tshift.c - plan9port - [fork] Plan 9 from user space
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tshift.c (3402B)
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1 #include "e.h"
2 #include "y.tab.h"
3
4 void subsup(int p1, int p2, int p3)
5 {
6 if (p2 != 0 && p3 != 0)
7 shift2(p1, p2, p3);
8 else if (p2 != 0)
9 bshiftb(p1, SUB, p2);
10 else if (p3 != 0)
11 bshiftb(p1, SUP, p3);
12 }
13
14 extern double Subbase, Supshift;
15 extern char *Sub1space, *Sup1space, *Sub2space;
16 extern char *SS1space, *SS2space;
17
18 void bshiftb(int p1, int dir, int p2)
19 {
20 int subps, n;
21 double shval, d1, h1, b1, h2, b2;
22 char *sh1, *sh2;
23
24 yyval = p1;
25 h1 = eht[p1];
26 b1 = ebase[p1];
27 h2 = eht[p2];
28 b2 = ebase[p2];
29 subps = ps;
30 ps += deltaps;
31 if (dir == SUB) {
32 /* base .2m below bottom of main box */
33 shval = b1 + EM(Subbase, ps);
34 ebase[yyval] = shval + b2;
35 eht[yyval] = max(h1-b1+shval+b2, h2);
36 if (rfont[p1] == ITAL && lfont[p2] == ROM)
37 n = 2; /* Sub1space */
38 else
39 n = max(2, class[rclass[p1]][lclass[p2]]);
40 sh1 = pad(n);
41 rclass[p1] = OTHER; /* OTHER leaves too much after sup */
42 } else { /* superscript */
43 /* 4/10 up main box */
44 d1 = EM(Subbase, subps);
45 ebase[yyval] = b1;
46 shval = -(Supshift * (h1-b1)) - b2;
47 if (Supshift*(h1-b1) + h2 < h1-b1) /* raise little super */
48 shval = -(h1-b1) + h2-b2 - d1;
49 eht[yyval] = h1 + max(0, h2 - (1-Supshift)*(h1-b1));
50 if (rclass[p1] == ILETF)
51 n = 4;
52 else if (rfont[p1] == ITAL)
53 n = 2; /* Sup1space */
54 else
55 n = max(1, class[rclass[p1]][lclass[p2]]);
56 sh1 = pad(n);
57 rclass[p1] = rclass[p2]; /* OTHER leaves too much after sup */
58 }
59 dprintf(".\tS%d <- %d shift %g %d; b=%g, h=%g, ps=%d, subps=%d\n",
60 (int)yyval, p1, shval, p2, ebase[yyval], eht[yyval], ps, subps);
61 sh2 = Sub2space; /* was Sub2space; */
62 printf(".as %d \\v'%gm'%s%s\\*(%d%s%s\\v'%gm'\n",
63 (int)yyval, REL(shval,ps), DPS(ps,subps), sh1, p2,
64 DPS(subps,ps), sh2, REL(-shval,ps));
65 rfont[p1] = 0;
66 sfree(p2);
67 }
68
69 void shift2(int p1, int p2, int p3)
70 {
71 int subps;
72 double h1, h2, h3, b1, b2, b3, subsh, d2, supsh;
73 int treg;
74 char *sh2;
75
76 treg = salloc();
77 yyval = p1;
78 subps = ps; /* sub and sup at this size */
79 ps += deltaps; /* outer size */
80 h1 = eht[p1]; b1 = ebase[p1];
81 h2 = eht[p2]; b2 = ebase[p2];
82 h3 = eht[p3]; b3 = ebase[p3];
83 subsh = EM(Subbase, ps);
84 if (b1 > b2 + subsh) /* move little sub down */
85 subsh += b1;
86 eht[yyval] = max(subsh+b2-b1+h1, h2);
87 supsh = -Supshift*(h1-b1) - b3;
88 d2 = EM(Subbase, subps);
89 if (h3 < (1-Supshift)*(h1-b1))
90 supsh = -(h1-b1) + (h3-b3) - d2;
91 ebase[yyval] = subsh + b2 - b1;
92 eht[yyval] = h1 + subsh+b2-b1 + max(0, h3-(1-Supshift)*(h1-b1));
93 dprintf(".\tS%d <- %d sub %d sup %d, ps=%d, subps=%d, h=%g, b=%g\n",
94 (int)yyval, p1, p2, p3, ps, subps, eht[yyval], ebase[yyval]);
95 if (rclass[p1] == ILETF)
96 sh2 = "\\|\\|";
97 else
98 sh2 = SS2space;
99 /*n = max(class[rclass[p1]][lclass[p2]], class[rclass[p1]][lclass[p3]]);
100 /*sh2 = pad(max(2, n));
101 */
102 printf(".ds %d %s\\*(%d\n", p2, SS1space, p2);
103 nrwid(p2, subps, p2);
104 printf(".ds %d %s\\*(%d\n", p3, sh2, p3);
105 nrwid(p3, subps, p3);
106 printf(".nr %d \\n(%d\n", treg, p3);
107 printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, treg, treg, p2);
108 printf(".as %d %s\\v'%gm'\\*(%d\\v'%gm'\\h'-\\n(%du'\\\n",
109 p1, DPS(ps,subps), REL(subsh,subps), p2, REL(-subsh,subps), p2);
110 printf("\\v'%gm'\\*(%d\\v'%gm'\\h'-\\n(%du+\\n(%du'%s%s\n",
111 REL(supsh,subps), p3, REL(-supsh,subps), p3, treg, DPS(subps,ps), Sub2space);
112 if (rfont[p2] == ITAL)
113 rfont[yyval] = 0; /* lie */
114 rclass[yyval] = rclass[p3]; /* was OTHER */
115 sfree(p2); sfree(p3); sfree(treg);
116 }