csv-array/csv-array.js

Intelligent CSV parser created and made for nodeJS. Which takes a csv file and produce an array from it.

module.exports = {
	
	parseCSV : function(fileName, callBack, considerFirstRowAsHeading) {
		if(typeof considerFirstRowAsHeading == "undefined") {
			considerFirstRowAsHeading = true;
		}
		var presentInstance = this;
		var fs = require('fs');
		fs.exists(fileName, function(exists) {
			if(exists) {
				presentInstance.parseFile(fileName, callBack, considerFirstRowAsHeading);
			} else {
				console.log("The provided file " + fileName + " doesn't exists or inaccessible");
			}
		});
	},

	// returns data from a single line 
	getDataFromLine : function(line) {
		var dataArray = [];
		var tempString="";
		var lineLength = line.length;
		var index=0;
		while(index<lineLength) {
			if(line[index]=='"') {
				var index2 = index+1;
				while(line[index2]!='"') {
					tempString+=line[index2];
					index2++;
				}
				dataArray.push(tempString);
				tempString = "";
				index = index2+2;
				continue;
			}
			if(line[index]!=",") {
				tempString += line[index];
				index++; continue;
			} 
			if(line[index]==",") {
				dataArray.push(tempString);
				tempString = "";
				index++;continue;
			}

		}
		dataArray.push(tempString);
		return dataArray;
	},
	
	parseFile : function(fileName, callBack, considerFirstRowAsHeading) {
		var presentObject = module.exports;
		var lblReader = require('line-by-line');
		var readStream = new lblReader(fileName);

		var tempDataArray = [];
		var tempAttributeNameArray = [];
		var tempLineCounter = 0;
		
		readStream.on('error', function(){
			console.log("cannot read the file any more.");
		});
		
		readStream.on('line', function(line) {
			readStream.pause();
			if(tempLineCounter == 0) {
				tempAttributeNameArray = line.split(",");
				if(!considerFirstRowAsHeading) {
					if(tempAttributeNameArray.length == 1) {
						tempDataArray.push(line);	
					} else {
						tempDataArray.push(tempAttributeNameArray);
					}
				}
				tempLineCounter = 1;
			} else {
				tempDataArray.push(presentObject.buildOutputData(tempAttributeNameArray, line, considerFirstRowAsHeading));
				
			}
	        readStream.resume();
		    
			
		});
		
		readStream.on('end', function() {
			if(tempDataArray.length == 0) {
				tempDataArray = tempAttributeNameArray;
			}
			callBack(tempDataArray);
		});
	},

	buildOutputData : function(tempAttributeNameArray, line, considerFirstRowAsHeading) {
		var presentObject = module.exports;
		var dataArray = presentObject.getDataFromLine(line);
		if(!considerFirstRowAsHeading) {
			if(tempAttributeNameArray.length == 1) {
				return dataArray[0];
			} else {
				return dataArray;
			}
		} else {
			var tempObject = {};
			var tempAttributeNameArrayLength = tempAttributeNameArray.length;
			for(var index=0; index<tempAttributeNameArrayLength; index++) {
				tempObject[tempAttributeNameArray[index]] = ((typeof dataArray[index]!="undefined")?dataArray[index]:"");
			}
			return tempObject;
		}
	}

}