[CSV] The Feature Multiple-Character Delimiter

[Chen Guoping1]

Hi, all 




In CSV parsing, there are many scenarios where multiple characters are used as 
separators, 

To support this feature, we should change the char type of delimiter to String. 
This will lead to 

API changes, and old usage code may need to be modified to pass.




When parsing we can get the character array in advance through lookAhead(int n) 
in the 

ExtendedBufferedReader to determine whether it is a delimiter




    char[] lookAhead(int n) throws IOException {

        char[] buf = new char[n];

        super.mark(n);

        super.read(buf, 0, n);

        super.reset();

        return buf;

    }




I have a little problem to confirm. The escape character is' \ ',  when 
delimiter is a char ','  
printWithEscape print '\,' , so when delimiter is multiple characters  "[|]" 
printWithEscape 
print ’“\[\|\]” or print "\[|]"? I'd prefer to print "\[\|\]". Is there more 
any suggestion about 
this feature ?


——
Chen Guoping