add vendor data

vendor/github.com/dunglas/httpsfv/innerlist.go

@@ -0,0 +1,91 @@
+package httpsfv
+
+import (
+	"errors"
+	"strings"
+)
+
+// ErrInvalidInnerListFormat is returned when an inner list format is invalid.
+var ErrInvalidInnerListFormat = errors.New("invalid inner list format")
+
+// InnerList represents an inner list as defined in
+// https://httpwg.org/specs/rfc9651.html#inner-list.
+type InnerList struct {
+	Items  []Item
+	Params *Params
+}
+
+func (il InnerList) member() {
+}
+
+// marshalSFV serializes as defined in
+// https://httpwg.org/specs/rfc9651.html#ser-innerlist.
+func (il InnerList) marshalSFV(b *strings.Builder) error {
+	if err := b.WriteByte('('); err != nil {
+		return err
+	}
+
+	l := len(il.Items)
+	for i := 0; i < l; i++ {
+		if err := il.Items[i].marshalSFV(b); err != nil {
+			return err
+		}
+
+		if i != l-1 {
+			if err := b.WriteByte(' '); err != nil {
+				return err
+			}
+		}
+	}
+
+	if err := b.WriteByte(')'); err != nil {
+		return err
+	}
+
+	return il.Params.marshalSFV(b)
+}
+
+// parseInnerList parses as defined in
+// https://httpwg.org/specs/rfc9651.html#parse-item-or-list.
+func parseInnerList(s *scanner) (InnerList, error) {
+	if s.eof() || s.data[s.off] != '(' {
+		return InnerList{}, &UnmarshalError{s.off, ErrInvalidInnerListFormat}
+	}
+	s.off++
+
+	il := InnerList{nil, nil}
+
+	for !s.eof() {
+		s.scanWhileSp()
+
+		if s.eof() {
+			return InnerList{}, &UnmarshalError{s.off, ErrInvalidInnerListFormat}
+		}
+
+		if s.data[s.off] == ')' {
+			s.off++
+
+			p, err := parseParams(s)
+			if err != nil {
+				return InnerList{}, err
+			}
+
+			il.Params = p
+
+			return il, nil
+		}
+
+		i, err := parseItem(s)
+		if err != nil {
+			return InnerList{}, err
+		}
+
+		if s.eof() || (s.data[s.off] != ')' && s.data[s.off] != ' ') {
+			return InnerList{}, &UnmarshalError{s.off, ErrInvalidInnerListFormat}
+		}
+
+		il.Items = append(il.Items, i)
+	}
+
+	return InnerList{}, &UnmarshalError{s.off, ErrInvalidInnerListFormat}
+}