public OperandToken(OperandTokenType type, Boolean isAddressOf,
Boolean isDereference, UInt64 op, UInt32 line, String text)
{
this.type = type;
this.isAddressOf = isAddressOf;
this.isDereference = isDereference;
this.op = op;
this.line = line;
this.text = text;
}
public OperandToken NextOperand()
{
Boolean isAddressOf = false;
ToNextInterestingCharacter();
//
// Make sure you're not at the end of the file
//
if (next < 0)
{
throw FormatError("NextOperand: Unexpected EOF");
}
if ((Char)next == '&')
{
isAddressOf = true;
next = reader.Read();
if (next < 0)
{
throw FormatError("NextOperand: Unexpected EOF");
}
}
OperandTokenType tokenType = OperandTokenType.Label;
String opString = null;
if (next == '-' || (next >= '0' && next <= '9'))
{
tokenType = OperandTokenType.Literal;
stringBuilder.Length = 0;
do
{
stringBuilder.Append((Char)next);
next = reader.Read();
} while (((Char)next >= '0' && (Char)next <= '9') ||
((Char)next >= 'A' && (Char)next <= 'F') ||
((Char)next >= 'a' && (Char)next <= 'f') ||
(Char)next == 'x' || (Char)next == 'b');
if (stringBuilder.Length <= 1 && stringBuilder[0] == '-')
{
throw FormatError("'-' is not a valid operand");
}
opString = stringBuilder.ToString();
}
if (tokenType != OperandTokenType.Literal)
{
//
// Check if it's a Label or a Command
//
if (((Char)next >= 'a' && (Char)next <= 'z') || ((Char)next >= 'A' && (Char)next <= 'Z'))
{
stringBuilder.Length = 0;
do
{
stringBuilder.Append((Char)next);
next = reader.Read();
}while (((Char)next >= 'a' && (Char)next <= 'z') ||
((Char)next >= 'A' && (Char)next <= 'Z') ||
((Char)next >= '0' && (Char)next <= '9'));
if (stringBuilder.Length == 2)
{
if (stringBuilder[1] == 'p')
{
if (stringBuilder[0] == 'f')
{
tokenType = OperandTokenType.FramePointer;
}
else if (stringBuilder[1] == 'd')
{
tokenType = OperandTokenType.DataPointer;
}
}
}
opString = stringBuilder.ToString();
}
else
{
throw FormatError("Expected Operand but could not recognize character '{0}' (0x{1:X}) ({1})", (Char)next, next);
}
}
//
// Check for dereference
//
Boolean isDereference = false;
UInt64 dereferenceOffset = 0;
if (next == '(')
{
isDereference = true;
next = reader.Read();
if (next < 0)
{
throw new FormatException("Expected ')' or '0-9' but got EOF");
}
if (next == ')')
{
next = reader.Read();
return(new OperandToken(tokenType, isAddressOf, true, 0, currentLineNumber, opString));
}
if ((next >= '0' && next <= '9'))
{
stringBuilder.Length = 0;
do
{
stringBuilder.Append((Char)next);
next = reader.Read();
if (next < 0)
{
throw FormatError("Expected ')' but got EOF");
}
} while (next != ')');
next = reader.Read();
// TODO: Need to parse dereference offset
dereferenceOffset = UInt64.Parse(stringBuilder.ToString());
}
else
{
throw FormatError("After '(' expected ')' or '0-9' but got '{0}'", (Char)next);
}
}
if (tokenType == OperandTokenType.Literal)
{
UInt64 literal = UInt64.Parse(opString);
return(isDereference ? new OperandToken(tokenType, isAddressOf, isDereference, literal + dereferenceOffset, currentLineNumber, opString) :
new OperandToken(tokenType, isAddressOf, false, literal, currentLineNumber, opString));
}
return(new OperandToken(tokenType, isAddressOf, isDereference, dereferenceOffset, currentLineNumber, opString));
throw FormatError("NextGlobalToken: Unexpected character '{0}'", (Char)next);
}
