khenaidoo | ab1f7bd | 2019-11-14 14:00:27 -0500 | [diff] [blame] | 1 | package jsoniter |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "github.com/modern-go/reflect2" |
| 6 | "io" |
| 7 | "reflect" |
| 8 | "unsafe" |
| 9 | ) |
| 10 | |
| 11 | func encoderOfStruct(ctx *ctx, typ reflect2.Type) ValEncoder { |
| 12 | type bindingTo struct { |
| 13 | binding *Binding |
| 14 | toName string |
| 15 | ignored bool |
| 16 | } |
| 17 | orderedBindings := []*bindingTo{} |
| 18 | structDescriptor := describeStruct(ctx, typ) |
| 19 | for _, binding := range structDescriptor.Fields { |
| 20 | for _, toName := range binding.ToNames { |
| 21 | new := &bindingTo{ |
| 22 | binding: binding, |
| 23 | toName: toName, |
| 24 | } |
| 25 | for _, old := range orderedBindings { |
| 26 | if old.toName != toName { |
| 27 | continue |
| 28 | } |
| 29 | old.ignored, new.ignored = resolveConflictBinding(ctx.frozenConfig, old.binding, new.binding) |
| 30 | } |
| 31 | orderedBindings = append(orderedBindings, new) |
| 32 | } |
| 33 | } |
| 34 | if len(orderedBindings) == 0 { |
| 35 | return &emptyStructEncoder{} |
| 36 | } |
| 37 | finalOrderedFields := []structFieldTo{} |
| 38 | for _, bindingTo := range orderedBindings { |
| 39 | if !bindingTo.ignored { |
| 40 | finalOrderedFields = append(finalOrderedFields, structFieldTo{ |
| 41 | encoder: bindingTo.binding.Encoder.(*structFieldEncoder), |
| 42 | toName: bindingTo.toName, |
| 43 | }) |
| 44 | } |
| 45 | } |
| 46 | return &structEncoder{typ, finalOrderedFields} |
| 47 | } |
| 48 | |
| 49 | func createCheckIsEmpty(ctx *ctx, typ reflect2.Type) checkIsEmpty { |
| 50 | encoder := createEncoderOfNative(ctx, typ) |
| 51 | if encoder != nil { |
| 52 | return encoder |
| 53 | } |
| 54 | kind := typ.Kind() |
| 55 | switch kind { |
| 56 | case reflect.Interface: |
| 57 | return &dynamicEncoder{typ} |
| 58 | case reflect.Struct: |
| 59 | return &structEncoder{typ: typ} |
| 60 | case reflect.Array: |
| 61 | return &arrayEncoder{} |
| 62 | case reflect.Slice: |
| 63 | return &sliceEncoder{} |
| 64 | case reflect.Map: |
| 65 | return encoderOfMap(ctx, typ) |
| 66 | case reflect.Ptr: |
| 67 | return &OptionalEncoder{} |
| 68 | default: |
| 69 | return &lazyErrorEncoder{err: fmt.Errorf("unsupported type: %v", typ)} |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | func resolveConflictBinding(cfg *frozenConfig, old, new *Binding) (ignoreOld, ignoreNew bool) { |
| 74 | newTagged := new.Field.Tag().Get(cfg.getTagKey()) != "" |
| 75 | oldTagged := old.Field.Tag().Get(cfg.getTagKey()) != "" |
| 76 | if newTagged { |
| 77 | if oldTagged { |
| 78 | if len(old.levels) > len(new.levels) { |
| 79 | return true, false |
| 80 | } else if len(new.levels) > len(old.levels) { |
| 81 | return false, true |
| 82 | } else { |
| 83 | return true, true |
| 84 | } |
| 85 | } else { |
| 86 | return true, false |
| 87 | } |
| 88 | } else { |
| 89 | if oldTagged { |
| 90 | return true, false |
| 91 | } |
| 92 | if len(old.levels) > len(new.levels) { |
| 93 | return true, false |
| 94 | } else if len(new.levels) > len(old.levels) { |
| 95 | return false, true |
| 96 | } else { |
| 97 | return true, true |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | type structFieldEncoder struct { |
| 103 | field reflect2.StructField |
| 104 | fieldEncoder ValEncoder |
| 105 | omitempty bool |
| 106 | } |
| 107 | |
| 108 | func (encoder *structFieldEncoder) Encode(ptr unsafe.Pointer, stream *Stream) { |
| 109 | fieldPtr := encoder.field.UnsafeGet(ptr) |
