fix: add case for quoted empty field value in csv record

* Handles quoted empty field values which appear in a CSV record row.

Fixes #115

Author: mrodrig

src/csv2json.js

@@ -158,6 +158,12 @@ const Csv2Json = function(options) {
                 stateVariables.startIndex = index + 2; // next value starts after the field delimiter
                 stateVariables.insideWrapDelimiter = false;
                 stateVariables.parsingValue = false;
+            } else if (character === options.delimiter.wrap && charBefore === options.delimiter.field &&
+                !stateVariables.insideWrapDelimiter && !stateVariables.parsingValue) {
+
+                stateVariables.startIndex = index;
+                stateVariables.insideWrapDelimiter = true;
+                stateVariables.parsingValue = true;
             } else if (character === options.delimiter.wrap && charBefore === options.delimiter.field &&
                 !stateVariables.insideWrapDelimiter && stateVariables.parsingValue) {
                 // If we reached a wrap delimiter with a field delimiter after it (ie. ,"*)

test/data/csv/emptyFieldValues.csv

@@ -1,3 +1,4 @@
 arrayOfStrings,object.subField,isBoolean,optionalField,number
 "[""test1"",""test2""]",,true,this one has it,
-"[""test3"",""test4""]",subValue,false,,7
+"[""test3"",""test4""]",subValue,false,,7
+"",test123,false,"",13

test/data/json/emptyFieldValues.js

@@ -12,5 +12,12 @@ module.exports = [
         number: 7,
         isBoolean: false,
         optionalField: null
+    },
+    {
+        arrayOfStrings: '',
+        object: { subField: 'test123' },
+        number: 13,
+        isBoolean: false,
+        optionalField: ''
     }
 ];

test/json2csv.js

@@ -356,7 +356,14 @@ function runTests(jsonTestData, csvTestData) {
                 jsonTestData.emptyFieldValues[0].number = undefined;
                 converter.json2csv(jsonTestData.emptyFieldValues, (err, csv) => {
                     if (err) done(err);
-                    csv.should.equal(csvTestData.emptyFieldValues);
+
+                    // Replace double quotation marks around the empty field which are used
+                    //   to verify that csv2json properly handles that case
+                    let expectedCsv = csvTestData.emptyFieldValues
+                        .replace(',"",', ',,')
+                        .replace(/\n"",/g, '\n,');
+
+                    csv.should.equal(expectedCsv);
                     done();
                 }, {
                     emptyFieldValue: ''