ref: eb0e026c241bd3afc6a10a6e2c7417de1b91f7e8
dir: /libtk/tmark.c/
#include "lib9.h"
#include "draw.h"
#include "tk.h"
#include "textw.h"
#define istring u.string
#define iwin u.win
#define imark u.mark
#define iline u.line
static char* tktmarkgravity(Tk*, char*, char**);
static char* tktmarknames(Tk*, char*, char**);
static char* tktmarknext(Tk*, char*, char**);
static char* tktmarkprevious(Tk*, char*, char**);
static char* tktmarkset(Tk*, char*, char**);
static char* tktmarkunset(Tk*, char*, char**);
TkCmdtab
tktmarkcmd[] =
{
"gravity", tktmarkgravity,
"names", tktmarknames,
"next", tktmarknext,
"previous", tktmarkprevious,
"set", tktmarkset,
"unset", tktmarkunset,
nil
};
char*
tktaddmarkinfo(TkText *tkt, char *name, TkTmarkinfo **ret)
{
TkTmarkinfo *mi;
mi = malloc(sizeof(TkTmarkinfo));
if(mi == nil)
return TkNomem;
mi->name = strdup(name);
if(mi->name == nil) {
free(mi);
return TkNomem;
}
mi->gravity = Tkright;
mi->cur = nil;
mi->next = tkt->marks;
tkt->marks = mi;
*ret = mi;
return nil;
}
void
tktfreemarks(TkTmarkinfo *m)
{
TkTmarkinfo *n;
while(m != nil) {
n = m->next;
free(m->name);
free(m);
m = n;
}
}
TkTmarkinfo *
tktfindmark(TkTmarkinfo *m, char *name)
{
while(m != nil) {
if(strcmp(m->name, name) == 0)
return m;
m = m->next;
}
return nil;
}
int
tktmarkind(Tk *tk, char *name, TkTindex *ans)
{
TkTmarkinfo *mk;
TkText *tkt = TKobj(TkText, tk);
if(strcmp(name, "current") == 0) {
tktxyind(tk, tkt->current.x, tkt->current.y, ans);
return 1;
}
mk = tktfindmark(tkt->marks, name);
if(mk == nil || mk->cur == nil)
return 0;
ans->item = mk->cur;
ans->line = tktitemline(ans->item);
ans->pos = 0;
return 1;
}
char*
tktmarkparse(Tk *tk, char **parg, TkTmarkinfo **ret)
{
char *e, *buf;
TkText *tkt = TKobj(TkText, tk);
buf = mallocz(Tkmaxitem, 0);
if(buf == nil)
return TkNomem;
*parg = tkword(tk->env->top, *parg, buf, buf+Tkmaxitem, nil);
if(*buf == '\0') {
free(buf);
return TkOparg;
}
*ret = tktfindmark(tkt->marks, buf);
if(*ret == nil) {
e = tktaddmarkinfo(tkt, buf, ret);
if(e != nil) {
free(buf);
return e;
}
}
free(buf);
return nil;
}
/*
* Insert mark before ixnew, first removing it from old place, if any.
* Make sure ixnew continues to point after mark.
*/
char*
tktmarkmove(Tk *tk, TkTmarkinfo *m, TkTindex *ixnew)
{
char *e;
int deleted, split;
TkTitem *i;
TkTindex ix, pix;
TkText *tkt = TKobj(TkText, tk);
deleted = 0;
if(m->cur != nil) {
if(m->cur == ixnew->item)
return nil;
ix.item = m->cur;
ix.line = tktitemline(m->cur);
ix.pos = 0;
tktremitem(tkt, &ix);
deleted = 1;
}
/* XXX - Tad: memory leak on 'i' if something fails later? */
e = tktnewitem(TkTmark, 0, &i);
if(e != nil)
return e;
i->imark = m;
m->cur = i;
/* keep adjacent marks sorted: all rights, then all lefts */
if(m->gravity == Tkright) {
while(ixnew->item->kind == TkTmark && ixnew->item->imark->gravity == Tkleft)
if(!tktadjustind(tkt, TkTbyitem, ixnew))
break;
}
else {
for(;;) {
pix = *ixnew;
if(!tktadjustind(tkt, TkTbyitemback, &pix))
break;
if(pix.item->kind == TkTmark && pix.item->imark->gravity == Tkright)
*ixnew = pix;
else
break;
}
}
split = (ixnew->pos > 0);
e = tktsplititem(ixnew);
if(e != nil)
return e;
e = tktiteminsert(tkt, ixnew, i);
if(e != nil)
return nil;
if(strcmp(m->name, "insert") == 0 || split) {
if(deleted && ix.line != ixnew->line) {
tktfixgeom(tk, tktprevwrapline(tk, ix.line), ix.line, 0);
/*
* this is ok only because tktfixgeom cannot
* free mark items, and we know that i is a mark item.
