ref: bf645afaac246967b9590ae7463f243c11d97480
dir: /sys/src/cmd/acme/edit.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <cursor.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include <fcall.h>
#include <plumb.h>
#include "dat.h"
#include "edit.h"
#include "fns.h"
static char linex[]="\n";
static char wordx[]=" \t\n";
struct cmdtab cmdtab[]={
/* cmdc text regexp addr defcmd defaddr count token fn */
'\n', 0, 0, 0, 0, aDot, 0, 0, nl_cmd,
'a', 1, 0, 0, 0, aDot, 0, 0, a_cmd,
'b', 0, 0, 0, 0, aNo, 0, linex, b_cmd,
'c', 1, 0, 0, 0, aDot, 0, 0, c_cmd,
'd', 0, 0, 0, 0, aDot, 0, 0, d_cmd,
'e', 0, 0, 0, 0, aNo, 0, wordx, e_cmd,
'f', 0, 0, 0, 0, aNo, 0, wordx, f_cmd,
'g', 0, 1, 0, 'p', aDot, 0, 0, g_cmd,
'i', 1, 0, 0, 0, aDot, 0, 0, i_cmd,
'm', 0, 0, 1, 0, aDot, 0, 0, m_cmd,
'p', 0, 0, 0, 0, aDot, 0, 0, p_cmd,
'r', 0, 0, 0, 0, aDot, 0, wordx, e_cmd,
's', 0, 1, 0, 0, aDot, 1, 0, s_cmd,
't', 0, 0, 1, 0, aDot, 0, 0, m_cmd,
'u', 0, 0, 0, 0, aNo, 2, 0, u_cmd,
'v', 0, 1, 0, 'p', aDot, 0, 0, g_cmd,
'w', 0, 0, 0, 0, aAll, 0, wordx, w_cmd,
'x', 0, 1, 0, 'p', aDot, 0, 0, x_cmd,
'y', 0, 1, 0, 'p', aDot, 0, 0, x_cmd,
'=', 0, 0, 0, 0, aDot, 0, linex, eq_cmd,
'B', 0, 0, 0, 0, aNo, 0, linex, B_cmd,
'D', 0, 0, 0, 0, aNo, 0, linex, D_cmd,
'X', 0, 1, 0, 'f', aNo, 0, 0, X_cmd,
'Y', 0, 1, 0, 'f', aNo, 0, 0, X_cmd,
'<', 0, 0, 0, 0, aDot, 0, linex, pipe_cmd,
'|', 0, 0, 0, 0, aDot, 0, linex, pipe_cmd,
'>', 0, 0, 0, 0, aDot, 0, linex, pipe_cmd,
/* deliberately unimplemented:
'k', 0, 0, 0, 0, aDot, 0, 0, k_cmd,
'n', 0, 0, 0, 0, aNo, 0, 0, n_cmd,
'q', 0, 0, 0, 0, aNo, 0, 0, q_cmd,
'!', 0, 0, 0, 0, aNo, 0, linex, plan9_cmd,
*/
0, 0, 0, 0, 0, 0, 0, 0,
};
Cmd *parsecmd(int);
Addr *compoundaddr(void);
Addr *simpleaddr(void);
void freecmd(void);
void okdelim(int);
Rune *cmdstartp;
Rune *cmdendp;
Rune *cmdp;
Channel *editerrc;
String *lastpat;
int patset;
List cmdlist;
List addrlist;
List stringlist;
Text *curtext;
int editing = Inactive;
String* newstring(int);
void
editthread(void*)
{
Cmd *cmdp;
threadsetname("editthread");
while((cmdp=parsecmd(0)) != 0){
// ocurfile = curfile;
// loaded = curfile && !curfile->unread;
if(cmdexec(curtext, cmdp) == 0)
break;
freecmd();
}
sendp(editerrc, nil);
}
void
allelogterm(Window *w, void*)
{
elogterm(w->body.file);
}
void
alleditinit(Window *w, void*)
{
textcommit(&w->tag, TRUE);
textcommit(&w->body, TRUE);
w->body.file->editclean = FALSE;
}
void
allupdate(Window *w, void*)
{
Text *t;
int i;
File *f;
t = &w->body;
f = t->file;
if(f->curtext != t) /* do curtext only */
return;
if(f->elog.type == Null)
elogterm(f);
else if(f->elog.type != Empty){
elogapply(f);
if(f->editclean){
f->mod = FALSE;
for(i=0; i<f->ntext; i++)
f->text[i]->w->dirty = FALSE;
}
}
textsetselect(t, t->q0, t->q1);
textscrdraw(t);
winsettag(w);
}
void
editerror(char *fmt, ...)
