Strip first and last quote in each token

reader.groovy

@@ -19,21 +19,38 @@ assert unescape('asdf') == 'asdf'
 List<String> splitLine(String line) {
     List<String> tokens = []
     String currentToken = ''
+    boolean isFirstCharacterInToken = true
+    List<String> tokenQuotes = []
     line.each {
         if (it == ',') {
+            // end of token
             tokens << currentToken
             currentToken = ''
+            tokenQuotes = []
+            isFirstCharacterInToken = true
+        } else if (it == '"') {
+            if (!isFirstCharacterInToken) {
+                tokenQuotes << it
+                isFirstCharacterInToken = false
+            }
         } else {
+            // simple character
+            currentToken += tokenQuotes.join('')
+            tokenQuotes = []
             currentToken += it
+            isFirstCharacterInToken = false
         }
     }
+    // add last token, because it didn't have a trailing comma
     tokens << currentToken
     return tokens
 }
 
 assert splitLine('a,b,c') == ['a', 'b', 'c']
 assert splitLine('"a","b","c"') == ['a', 'b', 'c']
-assert splitLine('"as""df","qwer""') == ['as"df', 'qwer"']
+assert splitLine('"as""df"') == ['as"df']
+assert splitLine('"as""df","qwer"""') == ['as"df', 'qwer"']
+assert splitLine('"as,df","qwer,""",""",zxcv"') == ['as,df', 'qwer,"', '",zxcv']
 
 List<String> lines = new File('data.csv').readLines()