json.excel/libs/handing.js

json to excel,or excel to json

/*
 * 
 */

var FIELDS={
    WORKSHEETS:'worksheets',
    NAME:'name',
    DATA:'data',
    VALUE:'value',
    FORMATCODE:'formatCode'
};
function kv(keys,data){
    var i=0;
    var len=keys.length;
    var json={};
    for(;i<len;i++){
        (function(k,d){
            var v=d[FIELDS.VALUE];
            v=v === undefined ? '' : v;
            json[k[FIELDS.VALUE]]=v;
        })(keys[i],data[i]||{});
    }
    
    return json;
};
function vk(data,type){
    var json=[];
    //get key
    if(type === 'key'){
        
        for(var k in data){
            var j={};
            j[FIELDS.VALUE]=k;
            json.push(j);
        }
        
        return json;
    }
    //get value
    for(var k in data){
        var j={};
            j[FIELDS.VALUE]=data[k];
            json.push(j);
    }
    
    return json;
};
//
function excel2json(data){
    var keys=data.splice(0,1);
    var json=[];
    var i=0;
    var len=data.length;
    for(;i<len;i++){
        (function(d){
            json.push(kv(keys[0],d));
        })(data[i]);
    }
    
    return json;
};
//
function json2excel(data){
    var json=[];
    var keys=data.slice(0,1);
    var i=0;
    var len=data.length;
    json.push(vk(keys[0],'key'));
    //return console.log(json);
    for(;i<len;i++){
        (function(d){
            json.push(vk(d));
        })(data[i]);
    }
    
    return json;
};
 
//excel to json
exports.excel2json=function(jsonstring){
    var json={};
    
    var worksheets=jsonstring[FIELDS.WORKSHEETS]||[];
    var len=worksheets.length;
    if(!len){
        
        return {};
    }
    
    var i=0;    
    for(;i<len;i++){
        var worksheet=worksheets[i];
        var name=worksheet[FIELDS.NAME];
        var data=worksheet[FIELDS.DATA];
        if(data.length < 2){
            //sheet data more than 2
            continue;
        }
        json[name]=excel2json(data);
    }
    
    return json;
};
//json to excel
exports.json2excel=function(jsonstring){
    var json={};
    json[FIELDS.WORKSHEETS]=[];
    for(var sheet in jsonstring){
        var data=jsonstring[sheet]||[];
        if(data.length < 2){
            
            continue;
        }
        
        var j={};
        j[FIELDS.NAME]=sheet;
        j[FIELDS.DATA]=[].concat(json2excel(data));
        json[FIELDS.WORKSHEETS].push(j);
    }
    
    return json;
};