{
va_list arg;
char *s;
va_start(arg, fmt);
s = vsmprint(fmt, arg);
va_end(arg);
freecmd();
allwindows(allelogterm, nil); /* truncate the edit logs */
sendp(editerrc, s);
threadexits(nil);
}
void
editcmd(Text *ct, Rune *r, uint n)
{
char *err;
if(n == 0)
return;
if(2*n > RBUFSIZE){
warning(nil, "string too long\n");
return;
}
allwindows(alleditinit, nil);
if(cmdstartp)
free(cmdstartp);
cmdstartp = runemalloc(n+2);
runemove(cmdstartp, r, n);
if(r[n] != '\n')
cmdstartp[n++] = '\n';
cmdstartp[n] = '\0';
cmdendp = cmdstartp+n;
cmdp = cmdstartp;
if(ct->w == nil)
curtext = nil;
else
curtext = &ct->w->body;
resetxec();
if(editerrc == nil){
editerrc = chancreate(sizeof(char*), 0);
lastpat = allocstring(0);
}
threadcreate(editthread, nil, STACK);
err = recvp(editerrc);
editing = Inactive;
if(err != nil){
if(err[0] != '\0')
warning(nil, "Edit: %s\n", err);
free(err);
}
/* update everyone whose edit log has data */
allwindows(allupdate, nil);
}
int
getch(void)
{
if(*cmdp == *cmdendp)
return -1;
return *cmdp++;
}
int
nextc(void)
{
if(*cmdp == *cmdendp)
return -1;
return *cmdp;
}
void
ungetch(void)
{
if(--cmdp < cmdstartp)
error("ungetch");
}
long
getnum(int signok)
{
long n;
int c, sign;
n = 0;
sign = 1;
if(signok>1 && nextc()=='-'){
sign = -1;
getch();
}
if((c=nextc())<'0' || '9'<c) /* no number defaults to 1 */
return sign;
while('0'<=(c=getch()) && c<='9')
n = n*10 + (c-'0');
ungetch();
return sign*n;
}
int
cmdskipbl(void)
{
int c;
do
c = getch();
while(c==' ' || c=='\t');
if(c >= 0)
ungetch();
return c;
}
/*
* Check that list has room for one more element.
*/
void
growlist(List *l)
{
if(l->listptr==0 || l->nalloc==0){
l->nalloc = INCR;
l->listptr = emalloc(INCR*sizeof(void*));
l->nused = 0;
}else if(l->nused == l->nalloc){
l->listptr = erealloc(l->listptr, (l->nalloc+INCR)*sizeof(void*));
memset(l->ptr+l->nalloc, 0, INCR*sizeof(void*));
l->nalloc += INCR;
}
}
/*
* Remove the ith element from the list
*/
void
dellist(List *l, int i)
{
l->nused--;
memmove(&l->ptr[i], &l->ptr[i+1], (l->nused-i)*sizeof(void*));
}
/*
* Add a new element, whose position is i, to the list
*/
void
inslist(List *l, int i, void *v)
{
growlist(l);
memmove(&l->ptr[i+1], &l->ptr[i], (l->nused-i)*sizeof(void*));
l->ptr[i] = v;
l->nused++;
}
void
listfree(List *l)
{
free(l->listptr);
free(l);
}
String*
allocstring(int n)
{
String *s;
s = emalloc(sizeof(String));
s->n = n;
s->nalloc = n+10;
s->r = emalloc(s->nalloc*sizeof(Rune));
s->r[n] = '\0';
return s;
}
void
freestring(String *s)
{
free(s->r);
free(s);
}
Cmd*
newcmd(void){
Cmd *p;
p = emalloc(sizeof(Cmd));
inslist(&cmdlist, cmdlist.nused, p);
return p;
}
String*
newstring(int n)
{
String *p;
p = allocstring(n);
inslist(&stringlist, stringlist.nused, p);
return p;
}
Addr*
newaddr(void)
{
Addr *p;
