unit YZXMLParser;

interface

uses
  SysUtils, ComCtrls;

type
  THashElement = record
    Key, Value: string;
  end;

type
  THashElementArr = array of THashElement;

type
  THash = class(TObject)
  private
    Arr: THashElementArr;
    function GetValue(Key: string): string;
    procedure SetValue(Key: string; const VValue: string);
    function GetKeys: StrArr;
    function GetValues: StrArr;
    function GetCount: Integer;
    function Getempty: Boolean;
  public
    property Value[Key: string]: string read GetValue write SetValue; default;
    property Values: StrArr read GetValues;
    property Keys: StrArr read GetKeys;
    property Count: Integer read GetCount;
    property Empty: Boolean read Getempty;
    procedure Clear;
    constructor Create;
    destructor Destroy; override;
  end;

  TYZHash = THash;


type

  TYZXMLMarker = (xmlOpenTag, xmlCloseTagShort, xmlCloseTag, xmlCloseTagLong,
    xmlEOF, xmlIdentifier, xmlunknown);

  TYZXMLTag = class;
  TYZXMLTags = array of TYZXMLTag;

  TYZXMLTag = class(TObject)
  private
    FData: TYZHash;
    FParent: TYZXMLTag;
    FName: string;

    function GetValue(AName: string): string;
    procedure SetName(const Value: string);
    procedure SetValue(AName: string; const Value: string);
    function GetCount: Integer;
    function GetValueNames: strarr;

  public
    Children: TYZXMLTags;
    Text: string;


    property Name: string read FName write SetName;
    property Values[AName: string]: string read GetValue write SetValue;
    property ValueNames: strarr read GetValueNames;
    property Count: Integer read GetCount;

    function SkipSpaces(var AData: string; var APos: Integer;
      RememberBreaks: Boolean = False): Char;

    function ParseValue(var AData: string; var APos: Integer): Boolean;
    function ParseName(var AData: string; var APos: Integer): Boolean;

    function ParseString(var AData: string; var APos: Integer;
      RememberBreaks: Boolean = False): string;
    function ParseQuotedString(var AData: string; var APos: Integer;
      QIndef: Char = '"'): string;

    function WhatNext(var AData: string; var APos: Integer;
      var ANext: Integer; RememberBreaks: Boolean = False): TYZXMLMarker;

    function ParseXML(var AData: string; var APos: Integer): Boolean;

    function GenerateXML(var AData: string; ATab: string = ''): Boolean;

    function CharAt(var S: string; APos: Integer): Char;


    function TagNameExists(AName: string): Boolean;

    function AddChild: TYZXMLTag;

    procedure Clear; virtual;

    constructor Create(AParent: TYZXMLTag); virtual;
    destructor Destroy; virtual;
  end;


type
  TYZXMLParser = class(TYZXMLTag)
  private
    Header: TYZHash;
    procedure _BuildTreeView(ATreeView: TTreeView; ANode: TTreeNode; ATag: TYZXMLTag);
  public
    property HeaderValues: TYZHash read Header;

    procedure BuildTreeView(ATreeView: TTreeView);
    function Parse(AData: string): Boolean;
    function Generate(var AData: string): Boolean;
    constructor Create;
    destructor Destroy;
  end;

implementation

//================================================

{ TYZXMLTag }

function TYZXMLTag.AddChild: TYZXMLTag;
begin
  setlength(children, Length(children) + 1);
  Result := TYZXMLTag.Create(Self);
  children[Length(children) - 1] := Result;
end;

//--------------------------------------------------

procedure TYZXMLTag.Clear;
var
  i: Integer;
begin
  for i := 0 to Count - 1 do if children[i] <> nil then Children[i].Destroy;
  setlength(children, 0);
  FData.Clear;
  Text := '';
end;

//--------------------------------------------------

constructor TYZXMLTag.Create(AParent: TYZXMLTag);
begin
  inherited Create;
  FData := TYZHash.Create;
  FParent := AParent;
  Clear;
end;

//--------------------------------------------------

destructor TYZXMLTag.Destroy;
begin
  Clear;
  FData.Destroy;
end;

//-------------------------------------------------

function TYZXMLTag.GetCount: Integer;
begin
  Result := Length(children);
end;

//-------------------------------------------------

function TYZXMLTag.GetValue(AName: string): string;
begin
  Result := FData[AName];
end;

//-------------------------------------------------

function TYZXMLTag.ParseName(var AData: string; var APos: Integer): Boolean;
begin
  Result := False;
  FName := ParseString(AData, APos);
  if fname = '' then Exit;
  Result := True;
end;

