{
    "$id": "https://scratch.mit.edu/sb3_definitions.json",
    "$schema": "http://json-schema.org/schema#",
    "description": "Scratch 3.0 Project and Sprite Schema Definitions",
    "definitions": {
        "optionalString": {
            "oneOf": [
                {"type": "string"},
                {"type": "null"}
            ]
        },
        "optionalNumber": {
            "oneOf": [
                {"type": "number"},
                {"type": "null"}
            ]
        },
        "boolOrOptBoolString": {
            "oneOf": [
                {"type": "string",
                 "enum": ["true", "false", "null"]},
                {"type": "boolean"},
                {"type": "null"}
            ]
        },
        "stringOrNumber": {
            "oneOf": [
                {"type": "string"},
                {"type": "number"}
            ]
        },
        "scalarVal": {},
        "assetId": {
            "type": "string",
            "pattern": "^[a-fA-F0-9]{32}$"
        },
        "costume": {
            "type": "object",
            "properties": {
                "assetId": { "$ref": "#/definitions/assetId"},
                "bitmapResolution": {
                    "type": "integer"
                },
                "dataFormat": {
                    "type": "string",
                    "enum": ["png", "svg", "jpeg", "jpg", "bmp", "gif"]
                },
                "md5ext": {
                    "type": "string",
                    "pattern": "^[a-fA-F0-9]{32}\\.[a-zA-Z]+$"
                },
                "name": {
                    "type": "string"
                },
                "rotationCenterX": {
                    "type": "number",
                    "description": "This property is not required, but is highly recommended."
                },
                "rotationCenterY": {
                    "type": "number",
                    "description": "This property is not required, but is highly recommended."
                }
            },
            "required": [
                "assetId",
                "dataFormat",
                "name"
            ]
        },
        "sound": {
            "type": "object",
            "properties": {
                "assetId": { "$ref": "#/definitions/assetId"},
                "dataFormat": {
                    "type": "string",
                    "enum": ["wav", "wave", "mp3"]
                },
                "md5ext": {
                    "type": "string",
                    "pattern": "^[a-fA-F0-9]{32}\\.[a-zA-Z0-9]+$"
                },
                "name": {
                    "type": "string"
                },
                "rate": {
                    "type": "integer"
                },
                "sampleCount": {
                    "type": "integer"
                }
            },
            "required": [
                "assetId",
                "dataFormat",
                "name"
            ]
        },
        "scalar_variable": {
            "type": "array",
            "items": [
                {"type": "string", "description": "name of the variable"},
                {"$ref":"#/definitions/scalarVal", "description": "value of the variable"}
            ],
            "additionalItems": {"type": "boolean", "enum": [true], "description": "Whether this is a cloud variable"},
            "maxItems": 3
        },
        "list": {
            "type": "array",
            "items": [
                {"type":"string", "description": "name of the list"},
                {
                    "type": "array",
                    "description": "contents of the list",
                    "items": {"$ref":"#/definitions/scalarVal"}
                }
            ],
            "additionalItems": false
        },
        "broadcast_message": {
            "type": "string",
            "description": "the message being broadcasted"
        },
        "num_primitive": {
            "type": "array",
            "items": [
                {
                    "type": "number",
                    "enum": [4,5,6,7,8]
                },
                {"$ref":"#/definitions/stringOrNumber"}
            ],
            "additionalItems": false
        },
        "color_primitive": {
            "type": "array",
            "items": [
                {
                    "type": "number",
                    "enum": [9]
                },
                {
                    "type": "string",
                    "pattern": "^#[a-fA-F0-9]{6}$"
                }
            ],
            "additionalItems": false
        },
        "text_primitive": {
            "type": "array",
            "items": [
                {
                    "type": "number",
                    "enum": [10]
                },
                {"$ref":"#/definitions/stringOrNumber"}
            ],
            "additionalItems": false
        },
        "broadcast_primitive": {
            "type": "array",
            "items": [
                {
                    "type": "number",
                    "enum": [11]
                },
                {"type": "string", "description": "broadcast message"},
                {"type": "string", "description": "broadcast message id"}
            ],
            "additionalItems": false
        },
        "variable_primitive": {
            "type": "array",
            "items": [
                {
                    "type": "number",
                    "enum": [12]
                },
                {"type": "string", "description": "variable name"},
                {"type": "string", "description": "variable id"}
            ],
            "additionalItems": {
                "type": "number"
            },
            "minItems": 3,
            "maxItems": 5
        },
        "list_primitive": {
            "type": "array",
            "items": [
                {
                    "type": "number",
                    "enum": [13]
                },
                {"type": "string", "description": "list name"},
                {"type": "string", "description": "list id"}
            ],
            "additionalItems": {
                "type": "number"
            },
            "minItems": 3,
            "maxItems": 5
        },
        "topLevelPrimitive": {
            "oneOf": [
                {"$ref":"#/definitions/variable_primitive"},
                {"$ref":"#/definitions/list_primitive"}
            ]
        },
        "inputPrimitive": {
            "oneOf": [
                {"$ref":"#/definitions/num_primitive"},
                {"$ref":"#/definitions/color_primitive"},
                {"$ref":"#/definitions/text_primitive"},
                {"$ref":"#/definitions/broadcast_primitive"},
                {"$ref":"#/definitions/variable_primitive"},
                {"$ref":"#/definitions/list_primitive"}
            ]
        },
        "block": {
            "type": "object",
            "properties": {
                "opcode": {
                    "type": "string"
                },
                "comment": {
                    "type": "string"
                },
                "inputs": {
                    "type": "object",
                    "additionalProperties": {