p = emalloc(sizeof(Addr));
inslist(&addrlist, addrlist.nused, p);
return p;
}
void
freecmd(void)
{
int i;
while(cmdlist.nused > 0)
free(cmdlist.ucharptr[--cmdlist.nused]);
while(addrlist.nused > 0)
free(addrlist.ucharptr[--addrlist.nused]);
while(stringlist.nused>0){
i = --stringlist.nused;
freestring(stringlist.stringptr[i]);
}
}
void
okdelim(int c)
{
if(c=='\\' || ('a'<=c && c<='z')
|| ('A'<=c && c<='Z') || ('0'<=c && c<='9'))
editerror("bad delimiter %c\n", c);
}
void
atnl(void)
{
int c;
cmdskipbl();
c = getch();
if(c != '\n')
editerror("newline expected (saw %C)", c);
}
void
Straddc(String *s, int c)
{
if(s->n+1 >= s->nalloc){
s->nalloc += 10;
s->r = erealloc(s->r, s->nalloc*sizeof(Rune));
}
s->r[s->n++] = c;
s->r[s->n] = '\0';
}
void
getrhs(String *s, int delim, int cmd)
{
int c;
while((c = getch())>0 && c!=delim && c!='\n'){
if(c == '\\'){
if((c=getch()) <= 0)
error("bad right hand side");
if(c == '\n'){
ungetch();
c='\\';
}else if(c == 'n')
c='\n';
else if(c!=delim && (cmd=='s' || c!='\\')) /* s does its own */
Straddc(s, '\\');
}
Straddc(s, c);
}
ungetch(); /* let client read whether delimiter, '\n' or whatever */
}
String *
collecttoken(char *end)
{
String *s = newstring(0);
int c;
while((c=nextc())==' ' || c=='\t')
Straddc(s, getch()); /* blanks significant for getname() */
while((c=getch())>0 && utfrune(end, c)==0)
Straddc(s, c);
if(c != '\n')
atnl();
return s;
}
String *
collecttext(void)
{
String *s;
int begline, i, c, delim;
s = newstring(0);
if(cmdskipbl()=='\n'){
getch();
i = 0;
do{
begline = i;
while((c = getch())>0 && c!='\n')
i++, Straddc(s, c);
i++, Straddc(s, '\n');
if(c < 0)
goto Return;
}while(s->r[begline]!='.' || s->r[begline+1]!='\n');
s->r[s->n-2] = '\0';
s->n -= 2;
}else{
okdelim(delim = getch());
getrhs(s, delim, 'a');
if(nextc()==delim)
getch();
atnl();
}
Return:
return s;
}
int
cmdlookup(int c)
{
int i;
for(i=0; cmdtab[i].cmdc; i++)
if(cmdtab[i].cmdc == c)
return i;
return -1;
}
Cmd*
parsecmd(int nest)
{
int i, c;
struct cmdtab *ct;
Cmd *cp, *ncp;
Cmd cmd;
cmd.next = cmd.cmd = 0;
cmd.re = 0;
cmd.flag = cmd.num = 0;
cmd.addr = compoundaddr();
if(cmdskipbl() == -1)
return 0;
if((c=getch())==-1)
return 0;
cmd.cmdc = c;
if(cmd.cmdc=='c' && nextc()=='d'){ /* sleazy two-character case */
getch(); /* the 'd' */
cmd.cmdc='c'|0x100;
}
i = cmdlookup(cmd.cmdc);
if(i >= 0){
if(cmd.cmdc == '\n')
goto Return; /* let nl_cmd work it all out */
ct = &cmdtab[i];
if(ct->defaddr==aNo && cmd.addr)
editerror("command takes no address");
if(ct->count)
cmd.num = getnum(ct->count);
if(ct->regexp){
/* x without pattern -> .*\n, indicated by cmd.re==0 */
/* X without pattern is all files */
if((ct->cmdc!='x' && ct->cmdc!='X') ||
((c = nextc())!=' ' && c!='\t' && c!='\n')){
cmdskipbl();
if((c = getch())=='\n' || c<0)