//-------------------------------------------------

function TYZXMLTag.ParseQuotedString(var AData: string; var APos: Integer;
  QIndef: Char = '"'): string;
var
  i: Integer;
  skipnext: Boolean;
  z: Char;
begin
  Result := '';
  if CharAt(AData, APos) <> QIndef then Exit;
  i := apos;
  skipnext := True;
  repeat
    if not skipnext then
    begin
      if charat(AData, I) = '\' then SkipNext := True
      else
      begin
        z := charat(AData, I);
        if (Z = QIndef) or (z = #0) then
        begin
          Result := Copy(AData, aPos + 1, I - APos - 1);
          // result:=exch(result,'\','');
          APos := I + 1;
          Exit;
        end;
      end;
    end
    else
      skipnext := False;
    Inc(i);
  until False;
end;

//--------------------------------------------------

function TYZXMLTag.ParseString(var AData: string; var APos: Integer;
  RememberBreaks: Boolean = False): string;
const
  extsym: string = '=<>;?*/';
var
  nxt: Char;
  x1, x2, i: Integer;
begin
  Result := '';
  nxt := SkipSpaces(AData, APos, RememberBreaks);
  if nxt = #0 then Exit;
  if (nxt = '"') or (nxt = '''') then
  begin
    Result := ParseQuotedString(AData, APos);
    Exit;
  end;
  x1 := APos;
  i := x1;
  nxt := CharAt(AData, i);
  while ((Ord(nxt) <= 32) or (Pos(nxt, extsym) > 0)) and (nxt <> #0) do
  begin
    Inc(i);
    nxt := CharAt(AData, i);
  end;
  APos := i;
  X1 := APos;
  while (Ord(nxt) > 32) and (Pos(nxt, extsym) <= 0) do
  begin
    Inc(i);
    nxt := CharAt(AData, i);
  end;
  x2 := i - x1;
  Result := Copy(AData, x1, x2);
  APos := i;
end;

//--------------------------------------------------

function TYZXMLTag.ParseValue(var AData: string; var APos: Integer): Boolean;
var
  n, v: string;
  i, x: Integer;
begin
  Result := False;
  n := parseString(AData, APos);
  if n = '' then Exit;
  if skipspaces(AData, APos) <> '=' then Exit;
  Inc(apos);
  V := parseString(AData, APos);
  fdata[n] := dequote(v);
  Result := True;
end;

//---------------------------------------------------

function TYZXMLTag.ParseXML(var AData: string; var APos: Integer): Boolean;
var
  N: TYZXMLMarker;
  nxt: Integer;
  isLong: Boolean;
  inTag: Boolean;
begin
  isLong := False;
  Result := False;
  Clear;
  if WhatNext(AData, APos, nxt) <> xmlOpenTag then Exit;
  APos := nxt;
  if WhatNext(AData, APos, nxt) <> xmlIdentifier then Exit;
  Result := ParseName(AData, APos);
  if not Result then Exit;
  intag := True;
  Result := False;
  while True do
  begin
    N := WhatNext(AData, APos, nxt, (not intag and islong and (Count > 0)));
    case N of
      xmlEOF: Exit;
      xmlCloseTagLong:
        begin
          Result := True;
          if islong then APos := nxt;
          if (Text <> '') and (Count > 0) then
          begin
            Text := exch(Text, #13#10#13#10, #13#10);
          end;

          Exit;
        end;
      xmlCloseTagShort:
        begin
          Result := (not IsLong) and intag;
          if Result then APos := nxt;
          Exit;
        end;
      xmlOpenTag:
        begin
          if islong then Result := AddChild.ParseXML(AData, APos)
          else
          begin
            Result := False;
            Exit;
          end;
          if not Result then Exit;
        end;
      xmlCloseTag:
        begin
          IsLong := True;
          APos := nxt;
          intag := False;
        end;
      xmlIdentifier:
        begin
          if intag then parsevalue(AData, APos)
          else
            Text := Text + ParseString(AData, APos, True)
        end;
      xmlUnknown:
        begin
          Result := True;
          Exit;
        end;
    end;
  end;
end;

//--------------------------------------------------

procedure TYZXMLTag.SetName(const Value: string);
begin
  FName := Value;
end;

//---------------------------------------------------

procedure TYZXMLTag.SetValue(AName: string; const Value: string);
begin
  FData[AName] := Value;
end;

//----------------------------------------------------

function TYZXMLTag.SkipSpaces(var AData: string; var APos: Integer;
  RememberBreaks: Boolean = False): Char;
var
  L: Integer;
  P: Char;
begin
  L := Length(AData);
  while APos <= L do
  begin
    P := AData[APos];
    if Ord(p) > 32 then
    begin
      Result := p;
      Exit;
    end
    else if rememberbreaks then
    begin
      if Pos(p, #13#9' ') > 0 then
        Text := Text + ' ';
    end;
    Inc(APos);
  end;
  Result := #0;
end;

