@Override
public void outAConcat(AConcat node) {
AUnExp[] unExps = (AUnExp[]) node.getUnExps().toArray(new AUnExp[0]);
if (unExps.length == 0) {
setOut(node, new NFA());
} else if (unExps.length == 1) {
setOut(node, getOut(unExps[0]));
// free memory
if (getOut(unExps[0]) != null) setOut(unExps[0], null);
} else {
NFA result = null;
for (int i = unExps.length - 1; i >= 0; i--) {
Object o = getOut(unExps[i]);
NFA nfa = (o instanceof NFA) ? (NFA) o : new NFA((CharSet) o);
if (result == null) {
result = nfa;
} else {
result = nfa.concatenate(result);
}
// free memory
if (getOut(unExps[i]) != null) setOut(unExps[i], null);
}
setOut(node, result);
}
}
@Override
public void outARegExp(ARegExp node) {
AConcat[] concats = (AConcat[]) node.getConcats().toArray(new AConcat[0]);
NFA result = null;
if (concats.length > 1) {
for (int i = concats.length - 1; i >= 0; i--) {
Object o = getOut(concats[i]);
NFA nfa = (o instanceof NFA) ? (NFA) o : new NFA((CharSet) o);
if (result == null) {
result = nfa;
} else {
result = nfa.alternate(result);
}
// free memory
if (getOut(concats[i]) != null) setOut(concats[i], null);
}
setOut(node, result);
} else if (concats.length == 1) {
setOut(node, getOut(concats[0]));
// free memory
if (getOut(concats[0]) != null) setOut(concats[0], null);
}
}
@Override
public void outATokens(ATokens node) {
ATokenDef[] tokenDefs = (ATokenDef[]) node.getTokenDefs().toArray(new ATokenDef[0]);
NFA result = null;
for (int i = tokenDefs.length - 1; i >= 0; i--) {
NFA nfa = (NFA) getOut(tokenDefs[i]);
if (nfa != null) {
if (result == null) {
result = nfa;
} else {
result = nfa.merge(result);
}
// free memory
if (getOut(tokenDefs[i]) != null) setOut(tokenDefs[i], null);
}
}
if (result != null) setOut(node, result);
}
@Override
public void outAUnExp(AUnExp node) {
Object o = getOut(node.getBasic());
char c = ' ';
if (node.getUnOp() != null) c = ((Character) getOut(node.getUnOp())).charValue();
switch (c) {
case '*':
{
NFA n = (o instanceof NFA) ? (NFA) o : new NFA((CharSet) o);
setOut(node, n.zeroOrMore());
}
break;
case '?':
{
NFA n = (o instanceof NFA) ? (NFA) o : new NFA((CharSet) o);
setOut(node, n.zeroOrOne());
}
break;
case '+':
{
NFA n = (o instanceof NFA) ? (NFA) o : new NFA((CharSet) o);
setOut(node, n.oneOrMore());
}
break;
default:
{
setOut(node, o);
}
break;
}
// free memory
if (getOut(node.getBasic()) != null) setOut(node.getBasic(), null);
if (getOut(node.getUnOp()) != null) setOut(node.getUnOp(), null);
}
/**
* Generates a scanner for the specified input file.
*
* @param inputFile a file containing a lexical specification to generate a scanner for.
*/
public static void generate(File inputFile) {
Out.resetCounters();
Timer totalTime = new Timer();
Timer time = new Timer();
LexScan scanner = null;
LexParse parser = null;
FileReader inputReader = null;
totalTime.start();
try {
Out.println(ErrorMessages.READING, inputFile.toString());
inputReader = new FileReader(inputFile);
scanner = new LexScan(inputReader);
scanner.setFile(inputFile);
parser = new LexParse(scanner);
} catch (FileNotFoundException e) {
Out.error(ErrorMessages.CANNOT_OPEN, inputFile.toString());
throw new GeneratorException();
}
try {
NFA nfa = (NFA) parser.parse().value;
Out.checkErrors();
if (Options.dump) Out.dump(ErrorMessages.get(ErrorMessages.NFA_IS) + Out.NL + nfa + Out.NL);
if (Options.dot) nfa.writeDot(Emitter.normalize("nfa.dot", null)); // $NON-NLS-1$
Out.println(ErrorMessages.NFA_STATES, nfa.numStates);
time.start();
DFA dfa = nfa.getDFA();
time.stop();
Out.time(ErrorMessages.DFA_TOOK, time);
dfa.checkActions(scanner, parser);
nfa = null;
if (Options.dump) Out.dump(ErrorMessages.get(ErrorMessages.DFA_IS) + Out.NL + dfa + Out.NL);
if (Options.dot) dfa.writeDot(Emitter.normalize("dfa-big.dot", null)); // $NON-NLS-1$
Out.checkErrors();
time.start();
dfa.minimize();
time.stop();
Out.time(ErrorMessages.MIN_TOOK, time);
if (Options.dump) Out.dump(ErrorMessages.get(ErrorMessages.MIN_DFA_IS) + Out.NL + dfa);
if (Options.dot) dfa.writeDot(Emitter.normalize("dfa-min.dot", null)); // $NON-NLS-1$
time.start();
Emitter e = new Emitter(inputFile, parser, dfa);
e.emit();
time.stop();
Out.time(ErrorMessages.WRITE_TOOK, time);
totalTime.stop();
Out.time(ErrorMessages.TOTAL_TIME, totalTime);
} catch (ScannerException e) {
Out.error(e.file, e.message, e.line, e.column);
throw new GeneratorException();
} catch (MacroException e) {
Out.error(e.getMessage());
throw new GeneratorException();
} catch (IOException e) {
Out.error(ErrorMessages.IO_ERROR, e.toString());
throw new GeneratorException();
} catch (OutOfMemoryError e) {
Out.error(ErrorMessages.OUT_OF_MEMORY);
throw new GeneratorException();
} catch (GeneratorException e) {
throw new GeneratorException();
} catch (Exception e) {
e.printStackTrace();
throw new GeneratorException();
}
}
// Calculates the start state of the DFA
private void findStart(NFA nfa) {
DFAState dummy = new DFAState("", false, new HashSet<State>(), new HashMap<String, DFAState>());
dummy.addState(nfa.getStart());
start = closure(dummy);
}