src/fonts/tools/schemas/fontcfg.schema.json

{
  "$id": "http://fuchsia.com/src/fonts/tools/schemas/fontcfg.schema.json",
  "$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"
            }
          }
        }
      ]
    },
    "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"
    }
  }
}