Strings and Things - Java - page 115

break break ;

}
} else

else iif ( s . charAt ( j ) == '"' && j + 1 == len ) { // end quote @ line end
break

break ; //done

}
sb . append ( s . charAt ( j )); // regular character.

}
return return j ;

}

/** advPlain: unquoted field; return index of next separator */
protected

protected int int advPlain ( String s , StringBuffer sb , int int i )

{

int int j ;

j = s . indexOf ( fieldSep , i ); // look for separator
Debug . println ( "csv" , "i = " + i + ", j = " + j );
iif ( j == - 1 ) { // none found

sb . append ( s . substring ( i ));
return return s . length ();

} else

else {
sb . append ( s . substring ( i , j ));
return

return j ;

}

}

}

In the online source directory, you'll find CSVFile.java , which reads a text file and runs it
through parse() . You'll also find Kernighan and Pike's original C++ program.

We haven't discussed regular expressions yet (we will in Chapter 4 ) . However, many readers
are familiar with regexes in a general way, so the following example demonstrates the power
of regexes, as well as providing code for you to reuse. Note that the following program re-
places all the code in both CSV.java and CSVFile.java (the key to understanding regexes is
that a little specification can match a lot of data): [ 15 ]

// package com.darwinsys.csv;
public public class implements CSVParser {

/** The rather involved pattern used to match CSV's consists of three
* alternations: the first matches a quoted field, the second unquoted,
* the third a null field.
*/
public

class CSVRE CSVRE implements

public static final String CSV_PATTERN =

"\"([^\"]+?)\",?|([^,]+),?|," ;

static final