Strings and Things - Java - page 116

private private final final static static Pattern csvRE = Pattern . compile ( CSV_PATTERN );

public public static static void void main ( final final String [] argv ) throws throws IOException {

System . out . println ( CSV_PATTERN );
new new CSVRE (). process (

new

new BufferedReader ( new new InputStreamReader ( System . in )));

}

/** Process one file. Delegates to parse() a line at a time */
public

public void void process ( final final BufferedReader input ) throws throws IOException {

String line ;

// For each line...
while while (( line = input . readLine ()) != null null ) {

System . out . println ( "line = `" + line + "'" );
final final List < String > list = parse ( line );

System . out . println ( "Found " + list . size () + " items." );
for

for ( String str : list ) {
System . out . print ( str + "," );

}
System . out . println ();

}

}

/** Parse one line.
* @return List of Strings, minus their double quotes
*/
public public List < String > parse ( final final String line ) {

final final List < String > list = new new ArrayList <>();

final final Matcher m = csvRE . matcher ( line );

// For each field
while while ( m . find ()) {

String match = m . group ();
iif ( match == null null ) {

break break ;

}
iif ( match . endsWith ( "," )) { // trim trailing ,
match = match . substring ( 0 , match . length () - 1 );

}
iif ( match . startsWith ( "\"" )) { // must also end with \"
iif (! match . endsWith ( "\"" )) {
throw

throw new new IllegalArgumentException (

"Quoted column missing end quote: " + line );

}
match = match . substring ( 1 , match . length () - 1 );