codekart/framework/core/view/view.js

Web application framework for Node.js

//html文档模板

var array  = load.tool('!array');
var file  = load.tool('!file');
var json = load.tool("!json");
var tppl = load.tool("!tppl");
var render = load.core("!server/render");
var css  = load.core('!view/css');
var tpl  = load.core('!view/tpl');
var js  = load.core('!view/js');
var data  = load.core('!view/data');
var config =  load.config();

var tppl_render_cache = {}; //页面解析缓存



//向客户端输出html
exports.render = function(request,response,viewpath){
    if(!viewpath){
        return render404(request,response);
    }

    var viewobj = load.view(viewpath);

    //log(viewobj);

    var stuff = viewobj.stuff
        , viewname = viewpath.replace(/\//g, "_"); //路径斜杠替换成下划线

    //客户端文件名
    stuff.client_name_js = '/js/'+viewname+'.'+config.version+'.js';
    stuff.client_name_css = '/css/'+viewname+'.'+config.version+'.css';

    var data_css
        , data_js
        , data_tpl
        , data_data;


    //获得 tpl 数据
    data.ready(viewobj,request,response,function(err,data){
        //log('//获得 tpl data 数据');
        //log(data);
        data_data = data;
        doRender(err);
    });


    //编译合并压缩 css 文件
    css.ready(stuff,function(err,data){
        //log('//获得 css 数据');
        //log(data);
        data_css = data;
        doRender(err);
    });

    //编译合并压缩 js 文件
    js.ready(stuff,function(err,data){
        //log('//获得 js 数据');
        //log(err);
        //log(data);
        data_js = data;
        doRender(err);
    });

    //编译合并压缩 tpl 文件
    tpl.ready(stuff,viewpath,function(err,data){
        //log('//获得 tpl 数据');
        //if(data) log(true);
        data_tpl = data;
        doRender(err);
    });


    //数据准备完毕  开始正式输出
    var breakRen = false; // 是否终止输出
    function doRender(err){
        //如果终止输出
        if(breakRen) return;

        //在 data() 函数内调用 callback(false) 中断执行
        if(data_data==false){
            breakRen = true;
            return;
        }

        //如果解析错误
        if(err){
            if(config.debug) log(err);
            request.error_msg = err;
            renderError(request,response);
            return false;
        }

        //验证数据是否准备完毕
        if(data_data===undefined
            ||data_tpl===undefined
            ||data_js===undefined
            ||data_css===undefined
            ){
            //if(!data_js) log(data_js);
            return false;
        }else{
            //log('!!!!!!!!!!!!!!!!!');
        }


        //log('正式开始解析');
        //正式开始解析
        var html = '';

        if(config.debug){

            html =  tppl(data_tpl, data_data); //不缓存，每次都从头解析

        }else{

            try{
                //log(tpl_html);
                //html = tpl_html;
                if(!config.compiled){  //如果非debug模式
                    if(!tppl_render_cache[viewname]){  //检测是否存在页面解析缓存
                        tppl_render_cache[viewname] = tppl(data_tpl); //没有则设置缓存
                    }
                    html =  tppl_render_cache[viewname](data_data);
                }else{
                    //log(data_data);
                    html =  tppl(data_tpl, data_data); //不缓存，每次都从头解析
                }
            }catch(e){
                if(config.debug) log(e);
                //log(e);
                //模板解析错误，返回错误页面
                request.error_msg = 'Template parsing error : '+e;  //错误消息
                return renderError(request,response,viewname);
            }


        }
        
        //正式返回客户端
        if(html){
            render.text(request, response, html);
        }
    }

};




function render404(request,response,name){
    if(name=='404'){
        response.end('404 not found this page !');
    }else{
        exports.render(request,response,'404');
    }

}


function renderError(request,response,name){
    if(name=='error'){
        response.end('500 system error !');
    }else{
        if(config.debug){
            if(request.error_msg)
                log(request.error_msg);
        }
        exports.render(request,response,'error');
    }

}