sdext/source/pdfimport/inc/treevisitorfactory.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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  19
  20 #ifndef INCLUDED_SDEXT_SOURCE_PDFIMPORT_INC_TREEVISITORFACTORY_HXX
  21 #define INCLUDED_SDEXT_SOURCE_PDFIMPORT_INC_TREEVISITORFACTORY_HXX
  22
  23 #include <memory>
  24
  25 namespace pdfi
  26 {
  27     struct ElementTreeVisitor;
  28     struct EmitContext;
  29     class PDFIProcessor;
  30     class StyleContainer;
  31
  32     /** Tree manipulation factory
  33
  34         Creates visitor objects performing various operations on the
  35         pdf parse tree
  36      */
  37     struct TreeVisitorFactory
  38     {
  39         virtual ~TreeVisitorFactory() {}
  40
  41         /// Create visitor that combines tree nodes
  42         virtual std::shared_ptr<ElementTreeVisitor> createOptimizingVisitor(PDFIProcessor&) const = 0;
  43         /// Create visitor that prepares style info
  44         virtual std::shared_ptr<ElementTreeVisitor> createStyleCollectingVisitor(
  45             StyleContainer&, PDFIProcessor&) const = 0;
  46         /// Create visitor that emits tree to an output target
  47         virtual std::shared_ptr<ElementTreeVisitor> createEmittingVisitor(EmitContext&) const = 0;
  48     };
  49
  50     typedef std::shared_ptr<TreeVisitorFactory> TreeVisitorFactorySharedPtr;
  51
  52     TreeVisitorFactorySharedPtr createWriterTreeVisitorFactory();
  53     TreeVisitorFactorySharedPtr createImpressTreeVisitorFactory();
  54     TreeVisitorFactorySharedPtr createDrawTreeVisitorFactory();
  55 }
  56
  57 #endif
  58
  59 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */