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// Copyright (c) 2008-2018 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.

#ifndef PSFASTXML_PSFASTXML_H
#define PSFASTXML_PSFASTXML_H

#include "foundation/PxSimpleTypes.h" // defines basic data types; modify for your platform as needed.
#include "foundation/PxIO.h"
#include "foundation/PxAssert.h"
#include "PsAllocator.h"

namespace physx
{
namespace shdfnd
{

class FastXml
{
	PX_NOCOPY(FastXml)

  public:
	class AttributePairs
	{
		int argc;
		const char** argv;

	  public:
		AttributePairs() : argc(0), argv(NULL)
		{
		}
		AttributePairs(int c, const char** v) : argc(c), argv(v)
		{
		}

		PX_INLINE int getNbAttr() const
		{
			return argc / 2;
		}

		const char* getKey(uint32_t index) const
		{
			PX_ASSERT((index * 2) < uint32_t(argc));
			return argv[index * 2];
		}

		const char* getValue(uint32_t index) const
		{
			PX_ASSERT((index * 2 + 1) < uint32_t(argc));
			return argv[index * 2 + 1];
		}

		const char* get(const char* attr) const
		{
			int32_t count = argc / 2;
			for(int32_t i = 0; i < count; ++i)
			{
				const char* key = argv[i * 2], *value = argv[i * 2 + 1];
				if(strcmp(key, attr) == 0)
					return value;
			}

			return NULL;
		}
	};

	/***
	* Callbacks to the user with the contents of the XML file properly digested.
	*/
	class Callback
	{
	  public:
		virtual ~Callback()
		{
		}
		virtual bool processComment(const char* comment) = 0; // encountered a comment in the XML

		// 'element' is the name of the element that is being closed.
		// depth is the recursion depth of this element.
		// Return true to continue processing the XML file.
		// Return false to stop processing the XML file; leaves the read pointer of the stream right after this close
		// tag.
		// The bool 'isError' indicates whether processing was stopped due to an error, or intentionally canceled early.
		virtual bool processClose(const char* element, uint32_t depth, bool& isError) = 0; // process the 'close'
		// indicator for a previously
		// encountered element

		// return true to continue processing the XML document, false to skip.
		virtual bool processElement(const char* elementName,    // name of the element
		                            const char* elementData,    // element data, null if none
		                            const AttributePairs& attr, // attributes
		                            int32_t lineno) = 0;        // line number in the source XML file

		// process the XML declaration header
		virtual bool processXmlDeclaration(const AttributePairs&, // attributes
		                                   const char* /*elementData*/, int32_t /*lineno*/)
		{
			return true;
		}

		virtual bool processDoctype(const char* /*rootElement*/, // Root element tag
		                            const char* /*type*/,        // SYSTEM or PUBLIC
		                            const char* /*fpi*/,         // Formal Public Identifier
		                            const char* /*uri*/)         // Path to schema file
		{
			return true;
		}

		virtual void* allocate(uint32_t size)
		{
			return getAllocator().allocate(size, "FastXml", __FILE__, __LINE__);
		}

		virtual void deallocate(void* ptr)
		{
			getAllocator().deallocate(ptr);
		}
	};

	virtual bool processXml(PxInputData& buff, bool streamFromMemory = false) = 0;

	virtual const char* getError(int32_t& lineno) = 0; // report the reason for a parsing error, and the line number
	// where it occurred.

	FastXml()
	{
	}

	virtual void release(void) = 0;

  protected:
	virtual ~FastXml()
	{
	}
};

FastXml* createFastXml(FastXml::Callback* iface);

} // shdfnd
} // physx

#endif // PSFASTXML_PSFASTXML_H