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/* Copyright (c) 1992 AT&T - All rights reserved. */
#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 oldp0;
if(p0 > f->nrunes)
p0 = f->nrunes;
oldp0 = p0;
Fgetcset(f, p0);
for(nl=nc=c=0; c!=-1 && nl<ls && nc<ls*CHARSHIFT; nc++)
if((c=Fbgetc(f)) == '\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
alnum(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
clickmatch(File *f, int cl, int cr, int dir)
{
int c;
int nest = 1;
while((c=(dir>0? Fgetc(f) : Fbgetc(f))) > 0)
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;
}
void
doubleclick(File *f, Posn p1)
{
int c, i;
Rune *r, *l;
if(p1 > f->nrunes)
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 */
if(p1 == 0){
Fgetcset(f, p1);
c = '\n';
}else{
Fgetcset(f, p1-1);
c = Fgetc(f);
}
if(c!=-1 && strrune(l, c)){
if(clickmatch(f, c, r[strrune(l, c)-l], 1)){
f->dot.r.p1 = p1;
f->dot.r.p2 = f->getcp-(c!='\n');
}
return;
}
/* try right match */
if(p1 == f->nrunes){
Fbgetcset(f, p1);
c = '\n';
}else{
Fbgetcset(f, p1+1);
c = Fbgetc(f);
}
if(c!=-1 && strrune(r, c)){
if(clickmatch(f, c, l[strrune(r, c)-r], -1)){
f->dot.r.p1 = f->getcp;
if(c!='\n' || f->getcp!=0 ||
(Fgetcset(f, (Posn)0),Fgetc(f))=='\n')
f->dot.r.p1++;
f->dot.r.p2 = p1+(p1<f->nrunes && c=='\n');
}
return;
}
}
/* try filling out word to right */
Fgetcset(f, p1);
while((c=Fgetc(f))!=-1 && alnum(c))
f->dot.r.p2++;
/* try filling out word to left */
Fbgetcset(f, p1);
while((c=Fbgetc(f))!=-1 && alnum(c))
f->dot.r.p1--;
}
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