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02/09/2019 Assignment 1 Description: Computer Systems (2000_7081 Combined)
https://myuni.adelaide.edu.au/courses/44936/pages/assignment-1-description 1/5
Assignment 1 Description
Weighting and Due Date
Marks for this assignment contribute 5% of the overall course mark.
Marks for functionality will be awarded automatically by the web submission system.
Due dates: Milestone - 11:55pm Tuesday of week 7, Final - 11:55pm Friday of week 7.
Late penalties: For each part, the maximum mark awarded will be reduced by 25% per day / part
day late. If your mark is greater than the maximum, it will be reduced to the maximum.
Core Body of Knowledge (CBOK) Areas: abstraction, design, hardware and software, data and
information, and programming.
Project Description
In this assignment you will implement a tokeniser that with minor changes could be used to complete
variations of projects 6, 7, 8, 10 and 11 in the nand2tetris course. A detailed description of the
requirements are shown below. The exectuable programs, tokens and tokens-context will read
text from standard input and produce a list of tokens in the text on standard output.
Note: you should complete workshop 05 before attempting this assignment.
SVN Repository
You must create a directory in your svn repository named: //cs/assignment1. This
directory must only contain the following files and directories - the web submission system
(https://cs.adelaide.edu.au/services/websubmission) will check this:
Makefile - this file is used by make to compile your tokeniser program - do not modify this file.
Makefile-extras - this file is used by make to compile your tokeniser program - do not modify this
file.
tokens - executable script that will run your compiled tokens program - do not modify this file.
tokens.cpp C++ source file containing the main() function for tokens - do not modify this file.
tokens-context - executable script that will run your compiled tokens-context program - do not
modify this file.
tokens-context.cpp C++ source file containing the main() function for tokens-context - do not
modify this file.
tokeniser.cpp C++ source files containing the next_token() function.
bin - this directory contains precompiled programs and scripts - do not modify this directory.
lib - this directory contains precompiled components - do not modify this directory.
includes - this directory contains .h files for the library - do not modify this directory.
tests - this directory contains sample test data, it can be used to store any extra files you need for
testing
Note: you must use the following command to add your startup files to your svn repository:
% svn add Makefile Makefile-extras bin includes lib tests tokens tokens.cpp tokens-context tokens-co
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02/09/2019 Assignment 1 Description: Computer Systems (2000_7081 Combined)
https://myuni.adelaide.edu.au/courses/44936/pages/assignment-1-description 2/5
pp
ntext.cpp tokeniser.cpp lib/*/lib.a
Submission and Marking Scheme
This assignment has two assignments in the web submission system
(https://cs.adelaide.edu.au/services/websubmission) named: Assignment 1 - Milestone
Submissions and Assignment 1 - Final Submissions. The assessment is based on "Assessment of
Programming Assignments (https://myuni.adelaide.edu.au/courses/44936/pages/assessment-ofprogramming-assignments)
". A submission to either assignment in the web submission system
(https://cs.adelaide.edu.au/services/websubmission) will automatically result in a submission to the other
assignment.
Assignment 1 - Milestone Submissions: due 11:55pm Tuesday of
week 7
The marks awarded by the web submission system (https://cs.adelaide.edu.au/services/websubmission)
for the milestone submission contribute up to 20% of your marks for assignment 1. Your milestone
submission mark, after the application of late penalties, will be posted to the myuni gradebook when the
assignment marking is complete.
Your tokeniser program must be written in C++ and will be tested using the set of test files that are
attached below. Although a wide range of tests may be run, including a number of secret tests, marks
will only be recorded for those tests that test the milestone token definitions shown below using
your tokens program. Your tokens and tokens-context programs will be compiled using the
Makefile and the tokens.cpp or tokens-context.cpp files included in the zip file attached below
together with the tokeniser.cpp file in your svn directory.
Assignment 1 - Final Submissions: due 11:55pm Friday of week 7
The marks awarded for the final submission contribute up to 80% of your marks for assignment 1.
Your final submission mark will be the geometric mean of the marks awarded by the web submission
system (https://cs.adelaide.edu.au/services/websubmission/) , a mark for your logbook and a mark for
your code. It will be limited to 20% more than the marks awarded by the web submission system
(https://cs.adelaide.edu.au/services/websubmission) . See "Assessment - Mark Calculations
(https://myuni.adelaide.edu.au/courses/44936/pages/assessment-mark-calculations) " for examples of how
the marks are combined. Your final submission mark, after the application of late penalties, will be posted
to the myuni gradebook when the assignment marking is complete.
Automatic Marking
The automatic marking will compile and test your tokens and tokens-context programs in exactly the
same way as for the milestone submission. The difference is that marks will be recorded for all of the
tests including the secret tests. Note: if your program fails any of these secret tests you will not receive
any feedback about these secret tests, even if you ask!
Logbook Marking
Important: the logbook must have entries for all work in this assignment, including your milestone
submissions. See "Assessment - Logbook Review
02/09/2019 Assignment 1 Description: Computer Systems (2000_7081 Combined)
https://myuni.adelaide.edu.au/courses/44936/pages/assignment-1-description 3/5
g
(https://myuni.adelaide.edu.au/courses/44936/pages/assessment-logbook-review) " for details of how your
logbook will be assessed.
