ref: a291bbdeddfd41a2f0907ecbd7b819f0eedffdaf
dir: /sys/src/cmd/abaco/text.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
#include <thread.h>
#include <cursor.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include <plumb.h>
#include <html.h>
#include "dat.h"
#include "fns.h"
Image *tagcols[NCOL];
Image *textcols[NCOL];
void
textinit(Text *t, Image *b, Rectangle r, Font *f, Image *cols[NCOL])
{
t->all = r;
t->scrollr = r;
t->scrollr.max.x = r.min.x+Scrollsize;
t->lastsr = ZR;
r.min.x += Scrollsize+Scrollgap;
t->rs.nr = 0;
memmove(t->Frame.cols, cols, sizeof t->Frame.cols);
textredraw(t, r, f, b);
}
void
textredraw(Text *t, Rectangle r, Font *f, Image *b)
{
Rectangle r1;
frinit(t, r, f, b, t->Frame.cols);
r1 = t->r;
r1.min.x -= Scrollsize+Scrollgap; /* back fill to scroll bar */
draw(t->b, r1, t->cols[BACK], nil, ZP);
t->maxtab = Maxtab*stringwidth(f, "0");
textfill(t);
textsetselect(t, t->q0, t->q1);
}
int
textresize(Text *t, Image *b, Rectangle r)
{
if(Dy(r) > 0)
r.max.y -= Dy(r)%t->font->height;
else
r.max.y = r.min.y;
t->all = r;
t->scrollr = r;
t->scrollr.max.x = r.min.x+Scrollsize;
t->lastsr = ZR;
r.min.x += Scrollsize+Scrollgap;
frclear(t, 0);
textredraw(t, r, t->font, b);
if(t->what == Textarea)
textscrdraw(t);
return r.max.y;
}
void
textclose(Text *t)
{
closerunestr(&t->rs);
frclear(t, 1);
}
void
textinsert(Text *t, uint q0, Rune *r, uint n)
{
if(n == 0)
return;
t->rs.r = runerealloc(t->rs.r, t->rs.nr+n);
runemove(t->rs.r+q0+n, t->rs.r+q0, t->rs.nr-q0);
runemove(t->rs.r+q0, r, n);
t->rs.nr += n;
if(q0 < t->q1)
t->q1 += n;
if(q0 < t->q0)
t->q0 += n;
if(q0 < t->org)
t->org += n;
else if(q0 <= t->org+t->nchars)
frinsert(t, r, r+n, q0-t->org);
}
void
textfill(Text *t)
{
Rune *rp;
int i, n, m, nl;
if(t->lastlinefull)
return;
rp = runemalloc(BUFSIZE*8);
do{
n = t->rs.nr-(t->org+t->nchars);
if(n == 0)
break;
if(n > 2000) /* educated guess at reasonable amount */
n = 2000;
runemove(rp, t->rs.r+(t->org+t->nchars), n);
/*
* it's expensive to frinsert more than we need, so
* count newlines.
*/
nl = t->maxlines-t->nlines;
m = 0;
for(i=0; i<n; ){
if(rp[i++] == '\n'){
m++;
if(m >= nl)
break;
}
}
frinsert(t, rp, rp+i, t->nchars);
}while(t->lastlinefull == FALSE);
free(rp);
}
void
textdelete(Text *t, uint q0, uint q1)
{
uint n, p0, p1;
n = q1-q0;
if(n == 0)
return;
runemove(t->rs.r+q0, t->rs.r+q1, t->rs.nr-q1);
t->rs.nr -= n;
if(q0 < t->q0)
t->q0 -= min(n, t->q0-q0);
if(q0 < t->q1)
t->q1 -= min(n, t->q1-q0);
if(q1 <= t->org)
t->org -= n;
else if(q0 < t->org+t->nchars){
p1 = q1 - t->org;
if(p1 > t->nchars)
p1 = t->nchars;
if(q0 < t->org){
t->org = q0;
p0 = 0;
}else
p0 = q0 - t->org;
frdelete(t, p0, p1);
textfill(t);
}
t->rs.r[t->rs.nr] = L'\0';
}
int
textbswidth(Text *t, Rune c)
{
uint q, eq;
Rune r;
int skipping;
/* there is known to be at least one character to erase */
if(c == Kbs) /* ^H: erase character */
return 1;
q = t->q0;
skipping = TRUE;
while(q > 0){
r = t->rs.r[q-1];
if(r == '\n'){ /* eat at most one more character */
if(q == t->q0) /* eat the newline */
--q;
break;
}
if(c == Ketb){
eq = isalnum(r);
