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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 Uri;
interface
{$SCOPEDENUMS ON}
uses
Boolean,
Byte,
Character,
Exception,
Integer,
Integer._32,
Stream.Output,
Text;
type
EUriException = class(EException);
EUriParseException = class(EUriException);
TUriRootType = (Relative, Absolute);
TUriResourceType = (Directory, File_);
TUriPath = record
private
Elements: TArray<TText>;
function GetCount(): TInteger32;
function GetItems(Index: TInteger32): TText;
function GetFirst(): TText;
procedure SetFirst(const Value: TText);
function GetLast(): TText;
procedure SetLast(const Value: TText);
public
RootType: TUriRootType;
ResourceType: TUriResourceType;
procedure Add(const Element: TText); overload;
procedure Add(const Elements: array of TText); overload;
procedure Add(const Path: TUriPath); overload;
function RemoveFirst(): TText;
function RemoveLast(): TText;
function IsEmpty(): TBoolean;
function ToText(): TText;
property Count: TInteger32 read GetCount;
property First: TText read GetFirst write SetFirst;
property Last: TText read GetLast write SetLast;
property Items[Index: TInteger32]: TText read GetItems; default;
public
class function New(RootType: TUriRootType; ResourceType: TUriResourceType; const Elements: array of TText): TUriPath; static;
class function NewFromText(Value: TText): TUriPath; static;
class operator Equal(const Left: TUriPath; const Right: TUriPath): TBoolean;
class operator GreaterThan(const Left: TUriPath; const Right: TUriPath): TBoolean;
end;
TUriParameter = record
private
LiteralValue: TBoolean;
public
Name: TText;
Value: TText;
function ToText(): TText;
public
class function New(Parameter: TText): TUriParameter; overload; static;
class function New(const Name: TText; const Value: TText): TUriParameter; overload; static;
class function NewLiteralValue(Value: TText): TUriParameter; static;
class operator Equal(const Left: TUriParameter; const Right: TUriParameter): TBoolean;
end;
TUriParameterArray = array of TUriParameter;
TUriParameters = record
private
Parameters: TUriParameterArray;
function GetItems(Index: TInteger32): TUriParameter;
public
procedure Add(const Name: TText; const Value: TText); overload;
procedure Add(const Name: TText; const Value: TInteger); overload;
procedure Add(const Name: TText; const Value: TBoolean); overload;
procedure Add(Parameter: TUriParameter); overload;
function GetValue(const Name: TText): TText;
procedure RemoveAt(Index: TInteger32);
procedure Remove(const Name: TText);
function IsEmpty(): TBoolean;
function Count(): TInteger32;
function ToText(): TText;
property Items[Index: TInteger32]: TUriParameter read GetItems; default;
public
class function New(): TUriParameters; overload; static;
class function New(Value: TText): TUriParameters; overload; static;
class operator Equal(const Left: TUriParameters; const Right: TUriParameters): TBoolean;
end;
TUriAuthority = record
public
HostName: TText;
Port: TInteger32;
function IsEmpty(): TBoolean;
function ToText(): TText;
public
class function New(): TUriAuthority; overload; static;
class function New(const HostName: TText; Port: TInteger32 = 0): TUriAuthority; overload; static;
class function NewFromText(Value: TText): TUriAuthority; overload; static;
class operator Equal(const Left: TUriAuthority; const Right: TUriAuthority): TBoolean;
end;
TUri = record
private
class function IsLetter(Character: TCharacter): TBoolean; static;
class function IsSchemeCharacter(Character: TCharacter): TBoolean; static;
class function ParseScheme(var Value: TText): TText; static;
class function EncodeByte(Stream: TOutputStream; Value: TByte): TText; static;
public
Scheme: TText;
Authority: TUriAuthority;
Path: TUriPath;
Parameters: TUriParameters;
Fragment: TText;
function IsAbsolute(): TBoolean;
function IsEmpty(): TBoolean;
function ToText(): TText;
function Resolve(const Uri: TUri): TUri;
