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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 Dom.Element;
interface
uses
Collection.List,
Dom.Attribute,
Dom.Node,
Dom.Text,
Exception,
Iterator,
Text,
Text.Document.Position;
type
EDomElement = class(EException);
TDomElement = class(TDomNode)
private
FName: TText;
FAttributes: TDomAttributeMap;
FNodes: TList<TDomNode>;
FPosition: TSourcePosition;
public
constructor Create(const Name: TText); virtual;
destructor Destroy(); override;
function ElementWithName(Name: TText): TDomElement;
function ElementsWithName(Name: TText): TList<TDomElement>;
function ElementWithNameAndAttributeValue(const Name: TText; const AttributeName: TText; const AttributeValue: TText): TDomElement;
function ElementWithAttributeValue(const Name: TText; const Value: TText): TDomElement;
function ElementForPath(const NamePath: array of TText): TDomElement;
function GetFirstElement(): TDomElement; deprecated 'Please be exact in locating elements';
function GetText(): TText;
function GetTextWithDefault(const Default: TText): TText;
function GetOrCreateText(): TDomText;
function CreateElementIterator(): TIterator<TDomElement>;
function CreateElementWithNameIterator(const Name: TText): TIterator<TDomElement>;
property Name: TText read FName write FName;
property Attributes: TDomAttributeMap read FAttributes;
property Nodes: TList<TDomNode> read FNodes;
property Position: TSourcePosition read FPosition write FPosition;
public
class function CreateWithTextContent(Name: TText; TextContent: TText): TDomElement;
end;
implementation
uses
Dom.Element.Iterator,
Integer._32,
Object_.List,
Reference.User;
{ TDomElement }
constructor TDomElement.Create(const Name: TText);
begin
inherited Create();
FName := Name;
FAttributes := TDomAttributeMap.Create();
FNodes := TObjectList<TDomNode>.Create();
end;
function TDomElement.CreateElementIterator(): TIterator<TDomElement>;
begin
Result := TDomNodeListElementIterator.Create(Nodes);
end;
function TDomElement.CreateElementWithNameIterator(const Name: TText): TIterator<TDomElement>;
begin
Result := TDomNodeListElementWithNameIterator.Create(Nodes, Name);
end;
class function TDomElement.CreateWithTextContent(Name: TText; TextContent: TText): TDomElement;
var
ContentNode: TDomText;
begin
ContentNode := TDomText.Create();
ContentNode.Text := TextContent;
Result := TDomElement.Create(Name);
Result.Nodes.Add(ContentNode);
end;
destructor TDomElement.Destroy();
begin
Attributes.Free();
Nodes.Free();
inherited Destroy();
end;
function TDomElement.ElementForPath(const NamePath: array of TText): TDomElement;
var
i: TInteger32;
begin
Result := Self;
i := 0;
while (Result <> nil) and (i < Length(NamePath)) do
begin
Result := Result.ElementWithName(NamePath[i]);
Inc(i);
end;
end;
function TDomElement.GetText(): TText;
begin
case Nodes.Count of
0: Result := '';
1:
if Nodes.First is TDomText then
Result := (Nodes.First as TDomText).Text
else
raise EDomElement.Create('Text node expected');
else
raise EDomElement.Create('Element contains markup');
end;
end;
function TDomElement.GetTextWithDefault(const Default: TText): TText;
begin
if Self <> nil then
Result := GetText()
else
Result := Default;
end;
function TDomElement.ElementWithAttributeValue(const Name: TText; const Value: TText): TDomElement;
var
Iterator: TIterator<TDomElement>;
Attribute: TDomAttribute;
begin
Result := nil;
Iterator := CreateElementIterator();
while (Result = nil) and Iterator.IsValid do
begin
Attribute := Iterator.Current.Attributes.GetOptional(Name);
if (Attribute <> nil) and (Attribute.AsText = Value) then
Result := Iterator.Current
else
Iterator.GotoNext();
end;
Iterator.Free();
end;
function TDomElement.ElementWithName(Name: TText): TDomElement;
var
Iterator: TIterator<TDomElement>;
begin
Result := nil;
Iterator := CreateElementIterator();
while (Result = nil) and Iterator.IsValid do
begin
if Iterator.Current.Name = Name then
Result := Iterator.Current
else
Iterator.GotoNext();
end;
Iterator.Free();
end;
function TDomElement.ElementWithNameAndAttributeValue(const Name: TText; const AttributeName: TText; const AttributeValue: TText): TDomElement;
var
Iterator: TIterator<TDomElement>;
Attribute: TDomAttribute;
begin
Result := nil;
Iterator := CreateElementWithNameIterator(Name);
while (Result = nil) and Iterator.IsValid do
begin
Attribute := Iterator.Current.Attributes.GetOptional(AttributeName);
if (Attribute <> nil) and (Attribute.AsText = AttributeValue) then
Result := Iterator.Current
else
Iterator.GotoNext();
end;
Iterator.Free();
end;
function TDomElement.ElementsWithName(Name: TText): TList<TDomElement>;
var
i: TInteger32;
Element: TDomElement;
begin
Result := TObjectList<TDomElement>.Create();
Result.ElementManager := TReferenceUser<TDomElement>.Create();
for i := 0 to Nodes.Count - 1 do
begin
if Nodes[i] is TDomElement then
begin
Element := Nodes[i] as TDomElement;
if Element.Name = Name then
Result.Add(Element);
end;
end;
end;
function TDomElement.GetFirstElement(): TDomElement;
var
i: TInteger32;
begin
Result := nil;
i := 0;
while (Result = nil) and (i < Nodes.Count) do
begin
if Nodes[i] is TDomElement then
Result := Nodes[i] as TDomElement
else
Inc(i);
end;
end;
function TDomElement.GetOrCreateText(): TDomText;
begin
if (Nodes.Count > 0) and (Nodes.Last is TDomText) then
Result := Nodes.Last as TDomText
else
begin
Result := TDomText.Create();
Nodes.Add(Result);
end;
end;
end.
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