#
# Book list
#

import book
import string



class Book_List:

    def __init__ (self):
	self.contents = []
    

    def make_from_file (self, file):
	#
	# Read the file and create a book list
	#
	lines = file.readlines ()
	self.contents = []
	#
	# Parse each line and create a list of Book objects
	#
	for one_line in lines:
	    # It's  not a comment or empty line 
	    if (len(one_line) > 0) and (one_line[0] != "#"):
		    # Split into tokens
		    tokens = string.split (one_line)
		    if len (tokens) > 0:
			if (tokens[0] == "time:"):
			    current_book = book.Book (string.join (tokens[1:]))
			    self.contents.append (current_book)
			elif (tokens[0] == "name:"):
			    current_book.set_author (string.join (tokens[1:]))
			elif (tokens[0] == "space:"):
			    current_book.set_subject (string.join (tokens[1:]))
			elif (tokens[0] == "url:"):
			    current_book.set_url (string.join (tokens[1:]))
	
			    
    def sort_by_author (self):
	#
	# Sort book list by author
	#
	def cmp_author (x, y):
	    res = cmp (x.last_name, y.last_name)
	    if res == 0:
			res = cmp (x.first_name, y.first_name)
			if res == 0:
				res = cmp (x.title, y.title)
	    return res

	self.contents.sort (cmp_author)
	

    def sort_by_title (self):
	#
	# Sort book list by title
	#
	self.contents.sort (lambda x, y: cmp (x.title, y.title))




    def sort_by_subject (self):
	#
	# Sort by subject
	#
	def cmp_subject (x, y):
		res = cmp (x.subject, y.subject)
		if res == 0:
			res = cmp (x.title, y.title)
		return res

	self.contents.sort (cmp_subject)


    def display (self):
	#
	# Print the contents of the list
	#
	for b in self.contents:
	    print "-----------------"
	    b.display ()
	print "-----------------"

#
# Code to test this class
#
if (__name__ == "__main__"):
    print "*** testing book_file_parser ****"
    f = open ("books.txt", "r")
    book_list = Book_List ()
    book_list.make_from_file (f)
    book_list.display ()
    book_list.sort_by_author ()
    book_list.display ()
    book_list.sort_by_title ()
    book_list.display ()
    book_list.sort_by_subject ()
    book_list.display ()








    

        
        
        
        
    




	

        
            
        
        

        	
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