ref: 4ae95680d7cf09182aa783cc934ca6c46e56a8b5
dir: /text.c/
#include "inc.h"
enum
{
HiWater = 640000, /* max size of history */
LoWater = 400000, /* min size of history after max'ed */
MinWater = 20000, /* room to leave available when reallocating */
};
void
xinit(Text *x, Rectangle textr, Rectangle scrollr, Font *ft, Image *b, Image **cols)
{
frinit(x, textr, ft, b, cols);
x->i = b;
x->scrollr = scrollr;
x->lastsr = ZR;
xfill(x);
xsetselect(x, x->q0, x->q1);
xscrdraw(x);
}
void
xsetrects(Text *x, Rectangle textr, Rectangle scrollr)
{
frsetrects(x, textr, x->b);
x->scrollr = scrollr;
}
void
xclear(Text *x)
{
free(x->r);
x->r = nil;
x->nr = 0;
free(x->raw);
x->r = nil;
x->nraw = 0;
frclear(x, TRUE);
};
void
xredraw(Text *x)
{
frredraw(x);
xscrdraw(x);
}
void
xfullredraw(Text *x)
{
xfill(x);
x->ticked = 0;
if(x->p0 > 0)
frdrawsel(x, frptofchar(x, 0), 0, x->p0, 0);
if(x->p1 < x->nchars)
frdrawsel(x, frptofchar(x, x->p1), x->p1, x->nchars, 0);
frdrawsel(x, frptofchar(x, x->p0), x->p0, x->p1, 1);
x->lastsr = ZR;
xscrdraw(x);
}
uint
xinsert(Text *w, Rune *r, int n, uint q0)
{
uint m;
if(n == 0)
return q0;
if(w->nr+n>HiWater && q0>=w->org && q0>=w->qh){
m = min(HiWater-LoWater, min(w->org, w->qh));
w->org -= m;
w->qh -= m;
if(w->q0 > m)
w->q0 -= m;
else
w->q0 = 0;
if(w->q1 > m)
w->q1 -= m;
else
w->q1 = 0;
w->nr -= m;
runemove(w->r, w->r+m, w->nr);
q0 -= m;
}
if(w->nr+n > w->maxr){
/*
* Minimize realloc breakage:
* Allocate at least MinWater
* Double allocation size each time
* But don't go much above HiWater
*/
m = max(min(2*(w->nr+n), HiWater), w->nr+n)+MinWater;
if(m > HiWater)
m = max(HiWater+MinWater, w->nr+n);
if(m > w->maxr){
w->r = runerealloc(w->r, m);
w->maxr = m;
}
}
runemove(w->r+q0+n, w->r+q0, w->nr-q0);
runemove(w->r+q0, r, n);
w->nr += n;
/* if output touches, advance selection, not qh; works best for keyboard and output */
if(q0 <= w->q1)
w->q1 += n;
if(q0 <= w->q0)
w->q0 += n;
if(q0 < w->qh)
w->qh += n;
if(q0 < w->org)
w->org += n;
else if(q0 <= w->org+w->nchars)
frinsert(w, r, r+n, q0-w->org);
xscrdraw(w);
return q0;
}
void
xfill(Text *w)
{
Rune *rp;
int i, n, m, nl;
while(w->lastlinefull == FALSE){
n = w->nr-(w->org+w->nchars);
if(n == 0)
break;
if(n > 2000) /* educated guess at reasonable amount */
n = 2000;
rp = w->r+(w->org+w->nchars);
/*
* it's expensive to frinsert more than we need, so
* count newlines.
