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Unary - (minus) is newly introduced, which obsolates [b_op,-,0,a].
quote(-a) is converted into [u_op,-,[internal,a]].
In the parser, a new identifier I_MINUS is introduced.

/*
 * Copyright (c) 1994-2000 FUJITSU LABORATORIES LIMITED 
 * All rights reserved.
 * 
 * FUJITSU LABORATORIES LIMITED ("FLL") hereby grants you a limited,
 * non-exclusive and royalty-free license to use, copy, modify and
 * redistribute, solely for non-commercial and non-profit purposes, the
 * computer program, "Risa/Asir" ("SOFTWARE"), subject to the terms and
 * conditions of this Agreement. For the avoidance of doubt, you acquire
 * only a limited right to use the SOFTWARE hereunder, and FLL or any
 * third party developer retains all rights, including but not limited to
 * copyrights, in and to the SOFTWARE.
 * 
 * (1) FLL does not grant you a license in any way for commercial
 * purposes. You may use the SOFTWARE only for non-commercial and
 * non-profit purposes only, such as academic, research and internal
 * business use.
 * (2) The SOFTWARE is protected by the Copyright Law of Japan and
 * international copyright treaties. If you make copies of the SOFTWARE,
 * with or without modification, as permitted hereunder, you shall affix
 * to all such copies of the SOFTWARE the above copyright notice.
 * (3) An explicit reference to this SOFTWARE and its copyright owner
 * shall be made on your publication or presentation in any form of the
 * results obtained by use of the SOFTWARE.
 * (4) In the event that you modify the SOFTWARE, you shall notify FLL by
 * e-mail at risa-admin@sec.flab.fujitsu.co.jp of the detailed specification
 * for such modification or the source code of the modified part of the
 * SOFTWARE.
 * 
 * THE SOFTWARE IS PROVIDED AS IS WITHOUT ANY WARRANTY OF ANY KIND. FLL
 * MAKES ABSOLUTELY NO WARRANTIES, EXPRESSED, IMPLIED OR STATUTORY, AND
 * EXPRESSLY DISCLAIMS ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF THIRD PARTIES'
 * RIGHTS. NO FLL DEALER, AGENT, EMPLOYEES IS AUTHORIZED TO MAKE ANY
 * MODIFICATIONS, EXTENSIONS, OR ADDITIONS TO THIS WARRANTY.
 * UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY, TORT, CONTRACT,
 * OR OTHERWISE, SHALL FLL BE LIABLE TO YOU OR ANY OTHER PERSON FOR ANY
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE OR CONSEQUENTIAL
 * DAMAGES OF ANY CHARACTER, INCLUDING, WITHOUT LIMITATION, DAMAGES
 * ARISING OUT OF OR RELATING TO THE SOFTWARE OR THIS AGREEMENT, DAMAGES
 * FOR LOSS OF GOODWILL, WORK STOPPAGE, OR LOSS OF DATA, OR FOR ANY
 * DAMAGES, EVEN IF FLL SHALL HAVE BEEN INFORMED OF THE POSSIBILITY OF
 * SUCH DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY. EVEN IF A PART
 * OF THE SOFTWARE HAS BEEN DEVELOPED BY A THIRD PARTY, THE THIRD PARTY
 * DEVELOPER SHALL HAVE NO LIABILITY IN CONNECTION WITH THE USE,
 * PERFORMANCE OR NON-PERFORMANCE OF THE SOFTWARE.
 *
 * $OpenXM: OpenXM_contrib2/asir2000/engine/num.c,v 1.5 2001/09/05 09:01:27 noro Exp $ 
*/
#include "ca.h"

void addnum(vl,a,b,c)
VL vl;
Num a,b,*c;
{
	(*addnumt[MAX(a?NID(a):0,b?NID(b):0)])(a,b,c);
}

void subnum(vl,a,b,c)
VL vl;
Num a,b,*c;
{
	(*subnumt[MAX(a?NID(a):0,b?NID(b):0)])(a,b,c);
}

void mulnum(vl,a,b,c)
VL vl;
Num a,b,*c;
{
	(*mulnumt[MAX(a?NID(a):0,b?NID(b):0)])(a,b,c);
}

void divnum(vl,a,b,c)
VL vl;
Num a,b,*c;
{
	(*divnumt[MAX(a?NID(a):0,b?NID(b):0)])(a,b,c);
}

void pwrnum(vl,a,b,c)
VL vl;
Num a,b,*c;
{
	(*pwrnumt[MAX(a?NID(a):0,b?NID(b):0)])(a,b,c);
}

void chsgnnum(a,c)
Num a,*c;
{
	(*chsgnnumt[a?NID(a):0])(a,c);
}

int compnum(vl,a,b)
VL vl;
Num a,b;
{
	return (*cmpnumt[MAX(a?NID(a):0,b?NID(b):0)])(a,b);
}

extern int current_ff;

void one_ff(c)
Num *c;
{
	LM lm;
	GFS fs;
	GFSN fspn;

	switch ( current_ff ) {
		case FF_GFP:
		case FF_GFPN:
			MKLM(ONEN,lm);
			*c = (Num)lm;
			break;
		case FF_GFS:
			mqtogfs(ONEM,&fs);
			*c = (Num)fs;
			break;
		case FF_GFSN:
			ntogfsn(ONE,&fspn);
			*c = (Num)fspn;
			break;
		default:
			error("one_ff : not implemented yet");
	}
}

int negative_number(c)
Num c;
{
	if ( !c )
		return 0;
	else {
		switch ( NID(c) ) {
			case N_Q:
				return SGN((Q)c)<0;
			case N_R:
				return BDY((Real)c)<0;
			case N_B:
				return 0; /* XXX */
			default:
				return 0;
		}
	}
}