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/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "e.h"
#include "e.def"
void
bshiftb(int p1, int dir, int p2)
{
int shval, d1, h1, b1, h2, b2;
#ifndef NEQN
int diffps, effps, effps2;
char *sh1, *sh2;
#endif /* NEQN */
yyval = p1;
h1 = eht[p1];
b1 = ebase[p1];
h2 = eht[p2];
b2 = ebase[p2];
#ifndef NEQN
effps = EFFPS(ps);
effps2 = EFFPS(ps+deltaps);
diffps = deltaps;
sh1 = sh2 = "";
#endif /* NEQN */
if (dir == SUB) { /* subscript */
#ifndef NEQN
/* top 1/2m above bottom of main box */
d1 = VERT(EM(0.5, effps2));
#else /* NEQN */
d1 = VERT(1);
#endif /* NEQN */
shval = - d1 + h2 - b2;
if (d1+b1 > h2) /* move little sub down */
shval = b1-b2;
ebase[yyval] = b1 + max(0, h2-b1-d1);
eht[yyval] = h1 + max(0, h2-b1-d1);
#ifndef NEQN
if (rfont[p1] == ITAL && lfont[p2] == ROM)
sh1 = "\\|";
if (rfont[p2] == ITAL)
sh2 = "\\|";
#endif /* NEQN */
} else { /* superscript */
#ifndef NEQN
/* 4/10 up main box */
d1 = VERT(EM(0.2, effps));
#else /* NEQN */
d1 = VERT(1);
#endif /* NEQN */
ebase[yyval] = b1;
#ifndef NEQN
shval = -VERT((4 * (h1-b1)) / 10) - b2;
if (VERT(4*(h1-b1)/10) + h2 < h1-b1) /* raise little super */
#else /* NEQN */
shval = -VERT(1) - b2;
if (VERT(1) + h2 < h1-b1) /* raise little super */
#endif /* NEQN */
shval = -(h1-b1) + h2-b2 - d1;
#ifndef NEQN
eht[yyval] = h1 + max(0, h2-VERT((6*(h1-b1))/10));
if (rfont[p1] == ITAL)
sh1 = "\\|";
if (rfont[p2] == ITAL)
sh2 = "\\|";
#else /* NEQN */
eht[yyval] = h1 + max(0, h2 - VERT(1));
#endif /* NEQN */
}
if (dbg)
printf(".\tb:b shift b: S%d <- S%d vert %d S%d vert %d; "
"b=%d, h=%d\n", yyval, p1, shval, p2, -shval,
ebase[yyval], eht[yyval]);
#ifndef NEQN
printf(".as %d \\v'%du'\\s-%d%s\\*(%d\\s+%d%s\\v'%du'\n",
yyval, shval, diffps, sh1, p2, diffps, sh2, -shval);
ps += deltaps;
if (rfont[p2] == ITAL)
rfont[p1] = 0;
else
rfont[p1] = rfont[p2];
#else /* NEQN */
printf(".as %d \\v'%du'\\*(%d\\v'%du'\n",
yyval, shval, p2, -shval);
#endif /* NEQN */
ofree(p2);
}
void
shift(int p1)
{
ps -= deltaps;
yyval = p1;
if (dbg) printf(".\tshift: %d;ps=%d\n", yyval, ps);
}
void
shift2(int p1, int p2, int p3)
{
int effps, h1, h2, h3, b1, b2, b3, subsh, d1, d2, supsh, treg;
#ifndef NEQN
int effps2;
#endif /* NEQN */
treg = oalloc();
yyval = p1;
if (dbg) printf(".\tshift2 s%d <- %d %d %d\n", yyval, p1, p2, p3);
effps = EFFPS(ps+deltaps);
#ifndef NEQN
eht[p3] = h3 = VERT((eht[p3] * effps) / EFFPS(ps));
ps += deltaps;
effps2 = EFFPS(ps+deltaps);
#endif /* NEQN */
h1 = eht[p1]; b1 = ebase[p1];
h2 = eht[p2]; b2 = ebase[p2];
#ifndef NEQN
b3 = ebase[p3];
d1 = VERT(EM(0.5, effps2));
#else /* NEQN */
h3 = eht[p3]; b3 = ebase[p3];
d1 = VERT(1);
#endif /* NEQN */
subsh = -d1+h2-b2;
if (d1+b1 > h2) /* move little sub down */
subsh = b1-b2;
#ifndef NEQN
supsh = -VERT((4*(h1-b1))/10) - b3;
d2 = VERT(EM(0.2, effps));
if (VERT(4*(h1-b1)/10)+h3 < h1-b1)
#else /* NEQN */
supsh = - VERT(1) - b3;
d2 = VERT(1);
if (VERT(1)+h3 < h1-b1)
#endif /* NEQN */
supsh = -(h1-b1) + (h3-b3) - d2;
#ifndef NEQN
eht[yyval] = h1 + max(0, h3-VERT((6*(h1-b1))/10)) + max(0, h2-b1-d1);
#else /* NEQN */
eht[yyval] = h1 + max(0, h3-VERT(1)) + max(0, h2-b1-d1);
#endif /* NEQN */
ebase[yyval] = b1+max(0, h2-b1-d1);
#ifndef NEQN
if (rfont[p1] == ITAL && lfont[p2] == ROM)
printf(".ds %d \\|\\*(%d\n", p2, p2);
if (rfont[p2] == ITAL)
printf(".as %d \\|\n", p2);
#endif /* NEQN */
nrwid(p2, effps, p2);
#ifndef NEQN
if (rfont[p1] == ITAL && lfont[p3] == ROM)
printf(".ds %d \\|\\|\\*(%d\n", p3, p3);
else
printf(".ds %d \\|\\*(%d\n", p3, p3);
#endif /* NEQN */
nrwid(p3, effps, p3);
printf(".nr %d \\n(%d\n", treg, p3);
printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, treg, treg, p2);
#ifndef NEQN
printf(".as %d \\v'%du'\\s%d\\*(%d\\h'-\\n(%du'\\v'%du'\\\n",
p1, subsh, effps, p2, p2, -subsh+supsh);
printf("\\s%d\\*(%d\\h'-\\n(%du+\\n(%du'\\s%d\\v'%du'\n",
effps, p3, p3, treg, effps2, -supsh);
#else /* NEQN */
printf(".as %d \\v'%du'\\*(%d\\h'-\\n(%du'\\v'%du'\\\n",
p1, subsh, p2, p2, -subsh+supsh);
printf("\\*(%d\\h'-\\n(%du+\\n(%du'\\v'%du'\n",
p3, p3, treg, -supsh);
#endif /* NEQN */
ps += deltaps;
#ifndef NEQN
if (rfont[p2] == ITAL)
rfont[yyval] = 0; /* lie */
#endif /* NEQN */
ofree(p2); ofree(p3); ofree(treg);
}
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