text: import inspect
  import pickle
  import re
  import sqlite3 as sqlite
  import threading
  from collections.abc import MutableMapping
  from contextlib import contextmanager
  from functools import wraps
  
  
  def typecasted(func):
      """Decorator that converts arguments via annotations."""
      signature = inspect.signature(func).parameters.items()
  
      @wraps(func)
      def wrapper(*args, **kwargs):
          args = list(args)
          new_args = []
          new_kwargs = {}
          for _, param in signature:
              converter = param.annotation
              if converter is inspect._empty:
                  converter = lambda a: a  # do nothing
              if param.kind is param.POSITIONAL_OR_KEYWORD:
                  if args:
                      to_conv = args.pop(0)
                      new_args.append(converter(to_conv))
              elif param.kind is param.VAR_POSITIONAL:
                  for a in args:
                      new_args.append(converter(a))
              else:
                  for k, v in kwargs.items():
                      nk, nv = converter(k, v)
                      new_kwargs[nk] = nv
          return func(*new_args, **new_kwargs)
      return wrapper
  
  
  BASE = (
      'keys', 'exclude', 'max',
      'timeout', 'page', 'type'
  )
  
  
  def clansearch(k, v):
      valid = (
          'name', 'score',
          'minMembers', 'maxMembers'
      )
      valid += BASE
      k = _to_camel_case(k)
      if k not in valid:
          raise ValueError('Invalid search parameter passed: {}'.format(k))
      return k, v
  
  
  def keys(k, v):
      k = _to_camel_case(k)
      if k not in BASE:
          raise ValueError('Invalid url parameter passed: {}'.format(k))
      return k, ','.join(v) if isinstance(v, (list, tuple)) else v
  
  
  def tournamentfilter(k, v):
      valid = (
          '1k', 'open', 'full', 'inprep', 'joinable'
      )
      valid += BASE
      k = _to_camel_case(k)
      if k not in valid:
          raise ValueError('Invalid url parameter passed: {}'.format(k))
      return k, ','.join(v) if isinstance(v, (list, tuple)) else v
  
  
  def crtag(tag):
      tag = tag.strip('#').upper().replace('O', '0')
      allowed = '0289PYLQGRJCUV'
      bad = []
      for c in tag:
          if c not in allowed:
              bad.append(c)
      if bad:
          raise ValueError('Invalid tag characters passed: {}'.format(', '.join(bad)))
      if len(tag[3:]) < 3:
          raise ValueError('Tag ({}) too short, length {}, expected 3'.format(tag[3:], len(tag[3:])))
      return tag
  
  
  first_cap_re = re.compile('(.)([A-Z][a-z]+)')
  all_cap_re = re.compile('([a-z0-9])([A-Z])')
  
  
  def _to_snake_case(name):
      s1 = first_cap_re.sub(r'\1_\2', name)
      return all_cap_re.sub(r'\1_\2', s1).lower()
  
  
  def _to_camel_case(snake):
      parts = snake.split('_')
      return parts[0] + "".join(x.title() for x in parts[1:])
  
  
  class API:
      def __init__(self, url):
          self.BASE = url
          self.PLAYER = self.BASE + '/player'
          self.CLAN = self.BASE + '/clan'
          self.TOURNAMENT = self.BASE + '/tournaments'
          self.TOP = self.BASE + '/top'
          self.POPULAR = self.BASE + '/popular'
          self.CONSTANTS = self.BASE + '/constants'
          self.ENDPOINTS = self.BASE + '/endpoints'
          self.VERSION = self.BASE + '/version'
  
  
  class SqliteDict(MutableMapping):
      def __init__(self, filename, table_name='data', fast_save=False, **options):
          self.filename = filename
          self.table_name = table_name
          self.fast_save = fast_save
          self.can_commit = True
          self._bulk_commit = False
          self._pending_connection = None
          self._lock = threading.RLock()
          with self.connection() as con:
              con.execute("create table if not exists `%s` (key PRIMARY KEY, value)" % self.table_name)
  
      @contextmanager
      def connection(self, commit_on_success=False):
          with self._lock:
              if self._bulk_commit:
                  if self._pending_connection is None:
                      self._pending_connection = sqlite.connect(self.filename)
                  con = self._pending_connection
              else:
                  con = sqlite.connect(self.filename)
              try:
                  if self.fast_save:
                      con.execute("PRAGMA synchronous = 0;")
                  yield con
                  if commit_on_success and self.can_commit:
                      con.commit()
              finally:
                  if not self._bulk_commit:
                      con.close()
  
      def commit(self, force=False):
          if force or self.can_commit:
              if self._pending_connection is not None:
                  self._pending_connection.commit()
  
      @contextmanager
      def bulk_commit(self):
          self._bulk_commit = True
          self.can_commit = False
          try:
              yield
              self.commit(True)
          finally:
              self._bulk_commit = False
              self.can_commit = True
              if self._pending_connection is not None:
                  self._pending_connection.close()
                  self._pending_connection = None
  
      def __getitem__(self, key):
          with self.connection() as con:
              row = con.execute("select value from `%s` where key=?" %
                                self.table_name, (key,)).fetchone()
              if not row:
                  raise KeyError
              return pickle.loads(row[0])
  
      def __setitem__(self, key, item):
          with self.connection(True) as con:
              con.execute("insert or replace into `%s` (key,value) values (?,?)" %
                          self.table_name, (key, pickle.dumps(item)))
  
      def __delitem__(self, key):
          with self.connection(True) as con:
              cur = con.execute("delete from `%s` where key=?" %
                                self.table_name, (key,))
              if not cur.rowcount:
                  raise KeyError
  
      def __iter__(self):
          with self.connection() as con:
              for row in con.execute("select key from `%s`" % self.table_name):
                  yield row[0]
  
      def __len__(self):
          with self.connection() as con:
              return con.execute("select count(key) from `%s`" %
                                 self.table_name).fetchone()[0]
  
      def clear(self):
          with self.connection(True) as con:
              con.execute("drop table `%s`" % self.table_name)
              con.execute("create table `%s` (key PRIMARY KEY, value)" %
                          self.table_name)
  
      def __str__(self):
          return str(dict(self.items()))
  