Starts the EPS reader

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@1664 8e941d3f-bd1b-0410-a28a-d453659cc2b4

applications/fpvviewer/fpvectorialsrc/epsvectorialreader.pas

@@ -0,0 +1,203 @@
+{
+Reads EPS files
+
+License: The same modified LGPL as the Free Pascal RTL
+         See the file COPYING.modifiedLGPL for more details
+
+AUTHORS: Felipe Monteiro de Carvalho
+
+}
+unit epsvectorialreader;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, Math,
+  fpvectorial, fpimage;
+
+type
+  TPSTokenType = (ttComment, ttFloat);
+
+  TPSTokens = TFPList;// TPSToken;
+
+  TPSToken = class
+    StrValue: string;
+    FloatValue: double;
+    IntValue: Integer;
+    Childs: TPSTokens;
+  end;
+
+  TCommentToken = class(TPSToken)
+  end;
+
+  TPostScriptScannerState = (ssSearchingToken, ssInComment);
+
+  { TPSTokenizer }
+
+  TPSTokenizer = class
+  public
+    Tokens: TPSTokens;
+    constructor Create;
+    destructor Destroy; override;
+    procedure ReadFromStream(AStream: TStream);
+    procedure DebugOut();
+    function IsValidPostScriptChar(AChar: Byte): Boolean;
+  end;
+
+  { TvEPSFVectorialReader }
+
+  { TvEPSVectorialReader }
+
+  TvEPSVectorialReader = class(TvCustomVectorialReader)
+  private
+    FPointSeparator: TFormatSettings;
+  public
+    { General reading methods }
+    Tokenizer: TPSTokenizer;
+    constructor Create; override;
+    Destructor Destroy; override;
+    procedure ReadFromStream(AStream: TStream; AData: TvVectorialDocument); override;
+  end;
+
+implementation
+
+{ TPSTokenizer }
+
+constructor TPSTokenizer.Create;
+begin
+  inherited Create;
+  Tokens := TPSTokens.Create;
+end;
+
+destructor TPSTokenizer.Destroy;
+begin
+  Tokens.Free;
+  inherited Destroy;
+end;
+
+{@@ Rules for parsing PostScript files:
+
+* Coments go from the first occurence of % outside a line to the next new line
+* The only accepted characters are printable ASCII ones, plus spacing ASCII chars
+  See IsValidPostScriptChar about that
+}
+procedure TPSTokenizer.ReadFromStream(AStream: TStream);
+var
+  i: Integer;
+  CurChar: Char;
+  State: TPostScriptScannerState = ssSearchingToken;
+  CommentToken: TCommentToken;
+begin
+  while AStream.Position < AStream.Size do
+  begin
+    CurChar := Char(AStream.ReadByte());
+    if not IsValidPostScriptChar(Byte(CurChar)) then
+      raise Exception.Create('[TPSTokenizer.ReadFromStream] Invalid char: ' + IntToHex(Byte(CurChar), 2));
+
+    case State of
+      { Searching for a token }
+      ssSearchingToken:
+      begin
+        case CurChar of
+          '%':
+          begin
+            CommentToken := TCommentToken.Create;
+            State := ssInComment;
+          end;
+        end;
+
+      end;
+
+      { Passing by comments }
+      ssInComment:
+      begin
+        CommentToken.StrValue := CommentToken.StrValue + CurChar;
+
+        case CurChar of
+          #13:
+          begin
+            // Check if this is a Windows-style #13#10 line end marker by getting one more char
+            if AStream.ReadByte() <> 10 then AStream.Seek(-1, soFromCurrent); // Go back if it wasnt a #13#10
+
+            Tokens.Add(CommentToken);
+            State := ssSearchingToken;
+          end;
+          #10:
+          begin
+            Tokens.Add(CommentToken);
+            State := ssSearchingToken;
+          end;
+        end; // case
+      end; // ssInComment
+
+    end; // case
+  end; // while
+end;
+
+procedure TPSTokenizer.DebugOut();
+var
+  i: Integer;
+  Token: TPSToken;
+begin
+  for i := 0 to Tokens.Count - 1 do
+  begin
+    Token := TPSToken(Tokens.Items[i]);
+
+    if Token is TCommentToken then
+    begin
+      WriteLn(Format('TCommentToken StrValue=%s', [Token.StrValue]));
+    end;
+  end;
+end;
+
+{@@ Valid PostScript Chars:
+
+All printable: a..zA..Z0..9
+
+Plus the following white spaces
+000 00 0 Null (nul)
+011 09 9 Tab (tab)
+012 0A 10 Line feed (LF)
+014 0C 12 Form feed (FF)
+015 0D 13 Carriage return (CR)
+040 20 32 Space (SP)
+}
+function TPSTokenizer.IsValidPostScriptChar(AChar: Byte): Boolean;
+begin
+  Result := ((AChar > 32) and (AChar < 127)) or (AChar in [0, 9, 10, 12, 13, 32]);
+end;
+
+{$ifndef Windows}
+{$define FPVECTORIALDEBUG}
+{$endif}
+
+{ TvEPSVectorialReader }
+
+constructor TvEPSVectorialReader.Create;
+begin
+  inherited Create;
+
+  Tokenizer := TPSTokenizer.Create;
+end;
+
+destructor TvEPSVectorialReader.Destroy;
+begin
+  Tokenizer.Free;
+  inherited Destroy;
+end;
+
+procedure TvEPSVectorialReader.ReadFromStream(AStream: TStream;
+  AData: TvVectorialDocument);
+begin
+  Tokenizer.ReadFromStream(AStream);
+  Tokenizer.DebugOut();
+end;
+
+initialization
+
+  RegisterVectorialReader(TvEPSVectorialReader, vfEncapsulatedPostScript);
+
+end.
+

