // <-- Basic math
                '&lt;p>Dad: {parent.name}&lt;/p>',
            '&lt;/tpl>',
        '&lt;/tpl>&lt;/p>'
    );
    tpl.overwrite(panel.body, data);
    </code></pre>
     * </div>
     * </li>
     *
     *
     * <li><b><u>Execute arbitrary inline code with special built-in template variables</u></b>
     * <div class="sub-desc">
     * <p>Anything between <code>{[ ... ]}</code> is considered code to be executed
     * in the scope of the template. There are some special variables available in that code:
     * <ul>
     * <li><b><tt>values</tt></b>: The values in the current scope. If you are using
     * scope changing sub-templates, you can change what <tt>values</tt> is.</li>
     * <li><b><tt>parent</tt></b>: The scope (values) of the ancestor template.</li>
     * <li><b><tt>xindex</tt></b>: If you are in a looping template, the index of the
     * loop you are in (1-based).</li>
     * <li><b><tt>xcount</tt></b>: If you are in a looping template, the total length
     * of the array you are looping.</li>
     * <li><b><tt>fm</tt></b>: An alias for <tt>Ext.util.Format</tt>.</li>
     * </ul>
     * This example demonstrates basic row striping using an inline code block and the
     * <tt>xindex</tt> variable:</p>
     * <pre><code>
    var tpl = new Ext.XTemplate(
        '&lt;p>Name: {name}&lt;/p>',
        '&lt;p>Company: {[values.company.toUpperCase() + ", " + values.title]}&lt;/p>',
        '&lt;p>Kids: ',
        '&lt;tpl for="kids">',
           '&lt;div class="{[xindex % 2 === 0 ? "even" : "odd"]}">',
            '{name}',
            '&lt;/div>',
        '&lt;/tpl>&lt;/p>'
    );
    tpl.overwrite(panel.body, data);
     * </code></pre>
     * </div>
     * </li>
     *
     * <li><b><u>Template member functions</u></b>
     * <div class="sub-desc">
     * <p>One or more member functions can be specified in a configuration
     * object passed into the XTemplate constructor for more complex processing:</p>
     * <pre><code>
    var tpl = new Ext.XTemplate(
        '&lt;p>Name: {name}&lt;/p>',
        '&lt;p>Kids: ',
        '&lt;tpl for="kids">',
            '&lt;tpl if="this.isGirl(name)">',
                '&lt;p>Girl: {name} - {age}&lt;/p>',
            '&lt;/tpl>',
            // use opposite if statement to simulate 'else' processing:
            '&lt;tpl if="this.isGirl(name) == false">',
                '&lt;p>Boy: {name} - {age}&lt;/p>',
            '&lt;/tpl>',
            '&lt;tpl if="this.isBaby(age)">',
                '&lt;p>{name} is a baby!&lt;/p>',
            '&lt;/tpl>',
        '&lt;/tpl>&lt;/p>',
        {
            // XTemplate configuration:
            compiled: true,
            disableFormats: true,
            // member functions:
            isGirl: function(name){
                return name == 'Sara Grace';
            },
            isBaby: function(age){
                return age < 1;
            }
        }
    );
    tpl.overwrite(panel.body, data);
     * </code></pre>
     * </div>
     * </li>
     *
     * </ul></div>
     *
     * @param {Mixed} config
     */
    Ext.XTemplate = function(){
        Ext.XTemplate.superclass.constructor.apply(this, arguments);

        var me = this,
            s = me.html,
            re = /<tpl\b[^>]*>((?:(?=([^<]+))\2|<(?!tpl\b[^>]*>))*?)<\/tpl>/,
            nameRe = /^<tpl\b[^>]*?for="(.*?)"/,
            ifRe = /^<tpl\b[^>]*?if="(.*?)"/,
            execRe = /^<tpl\b[^>]*?exec="(.*?)"/,
            m,
            id = 0,
            tpls = [],
            VALUES = 'values',
            PARENT = 'parent',
            XINDEX = 'xindex',
            XCOUNT = 'xcount',
            RETURN = 'return ',
            WITHVALUES = 'with(values){ ';

        s = ['<tpl>', s, '</tpl>'].join('');

        while((m = s.match(re))){
            var m2 = m[0].match(nameRe),
                m3 = m[0].match(ifRe),
                m4 = m[0].match(execRe),
                exp = null,
                fn = null,
                exec = null,
                name = m2 && m2[1] ? m2[1] : '';

