ref: c12e49ecbf4ae7933b13d592543c9f7c7dc03581
dir: /sys/src/cmd/htmlroff/t8.c/
#include "a.h"
/*
* 8. Number Registers
* (Reg register implementation is also here.)
*/
/*
* \nx N
* \n(xx N
* \n+x N+=M
* \n-x N-=M
*
* .nr R ±N M
* .af R c
*
* formats
* 1 0, 1, 2, 3, ...
* 001 001, 002, 003, ...
* i 0, i, ii, iii, iv, v, ...
* I 0, I, II, III, IV, V, ...
* a 0, a, b, ..., aa, ab, ..., zz, aaa, ...
* A 0, A, B, ..., AA, AB, ..., ZZ, AAA, ...
*
* \gx \g(xx return format of number register
*
* .rr R
*/
typedef struct Reg Reg;
struct Reg
{
Reg *next;
Rune *name;
Rune *val;
Rune *fmt;
int inc;
};
Reg *dslist;
Reg *nrlist;
/*
* Define strings and numbers.
*/
void
dsnr(Rune *name, Rune *val, Reg **l)
{
Reg *s;
for(s = *l; s != nil; s = *l){
if(runestrcmp(s->name, name) == 0)
break;
l = &s->next;
}
if(val == nil){
if(s){
*l = s->next;
free(s->val);
free(s->fmt);
free(s);
}
return;
}
if(s == nil){
s = emalloc(sizeof(Reg));
*l = s;
s->name = erunestrdup(name);
}else
free(s->val);
s->val = erunestrdup(val);
}
Rune*
getdsnr(Rune *name, Reg *list)
{
Reg *s;
for(s=list; s; s=s->next)
if(runestrcmp(name, s->name) == 0)
return s->val;
return nil;
}
void
ds(Rune *name, Rune *val)
{
dsnr(name, val, &dslist);
}
void
as(Rune *name, Rune *val)
{
Rune *p, *q;
p = getds(name);
if(p == nil)
p = L("");
q = runemalloc(runestrlen(p)+runestrlen(val)+1);
runestrcpy(q, p);
runestrcat(q, val);
ds(name, q);
free(q);
}
Rune*
getds(Rune *name)
{
return getdsnr(name, dslist);
}
void
printds(int t)
{
int n, total;
Reg *s;
total = 0;
for(s=dslist; s; s=s->next){
if(s->val)
n = runestrlen(s->val);
else
n = 0;
total += n;
if(!t)
fprint(2, "%S\t%d\n", s->name, n);
}
fprint(2, "total\t%d\n", total);
}
void
nr(Rune *name, int val)
{
Rune buf[20];
runesnprint(buf, nelem(buf), "%d", val);
_nr(name, buf);
}
void
af(Rune *name, Rune *fmt)
{
Reg *s;
if(_getnr(name) == nil)
_nr(name, L("0"));
for(s=nrlist; s; s=s->next)
if(runestrcmp(s->name, name) == 0)
s->fmt = erunestrdup(fmt);
}
Rune*
getaf(Rune *name)
{
Reg *s;
for(s=nrlist; s; s=s->next)
if(runestrcmp(s->name, name) == 0)
return s->fmt;
return nil;
}
void
printnr(void)
{
Reg *r;
for(r=nrlist; r; r=r->next)
fprint(2, "%S %S %d\n", r->name, r->val, r->inc);
}
/*
* Some internal number registers are actually strings,
* so provide _ versions to get at them.
