xtemplate.js

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/*
 * Ext JS Library 2.0 Beta 1
 * Copyright(c) 2006-2007, Ext JS, LLC.
 * [e-mail]
 * 
 * http://extjs.com/license
 */

/**
* @class Ext.XTemplate
* A template class that supports advanced functionality like autofilling arrays, conditional processing with
* basic comparison operators, sub-templates, basic math function support, special built-in template variables,
* inline code execution and more.
* @constructor
* @param {String/Array} html The HTML fragment or an array of fragments to join("") or multiple arguments to join("")
*/
Ext.XTemplate = function(){
    Ext.XTemplate.superclass.constructor.apply(this, arguments);
    var s = this.html;

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

    var re = /<tpl\b[^>]*>((?:(?=([^<]+))\2|<(?!tpl\b[^>]*>))*?)<\/tpl>/;

    var nameRe = /^<tpl\b[^>]*?for="(.*?)"/;
    var ifRe = /^<tpl\b[^>]*?if="(.*?)"/;
    var execRe = /^<tpl\b[^>]*?exec="(.*?)"/;
    var m, id = 0;
    var tpls = [];

    while(m = s.match(re)){
       var m2 = m[0].match(nameRe);
       var m3 = m[0].match(ifRe);
       var m4 = m[0].match(execRe);
       var exp = null, fn = null, exec = null;
       var name = m2 && m2[1] ? m2[1] : '';
       if(m3){
           exp = m3 && m3[1] ? m3[1] : null;
           if(exp){
               fn = new Function('values', 'parent', 'xindex', 'xcount', 'with(values){ return '+(Ext.util.Format.htmlDecode(exp))+'; }');
           }
       }
       if(m4){
           exp = m4 && m4[1] ? m4[1] : null;
           if(exp){
               exec = new Function('values', 'parent', 'xindex', 'xcount', 'with(values){ '+(Ext.util.Format.htmlDecode(exp))+'; }');
           }
       }
       if(name){
           switch(name){
               case '.': name = new Function('values', 'parent', 'with(values){ return values; }'); break;
               case '..': name = new Function('values', 'parent', 'with(values){ return parent; }'); break;
               default: name = new Function('values', 'parent', 'with(values){ 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){
        this.compileTpl(tpls[i]);
    }
    this.master = tpls[tpls.length-1];
    this.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 t = this.tpls[id];
        if(t.test && !t.test.call(this, values, parent, xindex, xcount)){
            return '';
        }
        if(t.exec && t.exec.call(this, values, parent, xindex, xcount)){
            return '';
        }
        var vs = t.target ? t.target.call(this, values, parent) : values;
        parent = t.target ? values : parent;
        if(t.target && vs instanceof Array){
            var buf = [];
            for(var i = 0, len = vs.length; i < len; i++){
                buf[buf.length] = t.compiled.call(this, vs[i], parent, i+1, len);
            }
            return buf.join('');
        }
        return t.compiled.call(this, vs, parent, xindex, xcount);
    },

    // private
    compileTpl : function(tpl){
        var fm = Ext.util.Format;
        var useF = this.disableFormats !== true;
        var sep = Ext.isGecko ? "+" : ",";
        var fn = function(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+"'";
        };
        var codeFn = function(m, code){
            return "'"+ sep +'('+code+')'+sep+"'";
        };

        var body;
        // 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;
    },

    /**
     * Alias of {@link #applyTemplate}.
     */
    apply : function(values){
        return this.master.compiled.call(this, values, {}, 1, 1);
    },

    /**
     * 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;}
});

/**
 * 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
 * @returns {Ext.Template} The created template
 * @static
 */
Ext.XTemplate.from = function(el){
    el = Ext.getDom(el);
    return new Ext.XTemplate(el.value || el.innerHTML);
};