AdventOfCode/fred.py

import re

def list2int(x):
    return list(map(int, x))

def get_re(pattern,str):
    match = re.match(pattern, str)
    if match:
        return match
    return None 

def ppprint(x):
    for idx,i in enumerate(x):
        for jdx,j in enumerate(i):
            print(x[idx][jdx],end='')
        print()

def get_value_in_direction(grid, position, direction=None):
    """
    Get the value in a specified direction from a given position in a grid.
    If no direction is provided, returns the value at the current position.

    Parameters:
        grid (list of list of int/float): The 2D grid.
        position (set): A set containing x (row index) and y (column index) as integers.
        direction (str, optional): The direction to check.
                                   Options: 'up', 'down', 'left', 'right', 
                                            'up-left', 'up-right', 'down-left', 'down-right'.
    
    Returns:
        The value in the grid in the specified direction, or None if out of bounds.
    """
    # Ensure the position is a set of two integers
    if len(position) != 2 or not all(isinstance(coord, int) for coord in position):
        raise ValueError("Position must be a set containing two integers (x, y).")
    
    x, y = position
    offsets = {
        'up': (-1, 0),
        'down': (1, 0),
        'left': (0, -1),
        'right': (0, 1),
        'up-left': (-1, -1),
        'up-right': (-1, 1),
        'down-left': (1, -1),
        'down-right': (1, 1)
    }
    
    # If no direction is given, return the value at the current position
    if direction is None:
        if 0 <= x < len(grid) and 0 <= y < len(grid[x]):
            return grid[x][y]
        else:
            return None

    # Validate direction
    if direction not in offsets:
        raise ValueError(f"Invalid direction: {direction}. Choose from {list(offsets.keys())}")
    
    dx, dy = offsets[direction]
    new_x, new_y = x + dx, y + dy
    
    # Check for out-of-bounds, considering varying row lengths
    if 0 <= new_x < len(grid) and 0 <= new_y < len(grid[new_x]):
        return grid[new_x][new_y]
    else:
        return None