ref: e16b4d85dd6b1cf14834387b765113114dabeae2
dir: /appl/acme/edit.b/
implement Edit;
include "common.m";
sys: Sys;
dat: Dat;
utils: Utils;
textm: Textm;
windowm: Windowm;
rowm: Rowm;
scroll: Scroll;
editlog: Editlog;
editcomd: Editcmd;
sprint, print: import sys;
FALSE, TRUE, BUFSIZE, Null, Empty, Inactive: import Dat;
warning, error, strchr: import utils;
Text: import textm;
File: import Filem;
Window: import windowm;
allwindows: import rowm;
scrdraw: import scroll;
elogterm, elogapply: import editlog;
cmdexec, resetxec: import editcomd;
init(mods : ref Dat->Mods)
{
sys = mods.sys;
dat = mods.dat;
utils = mods.utils;
textm = mods.textm;
windowm = mods.windowm;
rowm = mods.rowm;
scroll = mods.scroll;
editlog = mods.editlog;
editcomd = mods.editcmd;
editing = Inactive;
}
linex: con "\n";
wordx: con "\t\n";
cmdtab = array[28] of {
# cmdc text regexp addr defcmd defaddr count token fn
Cmdt ( '\n', 0, 0, 0, 0, aDot, 0, nil, C_nl ),
Cmdt ( 'a', 1, 0, 0, 0, aDot, 0, nil, C_a ),
Cmdt ( 'b', 0, 0, 0, 0, aNo, 0, linex, C_b ),
Cmdt ( 'c', 1, 0, 0, 0, aDot, 0, nil, C_c ),
Cmdt ( 'd', 0, 0, 0, 0, aDot, 0, nil, C_d ),
Cmdt ( 'e', 0, 0, 0, 0, aNo, 0, wordx, C_e ),
Cmdt ( 'f', 0, 0, 0, 0, aNo, 0, wordx, C_f ),
Cmdt ( 'g', 0, 1, 0, 'p', aDot, 0, nil, C_g ),
Cmdt ( 'i', 1, 0, 0, 0, aDot, 0, nil, C_i ),
Cmdt ( 'm', 0, 0, 1, 0, aDot, 0, nil, C_m ),
Cmdt ( 'p', 0, 0, 0, 0, aDot, 0, nil, C_p ),
Cmdt ( 'r', 0, 0, 0, 0, aDot, 0, wordx, C_e ),
Cmdt ( 's', 0, 1, 0, 0, aDot, 1, nil, C_s ),
Cmdt ( 't', 0, 0, 1, 0, aDot, 0, nil, C_m ),
Cmdt ( 'u', 0, 0, 0, 0, aNo, 2, nil, C_u ),
Cmdt ( 'v', 0, 1, 0, 'p', aDot, 0, nil, C_g ),
Cmdt ( 'w', 0, 0, 0, 0, aAll, 0, wordx, C_w ),
Cmdt ( 'x', 0, 1, 0, 'p', aDot, 0, nil, C_x ),
Cmdt ( 'y', 0, 1, 0, 'p', aDot, 0, nil, C_x ),
Cmdt ( '=', 0, 0, 0, 0, aDot, 0, linex, C_eq ),
Cmdt ( 'B', 0, 0, 0, 0, aNo, 0, linex, C_B ),
Cmdt ( 'D', 0, 0, 0, 0, aNo, 0, linex, C_D ),
Cmdt ( 'X', 0, 1, 0, 'f', aNo, 0, nil, C_X ),
Cmdt ( 'Y', 0, 1, 0, 'f', aNo, 0, nil, C_X ),
Cmdt ( '<', 0, 0, 0, 0, aDot, 0, linex, C_pipe ),
Cmdt ( '|', 0, 0, 0, 0, aDot, 0, linex, C_pipe ),
Cmdt ( '>', 0, 0, 0, 0, aDot, 0, linex, C_pipe ),
# deliberately unimplemented
# Cmdt ( 'k', 0, 0, 0, 0, aDot, 0, nil, C_k ),
# Cmdt ( 'n', 0, 0, 0, 0, aNo, 0, nil, C_n ),
# Cmdt ( 'q', 0, 0, 0, 0, aNo, 0, nil, C_q ),
# Cmdt ( '!', 0, 0, 0, 0, aNo, 0, linex, C_plan9 ),
Cmdt (0, 0, 0, 0, 0, 0, 0, nil, -1 )
};
cmdstartp: string;
cmdendp: int;
cmdp: int;
editerrc: chan of string;
lastpat : ref String;
patset: int;
# cmdlist: ref List;
# addrlist: ref List;
# stringlist: ref List;
editwaitproc(pid : int, sync: chan of int)
{
fd : ref Sys->FD;
n : int;
sys->pctl(Sys->FORKFD, nil);
w := sprint("#p/%d/wait", pid);
fd = sys->open(w, Sys->OREAD);
if (fd == nil)
error("fd == nil in editwaitproc");
sync <-= sys->pctl(0, nil);
buf := array[Sys->WAITLEN] of byte;
status := "";
for(;;){
if ((n = sys->read(fd, buf, len buf))<0)
error("bad read in editwaitproc");
status = string buf[0:n];
dat->cwait <-= status;
}
}
editthread()
{
cmdp: ref Cmd;
mypid := sys->pctl(0, nil);
sync := chan of int;
spawn editwaitproc(mypid, sync);
yourpid := <- sync;
while((cmdp=parsecmd(0)) != nil){
# ocurfile = curfile;
# loaded = curfile && !curfile->unread;
if(cmdexec(curtext, cmdp) == 0)
break;
freecmd();
}
editerrc <-= nil;
utils->postnote(Utils->PNPROC, mypid, yourpid, "kill");
}
allelogterm(w: ref Window)
{
elogterm(w.body.file);
}
alleditinit(w: ref Window)
{
w.tag.commit(TRUE);
