PatternConverter parse()

in src/main/java/org/apache/log4j/helpers/PatternParser.java [131:227]
92 lines of code
24 McCabe index (conditional complexity)

  PatternConverter parse() {
    char c;
    i = 0;
    while(i < patternLength) {
      c = pattern.charAt(i++);
      switch(state) {
      case LITERAL_STATE:
        // In literal state, the last char is always a literal.
        if(i == patternLength) {
          currentLiteral.append(c);
          continue;
        }
        if(c == ESCAPE_CHAR) {
          // peek at the next char.
          switch(pattern.charAt(i)) {
          case ESCAPE_CHAR:
            currentLiteral.append(c);
            i++; // move pointer
            break;
          case 'n':
            currentLiteral.append(Layout.LINE_SEP);
            i++; // move pointer
            break;
          default:
            if(currentLiteral.length() != 0) {
              addToList(new LiteralPatternConverter(
                                                  currentLiteral.toString()));
              //LogLog.debug("Parsed LITERAL converter: \""
              //           +currentLiteral+"\".");
            }
            currentLiteral.setLength(0);
            currentLiteral.append(c); // append %
            state = CONVERTER_STATE;
            formattingInfo.reset();
          }
        }
        else {
          currentLiteral.append(c);
        }
        break;
      case CONVERTER_STATE:
	currentLiteral.append(c);
	switch(c) {
	case '-':
	  formattingInfo.leftAlign = true;
	  break;
	case '.':
	  state = DOT_STATE;
	  break;
	default:
	  if(c >= '0' && c <= '9') {
	    formattingInfo.min = c - '0';
	    state = MIN_STATE;
	  }
	  else
	    finalizeConverter(c);
	} // switch
	break;
      case MIN_STATE:
	currentLiteral.append(c);
	if(c >= '0' && c <= '9')
	  formattingInfo.min = formattingInfo.min*10 + (c - '0');
	else if(c == '.')
	  state = DOT_STATE;
	else {
	  finalizeConverter(c);
	}
	break;
      case DOT_STATE:
	currentLiteral.append(c);
	if(c >= '0' && c <= '9') {
	  formattingInfo.max = c - '0';
	   state = MAX_STATE;
	}
	else {
	  LogLog.error("Error occured in position "+i
		     +".\n Was expecting digit, instead got char \""+c+"\".");
	  state = LITERAL_STATE;
	}
	break;
      case MAX_STATE:
	currentLiteral.append(c);
	if(c >= '0' && c <= '9')
	  formattingInfo.max = formattingInfo.max*10 + (c - '0');
	else {
	  finalizeConverter(c);
	  state = LITERAL_STATE;
	}
	break;
      } // switch
    } // while
    if(currentLiteral.length() != 0) {
      addToList(new LiteralPatternConverter(currentLiteral.toString()));
      //LogLog.debug("Parsed LITERAL converter: \""+currentLiteral+"\".");
    }
    return head;
  }