{
  "type": "object",

  "required": [
    "name",
    "rules"
  ],

  "additionalProperties": false,

  "properties": {
    "name": {
      "type": "string",
      "pattern": "^[a-zA-Z_]\\w*"
    },

    "rules": {
      "type": "object",
      "patternProperties": {
        "^[a-zA-Z_]\\w*$": {
          "$ref": "#/definitions/rule"
        }
      },
      "additionalProperties": false
    },

    "extras": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/rule"
      }
    },

    "conflicts": {
      "type": "array",
      "items": {
        "type": "array",
        "items": {
          "type": "string",
          "pattern": "^[a-zA-Z_]\\w*$"
        }
      }
    }
  },

  "definitions": {
    "blank-rule": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^BLANK$"
        }
      },
      "required": ["type"]
    },

    "string-rule": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^STRING$"
        },
        "value": {
          "type": "string"
        }
      },
      "required": ["type", "value"]
    },

    "pattern-rule": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^PATTERN$"
        },
        "value": {"type": "string"}
      },
      "required": ["type", "value"]
    },

    "symbol-rule": {
      "required": ["name"],
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^SYMBOL$"
        },
        "name": {"type": "string"}
      },
      "required": ["type", "name"]
    },

    "seq-rule": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^SEQ$"
        },
        "members": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/rule"
          }
        }
      },
      "required": ["type", "members"]
    },

    "choice-rule": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^CHOICE$"
        },
        "members": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/rule"
          }
        }
      },
      "required": ["type", "members"]
    },

    "repeat-rule": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^REPEAT$"
        },
        "content": {
          "$ref": "#/definitions/rule"
        }
      },
      "required": ["type", "content"]
    },

    "repeat1-rule": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^REPEAT1$"
        },
        "content": {
          "$ref": "#/definitions/rule"
        }
      },
      "required": ["type", "content"]
    },

    "token-rule": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^TOKEN$"
        },
        "content": {
          "$ref": "#/definitions/rule"
        }
      },
      "required": ["type", "content"]
    },

    "error-rule": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^ERROR$"
        },
        "content": {
          "$ref": "#/definitions/rule"
        }
      },
      "required": ["type", "content"]
    },

    "prec-rule": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^PREC$"
        },
        "value": {
          "type": "integer"
        },
        "content": {
          "$ref": "#/definitions/rule"
        }
      },
      "required": ["type", "content", "value"]
    },

    "prec-left-rule": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^PREC_LEFT$"
        },
        "value": {
          "type": "integer"
        },
        "content": {
          "$ref": "#/definitions/rule"
        }
      },
      "required": ["type", "content", "value"]
    },

    "prec-right-rule": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "pattern": "^PREC_RIGHT$"
        },
        "value": {
          "type": "integer"
        },
        "content": {
          "$ref": "#/definitions/rule"
        }
      },
      "required": ["type", "content", "value"]
    },

    "rule": {
      "oneOf": [
        { "$ref": "#/definitions/blank-rule" },
        { "$ref": "#/definitions/string-rule" },
        { "$ref": "#/definitions/pattern-rule" },
        { "$ref": "#/definitions/symbol-rule" },
        { "$ref": "#/definitions/seq-rule" },
        { "$ref": "#/definitions/choice-rule" },
        { "$ref": "#/definitions/repeat1-rule" },
        { "$ref": "#/definitions/repeat-rule" },
        { "$ref": "#/definitions/token-rule" },
        { "$ref": "#/definitions/error-rule" },
        { "$ref": "#/definitions/prec-rule" },
        { "$ref": "#/definitions/prec-left-rule" },
        { "$ref": "#/definitions/prec-right-rule" }
      ]
    }
  }
}