/*
Copyright (c) 2016, Blue Brain Project
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
2. 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.
3. Neither the name of the copyright holder 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 THE COPYRIGHT HOLDER OR CONTRIBUTORS 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 "nmodlconf.h"
/* /local/src/master/nrn/src/nmodl/discrete.c,v 4.1 1997/08/30 20:45:19 hines Exp */
/*
discrete.c,v
 * Revision 4.1  1997/08/30  20:45:19  hines
 * cvs problem with branches. Latest nmodl stuff should now be a top level
 *
 * Revision 4.0.1.1  1997/08/08  17:23:42  hines
 * nocmodl version 4.0.1
 *
 * Revision 4.0  1997/08/08  17:06:07  hines
 * proper nocmodl version number
 *
 * Revision 1.1.1.1  1994/10/12  17:21:35  hines
 * NEURON 3.0 distribution
 *
 * Revision 9.5  90/07/18  07:59:36  hines
 * define for arrays now (p + n) instead of &p[n]. This allows the c file
 * to have arrays that look like a[i] instead of *(a + i).
 * 
 * Revision 8.1  90/01/03  16:13:01  mlh
 * discrete array variables had their for loops switched.
 * 
 * Revision 8.0  89/09/22  17:26:05  nfh
 * Freezing
 * 
 * Revision 7.0  89/08/30  13:31:32  nfh
 * Rev 7 is now Experimental; Rev 6 is Testing
 * 
 * Revision 6.0  89/08/14  16:26:16  nfh
 * Rev 6.0 is latest of 4.x; now the Experimental version
 * 
 * Revision 4.0  89/07/24  17:02:45  nfh
 * Freezing rev 3.  Rev 4 is now Experimental
 * 
 * Revision 3.3  89/07/21  09:28:14  mlh
 * Discrete equitions evaluated at time given by independent variable
 * in the sense that the state on the left hand side refers to state(t)
 * and explicit dependence on t works naturally.
 * 
 * Revision 1.3  89/07/21  09:14:08  mlh
 * Discrete equations evaluated at time given by ndependent variable
 * in the sense that state on the left hand side refers to state(t)
 * and explicit dependence on t works naturally.  This is done by
 * incrementing t before calling discrete block and updating the
 * history at the beginning instead of the end.
 * 
 * Revision 1.2  89/07/12  13:57:21  mlh
 * state@1 now refers to fianl value at previous step
 * state@0 is a syntax error
 * 
 * Revision 1.1  89/07/06  14:48:27  mlh
 * Initial revision
 * 
*/

#include <stdlib.h>
#include "modl.h"
#include "parse1.h"
#include "symbol.h"

void disc_var_seen(q1, q2, q3, array)	/*NAME '@' NUMBER --- array flag*/
	Item *q1, *q2, *q3;
	int array;
{
	Symbol *s;
	int num;
	
	num = atoi(STR(q3));
	s = SYM(q1);
	if (num < 1) {
		diag("Discrete variable must have @index >= 1", (char *)0);
	}  
	num--;
	if (!(s->subtype & STAT)) {
	diag(s->name, " must be a STATE for use as discrete variable");
	}
	if (array && !(s->subtype & ARRAY)) {
		diag(s->name, " must be a scalar discrete variable");
	}
	if (!array && (s->subtype & ARRAY)) {
		diag(s->name, " must be an array discrete variable");
	}
	if (s->discdim <= num) {
		s->discdim = num+1;
	}
	Sprintf(buf, "__%s", s->name);
	replacstr(q1, buf);
	delete(q2);
	Sprintf(buf, "[%d]", num);
	replacstr(q3, buf);
}

void massagediscblk(q1, q2, q3, q4) /*DISCRETE NAME stmtlist '}'*/
	Item *q1, *q2, *q3, *q4;
{
	int i;
	Symbol *s;
	Item *qs;
	
	replacstr(q1, "int");
	Insertstr(q3, "()\n{\n");
	Insertstr(q4, "}\n");
	SYM(q2)->subtype |= DISCF;
	SYMITER(NAME) if (s->subtype & STAT && s->used && s->discdim) {
		if (s->subtype & ARRAY) {
Sprintf(buf, "{int _i, _j; for (_j=%d; _j >=0; _j--) {\n\
for (_i=%d; _i>0; _i--) __%s[_i][_j] = __%s[_i-1][_j];\n\
 __%s[0][_j] = %s[_j];\n\
}}\n",
			s->araydim -1,
			s->discdim -1, s->name, s->name, s->name, s->name);
		}else{
Sprintf(buf, "{int _i; for (_i=%d; _i>0; _i--) __%s[_i] = __%s[_i-1];\n\
 __%s[0] = %s;\n}\n",
			s->discdim -1, s->name, s->name, s->name, s->name);
		}
		Insertstr(q3, buf);
		s->used = 0;
	}
	/*initialization and declaration done elsewhere*/
	movelist(q1, q4, procfunc);
}

void init_disc_vars()
{
	int i;
	Item *qs;
	Symbol *s;
	SYMITER(NAME) if (s->subtype & STAT && s->discdim) {
		if (s->subtype & ARRAY) {
Sprintf(buf, "{int _i, _j; for (_j=%d; _j >=0; _j--) {\n\
for (_i=%d; _i>=0; _i--) __%s[_i][_j] = %s0;}}\n",
			s->araydim -1,
			s->discdim -1, s->name, s->name);
			Linsertstr(initfunc, buf);
Sprintf(buf, "static double __%s[%d][%d];\n", s->name, s->discdim, s->araydim);
			Linsertstr(procfunc, buf);
		}else{
Sprintf(buf, "{int _i; for (_i=%d; _i>=0; _i--) __%s[_i] = %s0;}\n",
			s->discdim -1, s->name, s->name);
			Linsertstr(initfunc, buf);
Sprintf(buf, "static double __%s[%d];\n", s->name, s->discdim);
			Linsertstr(procfunc, buf);
		}
	}
}




