xml2json.js

/*
 Copyright 2011-2013 Abdulla Abdurakhmanov
 Original sources are available at https://code.google.com/p/x2js/

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

(function (root, factory) {
     if (typeof define === "function" && define.amd) {
         define([], factory);
     } else if (typeof exports === "object") {
         module.exports = factory();
     } else {
         root.X2JS = factory();
     }
 }(this, function () {
	return function (config) {
		'use strict';
			
		var VERSION = "1.2.0";
		
		config = config || {};
		initConfigDefaults();
		initRequiredPolyfills();
		
		function initConfigDefaults() {
			if(config.escapeMode === undefined) {
				config.escapeMode = true;
			}
			
			if(config.attributePrefix === undefined) {
				config.attributePrefix = "_";
			}
			
			config.arrayAccessForm = config.arrayAccessForm || "none";
			config.emptyNodeForm = config.emptyNodeForm || "text";		
			
			if(config.enableToStringFunc === undefined) {
				config.enableToStringFunc = true; 
			}
			config.arrayAccessFormPaths = config.arrayAccessFormPaths || []; 
			if(config.skipEmptyTextNodesForObj === undefined) {
				config.skipEmptyTextNodesForObj = true;
			}
			if(config.stripWhitespaces === undefined) {
				config.stripWhitespaces = true;
			}
			config.datetimeAccessFormPaths = config.datetimeAccessFormPaths || [];
	
			if(config.useDoubleQuotes === undefined) {
				config.useDoubleQuotes = false;
			}
			
			config.xmlElementsFilter = config.xmlElementsFilter || [];
			config.jsonPropertiesFilter = config.jsonPropertiesFilter || [];
			
			if(config.keepCData === undefined) {
				config.keepCData = false;
			}
		}
	
		var DOMNodeTypes = {
			ELEMENT_NODE 	   : 1,
			TEXT_NODE    	   : 3,
			CDATA_SECTION_NODE : 4,
			COMMENT_NODE	   : 8,
			DOCUMENT_NODE 	   : 9
		};
		
		function initRequiredPolyfills() {		
		}
		
		function getNodeLocalName( node ) {
			var nodeLocalName = node.localName;			
			if(nodeLocalName == null) // Yeah, this is IE!! 
				nodeLocalName = node.baseName;
			if(nodeLocalName == null || nodeLocalName=="") // =="" is IE too
				nodeLocalName = node.nodeName;
			return nodeLocalName;
		}
		
		function getNodePrefix(node) {
			return node.prefix;
		}
			
		function escapeXmlChars(str) {
			if(typeof(str) == "string")
				return str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&apos;');
			else
				return str;
		}
	
		function unescapeXmlChars(str) {
			return str.replace(/&lt;/g, '<').replace(/&gt;/g, '>').replace(/&quot;/g, '"').replace(/&apos;/g, "'").replace(/&amp;/g, '&');
		}
		
		function checkInStdFiltersArrayForm(stdFiltersArrayForm, obj, name, path) {
			var idx = 0;
			for(; idx < stdFiltersArrayForm.length; idx++) {
				var filterPath = stdFiltersArrayForm[idx];
				if( typeof filterPath === "string" ) {
					if(filterPath == path)
						break;
				}
				else
				if( filterPath instanceof RegExp) {
					if(filterPath.test(path))
						break;
				}				
				else
				if( typeof filterPath === "function") {
					if(filterPath(obj, name, path))
						break;
				}
			}
			return idx!=stdFiltersArrayForm.length;
		}
		
		function toArrayAccessForm(obj, childName, path) {
			switch(config.arrayAccessForm) {
				case "property":
					if(!(obj[childName] instanceof Array))
						obj[childName+"_asArray"] = [obj[childName]];
					else
						obj[childName+"_asArray"] = obj[childName];
					break;
				/*case "none":
					break;*/
			}
			
			if(!(obj[childName] instanceof Array) && config.arrayAccessFormPaths.length > 0) {
				if(checkInStdFiltersArrayForm(config.arrayAccessFormPaths, obj, childName, path)) {
					obj[childName] = [obj[childName]];
				}			
			}
		}
		
		function fromXmlDateTime(prop) {
			// Implementation based up on http://stackoverflow.com/questions/8178598/xml-datetime-to-javascript-date-object
			// Improved to support full spec and optional parts
			var bits = prop.split(/[-T:+Z]/g);
			
			var d = new Date(bits[0], bits[1]-1, bits[2]);			
			var secondBits = bits[5].split("\.");
			d.setHours(bits[3], bits[4], secondBits[0]);
			if(secondBits.length>1)
				d.setMilliseconds(secondBits[1]);
	
			// Get supplied time zone offset in minutes
			if(bits[6] && bits[7]) {
				var offsetMinutes = bits[6] * 60 + Number(bits[7]);
				var sign = /\d\d-\d\d:\d\d$/.test(prop)? '-' : '+';
	
