private void expect(int type)
{
lastToken = ts.advance();
if (lastToken.type != type)
{
throw new Exception("Expected type " + token2str[type] + " but received type " + token2str[lastToken.type]);
}
}
public virtual PToken advance()
{
PToken ans = nextToken;
if (tokenTrace)
{
Console.WriteLine(ans.ToString());
}
// Call yylex to get the next token for use by peek()
var type = scanner.yylex();
if (type == 7 || type == 8 || type == 9) // These are token classes (identifiers and numbers),
// text of token is needed for semantics
{
nextToken = new PToken(type, scanner.yytext);
}
else
{
nextToken = new PToken(type);
}
return(ans);
}