function MakeRelative(Destination: TUri): TUri;
function AddParameter(Name, Value: TText): TUri; overload;
function AddParameter(Name: TText; Value: TInteger32): TUri; overload;
public
class function New(): TUri; overload; static;
class function New(Value: TText): TUri; overload; static;
class function NewOpaque(const Scheme: TText; const SchemeSpecificPart: TText): TUri; static;
class function NewUniformResourceName(const Namespace: TText; const NamespaceSpecificPart: TText): TUri; static;
class function NewJavascript(const Javascript: TText): TUri; static;
class function Encode(const Value: TText): TText; static;
class function Decode(const Value: TText): TText; static;
class operator Implicit(const Path: TUriPath): TUri;
class operator Equal(const Left: TUri; const Right: TUri): TBoolean;
class operator NotEqual(const Left: TUri; const Right: TUri): TBoolean;
end;
implementation
uses
Byte.Nibble,
Character.Encoding,
Character.Set_.Unicode,
Integer._32.TextFormat,
Mathematics,
Memory.Block.Physical,
Stream.Input,
Text.Stream.Output;
{ TUri }
function TUri.AddParameter(Name, Value: TText): TUri;
begin
Result := Self;
Result.Parameters.Add(Name, Value);
end;
function TUri.AddParameter(Name: TText; Value: TInteger32): TUri;
begin
Result := Self;
Result.Parameters.Add(Name, Value);
end;
function TUri.ToText(): TText;
begin
Result := '';
if Scheme <> '' then
Result := Result + Scheme + ':';
if not Authority.IsEmpty() then
Result := Result + '//' + Authority.ToText();
Result := Result + Path.ToText();
if not Parameters.IsEmpty then
Result := Result + '?' + Parameters.ToText();
if Fragment <> '' then
Result := Result + '#' + TUri.Encode(Fragment);
end;
class function TUri.Decode(const Value: TText): TText;
var
CodePoint: TCharacterCodePoint;
FirstNibble: TNibble;
SecondNibble: TNibble;
Block: TPhysicalMemoryBlock;
Input: TTextCursor;
Output: TOutputStream;
begin
Input := Value.CreateCursor();
Block := TPhysicalMemoryBlock.Create();
Output := Block.CreateAppendStream();
while not Input.AtEnd do
begin
CodePoint := Input.Read();
if CodePoint = TUnicode.PERCENT_SIGN then
begin
FirstNibble := CharacterToNibble(Input.Read());
SecondNibble := CharacterToNibble(Input.Read());
Output.WriteLittleEndian8((FirstNibble shl 4) or SecondNibble);
end
else
Output.WriteLittleEndian8(CodePoint);
end;
Result := TText.New(TCharacterEncoding.Utf8, Block.Address, Block.Size);
Input.Free();
Output.Free();
Block.Free();
end;
class function TUri.Encode(const Value: TText): TText;
var
Byte: TByte;
Utf8: TText;
Input: TInputStream;
Output: TTextOutputStream;
begin
Utf8 := Value.Recode(TCharacterEncoding.Utf8);
Input := Utf8.CreateInputStream();
Output := TTextOutputStream.Create(TCharacterEncoding.Windows1252, Value.Size);
while not Input.AtEnd() do
begin
Byte := Input.ReadLittleEndian8();
if
Byte in [
TUnicode.DIGIT_ZERO..TUnicode.DIGIT_NINE,
TUnicode.LATIN_SMALL_LETTER_A..TUnicode.LATIN_SMALL_LETTER_Z,
TUnicode.LATIN_CAPITAL_LETTER_A..TUnicode.LATIN_CAPITAL_LETTER_Z,
TUnicode.LOW_LINE,
TUnicode.HYPHEN_MINUS,
TUnicode.FULL_STOP,
TUnicode.TILDE
]
then
Output.WriteLittleEndian8(Byte)
else
EncodeByte(Output, Byte);
end;
Result := Output.GetValue();
Output.Free();
Input.Free();
end;
class function TUri.EncodeByte(Stream: TOutputStream; Value: TByte): TText;
begin
Stream.WriteLittleEndian8(TUnicode.PERCENT_SIGN);
Stream.WriteLittleEndian8(NibbleToCharacter(Value and $F0 shr 4));
Stream.WriteLittleEndian8(NibbleToCharacter(Value and $0F));
end;
class operator TUri.Equal(const Left: TUri; const Right: TUri): TBoolean;
begin
Result :=
(Left.Scheme = Right.Scheme)
and (Left.Authority = Right.Authority)
and (Left.Path = Right.Path)
and (Left.Parameters = Right.Parameters)
and (Left.Fragment = Right.Fragment);
end;
class operator TUri.Implicit(const Path: TUriPath): TUri;
begin
Result := TUri.New();
Result.Path := Path;
end;
function TUri.IsAbsolute(): TBoolean;
begin
Result := Scheme <> '';
end;
