/**
* Called by the source whenever it produces a message.
*
* @param message the message.
*/
public void messageReceived(Message message) {
MessageType type = message.getType();
Object body[] = (Object[]) message.getBody();
switch (type) {
case SOURCE_LINE:
{
int lineNumber = (Integer) body[0];
String lineText = (String) body[1];
System.out.println(String.format(SOURCE_LINE_FORMAT, lineNumber, lineText));
break;
}
}
}
public void messageReceived(Message message) {
MessageType type = message.getType();
switch (type) {
case PARSER_SUMMARY:
{
Number body[] = (Number[]) message.getBody();
int statementCount = (Integer) body[0];
int syntaxErrors = (Integer) body[1];
float elapsedTime = (Float) body[2];
System.out.printf(PARSER_SUMMARY_FORMAT, statementCount, syntaxErrors, elapsedTime);
break;
}
case SYNTAX_ERROR:
{
Object body[] = (Object[]) message.getBody();
int lineNumber = (Integer) body[0];
int position = (Integer) body[1];
String tokenText = (String) body[2];
String errorMessage = (String) body[3];
int spaceCount = PREFIX_WIDTH + position;
StringBuilder flagBuffer = new StringBuilder();
// Spaces up to the error position
for (int i = 1; i < spaceCount; ++i) flagBuffer.append(' ');
// A pointer to the error followed by the error message
flagBuffer.append("^\n*** ").append(errorMessage);
// Text, if any, of the bad token
if (tokenText != null) flagBuffer.append(" [at \"").append(tokenText).append("\"]");
System.out.println(flagBuffer.toString());
break;
}
}
}
/**
* Called by the back end whenever it produces a message.
*
* @param message the message.
*/
public void messageReceived(Message message) {
MessageType type = message.getType();
switch (type) {
case SOURCE_LINE:
{
if (lines) {
int lineNumber = (Integer) message.getBody();
System.out.printf(LINE_FORMAT, lineNumber);
}
break;
}
case ASSIGN:
{
if (assign) {
Object body[] = (Object[]) message.getBody();
int lineNumber = (Integer) body[0];
String variableName = (String) body[1];
Object value = body[2];
System.out.printf(ASSIGN_FORMAT, lineNumber, variableName, value);
}
break;
}
case FETCH:
{
if (fetch) {
Object body[] = (Object[]) message.getBody();
int lineNumber = (Integer) body[0];
String variableName = (String) body[1];
Object value = body[2];
System.out.printf(FETCH_FORMAT, lineNumber, variableName, value);
}
break;
}
case CALL:
{
if (call) {
Object body[] = (Object[]) message.getBody();
int lineNumber = (Integer) body[0];
String routineName = (String) body[1];
System.out.printf(CALL_FORMAT, lineNumber, routineName);
}
break;
}
case RETURN:
{
if (returnn) {
Object body[] = (Object[]) message.getBody();
int lineNumber = (Integer) body[0];
String routineName = (String) body[1];
System.out.printf(RETURN_FORMAT, lineNumber, routineName);
}
break;
}
case RUNTIME_ERROR:
{
Object body[] = (Object[]) message.getBody();
String errorMessage = (String) body[0];
Integer lineNumber = (Integer) body[1];
System.out.print("*** RUNTIME ERROR");
if (lineNumber != null)
System.out.print(" AT LINE " + String.format("%03d", lineNumber));
System.out.println(": " + errorMessage);
break;
}
case INTERPRETER_SUMMARY:
{
Number body[] = (Number[]) message.getBody();
int executionCount = (Integer) body[0];
int runtimeErrors = (Integer) body[1];
float elapsedTime = (Float) body[2];
System.out.printf(
INTERPRETER_SUMMARY_FORMAT, executionCount, runtimeErrors, elapsedTime);
break;
}
case COMPILER_SUMMARY:
{
Number body[] = (Number[]) message.getBody();
int instructionCount = (Integer) body[0];
float elapsedTime = (Float) body[1];
System.out.printf(COMPILER_SUMMARY_FORMAT, instructionCount, elapsedTime);
break;
}
}
}