const maxListMembers … const listDelimiters … const memberDelimiter … const errInvalidKey … const errInvalidValue … const errInvalidMember … const errMemberNumber … const errDuplicate … type member … // according to (chr = %x20 / (nblk-char = %x21-2B / %x2D-3C / %x3E-7E) ) // means (chr = %x20-2B / %x2D-3C / %x3E-7E) . func checkValueChar(v byte) bool { … } // according to (nblk-chr = %x21-2B / %x2D-3C / %x3E-7E) . func checkValueLast(v byte) bool { … } // based on the W3C Trace Context specification // // value = (0*255(chr)) nblk-chr // nblk-chr = %x21-2B / %x2D-3C / %x3E-7E // chr = %x20 / nblk-chr // // see https://www.w3.org/TR/trace-context-1/#value func checkValue(val string) bool { … } func checkKeyRemain(key string) bool { … } // according to // // simple-key = lcalpha (0*255( lcalpha / DIGIT / "_" / "-"/ "*" / "/" )) // system-id = lcalpha (0*13( lcalpha / DIGIT / "_" / "-"/ "*" / "/" )) // // param n is remain part length, should be 255 in simple-key or 13 in system-id. func checkKeyPart(key string, n int) bool { … } func isAlphaNum(c byte) bool { … } // according to // // tenant-id = ( lcalpha / DIGIT ) 0*240( lcalpha / DIGIT / "_" / "-"/ "*" / "/" ) // // param n is remain part length, should be 240 exactly. func checkKeyTenant(key string, n int) bool { … } // based on the W3C Trace Context specification // // key = simple-key / multi-tenant-key // simple-key = lcalpha (0*255( lcalpha / DIGIT / "_" / "-"/ "*" / "/" )) // multi-tenant-key = tenant-id "@" system-id // tenant-id = ( lcalpha / DIGIT ) (0*240( lcalpha / DIGIT / "_" / "-"/ "*" / "/" )) // system-id = lcalpha (0*13( lcalpha / DIGIT / "_" / "-"/ "*" / "/" )) // lcalpha = %x61-7A ; a-z // // see https://www.w3.org/TR/trace-context-1/#tracestate-header. func checkKey(key string) bool { … } func newMember(key, value string) (member, error) { … } func parseMember(m string) (member, error) { … } // String encodes member into a string compliant with the W3C Trace Context // specification. func (m member) String() string { … } type TraceState … var _ … // ParseTraceState attempts to decode a TraceState from the passed // string. It returns an error if the input is invalid according to the W3C // Trace Context specification. func ParseTraceState(ts string) (TraceState, error) { … } // MarshalJSON marshals the TraceState into JSON. func (ts TraceState) MarshalJSON() ([]byte, error) { … } // String encodes the TraceState into a string compliant with the W3C // Trace Context specification. The returned string will be invalid if the // TraceState contains any invalid members. func (ts TraceState) String() string { … } // Get returns the value paired with key from the corresponding TraceState // list-member if it exists, otherwise an empty string is returned. func (ts TraceState) Get(key string) string { … } // Insert adds a new list-member defined by the key/value pair to the // TraceState. If a list-member already exists for the given key, that // list-member's value is updated. The new or updated list-member is always // moved to the beginning of the TraceState as specified by the W3C Trace // Context specification. // // If key or value are invalid according to the W3C Trace Context // specification an error is returned with the original TraceState. // // If adding a new list-member means the TraceState would have more members // then is allowed, the new list-member will be inserted and the right-most // list-member will be dropped in the returned TraceState. func (ts TraceState) Insert(key, value string) (TraceState, error) { … } // Delete returns a copy of the TraceState with the list-member identified by // key removed. func (ts TraceState) Delete(key string) TraceState { … } // Len returns the number of list-members in the TraceState. func (ts TraceState) Len() int { … }
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