{–}
{ Branch Unconditional }
procedure Branch(L: string);
begin
EmitLn('BRA ' + L);
end;
{–}
{ Branch False }
procedure BranchFalse(L: string);
begin
EmitLn('TST D0');
EmitLn('BEQ ' + L);
end;
{–}
{ Read Variable to Primary Register }
procedure ReadVar;
begin
EmitLn('BSR READ');
Store(Value[1]);
end;
{ Write Variable from Primary Register }
procedure WriteVar;
begin
EmitLn('BSR WRITE');
end;
{–}
{ Write Header Info }
procedure Header;
begin
WriteLn('WARMST', TAB, 'EQU $A01E');
end;
{–}
{ Write the Prolog }
procedure Prolog;
begin
PostLabel('MAIN');
end;
{–}
{ Write the Epilog }
procedure Epilog;
begin
EmitLn('DC WARMST');
EmitLn('END MAIN');
end;
{–}
{ Parse and Translate a Math Factor }
procedure BoolExpression; Forward;
procedure Factor;
begin
if Look = '(' then begin
Match('(');
BoolExpression;
Match(')');
end
else if IsAlpha(Look) then begin
GetName;
LoadVar(Value);
end
else
LoadConst(GetNum);
end;
{–}
{ Parse and Translate a Negative Factor }
procedure NegFactor;
begin
Match('-');
if IsDigit(Look) then
LoadConst(-GetNum)
else begin
Factor;
Negate;
end;
end;
{–}
{ Parse and Translate a Leading Factor }
procedure FirstFactor;
begin
case Look of
'+': begin
Match('+');
Factor;
end;
'-': NegFactor;
else Factor;
end;
end;
{–}
{ Recognize and Translate a Multiply }