				// Apply the sign
				offsetMinutes = 0 + (sign == '-'? -1 * offsetMinutes : offsetMinutes);
	
				// Apply offset and local timezone
				d.setMinutes(d.getMinutes() - offsetMinutes - d.getTimezoneOffset())
			}
			else
				if(prop.indexOf("Z", prop.length - 1) !== -1) {
					d = new Date(Date.UTC(d.getFullYear(), d.getMonth(), d.getDate(), d.getHours(), d.getMinutes(), d.getSeconds(), d.getMilliseconds()));					
				}
	
			// d is now a local time equivalent to the supplied time
			return d;
		}
		
		function checkFromXmlDateTimePaths(value, childName, fullPath) {
			if(config.datetimeAccessFormPaths.length > 0) {
				var path = fullPath.split("\.#")[0];
				if(checkInStdFiltersArrayForm(config.datetimeAccessFormPaths, value, childName, path)) {
					return fromXmlDateTime(value);
				}
				else
					return value;			
			}
			else
				return value;
		}
		
		function checkXmlElementsFilter(obj, childType, childName, childPath) {
			if( childType == DOMNodeTypes.ELEMENT_NODE && config.xmlElementsFilter.length > 0) {
				return checkInStdFiltersArrayForm(config.xmlElementsFilter, obj, childName, childPath);	
			}
			else
				return true;
		}	
	
		function parseDOMChildren( node, path ) {
			if(node.nodeType == DOMNodeTypes.DOCUMENT_NODE) {
				var result = new Object;
				var nodeChildren = node.childNodes;
				// Alternative for firstElementChild which is not supported in some environments
				for(var cidx=0; cidx <nodeChildren.length; cidx++) {
					var child = nodeChildren.item(cidx);
					if(child.nodeType == DOMNodeTypes.ELEMENT_NODE) {
						var childName = getNodeLocalName(child);
						result[childName] = parseDOMChildren(child, childName);
					}
				}
				return result;
			}
			else
			if(node.nodeType == DOMNodeTypes.ELEMENT_NODE) {
				var result = new Object;
				result.__cnt=0;
				
				var nodeChildren = node.childNodes;
				
				// Children nodes
				for(var cidx=0; cidx <nodeChildren.length; cidx++) {
					var child = nodeChildren.item(cidx); // nodeChildren[cidx];
					var childName = getNodeLocalName(child);
					
					if(child.nodeType!= DOMNodeTypes.COMMENT_NODE) {
						var childPath = path+"."+childName;
						if (checkXmlElementsFilter(result,child.nodeType,childName,childPath)) {
							result.__cnt++;
							if(result[childName] == null) {
								result[childName] = parseDOMChildren(child, childPath);
								toArrayAccessForm(result, childName, childPath);					
							}
							else {
								if(result[childName] != null) {
									if( !(result[childName] instanceof Array)) {
										result[childName] = [result[childName]];
										toArrayAccessForm(result, childName, childPath);
									}
								}
								(result[childName])[result[childName].length] = parseDOMChildren(child, childPath);
							}
						}
					}								
				}
				
				// Attributes
				for(var aidx=0; aidx <node.attributes.length; aidx++) {
					var attr = node.attributes.item(aidx); // [aidx];
					result.__cnt++;
					result[config.attributePrefix+attr.name]=attr.value;
				}
				
				// Node namespace prefix
				var nodePrefix = getNodePrefix(node);
				if(nodePrefix!=null && nodePrefix!="") {
					result.__cnt++;
					result.__prefix=nodePrefix;
				}
				
				if(result["#text"]!=null) {				
					result.__text = result["#text"];
					if(result.__text instanceof Array) {
						result.__text = result.__text.join("\n");
					}
					//if(config.escapeMode)
					//	result.__text = unescapeXmlChars(result.__text);
					if(config.stripWhitespaces)
						result.__text = result.__text.trim();
					delete result["#text"];
					if(config.arrayAccessForm=="property")
						delete result["#text_asArray"];
					result.__text = checkFromXmlDateTimePaths(result.__text, childName, path+"."+childName);
				}
				if(result["#cdata-section"]!=null) {
					result.__cdata = result["#cdata-section"];
					delete result["#cdata-section"];
					if(config.arrayAccessForm=="property")
						delete result["#cdata-section_asArray"];
				}
				
				if( result.__cnt == 0 && config.emptyNodeForm=="text" ) {
					result = '';
				}
				else
				if( result.__cnt == 1 && result.__text!=null  ) {
					result = result.__text;
				}
				else
				if( result.__cnt == 1 && result.__cdata!=null && !config.keepCData  ) {
					result = result.__cdata;
				}			
				else			
				if ( result.__cnt > 1 && result.__text!=null && config.skipEmptyTextNodesForObj) {
					if( (config.stripWhitespaces && result.__text=="") || (result.__text.trim()=="")) {
						delete result.__text;
					}
				}
				delete result.__cnt;			
				