                        "type": "array",
                        "items": [
                            {
                                "type":"number",
                                "enum":[1,2,3],
                                "description": "1 = unobscured shadow, 2 = no shadow, 3 = obscured shadow"
                            }
                        ],
                        "additionalItems": {
                            "oneOf": [
                                {"$ref":"#/definitions/optionalString"},
                                {"$ref":"#/definitions/inputPrimitive"}
                            ]
                        }
                    }
                },
                "fields": {
                    "type": "object"
                },
                "next": {"$ref":"#/definitions/optionalString"},
                "topLevel": {
                    "type": "boolean"
                },
                "parent": {"$ref":"#/definitions/optionalString"},
                "shadow": {
                    "type": "boolean"
                },
                "x": {
                    "type": "number"
                },
                "y": {
                    "type": "number"
                },
                "mutation": {
                    "type": "object",
                    "properties": {
                        "tagName": {
                            "type": "string",
                            "enum": ["mutation"]
                        },
                        "children": {
                            "type": "array"
                        },
                        "proccode": {
                            "type": "string"
                        },
                        "argumentids": {
                            "type": "string"
                        },
                        "warp": {"$ref":"#/definitions/boolOrOptBoolString"},
                        "hasnext": {"$ref":"#/definitions/boolOrOptBoolString"}
                    }
                }
            },
            "required": [
                "opcode"
            ]
        },
        "comment": {
            "type": "object",
            "properties": {
                "blockId": {"$ref": "#/definitions/optionalString"},
                "text": {
                    "type": "string",
                    "maxLength": 8000
                },
                "minimized": {"type": "boolean"},
                "x": {"$ref": "#/definitions/optionalNumber"},
                "y": {"$ref": "#/definitions/optionalNumber"},
                "width": {"type": "number"},
                "height": {"type": "number"}
            },
            "required": [
                "text"
            ]
        },
        "stage": {
            "type": "object",
            "description": "Description of property (and/or property/value pairs) that are unique to the stage.",
            "properties": {
                "name": {
                    "type": "string",
                    "enum": ["Stage"]
                },
                "isStage": {
                    "type": "boolean",
                    "enum": [true]
                },
                "tempo": {
                    "type": "number"
                },
                "videoTransparency": {
                    "type": "number"
                },
                "videoState": {
                    "type": "string",
                    "enum": ["on", "off", "on-flipped"]
                },
                "layerOrder": {
                    "type": "integer",
                    "enum": [0],
                    "description": "The layer order of the stage should be 0, if specified."
                }
            },
            "required": [
                "name",
                "isStage"
            ]
        },
        "sprite": {
            "type": "object",
            "description": "Description of property (and/or property/value pairs) for sprites.",
            "properties": {
                "name": {
                    "type": "string",
                    "not": {"enum": ["_stage_"]}
                },
                "isStage": {
                    "type": "boolean",
                    "enum": [false]
                },
                "visible": {
                    "type": "boolean"
                },
                "x": {
                    "type": "number"
                },
                "y": {
                    "type": "number"
                },
                "size": {
                    "type": "number"
                },
                "direction": {
                    "type": "number"
                },
                "draggable": {
                    "type": "boolean"
                },
                "rotationStyle": {
                    "type": "string",
                    "enum": ["all around", "don't rotate", "left-right"]
                },
                "layerOrder": {
                    "type": "integer",
                    "minimum": 1,
                    "description": "The layer order of a sprite should be a positive number, if specified."
                }
            },
            "required": [
                "name",
                "isStage"
            ]
        },
        "target": {
            "type": "object",
            "description" : "Properties common to both Scratch 3.0 Stage and Sprite",
            "properties": {
                "currentCostume": {
                    "type": "integer",
                    "minimum": 0
                },
                "blocks": {
                    "type": "object",
                    "additionalProperties": {
                        "oneOf": [
                            {"$ref":"#/definitions/block"},
                            {"$ref":"#/definitions/topLevelPrimitive"}
                        ]
                    }
                },
                "variables": {
                    "type": "object",
                    "additionalProperties": {"$ref":"#/definitions/scalar_variable"}
                },
                "lists": {
                    "type": "object",
                    "additionalProperties": {"$ref":"#/definitions/list"}
                },
                "broadcasts": {
                    "type": "object",
                    "additionalProperties": {"$ref":"#/definitions/broadcast_message"}
                },
                "comments": {
                    "type": "object",
                    "additionalProperties": {"$ref": "#/definitions/comment"}
                },
                "costumes": {
                    "type": "array",
                    "items": {"$ref":"#/definitions/costume"},
                    "minItems": 1,
                    "uniqueItems": true
                },
                "sounds": {
                    "type": "array",
                    "items": {"$ref":"#/definitions/sound"},
                    "uniqueItems": true
                },
                "volume": {
                    "type": "number"
                }
            },
            "required": [
                "variables",
                "costumes",
                "sounds",
                "blocks"
            ]
        }
    }
}