{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "title": "Theme Definition",
  "description": "A JSON schema for describing the available keys and value types for an Asciidoctor PDF theme. Status: Incomplete; early draft.",
  "definitions": {
    // FIXME add RGB and CMYK arrays
    "color": {
      "type": "string",
      "pattern": "^#?[a-fA-F0-9]{3,6}$"
    },
    "font_style": {
      "type": "string",
      "enum": ["normal", "bold", "italic", "bold_italic"]
    },
    "measurement": {
      "oneOf": [
        {
          "type": "string",
          "pattern": "^[0-9]+(?:\\.[0-9]+)?(?:in|mm|cm|pt)?$"
        },
        {
          // FIXME technically, numbers < 0 must have a leading 0 (e.g., 0.8)
          "type": "number"
        }
      ]
    },
    "text_alignment": {
      "type": "string",
      "enum": ["left", "center", "right", "justify"]
    }
  },
  "type": "object",
  "properties": {
    "page_background_color": {
      "$ref": "#/definitions/color",
      "default": "#FFFFFF"
    },
    "page_background_image": {
      "type": "string"
    },
    "page_layout": {
      "type": "string",
      "enum": ["portrait", "landscape"],
      "default": "portrait"
    },
    "page_margin": {
      "type": "array",
      "minItems": 4,
      "maxItems": 4,
      "items": {
        "$ref": "#/definitions/measurement"
      },
      "additionalItems": false
    },
    "page_size": {
      "oneOf": [
        {
          "type": "string",
          "enum": ["A4", "Executive", "Folio", "Legal", "Letter", "Tabloid"]
        },
        {
          "type": "array",
          "minItems": 2,
          "maxItems": 2,
          "items": {
            "$ref": "#/definitions/measurement"
          }
        }
      ],
      "default": "Letter"
    },
    "base_align": {
      "$ref": "#/definitions/text_alignment",
      "default": "left"
    },
    "base_border_color": {
      "$ref": "#/definitions/color"
    },
    "base_border_radius": {
      "type": "number"
    },
    "base_border_width": {
      "type": "number"
    },
    "base_font_color": {
      "$ref": "#/definitions/color",
      "default": "#000000"
    },
    "base_font_family": {
      "type": "string",
      "default": "Helvetica"
    },
    "base_font_size": {
      "type": "number",
      "default": 12
    },
    "base_font_style": {
      "$ref": "#/definitions/font_style",
      "default": "normal"
    },
    "base_line_height": {
      "type": "number"
    },
    "base_line_height_length": {
      "$ref": "#/definitions/measurement"
    },
    "base_font_size_large": {
      "type": "number"
    },
    "base_font_size_small": {
      "type": "number"
    }
  }
}