if(eq && skipping) /* found one; stop skipping */
skipping = FALSE;
else if(!eq && !skipping)
break;
}
--q;
}
return t->q0-q;
}
void
texttype(Text *t, Rune r)
{
uint q0, q1;
int nb, n;
int nr;
Rune *rp;
if(t->what!=Textarea && r=='\n'){
if(t->what==Urltag)
get(t, t, XXX, XXX, nil, 0);
return;
}
if(t->what==Tag && (r==Kscrollonedown || r==Kscrolloneup))
return;
nr = 1;
rp = &r;
switch(r){
case Kleft:
if(t->q0 > 0)
textshow(t, t->q0-1, t->q0-1, TRUE);
return;
case Kright:
if(t->q1 < t->rs.nr)
textshow(t, t->q1+1, t->q1+1, TRUE);
return;
case Kdown:
n = t->maxlines/3;
goto case_Down;
case Kscrollonedown:
n = mousescrollsize(t->maxlines);
if(n <= 0)
n = 1;
goto case_Down;
case Kpgdown:
n = 2*t->maxlines/3;
case_Down:
q0 = t->org+frcharofpt(t, Pt(t->r.min.x, t->r.min.y+n*t->font->height));
textsetorigin(t, q0, TRUE);
return;
case Kup:
n = t->maxlines/3;
goto case_Up;
case Kscrolloneup:
n = mousescrollsize(t->maxlines);
goto case_Up;
case Kpgup:
n = 2*t->maxlines/3;
case_Up:
q0 = textbacknl(t, t->org, n);
textsetorigin(t, q0, TRUE);
return;
case Khome:
textshow(t, 0, 0, FALSE);
return;
case Kend:
textshow(t, t->rs.nr, t->rs.nr, FALSE);
return;
case Ksoh: /* ^A: beginning of line */
/* go to where ^U would erase, if not already at BOL */
nb = 0;
if(t->q0>0 && t->rs.r[t->q0-1]!='\n')
nb = textbswidth(t, Knack);
textshow(t, t->q0-nb, t->q0-nb, TRUE);
return;
case Kenq: /* ^E: end of line */
q0 = t->q0;
while(q0<t->rs.nr && t->rs.r[q0]!='\n')
q0++;
textshow(t, q0, q0, TRUE);
return;
}
if(t->q1 > t->q0)
cut(t, t, TRUE, TRUE, nil, 0);
textshow(t, t->q0, t->q0, TRUE);
switch(r){
case Kbs: /* ^H: erase character */
case Knack: /* ^U: erase line */
case Ketb: /* ^W: erase word */
if(t->q0 == 0) /* nothing to erase */
return;
nb = textbswidth(t, r);
q1 = t->q0;
q0 = q1-nb;
/* if selection is at beginning of window, avoid deleting invisible text */
if(q0 < t->org){
q0 = t->org;
nb = q1-q0;
}
if(nb > 0){
textdelete(t, q0, q0+nb);
textsetselect(t, q0, q0);
}
return;
}
/* otherwise ordinary character; just insert */
textinsert(t, t->q0, &r, 1);
if(rp != &r)
free(rp);
textsetselect(t, t->q0+nr, t->q0+nr);
if(t->what == Textarea)
textscrdraw(t);
}
static Text *clicktext;
static uint clickmsec;
static Text *selecttext;
static uint selectq;
/*
* called from frame library
*/
void
framescroll(Frame *f, int dl)
{
if(f != &selecttext->Frame)
error("frameselect not right frame");
textframescroll(selecttext, dl);
}
void
textframescroll(Text *t, int dl)
{
uint q0;
if(dl == 0){
scrsleep(100);
return;
}
if(dl < 0){
q0 = textbacknl(t, t->org, -dl);
if(selectq > t->org+t->p0)
textsetselect(t, t->org+t->p0, selectq);
else
textsetselect(t, selectq, t->org+t->p0);
}else{
if(t->org+t->nchars == t->rs.nr)
return;
q0 = t->org+frcharofpt(t, Pt(t->r.min.x, t->r.min.y+dl*t->font->height));
if(selectq > t->org+t->p1)
textsetselect(t, t->org+t->p1, selectq);
else
textsetselect(t, selectq, t->org+t->p1);
}
textsetorigin(t, q0, TRUE);
}
void
textselect(Text *t)
{
uint q0, q1;
int b, x, y;
int state;
selecttext = t;
/*
* To have double-clicking and chording, we double-click
* immediately if it might make sense.
