/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include "e.h"#include "y.tab.h" void subsup(int p1, int p2, int p3){	if (p2 != 0 && p3 != 0)		shift2(p1, p2, p3);	else if (p2 != 0)		bshiftb(p1, SUB, p2);	else if (p3 != 0)		bshiftb(p1, SUP, p3);} extern double Subbase, Supshift;extern char *Sub1space, *Sup1space, *Sub2space;extern char *SS1space, *SS2space; void bshiftb(int p1, int dir, int p2){	int subps, n;	double shval, d1, h1, b1, h2, b2;	char *sh1, *sh2; 	yyval = p1;	h1 = eht[p1];	b1 = ebase[p1];	h2 = eht[p2];	b2 = ebase[p2];	subps = ps;	ps += deltaps;	if (dir == SUB) {		/* base .2m below bottom of main box */		shval = b1 + EM(Subbase, ps);		ebase[yyval] = shval + b2;		eht[yyval] = max(h1-b1+shval+b2, h2);		if (rfont[p1] == ITAL && lfont[p2] == ROM)			n = 2;		/* Sub1space */		else			n = max(2, class[rclass[p1]][lclass[p2]]);		sh1 = pad(n);		rclass[p1] = OTHER;	/* OTHER leaves too much after sup */	} else {	/* superscript */		/* 4/10 up main box */		d1 = EM(Subbase, subps);		ebase[yyval] = b1;		shval = -(Supshift * (h1-b1)) - b2;		if (Supshift*(h1-b1) + h2 < h1-b1)	/* raise little super */			shval = -(h1-b1) + h2-b2 - d1;		eht[yyval] = h1 + max(0, h2 - (1-Supshift)*(h1-b1));		if (rclass[p1] == ILETF)			n = 4;		else if (rfont[p1] == ITAL)			n = 2;		/* Sup1space */		else			n = max(1, class[rclass[p1]][lclass[p2]]);		sh1 = pad(n);		rclass[p1] = rclass[p2];	/* OTHER leaves too much after sup */	}	dprintf(".\tS%d <- %d shift %g %d; b=%g, h=%g, ps=%d, subps=%d\n", 		yyval, p1, shval, p2, ebase[yyval], eht[yyval], ps, subps);	sh2 = Sub2space;	/* was Sub2space; */	printf(".as %d \\v'%gm'%s%s\\*(%d%s%s\\v'%gm'\n", 		yyval, REL(shval,ps), DPS(ps,subps), sh1, p2,		DPS(subps,ps), sh2, REL(-shval,ps));	rfont[p1] = 0;	sfree(p2);} void shift2(int p1, int p2, int p3){	int subps;	double h1, h2, h3, b1, b2, b3, subsh, d2, supsh;	int treg;	char *sh2; 	treg = salloc();	yyval = p1;	subps = ps;	/* sub and sup at this size */	ps += deltaps;	/* outer size */	h1 = eht[p1]; b1 = ebase[p1];	h2 = eht[p2]; b2 = ebase[p2];	h3 = eht[p3]; b3 = ebase[p3];	subsh = EM(Subbase, ps);	if (b1 > b2 + subsh) /* move little sub down */		subsh += b1;	eht[yyval] = max(subsh+b2-b1+h1, h2);	supsh = -Supshift*(h1-b1) - b3;	d2 = EM(Subbase, subps);	if (h3 < (1-Supshift)*(h1-b1))		supsh = -(h1-b1) + (h3-b3) - d2;	ebase[yyval] = subsh + b2 - b1;	eht[yyval] = h1 + subsh+b2-b1 + max(0, h3-(1-Supshift)*(h1-b1));	dprintf(".\tS%d <- %d sub %d sup %d, ps=%d, subps=%d, h=%g, b=%g\n",		yyval, p1, p2, p3, ps, subps, eht[yyval], ebase[yyval]);	if (rclass[p1] == ILETF)		sh2 = "\\|\\|";	else		sh2 = SS2space;	/*n = max(class[rclass[p1]][lclass[p2]], class[rclass[p1]][lclass[p3]]);	/*sh2 = pad(max(2, n));	*/	printf(".ds %d %s\\*(%d\n", p2, SS1space, p2);	nrwid(p2, subps, p2);	printf(".ds %d %s\\*(%d\n", p3, sh2, p3);	nrwid(p3, subps, p3);	printf(".nr %d \\n(%d\n", treg, p3);	printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, treg, treg, p2);	printf(".as %d %s\\v'%gm'\\*(%d\\v'%gm'\\h'-\\n(%du'\\\n", 		p1, DPS(ps,subps), REL(subsh,subps), p2, REL(-subsh,subps), p2);	printf("\\v'%gm'\\*(%d\\v'%gm'\\h'-\\n(%du+\\n(%du'%s%s\n", 		REL(supsh,subps), p3, REL(-supsh,subps), p3, treg, DPS(subps,ps), Sub2space);	if (rfont[p2] == ITAL)		rfont[yyval] = 0;	/* lie */	rclass[yyval] = rclass[p3];	/* was OTHER */	sfree(p2); sfree(p3); sfree(treg);}