w.body.commit(TRUE);
w.body.file.editclean = FALSE;
}
allupdate(w: ref Window)
{
t: ref Text;
i: int;
f: ref File;
t = w.body;
f = t.file;
if(f.curtext != t) # do curtext only
return;
if(f.elog.typex == Null)
elogterm(f);
else if(f.elog.typex != Empty){
elogapply(f);
if(f.editclean){
f.mod = FALSE;
for(i=0; i<f.ntext; i++)
f.text[i].w.dirty = FALSE;
}
t.setselect(t.q0, t.q1);
scrdraw(t);
w.settag();
}
}
editerror(s: string)
{
# print("%s", s);
freecmd();
allwindows(ALLELOGTERM, nil); # truncate the edit logs
editerrc <-= s;
exit;
}
editcmd(ct: ref Text, r: string, n: int)
{
err: string;
if(n == 0)
return;
if(2*n > BUFSIZE){
warning(nil, "string too long\n");
return;
}
allwindows(ALLEDITINIT, nil);
cmdstartp = r[0:n];
if(r[n-1] != '\n')
cmdstartp[n++] = '\n';
cmdendp = n;
cmdp = 0;
if(ct.w == nil)
curtext = nil;
else
curtext = ct.w.body;
resetxec();
if(editerrc == nil){
editerrc = chan of string;
lastpat = allocstring(0);
}
spawn editthread();
err = <- editerrc;
editing = Inactive;
if(err != nil)
warning(nil, sprint("Edit: %s\n", err));
# update everyone whose edit log has data
allwindows(ALLUPDATE, nil);
}
getch(): int
{
if(cmdp == cmdendp)
return -1;
return cmdstartp[cmdp++];
}
nextc(): int
{
if(cmdp == cmdendp)
return -1;
return cmdstartp[cmdp];
}
ungetch()
{
if(--cmdp < 0)
error("ungetch");
}
getnum(signok: int): int
{
n: int;
c, sign: int;
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;
}
cmdskipbl(): int
{
c: int;
do
c = getch();
while(c==' ' || c=='\t');
if(c >= 0)
ungetch();
return c;
}
# Check that list has room for one more element.
# growlist(l: ref List)
# {
# if(l.elems == nil || l.nalloc==0){
# l.nalloc = INCR;
# l.elems = array[INCR] of Listelement;
# l.nused = 0;
# }else if(l.nused == l.nalloc){
# old := l.elems;
# l.elems = array[l.nalloc+INCR] of Listelement;
# l.elems[0:] = old[0:l.nalloc];
# l.nalloc += INCR;
# }
# }
# Remove the ith element from the list
# dellist(l: ref List, i: int)
# {
# l.elems[i:] = l.elems[i+1:l.nused];
# l.nused--;
# }
# Add a new element, whose position is i, to the list
# inslist(l: ref List, i: int, val: int)
# {
# growlist(l);
# l.elems[i+1:] = l.elems[i:l.nused];
# l.elems[i] = val;
# l.nused++;
# }
# listfree(l: ref List)
# {
# l.elems = nil;
# }
allocstring(n: int): ref String
{
s: ref String;
s = ref String;
s.n = n;
s.r = string array[s.n] of { * => byte '\0' };
return s;
}
freestring(s: ref String)
{
s.r = nil;
}
newcmd(): ref Cmd
{
p: ref Cmd;
p = ref Cmd;
# inslist(cmdlist, cmdlist.nused, p);
return p;
}
newstring(n: int): ref String
{
p: ref String;
p = allocstring(n);
# inslist(stringlist, stringlist.nused, p);
return p;
}
newaddr(): ref Addr
{
p: ref Addr;
p = ref Addr;
# inslist(addrlist, addrlist.nused, p);
return p;
}
freecmd()
{
# i: int;
# cmdlist.elems = nil;
# addrlist.elems = nil;
# stringlist.elems = nil;
# cmdlist.nused = addrlist.nused = stringlist.nused = 0;
}
okdelim(c: int)
{
if(c=='\\' || ('a'<=c && c<='z')
|| ('A'<=c && c<='Z') || ('0'<=c && c<='9'))
editerror(sprint("bad delimiter %c\n", c));
}
atnl()
{
c: int;
cmdskipbl();
c = getch();
if(c != '\n')
editerror(sprint("newline expected (saw %c)", c));
}
Straddc(s: ref String, c: int)
{
s.r[s.n++] = c;
}
getrhs(s: ref String, delim: int, cmd: int)
{
c: int;
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
}
collecttoken(end: string): ref String
{
c: int;
s := newstring(0);
while((c=nextc())==' ' || c=='\t')
Straddc(s, getch()); # blanks significant for getname()
