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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 Text;
interface
uses
Boolean,
Byte,
Byte.Array_.Stream.Input,
Character,
Character.Encoding,
Character.String_,
Enumerator,
Integer._32,
Integer._32.Positive,
Iterator,
Memory.Pointer,
Stream.Input,
Stream.Output;
type
// TODO: TText currently is in a state of refactoring to reach the final state where Unicode is fully supported and TText.Encoding
// always correctly indicates the character encoding used in the TText contents. Currently quite some code still does not take
// this TText.Encoding into account and assumes it to be Windows-1252. Moreover, some functions are still byte oriented.
TTextCursor = class;
PText = ^TText;
TText = record
private
Value: TArray<TByte>;
FEncoding: TCharacterEncoding;
FCount: TInteger32;
function GetCharacter(Index: TInteger32): TAnsiCharacter;
procedure SetCharacter(Index: TInteger32; const Value: TAnsiCharacter);
function GetCodePoint(Index: TInteger32): TCharacterCodePoint;
function GetSize(): TInteger32;
function GetAddress(): TPointer;
function CalculateActualCount(): TInteger32; deprecated;
private
const
FirstCharacterIndex = {$IF Defined(NEXTGEN)}0{$ELSE}1{$ENDIF};
public
class function New(Encoding: TCharacterEncoding): TText; overload; static;
class function New(Encoding: TCharacterEncoding; Contents: PByte; Size: TPositiveInteger32): TText; overload; static;
class function New(Value: PAnsiCharacter): TText; overload; static;
class function New(Encoding: TCharacterEncoding; const Bytes: TArray<TByte>): TText; overload; static;
class function NewOfCharacter(Encoding: TCharacterEncoding; Character: TCharacterCodePoint; Count: TInteger32): TText; static;
class function NewRepeated(const Value: TText; Count: TInteger32): TText; static;
{$IF not Defined(NEXTGEN)}
class operator Implicit(const Operand: TAnsiString): TText;
class operator Implicit(const Operand: TWideString): TText;
class operator Implicit(const Operand: TText): TAnsiString;
class operator Implicit(const Operand: TText): TWideString;
{$ENDIF}
{$IF not Defined(CHARTA_PASCAL)}
class operator Implicit(const Operand: TUnicodeString): TText;
class operator Implicit(const Operand: TText): TUnicodeString;
{$ENDIF}
class operator Add(const Left: TText; const Right: TText): TText;
class operator Equal(const Left: TText; const Right: TText): TBoolean;
class operator NotEqual(const Left: TText; const Right: TText): TBoolean;
class operator GreaterThan(const Left: TText; const Right: TText): TBoolean;
class operator LessThan(const Left: TText; const Right: TText): TBoolean;
public
function IndexOf(const Subtext: TText; StartPosition: TInteger32 = 0): TInteger32;
function LastIndexOf(const Subtext: TText): TInteger32;
function IndexOfNot(const Characters: TCharacterSet; StartPosition: TInteger32 = 0): TInteger32;
function Contains(const Subtext: TText): TBoolean;
function IndexOfCharacter(Character: TCharacterCodePoint): TInteger32;
function ContainsCharacter(Character: TCharacterCodePoint): TBoolean;
function StartsWith(const Subtext: TText): TBoolean;
function EndsWith(const Subtext: TText): TBoolean;
function SubtextEquals(Position: TInteger32; const SubText: TText): TBoolean;
function Subtext(Position: TInteger32; Count: TInteger32): TText;
function SubtextTo(Position: TInteger32): TText;
function SubtextFrom(Position: TInteger32): TText;
function SubtextFromTo(FromPosition: TInteger32; ToPosition: TInteger32): TText;
function SubtextWithoutRight(Count: TInteger32): TText;
function Left(Count: TInteger32): TText;
function Right(Count: TInteger32): TText;
function PadLeft(PadCharacter: TCharacter; TargetCount: TInteger32): TText;
function PadRight(PadCharacter: TCharacter; TargetCount: TInteger32): TText;
function DetermineLineBreakOff(FirstCharacterIndex: TInteger32; LastCharacterIndex: TInteger32): TInteger32;