*/
nl = w->maxlines-w->nlines;
m = 0;
for(i=0; i<n; ){
if(rp[i++] == '\n'){
m++;
if(m >= nl)
break;
}
}
frinsert(w, rp, rp+i, w->nchars);
}
}
void
xdelete(Text *w, uint q0, uint q1)
{
uint n, p0, p1;
n = q1-q0;
if(n == 0)
return;
runemove(w->r+q0, w->r+q1, w->nr-q1);
w->nr -= n;
if(q0 < w->q0)
w->q0 -= min(n, w->q0-q0);
if(q0 < w->q1)
w->q1 -= min(n, w->q1-q0);
if(q1 < w->qh)
w->qh -= n;
else if(q0 < w->qh)
w->qh = q0;
if(q1 <= w->org)
w->org -= n;
else if(q0 < w->org+w->nchars){
p1 = q1 - w->org;
if(p1 > w->nchars)
p1 = w->nchars;
if(q0 < w->org){
w->org = q0;
p0 = 0;
}else
p0 = q0 - w->org;
frdelete(w, p0, p1);
xfill(w);
}
}
void
xsetselect(Text *w, uint q0, uint q1)
{
int p0, p1;
w->posx = -1;
/* w->p0 and w->p1 are always right; w->q0 and w->q1 may be off */
w->q0 = q0;
w->q1 = q1;
/* compute desired p0,p1 from q0,q1 */
p0 = q0-w->org;
p1 = q1-w->org;
if(p0 < 0)
p0 = 0;
if(p1 < 0)
p1 = 0;
if(p0 > w->nchars)
p0 = w->nchars;
if(p1 > w->nchars)
p1 = w->nchars;
if(p0==w->p0 && p1==w->p1)
return;
/* screen disagrees with desired selection */
if(w->p1<=p0 || p1<=w->p0 || p0==p1 || w->p1==w->p0){
/* no overlap or too easy to bother trying */
frdrawsel(w, frptofchar(w, w->p0), w->p0, w->p1, 0);
frdrawsel(w, frptofchar(w, p0), p0, p1, 1);
goto Return;
}
/* overlap; avoid unnecessary painting */
if(p0 < w->p0){
/* extend selection backwards */
frdrawsel(w, frptofchar(w, p0), p0, w->p0, 1);
}else if(p0 > w->p0){
/* trim first part of selection */
frdrawsel(w, frptofchar(w, w->p0), w->p0, p0, 0);
}
if(p1 > w->p1){
/* extend selection forwards */
frdrawsel(w, frptofchar(w, w->p1), w->p1, p1, 1);
}else if(p1 < w->p1){
/* trim last part of selection */
frdrawsel(w, frptofchar(w, p1), p1, w->p1, 0);
}
Return:
w->p0 = p0;
w->p1 = p1;
}
static void
xsetorigin(Text *w, uint org, int exact)
{
int i, a, fixup;
Rune *r;
uint n;
if(org>0 && !exact){
/* org is an estimate of the char posn; find a newline */
/* don't try harder than 256 chars */
for(i=0; i<256 && org<w->nr; i++){
if(w->r[org] == '\n'){
org++;
break;
}
org++;
}
}
a = org-w->org;
fixup = 0;
if(a>=0 && a<w->nchars){
frdelete(w, 0, a);
fixup = 1; /* frdelete can leave end of last line in wrong selection mode; it doesn't know what follows */
}else if(a<0 && -a<w->nchars){
n = w->org - org;
r = w->r+org;
frinsert(w, r, r+n, 0);
}else
frdelete(w, 0, w->nchars);
w->org = org;
xfill(w);
xscrdraw(w);
xsetselect(w, w->q0, w->q1);
if(fixup && w->p1 > w->p0)
frdrawsel(w, frptofchar(w, w->p1-1), w->p1-1, w->p1, 1);
}
/*
* Scrolling
*/
static Rectangle
scrpos(Rectangle r, uint p0, uint p1, uint tot)
{
Rectangle q;
int h;
q = r;
h = q.max.y-q.min.y;
if(tot == 0)
return q;
if(tot > 1024*1024){
tot>>=10;
p0>>=10;
p1>>=10;
}
if(p0 > 0)
q.min.y += h*p0/tot;
if(p1 < tot)
q.max.y -= h*(tot-p1)/tot;
if(q.max.y < q.min.y+2){
if(q.min.y+2 <= r.max.y)
q.max.y = q.min.y+2;
else
q.min.y = q.max.y-2;
}
return q;
}
void
xscrdraw(Text *w)
{
Rectangle r1, r2;
