private Factor parseFactor() throws CompileException {
boolean isNegative = false;
while (true) {
switch (currentToken.getTokenKind()) {
case TERMOPERATOR:
if (currentToken.getSpelling().equals("-")) {
acceptIt();
isNegative = true;
break;
} else
throw new CompileException(
ErrorType.UNEXPECTED_TOKEN,
currentToken.getPosition(),
"Unexpected token: " + currentToken.getSpelling());
case LPAREN:
acceptIt();
ArithmeticExpression arithmeticExpression = parseArithmeticExpression();
accept(TokenKind.RPAREN);
return new Factor(arithmeticExpression, isNegative);
case INTLITERAL:
return new Factor(parseNumber(), isNegative);
case IDENTIFIER:
Identifier identifierArea = parseIdentifier();
if (currentToken.getTokenKind() == TokenKind.DOT) {
acceptIt();
return new Factor(identifierArea, parseIdentifier(), parseParameters(), isNegative);
} else {
return new Factor(identifierArea, isNegative);
}
default:
throw new CompileException(
ErrorType.UNEXPECTED_TOKEN,
currentToken.getPosition(),
"Wrong token, in parseFactor: " + currentToken.getTokenKind());
}
}
}
private ExpressionBlock parseExpressionBlock() throws CompileException {
boolean isNegative = false;
while (true) {
switch (currentToken.getTokenKind()) {
case TERMOPERATOR:
if (currentToken.getSpelling().equals("-")) {
acceptIt();
isNegative = true;
break;
} else
throw new CompileException(
ErrorType.UNEXPECTED_TOKEN,
currentToken.getPosition(),
"Unexpected token: " + currentToken.getSpelling());
case IDENTIFIER:
Identifier identifier = parseIdentifier();
if (currentToken.getTokenKind() == TokenKind.DOT) {
acceptIt();
return new ExpressionBlock(
identifier, parseIdentifier(), parseParameters(), isNegative);
} else return new ExpressionBlock(identifier, isNegative);
case STRINGLITERAL:
case INTLITERAL:
case BOOLLITERAL:
return new ExpressionBlock(parseLiteral(), isNegative);
case LPAREN:
acceptIt();
Expression expression = parseExpression();
accept(TokenKind.RPAREN);
return new ExpressionBlock(expression, isNegative);
default:
throw new CompileException(
ErrorType.UNEXPECTED_TOKEN,
currentToken.getPosition(),
"Wrong token, in parseExpressionBlock: " + currentToken.getTokenKind());
}
}
}
private Literal parseLiteral() throws CompileException {
switch (currentToken.getTokenKind()) {
case TERMOPERATOR:
if (currentToken.getSpelling().equals("-")) {
acceptIt();
return new Literal(parseNumber());
}
case INTLITERAL:
return new Literal(parseNumber());
case STRINGLITERAL:
return new Literal(parseString());
case BOOLLITERAL:
return new Literal(parseBoolean());
default:
throw new CompileException(
ErrorType.UNEXPECTED_TOKEN,
currentToken.getPosition(),
"Wrong token, in parseLiteral, got " + currentToken.getTokenKind());
}
}
