{
    "$id": "https://fuchsia.dev/schema/src/fonts/tools/schemas/fontcfg.schema.json",
    "$schema": "http://json-schema.org/draft-07/schema#",
    "description": "A manually written, product-specific font configuration.\nRecommended extension: .fontcfg.json",
    "type": "object",
    "definitions": {
        "typeface_reference": {
            "oneOf": [
                {
                    "$ref": "#/definitions/file_name"
                },
                {
                    "type": "object",
                    "required": [
                        "file_name"
                    ],
                    "properties": {
                        "file_name": {
                            "$ref": "#/definitions/file_name"
                        },
                        "index": {
                            "type": "integer",
                            "minimum": 0,
                            "description": "Index of the typeface within the font file"
                        }
                    }
                },
                {
                    "type": "object",
                    "required": [
                        "full_name"
                    ],
                    "properties": {
                        "full_name": {
                            "type": "string",
                            "minLength": 1,
                            "description": "The human-readable \"full name\" of the typeface, from the typeface's metadata"
                        }
                    }
                }
            ]
        },
        "file_name": {
            "type": "string",
            "pattern": "^[a-zA-Z0-9_\\-.]+\\.[a-zA-Z0-9_\\-]+$",
            "description": "The name of the font file",
            "examples": [
                "Roboto-Regular.ttf",
                "NotoSans-CJK.ttc"
            ]
        },
        "settings": {
            "type": "object",
            "properties": {
                "cache_size_bytes": {
                    "type": "integer",
                    "minimum": 0,
                    "description": "Maximum size of the in-memory font asset cache, in bytes"
                }
            }
        }
    },
    "required": [
        "version"
    ],
    "properties": {
        "version": {
            "type": "string",
            "description": "Schema version",
            "pattern": "^[0-9]+$"
        },
        "fallback_chain": {
            "type": "array",
            "items": {
                "$ref": "#/definitions/typeface_reference"
            },
            "description": "Sequence of fallback typefaces for the target product"
        }
    }
}