/*
  Xeromyces file-loading interface.
  Automatically creates and caches relatively
  efficient binary representations of XML files.
*/

#ifndef INCLUDED_XEROMYCES
#define INCLUDED_XEROMYCES

#include "ps/Errors.h"
ERROR_GROUP(Xeromyces);
ERROR_TYPE(Xeromyces, XMLOpenFailed);
ERROR_TYPE(Xeromyces, XMLParseError);

#include "XeroXMB.h"
#include "ps/CVFSFile.h"

class CXeromyces : public XMBFile
{
    friend class TestXeromyces;
public:
    CXeromyces();
    ~CXeromyces();

    // Load from an XML file (with invisible XMB caching).
    PSRETURN Load(const char* filename);

    // Call once when shutting down the program, to unload Xerces.
    static void Terminate();

private:

    // Find out write location of the XMB file corresponding to xmlFilename
    static void GetXMBPath(const char* xmlFilename, const char* xmbFilename,
        char* xmbPath);

    bool ReadXMBFile(const char* filename);

    XMBFile* XMB;
    CVFSFile* XMBFileHandle; // if it's being read from disk
    char* XMBBuffer; // if it's being read from RAM

    static int XercesLoaded; // for once-only initialisation
};


#define _XERO_MAKE_UID2__(p,l) p ## l
#define _XERO_MAKE_UID1__(p,l) _XERO_MAKE_UID2__(p,l)

#define _XERO_CHILDREN _XERO_MAKE_UID1__(_children_, __LINE__)
#define _XERO_I _XERO_MAKE_UID1__(_i_, __LINE__)

#define XERO_ITER_EL(parent_element, child_element)                 \
    XMBElementList _XERO_CHILDREN = parent_element.GetChildNodes(); \
    XMBElement child_element (0);                                   \
    for (int _XERO_I = 0;                                           \
         _XERO_I < _XERO_CHILDREN.Count                             \
            && (child_element = _XERO_CHILDREN.Item(_XERO_I), 1);   \
         ++_XERO_I)

#define XERO_ITER_ATTR(parent_element, attribute)                       \
    XMBAttributeList _XERO_CHILDREN = parent_element.GetAttributes();   \
    XMBAttribute attribute;                                             \
    for (int _XERO_I = 0;                                               \
         _XERO_I < _XERO_CHILDREN.Count                                 \
            && (attribute = _XERO_CHILDREN.Item(_XERO_I), 1);           \
         ++_XERO_I)

#endif // INCLUDED_XEROMYCES