*/
void
_nr(Rune *name, Rune *val)
{
dsnr(name, val, &nrlist);
}
Rune*
_getnr(Rune *name)
{
return getdsnr(name, nrlist);
}
int
getnr(Rune *name)
{
Rune *p;
p = _getnr(name);
if(p == nil)
return 0;
return eval(p);
}
/* new register */
void
r_nr(int argc, Rune **argv)
{
Reg *s;
if(argc < 2)
return;
if(argc < 3)
nr(argv[1], 0);
else{
if(argv[2][0] == '+')
nr(argv[1], getnr(argv[1])+eval(argv[2]+1));
else if(argv[2][0] == '-')
nr(argv[1], getnr(argv[1])-eval(argv[2]+1));
else
nr(argv[1], eval(argv[2]));
}
if(argc > 3){
for(s=nrlist; s; s=s->next)
if(runestrcmp(s->name, argv[1]) == 0)
s->inc = eval(argv[3]);
}
}
/* assign format */
void
r_af(int argc, Rune **argv)
{
USED(argc);
af(argv[1], argv[2]);
}
/* remove register */
void
r_rr(int argc, Rune **argv)
{
int i;
for(i=1; i<argc; i++)
_nr(argv[i], nil);
}
/* fmt integer in base 26 */
void
alpha(Rune *buf, int n, int a)
{
int i, v;
i = 1;
for(v=n; v>0; v/=26)
i++;
if(i == 0)
i = 1;
buf[i] = 0;
while(i > 0){
buf[--i] = a+n%26;
n /= 26;
}
}
struct romanv {
char *s;
int v;
} romanv[] =
{
"m", 1000,
"cm", 900,
"d", 500,
"cd", 400,
"c", 100,
"xc", 90,
"l", 50,
"xl", 40,
"x", 10,
"ix", 9,
"v", 5,
"iv", 4,
"i", 1
};
/* fmt integer in roman numerals! */
void
roman(Rune *buf, int n, int upper)
{
Rune *p;
char *q;
struct romanv *r;
if(upper)
upper = 'A' - 'a';
if(n >= 5000 || n <= 0){
runestrcpy(buf, L("-"));
return;
}
p = buf;
r = romanv;
while(n > 0){
while(n >= r->v){
for(q=r->s; *q; q++)
*p++ = *q + upper;
n -= r->v;
}
r++;
}
*p = 0;
}
Rune*
getname(void)
{
int i, c, cc;
static Rune buf[100];
/* XXX add [name] syntax as in groff */
c = getnext();
if(c < 0)
return L("");
if(c == '\n'){
warn("newline in name\n");
ungetnext(c);
return L("");
}
if(c == '['){
for(i=0; i<nelem(buf)-1; i++){
if((c = getrune()) < 0)
return L("");
if(c == ']'){
buf[i] = 0;
return buf;
}
buf[i] = c;
}
return L("");
}
if(c != '('){
buf[0] = c;
buf[1] = 0;
return buf;
}
c = getnext();
cc = getnext();
if(c < 0 || cc < 0)
return L("");
if(c == '\n' || cc == '\n'){
warn("newline in \\n");
ungetnext(cc);
if(c == '\n')
ungetnext(c);
}
buf[0] = c;
buf[1] = cc;
buf[2] = 0;
return buf;
}
/* \n - return number register */
int
e_n(void)
{
int inc, v, l;
Rune *name, *fmt, buf[100];
Reg *s;
inc = getnext();
if(inc < 0)
return -1;
if(inc != '+' && inc != '-'){
ungetnext(inc);
inc = 0;
}
name = getname();
if(_getnr(name) == nil)
_nr(name, L("0"));
for(s=nrlist; s; s=s->next){
if(runestrcmp(s->name, name) == 0){
if(s->fmt == nil && !inc && s->val[0]){
/* might be a string! */
pushinputstring(s->val);
return 0;
}
v = eval(s->val);
if(inc){
if(inc == '+')
v += s->inc;
else
v -= s->inc;
runesnprint(buf, nelem(buf), "%d", v);
free(s->val);
s->val = erunestrdup(buf);
}
fmt = s->fmt;
if(fmt == nil)
fmt = L("1");
switch(fmt[0]){
case 'i':
case 'I':
roman(buf, v, fmt[0]=='I');
break;
case 'a':
case 'A':
alpha(buf, v, fmt[0]);
break;
default:
l = runestrlen(fmt);
if(l == 0)
l = 1;
runesnprint(buf, sizeof buf, "%0*d", l, v);
break;
}
pushinputstring(buf);
return 0;
}
}
pushinputstring(L(""));
return 0;
}
/* \g - number register format */
int
e_g(void)
{
Rune *p;
p = getaf(getname());
if(p == nil)
p = L("1");
pushinputstring(p);
return 0;
}
void
r_pnr(int argc, Rune **argv)
{
USED(argc);
USED(argv);
printnr();
}
void
t8init(void)
{
addreq(L("nr"), r_nr, -1);
addreq(L("af"), r_af, 2);
addreq(L("rr"), r_rr, -1);
addreq(L("pnr"), r_pnr, 0);
addesc('n', e_n, CopyMode|ArgMode|HtmlMode);
addesc('g', e_g, 0);
}