fix(reducer-gtfsplus): fix column parsing for gtfsplus csv

lib/gtfsplus/reducers/gtfsplus.js

@@ -33,17 +33,16 @@ const gtfsplus = (state = {
     case 'RECEIVE_GTFSPLUS_CONTENT':
       const newTableData = {}
       for (let i = 0; i < action.filenames.length; i++) {
+        // split file into lines
         const lines = action.fileContent[i].split(/\r\n|\r|\n/g)
         if (lines.length < 2) continue
-        // console.log(lines[0])
         const fields = lines[0].split(',')
-        // console.log(fields)
-        // console.log(fields[fields.length - 1])
+        const COLUMN_REGEX = /,(?=(?:(?:[^"]*"){2})*[^"]*$)/
         const tableName = action.filenames[i].split('.')[0]
         newTableData[tableName] = lines.slice(1)
-          .filter(line => line.split(',').length === fields.length)
+          .filter(line => line.split(COLUMN_REGEX).length === fields.length)
           .map((line, rowIndex) => {
-            const values = line.split(',')
+            const values = line.split(COLUMN_REGEX)
             const rowData = { origRowIndex: rowIndex }
             for (let f = 0; f < fields.length; f++) {
               rowData[fields[f]] = values[f]