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-rw-r--r--src/libframe/frinsert.c285
1 files changed, 285 insertions, 0 deletions
diff --git a/src/libframe/frinsert.c b/src/libframe/frinsert.c
new file mode 100644
index 00000000..8ca39fcf
--- /dev/null
+++ b/src/libframe/frinsert.c
@@ -0,0 +1,285 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <mouse.h>
+#include <frame.h>
+
+#define DELTA 25
+#define TMPSIZE 256
+static Frame frame;
+
+static
+Point
+bxscan(Frame *f, Rune *sp, Rune *ep, Point *ppt)
+{
+ int w, c, nb, delta, nl, nr, rw;
+ Frbox *b;
+ char *s, tmp[TMPSIZE+3]; /* +3 for rune overflow */
+ uchar *p;
+
+ frame.r = f->r;
+ frame.b = f->b;
+ frame.font = f->font;
+ frame.maxtab = f->maxtab;
+ frame.nbox = 0;
+ frame.nchars = 0;
+ memmove(frame.cols, f->cols, sizeof frame.cols);
+ delta = DELTA;
+ nl = 0;
+ for(nb=0; sp<ep && nl<=f->maxlines; nb++,frame.nbox++){
+ if(nb == frame.nalloc){
+ _frgrowbox(&frame, delta);
+ if(delta < 10000)
+ delta *= 2;
+ }
+ b = &frame.box[nb];
+ c = *sp;
+ if(c=='\t' || c=='\n'){
+ b->bc = c;
+ b->wid = 5000;
+ b->minwid = (c=='\n')? 0 : stringwidth(frame.font, " ");
+ b->nrune = -1;
+ if(c=='\n')
+ nl++;
+ frame.nchars++;
+ sp++;
+ }else{
+ s = tmp;
+ nr = 0;
+ w = 0;
+ while(sp < ep){
+ c = *sp;
+ if(c=='\t' || c=='\n')
+ break;
+ rw = runetochar(s, sp);
+ if(s+rw >= tmp+TMPSIZE)
+ break;
+ w += runestringnwidth(frame.font, sp, 1);
+ sp++;
+ s += rw;
+ nr++;
+ }
+ *s++ = 0;
+ p = _frallocstr(f, s-tmp);
+ b = &frame.box[nb];
+ b->ptr = p;
+ memmove(p, tmp, s-tmp);
+ b->wid = w;
+ b->nrune = nr;
+ frame.nchars += nr;
+ }
+ }
+ _frcklinewrap0(f, ppt, &frame.box[0]);
+ return _frdraw(&frame, *ppt);
+}
+
+static
+void
+chopframe(Frame *f, Point pt, ulong p, int bn)
+{
+ Frbox *b;
+
+ for(b = &f->box[bn]; ; b++){
+ if(b >= &f->box[f->nbox])
+ drawerror(f->display, "endofframe");
+ _frcklinewrap(f, &pt, b);
+ if(pt.y >= f->r.max.y)
+ break;
+ p += NRUNE(b);
+ _fradvance(f, &pt, b);
+ }
+ f->nchars = p;
+ f->nlines = f->maxlines;
+ if(b<&f->box[f->nbox]) /* BUG */
+ _frdelbox(f, (int)(b-f->box), f->nbox-1);
+}
+
+void
+frinsert(Frame *f, Rune *sp, Rune *ep, ulong p0)
+{
+ Point pt0, pt1, opt0, ppt0, ppt1, pt;
+ Frbox *b;
+ int n, n0, nn0, y;
+ ulong cn0;
+ Image *col;
+ Rectangle r;
+ static struct{
+ Point pt0, pt1;
+ }*pts;
+ static int nalloc=0;
+ int npts;
+
+ if(p0>f->nchars || sp==ep || f->b==nil)
+ return;
+ n0 = _frfindbox(f, 0, 0, p0);
+ cn0 = p0;
+ nn0 = n0;
+ pt0 = _frptofcharnb(f, p0, n0);
+ ppt0 = pt0;
+ opt0 = pt0;
+ pt1 = bxscan(f, sp, ep, &ppt0);
+ ppt1 = pt1;
+ if(n0 < f->nbox){
+ _frcklinewrap(f, &pt0, b = &f->box[n0]); /* for frdrawsel() */
+ _frcklinewrap0(f, &ppt1, b);
+ }
+ f->modified = 1;
+ /*
+ * ppt0 and ppt1 are start and end of insertion as they will appear when
+ * insertion is complete. pt0 is current location of insertion position
+ * (p0); pt1 is terminal point (without line wrap) of insertion.
