#!/usr/bin/env python
#
# Copyright (C) 2010, William Trevor King <wking@drexel.edu>
#
# This program 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.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

"""Calculate ASCII character frequencies.
"""

import sys


def read(stream):
    hist = [0]*256
    while True:
        data = stream.read(1024)
        if len(data) == 0:
            break
        for char in data:
            hist[ord(char)] += 1
    return hist

def write(hist, stream=sys.stdout):
    for char,count in enumerate(hist):
        if count != 0:
            print '%02x (%s)\t%d' % (char, chr(char), count)


if __name__ == '__main__':
    try:
        filename = sys.argv[1]
    except IndexError:
        filename = None

    if filename == None:
        hist = read(sys.stdin)
    else:
        with open(filename, 'rb') as f:
            hist = read(f)

    write(hist)