Your task is to build an interpreter for a general purpose programming language
of your own design. Your language must support the following features:
The only basic types you need to provide are integer and string and you do
not need to provide methods for coercing one type to another (although you
may find it convenient to do so).
The efficiency of your interpreter is not
as long as you can solve the test problem in a reasonable
amount of time.
Your language also does not need to support reclamation of
memory that is no longer needed.
You are to write your program in a statically-typed, imperative language
such as C, C++, or Java.
Check with me first if you wish to use some other host language.
Your dictionary code must be written in your designer language.
integers and strings
dynamically typed (like Scheme and Python)
dictionaries with worst-case access time (use an AVL tree)
arrays with O(1) access time
convenient means to print to the console
an adequate set of operators
functions as first-class objects
(i.e. functions can be manipulated as in Scheme - e.g. local functions)
(graduate only) delayed evaluation of function arguments
In your DPL,
write an RPN calculator, with operators:
+ * - / ^
calculator should be able to read from a file or from stdin.
However, you may hard-wire examples to show that your calculator
works. Your RPN calculator must use a stack.
If your calculator reads from stdin, your problem makefile
rule (see below) in your makefile should do something like:
cat testProblemInputFile | java MyLang rpn.mylang
You will receive a serious deduction if the
rule in your makefile causes a pause for input.
Extra credit will be given to exceptional implementations.
Your README file should give pertinent details.
[100 points] everything works
[51-99 points] functionality is missing/test program is missing
[50 points] pretty printing
[30 points] recognizing
if you do not, at least, implement a recognizer
for your language, you will fail the course.
if you do not, at least, implement an pretty printer,
you will fail the course.
Submitting the assignment
To submit your designer programming language,
place all your source code,
sample programs, a README detailing how to run and write programs
in your language, and a makefile for building your system
into one directory.
Name the README file README.
Your makefile should respond the command
which builds your processor and to the following commands,
each of which illustrates a feature of your language:
make functionsx # shows that functions are 1st-class
make dictionaryx # shows that you have a log(n) AVL-tree dictionary
The first rule in a pair of rules should print
out the appropriate input program,
while the x rules should execute that program.
In particular, the error rules should show off your parser detecting
three different kinds of syntax errors.
should also respond to the commands:
These commands display the test problem of your implementation
and run the test problem, respectively.
Finally, provide an executable shellscript named dpl that runs a program
Test programs can be named anything.
Note: in the case of recognizing only, only the error rules need
be present in your makefile. In the case of pretty printing only,
the run rules
should run the input program through the pretty printer.
Finally, your makefile
should respond to the command:
This command should remove all compilation artifacts
so that a clean compile can be performed.
Makefiles for graduate students should additionally respond to the commands:
To submit your language interpreter, run the command:
submit proglan lusth dpl