|
| 1 | +package gen |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "github.com/jhump/protoreflect/desc/builder" |
| 6 | + "github.com/jhump/protoreflect/desc/protoprint" |
| 7 | + "github.com/tidwall/gjson" |
| 8 | + "strings" |
| 9 | + "unicode" |
| 10 | +) |
| 11 | + |
| 12 | +func Generate(packageName, rootMessage string, rawJson []byte) (string, error) { |
| 13 | + |
| 14 | + rootMsg := builder.NewMessage(rootMessage) |
| 15 | + |
| 16 | + parseJSON("", gjson.ParseBytes(rawJson), rootMsg, make(map[string]*builder.MessageBuilder)) |
| 17 | + |
| 18 | + fileBuilder := builder.NewFile(packageName). |
| 19 | + SetPackageName(packageName). |
| 20 | + AddMessage(rootMsg) |
| 21 | + |
| 22 | + fileBuilder.SetProto3(true) |
| 23 | + |
| 24 | + printer := protoprint.Printer{ |
| 25 | + Indent: " ", |
| 26 | + Compact: true, |
| 27 | + } |
| 28 | + |
| 29 | + fd, err := fileBuilder.Build() |
| 30 | + if err != nil { |
| 31 | + return "", err |
| 32 | + } |
| 33 | + |
| 34 | + return printer.PrintProtoToString(fd) |
| 35 | +} |
| 36 | + |
| 37 | +func parseJSON(prefix string, result gjson.Result, msgBuilder *builder.MessageBuilder, messageCache map[string]*builder.MessageBuilder) { |
| 38 | + if !result.IsObject() { |
| 39 | + return |
| 40 | + } |
| 41 | + |
| 42 | + result.ForEach(func(key, value gjson.Result) bool { |
| 43 | + fieldName := toSnakeCase(key.String()) |
| 44 | + |
| 45 | + switch { |
| 46 | + case value.IsObject(): |
| 47 | + nestedMsgName := strings.Title(key.String()) |
| 48 | + var nestedMsg *builder.MessageBuilder |
| 49 | + |
| 50 | + if cached, ok := messageCache[nestedMsgName]; ok { |
| 51 | + nestedMsg = cached |
| 52 | + } else { |
| 53 | + nestedMsg = builder.NewMessage(nestedMsgName) |
| 54 | + messageCache[nestedMsgName] = nestedMsg |
| 55 | + parseJSON(prefix+key.String()+".", value, nestedMsg, messageCache) |
| 56 | + msgBuilder.AddNestedMessage(nestedMsg) |
| 57 | + } |
| 58 | + |
| 59 | + msgBuilder.AddField( |
| 60 | + builder.NewField(fieldName, builder.FieldTypeMessage(nestedMsg)), |
| 61 | + ) |
| 62 | + |
| 63 | + case value.IsArray(): |
| 64 | + if len(value.Array()) > 0 { |
| 65 | + firstElement := value.Array()[0] |
| 66 | + if firstElement.IsObject() { |
| 67 | + |
| 68 | + nestedMsgName := strings.Title(strings.TrimSuffix(key.String(), "s")) |
| 69 | + var nestedMsg *builder.MessageBuilder |
| 70 | + |
| 71 | + if cached, ok := messageCache[nestedMsgName]; ok { |
| 72 | + nestedMsg = cached |
| 73 | + } else { |
| 74 | + nestedMsg = builder.NewMessage(nestedMsgName) |
| 75 | + messageCache[nestedMsgName] = nestedMsg |
| 76 | + parseJSON(prefix+key.String()+".", firstElement, nestedMsg, messageCache) |
| 77 | + msgBuilder.AddNestedMessage(nestedMsg) |
| 78 | + } |
| 79 | + |
| 80 | + msgBuilder.AddField( |
| 81 | + builder.NewField(fieldName, builder.FieldTypeMessage(nestedMsg)). |
| 82 | + SetRepeated(), |
| 83 | + ) |
| 84 | + } else { |
| 85 | + msgBuilder.AddField( |
| 86 | + builder.NewField(fieldName, getProtoType(firstElement)). |
| 87 | + SetRepeated(), |
| 88 | + ) |
| 89 | + } |
| 90 | + } |
| 91 | + |
| 92 | + default: |
| 93 | + msgBuilder.AddField( |
| 94 | + builder.NewField(fieldName, getProtoType(value)), |
| 95 | + ) |
| 96 | + } |
| 97 | + return true |
| 98 | + }) |
| 99 | +} |
| 100 | + |
| 101 | +func getProtoType(value gjson.Result) *builder.FieldType { |
| 102 | + switch { |
| 103 | + case gjson.String == value.Type: |
| 104 | + return builder.FieldTypeString() |
| 105 | + case gjson.Number == value.Type: |
| 106 | + if value.Raw == fmt.Sprintf("%.0f", value.Float()) { |
| 107 | + return builder.FieldTypeInt64() |
| 108 | + } |
| 109 | + return builder.FieldTypeDouble() |
| 110 | + case value.IsBool(): |
| 111 | + return builder.FieldTypeBool() |
| 112 | + default: |
| 113 | + return builder.FieldTypeString() |
| 114 | + } |
| 115 | +} |
| 116 | + |
| 117 | +func toSnakeCase(s string) string { |
| 118 | + var result strings.Builder |
| 119 | + for i, r := range s { |
| 120 | + if i > 0 && r >= 'A' && r <= 'Z' { |
| 121 | + result.WriteRune('_') |
| 122 | + } |
| 123 | + result.WriteRune(unicode.ToLower(r)) |
| 124 | + } |
| 125 | + return result.String() |
| 126 | +} |
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