public Instruction Match(string code)
{
var result = new Instruction();
foreach (var instruction in Instructions)
{
int j = 0;
bool requiredWhitespaceMet = false;
bool match = true;
// Create new result
result.Match = instruction.Match;
result.Value = instruction.Value;
result.Operands = new Dictionary<char, Operand>();
result.ImmediateValues = new Dictionary<char, ImmediateValue>();
for (int i = 0; i < instruction.Match.Length; i++, j++)
{
if (j >= code.Length)
{
match = false;
break;
}
if (instruction.Match[i] == '_') // Required whitespace
{
if (requiredWhitespaceMet && char.IsWhiteSpace(code[j]))
i--;
else if (requiredWhitespaceMet && !char.IsWhiteSpace(code[j]))
{
requiredWhitespaceMet = false;
j--;
}
else
{
if (char.IsWhiteSpace(code[j]))
{
requiredWhitespaceMet = true;
i--;
}
else
{
match = false;
break;
}
}
}
else if (instruction.Match[i] == '-') // Optional whitespace
{
if (char.IsWhiteSpace(code[j]))
i--;
else
j--;
}
else if (instruction.Match[i] == '%') // Immediate value
{
char key = instruction.Match[++i]; i += 2;
string bitString = "";
while (instruction.Match[i] != '>')
bitString += instruction.Match[i++];
i++; int bits = int.Parse(bitString);
// Get value
string value = GetOperandValue(instruction, i, code, j);
if (value == null)
{
match = false;
break;
}
j += value.Length - 1;
result.ImmediateValues.Add(key, new ImmediateValue
{
Bits = bits,
Value = value
});
}
else if (instruction.Match[i] == '^') // Relative immediate value
{
char key = instruction.Match[++i]; i += 2;
string bitString = "";
while (instruction.Match[i] != '>')
bitString += instruction.Match[i++];
i++; int bits = int.Parse(bitString);
// Get value
string value = GetOperandValue(instruction, i, code, j);
if (value == null)
{
match = false;
break;
}
j += value.Length - 1;
result.ImmediateValues.Add(key, new ImmediateValue
{
Bits = bits,
Value = value,
RelativeToPC = true
});
}
else if (instruction.Match[i] == '&') // RST immediate value
{
char key = instruction.Match[++i];
i++;
// Get value
string value = GetOperandValue(instruction, i, code, j);
if (value == null)
{
match = false;
break;
}
j += value.Length - 1;
result.ImmediateValues.Add(key, new ImmediateValue
{
Bits = 8,
Value = value,
RstOnly = true
});
}
else if (instruction.Match[i] == '@')
{
char key = instruction.Match[++i]; i += 2;
string group = "";
while (instruction.Match[i] != '>')
group += instruction.Match[i++];
i++; string value = GetOperandValue(instruction, i, code, j);
if (value == null)
{
match = false;
break;
}
value = value.Trim().ToLower();
j += value.Length - 1;
var operand = GetOperand(OperandGroups[group], value);
if (operand == null)
{
match = false;
break;
}
result.Operands.Add(key, operand);
i--;
}
else
{
if (instruction.Match[i] != char.ToLower(code[j]))
{
match = false;
break;
}
}
}
if (j != code.Length || !match)
continue;
// Match found
return result;
}
return null;
}
private string GetOperandValue(Instruction instruction, int i, string code, int j)
{
// Get the delimiter
char? delimiter = null;
while (i < instruction.Match.Length)
{
if (instruction.Match[i] == '-' || instruction.Match[i] == '_')
i++;
else
{
delimiter = instruction.Match[i];
break;
}
}
if (delimiter == null)
return code.Substring(j);
int index = code.SafeIndexOf(delimiter.Value, j);
if (index == -1)
return null;
return code.Substring(j, index - j);
}