You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/espanso/espanso/src/cli/worker/engine/process/middleware/matcher
    
    the code of the file until where you have to start completion: /*
 * This file is part of espanso.
 *
 * Copyright (C) 2019-2021 Federico Terzi
 *
 * espanso is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * espanso is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with espanso.  If not, see <https://www.gnu.org/licenses/>.
 */

use espanso_engine::{
  event::input::Key,
  process::{MatchResult, MatcherEvent},
};
use espanso_match::regex::RegexMatcherState;
use espanso_match::rolling::matcher::RollingMatcherState;

use enum_as_inner::EnumAsInner;

pub mod convert;
pub mod regex;
pub mod rolling;

#[derive(Clone, EnumAsInner)]
pub enum MatcherState<'a> {
  Rolling(RollingMatcherState<'a, i32>),
  Regex(RegexMatcherState),
}

pub fn convert_to_match_event(event: &MatcherEvent) -> espanso_match::event::Event {
  match event {
    MatcherEvent::Key { key, chars } => espanso_match::event::Event::Key {
      key: convert_to_match_key(key.clone()),
      chars: chars.to_owned(),
    },
    MatcherEvent::VirtualSeparator => espanso_match::event::Event::VirtualSeparator,
  }
}

pub fn convert_to_engine_result(result: espanso_match::MatchResult<i32>) -> MatchResult {
  MatchResult {
    id: result.id,
    trigger: result.trigger,
    left_separator: result.left_separator,
    right_separator: result.right_separator,
    args: result.vars,
  }
}

pub fn convert_to_match_key(key: Key) -> espanso_match::event::Key {
  match key {
    Key::Alt => espanso_match::event::Key::Alt,
    Key::CapsLock => espanso_match::event::Key::CapsLock,
    Key::Control => espanso_match::event::Key::Control,
    Key::Meta => e
    
pub fn convert_to_match_key(key: Key) -> espanso_match::event::Key {
  match key {
    Key::Alt => espanso_match::event::Key::Alt,
    Key::CapsLock => espanso_match::event::Key::CapsLock,
    Key::Control => espanso_match::event::Key::Control,
    Key::Meta => espanso_match::event::Key::Meta,
    Key::NumLock => espanso_match::event::Key::NumLock,
    Key::Shift => espanso_match::event::Key::Shift,
    Key::Enter => espanso_match::event::Key::Enter,
    Key::Tab => espanso_match::event::Key::Tab,
    Key::Space => espanso_match::event::Key::Space,
    Key::ArrowDown => espanso_match::event::Key::ArrowDown,
    Key::ArrowLeft => espanso_match::event::Key::ArrowLeft,
    Key::ArrowRight => espanso_match::event::Key::ArrowRight,
    Key::ArrowUp => espanso_match::event::Key::ArrowUp,
    Key::End => espanso_match::event::Key::End,
    Key::Home => espanso_match::event::Key::Home,
    Key::PageDown => espanso_match::event::Key::PageDown,
    Key::PageUp => espanso_match::event::Key::PageUp,
    Key::Escape => espanso_match::event::Key::Escape,
    Key::Backspace => espanso_match::event::Key::Backspace,
    Key::F1 => espanso_match::event::Key::F1,
    Key::F2 => espanso_match::event::Key::F2,
    Key::F3 => espanso_match::event::Key::F3,
    Key::F4 => espanso_match::event::Key::F4,
    Key::F5 => espanso_match::event::Key::F5,
    Key::F6 => espanso_match::event::Key::F6,
    Key::F7 => espanso_match::event::Key::F7,
    Key::F8 => espanso_match::event::Key::F8,
    Key::F9 => espanso_match::event::Key::F9,
    Key::F10 => espanso_match::event::Key::F10,
    Key::F11 => espanso_match::event::Key::F11,
    Key::F12 => espanso_match::event::Key::F12,
    Key::F13 => espanso_match::event::Key::F13,
    Key::F14 => espanso_match::event::Key::F14,
    Key::F15 => espanso_match::event::Key::F15,
    Key::F16 => espanso_match::event::Key::F16,
    Key::F17 => espanso_match::event::Key::F17,
    Key::F18 => espanso_match::event::Key::F18,
    Key::F19 => espanso_match::event::Key::F19,
    Key::F20 => espanso_match::event::Key::F20,
    Key::Other(_) => espanso_match::event::Key::Other,
    _ => espanso_match::event::Key::Other,
  }
}