Visualize a tree: Difference between revisions
Added Delphi example
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=={{header|Delphi}}==
{{libheader| System.SysUtils}}
{{Trans|Go}}
<lang Delphi>
program Visualize_a_tree;
{$APPTYPE CONSOLE}
uses
System.SysUtils;
type
TNode = record
_label: string;
children: TArray<Integer>;
end;
TTree = TArray<TNode>;
TTreeHelper = record helper for TTree
procedure AddNode(lb: string; chl: TArray<Integer> = []);
end;
procedure Vis(t: TTree);
procedure f(n: Integer; pre: string);
begin
var ch := t[n].children;
if Length(ch) = 0 then
begin
Writeln('-', t[n]._label);
exit;
end;
writeln('+', t[n]._label);
var last := Length(ch) - 1;
for var c in copy(ch, 0, last) do
begin
write(pre, '+-');
f(c, pre + '¦ ');
end;
write(pre, '+-');
f(ch[last], pre + ' ');
end;
begin
if Length(t) = 0 then
begin
writeln('<empty>');
exit;
end;
f(0, '');
end;
{ TTreeHelper }
procedure TTreeHelper.AddNode(lb: string; chl: TArray<Integer> = []);
begin
SetLength(self, Length(self) + 1);
with self[High(self)] do
begin
_label := lb;
if Length(chl) > 0 then
children := copy(chl, 0, length(chl));
end;
end;
var
Tree: TTree;
begin
Tree.AddNode('root', [1, 2, 3]);
Tree.AddNode('ei', [4, 5]);
Tree.AddNode('bee');
Tree.AddNode('si');
Tree.AddNode('dee');
Tree.AddNode('y', [6]);
Tree.AddNode('eff');
Vis(Tree);
{$IFNDEF UNIX} readln; {$ENDIF}
end.</lang>
{{out}}
<pre>┐root
├─┐ei
│ ├──dee
│ └─┐y
│ └──eff
├──bee
└──si</pre>
=={{header|Elena}}==
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