position.go

@@ -10,7 +10,7 @@ func (p *Position) Advance(rn rune) {
 	p.Index++
 	if rn == '\n' {
 		p.Line++
-		p.Column = 1
+		p.Column = 0
 	} else {
 		p.Column++
 	}

reader.go

@@ -18,7 +18,7 @@ func New(r io.Reader) *Reader {
 	return &Reader{
 		buf: ds.NewArrayStack[posRune](),
 		src: bufio.NewReader(r),
-		pos: &Position{Index: 0, Line: 1, Column: 1},
+		pos: &Position{Index: 0, Line: 1, Column: 0},
 	}
 }
 
@@ -33,8 +33,8 @@ func (r *Reader) psrn(rn rune) posRune {
 	}
 }
 
-func (r *Reader) Pos() Position {
-	return *r.pos
+func (r *Reader) Pos() (index, line, column int) {
+	return r.pos.Index, r.pos.Line, r.pos.Column
 }
 
 // Rune returns the next rune in r

reader_test.go

@@ -11,8 +11,8 @@ func TestPos(t *testing.T) {
 
 	unread := false
 	for rn, err := r.Rune(); err == nil; rn, err = r.Rune() {
-		pos := r.Pos()
-		fmt.Println(string(rn), pos.Index, pos.Line, pos.Column)
+		index, line, col := r.Pos()
+		fmt.Println(string(rn), index, line, col)
 
 		if !unread && rn == '\n' {
 			for i := 0; i < 5; i++ {