*/
b = mouse->buttons;
q0 = t->q0;
q1 = t->q1;
selectq = t->org+frcharofpt(t, mouse->xy);
if(clicktext==t && mouse->msec-clickmsec<500)
if(q0==q1 && selectq==q0){
textdoubleclick(t, &q0, &q1);
textsetselect(t, q0, q1);
flushimage(display, 1);
x = mouse->xy.x;
y = mouse->xy.y;
/* stay here until something interesting happens */
do
readmouse(mousectl);
while(mouse->buttons==b && abs(mouse->xy.x-x)<3 && abs(mouse->xy.y-y)<3);
mouse->xy.x = x; /* in case we're calling frselect */
mouse->xy.y = y;
q0 = t->q0; /* may have changed */
q1 = t->q1;
selectq = q0;
}
if(mouse->buttons == b){
t->Frame.scroll = framescroll;
frselect(t, mousectl);
/* horrible botch: while asleep, may have lost selection altogether */
if(selectq > t->rs.nr)
selectq = t->org + t->p0;
t->Frame.scroll = nil;
if(selectq < t->org)
q0 = selectq;
else
q0 = t->org + t->p0;
if(selectq > t->org+t->nchars)
q1 = selectq;
else
q1 = t->org+t->p1;
}
if(q0 == q1){
if(q0==t->q0 && clicktext==t && mouse->msec-clickmsec<500){
textdoubleclick(t, &q0, &q1);
clicktext = nil;
}else{
clicktext = t;
clickmsec = mouse->msec;
}
}else
clicktext = nil;
textsetselect(t, q0, q1);
flushimage(display, 1);
state = 0; /* undo when possible; +1 for cut, -1 for paste */
while(mouse->buttons){
mouse->msec = 0;
b = mouse->buttons;
if((b&1) && (b&6)){
if(b & 2){
if(state==-1 && t->what==Textarea){
textsetselect(t, q0, t->q0);
state = 0;
}else if(state != 1){
cut(t, t, TRUE, TRUE, nil, 0);
state = 1;
}
}else{
if(state==1 && t->what==Textarea){
textsetselect(t, q0, t->q1);
state = 0;
}else if(state != -1){
paste(t, t, TRUE, FALSE, nil, 0);
state = -1;
}
}
textscrdraw(t);
}
flushimage(display, 1);
while(mouse->buttons == b)
readmouse(mousectl);
clicktext = nil;
}
}
void
textshow(Text *t, uint q0, uint q1, int doselect)
{
int qe;
int nl;
uint q;
if(t->what != Textarea){
if(doselect)
textsetselect(t, q0, q1);
return;
}
if(doselect)
textsetselect(t, q0, q1);
qe = t->org+t->nchars;
if(t->org<=q0 && (q0<qe || (q0==qe && qe==t->rs.nr)))
textscrdraw(t);
else{
nl = t->maxlines/4;
q = textbacknl(t, q0, nl);
/* avoid going backwards if trying to go forwards - long lines! */
if(!(q0>t->org && q<t->org))
textsetorigin(t, q, TRUE);
while(q0 > t->org+t->nchars)
textsetorigin(t, t->org+1, FALSE);
}
}
static
int
region(int a, int b)
{
if(a < b)
return -1;
if(a == b)
return 0;
return 1;
}
void
selrestore(Frame *f, Point pt0, uint p0, uint p1)
{
if(p1<=f->p0 || p0>=f->p1){
/* no overlap */
frdrawsel0(f, pt0, p0, p1, f->cols[BACK], f->cols[TEXT]);
return;
}
if(p0>=f->p0 && p1<=f->p1){
/* entirely inside */
frdrawsel0(f, pt0, p0, p1, f->cols[HIGH], f->cols[HTEXT]);
return;
}
/* they now are known to overlap */
/* before selection */
if(p0 < f->p0){
frdrawsel0(f, pt0, p0, f->p0, f->cols[BACK], f->cols[TEXT]);
p0 = f->p0;
pt0 = frptofchar(f, p0);
}
/* after selection */
if(p1 > f->p1){
frdrawsel0(f, frptofchar(f, f->p1), f->p1, p1, f->cols[BACK], f->cols[TEXT]);
p1 = f->p1;
}
/* inside selection */
frdrawsel0(f, pt0, p0, p1, f->cols[HIGH], f->cols[HTEXT]);
