alasql/src/58json.js

AlaSQL.js - JavaScript SQL database library for relational and graph data manipulation with support of localStorage, IndexedDB, and Excel

/*
//
// JSON for Alasql.js
// Date: 19.11.2014
// (c) 2014, Andrey Gershun
//
*/

yy.Json = function (params) { return yy.extend(this, params); }
yy.Json.prototype.toString = function() {
	var s = ''; // '@'
	s += JSONtoString(this.value);
	s += '';
	return s;
};

var JSONtoString = alasql.utils.JSONtoString = function (obj) {
	var s = '';
	if(typeof obj == "string") s = '"'+obj+'"';
	else if(typeof obj == "number") s = obj;
	else if(typeof obj == "boolean") s = obj;
	else if(typeof obj == "object") {
		if(obj instanceof Array) {
			s += '['+obj.map(function(b){
				return JSONtoString(b);
			}).join(',')+']';
		} else if(!obj.toJavaScript || obj instanceof yy.Json) {
			// to prevent recursion
			s = '{';
			var ss = [];
			for(var k in obj) {
				var s1 = ''; 
				if(typeof k == "string") s1 += '"'+k+'"';
				else if(typeof k == "number") s1 += k;
				else if(typeof k == "boolean") s1 += k;
				else {
					throw new Error('THis is not ES6... no expressions on left side yet');
				}
				s1 += ':'+JSONtoString(obj[k]);
				ss.push(s1);
			};
			s += ss.join(',')+'}';
		} else if(obj.toString)	{
			s = obj.toString();
		} else {
			throw new Error('1Can not show JSON object '+JSON.stringify(obj));
		}
	} else {
		throw new Error('2Can not show JSON object '+JSON.stringify(obj));		
	}

	return s;
}



function JSONtoJavaScript(obj, context, tableid, defcols) {
	var s = '';
	if(typeof obj == "string") s = '"'+obj+'"';
	else if(typeof obj == "number") s = '('+obj+')';
	else if(typeof obj == "boolean") s = obj;
	else if(typeof obj == "object") {
		if(obj instanceof Array) {
			s += '['+obj.map(function(b){
				return JSONtoJavaScript(b, context, tableid, defcols);
			}).join(',')+']';
		} else if(!obj.toJavaScript || obj instanceof yy.Json) {
			// to prevent recursion
			s = '{';
			var ss = [];
			for(var k in obj) {
				var s1 = ''; 
				if(typeof k == "string") s1 += '"'+k+'"';
				else if(typeof k == "number") s1 += k;
				else if(typeof k == "boolean") s1 += k;
				else {
					throw new Error('THis is not ES6... no expressions on left side yet');
				}
				s1 += ':'+JSONtoJavaScript(obj[k], context, tableid, defcols);
				ss.push(s1);
			};
			s += ss.join(',')+'}';
		} else if(obj.toJavaScript)	{
			s = obj.toJavaScript(context, tableid, defcols);
		} else {
			throw new Error('1Can not parse JSON object '+JSON.stringify(obj));
		}
	} else {
		throw new Error('2Can not parse JSON object '+JSON.stringify(obj));		
	}

	return s;
}

yy.Json.prototype.toJavaScript = function(context, tableid, defcols) {
	// TODO reod
	return JSONtoJavaScript(this.value,context, tableid, defcols);
}