private SymTabEntry parseRoutineName(Token token, String dummyName) throws Exception {
SymTabEntry routineId = null;
// Parse the routine name identifier.
if (token.getType() == IDENTIFIER) {
String routineName = token.getText().toLowerCase();
routineId = symTabStack.lookupLocal(routineName);
// Not already defined locally: Enter into the local symbol table.
if (routineId == null) {
routineId = symTabStack.enterLocal(routineName);
routineId.appendLineNumber(token.getLineNumber());
}
// If already defined, it should be a forward definition.
else {
routineId = null;
errorHandler.flag(token, IDENTIFIER_REDEFINED, this);
}
token = nextToken(); // consume routine name identifier
} else {
errorHandler.flag(token, MISSING_IDENTIFIER, this);
}
// If necessary, create a dummy routine name symbol table entry.
if (routineId == null) {
routineId = symTabStack.enterLocal(dummyName);
}
return routineId;
}
protected void parseFormalParameters(Token token, SymTabEntry routineId) throws Exception {
// Parse the formal parameters if there is an opening left parenthesis.
token = synchronize(LEFT_PAREN_SET);
if (token.getType() == LEFT_PAREN) {
token = nextToken(); // consume (
TokenType tokenType1 = token.getType();
ArrayList<SymTabEntry> parms = new ArrayList<SymTabEntry>();
while (tokenType1 != RIGHT_PAREN) {
parms.addAll(parseParmSublist(token, routineId));
token = currentToken();
tokenType1 = token.getType();
}
// This sync needs to check for Int or Char
token = synchronize(PARAMETER_SET);
// Closing right parenthesis.
if (token.getType() == RIGHT_PAREN) {
token = nextToken(); // consume )
} else {
errorHandler.flag(token, MISSING_RIGHT_PAREN, this);
}
routineId.setAttribute(ROUTINE_PARMS, parms);
}
}
private ArrayList<SymTabEntry> parseParmSublist(Token token, SymTabEntry routineId)
throws Exception {
// name = main, definition == function
Definition parmDefn = null;
TokenType tokenType = token.getType();
parmDefn = VALUE_PARM;
SymTabEntry sublist = null;
if (tokenType == INT) {
IntDeclarationsParser intDeclarationsParser = new IntDeclarationsParser(this);
intDeclarationsParser.setDefinition(parmDefn);
token = nextToken();
sublist = intDeclarationsParser.parseIdentifier(token);
sublist.setTypeSpec(integerType);
} else if (tokenType == CHAR) {
IntDeclarationsParser intDeclarationsParser = new IntDeclarationsParser(this);
intDeclarationsParser.setDefinition(parmDefn);
token = nextToken();
sublist = intDeclarationsParser.parseIdentifier(token);
sublist.setTypeSpec(charType);
}
token = nextToken();
token = currentToken();
if (token.getType() == COMMA) {
token = nextToken();
}
tokenType = token.getType();
token = synchronize(PARAMETER_SET);
ArrayList<SymTabEntry> SC = new ArrayList<SymTabEntry>();
SC.add(sublist);
return SC;
}
public SymTabEntry parse(Token token, SymTabEntry parentId) throws Exception {
Token FunctionReturnToken = token;
Definition routineDefn = null;
String dummyName = null;
SymTabEntry routineId = null;
TokenType routineType = token.getType();
// Initialize.
switch ((WookieTokenType) routineType) {
case INT:
{
// save the int data type for use later
FunctionReturnToken = token;
token = nextToken(); // consume Int
routineDefn = DefinitionImpl.FUNCTION;
dummyName = "DummyProgramName".toLowerCase() + String.format("%03d", ++dummyCounter);
break;
}
case CHAR:
{
// save the char data type for use later
FunctionReturnToken = token;
token = nextToken(); // consume Char
routineDefn = DefinitionImpl.FUNCTION;
dummyName = "DummyProgramName".toLowerCase() + String.format("%03d", ++dummyCounter);
break;
}
case VOID:
{
// save the void data type for use later
FunctionReturnToken = token;
token = nextToken(); // consume PROGRAM
routineDefn = DefinitionImpl.PROCEDURE;
dummyName = "DummyProgramName".toLowerCase() + String.format("%03d", ++dummyCounter);
break;
}
default:
{
routineDefn = DefinitionImpl.PROGRAM;
dummyName = "DummyProgramName".toLowerCase();
break;
}
}
// Parse the routine name.
routineId = parseRoutineName(token, dummyName);
routineId.setDefinition(routineDefn);
token = currentToken();
// Create new intermediate code for the routine.
ICode iCode = ICodeFactory.createICode();
routineId.setAttribute(ROUTINE_ICODE, iCode);
routineId.setAttribute(ROUTINE_ROUTINES, new ArrayList<SymTabEntry>());
SymTab symTab = symTabStack.push();
routineId.setAttribute(ROUTINE_SYMTAB, symTab);
((SymTabImpl) symTab).setfuncName(routineId.getName());
parseFormalParameters(token, routineId);
token = currentToken();
if (FunctionReturnToken.getType() == INT) {
routineId.setTypeSpec(integerType);
} else if (FunctionReturnToken.getType() == CHAR) {
routineId.setTypeSpec(charType);
}
// Parse the routine's block declaration.
if (token.getType() == LEFT_BRACE) {
routineId.setAttribute(ROUTINE_CODE, DECLARED);
BlockParser blockParser = new BlockParser(this);
ICodeNode rootNode = blockParser.parse(token, routineId);
iCode.setRoot(rootNode);
}
ArrayList<SymTabEntry> subroutines =
(ArrayList<SymTabEntry>) parentId.getAttribute(ROUTINE_ROUTINES);
subroutines.add(routineId);
// Pop the routine's symbol table off the stack.
symTabStack.pop();
return routineId;
}