}
void
textsetselect(Text *t, uint q0, uint q1)
{
int p0, p1;
/* t->p0 and t->p1 are always right; t->q0 and t->q1 may be off */
t->q0 = q0;
t->q1 = q1;
/* compute desired p0,p1 from q0,q1 */
p0 = q0-t->org;
p1 = q1-t->org;
if(p0 < 0)
p0 = 0;
if(p1 < 0)
p1 = 0;
if(p0 > t->nchars)
p0 = t->nchars;
if(p1 > t->nchars)
p1 = t->nchars;
if(p0==t->p0 && p1==t->p1)
return;
/* screen disagrees with desired selection */
if(t->p1<=p0 || p1<=t->p0 || p0==p1 || t->p1==t->p0){
/* no overlap or too easy to bother trying */
frdrawsel(t, frptofchar(t, t->p0), t->p0, t->p1, 0);
frdrawsel(t, frptofchar(t, p0), p0, p1, 1);
goto Return;
}
/* overlap; avoid unnecessary painting */
if(p0 < t->p0){
/* extend selection backwards */
frdrawsel(t, frptofchar(t, p0), p0, t->p0, 1);
}else if(p0 > t->p0){
/* trim first part of selection */
frdrawsel(t, frptofchar(t, t->p0), t->p0, p0, 0);
}
if(p1 > t->p1){
/* extend selection forwards */
frdrawsel(t, frptofchar(t, t->p1), t->p1, p1, 1);
}else if(p1 < t->p1){
/* trim last part of selection */
frdrawsel(t, frptofchar(t, p1), p1, t->p1, 0);
}
Return:
t->p0 = p0;
t->p1 = p1;
}
/*
* Release the button in less than DELAY ms and it's considered a null selection
* if the mouse hardly moved, regardless of whether it crossed a char boundary.
*/
enum {
DELAY = 2,
MINMOVE = 4,
};
uint
xselect(Frame *f, Mousectl *mc, Image *col, uint *p1p) /* when called, button is down */
{
uint p0, p1, q, tmp;
ulong msec;
Point mp, pt0, pt1, qt;
int reg, b;
mp = mc->xy;
b = mc->buttons;
msec = mc->msec;
/* remove tick */
if(f->p0 == f->p1)
frtick(f, frptofchar(f, f->p0), 0);
p0 = p1 = frcharofpt(f, mp);
pt0 = frptofchar(f, p0);
pt1 = frptofchar(f, p1);
reg = 0;
frtick(f, pt0, 1);
do{
q = frcharofpt(f, mc->xy);
if(p1 != q){
if(p0 == p1)
frtick(f, pt0, 0);
if(reg != region(q, p0)){ /* crossed starting point; reset */
if(reg > 0)
selrestore(f, pt0, p0, p1);
else if(reg < 0)
selrestore(f, pt1, p1, p0);
p1 = p0;
pt1 = pt0;
reg = region(q, p0);
if(reg == 0)
frdrawsel0(f, pt0, p0, p1, col, display->white);
}
qt = frptofchar(f, q);
if(reg > 0){
if(q > p1)
frdrawsel0(f, pt1, p1, q, col, display->white);
else if(q < p1)
selrestore(f, qt, q, p1);
}else if(reg < 0){
if(q > p1)
selrestore(f, pt1, p1, q);
else
frdrawsel0(f, qt, q, p1, col, display->white);
}
p1 = q;
pt1 = qt;
}
if(p0 == p1)
frtick(f, pt0, 1);
flushimage(f->display, 1);
readmouse(mc);
}while(mc->buttons == b);
if(mc->msec-msec < DELAY && p0!=p1
&& abs(mp.x-mc->xy.x)<MINMOVE
&& abs(mp.y-mc->xy.y)<MINMOVE) {
if(reg > 0)
selrestore(f, pt0, p0, p1);
else if(reg < 0)
selrestore(f, pt1, p1, p0);
p1 = p0;
}
if(p1 < p0){
tmp = p0;
p0 = p1;
p1 = tmp;
}
pt0 = frptofchar(f, p0);
if(p0 == p1)
frtick(f, pt0, 0);
selrestore(f, pt0, p0, p1);
/* restore tick */
if(f->p0 == f->p1)
frtick(f, frptofchar(f, f->p0), 1);
flushimage(f->display, 1);
*p1p = p1;
return p0;
}
int
textselect23(Text *t, uint *q0, uint *q1, Image *high, int mask)
{
uint p0, p1;
int buts;
p0 = xselect(t, mousectl, high, &p1);
buts = mousectl->buttons;
