jschema

package main

import (
	"fmt"

	"github.com/NaturalSelectionLabs/jschema"
	"github.com/NaturalSelectionLabs/jschema/lib/test"
	"github.com/naturalselectionlabs/vary"
)

func main() {
	// Create a schema list instance
	schemas := jschema.New("#/components/schemas")

	type Metadata interface{}

	// Make the metadata field accept either A or B
	iMetadata := vary.New(new(Metadata))

	type A string

	iMetadata.Add(A(""))

	type B int

	iMetadata.Add(B(0))

	type Node struct {
		// Use the pattern or format tag to set the standard json schema validation rule
		Name     string   `json:"name" pattern:"^[a-z]+$" format:"name"`
		Metadata Metadata `json:"metadata,omitempty"` // omitempty make this field optional
		Version  string   `json:"version"`
		// jschema supports github.com/dmarkham/enumer generated enum
		// The enum type must implements [jschema.Enum] or [jschema.EnumString].
		// Otherwise, it will be treated as a normal type.
		Enum test.Enum `json:"enum"`
	}

	schemas.Define(Node{})
	node := schemas.PeakSchema(Node{})

	// Define default value
	{
		node.Properties["name"].Default = "jack"
	}

	// Define constants
	{
		node.Properties["version"] = schemas.Const("v1")
	}

	fmt.Println(schemas.String())

}

Output:

{
  "A": {
    "title": "A",
    "description": "github.com/NaturalSelectionLabs/jschema_test.A",
    "type": "string"
  },
  "B": {
    "title": "B",
    "description": "github.com/NaturalSelectionLabs/jschema_test.B",
    "type": "integer"
  },
  "Enum": {
    "title": "Enum",
    "description": "github.com/NaturalSelectionLabs/jschema/lib/test.Enum",
    "enum": [
      "one",
      "three",
      "two"
    ]
  },
  "Metadata": {
    "title": "Metadata",
    "description": "github.com/NaturalSelectionLabs/jschema_test.Metadata",
    "anyOf": [
      {
        "$ref": "#/components/schemas/A"
      },
      {
        "$ref": "#/components/schemas/B"
      }
    ]
  },
  "Node": {
    "title": "Node",
    "description": "github.com/NaturalSelectionLabs/jschema_test.Node",
    "type": "object",
    "properties": {
      "enum": {
        "$ref": "#/components/schemas/Enum"
      },
      "metadata": {
        "$ref": "#/components/schemas/Metadata"
      },
      "name": {
        "default": "jack",
        "type": "string",
        "format": "name",
        "pattern": "^[a-z]+$"
      },
      "version": {
        "type": "string",
        "enum": [
          "v1"
        ]
      }
    },
    "required": [
      "name",
      "version",
      "enum"
    ],
    "additionalProperties": false
  }
}