//---------------------------------------------------

function TYZXMLTag.CharAt(var S: string; APos: Integer): Char;
begin
  Result := #0;
  if (Length(s) < APos) or (apos < 1) then Exit;
  Result := s[APos];
end;

//-----------------------------------------------------

function TYZXMLTag.WhatNext(var AData: string; var APos: Integer;
  var ANext: Integer; RememberBreaks: Boolean = False): TYZXMLMarker;
var
  s: string;
  C: Char;
  P: Integer;
begin
  Result := xmlEOF;
  P := APos;
  C := SkipSpaces(AData, APos);
  P := APos;
  ANext := P;
  if C = #0 then Exit;

  if C = '<' then if CharAt(AData, P + 1) = '/' then
    begin
      Inc(P, 2);
      s := parsestring(AData, P);
      if (uppercase(s) = uppercase(FName)) and (SkipSpaces(AData, P) = '>') then
      begin
        ANext := P + 1;
        Result := xmlCloseTagLong;
        Exit;
      end
      else
      begin
        if TagNameExists(s) then
        begin
          Result := xmlCloseTagLong;
          ANext := APos;
          Exit;
        end;
        ANext := P + 1;
        Result := xmlCloseTagLong;
        Exit;
      end;
    end;

  if C = '<' then
  begin
    ANext := P + 1;
    Result := xmlOpenTag;
    Exit;
  end;

  if C = '>' then
  begin
    ANext := P + 1;
    Result := xmlCloseTag;
    Exit;
  end;
  if C = '/' then if CharAt(AData, P + 1) = '>' then
    begin
      ANext := P + 2;
      Result := xmlCloseTagShort;
      Exit;
    end;
  ANext := P;
  parsestring(AData, ANext);
  Result := xmlIdentifier;
end;

//-----------------------------------------------

function TYZXMLTag.GetValueNames: strarr;
begin
  Result := FData.Keys;
end;

//------------------------------------------------

function TYZXMLTag.GenerateXML(var AData: string; ATab: string = ''): Boolean;
var
  valDelimiter: string;
  spc: string;
  i: Integer;
  a: strarr;
begin
  spc := ATab + #9;
  if FData.Count < 5 then valDelimiter := ' '
  else
    valDelimiter := #13#10 + spc;
  AData := AData + #13#10 + ATab + '<' + FName;
  a := FData.keys;
  for i := 0 to Length(a) - 1 do
  begin
    AData := AData + valDelimiter + a[i] + ' = "' + EnQuote(values[a[i]]) + '"';
  end;
  if (Count > 0) or (Text <> '') then
  begin
    AData := AData + '>' + Text;
    for i := 0 to Count - 1 do
    begin
      Children[i].GenerateXML(AData, ATab + #9);
    end;
    AData := AData + #13#10 + ATab + '</' + FName + '>';
  end
  else
    AData := AData + '/>';
  Result := True;
end;

//--------------------------------------------------

function TYZXMLTag.TagNameExists(AName: string): Boolean;
begin
  Result := AnsiUpperCase(AName) = AnsiUpperCase(Self.FName);
  if Self.FParent = nil then Exit;
  if not Result then Result := fparent.TagNameExists(AName);
end;

//==================================================


{ TYZXMLParser }

constructor TYZXMLParser.Create;
begin
  Header := TYZHash.Create;
  inherited Create(nil);
end;

//--------------------------------------------------

destructor TYZXMLParser.Destroy;
begin
  inherited;
  Header.Destroy;
end;

//---------------------------------------------------

procedure TYZXMLParser.BuildTreeView(ATreeView: TTreeView);
var
  i: Integer;
begin
  // clear;
  ATreeView.Items.Clear;
  for i := 0 to Count - 1 do _BuildTreeView(ATreeView, nil, children[i]);
end;

//---------------------------------------------------

procedure TYZXMLParser._BuildTreeView(ATreeView: TTreeView; ANode: TTreeNode;
  ATag: TYZXMLTag);
var
  i: Integer;
  N: TTreeNode;
begin
  N := ATreeView.Items.AddChildObject(ANode, ATag.Name + ' ' + FData['ID'], Pointer(ATag));
  for i := 0 to ATag.Count - 1 do
  begin
    if ATag.children[i] <> nil then _BuildTreeView(ATreeView, N, ATag.children[i])
    else
      ATreeView.Items.AddChild(N, 'nil');
  end;
  N.Expanded := True;
end;

