csvToArray.js

module.exports.csvToArray = function ( strData, strDelimiter ) {
        // Check to see if the delimiter is defined. If not,
        // then default to comma.
        strDelimiter = (strDelimiter || ",");
        // Create a regular expression to parse the CSV values.
        var objPattern = new RegExp(
            (
                // Delimiters.
                "(\\" + strDelimiter + "|\\r?\\n|\\r|^)" +
                // Quoted fields.
                "(?:\"([^\"]*(?:\"\"[^\"]*)*)\"|" +
                // Standard fields.
                "([^\"\\" + strDelimiter + "\\r\\n]*))"
            ),
            "gi"
            );
        // Create an array to hold our data. Give the array
        // a default empty first row.
        var arrData = [[]];
        // Create an array to hold our individual pattern
        // matching groups.
        var arrMatches = null;
        // Keep looping over the regular expression matches
        // until we can no longer find a match.
        while (arrMatches = objPattern.exec( strData )){
            // Get the delimiter that was found.
            var strMatchedDelimiter = arrMatches[ 1 ];
            // Check to see if the given delimiter has a length
            // (is not the start of string) and if it matches
            // field delimiter. If id does not, then we know
            // that this delimiter is a row delimiter.
            if (
                strMatchedDelimiter.length &&
                (strMatchedDelimiter != strDelimiter)
                ){
                // Since we have reached a new row of data,
                // add an empty row to our data array.
                arrData.push( [] );
            }
            // Now that we have our delimiter out of the way,
            // let's check to see which kind of value we
            // captured (quoted or unquoted).
            if (arrMatches[ 2 ]){
                // We found a quoted value. When we capture
                // this value, unescape any double quotes.
                var strMatchedValue = arrMatches[ 2 ].replace(
                    new RegExp( "\"\"", "g" ),
                    "\""
                    );
            } else {
                // We found a non-quoted value.
                var strMatchedValue = arrMatches[ 3 ];
            }
            // Now that we have our value string, let's add
            // it to the data array.
            arrData[ arrData.length - 1 ].push( strMatchedValue );
        }
        // Return the parsed data.
        return( arrData );
    }