function Parse(const Delimiter: TText): TText;
function ParseOptional(const Delimiter: TText): TText;
function RemoveFromStart(Count: TInteger32): TText;
function ToUpperCase(): TText;
function ToLowerCase(): TText;
function Trim(): TText;
function ToByteArray(): TArray<TByte>;
function Replace(const Source: TText; const Target: TText): TText;
function CreateInputStream(): TInputStream;
procedure Write(Stream: TOutputStream); overload;
procedure Write(TargetEncoding: TCharacterEncoding; Stream: TOutputStream); overload;
procedure WriteNullTerminated(Stream: TOutputStream);
procedure ReadNullTerminated(SourceEncoding: TCharacterEncoding; Stream: TInputStream);
procedure ReadNullTerminatedOrTillEnd(SourceEncoding: TCharacterEncoding; Stream: TInputStream);
procedure Read(SourceEncoding: TCharacterEncoding; Stream: TInputStream; Count: TInteger32);
procedure ReadTillEnd(SourceEncoding: TCharacterEncoding; Stream: TInputStream);
function CreateIterator(): TIterator<TCharacterCodePoint>;
function CreateCursor(): TTextCursor;
function GetEnumerator(): TEnumerator<TCharacterCodePoint>;
function Recode(Target: TCharacterEncoding): TText;
procedure CopyToNullTerminated(Destination: PAnsiCharacter);
property Count: TInteger32 read FCount;
property Size: TInteger32 read GetSize;
property Address: TPointer read GetAddress;
property Encoding: TCharacterEncoding read FEncoding;
// TODO: The implementation of Character[] should be replaced by the implementation of CodePoint[]
property Character[Index: TInteger32]: TAnsiCharacter read GetCharacter write SetCharacter; default;
property CodePoint[Index: TInteger32]: TCharacterCodePoint read GetCodePoint;
public
const
CarriageReturnLineFeed = #13#10;
LineFeed = #10;
class procedure AssureInitialized(); static;
end;
TTextCursor = class(TObject)
private
function GetAtEnd(): TBoolean;
protected
Value: TText;
ByteStream: TByteArrayInputStream;
public
constructor Create(Value: TText); virtual;
destructor Destroy(); override;
procedure MoveTo(Cursor: TTextCursor);
function Copy(): TTextCursor;
procedure Skip(Count: TInteger32);
function Read(): TCharacterCodePoint; overload;
function Read(Count: TInteger32): TText; overload;
property AtEnd: TBoolean read GetAtEnd;
end;
implementation
uses
Character.Iterator,
Character.Set_.Unicode,
Enumerator.Iterator,
Exception,
Exception.IndexOutOfBounds,
Mathematics,
Text.Collation,
Text.Stream.Output;
{ TText }
class operator TText.Add(const Left: TText; const Right: TText): TText;
var
Target: TTextOutputStream;
Encoding: TCharacterEncoding;
begin
if Left.Count = 0 then
Result := Right
else if Right.Count = 0 then
Result := Left
else
begin
if Left.Encoding.Equal(Right.Encoding) and Left.Encoding.IsConcatenatable() then
begin
Result.FEncoding := Left.Encoding;
Result.FCount := Left.Count + Right.Count;
SetLength(Result.Value, Length(Left.Value) + Length(Right.Value));
Move(Left.Value[0], Result.Value[0], Length(Left.Value));
Move(Right.Value[0], Result.Value[Length(Left.Value)], Length(Right.Value));
end
else
begin
Encoding := TCharacterEncoding.Utf8;
Target := TTextOutputStream.Create(Encoding, Left.Size + Right.Size);
Left.Write(Encoding, Target);
Right.Write(Encoding, Target);
Result := Target.GetValue();
Target.Free();
end;
end;
end;
function TText.GetAddress(): TPointer;
begin
if Count > 0 then
Result := @Value[0]
else
Result := nil;
end;
function TText.GetCharacter(Index: TInteger32): TAnsiCharacter;
var
CodePoint: TCharacterCodePoint;
begin
if Encoding.Equal(TCharacterEncoding.Windows1252) then
begin
if (Index >= 0) and (Index < Count) then
Result := TAnsiCharacter(Value[Index])
else
raise EIndexOutOfBounds.Create(Index);
end
else
begin
CodePoint := Self.CodePoint[Index];
if CodePoint < 128 then
Result := TAnsiCharacter(CodePoint)
else
