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#include "wily.h"
#include "text.h"
#include <ctype.h>
/* Matching brackets for double-click
*/
static Rune l1[] = { '{', '[', '(', '<', 0253, 0};
static Rune r1[] = {'}', ']', ')', '>', 0273, 0};
static Rune l2[] = { '\n', 0};
static Rune r2[] = {'\n', 0};
static Rune l3[] = { '\'', '"', '`', '>', 0};
static Rune r3[] = {'\'', '"', '`', '<', 0};
Rune *left[]= { l1, l2, l3, 0};
Rune *right[]= { r1, r2, r3, 0};
/* Return false if 'c' is obviously not an alphanumeric character,
* or if it is in the stoplist.
*/
static Bool
okchar(int c, char *stoplist) {
/*
* 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 false;
if(0x7F<=c && c<=0xA0)
return false;
if(utfrune(stoplist, c))
return false;
return 1;
}
static int
clickmatch(Text *t, int cl, int cr, int dir) {
int c, nest;
nest=1;
while((c=(dir>0? Tgetc(t) : Tbgetc(t))) > 0) {
if(cl=='\n' && c==0x04) /* EOT is trouble */
return 1;
if(c == cr){
if(--nest == 0)
return 1;
}else if(c == cl)
nest++;
}
return cl=='\n' && nest==1;
}
static 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;
}
/* Expand the selection (pp0-pp1) left and right, stopping
* at characters that aren't alphanumeric or are in the stop list 's'
*/
Range
text_expand(Text *t, Range r, char *s) {
int c;
Tgetcset(t, r.p1);
while( (c = Tgetc(t)) !=-1 && okchar(c,s))
r.p1++;
Tbgetcset(t, r.p0);
while((c = Tbgetc(t)) != -1 && okchar(c,s))
r.p0--;
return r;
}
/*
* Expand a doubleclick at p0, return the resulting range.
*/
Range
text_doubleclick(Text *t, ulong p0) {
int c, i;
Rune *r, *l;
Range dot;
if(p0 > t->length)
return dot;
dot.p0 = dot.p1 = p0;
for(i=0; left[i]; i++){
l = left[i];
r = right[i];
/* try left match */
if(p0 == 0){
Tgetcset(t, p0);
c = '\n';
}else{
Tgetcset(t, p0-1);
c = Tgetc(t);
}
if(c!=-1 && strrune(l, c)){
if(clickmatch(t, c, r[strrune(l, c)-l], 1)){
dot.p0 = p0;
dot.p1 = t->pos-(c!='\n');
}
return dot;
}
/* try right match */
if(p0 == t->length){
Tbgetcset(t, p0);
c = '\n';
}else{
Tbgetcset(t, p0+1);
c = Tbgetc(t);
}
if(c !=-1 && strrune(r, c)){
if(clickmatch(t, c, l[strrune(r, c)-r], -1)){
dot.p0 = t->pos;
if(c!='\n' || t->pos!=0 ||
(Tgetcset(t, 0),Tgetc(t))=='\n')
dot.p0++;
dot.p1 = p0+(p0<t->length && c=='\n');
}
return dot;
}
}
/* try filling out word to right */
Tgetcset(t, p0);
while((c=Tgetc(t))!=-1 && okchar(c, notdoubleclick))
dot.p1++;
/* try filling out word to left */
Tbgetcset(t, p0);
while((c=Tbgetc(t))!=-1 && okchar(c, notdoubleclick))
dot.p0--;
return dot;
}
/*
* Find start of word, going back from p0.
*/
ulong
text_startofword(Text *t, ulong p0) {
int c;
Tbgetcset(t, p0);
/* skip over special chars then skip until special char */
while ( (c=Tbgetc(t))!=-1 && c != '\n' && !okchar(c, notdoubleclick) )
;
if(c=='\n' && (t->pos != p0-1))
return t->pos + 1;
while ( (c=Tbgetc(t))!=-1 && okchar(c, notdoubleclick) )
;
return t->pos + (c!=-1);
}
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