if((buts & mask) == 0){
*q0 = p0+t->org;
*q1 = p1+t->org;
}
while(mousectl->buttons)
readmouse(mousectl);
return buts;
}
int
textselect2(Text *t, uint *q0, uint *q1, Text **tp)
{
int buts;
*tp = nil;
buts = textselect23(t, q0, q1, but2col, 4);
if(buts & 4)
return 0;
if(buts & 1){ /* pick up argument */
*tp = argtext;
return 1;
}
return 1;
}
int
textselect3(Text *t, uint *q0, uint *q1)
{
int h;
h = (textselect23(t, q0, q1, but3col, 1|2) == 0);
return h;
}
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
};
void
textdoubleclick(Text *t, uint *q0, uint *q1)
{
int c, i;
Rune *r, *l, *p;
uint q;
if(t->rs.nr == 0)
return;
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 = t->rs.r[q-1];
p = runestrchr(l, c);
if(p != nil){
if(textclickmatch(t, c, t->rs.r[p-l], 1, &q))
*q1 = q-(c!='\n');
return;
}
/* try matching character to right, looking left */
if(q == t->rs.nr)
c = '\n';
else
c = t->rs.r[q];
p = runestrchr(r, c);
if(p != nil){
if(textclickmatch(t, c, l[p-r], -1, &q)){
*q1 = *q0+(*q0<t->rs.nr && c=='\n');
*q0 = q;
if(c!='\n' || q!=0 || t->rs.r[0]=='\n')
(*q0)++;
}
return;
}
}
/* try filling out word to right */
while(*q1<t->rs.nr && isalnum(t->rs.r[*q1]))
(*q1)++;
/* try filling out word to left */
while(*q0>0 && isalnum(t->rs.r[*q0-1]))
(*q0)--;
}
int
textclickmatch(Text *t, int cl, int cr, int dir, uint *q)
{
Rune c;
int nest;
nest = 1;
for(;;){
if(dir > 0){
if(*q == t->rs.nr)
break;
c = t->rs.r[*q];
(*q)++;
}else{
if(*q == 0)
break;
(*q)--;
c = t->rs.r[*q];
}
if(c == cr){
if(--nest==0)
return 1;
}else if(c == cl)
nest++;
}
return cl=='\n' && nest==1;
}
uint
textbacknl(Text *t, uint p, uint n)
{
int i, j;
/* look for start of this line if n==0 */
if(n==0 && p>0 && t->rs.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(t->rs.r[p-1]=='\n')
break;
}
return p;
}
void
textsetorigin(Text *t, 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<t->rs.nr; i++){
if(t->rs.r[org] == '\n'){
org++;
break;
}
org++;
}
}
a = org-t->org;
fixup = 0;
if(a>=0 && a<t->nchars){
frdelete(t, 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<t->nchars){
n = t->org - org;
r = runemalloc(n);
runemove(r, t->rs.r+org, n);
frinsert(t, r, r+n, 0);
free(r);
}else
frdelete(t, 0, t->nchars);
t->org = org;
textfill(t);
textscrdraw(t);
textsetselect(t, t->q0, t->q1);
if(fixup && t->p1 > t->p0)
frdrawsel(t, frptofchar(t, t->p1-1), t->p1-1, t->p1, 1);
}
void
textset(Text *t, Rune*r, int n)
{
textdelete(t, 0, t->rs.nr);
textinsert(t, 0, r, n);
textsetselect(t, t->q0, t->q1);
}
void
textmouse(Text *t, Point xy, int but)
{
Text *argt;
uint q0, q1;
if(ptinrect(xy, t->scrollr)){
if(t->what == Columntag)
rowdragcol(&row, t->col, but);
else if(t->what == Tag)
coldragwin(t->col, t->w, but);
else if(t->what == Textarea)
textscroll(t, but);
if(t->col)
activecol = t->col;
return;
}
if(but == 1){
selpage = nil;
textselect(t);
argtext = t;
seltext = t;
}else if(but == 2){
if(textselect2(t, &q0, &q1, &argt))
execute(t, q0, q1, argt);
}else if(but == 3){
if(textselect3(t, &q0, &q1))
look3(t, q0, q1);
}
}