from collections import Counter
from cppy.cp_util import *
import re

class Pipe:
    def __init__(self, func, *args, **kwargs):
        # print( self, func, *args, **kwargs )
        self.func = func
        self.args = args
        self.kwargs = kwargs

    def __or__(self, other):
        return Pipe(lambda x: self.func(x) or other.func(x))
        # print(self.func.__name__, other.func.__name__ )
        def composed_func():
            print( other.func(self.func(self.args, self.kwargs), other.args, other.kwargs) ) 
            return other.func(self.func(self.args, self.kwargs), other.args, other.kwargs)
        return Pipe(composed_func)

    # def __call__(self, *args, **kwargs):
    #     print( *args, **kwargs )
    #     return self.func(*args, **kwargs)
    def __call__(self, data):        
        return self.func(data)    

def read_file(filename):
    with open(filename, 'r',encoding='utf-8') as f:
        return f.read()

def split_words(text):
    return re.findall(r'\b\w+\b', text.lower())

def count_words(words):
    return Counter(words)

def top_n_words(word_counts, n):
    return word_counts.most_common(n)

# 使用管道
pipe = Pipe(read_file) | Pipe(split_words) | Pipe(count_words) | Pipe(top_n_words, 10)
result = pipe(testfilepath)
print(result)