| 1 | package steward |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "reflect" |
| 6 | "strings" |
| 7 | "unicode" |
| 8 | "unicode/utf8" |
| 9 | |
| 10 | "go.bigb.es/auxilia/collect" |
| 11 | "go.bigb.es/auxilia/fn" |
| 12 | ) |
| 13 | |
| 14 | type ( |
| 15 | structField = collect.Tuple2[reflect.StructField, reflect.Value] |
| 16 | structFieldIterator collect.ListIterator[structField] |
| 17 | ) |
| 18 | |
| 19 | func structFieldIteratorFromType(p reflect.Value) structFieldIterator { |
| 20 | if p.Kind() == reflect.Pointer { |
| 21 | p = p.Elem() |
| 22 | } |
| 23 | |
| 24 | if p.Kind() != reflect.Struct { |
| 25 | panic(fmt.Sprintf("expected 'struct', got '%s'", p.Kind().String())) |
| 26 | } |
| 27 | |
| 28 | pos := -1 |
| 29 | |
| 30 | return collect.NewListIterator[structField](func() (structField, bool) { |
| 31 | pos++ |
| 32 | |
| 33 | if pos >= p.NumField() { |
| 34 | return structField{}, false |
| 35 | } |
| 36 | |
| 37 | return collect.NewTuple2( |
| 38 | p.Type().Field(pos), |
| 39 | p.Field(pos), |
| 40 | ), true |
| 41 | }, p.NumField()) |
| 42 | } |
| 43 | |
| 44 | func typesEqual(l, r reflect.Type) bool { |
| 45 | return l == r || (l.Kind() == reflect.Pointer && l.Elem() == r) |
| 46 | } |
| 47 | |
| 48 | func isPublic(field reflect.StructField) bool { |
| 49 | r, _ := utf8.DecodeRuneInString(field.Name) |
| 50 | if r == utf8.RuneError { |
| 51 | return false |
| 52 | } |
| 53 | |
| 54 | return !unicode.IsLower(r) |
| 55 | } |
| 56 | |
| 57 | func hasTag(field reflect.StructField, tag string) bool { |
| 58 | return fn.SecondOf2(field.Tag.Lookup(tag)) |
| 59 | } |
| 60 | |
| 61 | func parseBool(in string) bool { |
| 62 | switch strings.TrimSpace(strings.ToLower(in)) { |
| 63 | case "true": |
| 64 | return true |
| 65 | default: |
| 66 | return false |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | func hasTagBool(field reflect.StructField, tagKey string) bool { |
| 71 | rawBool, ok := field.Tag.Lookup(tagKey) |
| 72 | if !ok { |
| 73 | return false |
| 74 | } |
| 75 | return parseBool(rawBool) |
| 76 | } |
| 77 | |
| 78 | func isComparable(value any) bool { |
| 79 | return reflect.TypeOf(value).Comparable() |
| 80 | } |
| 81 | |
| 82 | func isInterface(l reflect.Type) bool { |
| 83 | return l.Kind() == reflect.Interface |
| 84 | } |
| 85 | |
| 86 | func isPointerToStruct(l reflect.Type) bool { |
| 87 | return l.Kind() == reflect.Ptr && l.Elem().Kind() == reflect.Struct |
| 88 | } |
| 89 | |
| 90 | func isListOfInterfacesOrPointersToStructs(l reflect.Type) bool { |
| 91 | return l.Kind() == reflect.Slice && (isInterface(l.Elem()) || isPointerToStruct(l.Elem())) |
| 92 | } |
| 93 | |
| 94 | func isSingleInjectType(l reflect.Type) bool { |
| 95 | return isInterface(l) || isPointerToStruct(l) |
| 96 | } |
| 97 | |
| 98 | func isMultiInjectType(l reflect.Type) bool { |
| 99 | return isListOfInterfacesOrPointersToStructs(l) |
| 100 | } |
| 101 | |
| 102 | func isAllowedInjectType(l reflect.Type) bool { |
| 103 | return isInterface(l) || isPointerToStruct(l) || isListOfInterfacesOrPointersToStructs(l) |
| 104 | } |
| 105 | |