arithmetic

#! /usr/bin/python3

import sys
from arithmetic import Parser
from arithmetic import evaluate


if len( sys.argv ) >= 2:
    if sys.argv[1] in [ '-h', '--help' ]:
        print(__doc__)
    elif sys.argv[1] == '-f':
        filename = sys.argv[2]
        text = open( filename ).read()
        parser = Parser()
        print(parser.parse(text))
    else:
        text =  ' '.join( sys.argv[ 1: ] )
        if '=' in text:
            parser = Parser()
            print(parser.parse(text))
        else:
            print(evaluate( text ))
else:
    text = sys.stdin.read()
    lines = text.splitlines()
    if '=' in text or len(lines) > 1:
        parser = Parser()
        print(parser.parse(text))
    else:
        print(evaluate( lines[0] ))