npp_settings/plugins/config/PythonScript/scripts/snake_camel_toggle.py

import re
from Npp import editor
snake = re.compile('([a-z\\d]+_)+[a-z_\\d]+')
camel = re.compile('((?<![A-Z])[a-zA-Z][a-z]*|\\d+)+')
camel_split = re.compile('((?<![A-Z])[a-zA-Z][a-z]*|\\d+)')
def toggle(text,pascal = False):
    if snake.match(text):
        groups = text.split('_')
        ret_s = groups[0]
        if pascal:
            ret_s = ret_s.capitalize()
        for group in groups[1:]:
            ret_s += group.capitalize()
    elif camel.match(text):
        groups = camel_split.findall(text)
        ret_s = '_'.join(group.lower() for group in groups)
    return ret_s
if __name__ == "__main__":
    start = editor.getSelectionStart()
    content = editor.getSelText()
    pascal = 'P256' in content
    replace_all = 'R256' in content
    if pascal:
        content = content.replace('P256','')
        
    if replace_all:
        content = content.replace('R256','')
        editor.replaceSel(content)
        start += 2
    result = toggle(content,pascal)
    if replace_all:
        editor.replace(content,result)
    else:
        editor.replaceSel(result)
    editor.setSelectionStart(start)
    editor.setSelectionEnd(start + len(result))