raise EException.Create('Cannot convert code point to character');
end;
end;
function TText.GetCodePoint(Index: TInteger32): TCharacterCodePoint;
var
Cursor: TTextCursor;
i: TInteger32;
begin
if (Index >= 0) and (Index < Count) then
begin
Cursor := CreateCursor();
Result := $FFFFFFFF;
for i := 0 to Index do
Result := Cursor.Read();
Cursor.Free();
end
else
raise EIndexOutOfBounds.Create(Index);
end;
function TText.GetEnumerator(): TEnumerator<TCharacterCodePoint>;
begin
Result := TIteratorEnumerator<TCharacterCodePoint>.Create(CreateIterator());
end;
function TText.GetSize(): TInteger32;
begin
Result := Length(Value);
end;
class operator TText.GreaterThan(const Left: TText; const Right: TText): TBoolean;
begin
Result := TTextCollation.DefaultCaseSensitive.GreaterThan(Left, Right);
end;
function TText.CalculateActualCount(): TInteger32;
var
Stream: TInputStream;
begin
Result := 0;
Stream := CreateInputStream();
while not Stream.AtEnd() do
begin
Encoding.Decode(Stream);
Inc(Result);
end;
Stream.Free();
end;
{$IF not Defined(NEXTGEN)}
class operator TText.Implicit(const Operand: TAnsiString): TText;
begin
Result.FEncoding := TCharacterEncoding.Windows1252; // TODO: We should use the current Windows code page instead
Result.FCount := Length(Operand);
SetLength(Result.Value, Result.Count);
if Result.Count > 0 then
Move(Operand[FirstCharacterIndex], Result.Value[0], Result.Count);
end;
class operator TText.Implicit(const Operand: TText): TAnsiString;
var
AnsiValue: TText;
begin
if (Operand.Encoding <> nil) and (Operand.Encoding <> TCharacterEncoding.Windows1252) then
AnsiValue := Operand.Recode(TCharacterEncoding.Windows1252) // TODO: We should use the current Windows code page instead
else
AnsiValue := Operand;
SetLength(Result, AnsiValue.Count);
if AnsiValue.Count > 0 then
Move(AnsiValue.Value[0], Result[FirstCharacterIndex], AnsiValue.Count);
end;
class operator TText.Implicit(const Operand: TText): TWideString;
var
Utf16Le: TText;
begin
if (Operand.Encoding <> nil) and (Operand.Encoding <> TCharacterEncoding.Utf16LittleEndian) then
Utf16Le := Operand.Recode(TCharacterEncoding.Utf16LittleEndian)
else
Utf16Le := Operand;
SetLength(Result, Utf16Le.Size div 2);
if Utf16Le.Count > 0 then
Move(Utf16Le.Value[0], Result[FirstCharacterIndex], Utf16Le.Size);
end;
class operator TText.Implicit(const Operand: TWideString): TText;
begin
Result.FEncoding := TCharacterEncoding.Utf16LittleEndian;
Result.FCount := Length(Operand);
SetLength(Result.Value, Result.Count * 2);
if Result.Count > 0 then
Move(Operand[FirstCharacterIndex], Result.Value[0], Result.Size);
Result := Result.Recode(TCharacterEncoding.Utf8);
end;
{$ENDIF}
{$IF not Defined(CHARTA_PASCAL)}
class operator TText.Implicit(const Operand: TUnicodeString): TText;
begin
Result.FEncoding := TCharacterEncoding.Utf16LittleEndian;
Result.FCount := Length(Operand);
SetLength(Result.Value, Result.Count * 2);
if Result.Count > 0 then
Move(Operand[FirstCharacterIndex], Result.Value[0], Result.Size);
Result := Result.Recode(TCharacterEncoding.Utf8);
end;
class operator TText.Implicit(const Operand: TText): TUnicodeString;
var
Utf16Le: TText;
begin
if (Operand.Encoding <> nil) and (Operand.Encoding <> TCharacterEncoding.Utf16LittleEndian) then
Utf16Le := Operand.Recode(TCharacterEncoding.Utf16LittleEndian)
else
Utf16Le := Operand;
SetLength(Result, Utf16Le.Size div 2);
if Utf16Le.Count > 0 then
Move(Utf16Le.Value[0], Result[FirstCharacterIndex], Utf16Le.Size);
end;
{$ENDIF}
function TText.IndexOf(const Subtext: TText; StartPosition: TInteger32 = 0): TInteger32;
var
Index: TInteger32;
LastIndex: TInteger32;
begin
// TODO: This is a very simple search procedure and be improved upon by using something like the Boyer-More algorithm
Result := -1;
Index := StartPosition;
LastIndex := Count - Subtext.Count;
while (Result = -1) and (Index <= LastIndex) do