if(w->i == nil)
return;
r1 = w->scrollr;
r2 = scrpos(r1, w->org, w->org+w->nchars, w->nr);
if(!eqrect(r2, w->lastsr)){
w->lastsr = r2;
draw(w->i, r1, w->cols[BORD], nil, ZP);
draw(w->i, insetrect(r2,1), w->cols[BACK], nil, ZP);
}
}
static uint
xbacknl(Text *w, uint p, uint n)
{
int i, j;
/* look for start of this line if n==0 */
if(n==0 && p>0 && w->r[p-1]!='\n')
n = 1;
i = n;
while(i-->0 && p>0){
--p; /* it's at a newline now; back over it */
if(p == 0)
break;
/* at 128 chars, call it a line anyway */
for(j=128; --j>0 && p>0; p--)
if(w->r[p-1]=='\n')
break;
}
return p;
}
static void
xscrsleep(Mousectl *mc, uint dt)
{
Timer *timer;
int y, b;
static Alt alts[3];
if(display->bufp > display->buf)
flushimage(display, 1);
timer = timerstart(dt);
y = mc->xy.y;
b = mc->buttons;
alts[0] = ALT(timer->c, nil, CHANRCV);
alts[1] = ALT(mc->c, &mc->Mouse, CHANRCV);
alts[2].op = CHANEND;
for(;;)
switch(alt(alts)){
case 0:
timerstop(timer);
return;
case 1:
if(abs(mc->xy.y-y)>2 || mc->buttons!=b){
timercancel(timer);
return;
}
break;
}
}
void
xscroll(Text *w, Mousectl *mc, int but)
{
uint p0, oldp0;
Rectangle s;
int y, my, h, first;
s = insetrect(w->scrollr, 1);
h = s.max.y-s.min.y;
oldp0 = ~0;
first = TRUE;
do{
my = mc->xy.y;
if(my < s.min.y)
my = s.min.y;
if(my >= s.max.y)
my = s.max.y;
if(but == 2){
y = my;
if(y > s.max.y-2)
y = s.max.y-2;
if(w->nr > 1024*1024)
p0 = ((w->nr>>10)*(y-s.min.y)/h)<<10;
else
p0 = w->nr*(y-s.min.y)/h;
if(oldp0 != p0)
xsetorigin(w, p0, FALSE);
oldp0 = p0;
readmouse(mc);
continue;
}
if(but == 1 || but == 4){
y = max(1, (my-s.min.y)/w->font->height);
p0 = xbacknl(w, w->org, y);
}else{
y = max(my, s.min.y+w->font->height);
p0 = w->org+frcharofpt(w, Pt(s.max.x, y));
}
if(oldp0 != p0)
xsetorigin(w, p0, TRUE);
oldp0 = p0;
/* debounce */
if(first){
if(display->bufp > display->buf)
flushimage(display, 1);
if(but > 3)
return;
sleep(200);
nbrecv(mc->c, &mc->Mouse);
first = FALSE;
}
xscrsleep(mc, 100);
}while(mc->buttons & (1<<(but-1)));
while(mc->buttons)
readmouse(mc);
}
void
xscrolln(Text *x, int n)
{
uint q0;
if(n < 0)
q0 = xbacknl(x, x->org, -n);
else
q0 = x->org+frcharofpt(x, Pt(x->Frame.r.min.x, x->Frame.r.min.y+n*x->font->height));
xsetorigin(x, q0, TRUE);
}
/* move tick up or down while staying at the same x position */
void
xtickupdn(Text *x, int d)
{
Point p;
int py;
uint q0;
xshow(x, x->q0);
p = frptofchar(x, x->q0-x->org);
if(x->posx >= 0)
p.x = x->posx;
py = p.y;
p.y += d*x->font->height;
if(p.y < x->Frame.r.min.y ||
p.y > x->Frame.r.max.y-x->font->height){
xscrolln(x, d);
p.y = py;
}
q0 = x->org+frcharofpt(x, p);
xsetselect(x, q0, q0);
x->posx = p.x;
}
static Text *selecttext;
static Mousectl *selectmc;
static uint selectq;
static void
xframescroll(Text *x, int dl)
{
uint endq;
if(dl == 0){
xscrsleep(selectmc, 100);
return;
}
if(dl < 0){
endq = x->org+x->p0;
}else{
if(x->org+x->nchars == x->nr)
return;
endq = x->org+x->p1;
}
xscrolln(x, dl);
