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/***************************************************************************

    plaparse.h

    Parser for Berkeley standard PLA files into raw fusemaps.

****************************************************************************

    Copyright Aaron Giles
    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 'MAME' 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 AARON GILES ''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 AARON GILES 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.

***************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "jedparse.h"
#include "plaparse.h"



/***************************************************************************
    DEBUGGING
***************************************************************************/

#define LOG_PARSE       0



/***************************************************************************
    TYPE DEFINITIONS
***************************************************************************/

struct parse_info
{
	UINT32  inputs;
	UINT32  outputs;
	UINT32  terms;
};



/***************************************************************************
    UTILITIES
***************************************************************************/

/*-------------------------------------------------
    iscrlf - is a line feed character
-------------------------------------------------*/

static int iscrlf(char c)
{
	return (c == 13 || c == 10);
}


/*-------------------------------------------------
    suck_number - read a decimal value from the
    character stream
-------------------------------------------------*/

static UINT32 suck_number(const UINT8 **psrc)
{
	const UINT8 *src = *psrc;
	UINT32 value = 0;

	// loop over and accumulate digits
	while (isdigit(*src))
	{
		value = value * 10 + *src - '0';
		src++;
	}

	// return a pointer to the string afterwards
	*psrc = src;
	return value;
}



/***************************************************************************
    CORE IMPLEMENTATION
***************************************************************************/

/*-------------------------------------------------
    process_field - process a single field
-------------------------------------------------*/

static void process_field(jed_data *data, const UINT8 *cursrc, const UINT8 *srcend, parse_info *pinfo)
{
	cursrc++;

	// switch off of the field type
	switch (*cursrc)
	{
		// number of inputs
		case 'i':
			cursrc += 2;
			pinfo->inputs = suck_number(&cursrc);
			if (LOG_PARSE) printf("Inputs: %u\n", pinfo->inputs);
			break;

		// number of outputs
		case 'o':
			cursrc += 2;
			pinfo->outputs = suck_number(&cursrc);
			if (LOG_PARSE) printf("Outputs: %u\n", pinfo->outputs);
			break;

		// number of product terms
		case 'p':
		{
			cursrc += 2;
			pinfo->terms = suck_number(&cursrc);
			if (LOG_PARSE) printf("Terms: %u\n", pinfo->terms);

			UINT32 curfuse = 0;
			bool outputs = false;

			cursrc++;
			while (cursrc < srcend && *cursrc != '.')
			{
				switch (*cursrc)
				{
				case '-':
					if (!outputs)
					{
						jed_set_fuse(data, curfuse++, 1);
						jed_set_fuse(data, curfuse++, 1);

						if (LOG_PARSE) printf("11");
					}
					break;

				case '1':
					if (outputs)
					{
						jed_set_fuse(data, curfuse++, 0);

						if (LOG_PARSE) printf("0");
					}
					else
					{
						jed_set_fuse(data, curfuse++, 1);
						jed_set_fuse(data, curfuse++, 0);

						if (LOG_PARSE) printf("10");
					}
					break;

				case '0':
					if (outputs)
					{
						jed_set_fuse(data, curfuse++, 1);

						if (LOG_PARSE) printf("1");
					}
					else
					{
						jed_set_fuse(data, curfuse++, 0);
						jed_set_fuse(data, curfuse++, 1);

						if (LOG_PARSE) printf("01");
					}
					break;

				case ' ':
					outputs = true;
					if (LOG_PARSE) printf(" ");
					break;
				}

				if (iscrlf(*cursrc) && outputs)
				{
					outputs = false;
					if (LOG_PARSE) printf("\n");
				}

				cursrc++;
			}

			data->numfuses = curfuse;
			break;
		}

		// end of file
		case 'e':
			printf("End of file\n");
			break;
	}

	cursrc++;
}



/*-------------------------------------------------
    pla_parse - parse a Berkeley standard PLA file
    that has been loaded raw into memory
-------------------------------------------------*/

int pla_parse(const void *data, size_t length, jed_data *result)
{
	const UINT8 *cursrc = (const UINT8 *)data;
	const UINT8 *srcend = cursrc + length;
	const UINT8 *scan;
	parse_info pinfo;

	result->numfuses = 0;
	memset(result->fusemap, 0x00, sizeof(result->fusemap));

	while (cursrc < srcend)
	{
		if (*cursrc == '#')
		{
			cursrc++;
			while (cursrc < srcend && !iscrlf(*cursrc))
				cursrc++;
		}
		else if (*cursrc == '.')
		{
			scan = cursrc;
			while (scan < srcend && !iscrlf(*scan))
				scan++;
			if (scan >= srcend)
				return JEDERR_INVALID_DATA;

			process_field(result, cursrc, srcend, &pinfo);

			cursrc = scan + 1;
		}

		cursrc++;
	}

	return JEDERR_NONE;
}