begin
if SubtextEquals(Index, Subtext) then
Result := Index
else
Inc(Index);
end;
end;
function TText.IndexOfCharacter(Character: TCharacterCodePoint): TInteger32;
var
Input: TTextCursor;
Index: TInteger32;
begin
Input := CreateCursor();
Result := -1;
Index := 0;
while (Result = -1) and not Input.AtEnd do
begin
if Input.Read() = Character then
Result := Index
else
Inc(Index);
end;
Input.Free();
end;
function TText.IndexOfNot(const Characters: TCharacterSet; StartPosition: TInteger32 = 0): TInteger32;
var
Index: TInteger32;
begin
Result := -1;
Index := StartPosition;
while (Result = -1) and (Index < Count) do
begin
if not (Self[Index] in Characters) then
Result := Index
else
Inc(Index);
end;
end;
function TText.LastIndexOf(const Subtext: TText): TInteger32;
begin
Result := Maximum(-1, Count - Subtext.Count);
while (Result >= 0) and (Self.Subtext(Result, Subtext.Count) <> Subtext) do
Dec(Result);
end;
class function TText.New(Encoding: TCharacterEncoding; Contents: PByte; Size: TPositiveInteger32): TText;
begin
SetLength(Result.Value, Size);
if Size > 0 then
Move(Contents^, Result.Value[0], Size);
Result.FEncoding := Encoding;
Result.FCount := Result.CalculateActualCount();
end;
class function TText.New(Value: PAnsiCharacter): TText;
var
Length: TInteger32;
begin
Length := 0;
while Value[Length] <> #0 do
Inc(Length);
SetLength(Result.Value, Length);
if Length > 0 then
Move(Value^, Result.Value[0], Length);
Result.FEncoding := TCharacterEncoding.Windows1252;
Result.FCount := Length;
end;
class function TText.New(Encoding: TCharacterEncoding; const Bytes: TArray<TByte>): TText;
begin
SetLength(Result.Value, Length(Bytes));
if Length(Bytes) > 0 then
Move(Bytes[0], Result.Value[0], Length(Bytes));
Result.FEncoding := Encoding;
Result.FCount := Result.CalculateActualCount();
end;
class function TText.NewOfCharacter(Encoding: TCharacterEncoding; Character: TCharacterCodePoint; Count: TInteger32): TText;
var
i: TInteger32;
Target: TTextOutputStream;
begin
Target := TTextOutputStream.Create(Encoding, Count);
for i := 0 to Count - 1 do
Encoding.Encode(Target, Character);
Result := Target.GetValue();
Target.Free();
end;
class function TText.New(Encoding: TCharacterEncoding): TText;
begin
Result.FEncoding := Encoding;
Result.FCount := 0;
Result.Value := nil;
end;
class function TText.NewRepeated(const Value: TText; Count: TInteger32): TText;
var
i: TInteger32;
Target: TTextOutputStream;
begin
Target := TTextOutputStream.Create(Value.Encoding, Count * Value.Size);
for i := 1 to Count do
Value.Write(Target);
Result := Target.GetValue();
Target.Free();
end;
class operator TText.NotEqual(const Left: TText; const Right: TText): TBoolean;
begin
Result := not TTextCollation.DefaultCaseSensitive.Equal(Left, Right);
end;
function TText.PadLeft(PadCharacter: TCharacter; TargetCount: TInteger32): TText;
begin
Result := Self;
if Result.Count < TargetCount then
Result := TText.NewRepeated(PadCharacter, TargetCount - Count) + Self;
end;
function TText.PadRight(PadCharacter: TCharacter; TargetCount: TInteger32): TText;
begin
Result := Self;
if Result.Count < TargetCount then
Result := Self + TText.NewRepeated(PadCharacter, TargetCount - Count);
end;
function TText.Parse(const Delimiter: TText): TText;
var
Index: TInteger32;
begin
Index := IndexOf(Delimiter);
if Index >= 0 then
begin
Result := Subtext(0, Index);
Self := Subtext(Index + Delimiter.Count, Count - Delimiter.Count - Index);
end
else
begin
Result := Self;
Self := '';
end;
end;
function TText.ParseOptional(const Delimiter: TText): TText;
var
Index: TInteger32;
begin
Index := IndexOf(Delimiter);
if Index >= 0 then
begin
Result := Subtext(0, Index);
Self := Subtext(Index + Delimiter.Count, Count - Delimiter.Count - Index);
end
else
Result := '';
end;
function TText.SubtextWithoutRight(Count: TInteger32): TText;
begin