xsetselect(x, min(selectq, endq), max(selectq, endq));
}
static void
framescroll(Frame *f, int dl)
{
if(f != &selecttext->Frame)
panic("frameselect not right frame");
xframescroll(selecttext, dl);
}
/*
* Selection and deletion helpers
*/
int
iswordrune(Rune r)
{
return isalpharune(r) || isdigitrune(r);
}
static int
xbswidth(Text *w, Rune c)
{
uint q, stop;
Rune r;
int wd, inword;
/* there is known to be at least one character to erase */
if(c == Kbs) /* ^H: erase character */
return 1;
q = w->q0;
stop = 0;
if(q > w->qh)
stop = w->qh;
inword = FALSE;
while(q > stop){
r = w->r[q-1];
if(r == '\n'){ /* eat at most one more character */
if(q == w->q0) /* eat the newline */
--q;
break;
}
/* ^W: erase word.
* delete a bunch of non-word characters
* followed by word characters */
if(c == CTRL('W')){
wd = iswordrune(r);
if(wd && !inword)
inword = TRUE;
else if(!wd && inword)
break;
}
--q;
}
return w->q0-q;
}
static Rune left1[] = { L'{', L'[', L'(', L'<', L'«', 0 };
static Rune right1[] = { L'}', L']', L')', L'>', L'»', 0 };
static Rune left2[] = { L'\n', 0 };
static Rune left3[] = { L'\'', L'"', L'`', 0 };
static Rune *left[] = {
left1,
left2,
left3,
nil
};
static Rune *right[] = {
right1,
left2,
left3,
nil
};
static int
xclickmatch(Text *x, int cl, int cr, int dir, uint *q)
{
Rune c;
int nest;
nest = 1;
for(;;){
if(dir > 0){
if(*q == x->nr)
break;
c = x->r[*q];
(*q)++;
}else{
if(*q == 0)
break;
(*q)--;
c = x->r[*q];
}
if(c == cr){
if(--nest==0)
return 1;
}else if(c == cl)
nest++;
}
return cl=='\n' && nest==1;
}
static int
inmode(Rune r, int mode)
{
return (mode == 1) ? iswordrune(r) : r && !isspacerune(r);
}
static void
xstretchsel(Text *x, uint pt, uint *q0, uint *q1, int mode)
{
int c, i;
Rune *r, *l, *p;
uint q;
*q0 = pt;
*q1 = pt;
for(i=0; left[i]!=nil; i++){
q = *q0;
l = left[i];
r = right[i];
/* try matching character to left, looking right */
if(q == 0)
c = '\n';
else
c = x->r[q-1];
p = runestrchr(l, c);
if(p != nil){
if(xclickmatch(x, c, r[p-l], 1, &q))
*q1 = q-(c!='\n');
return;
}
/* try matching character to right, looking left */
if(q == x->nr)
c = '\n';
else
c = x->r[q];
p = runestrchr(r, c);
if(p != nil){
if(xclickmatch(x, c, l[p-r], -1, &q)){
*q1 = *q0+(*q0<x->nr && c=='\n');
*q0 = q;
if(c!='\n' || q!=0 || x->r[0]=='\n')
(*q0)++;
}
return;
}
}
/* try filling out word to right */
while(*q1<x->nr && inmode(x->r[*q1], mode))
(*q1)++;
/* try filling out word to left */
while(*q0>0 && inmode(x->r[*q0-1], mode))
(*q0)--;
}
static Mouse lastclick;
static Text *clickfrm;
static uint clickcount;
/* should be called with button 1 down */
void
xselect(Text *x, Mousectl *mc)
{
uint q0, q1;
int dx, dy, dt, b;
/* reset click state if mouse is too different from last time */
dx = abs(mc->xy.x - lastclick.xy.x);
dy = abs(mc->xy.y - lastclick.xy.y);
dt = mc->msec - lastclick.msec;
if(x != clickfrm || dx > 3 || dy > 3 || dt >= 500)
clickcount = 0;
/* first button down can be a dragging selection or a click.