Code Review Marking
For each of your programming assignments you are expected to submit well written code. See
"Assessment - Code Review (https://myuni.adelaide.edu.au/courses/44936/pages/assessment-codereview)
" for details of how your code will be assessed.
Assignment 1 - Participation Marks
Any submissions to the Final Submissions assignment made more than one week before but less than
two weeks before the due date for the Final Submissions assignment, may be awarded participation
marks. The participation marks will be calculated by scaling the best mark awarded by the automatic
marking of an eligible submission to be a number between 1 and 10. A maximum of 10 participation
marks are available.
Tokenisers
Background
The primary task of any language translator is to work out how the structure and meaning of an input in a
given language so that an appropriate translation can be output in another language. If you think of this
in terms of a natural language such as English. When you attempt to read a sentence you do not spend
your time worrying about what characters there are, how much space is between the letters or where
lines are broken. What you do is consider the words and attempt to derive structure and meaning from
their order and arrangement into English language sentences, paragraphs, sections, chapters etc. In the
same way, when we attempt to write translators from assembly language, virtual machine language or a
programming language into another form, we attempt to focus on things like keywords, identifiers,
operators and logical structures rather than individual characters.
The role of a tokeniser is to take the input text and break it up into tokens (words in natural language) so
that the assembler or compiler using it only needs to concern itself with higher level structure and
meaning. This division of labor is reflected in most programming language definitions in that they usually
have a separate syntax definition for tokens and another for structures formed from the tokens.
The focus of this assignment is writing a tokeniser to recognise tokens that conform to a specific set of
rules. The set of tokens may or may not correspond to a particular language because a tokeniser is a
fairly generic tool. After completing this assignment we will assume that you know how to write a
tokeniser and we will provide you a working tokeniser to use in each of the remaining programming
assignments. This will permit you to take the later assignments much further than would be otherwise
possible in the limited time available.
Writing Your Program
You are required to complete the implementation of the C++ file tokeniser.cpp which is used to compile
the programs tokens and tokens-context. You will complete the implementation of a
function, next_token(), that will read text character by character using the static function nextch(), and
return the next recognised token in the input. The tokens that must be recognised in the milestone and
02/09/2019 Assignment 1 Description: Computer Systems (2000_7081 Combined)
https://myuni.adelaide.edu.au/courses/44936/pages/assignment-1-description 4/5
final submissions are specified below and in the file includes/tokeniser.h.
Your tokens and tokens-context programs will be compiled using the Makefile in the zip file attached
below using the command:
% make
Note: Do not modify the Makefile, tokens.cpp, tokens-context.cpp or the sub-directories
bin, includes and lib. They will be replaced during testing by the web submission system.
Testing Your Program
For each file in the tests directory, the output of the tokens and tokens-context programs must match
the corresponding .tokens and .context output files respectively. You must not produce any output of
your own. You can both compile and test your programs against all of the supplied tests using the
command:
% make
The testing will not show you any program output, just whether or not a test was passed or failed. If you
want to see the actual output, the commands used to run the tests are shown in string quotes ("). Simply
copy the commands between the string quotes (") and paste them into your shell.
The web submission system will test your program in exactly this way. The key difference between your
testing and the web submission testing is that the web submission system has some secret tests that it
will use.
If you want to try additional tests, just create some new files in the tests sub-directory and generate the
correct outputs using the command:
% make test-add
This will increase the number of tests that will be run in the future.
Milestone Tokens 
Your milestone submission will be marked using tests that require the correct recognition of the
tokens, tk_identifier, tk_integer, tk_at, tk_semi, tk_colon, tk_not, tk_comma, tk_stop,
tk_lcb, tk_rcb, tk_lrb, tk_rrb, tk_lsb, tk_rsb and tk_div.
Note: the includes/tokeniser.h file describes
the grammar rules for all tokens,
the rules for preprocessing tab and carriage return characters (not required for the milestone),
the rules for differentiating identifiers and keywords (not required for the milestone),
the rules governing the context of some token spelling's (not required for the milestone) and
the rules governing error handling.
Notes: all input must be read using the function next_ch() which must use the external function read_char().
Final Submission Tokens
Your final submission will be marked using tests that require the correct recognition of the following
02/09/2019 Assignment 1 Description: Computer Systems (2000_7081 Combined)
https://myuni.adelaide.edu.au/courses/44936/pages/assignment-1-description 5/5
tokens in addition to the milestone tokens listed above: tk_eol_comment, tk_adhoc_comment,
tk_float, tk_string, tk_do, tk_for, tk_pointer, tk_real, tk_this, tk_eq and tk_spaceship,
In addition your final submission also has to fully implement the function token_is_in() so that it
recognises the group tokens tk_number, tk_keyword, and tk_symbol.
Finally, your submission has to fully implement the function token_context().
Tests
In addition to the test files in the zip file attached below, we will use a number of secret tests that may
contain illegal characters or character combinations that may defeat your tokenisers. Note: these tests
are secret, if your programs fail any of these secret tests you will not receive any feedback about these
secret tests, even if you ask!
Startup Files
The startup files in the attached zip file should work on most 64-bit Linux systems and on a Mac. Please
see the Startup Files for Workshops and Assignments
(https://myuni.adelaide.edu.au/courses/44936/pages/startup-files-for-workshops-and-assignments) page for
more information.
assignment-tokeniser.zip (https://myuni.adelaide.edu.au/courses/44936/files/5214649/download?
wrap=1)

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