private void startBtn_Click(object sender, RoutedEventArgs e)
{
saveBtn_Click(null, null);
string text = new TextRange(codeEditor.Document.ContentStart, codeEditor.Document.ContentEnd).Text;
errorBox.Text = "";
try
{
var Instructions = AssemblerSpecs.Assemble(text);
output.ItemsSource = Instructions;
using (var fs = new FileStream(codeFile.Replace(".asm", ".hack"), FileMode.OpenOrCreate & FileMode.Truncate, FileAccess.Write))
{
using (StreamWriter streamWriter = new StreamWriter(fs))
{
foreach (var i in Instructions)
{
streamWriter.WriteLine(i);
}
streamWriter.Flush();
}
}
}
catch (Exception ex)
{
errorBox.Text = ex.Message;
}
}
public static List <string> Assemble(string Text)
{
var HackCode = new List <string>();
var Instructions = AssemblerSpecs.CleanCode(Text);
var SymbolTable = new Dictionary <string, int>(AssemblerSpecs.PreSymbols);
for (int i = 0; i < Instructions.Count; i++)
{
var instruction = Instructions[i].instruction;
var instructionLNo = Instructions[i].linenumber;
if (instruction.StartsWith("("))
{
var label = instruction?.Replace("(", "")?.Replace(")", "")?.Trim();
if (string.IsNullOrEmpty(label))
{
throw new Exception("Invalid Label at line " + instructionLNo + 1);
}
SymbolTable.Add(label, i);
Instructions.RemoveAt(i--);
}
}
int lastVar = 16;
for (int i = 0; i < Instructions.Count; i++)
{
var instruction = Instructions[i].instruction;
var instructionLNo = Instructions[i].linenumber;
if (instruction.StartsWith("@"))
{
var label = instruction?.Replace("@", "")?.Trim();
if (string.IsNullOrEmpty(label))
{
throw new Exception("Invalid address at line " + (instructionLNo + 1));
}
int address = 0;
if (int.TryParse(label, out address))
{
continue;
}
if (SymbolTable.ContainsKey(label))
{
address = SymbolTable[label];
}
else
{
SymbolTable[label] = lastVar++;
address = SymbolTable[label];
}
}
}
for (int i = 0; i < Instructions.Count; i++)
{
var instruction = Instructions[i].instruction;
var instructionLNo = Instructions[i].linenumber;
try
{
if (instruction.StartsWith("@"))
{
var label = instruction?.Replace("@", "")?.Trim();
int address;
if (!int.TryParse(label, out address))
{
if (SymbolTable.ContainsKey(label))
{
address = SymbolTable[label];
}
else
{
throw new Exception("'" + label + "' label not found at line number " + instructionLNo);
}
}
char[] hack = new char[16] {
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0'
};
var stringAddres = Convert.ToString(address, 2);
for (int j = 16 - stringAddres.Length; j < 16; j++)
{
hack[j] = stringAddres[j - (16 - stringAddres.Length)];
}
HackCode.Add(new string(hack));
}
else
{
string dest = "null";
string comp = "";
string jump = "null";
if (instruction.Contains(';') && instruction.Contains('='))
{
var split_destAndOther = instruction.Split('=');
var split_compAndJump = split_destAndOther[1].Split(';');
dest = split_destAndOther[0];
comp = split_compAndJump[0];
jump = split_compAndJump[1];
}
else if (instruction.Contains(';'))
{
var splited = instruction.Split(';');
comp = splited[0];
jump = splited[1];
}
else if (instruction.Contains('='))
{
var splited = instruction.Split('=');
dest = splited[0];
comp = splited[1];
}
else
{
throw new Exception("Invalid instruction line at " + instructionLNo);
}
var hack = "111" + COMP[comp] + DEST[dest] + JUMP[jump];
HackCode.Add(hack);
}
}
catch (Exception ex)
{
throw new Exception(ex.Message + " line at " + instructionLNo);
}
}
return(HackCode);
}