private void parseFile(Context ctx)
{
while (!l.eof())
{
if (lookAhead.TokenType == Lexer.TOKEN_DEFINE)
{
accept();
Lexer.Token token = match(Lexer.TOKEN_ID);
match('=');
Expression e = expr();
match(';');
ctx.AddExpression(token.strToken, e);
}
else if (lookAhead.TokenType == Lexer.TOKEN_LET)
{
accept();
Lexer.Token token = match(Lexer.TOKEN_ID);
match('=');
Lexer.Token number = match(Lexer.TOKEN_NUMBER);
match(';');
ctx.AddConstant(token.strToken, number.numToken);
}
else
{
throw UnexpectedToken();
}
}
}
private Lexer.Token match(int Token_type)
{
Lexer.Token retVal = lookAhead;
if (lookAhead.TokenType == Token_type)
{
accept();
}
else
{
throw new Exception(String.Format("Expect {0}, got {1}",
Lexer.GetTokenTypeName(Token_type), Lexer.GetTokenTypeName(lookAhead.TokenType)));
}
return(retVal);
}