tparen.c - plan9port - [fork] Plan 9 from user space
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tparen.c (2922B)
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1 #include "e.h"
2
3 #define abs(x) ((x) > 0 ? (x) : (-(x)))
4
5 extern void brack(int, char *, char *, char *);
6
7 void paren(int leftc, int p1, int rightc)
8 {
9 int n, m, j;
10 double h1, b1;
11 double v, bv; /* v = shift of inside, bv = shift of brackets */
12 extern double Parenbase, Parenshift, Parenheight;
13
14 bv = ttype == DEVPOST ? Parenshift : 0; /* move brackets down this much */
15 h1 = eht[p1];
16 b1 = ebase[p1];
17 yyval = p1;
18 lfont[yyval] = rfont[yyval] = 0;
19 n = REL(h1,ps) + 0.99; /* ceiling */
20 if (n < 2)
21 n = 1;
22 m = n - 2;
23 if (leftc == '{' || rightc == '}') {
24 n = n%2 ? n : n+1;
25 if (n < 3)
26 n = 3;
27 m = n-3;
28 }
29 eht[yyval] = EM((double) n + Parenheight, ps);
30 ebase[yyval] = eht[yyval]/2 - EM(Parenbase, ps);
31
32 /* try to cope with things that are badly centered */
33 /* (top heavy or bottom heavy) */
34 if (abs(h1/2 - b1) >= EM(0.5, ps))
35 v = REL(-ebase[yyval] + (eht[yyval]-h1)/2 + b1, ps);
36 else
37 v = 0; /* don't shift it at all */
38
39 printf(".ds %d \\^", (int)yyval); /* was \| */
40 if (bv)
41 printf("\\v'%gm'", bv);
42 switch (leftc) {
43 case 'n': /* nothing */
44 case '\0':
45 break;
46 case 'f': /* floor */
47 if (n <= 1)
48 printf("\\(lf");
49 else
50 brack(m, "\\(bv", "\\(bv", "\\(lf");
51 break;
52 case 'c': /* ceiling */
53 if (n <= 1)
54 printf("\\(lc");
55 else
56 brack(m, "\\(lc", "\\(bv", "\\(bv");
57 break;
58 case '{':
59 printf("\\b'\\(lt");
60 for(j = 0; j < m; j += 2) printf("\\(bv");
61 printf("\\(lk");
62 for(j = 0; j < m; j += 2) printf("\\(bv");
63 printf("\\(lb'");
64 break;
65 case '(':
66 brack(m, "\\(lt", "\\(bv", "\\(lb");
67 break;
68 case '[':
69 brack(m, "\\(lc", "\\(bv", "\\(lf");
70 break;
71 case '|':
72 brack(m, "|", "|", "|");
73 break;
74 default:
75 brack(m, (char *) &leftc, (char *) &leftc, (char *) &leftc);
76 break;
77 }
78 if (bv)
79 printf("\\v'%gm'", -bv);
80 if (v)
81 printf("\\v'%gm'\\*(%d\\v'%gm'", -v, p1, v);
82 else
83 printf("\\*(%d", p1);
84 if (rightc) {
85 if (bv)
86 printf("\\v'%gm'", bv);
87 switch (rightc) {
88 case 'f': /* floor */
89 if (n <= 1)
90 printf("\\(rf");
91 else
92 brack(m, "\\(bv", "\\(bv", "\\(rf");
93 break;
94 case 'c': /* ceiling */
95 if (n <= 1)
96 printf("\\(rc");
97 else
98 brack(m, "\\(rc", "\\(bv", "\\(bv");
99 break;
100 case '}':
101 printf("\\b'\\(rt");
102 for(j = 0; j < m; j += 2) printf("\\(bv");
103 printf("\\(rk");
104 for(j = 0; j < m; j += 2) printf("\\(bv");
105 printf("\\(rb'");
106 break;
107 case ']':
108 brack(m, "\\(rc", "\\(bv", "\\(rf");
109 break;
110 case ')':
111 brack(m, "\\(rt", "\\(bv", "\\(rb");
112 break;
113 case '|':
114 brack(m, "|", "|", "|");
115 break;
116 default:
117 brack(m, (char *) &rightc, (char *) &rightc, (char *) &rightc);
118 break;
119 }
120 if (bv)
121 printf("\\v'%gm'", -bv);
122 }
123 printf("\n");
124 dprintf(".\tcurly: h=%g b=%g n=%d v=%g l=%c, r=%c\n",
125 eht[yyval], ebase[yyval], n, v, leftc, rightc);
126 }
127
128 void brack(int m, char *t, char *c, char *b)
129 {
130 int j;
131 printf("\\b'%s", t);
132 for( j=0; j < m; j++)
133 printf("%s", c);
134 printf("%s'", b);
135 }