private ZealCpuDriver(ICharStream antlrInputStream)
{
_lexer = new ZealCpuLexer(antlrInputStream);
_tokenStream = new CommonTokenStream(_lexer);
_parser = new ZealCpuParser(_tokenStream);
_parser.RemoveErrorListeners();
_parser.AddErrorListener(new CpuErrorListener(this));
}
private ZealCpuDriver(ICharStream antlrInputStream)
{
_lexer = new ZealCpuLexer(antlrInputStream);
_tokenStream = new CommonTokenStream(_lexer);
_parser = new ZealCpuParser(_tokenStream);
_parser.RemoveErrorListeners();
_parser.AddErrorListener(new CpuErrorListener(this));
}
private int parseNumberLiteral(ZealCpuParser.NumberLiteralContext context)
{
return parseNumberArgument(context).Number;
}
private NumberInstructionArgument parseNumberArgument(ZealCpuParser.NumberLiteralContext context)
{
int result = 0;
ArgumentSize size = ArgumentSize.Byte;
switch (context.Start.Type)
{
case ZealCpuParser.HEX_LITERAL:
{
string hexText = context.HEX_LITERAL().GetText().Substring(1);
if (Int32.TryParse(hexText, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out result))
{
if (hexText.Length > 4 && hexText.Length <= 6)
{
size = ArgumentSize.LongWord;
}
else if (hexText.Length > 2 && hexText.Length <= 4)
{
size = ArgumentSize.Word;
}
}
break;
}
case ZealCpuParser.INTEGER_LITERAL:
if (Int32.TryParse(context.INTEGER_LITERAL().GetText(), out result))
{
if (result > ushort.MaxValue)
{
size = ArgumentSize.LongWord;
}
else if (result > byte.MaxValue)
{
size = ArgumentSize.Word;
}
}
break;
case ZealCpuParser.BINARY_LITERAL:
{
string binaryLiteral = context.BINARY_LITERAL().GetText().Substring(1);
int stringLength = binaryLiteral.Length - 1;
for (int i = 0; i <= stringLength; ++i)
{
if (binaryLiteral[stringLength - i] == '1')
{
result |= (1 << i);
}
}
if (binaryLiteral.Length > 16 && binaryLiteral.Length <= 24)
{
size = ArgumentSize.LongWord;
}
else if (binaryLiteral.Length > 8 && binaryLiteral.Length <= 16)
{
size = ArgumentSize.Word;
}
break;
}
}
return new NumberInstructionArgument(result, size);
}