function TUri.IsEmpty(): TBoolean;
begin
Result := Authority.IsEmpty() and Path.IsEmpty() and Parameters.IsEmpty() and (Fragment = '');
end;
class function TUri.IsLetter(Character: TCharacter): TBoolean;
begin
Result := Character in ['a'..'z'];
end;
class function TUri.IsSchemeCharacter(Character: TCharacter): TBoolean;
begin
Result := Character in ['a'..'z', '0'..'9', '+', '.', '-'];
end;
function TUri.MakeRelative(Destination: TUri): TUri;
var
i: TInteger32;
RelativePath: TUriPath;
begin
Result := Destination;
// TODO: We probably have to take opaque URIs into account here
if (Destination.Scheme = Scheme) and (Destination.Authority = Authority) and (Path.Count <= Destination.Path.Count) then
begin
i := 0;
while (i < Path.Count) and (Path[i] = Destination.Path[i]) do
Inc(i);
if i = Path.Count then
begin
RelativePath := TUriPath.New(TUriRootType.Relative, Destination.Path.ResourceType, []);
while i < Destination.Path.Count do
begin
RelativePath.Add(Destination.Path[i]);
Inc(i);
end;
Result := TUri.New();
Result.Path := RelativePath;
Result.Parameters := Parameters;
Result.Fragment := Fragment;
end;
end;
end;
class function TUri.New(): TUri;
begin
Result.Scheme := '';
Result.Authority := TUriAuthority.New();
Result.Path := TUriPath.New(TUriRootType.Relative, TUriResourceType.Directory, []);
Result.Parameters := TUriParameters.New();
Result.Fragment := '';
end;
class function TUri.New(Value: TText): TUri;
var
Path: TText;
Query: TText;
BeforeFragment: TText;
IndexOfSlash: TInteger32;
begin
Result := TUri.New();
if Value.Count > 0 then
begin
Result.Scheme := ParseScheme(Value);
if Value.StartsWith('//') then
begin
Value.RemoveFromStart(2);
IndexOfSlash := Value.IndexOf('/');
if IndexOfSlash >= 0 then
Result.Authority := TUriAuthority.NewFromText(Value.RemoveFromStart(IndexOfSlash))
else
begin
Result.Authority := TUriAuthority.NewFromText(Value);
Value := '';
end;
end;
BeforeFragment := Value.Parse('#');
Result.Fragment := TUri.Decode(Value);
Path := BeforeFragment.Parse('?');
Query := BeforeFragment;
Result.Path := TUriPath.NewFromText(Path);
Result.Parameters := TUriParameters.New(Query);
end;
end;
class function TUri.NewJavascript(const Javascript: TText): TUri;
begin
Result := NewOpaque('javascript', Javascript);
end;
class function TUri.NewOpaque(const Scheme: TText; const SchemeSpecificPart: TText): TUri;
begin
Result := TUri.New();
Result.Scheme := Scheme;
Result.Path := TUriPath.New(TUriRootType.Relative, TUriResourceType.File_, [SchemeSpecificPart]);
end;
class function TUri.NewUniformResourceName(const Namespace: TText; const NamespaceSpecificPart: TText): TUri;
begin
// TODO: URNs can be modelled better by not using the underlying hierarchy system as a basis but store the specific structure of a URN instead
Result := TUri.NewOpaque('urn:' + Namespace, NamespaceSpecificPart);
end;
class operator TUri.NotEqual(const Left: TUri; const Right: TUri): TBoolean;
begin
Result := not (Left = Right);
end;
class function TUri.ParseScheme(var Value: TText): TText;
var
i: TInteger32;
begin
Result := '';
if IsLetter(Value[0]) then
begin
i := 0;
while (i < Value.Count) and IsSchemeCharacter(Value[i]) do
Inc(i);
if (i < Value.Count) and (Value[i] = ':') then
begin
Result := Value.RemoveFromStart(i);
Value.RemoveFromStart(1);
end;
end;
end;
function TUri.Resolve(const Uri: TUri): TUri;
begin
if Uri.IsAbsolute() then
Result := Uri
else
begin
Result.Scheme := Scheme;
Result.Authority := Authority;
if Uri.Path.RootType = TUriRootType.Absolute then
Result.Path := Uri.Path
else
begin
Result.Path := Path;
Result.Path.Add(Uri.Path);
end;
Result.Path.ResourceType := Uri.Path.ResourceType;
Result.Parameters := Uri.Parameters;
Result.Fragment := Uri.Fragment;
end;
end;
{ TUriPath }
procedure TUriPath.Add(const Element: TText);
begin
SetLength(Elements, Length(Elements) + 1);
Elements[High(Elements)] := Element;
end;
procedure TUriPath.Add(const Elements: array of TText);
var