+ */
+ if(f->p0 == f->p1)
+ frtick(f, frptofchar(f, f->p0), 0);
+
+ /*
+ * Find point where old and new x's line up
+ * Invariants:
+ * pt0 is where the next box (b, n0) is now
+ * pt1 is where it will be after the insertion
+ * If pt1 goes off the rectangle, we can toss everything from there on
+ */
+ for(b = &f->box[n0],npts=0;
+ pt1.x!=pt0.x && pt1.y!=f->r.max.y && n0<f->nbox; b++,n0++,npts++){
+ _frcklinewrap(f, &pt0, b);
+ _frcklinewrap0(f, &pt1, b);
+ if(b->nrune > 0){
+ n = _frcanfit(f, pt1, b);
+ if(n == 0)
+ drawerror(f->display, "_frcanfit==0");
+ if(n != b->nrune){
+ _frsplitbox(f, n0, n);
+ b = &f->box[n0];
+ }
+ }
+ if(npts == nalloc){
+ pts = realloc(pts, (npts+DELTA)*sizeof(pts[0]));
+ nalloc += DELTA;
+ b = &f->box[n0];
+ }
+ pts[npts].pt0 = pt0;
+ pts[npts].pt1 = pt1;
+ /* has a text box overflowed off the frame? */
+ if(pt1.y == f->r.max.y)
+ break;
+ _fradvance(f, &pt0, b);
+ pt1.x += _frnewwid(f, pt1, b);
+ cn0 += NRUNE(b);
+ }
+ if(pt1.y > f->r.max.y)
+ drawerror(f->display, "frinsert pt1 too far");
+ if(pt1.y==f->r.max.y && n0<f->nbox){
+ f->nchars -= _frstrlen(f, n0);
+ _frdelbox(f, n0, f->nbox-1);
+ }
+ if(n0 == f->nbox)
+ f->nlines = (pt1.y-f->r.min.y)/f->font->height+(pt1.x>f->r.min.x);
+ else if(pt1.y!=pt0.y){
+ int q0, q1;
+
+ y = f->r.max.y;
+ q0 = pt0.y+f->font->height;
+ q1 = pt1.y+f->font->height;
+ f->nlines += (q1-q0)/f->font->height;
+ if(f->nlines > f->maxlines)
+ chopframe(f, ppt1, p0, nn0);
+ if(pt1.y < y){
+ r = f->r;
+ r.min.y = q1;
+ r.max.y = y;
+ if(q1 < y)
+ draw(f->b, r, f->b, nil, Pt(f->r.min.x, q0));
+ r.min = pt1;
+ r.max.x = pt1.x+(f->r.max.x-pt0.x);
+ r.max.y = q1;
+ draw(f->b, r, f->b, nil, pt0);
+ }
+ }
+ /*
+ * Move the old stuff down to make room. The loop will move the stuff
+ * between the insertion and the point where the x's lined up.
+ * The draw()s above moved everything down after the point they lined up.
+ */
+ for((y=pt1.y==f->r.max.y?pt1.y:0),b = &f->box[n0-1]; --npts>=0; --b){
+ pt = pts[npts].pt1;
+ if(b->nrune > 0){
+ r.min = pt;
+ r.max = r.min;
+ r.max.x += b->wid;
+ r.max.y += f->font->height;
+ draw(f->b, r, f->b, nil, pts[npts].pt0);
+ /* clear bit hanging off right */
+ if(npts==0 && pt.y>pt0.y){
+ /*
+ * first new char is bigger than first char we're
+ * displacing, causing line wrap. ugly special case.
+ */
+ r.min = opt0;
+ r.max = opt0;
+ r.max.x = f->r.max.x;
+ r.max.y += f->font->height;
+ if(f->p0<=cn0 && cn0<f->p1) /* b+1 is inside selection */
+ col = f->cols[HIGH];
+ else
+ col = f->cols[BACK];
+ draw(f->b, r, col, nil, r.min);
+ }else if(pt.y < y){
+ r.min = pt;
+ r.max = pt;
+ r.min.x += b->wid;
+ r.max.x = f->r.max.x;
+ r.max.y += f->font->height;
+ if(f->p0<=cn0 && cn0<f->p1) /* b+1 is inside selection */
+ col = f->cols[HIGH];
+ else
+ col = f->cols[BACK];
+ draw(f->b, r, col, nil, r.min);
+ }
+ y = pt.y;
+ cn0 -= b->nrune;
+ }else{
+ r.min = pt;
+ r.max = pt;
+ r.max.x += b->wid;
+ r.max.y += f->font->height;
+ if(r.max.x >= f->r.max.x)
+ r.max.x = f->r.max.x;
+ cn0--;
+ if(f->p0<=cn0 && cn0<f->p1) /* b is inside selection */
+ col = f->cols[HIGH];
+ else
+ col = f->cols[BACK];
+ draw(f->b, r, col, nil, r.min);
+ y = 0;
+ if(pt.x == f->r.min.x)
+ y = pt.y;
+ }
+ }
+ /* insertion can extend the selection, so the condition here is different */
+ if(f->p0<p0 && p0<=f->p1)
+ col = f->cols[HIGH];
+ else
+ col = f->cols[BACK];
+ frselectpaint(f, ppt0, ppt1, col);
+ _frredraw(&frame, ppt0);
+ _fraddbox(f, nn0, frame.nbox);
+ for(n=0; n<frame.nbox; n++)
+ f->box[nn0+n] = frame.box[n];
+ if(nn0>0 && f->box[nn0-1].nrune>=0 && ppt0.x-f->box[nn0-1].wid>=f->r.min.x){
+ --nn0;
+ ppt0.x -= f->box[nn0].wid;
+ }
+ n0 += frame.nbox;
+ _frclean(f, ppt0, nn0, n0<f->nbox-1? n0+1 : n0);
+ f->nchars += frame.nchars;
+ if(f->p0 >= p0)
+ f->p0 += frame.nchars;
+ if(f->p0 > f->nchars)
+ f->p0 = f->nchars;
+ if(f->p1 >= p0)
+ f->p1 += frame.nchars;
+ if(f->p1 > f->nchars)
+ f->p1 = f->nchars;
+ if(f->p0 == f->p1)
+ frtick(f, frptofchar(f, f->p0), 1);
+}
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