// function for finding the type of instruction
static string check_type(string op, ref RTdecoder rtd, ref ITdecoder itd, ref JTdecoder jtd)
{
// checking if the instruction is R type
foreach (KeyValuePair <string, string> item in rtd.instructions)
{
if (op == item.Key)
{
return("r");
}
}
// checking if the instruction is I type
foreach (KeyValuePair <string, string> item in itd.instructions)
{
if (op == item.Key)
{
return("i");
}
}
// checking if the instruction is J type
foreach (KeyValuePair <string, string> item in jtd.instructions)
{
if (op == item.Key)
{
return("j");
}
}
// what about directives? how to find out them?
return("");
}
public string[] decode(string line)
{
RTdecoder rtd = new RTdecoder();
ITdecoder itd = new ITdecoder();
JTdecoder jtd = new JTdecoder();
string[] fields = new string[6];
if (line.Contains("D"))
{
fields = directive_calc(line);
}
else
{
string type = check_type(line.Substring(4, 4), ref rtd, ref itd, ref jtd);
if (type == "r")
{
fields = rtd.calc(line);
}
else if (type == "i")
{
fields = itd.clac(line);
}
else if (type == "j")
{
fields = jtd.calc(line);
}
}
return(fields);
}