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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit Integer._32.Interval;
interface
uses
Boolean,
Integer._32,
Text;
type
TInteger32Interval = record
private
function GetSize(): TInteger32;
procedure SetSize(const Value: TInteger32);
public
Low: TInteger32;
High: TInteger32;
function IsValid(): TBoolean;
function Contains(Value: TInteger32): TBoolean;
function ContainsLeftInclusive(Value: TInteger32): TBoolean;
function ContainsRange(const Range: TInteger32Interval): TBoolean;
function ContainsCircular(Value: TInteger32): TBoolean;
function Intersect(const Interval: TInteger32Interval): TInteger32Interval;
function Offset(Value: TInteger32): TInteger32Interval;
function RestrictValue(Value: TInteger32): TInteger32;
function GetMiddle(): TInteger32;
function ToText(): TText;
property Size: TInteger32 read GetSize write SetSize;
public
class var
Null: TInteger32Interval;
class procedure Initialize(); static;
class function New(Low: TInteger32; High: TInteger32): TInteger32Interval; static;
class function NewSingleValue(Value: TInteger32): TInteger32Interval; static;
class function NewFromSize(Size: TInteger32): TInteger32Interval; static;
class function NewFromOffsetSize(Offset: TInteger32; Size: TInteger32): TInteger32Interval; static;
class operator Equal(const Left: TInteger32Interval; const Right: TInteger32Interval): TBoolean;
class operator NotEqual(const Left: TInteger32Interval; const Right: TInteger32Interval): TBoolean;
end;
implementation
uses
Integer._32.TextFormat,
Mathematics;
{ TInteger32Interval }
function TInteger32Interval.ToText(): TText;
begin
Result := '[' + Integer32ToText(Low) + ', ' + Integer32ToText(High) + ']';
end;
function TInteger32Interval.RestrictValue(Value: TInteger32): TInteger32;
begin
if Value < Low then
Result := Low
else if Value > High then
Result := High
else
Result := Value;
end;
function TInteger32Interval.Contains(Value: TInteger32): TBoolean;
begin
Result := (Value >= Low) and (Value <= High);
end;
function TInteger32Interval.ContainsLeftInclusive(Value: TInteger32): TBoolean;
begin
Result := (Value >= Low) and (Value < High);
end;
function TInteger32Interval.ContainsRange(const Range: TInteger32Interval): TBoolean;
begin
Result := Contains(Range.Low) and Contains(Range.High);
end;
class operator TInteger32Interval.Equal(const Left: TInteger32Interval; const Right: TInteger32Interval): TBoolean;
begin
Result := (Left.Low = Right.Low) or (Left.High = Right.High);
end;
function TInteger32Interval.GetMiddle(): TInteger32;
begin
Result := Low + (High - Low) div 2;
end;
function TInteger32Interval.GetSize(): TInteger32;
begin
Result := High - Low + 1;
end;
function TInteger32Interval.ContainsCircular(Value: TInteger32): TBoolean;
begin
if Low <= High then
Result := (Value >= Low) and (Value <= High)
else
Result := (Value >= Low) or (Value <= High);
end;
class procedure TInteger32Interval.Initialize();
begin
Null := TInteger32Interval.New(System.High(TInteger32), System.Low(TInteger32));
end;
function TInteger32Interval.Intersect(const Interval: TInteger32Interval): TInteger32Interval;
begin
Result.Low := Maximum(Self.Low, Interval.Low);
Result.High := Minimum(Self.High, Interval.High);
end;
function TInteger32Interval.IsValid(): TBoolean;
begin
Result := Low <= High;
end;
class function TInteger32Interval.New(Low: TInteger32; High: TInteger32): TInteger32Interval;
begin
Result.Low := Low;
Result.High := High;
end;
class function TInteger32Interval.NewFromOffsetSize(Offset: TInteger32; Size: TInteger32): TInteger32Interval;
begin
Result := TInteger32Interval.New(Offset, Offset + Size - 1);
end;
class function TInteger32Interval.NewFromSize(Size: TInteger32): TInteger32Interval;
begin
Result := NewFromOffsetSize(0, Size);
end;
class function TInteger32Interval.NewSingleValue(Value: TInteger32): TInteger32Interval;
begin
Result := New(Value, Value);
end;
class operator TInteger32Interval.NotEqual(const Left: TInteger32Interval; const Right: TInteger32Interval): TBoolean;
begin
Result := (Left.Low <> Right.Low) or (Left.High <> Right.High);
end;
function TInteger32Interval.Offset(Value: TInteger32): TInteger32Interval;
begin
Result := TInteger32Interval.New(Low + Value, High + Value);
end;
procedure TInteger32Interval.SetSize(const Value: TInteger32);
begin
High := Low + Value - 1;
end;
initialization
TInteger32Interval.Initialize();
end.
|