sznurek

nfather :: Person -> Int -> Maybe Person
nfather p n = do
    a <- father p
    b <- father a
    -- ... repeat n times
    father xyz

sznurek

<?php

class First {
    const X = 1;
    const Y = self::X;
}

class Second extends First {
    const X = 2;
}

sznurek

import sys

for line in sys.stdin.readlines():
    parts = line.split()
    uid = int(parts[0])
    msg = ' '.join(parts[1:])

    print("%d Hello user %d! Message: %s" % (uid, uid, msg))

sznurek

# methods on_read and on_write was called when select confirmed that socket is ready to read from / write to

STATE_SEND_LOGIN = 1
STATE_RECEIVE_LOGIN = 2
STATE_SEND_PASS = 3
STATE_RECEIVE_PASS = 4
STATE_SEND_OK = 5

class Authenticator:
    def __init__(self, sock):

sznurek

class Authenticator:
    def __init__(self, sock):
        self.sock = sock
        self.login = None
        self.pass = None
        self.to_send = "LOGIN"
        self.to_read = None

    def on_write(self):
        if self.to_send == "LOGIN":

sznurek

def auth(login, password):
    return login == "1" and password == "test"

login_action = Write('LOGIN') >> \
               Read('login') >> \
               Write('PASS') >> \
               Read('PASS') >> \
               Guard(lambda v: auth(v['login'], v['pass']) >> \
               Write('OK')

sznurek

class FDManager:
    def register_read(self, file_descriptor, callback):
        # ...
    def register_write(self, file_descriptor, callback):
        # ...
    def register_error(self, file_descriptor, callback):
        # ...

sznurek

class SendText(IOBase):
    def __init__(self, fd, text=b"Hello!"):
        self.fd = fd
        self.text = text

    def register(self, fdmanager):
        fdmanager.register_write(self.fs, self.write)

    def write(self):
        os.write(self.fd, self.text)

sznurek

class SendText(IOBase):
    def __init__(self, fd, text=None):
        self.fd = fd
        self.text = text
        if not self.text:
            self.text = lambda: b"Hello!"

    def register(self, fdmanager):
        fdmanager.register_write(self.fs, self.write)

sznurek

login_action = Write('LOGIN') >> \
               Read('login') >> \
               Write(lambda v: 'HELLO %s' % v['login'])