src/object_writer.h

/*
	Copyright (c) 2012-2014, Santeri Piippo
	All rights reserved.

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions are met:

		* Redistributions of source code must retain the above copyright
		  notice, this list of conditions and the following disclaimer.

		* Redistributions in binary form must reproduce the above copyright
		  notice, this list of conditions and the following disclaimer in the
		  documentation and/or other materials provided with the distribution.

		* Neither the name of the <organization> nor the
		  names of its contributors may be used to endorse or promote products
		  derived from this software without specific prior written permission.

	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
	ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
	DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef BOTC_OBJWRITER_H
#define BOTC_OBJWRITER_H

#include <stdio.h>
#include <typeinfo>
#include <string.h>
#include "main.h"
#include "str.h"
#include "data_buffer.h"

class object_writer
{
public:
	// ====================================================================
	// MEMBERS

	// Pointer to the file we're writing to
	FILE* fp;

	// The main buffer - the contents of this is what we
	// write to file after parsing is complete
	data_buffer* MainBuffer;

	// onenter buffer - the contents of the onenter{} block
	// is buffered here and is merged further at the end of state
	data_buffer* OnEnterBuffer;

	// Mainloop buffer - the contents of the mainloop{} block
	// is buffered here and is merged further at the end of state
	data_buffer* MainLoopBuffer;

	// Switch buffer - switch case data is recorded to this
	// buffer initially, instead of into main buffer.
	data_buffer* SwitchBuffer;

	// How many bytes have we written to file?
	int numWrittenBytes;

	// How many references did we resolve in the main buffer?
	int numWrittenReferences;

	// ====================================================================
	// METHODS
	object_writer();
	void write_string (string s);
	void write_buffer (data_buffer* buf);
	void write_member_buffers();
	void write_string_table();
	void write_to_file (string filepath);
	data_buffer* get_current_buffer();

	int add_mark (string name);
	int find_byte_mark (string name);
	int add_reference (int mark);
	void move_mark (int mark);
	void offset_mark (int mark, int offset);
	void delete_mark (int mark);

	template <class T> void write (T stuff)
	{
		get_current_buffer()->write (stuff);
	}

private:
	// Write given data to file.
	template <class T> void write_data_to_file (T stuff)
	{
		// One byte at a time
		generic_union<T> uni;
		uni.as_t = stuff;

		for (int x = 0; x < sizeof (T); x++)
		{
			fwrite (&uni.as_bytes[x], 1, 1, fp);
			numWrittenBytes++;
		}
	}
};

#endif // BOTC_OBJWRITER_H