unit VTSFUNCS;
(************************************************)
(* VTSFUNCS.PAS *)
(* Author: Daniel Marschall *)
(* Revision: 2022-02-14 *)
(* License: Apache 2.0 *)
(* This file contains: *)
(* - Various functions *)
(************************************************)
interface
function Max(a, b: integer): integer;
function Min(a, b: integer): integer;
function CompareEqualLengthString(a, b: string): integer;
function CompareNumericString(a, b: string): integer;
procedure Beep;
function Trim(s: string): string;
function TrimLineToWidth(s: string; width: integer): string;
function ZeroPad(i: LongInt; n: integer): string;
function LeftPadStr(s: string; n: integer; ch: char): string;
function RightPadStr(s: string; n: integer; ch: char): string;
function RepeatStr(ch: char; n: integer): string;
function DeleteFile(filename: string): boolean;
function FileExists(filename: string): boolean;
function IsPositiveInteger(s: string): boolean;
function StrToInt(s: string): Integer;
function IntToStr(Value: Integer): string;
implementation
uses
Crt;
function Max(a, b: integer): integer;
begin
if a > b then
Max := a
else
Max := b;
end;
function Min(a, b: integer): integer;
begin
if a < b then
Min := a
else
Min := b;
end;
function CompareEqualLengthString(a, b: string): integer;
var
ao, bo, i: integer;
begin
CompareEqualLengthString := 0;
for i := 1 to Length(a) do
begin
ao := Ord(a[i]);
bo := Ord(b[i]);
if ao > bo then
begin
CompareEqualLengthString := 1;
break;
end;
if ao < bo then
begin
CompareEqualLengthString := -1;
break;
end;
end;
end;
function CompareNumericString(a, b: string): integer;
var
EqualLength: integer;
begin
EqualLength := Max(Length(a), Length(b));
a := LeftPadStr(a, EqualLength, '0');
b := LeftPadStr(b, EqualLength, '0');
CompareNumericString := CompareEqualLengthString(a, b);
end;
procedure Beep;
begin
Sound(220); (*220Hz*)
Delay(200); (*200ms*)
NoSound;
end;
function Trim(s: string): string;
begin
while Length(s) > 0 do
begin
if s[1] in [#9,#10,#13,' '] then
Delete(s,1,1)
else
break;
end;
while Length(s) > 0 do
begin
if s[Length(s)] in [#9,#10,#13,' '] then
Delete(s,Length(s),1)
else
break;
end;
Trim := s;
end;
function TrimLineToWidth(s: string; width: integer): string;
begin
(* TODO: Put into VTSUTILS, also use for VTSCUI menu *)
if Length(s) > width then
begin
s := Copy(s, 1, width-3) + '...';
end;
TrimLineToWidth := s;
end;
function ZeroPad(i: LongInt; n: integer): string;
var
s: string;
begin
s := IntToStr(i);
ZeroPad := LeftPadStr(s, n, '0');
end;
function LeftPadStr(s: string; n: integer; ch: char): string;
begin
while Length(s) < n do
begin
s := ch + s;
end;
LeftPadStr := s;
end;
function RightPadStr(s: string; n: integer; ch: char): string;
begin
while Length(s) < n do
begin
s := s + ch;
end;
RightPadStr := s;
end;
function RepeatStr(ch: char; n: integer): string;
var
i: integer;
res: string;
begin
res := '';
for i := 1 to n do
begin
res := res + ch;
end;
RepeatStr := res;
end;
function DeleteFile(filename: string): boolean;
var
F: file;
Ch: Char;
begin
Assign(F, filename);
{$I-}
Reset(F);
{$I+}
if IOResult <> 0 then
begin
DeleteFile := false; (* cannot find file *)
end
else
begin
Close(F);
{$I-}
Erase(F);
{$I+}
DeleteFile := IOResult = 0;
end;
end;
function FileExists(filename: string): boolean;
var
F: Text;
begin
Assign(F, filename);
{$I-}
Reset(F);
{$I+}
if IoResult = 0 then
begin
Close(F);
FileExists := true;
end
else
begin
FileExists := false;
end;
end;
function IsPositiveInteger(s: string): boolean;
var
i: integer;
begin
IsPositiveInteger := false;
if Length(s) = 0 then exit;
if (s[1] = '0') and (s <> '0') then exit;
for i := 1 to Length(s) do
begin
if not (s[i] in ['0'..'9']) then exit;
end;
IsPositiveInteger := true;
end;
function StrToInt(s: string): Integer;
var
i, Error: Integer;
begin
Val(s, i, Error);
StrToInt := i;
end;
function IntToStr(Value: Integer): string;
var
s: string;
begin
Str(Value, s);
IntToStr := s;
end;
end.