README.md

@@ -1,31 +1,11 @@
 # go-jsonschema
 
-A [JSON schema] code generator for Go.
+A JSON schema code generator for Go.
-
-JSON schema draft 2020-12 is supported.
 
 ## Usage
 
     jsonschemagen -s <schema> -o <output>
 
-One Go type per definition will be generated.
-
-- `int64` is used for `"type": "integer"`.
-- `json.Number` is used for `"type": "number"`.
-- Go structs are generated for objects with `"additionalProperties": false`.
-- `json.RawMessage` is used when a value can have multiple types. Helpers are
-  generated for `allOf`, `anyOf`, `oneOf`, `then`, `else` and `dependantSchemas`
-  which are references.
-
-## Contributing
-
-Report bugs and send patches to the [mailing list]. Discuss in [#emersion] on
-Libera Chat.
-
 ## License
 
 MIT
-
-[JSON schema]: https://json-schema.org/
-[mailing list]: https://lists.sr.ht/~emersion/public-inbox
-[#emersion]: ircs://irc.libera.chat/#emersion

cmd/jsonschemagen/main.go

@@ -52,11 +52,8 @@ func resolveRef(def *jsonschema.Schema, root *jsonschema.Schema) *jsonschema.Sch
 }
 
 func schemaType(schema *jsonschema.Schema) jsonschema.Type {
-	switch {
+	if schema.Type != "" {
-	case len(schema.Type) == 1:
+		return schema.Type
-		return schema.Type[0]
-	case len(schema.Type) > 0:
-		return ""
 	}
 
 	var v interface{}
@@ -128,40 +125,9 @@ func noAdditionalProps(schema *jsonschema.Schema) bool {
 	return schema.AdditionalProperties != nil && schema.AdditionalProperties.IsFalse()
 }
 
-// unwrapNullableSchema unwraps a schema in the form:
-//
-//	{
-//		"oneOf": {
-//			{ "type": "null" },
-//			<sub-schema>
-//		}
-//	}
-func unwrapNullableSchema(schema *jsonschema.Schema) (*jsonschema.Schema, bool) {
-	for _, choices := range [][]jsonschema.Schema{schema.AnyOf, schema.OneOf} {
-		if len(choices) != 2 {
-			continue
-		}
-
-		nullIndex := -1
-		for i, choice := range choices {
-			if len(choice.Type) == 1 && choice.Type[0] == jsonschema.TypeNull {
-				nullIndex = i
-				break
-			}
-		}
-		if nullIndex < 0 {
-			continue
-		}
-
-		otherIndex := (nullIndex + 1) % 2
-		return &choices[otherIndex], true
-	}
-	return nil, false
-}
-
 func generateSchemaType(schema *jsonschema.Schema, root *jsonschema.Schema, required bool) jen.Code {
 	if schema == nil {
-		schema = &jsonschema.Schema{}
+		return jen.Interface()
 	}
 
 	refName := refName(schema.Ref)
@@ -174,10 +140,6 @@ func generateSchemaType(schema *jsonschema.Schema, root *jsonschema.Schema, requ
 		return t
 	}
 
-	if subschema, ok := unwrapNullableSchema(schema); ok {
-		return jen.Op("*").Add(generateSchemaType(subschema, root, true))
-	}
-
 	switch schemaType(schema) {
 	case jsonschema.TypeNull:
 		return jen.Struct()
@@ -186,7 +148,7 @@ func generateSchemaType(schema *jsonschema.Schema, root *jsonschema.Schema, requ
 	case jsonschema.TypeArray:
 		return jen.Index().Add(generateSchemaType(schema.Items, root, required))
 	case jsonschema.TypeNumber:
-		return jen.Qual("encoding/json", "Number")
+		return jen.Float64()
 	case jsonschema.TypeString:
 		return jen.String()
 	case jsonschema.TypeInteger:
@@ -227,15 +189,6 @@ func generateDef(schema *jsonschema.Schema, root *jsonschema.Schema, f *jen.File
 		for _, child := range schema.OneOf {
 			children = append(children, child)
 		}
-		if schema.Then != nil {
-			children = append(children, *schema.Then)
-		}
-		if schema.Else != nil {
-			children = append(children, *schema.Else)
-		}
-		for _, child := range schema.DependentSchemas {
-			children = append(children, child)
-		}
 
 		for _, child := range children {
 			refName := refName(child.Ref)

schema.go

@@ -17,25 +17,6 @@ const (
 	TypeInteger Type = "integer"
 )
 
-type TypeSet []Type
-
-func (ts *TypeSet) UnmarshalJSON(b []byte) error {
-	if b[0] == '[' {
-		type rawTypeSet TypeSet
-		out := (*rawTypeSet)(ts)
-		return json.Unmarshal(b, out)
-	} else {
-		var t Type
-		err := json.Unmarshal(b, &t)
-		if err != nil {
-			*ts = nil
-		} else {
-			*ts = []Type{t}
-		}
-		return err
-	}
-}
-
 type Schema struct {
 	// Core
 	Schema     string            `json:"$schema"`
@@ -70,7 +51,7 @@ type Schema struct {
 	PropertyNames        *Schema           `json:"propertyNames"`
 
 	// Validation
-	Type  TypeSet       `json:"type"`
+	Type  Type          `json:"type"`
 	Enum  []interface{} `json:"enum"`
 	Const interface{}   `json:"const"`
 
@@ -111,7 +92,7 @@ type Schema struct {
 
 func (schema *Schema) UnmarshalJSON(b []byte) error {
 	if bytes.Equal(b, []byte("true")) {
-		*schema = Schema{}
+		// Nothing to do
 	} else if bytes.Equal(b, []byte("false")) {
 		*schema = Schema{Not: []Schema{
 			Schema{},