//----------------------------------------------------

function TYZXMLParser.Parse(AData: string): Boolean;
var
  x1, x2, X, i: Integer;
  s: string;
  tmp: TYZXMLTag;
  a: strarr;
  N: TYZXMLMarker;
begin
  X := 1;
  Self.SkipSpaces(AData, X);
  x2 := -1;
  Result := False;
  Clear;
  Header.Clear;
  x1 := Pos('<?', AData);
  if x1 >= X then
  begin
    x2 := Pos('?>', AData);
    if x2 < X then Exit;
    s := uppercase(Copy(AData, x1 + 2, 4));
    if Pos('XML ', s) <> 1 then Exit;
    s := '<xml ' + Copy(AData, x1 + 6, x2 - x1 - 6) + '/>';
    tmp := TYZXMLTag.Create(nil);
    tmp.ParseXML(s, x);
    a := tmp.ValueNames;
    for i := 0 to Length(a) - 1 do
      Header[a[i]] := tmp.Values[a[i]];
    tmp.Destroy;
    x := x2 + 2;
  end;
  Result := True;
  repeat
    N := whatnext(AData, X, x1);
    case N of
      xmlOpenTag: Result := Result and AddChild.ParseXML(AData, X);
      xmlIdentifier:
        begin
          if Text <> '' then Text := Text + ' ';
          Text := Text + parsestring(AData, X, True);
        end;
      else
        Parsestring(AData, X);
    end;
  until skipspaces(adata, x) = #0;
  // if not result then ShowMessage('Error Parsing: '+inttostr(X));
end;



function TYZXMLParser.Generate(var AData: string): Boolean;
var
  i: Integer;
  a: strarr;
begin
  Header['Date'] := DateTimeToStr(now);
  a := header.Keys;

  AData := '<?xml';
  for i := 0 to Length(a) - 1 do
    AData := AData + ' ' + a[i] + '="' + Header[a[i]] + '"';

  AData := AData + '?>'#13#10 + Text;
  Result := True;
  for i := 0 to Length(children) - 1 do
  begin
    Result := Result and children[i].generatexml(AData);
  end;
end;

//================================================


// процедуры класса THash


//================================================

{THASH CLASS}


procedure THash.Clear;
begin
  SetLength(Arr, 0);
end;

constructor THash.Create;
begin
  inherited;
  Clear;
end;

//------------------------------------------------

destructor THash.Destroy;
begin
  Clear;
  inherited;
end;

//-----------------------------------------------

function THash.GetCount: Integer;
begin
  Result := Length(Arr);
end;

//----------------------------------------------

function THash.Getempty: Boolean;
begin
  Result := Length(Arr) = 0;
end;

function THash.GetKeys: StrArr;
var
  i: Integer;
begin
  SetLength(Result, Length(arr));
  for i := 0 to Length(Result) - 1 do
    Result[i] := arr[i].Key;
end;

//----------------------------------------------

function THash.GetValue(Key: string): string;
var
  i: Integer;
  r: Boolean;
begin
  Result := '';
  i := 0;
  r := False;
  while (i < Length(Arr)) and (not r) do
  begin
    if AnsiUpperCase(arr[i].key) = AnsiUpperCase(Key) then
    begin
      Result := Arr[i].Value;
      r := True;
    end;
    i := i + 1;
  end;
end;

//---------------------------------------------

function THash.GetValues: StrArr;
var
  i: Integer;
begin
  SetLength(Result, Length(arr));
  for i := 0 to Length(Result) - 1 do
    Result[i] := arr[i].Value;
end;

//--------------------------------------------

procedure THash.SetValue(Key: string; const VValue: string);
var
  i, j: Integer;
  r: Boolean;
  E: THashElementArr;
begin
  if VValue <> '' then
  begin
    i := 0;
    r := False;
    while (i < Length(Arr)) and not r do
    begin
      if AnsiUpperCase(arr[i].key) = AnsiUpperCase(Key) then
      begin
        Arr[i].Value := VValue;
        r := True;
      end;
      i := i + 1;
    end;
    if not r then
    begin
      SetLength(Arr, Length(arr) + 1);
      arr[Length(arr) - 1].Key := Key;
      arr[Length(arr) - 1].Value := Vvalue;
    end;
  end;

  SetLength(E, Length(Arr));
  for i := 0 to Length(arr) - 1 do E[i] := Arr[i];
  SetLength(arr, 0);
  for i := 0 to Length(E) - 1 do if (E[i].Key <> '') and (E[i].Value <> '') then
    begin
      j := Length(arr);
      setlength(arr, j + 1);
      arr[j] := E[i];
    end;
end;

end.