dash_utils.py

"""
Created on Tue Nov 28 20:59:55 2017

@author: abhiram haridas (abhiramharidas@gmail.com)
"""

"""
This file is imported in dashboard.py. This provides a set of utility functions used for input verification by the 
main program. When run as a standalone program this serves as linebreak remover tool which takes a file name as input
and returns the file content without line breaks as output. This can be used while inputting HTML field values to the
console application.

Functions generally return two values - error_flag and error_msg. error_flag will be set if there is an error and corresponding error
message will be contained in error_msg

"""

import os.path


#================================================== HELPER FUNCTIONS FOR INPUT VALIDATION ====================================================



def file_exist(file_name):            
    
    error_flag = 0
    error_msg = ""
    
    if (not os.path.isfile(file_name)):
        error_flag = 1
        error_msg = "\nError! The specified file does not exist\n"
        
    return (error_flag,error_msg)


def check_date(date_string):

	error_flag = 0
	error_msg = ""

	dates = date_string.split('/');

	if(len(dates) != 3):
		error_flag = 1;
		error_msg = "\nError! Invalid date string. Please follow the specified format.\n"
		return (error_flag, error_msg)

	t = dates[0];                                                                               # validating day

	try:
		t = int(t)
	except ValueError:
		error_flag = 1;
		error_msg = "\nError! Invalid day in date string provided.\n"
		return (error_flag, error_msg)

	if(t < 1 or t > 31):

		error_flag = 1;
		error_msg = "\nError! Invalid day in date string provided.\n"
		return (error_flag, error_msg)

	t = dates[1]                                                                               # validating month       

	try:
		t = int(t)
	except ValueError:
		error_flag = 1;
		error_msg = "\nError! Invalid month in date string provided.\n"
		return (error_flag, error_msg)

	if(t < 1 or t > 12):

		error_flag = 1;
		error_msg = "\nError! Invalid month in date string provided.\n"
		return (error_flag,error_msg)

	t = dates[2]                                                                               # validating year

	try:
		t = int(t)
	except ValueError:
		error_flag = 1;
		error_msg = "\nError! Invalid month in date string provided.\n"
		return (error_flag, error_msg)

	if(t < 1997 or t > 2100):        # :) :P

		error_flag = 1;
		error_msg = "\nError! Invalid month in date string provided.\n"
		return (error_flag, error_msg)


	return (error_flag, error_msg)                                          # valid date


def check_year(year_str):

	error_flag = 0
	error_msg = ""

	try:
		year = int(year_str)
	except ValueError:
		error_flag = 1
		error_msg = "\nError! Invalid year provided.\n"
		return (error_flag, error_msg)

	if (year < 1997 or year > 2100):

		error_flag = 1;
		error_msg = "\nError! Invalid month in date string provided.\n"

	return (error_flag, error_msg)


def check_name(name_str):


	error_flag = 0
	error_msg = ""

	name = name_str.replace(' ','')

	if not name.isalnum():

		error_flag = 1
		error_msg = "\nError! Name/title should have alphabets and spaces only.\n"

	return (error_flag, error_msg)
	


#========================================== Functions executed when executed as main file ========================================

def remove_linebreaks(file_name):

	error_flag, error_msg = file_exist(file_name)

	if error_flag == 1:
		print error_msg
		return None

	with open(file_name) as myfile:
		data = myfile.read()


	return data.replace('\n','').replace('\r','')


if __name__ == '__main__':
	
	file_name = raw_input("Enter path to file : ")
	data_str = remove_linebreaks(file_name)
	
	if data_str is not None:
		print data_str