Method checkForColon

proto/text_parser.go:401–439

Consume a ':' from the input stream (if the next token is a colon), returning an error if a colon is needed but not present.

(props *Properties, typ reflect.Type)

// Consume a ':' from the input stream (if the next token is a colon),
// returning an error if a colon is needed but not present.
func (p *textParser) checkForColon(props *Properties, typ reflect.Type) *ParseError {
	tok := p.next()
	if tok.err != nil {
		return tok.err
	}
	if tok.value != ":" {
		// Colon is optional when the field is a group or message.
		needColon := true
		switch props.Wire {
		case "group":
			needColon = false
		case "bytes":
			// A "bytes" field is either a message, a string, or a repeated field;
			// those three become *T, *string and []T respectively, so we can check for
			// this field being a pointer to a non-string.
			if typ.Kind() == reflect.Ptr {
				// *T or *string
				if typ.Elem().Kind() == reflect.String {
					break
				}
			} else if typ.Kind() == reflect.Slice {
				// []T or []*T
				if typ.Elem().Kind() != reflect.Ptr {
					break
				}
			} else if typ.Kind() == reflect.String {
				// The proto3 exception is for a string field,
				// which requires a colon.
				break
			}
			needColon = false
		}
		if needColon {
			return p.errorf("expected ':', found %q", tok.value)
		}
		p.back()
	}
	return nil
}

func (p *textParser) readStruct(sv reflect.Value, terminator string) error {
	st := sv.Type()