import os
from typing import List, Dict, TypedDict, Optional
import json

class Port(TypedDict):
    kind: str
    name: str
    direction: str
    description: str

class Cell(TypedDict):
    description: str
    file_prefix: str
    library: str
    name: str
    parameters: List[str]
    ports: List[Port]
    type: str
    verilog_name: str
    equation: Optional[str]

Cells = Dict[str, Cell]

def load_cells() -> Cells:
   script_dir = os.path.dirname(os.path.realpath(__file__))
   with open(os.path.join(script_dir, 'cells.json')) as fh:
     return json.load(fh)