           if (m3) {
               exp = m3 && m3[1] ? m3[1] : null;
               if(exp){
                   fn = new Function(VALUES, PARENT, XINDEX, XCOUNT, WITHVALUES + RETURN +(Ext.util.Format.htmlDecode(exp))+'; }');
               }
           }
           if (m4) {
               exp = m4 && m4[1] ? m4[1] : null;
               if(exp){
                   exec = new Function(VALUES, PARENT, XINDEX, XCOUNT, WITHVALUES +(Ext.util.Format.htmlDecode(exp))+'; }');
               }
           }
           if(name){
               switch(name){
                   case '.': name = new Function(VALUES, PARENT, WITHVALUES + RETURN + VALUES + '; }'); break;
                   case '..': name = new Function(VALUES, PARENT, WITHVALUES + RETURN + PARENT + '; }'); break;
                   default: name = new Function(VALUES, PARENT, WITHVALUES + RETURN + name + '; }');
               }
           }
           tpls.push({
                id: id,
                target: name,
                exec: exec,
                test: fn,
                body: m[1]||''
            });
           s = s.replace(m[0], '{xtpl'+ id + '}');
           ++id;
        }
        for(var i = tpls.length-1; i >= 0; --i){
            me.compileTpl(tpls[i]);
        }
        me.master = tpls[tpls.length-1];
        me.tpls = tpls;
    };
    Ext.extend(Ext.XTemplate, Ext.Template, {
        // private
        re : /\{([\w\-\.\#]+)(?:\:([\w\.]*)(?:\((.*?)?\))?)?(\s?[\+\-\*\\]\s?[\d\.\+\-\*\\\(\)]+)?\}/g,
        // private
        codeRe : /\{\[((?:\\\]|.|\n)*?)\]\}/g,

        // private
        applySubTemplate : function(id, values, parent, xindex, xcount){
            var me = this,
                len,
                t = me.tpls[id],
                vs,
                buf = [];
            if ((t.test && !t.test.call(me, values, parent, xindex, xcount)) ||
                (t.exec && t.exec.call(me, values, parent, xindex, xcount))) {
                return '';
            }
            vs = t.target ? t.target.call(me, values, parent) : values;
            len = vs.length;
            parent = t.target ? values : parent;
            if(t.target && Ext.isArray(vs)){
                for(var i = 0, len = vs.length; i < len; i++){
                    buf[buf.length] = t.compiled.call(me, vs[i], parent, i+1, len);
                }
                return buf.join('');
            }
            return t.compiled.call(me, vs, parent, xindex, xcount);
        },

        // private
        compileTpl : function(tpl){
            var fm = Ext.util.Format,
                useF = this.disableFormats !== true,
                sep = Ext.isGecko ? "+" : ",",
                body;

            function fn(m, name, format, args, math){
                if(name.substr(0, 4) == 'xtpl'){
                    return "'"+ sep +'this.applySubTemplate('+name.substr(4)+', values, parent, xindex, xcount)'+sep+"'";
                }
                var v;
                if(name === '.'){
                    v = 'values';
                }else if(name === '#'){
                    v = 'xindex';
                }else if(name.indexOf('.') != -1){
                    v = name;
                }else{
                    v = "values['" + name + "']";
                }
                if(math){
                    v = '(' + v + math + ')';
                }
                if (format && useF) {
                    args = args ? ',' + args : "";
                    if(format.substr(0, 5) != "this."){
                        format = "fm." + format + '(';
                    }else{
                        format = 'this.call("'+ format.substr(5) + '", ';
                        args = ", values";
                    }
                } else {
                    args= ''; format = "("+v+" === undefined ? '' : ";
                }
                return "'"+ sep + format + v + args + ")"+sep+"'";
            }

            function codeFn(m, code){
                // Single quotes get escaped when the template is compiled, however we want to undo this when running code.
                return "'" + sep + '(' + code.replace(/\\'/g, "'") + ')' + sep + "'";
            }

            // branched to use + in gecko and [].join() in others
            if(Ext.isGecko){
                body = "tpl.compiled = function(values, parent, xindex, xcount){ return '" +
                       tpl.body.replace(/(\r\n|\n)/g, '\\n').replace(/'/g, "\\'").replace(this.re, fn).replace(this.codeRe, codeFn) +
                        "';};";
            }else{
                body = ["tpl.compiled = function(values, parent, xindex, xcount){ return ['"];
                body.push(tpl.body.replace(/(\r\n|\n)/g, '\\n').replace(/'/g, "\\'").replace(this.re, fn).replace(this.codeRe, codeFn));
                body.push("'].join('');};");
                body = body.join('');
            }
            eval(body);
            return this;
        },

        /**
         * Returns an HTML fragment of this template with the specified values applied.
         * @param {Object} values The template values. Can be an array if your params are numeric (i.e. {0}) or an object (i.e. {foo: 'bar'})
         * @return {String} The HTML fragment
         */
        applyTemplate : function(values){
            return this.master.compiled.call(this, values, {}, 1, 1);
        },

        /**
         * Compile the template to a function for optimized performance.  Recommended if the template will be used frequently.
         * @return {Function} The compiled function
         */
        compile : function(){return this;}

        /**
         * @property re
         * @hide
         */
        /**
         * @property disableFormats
         * @hide
         */
        /**
         * @method set
         * @hide
         */

    });
    /**
     * Alias for {@link #applyTemplate}
     * Returns an HTML fragment of this template with the specified values applied.
     * @param {Object/Array} values The template values. Can be an array if your params are numeric (i.e. {0}) or an object (i.e. {foo: 'bar'})
     * @return {String} The HTML fragment
     * @member Ext.XTemplate
     * @method apply
     */
    Ext.XTemplate.prototype.apply = Ext.XTemplate.prototype.applyTemplate;

    /**
     * Creates a template from the passed element's value (<i>display:none</i> textarea, preferred) or innerHTML.
     * @param {String/HTMLElement} el A DOM element or its id
     * @return {Ext.Template} The created template
     * @static
     */
    Ext.XTemplate.from = function(el){
        el = Ext.getDom(el);
        return new Ext.XTemplate(el.value || el.innerHTML);
    };