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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
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#ifndef DocFormats_DFBDT_h
#define DocFormats_DFBDT_h

#include <DocFormats/DFXMLForward.h>

typedef DFNode *(*DFLookupConcreteFunction)(void *ctx, DFNode *abstract);

////////////////////////////////////////////////////////////////////////////////////////////////////
//                                                                                                //
//                                             DFLens                                             //
//                                                                                                //
////////////////////////////////////////////////////////////////////////////////////////////////////

typedef struct {

    /** Indicates whether the particular concrete element is of a type that is known to the program.
     For example, you would return true for paragraphs, but false for embedded spreadsheets. */
    int (*isVisible)(void *ctx, DFNode *concrete);

    /** Converts the node from a Word/ODF document into a HTML element */
    DFNode *(*get)(void *ctx, DFNode *concrete);

    /** Updates an existing node that is already in the Word/ODF document, based on the
     corresponding node in the HTML document */
    void (*put)(void *ctx, DFNode *abstract, DFNode *concrete);

    /** Called when we find a new node in the HTML document for which we have no corresponding
     node in the Word/ODF document yet. This could be because we are updating an existing Word/ODF
     document and new content has been added, or because we are creating a new Word/ODF document
     and thus don't have *any* nodes corresponding to parts of the HTML document. */
    DFNode *(*create)(void *ctx, DFNode *abstract);

    /** Removes a node from the concrete document, because it has been determined that the
     corresponding node in the HTML document was removed */
    void (*remove)(void *ctx, DFNode *concrete);

} DFLens;

DFNode *BDTContainerGet(void *ctx, DFLens *theLens, DFNode *abstract, DFNode *concrete);
void BDTContainerPut(void *ctx, DFLens *theLens, DFNode *abstract, DFNode *concrete,
                     DFLookupConcreteFunction lookupConcrete);

#endif