Result := SubtextTo(Self.Count - Count - 1);
end;
procedure TText.Read(SourceEncoding: TCharacterEncoding; Stream: TInputStream; Count: TInteger32);
var
i: TInteger32;
CodePoint: TCharacterCodePoint;
Target: TTextOutputStream;
begin
Target := TTextOutputStream.Create(Encoding, Count);
for i := 1 to Count do
begin
CodePoint := SourceEncoding.Decode(Stream);
Encoding.Encode(Target, CodePoint);
end;
Self := Target.GetValue();
Target.Free();
end;
function TText.Recode(Target: TCharacterEncoding): TText;
var
InputStream: TInputStream;
OutputStream: TTextOutputStream;
begin
if Encoding = Target then
Result := Self
else
begin
InputStream := CreateInputStream();
OutputStream := TTextOutputStream.Create(Target, Size);
while not InputStream.AtEnd() do
Target.Encode(OutputStream, Encoding.Decode(InputStream));
Result := OutputStream.GetValue();
OutputStream.Free();
InputStream.Free();
end;
end;
procedure TText.ReadNullTerminated(SourceEncoding: TCharacterEncoding; Stream: TInputStream);
var
CodePoint: TCharacterCodePoint;
Target: TTextOutputStream;
begin
Target := TTextOutputStream.Create(Encoding, 16);
CodePoint := SourceEncoding.Decode(Stream);
while CodePoint <> TUnicode.NULL do
begin
Encoding.Encode(Target, CodePoint);
CodePoint := SourceEncoding.Decode(Stream);
end;
Self := Target.GetValue();
Target.Free();
end;
procedure TText.ReadNullTerminatedOrTillEnd(SourceEncoding: TCharacterEncoding; Stream: TInputStream);
var
CodePoint: TCharacterCodePoint;
Target: TTextOutputStream;
NullFound: TBoolean;
begin
Target := TTextOutputStream.Create(Encoding, 16);
NullFound := False;
while not NullFound and not Stream.AtEnd() do
begin
CodePoint := SourceEncoding.Decode(Stream);
NullFound := CodePoint = TUnicode.NULL;
if not NullFound then
Encoding.Encode(Target, CodePoint);
end;
Self := Target.GetValue();
Target.Free();
end;
procedure TText.ReadTillEnd(SourceEncoding: TCharacterEncoding; Stream: TInputStream);
var
CodePoint: TCharacterCodePoint;
Target: TTextOutputStream;
begin
Target := TTextOutputStream.Create(Encoding, Stream.Available());
while not Stream.AtEnd() do
begin
CodePoint := SourceEncoding.Decode(Stream);
Encoding.Encode(Target, CodePoint);
end;
Self := Target.GetValue();
Target.Free();
end;
function TText.RemoveFromStart(Count: TInteger32): TText;
begin
Result := SubtextTo(Count - 1);
Self := SubtextFrom(Count);
end;
function TText.Replace(const Source: TText; const Target: TText): TText;
var
Low: TInteger32;
High: TInteger32;
begin
Result := '';
Low := 0;
repeat
High := IndexOf(Source, Low);
if High <> -1 then
begin
Result := Result + SubtextFromTo(Low, High - 1) + Target;
Low := High + Source.Count;
end;
until High = -1;
Result := Result + SubtextFrom(Low);
end;
function TText.Right(Count: TInteger32): TText;
begin
Result := SubtextFrom(Self.Count - Count);
end;
class procedure TText.AssureInitialized();
begin
TCharacterEncoding.AssureInitialized();
TTextCollation.AssureInitialized();
end;
function TText.Contains(const Subtext: TText): TBoolean;
begin
Result := IndexOf(Subtext) <> -1;
end;
function TText.ContainsCharacter(Character: TCharacterCodePoint): TBoolean;
begin
Result := IndexOfCharacter(Character) <> -1;
end;
procedure TText.CopyToNullTerminated(Destination: PAnsiCharacter);
begin
if Size > 0 then
Move(Value[0], Destination^, Size);
Destination[Size] := #0;
end;
function TText.CreateCursor(): TTextCursor;
begin
Result := TTextCursor.Create(Self);
end;
function TText.CreateInputStream(): TInputStream;
begin
Result := TByteArrayInputStream.Create(Value);
end;
function TText.CreateIterator(): TIterator<TCharacterCodePoint>;
var
Iterator: TCharacterIterator;
begin
Iterator := TCharacterIterator.Create(CreateInputStream(), Encoding);
Iterator.OwnsStream := True;
Result := Iterator;
end;
{
This function will try to find a point to break off a line given a maximum character index.
