ref: a3f2d6d23ed1be69fee607bdedadc0438fd01305
dir: /sys/src/cmd/htmlroff/t7.c/
/*
* 7. Macros, strings, diversion, and position traps.
*
* macros can override builtins
* builtins can be renamed or removed!
*/
#include "a.h"
enum
{
MAXARG = 10,
MAXMSTACK = 40
};
/* macro invocation frame */
typedef struct Mac Mac;
struct Mac
{
int argc;
Rune *argv[MAXARG];
};
Mac mstack[MAXMSTACK];
int nmstack;
void emitdi(void);
void flushdi(void);
/*
* Run a user-defined macro.
*/
void popmacro(void);
int
runmacro(int dot, int argc, Rune **argv)
{
Rune *p;
int i;
Mac *m;
if(verbose && isupperrune(argv[0][0])) fprint(2, "run: %S\n", argv[0]);
p = getds(argv[0]);
if(p == nil){
if(verbose)
warn("ignoring unknown request %C%S", dot, argv[0]);
if(verbose > 1){
for(i=0; i<argc; i++)
fprint(2, " %S", argv[i]);
fprint(2, "\n");
}
return -1;
}
if(nmstack >= nelem(mstack)){
fprint(2, "%L: macro stack overflow:");
for(i=0; i<nmstack; i++)
fprint(2, " %S", mstack[i].argv[0]);
fprint(2, "\n");
return -1;
}
m = &mstack[nmstack++];
m->argc = argc;
for(i=0; i<argc; i++)
m->argv[i] = erunestrdup(argv[i]);
pushinputstring(p);
nr(L(".$"), argc-1);
inputnotify(popmacro);
return 0;
}
void
popmacro(void)
{
int i;
Mac *m;
if(--nmstack < 0){
fprint(2, "%L: macro stack underflow\n");
return;
}
m = &mstack[nmstack];
for(i=0; i<m->argc; i++)
free(m->argv[i]);
if(nmstack > 0)
nr(L(".$"), mstack[nmstack-1].argc-1);
else
nr(L(".$"), 0);
}
void popmacro1(void);
jmp_buf runjb[10];
int nrunjb;
void
runmacro1(Rune *name)
{
Rune *argv[2];
int obol;
if(verbose) fprint(2, "outcb %p\n", outcb);
obol = bol;
argv[0] = name;
argv[1] = nil;
bol = 1;
if(runmacro('.', 1, argv) >= 0){
inputnotify(popmacro1);
if(!setjmp(runjb[nrunjb++]))
runinput();
else
if(verbose) fprint(2, "finished %S\n", name);
}
bol = obol;
}
void
popmacro1(void)
{
popmacro();
if(nrunjb >= 0)
longjmp(runjb[--nrunjb], 1);
}
/*
* macro arguments
*
* "" means " inside " "
* "" empty string
* \newline can be done
* argument separator is space (not tab)
* number register .$ = number of arguments
* no arguments outside macros or in strings
*
* arguments copied in copy mode
*/
/*
* diversions
*
* processed output diverted
* dn dl registers vertical and horizontal size of last diversion
* .z - current diversion name
*/
/*
* traps
*
* skip most
* .t register - distance to next trap
*/
static Rune *trap0;
void
outtrap(void)
{
Rune *t;
if(outcb)
return;
if(trap0){
if(verbose) fprint(2, "trap: %S\n", trap0);
t = trap0;
trap0 = nil;
runmacro1(t);
free(t);
}
}
/* .wh - install trap */
void
r_wh(int argc, Rune **argv)
{
int i;
if(argc < 2)
return;
i = eval(argv[1]);
if(argc == 2){
if(i == 0){
free(trap0);
trap0 = nil;
}else
if(verbose)
warn("not removing trap at %d", i);