while((c=getch())>0 && strchr(end, c)<0)
Straddc(s, c);
if(c != '\n')
atnl();
return s;
}
collecttext(): ref String
{
s: ref String;
begline, i, c, delim: int;
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)
return s;
}while(s.r[begline]!='.' || s.r[begline+1]!='\n');
s.r[s.n-2] = '\0';
}else{
okdelim(delim = getch());
getrhs(s, delim, 'a');
if(nextc()==delim)
getch();
atnl();
}
return s;
}
cmdlookup(c: int): int
{
i: int;
for(i=0; cmdtab[i].cmdc; i++)
if(cmdtab[i].cmdc == c)
return i;
return -1;
}
parsecmd(nest: int): ref Cmd
{
i, c: int;
cp, ncp: ref Cmd;
cmd: ref Cmd;
cmd = ref Cmd;
cmd.next = cmd.cmd = nil;
cmd.re = nil;
cmd.flag = cmd.num = 0;
cmd.addr = compoundaddr();
if(cmdskipbl() == -1)
return nil;
if((c=getch())==-1)
return nil;
cmd.cmdc = c;
if(cmd.cmdc=='c' && nextc()=='d'){ # sleazy two-character case
getch(); # the 'd'
cmd.cmdc='c'|16r100;
}
i = cmdlookup(cmd.cmdc);
if(i >= 0){
if(cmd.cmdc == '\n'){
cp = newcmd();
*cp = *cmd;
return cp;
# let nl_cmd work it all out
}
ct := cmdtab[i];
if(ct.defaddr==aNo && cmd.addr != nil)
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())==nil)
editerror("bad address");
if(ct.defcmd){
if(cmdskipbl() == '\n'){
getch();
cmd.cmd = newcmd();
cmd.cmd.cmdc = ct.defcmd;
}else if((cmd.cmd = parsecmd(nest))==nil)
error("defcmd");
}else if(ct.text)
cmd.text = collecttext();
else if(ct.token != nil)
cmd.text = collecttoken(ct.token);
else
atnl();
}else
case(cmd.cmdc){
'{' =>
cp = nil;
do{
if(cmdskipbl()=='\n')
getch();
ncp = parsecmd(nest+1);
if(cp != nil)
cp.next = ncp;
else
cmd.cmd = ncp;
}while((cp = ncp) != nil);
break;
'}' =>
atnl();
if(nest==0)
editerror("right brace with no left brace");
return nil;
'c'|16r100 =>
editerror("unimplemented command cd");
* =>
editerror(sprint("unknown command %c", cmd.cmdc));
}
cp = newcmd();
*cp = *cmd;
return cp;
}
getregexp(delim: int): ref String
{
buf, r: ref String;
i, c: int;
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 >= BUFSIZE)
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);
k := lastpat.n;
for(j := 0; j < k; j++)
r.r[j] = lastpat.r[j]; # newstring put \0 at end
return r;
}
simpleaddr(): ref Addr
{
addr: Addr;
ap, nap: ref Addr;
addr.next = nil;
addr.left = nil;
case(cmdskipbl()){
'#' =>
addr.typex = getch();
addr.num = getnum(1);
break;
'0' to '9' =>
addr.num = getnum(1);
addr.typex='l';
break;
'/' or '?' or '"' =>
addr.re = getregexp(addr.typex = getch());
break;
'.' or
'$' or
'+' or
'-' or
'\'' =>
addr.typex = getch();
break;
* =>
return nil;
}
if((addr.next = simpleaddr()) != nil)
case(addr.next.typex){
'.' or
'$' or
'\'' =>
if(addr.typex!='"')
editerror("bad address syntax");
break;
'"' =>
editerror("bad address syntax");
break;
'l' or
'#' =>
if(addr.typex=='"')
break;
if(addr.typex!='+' && addr.typex!='-'){
# insert the missing '+'
nap = newaddr();
nap.typex='+';
nap.next = addr.next;
addr.next = nap;
}
break;
'/' or
'?' =>
if(addr.typex!='+' && addr.typex!='-'){
# insert the missing '+'
nap = newaddr();
nap.typex='+';
nap.next = addr.next;
addr.next = nap;
}
break;
'+' or
'-' =>
break;
* =>
error("simpleaddr");
}
ap = newaddr();
*ap = addr;
return ap;
}
compoundaddr(): ref Addr
{
addr: Addr;
ap, next: ref Addr;
addr.left = simpleaddr();
if((addr.typex = cmdskipbl())!=',' && addr.typex!=';')
return addr.left;
getch();
next = addr.next = compoundaddr();
if(next != nil && (next.typex==',' || next.typex==';') && next.left==nil)
editerror("bad address syntax");
ap = newaddr();
*ap = addr;
return ap;
}