				if( config.enableToStringFunc && (result.__text!=null || result.__cdata!=null )) {
					result.toString = function() {
						return (this.__text!=null? this.__text:'')+( this.__cdata!=null ? this.__cdata:'');
					};
				}
				
				return result;
			}
			else
			if(node.nodeType == DOMNodeTypes.TEXT_NODE || node.nodeType == DOMNodeTypes.CDATA_SECTION_NODE) {
				return node.nodeValue;
			}	
		}
		
		function startTag(jsonObj, element, attrList, closed) {
			var resultStr = "<"+ ( (jsonObj!=null && jsonObj.__prefix!=null)? (jsonObj.__prefix+":"):"") + element;
			if(attrList!=null) {
				for(var aidx = 0; aidx < attrList.length; aidx++) {
					var attrName = attrList[aidx];
					var attrVal = jsonObj[attrName];
					if(config.escapeMode)
						attrVal=escapeXmlChars(attrVal);
					resultStr+=" "+attrName.substr(config.attributePrefix.length)+"=";
					if(config.useDoubleQuotes)
						resultStr+='"'+attrVal+'"';
					else
						resultStr+="'"+attrVal+"'";
				}
			}
			if(!closed)
				resultStr+=">";
			else
				resultStr+="/>";
			return resultStr;
		}
		
		function endTag(jsonObj,elementName) {
			return "</"+ (jsonObj.__prefix!=null? (jsonObj.__prefix+":"):"")+elementName+">";
		}
		
		function endsWith(str, suffix) {
			return str.indexOf(suffix, str.length - suffix.length) !== -1;
		}
		
		function jsonXmlSpecialElem ( jsonObj, jsonObjField ) {
			if((config.arrayAccessForm=="property" && endsWith(jsonObjField.toString(),("_asArray"))) 
					|| jsonObjField.toString().indexOf(config.attributePrefix)==0 
					|| jsonObjField.toString().indexOf("__")==0
					|| (jsonObj[jsonObjField] instanceof Function) )
				return true;
			else
				return false;
		}
		
		function jsonXmlElemCount ( jsonObj ) {
			var elementsCnt = 0;
			if(jsonObj instanceof Object ) {
				for( var it in jsonObj  ) {
					if(jsonXmlSpecialElem ( jsonObj, it) )
						continue;			
					elementsCnt++;
				}
			}
			return elementsCnt;
		}
		
		function checkJsonObjPropertiesFilter(jsonObj, propertyName, jsonObjPath) {
			return config.jsonPropertiesFilter.length == 0
				|| jsonObjPath==""
				|| checkInStdFiltersArrayForm(config.jsonPropertiesFilter, jsonObj, propertyName, jsonObjPath);	
		}
		
		function parseJSONAttributes ( jsonObj ) {
			var attrList = [];
			if(jsonObj instanceof Object ) {
				for( var ait in jsonObj  ) {
					if(ait.toString().indexOf("__")== -1 && ait.toString().indexOf(config.attributePrefix)==0) {
						attrList.push(ait);
					}
				}
			}
			return attrList;
		}
		
		function parseJSONTextAttrs ( jsonTxtObj ) {
			var result ="";
			
			if(jsonTxtObj.__cdata!=null) {										
				result+="<![CDATA["+jsonTxtObj.__cdata+"]]>";					
			}
			
			if(jsonTxtObj.__text!=null) {			
				if(config.escapeMode)
					result+=escapeXmlChars(jsonTxtObj.__text);
				else
					result+=jsonTxtObj.__text;
			}
			return result;
		}
		
		function parseJSONTextObject ( jsonTxtObj ) {
			var result ="";
	
			if( jsonTxtObj instanceof Object ) {
				result+=parseJSONTextAttrs ( jsonTxtObj );
			}
			else
				if(jsonTxtObj!=null) {
					if(config.escapeMode)
						result+=escapeXmlChars(jsonTxtObj);
					else
						result+=jsonTxtObj;
				}
			
			return result;
		}
		
		function getJsonPropertyPath(jsonObjPath, jsonPropName) {
			if (jsonObjPath==="") {
				return jsonPropName;
			}
			else
				return jsonObjPath+"."+jsonPropName;
		}
		