| 110 | encoder.fieldEncoder.Encode(fieldPtr, stream) |
| 111 | if stream.Error != nil && stream.Error != io.EOF { |
| 112 | stream.Error = fmt.Errorf("%s: %s", encoder.field.Name(), stream.Error.Error()) |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | func (encoder *structFieldEncoder) IsEmpty(ptr unsafe.Pointer) bool { |
| 117 | fieldPtr := encoder.field.UnsafeGet(ptr) |
| 118 | return encoder.fieldEncoder.IsEmpty(fieldPtr) |
| 119 | } |
| 120 | |
| 121 | func (encoder *structFieldEncoder) IsEmbeddedPtrNil(ptr unsafe.Pointer) bool { |
| 122 | isEmbeddedPtrNil, converted := encoder.fieldEncoder.(IsEmbeddedPtrNil) |
| 123 | if !converted { |
| 124 | return false |
| 125 | } |
| 126 | fieldPtr := encoder.field.UnsafeGet(ptr) |
| 127 | return isEmbeddedPtrNil.IsEmbeddedPtrNil(fieldPtr) |
| 128 | } |
| 129 | |
| 130 | type IsEmbeddedPtrNil interface { |
| 131 | IsEmbeddedPtrNil(ptr unsafe.Pointer) bool |
| 132 | } |
| 133 | |
| 134 | type structEncoder struct { |
| 135 | typ reflect2.Type |
| 136 | fields []structFieldTo |
| 137 | } |
| 138 | |
| 139 | type structFieldTo struct { |
| 140 | encoder *structFieldEncoder |
| 141 | toName string |
| 142 | } |
| 143 | |
| 144 | func (encoder *structEncoder) Encode(ptr unsafe.Pointer, stream *Stream) { |
| 145 | stream.WriteObjectStart() |
| 146 | isNotFirst := false |
| 147 | for _, field := range encoder.fields { |
| 148 | if field.encoder.omitempty && field.encoder.IsEmpty(ptr) { |
| 149 | continue |
| 150 | } |
| 151 | if field.encoder.IsEmbeddedPtrNil(ptr) { |
| 152 | continue |
| 153 | } |
| 154 | if isNotFirst { |
| 155 | stream.WriteMore() |
| 156 | } |
| 157 | stream.WriteObjectField(field.toName) |
| 158 | field.encoder.Encode(ptr, stream) |
| 159 | isNotFirst = true |
| 160 | } |
| 161 | stream.WriteObjectEnd() |
| 162 | if stream.Error != nil && stream.Error != io.EOF { |
| 163 | stream.Error = fmt.Errorf("%v.%s", encoder.typ, stream.Error.Error()) |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | func (encoder *structEncoder) IsEmpty(ptr unsafe.Pointer) bool { |
| 168 | return false |
| 169 | } |
| 170 | |
| 171 | type emptyStructEncoder struct { |
| 172 | } |
| 173 | |
| 174 | func (encoder *emptyStructEncoder) Encode(ptr unsafe.Pointer, stream *Stream) { |
| 175 | stream.WriteEmptyObject() |
| 176 | } |
| 177 | |
| 178 | func (encoder *emptyStructEncoder) IsEmpty(ptr unsafe.Pointer) bool { |
| 179 | return false |
| 180 | } |
| 181 | |
| 182 | type stringModeNumberEncoder struct { |
| 183 | elemEncoder ValEncoder |
| 184 | } |
| 185 | |
| 186 | func (encoder *stringModeNumberEncoder) Encode(ptr unsafe.Pointer, stream *Stream) { |
| 187 | stream.writeByte('"') |
| 188 | encoder.elemEncoder.Encode(ptr, stream) |
| 189 | stream.writeByte('"') |
| 190 | } |
| 191 | |
| 192 | func (encoder *stringModeNumberEncoder) IsEmpty(ptr unsafe.Pointer) bool { |
| 193 | return encoder.elemEncoder.IsEmpty(ptr) |
| 194 | } |
| 195 | |
| 196 | type stringModeStringEncoder struct { |
| 197 | elemEncoder ValEncoder |
| 198 | cfg *frozenConfig |
| 199 | } |
| 200 | |
| 201 | func (encoder *stringModeStringEncoder) Encode(ptr unsafe.Pointer, stream *Stream) { |
| 202 | tempStream := encoder.cfg.BorrowStream(nil) |
| 203 | defer encoder.cfg.ReturnStream(tempStream) |
| 204 | encoder.elemEncoder.Encode(ptr, tempStream) |
| 205 | stream.WriteString(string(tempStream.Buffer())) |
| 206 | } |
| 207 | |
| 208 | func (encoder *stringModeStringEncoder) IsEmpty(ptr unsafe.Pointer) bool { |
| 209 | return encoder.elemEncoder.IsEmpty(ptr) |
| 210 | } |