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unit fileunit;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Math;
type
tInputfile = class
private
zeile: longint;
zeilen: tStringlist;
public
procedure anAnfang;
function gibZeile(out s: string): boolean;
function einlesen(fnam: string): boolean;
function brauchenoch(bez: string): boolean;
constructor create;
destructor destroy; override;
end;
implementation
uses typenunit;
procedure tInputfile.anAnfang;
begin
zeile:=0;
end;
function tInputfile.gibZeile(out s: string): boolean;
begin
result:=false;
if (zeile<0) or (zeile>=zeilen.count) then exit;
s:=zeilen[zeile];
result:=true;
inc(zeile);
end;
function tInputfile.einlesen(fnam: string): boolean;
var f: textfile;
i,j,k,l,Ebene: longint;
s,t,u,v: string;
SchleifenInhalt: tStringlist;
istWahr,gefunden: boolean;
const binops: array[0..8] of string =
('<=','>=','<>','≤','≥','=','≠','<','>');
begin
result:=false;
assignfile(f,fnam);
reset(f);
zeilen.clear;
while not eof(f) do begin
readln(f,s);
zeilen.add(s);
end;
closefile(f);
zeile:=0;
i:=0;
while i<zeilen.count do begin
s:=zeilen[i];
s:=erstesArgument(s,'#');
if length(s)=0 then begin
zeilen.delete(i);
continue;
end;
zeilen[i]:=s;
inc(i);
end;
i:=0;
while i<zeilen.count do begin
s:=zeilen[i];
if startetMit('!überspringe:',s) then begin
for j:=0 to strtoint(s) do
zeilen.delete(i);
continue;
end;
zeilen[i]:=s;
if s='Dateiende' then begin
inc(i);
while i<zeilen.count do
zeilen.delete(i);
continue;
end;
inc(i);
end;
i:=0;
while i<zeilen.count do begin
s:=zeilen[i];
if startetMit('!Schleife:',s) then begin
l:=i;
zeilen.delete(i);
t:=erstesArgument(s,':');
if (length(t)=0) or (t[1]<>'$') then exit;
SchleifenInhalt:=TStringlist.create;
Ebene:=0;
while (i<zeilen.Count) and ((Ebene<>0) or (zeilen[i]<>'!Schleifenende')) do begin
SchleifenInhalt.Add(zeilen[i]);
if zeilen[i]='!Schleifenende' then dec(Ebene);
if pos('!Schleife:',zeilen[i])=1 then inc(Ebene);
zeilen.delete(i);
end;
zeilen.delete(i);
while length(s)>0 do begin
u:=erstesArgument(s);
for j:=0 to SchleifenInhalt.Count-1 do begin
v:=SchleifenInhalt[j];
k:=length(v);
while (pos(t,v)>0) and (k>0) do begin
v:=copy(v,1,pos(t,v)-1)+u+copy(v,pos(t,v)+length(t),length(v));
dec(k);
end;
zeilen.insert(i,v);
inc(i);
end;
end;
SchleifenInhalt.Free;
i:=l;
continue;
end;
zeilen[i]:=s;
inc(i);
end;
i:=0;
while i<zeilen.count do begin
s:=zeilen[i];
if startetMit('?',s) then begin
t:=erstesArgument(s,':');
gefunden:=false;
for j:=0 to length(binops)-1 do
if pos(binops[j],t)>0 then begin
gefunden:=true;
u:=trim(copy(t,1,pos(binops[j],t)-1));
delete(t,1,pos(binops[j],t)+length(binops[j])-1);
t:=trim(t);
case binops[j] of
'≤','<=': istWahr:=strtofloat(u)<=strtofloat(t);
'≥','>=': istWahr:=strtofloat(u)>=strtofloat(t);
'=':
try
istWahr:=strtofloat(u)=strtofloat(t);
except
istWahr:=u=t;
end;
'≠','<>':
try
istWahr:=strtofloat(u)<>strtofloat(t);
except
istWahr:=u<>t;
end;
'<': istWahr:=strtofloat(u)<strtofloat(t);
'>': istWahr:=strtofloat(u)>strtofloat(t);
else begin
gibAus('Operator '''+binops[j]+''' ist nicht implementiert!',3);
exit;
end;
end{of case};
if not istWahr then
zeilen.delete(i);
break;
end;
if not gefunden then begin
gibAus('Ich kann keinen gültigen Operator in Bedingung '''+t+''' finden!',3);
exit;
end;
if not istWahr then
continue;
zeilen[i]:=s;
end;
inc(i);
end;
i:=0;
while i<zeilen.count do begin
s:=zeilen[i];
if startetMit('!überspringe:',s) then begin
for j:=0 to strtoint(s) do
zeilen.delete(i);
continue;
end;
zeilen[i]:=s;
if s='Dateiende' then begin
inc(i);
while i<zeilen.count do
zeilen.delete(i);
continue;
end;
inc(i);
end;
result:=true;
end;
function tInputfile.brauchenoch(bez: string): boolean;
var i: longint;
s,t: string;
begin
result:=false;
for i:=max(0,zeile-1) to zeilen.count-1 do begin
s:=' '+zeilen[i]+' ';
while pos(bez,s)>0 do begin
t:=copy(s,1,pos(bez,s)+length(bez));
delete(s,1,pos(bez,s)+length(bez)-1);
delete(t,1,length(t)-length(bez)-2);
if (t[1] in [' ',#9,':','[']) and (t[length(t)] in [' ',#9,':',']']) and (copy(t,2,length(bez))=bez) then begin
result:=true;
exit;
end;
end;
end;
end;
constructor tInputfile.create;
begin
inherited create;
zeilen:=tStringlist.create;
zeile:=0;
end;
destructor tInputfile.destroy;
begin
zeilen.free;
inherited destroy;
end;
end.
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