}
if(argc > 2){
if(i == 0){
free(trap0);
trap0 = erunestrdup(argv[2]);
}else
if(verbose)
warn("not installing %S trap at %d", argv[2], i);
}
}
void
r_ch(int argc, Rune **argv)
{
int i;
if(argc == 2){
if(trap0 && runestrcmp(argv[1], trap0) == 0){
free(trap0);
trap0 = nil;
}else
if(verbose)
warn("not removing %S trap", argv[1]);
return;
}
if(argc >= 3){
i = eval(argv[2]);
if(i == 0){
free(trap0);
trap0 = erunestrdup(argv[1]);
}else
if(verbose)
warn("not moving %S trap to %d", argv[1], i);
}
}
void
r_dt(int argc, Rune **argv)
{
USED(argc);
USED(argv);
warn("ignoring diversion trap");
}
/* define macro - .de, .am, .ig */
void
r_de(int argc, Rune **argv)
{
Rune *end, *p;
Fmt fmt;
int ignore, len;
delreq(argv[1]);
delraw(argv[1]);
ignore = runestrcmp(argv[0], L("ig")) == 0;
if(!ignore)
runefmtstrinit(&fmt);
end = L("..");
if(argc >= 3)
end = argv[2];
if(runestrcmp(argv[0], L("am")) == 0 && (p=getds(argv[1])) != nil)
fmtrunestrcpy(&fmt, p);
len = runestrlen(end);
while((p = readline(CopyMode)) != nil){
if(runestrncmp(p, end, len) == 0
&& (p[len]==' ' || p[len]==0 || p[len]=='\t'
|| (p[len]=='\\' && p[len+1]=='}'))){
free(p);
goto done;
}
if(!ignore)
fmtprint(&fmt, "%S\n", p);
free(p);
}
warn("eof in %C%S %S - looking for %#Q", dot, argv[0], argv[1], end);
done:
if(ignore)
return;
p = runefmtstrflush(&fmt);
if(p == nil)
sysfatal("out of memory");
ds(argv[1], p);
free(p);
}
/* define string .ds .as */
void
r_ds(Rune *cmd)
{
Rune *name, *line, *p;
name = copyarg();
line = readline(CopyMode);
if(name == nil || line == nil){
free(name);
return;
}
p = line;
if(*p == '"')
p++;
if(cmd[0] == 'd')
ds(name, p);
else
as(name, p);
free(name);
free(line);
}
/* remove request, macro, or string */
void
r_rm(int argc, Rune **argv)
{
int i;
emitdi();
for(i=1; i<argc; i++){
delreq(argv[i]);
delraw(argv[i]);
ds(argv[i], nil);
}
}
/* .rn - rename request, macro, or string */
void
r_rn(int argc, Rune **argv)
{
USED(argc);
renreq(argv[1], argv[2]);
renraw(argv[1], argv[2]);
ds(argv[2], getds(argv[1]));
ds(argv[1], nil);
}
/* .di - divert output to macro xx */
/* .da - divert, appending to macro */
/* page offsetting is not done! */
Fmt difmt;
int difmtinit;
Rune di[20][100];
int ndi;
void
emitdi(void)
{
flushdi();
runefmtstrinit(&difmt);
difmtinit = 1;
fmtrune(&difmt, Uformatted);
}
void
flushdi(void)
{
int n;
Rune *p;
if(ndi == 0 || difmtinit == 0)
return;
fmtrune(&difmt, Uunformatted);
p = runefmtstrflush(&difmt);
memset(&difmt, 0, sizeof difmt);
difmtinit = 0;
if(p == nil)
warn("out of memory in diversion %C%S", dot, di[ndi-1]);
else{
n = runestrlen(p);
if(n > 0 && p[n-1] != '\n'){
p = runerealloc(p, n+2);
p[n] = '\n';
p[n+1] = 0;
}
}
as(di[ndi-1], p);
free(p);
}
void
outdi(Rune r)
{
