Untitled

import abstract_typestokens_enum = ['global_res_word','context_res_word', 'res_symbol',	'identifier', 'string_type', 'int_type', 'float_type']tokens = abstract_types.enum(tokens_enum)	global_res_words_enum = ['var', 'if', 'while', 'for', 'print']glob_res = abstract_types.enum(global_res_words_enum)context_res_words_enum = ['break', 'next', 'loop', 'else']cont_res = abstract_types.enum(context_res_words_enum)	global_res_symbols_enum = ['+', '-', '*', '/', '(', ')', '^', '%', 'EOF']symb_res = abstract_types.enum(global_res_symbols_enum)	token_type = abstract_types.record()token_type.infile = file('d:/source.bpl', 'r')token_type.cur_str = ""token_type.cur_str_len = 0token_type.cur_line = 0token_type.cur_pos = 0token_type.type_of_token = tokenstoken_type.read_str = ""token_type.cap_str = ""token_type.int_val = 0token_type.float_val = 0.0token_type.glob_res_word = glob_restoken_type.cont_res_word = cont_restoken_type.res_sym = symb_resdef is_delim(char):	if ' ,;'.find(char) <> -1:		return 1	return 0def advance_token(token):	token.cur_str = ""	token.read_str = ""	token.cap_str = ""	while (token.cur_str[token.cur_pos] = " "):		if token.cur_pos > token.cur_str_len:			token.cur_str = token.infile.readline()			token.cur_str_len = len(token.cur_str)			token.cur_pos = 0			if not token.cur_str:				token.type_of_token = 'RESERVED_SYMBOL'				token.res_sym = 'EOF'	read_str_idx = 0