applications/fpvviewer/fpvectorialsrc/fpvectorial.pas

@@ -24,9 +24,11 @@ uses
 type
   TvVectorialFormat = (
     { Multi-purpose document formats }
-    vfPDF, vfPostScript, vfSVG, vfCorelDrawCDR, vfWindowsMetafileWMF,
+    vfPDF, vfSVG, vfCorelDrawCDR, vfWindowsMetafileWMF,
     { CAD formats }
     vfDXF,
+    { Printing formats }
+    vfPostScript, vfEncapsulatedPostScript,
     { GCode formats }
     vfGCodeAvisoCNCPrototipoV5, vfGCodeAvisoCNCPrototipoV6);
 
@@ -39,6 +41,7 @@ const
   STR_CORELDRAW_EXTENSION = '.cdr';
   STR_WINMETAFILE_EXTENSION = '.wmf';
   STR_AUTOCAD_EXCHANGE_EXTENSION = '.dxf';
+  STR_ENCAPSULATEDPOSTSCRIPT_EXTENSION = '.eps';
 
 type
   {@@ We need our own format because TFPColor is too big for our needs and TColor has no Alpha }
@@ -1000,6 +1003,7 @@ begin
   else if AnsiCompareText(lExt, STR_CORELDRAW_EXTENSION) = 0 then Result := vfCorelDrawCDR
   else if AnsiCompareText(lExt, STR_WINMETAFILE_EXTENSION) = 0 then Result := vfWindowsMetafileWMF
   else if AnsiCompareText(lExt, STR_AUTOCAD_EXCHANGE_EXTENSION) = 0 then Result := vfDXF
+  else if AnsiCompareText(lExt, STR_ENCAPSULATEDPOSTSCRIPT_EXTENSION) = 0 then Result := vfEncapsulatedPostScript
   else
     raise Exception.Create('TvVectorialDocument.GetFormatFromExtension: The extension (' + lExt + ') doesn''t match any supported formats.');
 end;

applications/fpvviewer/fpvectorialsrc/fpvectorialpkg.lpk

@@ -11,7 +11,7 @@
         <CompilerPath Value="$(CompPath)"/>
       </Other>
     </CompilerOptions>
-    <Files Count="14">
+    <Files Count="15">
       <Item1>
         <Filename Value="svgvectorialwriter.pas"/>
         <UnitName Value="svgvectorialwriter"/>
@@ -66,8 +66,12 @@
       </Item13>
       <Item14>
         <Filename Value="svgvectorialreader.pas"/>
-        <UnitName Value="svgvectorialwriter"/>
+        <UnitName Value="svgvectorialreader"/>
       </Item14>
+      <Item15>
+        <Filename Value="epsvectorialreader.pas"/>
+        <UnitName Value="epsvectorialreader"/>
+      </Item15>
     </Files>
     <Type Value="RunAndDesignTime"/>
     <RequiredPkgs Count="2">

applications/fpvviewer/fpvectorialsrc/fpvectorialpkg.pas

@@ -10,7 +10,8 @@ uses
   svgvectorialwriter, pdfvrsintatico, pdfvrsemantico, pdfvrlexico, 
   pdfvectorialreader, fpvtocanvas, fpvectorial, fpvectbuildunit, 
   dxfvectorialreader, cdrvectorialreader, avisozlib, avisocncgcodewriter, 
-  avisocncgcodereader, svgvectorialreader, LazarusPackageIntf;
+  avisocncgcodereader, svgvectorialreader, epsvectorialreader, 
+  LazarusPackageIntf;
 
 implementation
 

applications/fpvviewer/fpvv_mainform.lfm

@@ -76,8 +76,8 @@ object frmFPVViewer: TfrmFPVViewer
     object pageViewer: TPage
     end
     object Page2: TPage
-      ClientWidth = 4224
+      ClientWidth = 8448
-      ClientHeight = 4992
+      ClientHeight = 9984
       object DXFTreeView: TTreeView
         Left = 8
         Height = 313

applications/fpvviewer/fpvv_mainform.pas

@@ -41,7 +41,7 @@ implementation
 
 uses
   fpvectorial, cdrvectorialreader, svgvectorialwriter, pdfvectorialreader,
-  dxfvectorialreader,
+  dxfvectorialreader, epsvectorialreader,
   fpvtocanvas,
   dxftokentotree;