i: TInteger32;
begin
for i := 0 to High(Elements) do
Add(Elements[i]);
end;
procedure TUriPath.Add(const Path: TUriPath);
var
i: TInteger32;
begin
for i := 0 to High(Path.Elements) do
Add(Path.Elements[i]);
ResourceType := Path.ResourceType;
end;
function TUriPath.ToText(): TText;
var
i: TInteger32;
begin
if RootType = TUriRootType.Absolute then
Result := '/'
else
Result := '';
if Length(Elements) > 0 then
begin
Result := Result + TUri.Encode(Elements[0]);
for i := 1 to High(Elements) do
Result := Result + '/' + TUri.Encode(Elements[i]) ;
if ResourceType = TUriResourceType.Directory then
Result := Result + '/';
end;
end;
function TUriPath.GetCount(): TInteger32;
begin
Result := Length(Elements);
end;
class operator TUriPath.Equal(const Left: TUriPath; const Right: TUriPath): TBoolean;
var
i: TInteger32;
begin
Result := (Left.RootType = Right.RootType) and (Left.ResourceType = Right.ResourceType) and (Left.Count = Right.Count);
i := 0;
while Result and (i < Left.Count) do
begin
Result := Left[i] = Right[i];
Inc(i);
end;
end;
function TUriPath.GetFirst(): TText;
begin
Result := Elements[0];
end;
function TUriPath.GetItems(Index: TInteger32): TText;
begin
Result := Elements[Index];
end;
function TUriPath.GetLast(): TText;
begin
Result := Elements[High(Elements)];
end;
class operator TUriPath.GreaterThan(const Left, Right: TUriPath): TBoolean;
var
i: TInteger32;
PathLength: TInteger32;
Equal: TBoolean;
begin
if Left.RootType = Right.RootType then
begin
if Left.ResourceType = Right.ResourceType then
begin
Equal := True;
i := 0;
PathLength := Minimum(Left.Count, Right.Count);
while Equal and (i < PathLength) do
begin
Equal := Left[i] = Right[i];
if Equal then
Inc(i);
end;
if i < PathLength then
Result := Left[i] > Right[i]
else
Result := Left.Count > PathLength;
end
else
Result := Left.ResourceType > Right.ResourceType;
end
else
Result := Left.RootType > Right.RootType;
end;
function TUriPath.IsEmpty(): TBoolean;
begin
Result := (RootType <> TUriRootType.Absolute) and (Length(Elements) = 0);
end;
class function TUriPath.New(RootType: TUriRootType; ResourceType: TUriResourceType; const Elements: array of TText): TUriPath;
var
i: TInteger32;
begin
Result.RootType := RootType;
Result.ResourceType := ResourceType;
SetLength(Result.Elements, Length(Elements));
for i := 0 to High(Elements) do
Result.Elements[i] := Elements[i];
end;
class function TUriPath.NewFromText(Value: TText): TUriPath;
var
PathElement: TText;
begin
Result := TUriPath.New(TUriRootType.Relative, TUriResourceType.Directory, []);
if Value.StartsWith('/') then
begin
Value := Value.SubTextFrom(1);
Result.RootType := TUriRootType.Absolute;
end;
while Value.Count > 0 do
begin
PathElement := Value.ParseOptional('/');
if PathElement <> '' then
Result.Add(TUri.Decode(PathElement))
else
begin
Result.Add(TUri.Decode(Value));
Result.ResourceType := TUriResourceType.File_;
Value := '';
end;
end;
end;
function TUriPath.RemoveFirst(): TText;
begin
Result := Elements[0];
Elements := Copy(Elements, 1, Length(Elements) - 1);
end;
function TUriPath.RemoveLast(): TText;
begin
Result := Elements[Length(Elements) - 1];
Elements := Copy(Elements, 0, Length(Elements) - 1);
end;
procedure TUriPath.SetFirst(const Value: TText);
begin
Elements[0] := Value;
end;
procedure TUriPath.SetLast(const Value: TText);
begin
Elements[High(Elements)] := Value;
end;
{ TUriParameters }
procedure TUriParameters.Add(const Name: TText; const Value: TText);
begin
Add(TUriParameter.New(Name, Value));
end;
procedure TUriParameters.Add(const Name: TText; const Value: TInteger);
begin
Add(TUriParameter.New(Name, Value.ToText()));
end;
procedure TUriParameters.Add(const Name: TText; const Value: TBoolean);
var
BooleanValue: TText;
begin
if Value then
BooleanValue := 'true'
else
BooleanValue := 'false';
Add(TUriParameter.New(Name, BooleanValue));
end;
procedure TUriParameters.Add(Parameter: TUriParameter);
begin
SetLength(Parameters, Length(Parameters) + 1);
