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#include "sam.h"
void
moveto(File *f, Range r)
{
Posn p1 = r.p1, p2 = r.p2;
f->dot.r.p1 = p1;
f->dot.r.p2 = p2;
if(f->rasp){
telldot(f);
outTsl(Hmoveto, f->tag, f->dot.r.p1);
}
}
void
telldot(File *f)
{
if(f->rasp == 0)
panic("telldot");
if(f->dot.r.p1==f->tdot.p1 && f->dot.r.p2==f->tdot.p2)
return;
outTsll(Hsetdot, f->tag, f->dot.r.p1, f->dot.r.p2);
f->tdot = f->dot.r;
}
void
tellpat(void)
{
outTS(Hsetpat, &lastpat);
patset = FALSE;
}
#define CHARSHIFT 128
void
lookorigin(File *f, Posn p0, Posn ls)
{
int nl, nc, c;
Posn p, oldp0;
if(p0 > f->nc)
p0 = f->nc;
oldp0 = p0;
p = p0;
for(nl=nc=c=0; c!=-1 && nl<ls && nc<ls*CHARSHIFT; nc++)
if((c=filereadc(f, --p)) == '\n'){
nl++;
oldp0 = p0-nc;
}
if(c == -1)
p0 = 0;
else if(nl==0){
if(p0>=CHARSHIFT/2)
p0-=CHARSHIFT/2;
else
p0 = 0;
}else
p0 = oldp0;
outTsl(Horigin, f->tag, p0);
}
int
isalnum(int c)
{
/*
* Hard to get absolutely right. Use what we know about ASCII
* and assume anything above the Latin control characters is
* potentially an alphanumeric.
*/
if(c<=' ')
return 0;
if(0x7F<=c && c<=0xA0)
return 0;
if(utfrune("!\"#$%&'()*+,-./:;<=>?@[\\]^`{|}~", c))
return 0;
return 1;
}
int
isspace(Rune c)
{
return c == 0 || c == ' ' || c == '\t' ||
c == '\n' || c == '\r' || c == '\v';
}
int
inmode(Rune r, int mode)
{
return (mode == 0) ? isalnum(r) : r && !isspace(r);
}
int
clickmatch(File *f, int cl, int cr, int dir, Posn *p)
{
int c;
int nest = 1;
for(;;){
if(dir > 0){
if(*p >= f->nc)
break;
c = filereadc(f, (*p)++);
}else{
if(*p == 0)
break;
c = filereadc(f, --(*p));
}
if(c == cr){
if(--nest==0)
return 1;
}else if(c == cl)
nest++;
}
return cl=='\n' && nest==1;
}
Rune*
strrune(Rune *s, Rune c)
{
Rune c1;
if(c == 0) {
while(*s++)
;
return s-1;
}
while(c1 = *s++)
if(c1 == c)
return s-1;
return 0;
}
/*
* Stretches a selection out over current text,
* selecting matching range if possible.
* If there's no matching range, mode 0 selects
* a single alphanumeric region. Mode 1 selects
* a non-whitespace region.
*/
void
stretchsel(File *f, Posn p1, int mode)
{
int c, i;
Rune *r, *l;
Posn p;
if(p1 > f->nc)
return;
f->dot.r.p1 = f->dot.r.p2 = p1;
for(i=0; left[i]; i++){
l = left[i];
r = right[i];
/* try left match */
p = p1;
if(p1 == 0)
c = '\n';
else
c = filereadc(f, p - 1);
if(strrune(l, c)){
if(clickmatch(f, c, r[strrune(l, c)-l], 1, &p)){
f->dot.r.p1 = p1;
f->dot.r.p2 = p-(c!='\n');
}
return;
}
/* try right match */
p = p1;
if(p1 == f->nc)
c = '\n';
else
c = filereadc(f, p);
if(strrune(r, c)){
if(clickmatch(f, c, l[strrune(r, c)-r], -1, &p)){
f->dot.r.p1 = p;
if(c!='\n' || p!=0 || filereadc(f, 0)=='\n')
f->dot.r.p1++;
f->dot.r.p2 = p1+(p1<f->nc && c=='\n');
}
return;
}
}
/* try filling out word to right */
p = p1;
while(p < f->nc && inmode(filereadc(f, p++), mode))
f->dot.r.p2++;
/* try filling out word to left */
p = p1;
while(--p >= 0 && inmode(filereadc(f, p), mode))
f->dot.r.p1--;
}
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