Initial revision

src/cmd/sam/moveto.c

@@ -0,0 +1,173 @@
+#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
+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, 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;
+}
+
+void
+doubleclick(File *f, Posn p1)
+{
+	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 && alnum(filereadc(f, p++)))
+		f->dot.r.p2++;
+	/* try filling out word to left */
+	p = p1;
+	while(--p >= 0 && alnum(filereadc(f, p)))
+		f->dot.r.p1--;
+}
+