Subversion Repositories planix.SVN

#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);
}