Select opposite nodes currentry selected for Autodesk Maya.

select_opposite.py

import re

from maya.api import OpenMaya as OpenMaya2


def select_opposite():
    # type: () -> None

    y = OpenMaya2.MGlobal.getActiveSelectionList()
    sel_strings = y.getSelectionStrings()

    sel_list = OpenMaya2.MSelectionList()
    for s in sel_strings:
        sel_list.add(swap_l_r_name(s))

    OpenMaya2.MGlobal.setActiveSelectionList(sel_list)


def swap_l_r_name(name):
    # type: (Text) -> Text
    """Returns text replaced right/left.

        >>> swap_l_r_name("hoge_l0_ctl")
        'hoge_r0_ctl'

        >>> swap_l_r_name("hoge_L0_ctl")
        'hoge_R0_ctl'

        >>> swap_l_r_name("Hoge_Left_Ctl")
        'Hoge_Right_Ctl'

        >>> swap_l_r_name("hoge_left_ctl")
        'hoge_right_ctl'

        >>> swap_l_r_name("LeftCtl")
        'RightCtl'

        >>> swap_l_r_name("HogeCtlLeft")
        'HogeCtlRight'

        >>> swap_l_r_name("HogeLeftCtl")  # invalid naming
        'HogeLeftCtl'

    """
    rules = [
        {
            "exp": re.compile("_[RL][0-9]+_|^[RL][0-9]+_|_[RL][0-9]+$|_[RL]_|^[RL]_|_[RL]$"),
            "left": "L",
            "right": "R"
        },
        {
            "exp": re.compile("_[rl][0-9]+_|^[rl][0-9]+_|_[rl][0-9]+$|_[rl]_|^[rl]_|_[rl]$"),
            "left": "l",
            "right": "r"
        },
        {
            "exp": re.compile("_(right|left)_|^(right|left)|(right|left)$"),
            "left": "left",
            "right": "right"
        },
        {
            "exp": re.compile("_(Right|Left)_|^(Right|Left)|(Right|Left)$|_(Right|Left)[A-Z]"),
            "left": "Left",
            "right": "Right"
        },
    ]

    if ":" in name:
        splat = name.split(":")
        namespace, name = ":".join(splat[0:-1]), splat[-1]

    else:
        namespace = None

    for entry in rules:

        exp = entry.get("exp")
        left = entry.get("left")
        right = entry.get("right")

        # shortcuts
        if name == left:
            name = right
            break

        if name == right:
            name = left
            break

        m = re.search(exp, name)
        if m:
            instance = m.group(0)
            if instance.find(right) != -1:
                rep = instance.replace(right, left)
            else:
                rep = instance.replace(left, right)

            name = re.sub(exp, rep, name)
            break

    if namespace:
        name = namespace + ":" + name
    return name