* subsequent buttons downs can only be clicks.
* both cases can be ended by chording. */
selectq = x->org+frcharofpt(x, mc->xy);
if(clickcount == 0){
/* what a kludge - can this be improved? */
selecttext = x;
selectmc = mc;
x->scroll = framescroll;
frselect(x, mc);
/* this is correct if the whole selection is visible */
q0 = x->org + x->p0;
q1 = x->org + x->p1;
/* otherwise replace one end with selectq */
if(selectq < x->org)
q0 = selectq;
if(selectq > x->org+x->nchars)
q1 = selectq;
xsetselect(x, q0, q1);
/* figure out whether it was a click */
if(q0 == q1 && mc->buttons == 0){
clickcount = 1;
clickfrm = x;
}
}else{
clickcount++;
xstretchsel(x, selectq, &q0, &q1, min(clickcount-1, 2));
xsetselect(x, q0, q1);
if(clickcount >= 3)
clickcount = 0;
b = mc->buttons;
while(mc->buttons == b)
readmouse(mc);
}
lastclick = mc->Mouse; /* a bit unsure if this is correct */
/* chording */
while(mc->buttons){
clickcount = 0;
b = mc->buttons;
if(b & 6){
if(b & 2){
xsnarf(x);
xcut(x);
}else{
xpaste(x);
}
}
while(mc->buttons == b)
readmouse(mc);
}
}
void
xshow(Text *w, uint q0)
{
int qe;
int nl;
uint q;
qe = w->org+w->nchars;
if(w->org<=q0 && (q0<qe || (q0==qe && qe==w->nr)))
xscrdraw(w);
else{
nl = 4*w->maxlines/5;
q = xbacknl(w, q0, nl);
/* avoid going backwards if trying to go forwards - long lines! */
if(!(q0>w->org && q<w->org))
xsetorigin(w, q, TRUE);
while(q0 > w->org+w->nchars)
xsetorigin(w, w->org+1, FALSE);
}
}
void
xplacetick(Text *x, uint q)
{
xsetselect(x, q, q);
xshow(x, q);
}
void
xtype(Text *x, Rune r)
{
uint q0, q1;
int nb;
xsnarf(x);
xcut(x);
switch(r){
case CTRL('H'): /* erase character */
case CTRL('W'): /* erase word */
case CTRL('U'): /* erase line */
if(x->q0==0 || x->q0==x->qh)
return;
nb = xbswidth(x, r);
q1 = x->q0;
q0 = q1-nb;
if(q0 < x->org){
q0 = x->org;
nb = q1-q0;
}
if(nb > 0){
xdelete(x, q0, q0+nb);
xsetselect(x, q0, q0);
}
break;
default:
xinsert(x, &r, 1, x->q0);
xshow(x, x->q0);
break;
}
}
int
xninput(Text *x)
{
uint q;
Rune r;
for(q = x->qh; q < x->nr; q++){
r = x->r[q];
if(r == '\n')
return q - x->qh + 1;
if(r == CTRL('D'))
return q - x->qh;
}
return -1;
}
void
xaddraw(Text *x, Rune *r, int nr)
{
