add vendor data

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

@@ -0,0 +1,115 @@
+package httpsfv
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"strings"
+	"time"
+)
+
+// ErrInvalidBareItem is returned when a bare item is invalid.
+var ErrInvalidBareItem = errors.New(
+	"invalid bare item type (allowed types are bool, string, int64, float64, []byte, time.Time and Token)",
+)
+
+// assertBareItem asserts that v is a valid bare item
+// according to https://httpwg.org/specs/rfc9651.html#item.
+//
+// v can be either:
+//
+// * an integer (Section 3.3.1.)
+// * a decimal (Section 3.3.2.)
+// * a string (Section 3.3.3.)
+// * a token (Section 3.3.4.)
+// * a byte sequence (Section 3.3.5.)
+// * a boolean (Section 3.3.6.)
+// * a date (Section 3.3.7.)
+// * a display string (Section 3.3.8.)
+func assertBareItem(v interface{}) {
+	switch v.(type) {
+	case bool,
+		string,
+		int,
+		int8,
+		int16,
+		int32,
+		int64,
+		uint,
+		uint8,
+		uint16,
+		uint32,
+		uint64,
+		float32,
+		float64,
+		[]byte,
+		time.Time,
+		Token,
+		DisplayString:
+		return
+	default:
+		panic(fmt.Errorf("%w: got %s", ErrInvalidBareItem, reflect.TypeOf(v)))
+	}
+}
+
+// marshalBareItem serializes as defined in
+// https://httpwg.org/specs/rfc9651.html#ser-bare-item.
+func marshalBareItem(b *strings.Builder, v interface{}) error {
+	switch v := v.(type) {
+	case bool:
+		return marshalBoolean(b, v)
+	case string:
+		return marshalString(b, v)
+	case int64:
+		return marshalInteger(b, v)
+	case int, int8, int16, int32:
+		return marshalInteger(b, reflect.ValueOf(v).Int())
+	case uint, uint8, uint16, uint32, uint64:
+		// Casting an uint64 to an int64 is possible because the maximum allowed value is 999,999,999,999,999
+		return marshalInteger(b, int64(reflect.ValueOf(v).Uint()))
+	case float32, float64:
+		return marshalDecimal(b, v.(float64))
+	case []byte:
+		return marshalBinary(b, v)
+	case time.Time:
+		return marshalDate(b, v)
+	case Token:
+		return v.marshalSFV(b)
+	case DisplayString:
+		return v.marshalSFV(b)
+	default:
+		panic(ErrInvalidBareItem)
+	}
+}
+
+// parseBareItem parses as defined in
+// https://httpwg.org/specs/rfc9651.html#parse-bare-item.
+func parseBareItem(s *scanner) (interface{}, error) {
+	if s.eof() {
+		return nil, &UnmarshalError{s.off, ErrUnexpectedEndOfString}
+	}
+
+	c := s.data[s.off]
+	switch c {
+	case '"':
+		return parseString(s)
+	case '?':
+		return parseBoolean(s)
+	case '*':
+		return parseToken(s)
+	case ':':
+		return parseBinary(s)
+	case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
+		return parseNumber(s)
+	case '@':
+		return parseDate(s)
+	case '%':
+		return parseDisplayString(s)
+	default:
+		if isAlpha(c) {
+			return parseToken(s)
+		}
+
+		return nil, &UnmarshalError{s.off, ErrUnrecognizedCharacter}
+	}
+}