*/
ixnew->item = i;
ixnew->line = tktitemline(i);
ixnew->pos = 0;
}
tktfixgeom(tk, tktprevwrapline(tk, ixnew->line), ixnew->line, 0);
tktextsize(tk, 1);
}
ixnew->item = i;
ixnew->line = tktitemline(i);
ixnew->pos = 0;
return nil;
}
/* Text Mark Commands (+ means implemented)
+gravity
+names
+next
+previous
+set
+unset
*/
static char*
tktmarkgravity(Tk *tk, char *arg, char **val)
{
char *e;
TkTmarkinfo *m;
char *buf;
e = tktmarkparse(tk, &arg, &m);
if(e != nil)
return e;
if(*arg == '\0')
return tkvalue(val, (m->gravity & Tkleft)? "left" : "right");
else {
buf = mallocz(Tkmaxitem, 0);
if(buf == nil)
return TkNomem;
tkword(tk->env->top, arg, buf, buf+Tkmaxitem, nil);
if(strcmp(buf, "left") == 0)
m->gravity = Tkleft;
else
if(strcmp(buf, "right") == 0)
m->gravity = Tkright;
else {
free(buf);
return TkBadcm;
}
free(buf);
}
return nil;
}
static char*
tktmarknames(Tk *tk, char *arg, char **val)
{
char *r, *fmt;
TkTmarkinfo *m;
TkText *tkt = TKobj(TkText, tk);
USED(arg);
fmt = "%s";
for(m = tkt->marks; m != nil; m = m->next) {
r = tkvalue(val, fmt, m->name);
if(r != nil)
return r;
fmt = " %s";
}
return nil;
}
static char*
tktmarknext(Tk *tk, char *arg, char **val)
{
char *e;
TkTmarkinfo *mix;
TkTindex ix, ixend;
TkText *tkt = TKobj(TkText, tk);
/* special behavior if specified index is a mark name */
mix = tktfindmark(tkt->marks, arg);
e = tktindparse(tk, &arg, &ix);
if(e != nil)
return e;
if(mix != nil)
tktadjustind(tkt, TkTbyitem, &ix);
/* special behavior if index is 'end' */
tktendind(tkt, &ixend);
if(tktindcompare(tkt, &ix, TkEq, &ixend)) {
do {
tktadjustind(tkt, TkTbyitemback, &ix);
} while(ix.item->kind == TkTmark);
}
do {
if(ix.item->kind == TkTmark)
return tkvalue(val, "%s", ix.item->imark->name);
} while(tktadjustind(tkt, TkTbyitem, &ix));
return nil;
}
static char*
tktmarkprevious(Tk *tk, char *arg, char **val)
{
char *e;
TkTindex ix;
TkText *tkt = TKobj(TkText, tk);
e = tktindparse(tk, &arg, &ix);
if(e != nil)
return e;
while(tktadjustind(tkt, TkTbyitemback, &ix)) {
if(ix.item->kind == TkTmark)
return tkvalue(val, "%s", ix.item->imark->name);
}
return nil;
}
/* XXX - Tad: possible memory leak here */
static char*
tktmarkset(Tk *tk, char *arg, char **val)
{
char *e;
TkTmarkinfo *m;
TkTindex ixnew;
USED(val);
e = tktmarkparse(tk, &arg, &m);
if(e != nil)
return e;
e = tktindparse(tk, &arg, &ixnew);
if(e != nil)
return e;
return tktmarkmove(tk, m, &ixnew);
}
static char*
tktmarkunset(Tk *tk, char *arg, char **val)
{
TkText *tkt;
TkTmarkinfo *m, **p;
TkTindex ix;
char *e;
int resize;
USED(val);
tkt = TKobj(TkText, tk);
e = tktmarkparse(tk, &arg, &m);
if(e != nil)
return e;
resize = 0;
while(m != nil) {
if(strcmp(m->name, "insert") == 0 || strcmp(m->name, "current") == 0)
return TkBadvl;
if(m->cur != nil) {
ix.item = m->cur;
ix.line = tktitemline(m->cur);
ix.pos = 0;
tktremitem(tkt, &ix);
tktfixgeom(tk, tktprevwrapline(tk, ix.line), ix.line, 0);
resize = 1;
}
for(p = &tkt->marks; *p != nil; p = &(*p)->next) {
if(*p == m) {
*p = m->next;
break;
}
}
m->next = nil;
tktfreemarks(m);
if(*arg != '\0') {
e = tktmarkparse(tk, &arg, &m);
if(e != nil)
return e;
}
else
m = nil;
}
if (resize)
tktextsize(tk, 1);
return nil;
}