x->raw = runerealloc(x->raw, x->nraw+nr);
runemove(x->raw+x->nraw, r, nr);
x->nraw += nr;
}
/* TODO: maybe pass what we're looking for in a string */
void
xlook(Text *x)
{
int i, n, e;
i = x->q1;
n = i - x->q0;
e = x->nr - n;
if(n <= 0 || e < n)
return;
if(i > e)
i = 0;
while(runestrncmp(x->r+x->q0, x->r+i, n) != 0){
if(i < e)
i++;
else
i = 0;
}
xsetselect(x, i, i+n);
xshow(x, i);
}
Rune *snarf;
int nsnarf;
int snarfversion;
int snarffd;
void
xsnarf(Text *x)
{
if(x->q1 == x->q0)
return;
nsnarf = x->q1-x->q0;
snarf = runerealloc(snarf, nsnarf);
snarfversion++;
runemove(snarf, x->r+x->q0, nsnarf);
putsnarf();
}
void
xcut(Text *x)
{
if(x->q1 == x->q0)
return;
xdelete(x, x->q0, x->q1);
xsetselect(x, x->q0, x->q0);
xscrdraw(x);
}
void
xpaste(Text *x)
{
uint q0;
getsnarf();
if(nsnarf == 0)
return;
xcut(x);
q0 = x->q0;
if(x->rawmode && q0==x->nr){
xaddraw(x, snarf, nsnarf);
xsetselect(x, q0, q0);
}else{
q0 = xinsert(x, snarf, nsnarf, x->q0);
xsetselect(x, q0, q0+nsnarf);
}
xscrdraw(x);
}
void
xsend(Text *x)
{
getsnarf();
xsnarf(x);
if(nsnarf == 0)
return;
if(x->rawmode){
xaddraw(x, snarf, nsnarf);
if(snarf[nsnarf-1]!='\n' && snarf[nsnarf-1]!=CTRL('D'))
xaddraw(x, L"\n", 1);
}else{
xinsert(x, snarf, nsnarf, x->nr);
if(snarf[nsnarf-1]!='\n' && snarf[nsnarf-1]!=CTRL('D'))
xinsert(x, L"\n", 1, x->nr);
}
xplacetick(x, x->nr);
}
int
xplumb(Text *w, char *src, char *dir, int maxsize)
{
Plumbmsg *m;
static int fd = -2;
char buf[32];
uint p0, p1;
if(fd == -2)
fd = plumbopen("send", OWRITE|OCEXEC);
if(fd < 0)
return 0;
m = emalloc(sizeof(Plumbmsg));
m->src = estrdup(src);
m->dst = nil;
m->wdir = estrdup(dir);
m->type = estrdup("text");
p0 = w->q0;
p1 = w->q1;
if(w->q1 > w->q0)
m->attr = nil;
else{
while(p0>0 && w->r[p0-1]!=' ' && w->r[p0-1]!='\t' && w->r[p0-1]!='\n')
p0--;
while(p1<w->nr && w->r[p1]!=' ' && w->r[p1]!='\t' && w->r[p1]!='\n')
p1++;
snprint(buf, sizeof(buf), "click=%d", w->q0-p0);
m->attr = plumbunpackattr(buf);
}
if(p1-p0 > maxsize){
plumbfree(m);
return 0; /* too large for 9P */
}
m->data = smprint("%.*S", p1-p0, w->r+p0);
m->ndata = strlen(m->data);
if(plumbsend(fd, m) < 0){
plumbfree(m);
return 1;
}
plumbfree(m);
return 0;
}