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| unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Edit1: TEdit;
Label1: TLabel;
Button1: TButton;
Label2: TLabel;
procedure Button1Click(Sender: TObject);
procedure Edit1Change(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
S:string='';
ind,pn,Dli,Ind2,PrSc,LvSc:integer;
s2,s1,s3,s4,W1:string;
Fl:boolean;
implementation
{$R *.dfm}
function Filter(h:string):string;
begin
h:=StringReplace(h,'not','/',[rfReplaceAll,rfIgnoreCase]);
h:=StringReplace(h,'and','^',[rfReplaceAll,rfIgnoreCase]);
h:=StringReplace(h,'or','|',[rfReplaceAll,rfIgnoreCase]);
result:=h;
end;
function ChrToBool(h:char):boolean;
begin
if h in['T','t'] then result:=true
else result:=false;
end;
function BoolToStr(h:boolean):char;
begin
if h then result:='T'
else result:='F';
end;
function LogAnswer(h:string):boolean;
var
First,second,redy:boolean;
i,j1,j2:integer;
begin
while pos('(',h)<>0 do
begin
redy:=false;
for i:=1 to length(h)do
begin
if redy then continue;
case h[i] of
'(':j1:=i;
')':begin
j2:=i;
redy:=true;
end;
end;
end;
h:=copy(h,1,j1-1)+BoolToStr(LogAnswer(copy(h,j1+1,j2-j1-1)))+copy(h,j2+1,length(h)-j2+1);
end;
while pos('/',h)<>0 do
begin
i:=pos('/',h);
if h[i+1]in['t','T'] then first:=False
else first:=True;
h:=copy(h,1,i-1)+BoolToStr(first)+copy(h,i+2,length(h)-i+2);
end;
while pos('^',h)<>0 do
begin
i:=pos('^',h);
first:=ChrToBool(h[i-1]);
second:=ChrToBool(h[i+1]);
first:=first and second;
h:=copy(h,1,i-2)+BoolToStr(first)+copy(h,i+2,length(h)-i+2);
end;
while pos('|',h)<>0 do
begin
i:=pos('|',h);
first:=ChrToBool(h[i-1]);
second:=ChrToBool(h[i+1]);
first:=first or second;
h:=copy(h,1,i-2)+BoolToStr(first)+copy(h,i+2,length(h)-i+2);
end;
result:=ChrToBool(h[1]);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
s:=edit1.Text;
Dli:=length(s) ;
PrSc:=0;
LvSc:=0;
Fl:=true;
for Ind2:=1 to Dli do
begin
if s[Ind2]='(' then PrSC:=PrSc+1;
if s[Ind2]=')' then LvSc:=LvSc+1;
end;
if PrSc > LvSc then begin label2.Caption:='=Nexvataet ZakriV Scobki' ; Fl:=false ; end;
if PrSc < LvSc then begin label2.Caption:='=Nexvataet OtkrV Scobki' ; Fl:=false; end;
if Fl<>false then
begin
while (Dli<>1) and (Dli<>4) and (Dli<>7) and (Dli<>8) do
begin
Dli:=length(s);
for ind:=1 to Dli do
begin
If s[ind]=')' then
begin
PN:=Ind;
break;
end;
end;
if s[Pn-2] ='(' then
begin
W1:='Not'+s[pn-1];
if LogAnswer(filter(W1))
then
begin
s[pn-5]:='T';
s3:=copy(s,1,Pn-5);
s4:=copy(s,pn+1,dli);
s:=s3+s4;
Dli:=length(s);
end
else
begin
s[pn-5]:='F';
s3:=copy(s,1,pn-5);
s4:=copy(s,pn+1,dli);
s:=s3+s4;
dli:=length(s);
end;
end
else //else1 Esli ne Not
begin //else 1.1
if s[pn-5]='r'
then
begin//then2.1
W1:=s[pn-3]+'or'+s[pn-1];
if LogAnswer(filter(W1))
then//then2.2
begin//then2.2
s[pn-6]:='T';
s3:=copy(s,1,pn-6);
s4:=copy(s,pn+1,dli);
s:=s3+s4;
Dli:=length(s);
end//then2.2
else//else2.2
begin//else2.2
s[pn-6]:='F';
s3:=copy(s,1,pn-6);
s4:=copy(s,pn+1,dli);
s:=s3+s4;
Dli:=length(s);
end; //else2.2
end//then2.1
else//else2.1
begin//else2.2
W1:=s[pn-3]+'and'+s[pn-1];
if LogAnswer(filter(W1))
then//then2.3
begin//then2.3
s[pn-7]:='T';
s3:=copy(s,1,pn-7);
s4:=copy(s,pn+1,dli);
s:=s3+s4;
Dli:=length(s);
end//then2.3
else//else2.3
begin//else2.3
s[pn-7]:='F';
s3:=copy(s,1,pn-7);
s4:=copy(s,pn+1,dli);
s:=s3+s4;
Dli:=length(s);
end;//else2.3
end;//else2.2
end; //End Else 1.1
Dli:=length(s);
end; //while
case Dli of
1:begin//1
if LogAnswer(filter(s)) then label2.caption:='=True'
else label2.caption:='=False';
end;//1
6:begin//6
if LogAnswer(filter(s)) then label2.caption:='=True'
else label2.caption:='=False';
end;//6
7:begin//7
s1:=s[4]+'or'+s[6];
if LogAnswer(filter(s1)) then label2.caption:='=True'
else label2.caption:='=False';
end;//7
8:begin//8
s2:=s[5]+'and'+s[7];
if LogAnswer(filter(s2)) then label2.caption:='=True'
else label2.caption:='=False';
end;//8
end;
end;
end;
procedure TForm1.Edit1Change(Sender: TObject);
begin
label2.Caption:='=';
end;
end. |
(
