IntegerNode * ParserClass::Integer() {
TokenClass tc = Match(INTEGER_TOKEN);
string s = tc.GetLexeme();
const char *c = s.c_str();
IntegerNode *i = new IntegerNode(atoi(c));
return i;
}
// Verify that the next token in the input file is of the same type
// that the parser expects.
TokenClass ParserClass::Match(TokenType expectedType)
{
TokenClass currentToken = this->mScanner->GetNextToken();
if (currentToken.GetTokenType() != expectedType)
{
std::cerr << "Error in ParserClass::Match. " << std::endl;
std::cerr << "Expected token type " <<
TokenClass::GetTokenTypeName(expectedType) <<
", but got type " << currentToken.GetTokenTypeName() <<
std::endl;
exit(1);
}
MSG("\tSuccessfully matched Token Type: " << currentToken.GetTokenTypeName() << ". Lexeme: \"" <<
currentToken.GetLexeme() << "\"");
return currentToken; // the one we just processed
}
IdentifierNode * ParserClass::Identifier() {
TokenClass token = Match(IDENTIFIER_TOKEN);
IdentifierNode *in = new IdentifierNode(token.GetLexeme(), mSymbolTable);
return in;
}
IntegerNode * ParserClass::Integer()
{
TokenClass token = this->Match(INTEGER_TOKEN);
IntegerNode * in = new IntegerNode(std::atoi(token.GetLexeme().c_str()));
return in;
}