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package f00f.net.irc.martyr.util;
import java.util.NoSuchElementException;
public class CtcpUtil
{
public static final char CTCP_TAG_DELIM = '\001';
/**
* Returns a new string ready for sending via MessageCommand.
*
* @param action Action string to create
* @return Action string ready for sending
*/
public static String makeActionString( String action )
{
return makeCtcpString( "ACTION " + action );
}
public static String makeCtcpString( String s )
{
return "" + CTCP_TAG_DELIM + s + CTCP_TAG_DELIM;
}
/**
* Parses the string into tokens, where each token is either a
* CTCP escaped sequence or not.
*/
public static class CtcpTokenizer
{
private String str;
public CtcpTokenizer( String in )
{
this.str = in;
}
public boolean isNextACtcp()
{
return str.charAt(0) == CTCP_TAG_DELIM;
}
public boolean hasNext()
{
return !str.equals("");
}
public String next()
{
return nextToken();
}
public String nextToken()
{
if( !hasNext() )
{
throw new NoSuchElementException();
}
int pos = str.indexOf( CTCP_TAG_DELIM, 1 );
String result;
if( isNextACtcp() )
{
if( pos < 0 )
{
// Error? Well, whatever, return the rest of the
// string.
result = str.substring( 1 );
str = "";
return result;
}
else
{
// ^Aour string^A(rest of string)
// Lose both ^A
result = str.substring( 1, pos );
str = str.substring( pos + 1 );
return result;
}
}
else
{
// Not a CTCP
if( pos < 0 )
{
result = str;
str = "";
return result;
}
else
{
result = str.substring( 0, pos );
str = str.substring( pos );
return result;
}
}
}
}
}
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