Parameters[High(Parameters)] := Parameter;
end;
function TUriParameters.ToText(): TText;
var
i: TInteger32;
begin
if Length(Parameters) > 0 then
begin
Result := Parameters[0].ToText();
for i := 1 to High(Parameters) do
Result := Result + '&' + Parameters[i].ToText();
end
else
Result := '';
end;
function TUriParameters.Count: TInteger32;
begin
Result := Length(Parameters);
end;
class operator TUriParameters.Equal(const Left: TUriParameters; const Right: TUriParameters): TBoolean;
var
i: TInteger32;
begin
Result := Left.Count = Right.Count;
i := 0;
while Result and (i < Left.Count) do
begin
Result := Left[i] = Right[i];
Inc(i);
end;
end;
function TUriParameters.GetValue(const Name: TText): TText;
var
Index: TInteger32;
i: TInteger32;
begin
Index := -1;
i := 0;
while (Index = -1) and (i < Count) do
begin
if Self[i].Name = Name then
Index := i
else
Inc(i);
end;
if Index <> -1 then
Result := Self[i].Value
else
Result := '';
end;
function TUriParameters.GetItems(Index: TInteger32): TUriParameter;
begin
Result := Parameters[Index];
end;
function TUriParameters.IsEmpty: TBoolean;
begin
Result := Length(Parameters) = 0;
end;
class function TUriParameters.New: TUriParameters;
begin
SetLength(Result.Parameters, 0);
end;
class function TUriParameters.New(Value: TText): TUriParameters;
begin
SetLength(Result.Parameters, 0);
while Value.Count > 0 do
begin
SetLength(Result.Parameters, Length(Result.Parameters) + 1);
Result.Parameters[High(Result.Parameters)] := TUriParameter.New(Value.Parse('&'));
end;
end;
procedure TUriParameters.Remove(const Name: TText);
var
Index: TInteger32;
i: TInteger32;
begin
Index := -1;
i := 0;
while (Index = -1) and (i < Count) do
begin
if Self[i].Name = Name then
Index := i
else
Inc(i);
end;
if Index <> -1 then
RemoveAt(Index);
end;
procedure TUriParameters.RemoveAt(Index: TInteger32);
var
i: TInteger32;
begin
for i := Index + 1 to Count - 1 do
Parameters[i - 1] := Parameters[i];
SetLength(Parameters, Length(Parameters) - 1);
end;
{ TUriParameter }
function TUriParameter.ToText(): TText;
begin
if LiteralValue then
Result := Value
else
Result := TUri.Encode(Name) + '=' + TUri.Encode(Value);
end;
class operator TUriParameter.Equal(const Left: TUriParameter; const Right: TUriParameter): TBoolean;
begin
Result := (Left.Name = Right.Name) and (Left.Value = Right.Value);
end;
class function TUriParameter.New(const Name: TText; const Value: TText): TUriParameter;
begin
Result.Name := Name;
Result.Value := Value;
Result.LiteralValue := False;
end;
class function TUriParameter.NewLiteralValue(Value: TText): TUriParameter;
begin
Result.Value := Value;
Result.LiteralValue := True;
end;
class function TUriParameter.New(Parameter: TText): TUriParameter;
var
Name: TText;
Value: TText;
begin
Name := Parameter.Parse('=');
Value := Parameter;
Name := Name.Replace('+', ' ');
Value := Value.Replace('+', ' ');
Result.Name := TUri.Decode(Name);
Result.Value := TUri.Decode(Value);
Result.LiteralValue := False;
end;
{ TUriAuthority }
function TUriAuthority.ToText(): TText;
begin
Result := HostName;
if Port > 0 then
Result := Result + ':' + Integer32ToText(Port);
end;
class operator TUriAuthority.Equal(const Left: TUriAuthority; const Right: TUriAuthority): TBoolean;
begin
Result := (Left.HostName = Right.HostName) and (Left.Port = Right.Port);
end;
function TUriAuthority.IsEmpty: TBoolean;
begin
Result := HostName = '';
end;
class function TUriAuthority.New: TUriAuthority;
begin
Result.HostName := '';
Result.Port := 0;
end;
class function TUriAuthority.New(const HostName: TText; Port: TInteger32): TUriAuthority;
begin
Result.HostName := HostName;
Result.Port := Port;
end;
class function TUriAuthority.NewFromText(Value: TText): TUriAuthority;
begin
Result := TUriAuthority.New();
Result.HostName := Value.Parse(':');
if Value <> '' then
Result.Port := TextToInteger32(Value);
end;
end.
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