Currently walks back until it finds a space or the FirstCharacterIndex, and returns the index
before the space, meaning the last index that should be included in the line.
If no space can be found before the FirstCharacterIndex the maximum -1 is returned.
If a maximum greater or equal to the length of the text is given, the last valid index of the text is returned.
}
function TText.DetermineLineBreakOff(FirstCharacterIndex: TInteger32; LastCharacterIndex: TInteger32): TInteger32;
var
Index: TInteger32;
begin
if LastCharacterIndex >= Count then
Result := Count - 1
else
begin
Index := LastCharacterIndex;
while (Subtext(Index, 1) <> ' ') and (Index > FirstCharacterIndex) do
Dec(Index);
Result := Index - 1;
if Result <= FirstCharacterIndex then
Result := LastCharacterIndex - 1;
end;
end;
function TText.EndsWith(const Subtext: TText): TBoolean;
begin
Result := (Count >= Subtext.Count) and SubtextEquals(Count - Subtext.Count, Subtext);
end;
class operator TText.Equal(const Left: TText; const Right: TText): TBoolean;
begin
Result := TTextCollation.DefaultCaseSensitive.Equal(Left, Right);
end;
procedure TText.SetCharacter(Index: TInteger32; const Value: TAnsiCharacter);
var
Source: TTextCursor;
Target: TTextOutputStream;
i: TInteger32;
begin
if (Index >= 0) and (Index < Count) then
begin
Source := CreateCursor();
Target := TTextOutputStream.Create(Encoding, Size);
for i := 0 to Index - 1 do
Encoding.Encode(Target, Source.Read());
Source.Read();
Encoding.Encode(Target, Ord(Value));
for i := Index + 1 to Count - 1 do
Encoding.Encode(Target, Source.Read());
Self := Target.GetValue();
Source.Free();
Target.Free();
end
else
raise EIndexOutOfBounds.Create(Index);
end;
function TText.Left(Count: TInteger32): TText;
begin
Result := Subtext(0, Count);
end;
class operator TText.LessThan(const Left: TText; const Right: TText): TBoolean;
begin
Result := TTextCollation.DefaultCaseSensitive.LessThan(Left, Right);
end;
function TText.StartsWith(const Subtext: TText): TBoolean;
begin
Result := SubtextEquals(0, Subtext);
end;
function TText.Subtext(Position: TInteger32; Count: TInteger32): TText;
var
Characters: TTextCursor;
i: TInteger32;
OutputStream: TTextOutputStream;
begin
Characters := CreateCursor();
for i := 1 to Position do
Characters.Read();
OutputStream := TTextOutputStream.Create(Encoding, Count);
for i := 1 to Count do
Encoding.Encode(OutputStream, Characters.Read());
Result := OutputStream.GetValue();
OutputStream.Free();
Characters.Free();
end;
function TText.SubtextEquals(Position: TInteger32; const Subtext: TText): TBoolean;
var
Index: TInteger32;
Count: TInteger32;
Source: TTextCursor;
Target: TTextCursor;
i: TInteger32;
SourceCodePoint: TCharacterCodePoint;
TargetCodePoint: TCharacterCodePoint;
begin
Count := Subtext.Count;
Result := Position + Count <= Self.Count;
if Result then
begin
Target := Subtext.CreateCursor();
Source := CreateCursor();
for i := 0 to Position - 1 do
Source.Read();
Index := 0;
while Result and (Index < Count) do
begin
SourceCodePoint := Source.Read();
TargetCodePoint := Target.Read();
Result := SourceCodePoint = TargetCodePoint;
Inc(Index);
end;
Source.Free();
Target.Free();
end;
end;
function TText.SubtextFrom(Position: TInteger32): TText;
begin
Result := Subtext(Position, Count - Position);
end;
