private int Variable(ref VarType type, ref VarType subType)
{
if (Tokens[currentToken].Type != TokenType.Identifier && Tokens[currentToken].Type != TokenType.DoubleQuoteString && Tokens[currentToken].Type != TokenType.Number)
{
WriteError("Expected Identifier", Tokens[currentToken]);
AdvanceToken();
return(0);
}
int address = 0;
if (symbolTable.Lookup(Tokens[currentToken].Value) == -1)
{
if (Tokens[currentToken].Type == TokenType.DoubleQuoteString)
{
address = assembler.AllocateStaticMemory(Tokens[currentToken].Value);
type = VarType.String;
AdvanceToken();
return(address);
}
if (Tokens[currentToken].Type == TokenType.Number)
{
address = int.Parse(Tokens[currentToken].Value);
type = VarType.Number;
AdvanceToken();
return(address);
}
//variable not found
WriteErrorLine("Undeclared variable '" + Tokens[currentToken].Value + "'", Tokens[currentToken]);
type = VarType.Invalid;
}
else
{
address = symbolTable.Lookup(Tokens[currentToken].Value);
type = symbolTable.GetType(Tokens[currentToken].Value);
}
AdvanceToken();
//loading an array
if (Tokens[currentToken].Type == TokenType.LeftBracket)
{
AdvanceToken();
if (type != VarType.Invalid)
{
if (type != VarType.Array)
{
WriteErrorLine("Variable treated like array but not declared as such", Tokens[currentToken]);
}
else
{
subType = symbolTable.GetArrayType(Tokens[currentToken - 2].Value);
}
}
//else just eat the brackets, no need to error check, already threw an error
VarType ttype = VarType.Invalid;
Expr(0, ref ttype);
if (Tokens[currentToken].Type != TokenType.RightBracket)
{
WriteError("Expected end of array", Tokens[currentToken]);
}
AdvanceToken();
if (ttype != VarType.Int)
{
WriteErrorLine("Expected int for array index", Tokens[currentToken]);
}
//emit some stuff idk
}
return(address);
}