if(!difmtinit) abort();
if(r == Uempty)
return;
fmtrune(&difmt, r);
}
/* .di, .da */
void
r_di(int argc, Rune **argv)
{
br();
if(argc > 2)
warn("extra arguments to %C%S", dot, argv[0]);
if(argc == 1){
/* end diversion */
if(ndi <= 0){
// warn("unmatched %C%S", dot, argv[0]);
return;
}
flushdi();
if(--ndi == 0){
_nr(L(".z"), nil);
outcb = nil;
}else{
_nr(L(".z"), di[ndi-1]);
runefmtstrinit(&difmt);
fmtrune(&difmt, Uformatted);
difmtinit = 1;
}
return;
}
/* start diversion */
/* various register state should be saved, but it's all useless to us */
flushdi();
if(ndi >= nelem(di))
sysfatal("%Cdi overflow", dot);
if(argv[0][1] == 'i')
ds(argv[1], nil);
_nr(L(".z"), argv[1]);
runestrcpy(di[ndi++], argv[1]);
runefmtstrinit(&difmt);
fmtrune(&difmt, Uformatted);
difmtinit = 1;
outcb = outdi;
}
/* .wh - install trap */
/* .ch - change trap */
/* .dt - install diversion trap */
/* set input-line count trap */
int itrapcount;
int itrapwaiting;
Rune *itrapname;
void
r_it(int argc, Rune **argv)
{
if(argc < 3){
itrapcount = 0;
return;
}
itrapcount = eval(argv[1]);
free(itrapname);
itrapname = erunestrdup(argv[2]);
}
void
itrap(void)
{
itrapset();
if(itrapwaiting){
itrapwaiting = 0;
runmacro1(itrapname);
}
}
void
itrapset(void)
{
if(itrapcount > 0 && --itrapcount == 0)
itrapwaiting = 1;
}
/* .em - invoke macro when all input is over */
void
r_em(int argc, Rune **argv)
{
Rune buf[20];
USED(argc);
runesnprint(buf, nelem(buf), ".%S\n", argv[1]);
as(L("eof"), buf);
}
int
e_star(void)
{
Rune *p;
p = getds(getname());
if(p)
pushinputstring(p);
return 0;
}
int
e_t(void)
{
if(inputmode&CopyMode)
return '\t';
return 0;
}
int
e_a(void)
{
if(inputmode&CopyMode)
return '\a';
return 0;
}
int
e_backslash(void)
{
if(inputmode&ArgMode)
ungetrune('\\');
return backslash;
}
int
e_dot(void)
{
return '.';
}
int
e_dollar(void)
{
int c;
c = getnext();
if(c < '1' || c > '9'){
ungetnext(c);
return 0;
}
c -= '0';
if(nmstack <= 0 || mstack[nmstack-1].argc <= c)
return 0;
pushinputstring(mstack[nmstack-1].argv[c]);
return 0;
}
void
t7init(void)
{
addreq(L("de"), r_de, -1);
addreq(L("am"), r_de, -1);
addreq(L("ig"), r_de, -1);
addraw(L("ds"), r_ds);
addraw(L("as"), r_ds);
addreq(L("rm"), r_rm, -1);
addreq(L("rn"), r_rn, -1);
addreq(L("di"), r_di, -1);
addreq(L("da"), r_di, -1);
addreq(L("it"), r_it, -1);
addreq(L("em"), r_em, 1);
addreq(L("wh"), r_wh, -1);
addreq(L("ch"), r_ch, -1);
addreq(L("dt"), r_dt, -1);
addesc('$', e_dollar, CopyMode|ArgMode|HtmlMode);
addesc('*', e_star, CopyMode|ArgMode|HtmlMode);
addesc('t', e_t, CopyMode|ArgMode);
addesc('a', e_a, CopyMode|ArgMode);
addesc('\\', e_backslash, ArgMode|CopyMode);
addesc('.', e_dot, CopyMode|ArgMode);
ds(L("eof"), L(".sp 0.5i\n"));
ds(L(".."), L(""));
}