public override string go()
{
string register = "cx";
string loop = "";
string label = "LOOP" + root.loopCount.ToString() + ":";
int loopCountQ = root.loopCount++;
string header = label;
Assignment a=new Assignment(this.parent);
string assignment =a.go() ;
header+= "\tmov "+register+"," + a.indetifier.Data+"\n";
Lexems.Lexema l = getToken();
if (l == null || l.GetType().Name != "To")
{
addError(new ToKeyWordMissed(), 0);
if (l != null) this.lexems.Add(l);
}
while ((l = getToken()) != null)
{
this.lexems.Add(l);
}
int position = m_tokenPosition;
Expression e = new Expression(this);
string expression=e.go();
string condition = "\txor "+register+"," + e.result +"\n\tdec "+e.result+ "\n\tjnz " + label+"\n";
m_tokenPosition = position;
loop += ";----------Begin loop " + (loopCountQ).ToString() + "----------------\n";
loop += assignment+"\n";
loop += expression;
loop += header;
loop += "\t\tpush "+register+"\n";
loop += "\t\tpush " + e.result + "\n";
loop += e.calculations;
loop += "\t\tpop "+register+"\n";
loop += "\t\tpop " + e.result + "\n";
loop += condition;
loop += ";----------End loop " + (loopCountQ ).ToString() + "----------------\n";
return loop;
}
public override string go()
{
string s = "";
Lexems.Lexema l = getToken();
string type = "";
if (l != null)
{
type = l.GetType().Name;
}
else
{
return null;
}
switch (type)
{
case "Identifire":
{
wasIndetifier = true;
if (hasId(l.Data))
{
indetifier.Data = l.Data;
}
else
{
addError(new UndefindedIndefier(l.Data), 0); ;
}
Lexems.Lexema lt = null;
while ((lt = getToken()) != null && lt.GetType().Name != "Endl")
{
this.lexems.Add(lt);
}
if (lt == null)
{
addError(new EndlMissedError(), 0);
}
Assignment a=new Assignment(this);
a.indetifier = this.indetifier;
a.wasIndetifier = true;
string ass = a.go();
if (ass != null)
{
s += ass;
}
}
break;
case "BinOperEqual":
{
if (wasIndetifier)
{
s += "\tmov " + indetifier.Data + ",ax";
}
else
{
addError(new IndetifierMissedError(), 0);
}
Lexems.Lexema lt = null;
while ((lt = getToken()) != null && lt.GetType().Name != "Endl")
{
this.lexems.Add(lt);
}
if (lt == null&&!wasIndetifier)
{
addError(new EndlMissedError(), 0);
}
Expression e=new Expression(this);
string result = e.go();
if (result != null)
{
s = result + "\tmov ax," + e.result + "\n" + s;
}
}
break;
case "For":
if (wasIndetifier)
{
addError(new UnexpectedIndefier(this.indetifier.Data), 0);
}
return new ForTo(this.parent).go();
/* case "Print":
if (wasIndetifier)
{
addError(new UnexpectedIndefier(this.indetifier.Data), 0);
}
return new Print(this.parent).go();
*/
default:
{
if (wasIndetifier)
{
this.lexems.Insert(0, indetifier);
}
Lexems.Lexema lt = null;
while ((lt = getToken()) != null && lt.GetType().Name != "Endl")
{
this.lexems.Add(lt);
}
if (lt == null)
{
addError(new EndlMissedError(), 0);
}
Expression e = new Expression(this);
string result = e.go();
if (result != null)
{
s = result;
}
}
break;
}
return s;
}