editerror("no address");
okdelim(c);
cmd.re = getregexp(c);
if(ct->cmdc == 's'){
cmd.text = newstring(0);
getrhs(cmd.text, c, 's');
if(nextc() == c){
getch();
if(nextc() == 'g')
cmd.flag = getch();
}
}
}
}
if(ct->addr && (cmd.mtaddr=simpleaddr())==0)
editerror("bad address");
if(ct->defcmd){
if(cmdskipbl() == '\n'){
getch();
cmd.cmd = newcmd();
cmd.cmd->cmdc = ct->defcmd;
}else if((cmd.cmd = parsecmd(nest))==0)
error("defcmd");
}else if(ct->text)
cmd.text = collecttext();
else if(ct->token)
cmd.text = collecttoken(ct->token);
else
atnl();
}else
switch(cmd.cmdc){
case '{':
cp = 0;
do{
if(cmdskipbl()=='\n')
getch();
ncp = parsecmd(nest+1);
if(cp)
cp->next = ncp;
else
cmd.cmd = ncp;
}while(cp = ncp);
break;
case '}':
atnl();
if(nest==0)
editerror("right brace with no left brace");
return 0;
default:
editerror("unknown command %c", cmd.cmdc);
}
Return:
cp = newcmd();
*cp = cmd;
return cp;
}
String*
getregexp(int delim)
{
String *buf, *r;
int i, c;
buf = allocstring(0);
for(i=0; ; i++){
if((c = getch())=='\\'){
if(nextc()==delim)
c = getch();
else if(nextc()=='\\'){
Straddc(buf, c);
c = getch();
}
}else if(c==delim || c=='\n')
break;
if(i >= RBUFSIZE)
editerror("regular expression too long");
Straddc(buf, c);
}
if(c!=delim && c)
ungetch();
if(buf->n > 0){
patset = TRUE;
freestring(lastpat);
lastpat = buf;
}else
freestring(buf);
if(lastpat->n == 0)
editerror("no regular expression defined");
r = newstring(lastpat->n);
runemove(r->r, lastpat->r, lastpat->n); /* newstring put \0 at end */
return r;
}
Addr *
simpleaddr(void)
{
Addr addr;
Addr *ap, *nap;
addr.next = 0;
addr.left = 0;
switch(cmdskipbl()){
case '#':
addr.type = getch();
addr.num = getnum(1);
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
addr.num = getnum(1);
addr.type='l';
break;
case '/': case '?': case '"':
addr.re = getregexp(addr.type = getch());
break;
case '.':
case '$':
case '+':
case '-':
case '\'':
addr.type = getch();
break;
default:
return 0;
}
if(addr.next = simpleaddr())
switch(addr.next->type){
case '.':
case '$':
case '\'':
if(addr.type!='"')
case '"':
editerror("bad address syntax");
break;
case 'l':
case '#':
if(addr.type=='"')
break;
/* fall through */
case '/':
case '?':
if(addr.type!='+' && addr.type!='-'){
/* insert the missing '+' */
nap = newaddr();
nap->type='+';
nap->next = addr.next;
addr.next = nap;
}
break;
case '+':
case '-':
break;
default:
error("simpleaddr");
}
ap = newaddr();
*ap = addr;
return ap;
}
Addr *
compoundaddr(void)
{
Addr addr;
Addr *ap, *next;
addr.left = simpleaddr();
if((addr.type = cmdskipbl())!=',' && addr.type!=';')
return addr.left;
getch();
next = addr.next = compoundaddr();
if(next && (next->type==',' || next->type==';') && next->left==0)
editerror("bad address syntax");
ap = newaddr();
*ap = addr;
return ap;
}