function TText.SubtextFromTo(FromPosition: TInteger32; ToPosition: TInteger32): TText;
begin
Result := Subtext(FromPosition, ToPosition - FromPosition + 1);
end;
function TText.SubtextTo(Position: TInteger32): TText;
begin
Result := Subtext(0, Position + 1);
end;
function TText.ToByteArray(): TArray<TByte>;
begin
Result := Value;
SetLength(Result, Length(Value)); // This assures a unique copy
end;
function TText.ToLowerCase(): TText;
var
Character: TCharacterCodePoint;
Target: TTextOutputStream;
begin
Target := TTextOutputStream.Create(Encoding, Size);
for Character in Self do
Encoding.Encode(Target, CharacterToLowerCase(Character));
Result := Target.GetValue();
Target.Free();
end;
function TText.ToUpperCase(): TText;
var
Character: TCharacterCodePoint;
Target: TTextOutputStream;
begin
Target := TTextOutputStream.Create(Encoding, Size);
for Character in Self do
Encoding.Encode(Target, CharacterToUpperCase(Character));
Result := Target.GetValue();
Target.Free();
end;
function TText.Trim(): TText;
var
Leading: TInteger32;
Trailing: TInteger32;
begin
Leading := 0;
Trailing := Count - 1;
while (Leading <= Trailing) and (Self[Leading] <= ' ') do
Inc(Leading);
if Leading > Trailing then
Result := ''
else
begin
while Self[Trailing] <= ' ' do
Dec(Trailing);
Result := SubtextFromTo(Leading, Trailing);
end;
end;
procedure TText.Write(Stream: TOutputStream);
begin
if Length(Value) > 0 then
Stream.Write(Value[0], Length(Value));
end;
procedure TText.WriteNullTerminated(Stream: TOutputStream);
begin
if Length(Value) > 0 then
Stream.Write(Value[0], Length(Value));
Encoding.Encode(Stream, TUnicode.NULL);
end;
procedure TText.Write(TargetEncoding: TCharacterEncoding; Stream: TOutputStream);
var
Character: TCharacterCodePoint;
begin
if Count > 0 then
begin
if Encoding.Equal(TargetEncoding) then
Write(Stream)
else
begin
for Character in Self do
TargetEncoding.Encode(Stream, Character);
end;
end;
end;
{ TTextCursor }
function TTextCursor.Copy(): TTextCursor;
begin
Result := TTextCursor.Create(Value);
Result.ByteStream.Index := ByteStream.Index;
end;
constructor TTextCursor.Create(Value: TText);
begin
inherited Create();
Self.Value := Value;
ByteStream := TByteArrayInputStream.Create(Value.Value);
end;
destructor TTextCursor.Destroy();
begin
ByteStream.Free();
inherited Destroy();
end;
function TTextCursor.GetAtEnd(): TBoolean;
begin
Result := ByteStream.AtEnd();
end;
procedure TTextCursor.MoveTo(Cursor: TTextCursor);
begin
if ByteStream.Value = Cursor.ByteStream.Value then
ByteStream.Index := Cursor.ByteStream.Index
else
raise EException.Create('Imcompatible cursor');
end;
function TTextCursor.Read(): TCharacterCodePoint;
begin
Result := Value.Encoding.Decode(ByteStream);
end;
function TTextCursor.Read(Count: TInteger32): TText;
var
Start: TPositiveInteger32;
Index: TInteger32;
begin
Result.FEncoding := Value.Encoding;
Result.FCount := Count;
Start := ByteStream.Index;
for Index := 1 to Count do
Value.Encoding.Decode(ByteStream);
SetLength(Result.Value, ByteStream.Index - Start);
Move(ByteStream.Value[Start], Result.Value[0], Result.Size);
end;
procedure TTextCursor.Skip(Count: TInteger32);
var
Index: TInteger32;
begin
for Index := 1 to Count do
Value.Encoding.Decode(ByteStream);
end;
initialization
TText.AssureInitialized();
end.
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