begin
Scan;
while not(Token in ['e', 'l']) do begin
case Token of
'i': DoIf;
'w': DoWhile;
'R': DoRead;
'W': DoWrite;
else Assignment;
end;
Scan;
end;
end;
{–}
{ Allocate Storage for a Variable }
procedure Alloc(N: Symbol);
begin
if InTable(N) then Abort('Duplicate Variable Name ' + N);
AddEntry(N, 'v');
Write(N, ':', TAB, 'DC ');
if Look = '=' then begin
Match('=');
If Look = '-' then begin
Write(Look);
Match('-');
end;
WriteLn(GetNum);
end
else
WriteLn('0');
end;
{–}
{ Parse and Translate a Data Declaration }
procedure Decl;
begin
GetName;
Alloc(Value);
while Look = ',' do begin
Match(',');
GetName;
Alloc(Value);
end;
end;
{–}
{ Parse and Translate Global Declarations }
procedure TopDecls;
begin
Scan;
while Token <> 'b' do begin
case Token of
'v': Decl;
else Abort('Unrecognized Keyword ' + Value);
end;
Scan;
end;
end;
{–}
{ Parse and Translate a Main Program }
procedure Main;
begin
MatchString('BEGIN');
Prolog;
Block;
MatchString('END');
Epilog;
end;
{–}
{ Parse and Translate a Program }
procedure Prog;
begin
MatchString('PROGRAM');
Header;
TopDecls;
Main;
Match('.');
end;
{–}
{ Initialize }
procedure Init;
var i: integer;
begin
for i := 1 to MaxEntry do begin
ST[i] := '';
SType[i] := ' ';
end;
GetChar;
Scan;
end;
{–}
{ Main Program }
begin
Init;