		function parseJSONArray ( jsonArrRoot, jsonArrObj, attrList, jsonObjPath ) {
			var result = ""; 
			if(jsonArrRoot.length == 0) {
				result+=startTag(jsonArrRoot, jsonArrObj, attrList, true);
			}
			else {
				for(var arIdx = 0; arIdx < jsonArrRoot.length; arIdx++) {
					result+=startTag(jsonArrRoot[arIdx], jsonArrObj, parseJSONAttributes(jsonArrRoot[arIdx]), false);
					result+=parseJSONObject(jsonArrRoot[arIdx], getJsonPropertyPath(jsonObjPath,jsonArrObj));
					result+=endTag(jsonArrRoot[arIdx],jsonArrObj);
				}
			}
			return result;
		}
		
		function parseJSONObject ( jsonObj, jsonObjPath ) {
			var result = "";	
	
			var elementsCnt = jsonXmlElemCount ( jsonObj );
			
			if(elementsCnt > 0) {
				for( var it in jsonObj ) {
					
					if(jsonXmlSpecialElem ( jsonObj, it) || (jsonObjPath!="" && !checkJsonObjPropertiesFilter(jsonObj, it, getJsonPropertyPath(jsonObjPath,it))) )
						continue;			
					
					var subObj = jsonObj[it];						
					
					var attrList = parseJSONAttributes( subObj )
					
					if(subObj == null || subObj == undefined) {
						result+=startTag(subObj, it, attrList, true);
					}
					else
					if(subObj instanceof Object) {
						
						if(subObj instanceof Array) {					
							result+=parseJSONArray( subObj, it, attrList, jsonObjPath );					
						}
						else if(subObj instanceof Date) {
							result+=startTag(subObj, it, attrList, false);
							result+=subObj.toISOString();
							result+=endTag(subObj,it);
						}
						else {
							var subObjElementsCnt = jsonXmlElemCount ( subObj );
							if(subObjElementsCnt > 0 || subObj.__text!=null || subObj.__cdata!=null) {
								result+=startTag(subObj, it, attrList, false);
								result+=parseJSONObject(subObj, getJsonPropertyPath(jsonObjPath,it));
								result+=endTag(subObj,it);
							}
							else {
								result+=startTag(subObj, it, attrList, true);
							}
						}
					}
					else {
						result+=startTag(subObj, it, attrList, false);
						result+=parseJSONTextObject(subObj);
						result+=endTag(subObj,it);
					}
				}
			}
			result+=parseJSONTextObject(jsonObj);
			
			return result;
		}
		
		this.parseXmlString = function(xmlDocStr) {
			var isIEParser = window.ActiveXObject || "ActiveXObject" in window;
			if (xmlDocStr === undefined) {
				return null;
			}
			var xmlDoc;
			if (window.DOMParser) {
				var parser=new window.DOMParser();			
				var parsererrorNS = null;
				// IE9+ now is here
				if(!isIEParser) {
					try {
						parsererrorNS = parser.parseFromString("INVALID", "text/xml").getElementsByTagName("parsererror")[0].namespaceURI;
					}
					catch(err) {					
						parsererrorNS = null;
					}
				}
				try {
					xmlDoc = parser.parseFromString( xmlDocStr, "text/xml" );
					if( parsererrorNS!= null && xmlDoc.getElementsByTagNameNS(parsererrorNS, "parsererror").length > 0) {
						//throw new Error('Error parsing XML: '+xmlDocStr);
						xmlDoc = null;
					}
				}
				catch(err) {
					xmlDoc = null;
				}
			}
			else {
				// IE :(
				if(xmlDocStr.indexOf("<?")==0) {
					xmlDocStr = xmlDocStr.substr( xmlDocStr.indexOf("?>") + 2 );
				}
				xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
				xmlDoc.async="false";
				xmlDoc.loadXML(xmlDocStr);
			}
			return xmlDoc;
		};
		
		this.asArray = function(prop) {
			if (prop === undefined || prop == null)
				return [];
			else
			if(prop instanceof Array)
				return prop;
			else
				return [prop];
		};
		
		this.toXmlDateTime = function(dt) {
			if(dt instanceof Date)
				return dt.toISOString();
			else
			if(typeof(dt) === 'number' )
				return new Date(dt).toISOString();
			else	
				return null;
		};
		
		this.asDateTime = function(prop) {
			if(typeof(prop) == "string") {
				return fromXmlDateTime(prop);
			}
			else
				return prop;
		};
	
		this.xml2json = function (xmlDoc) {
			return parseDOMChildren ( xmlDoc );
		};
		
		this.xml_str2json = function (xmlDocStr) {
			var xmlDoc = this.parseXmlString(xmlDocStr);
			if(xmlDoc!=null)
				return this.xml2json(xmlDoc);
			else
				return null;
		};
	
		this.json2xml_str = function (jsonObj) {
			return parseJSONObject ( jsonObj, "" );
		};
	
		this.json2xml = function (jsonObj) {
			var xmlDocStr = this.json2xml_str (jsonObj);
			return this.parseXmlString(xmlDocStr);
		};
		
		this.getVersion = function () {
			return VERSION;
		};	
	}
}))