Grading for Project 3

15-212, Spring 1998

The grades for the parser will be out of 100, with 70 points given for correctness and 30 for style.

Correctness

We will perform the following test of your code:

Compile to java bytecode via javac Proj3.java.
Feed some syntactically incorrect SL programs to your parser via java Proj3 < bad.sl, and make sure that the parser behaves appropriately.
Feed some syntactically correct SL programs to your parser via java Proj3 < good.sl, and make sure that the parser outputs the appropriately bracketed parse tree. See the web page for examples of SL programs and their parse trees for examples.

For your benefit, here are some common failure modes to check for. The list is just off the top of my head, and certainly not comprehensive:

An SL program which is not terminated by a newline (the original lexer solution set botched this, but it's been fixed.)
Invalid syntax: things like let 23=24
Empty parameter list: function foobar()...let x=call foobar()
Parse tree output which is inconsistent with those given as examples on the course web page.

Obviously, there are lots of others, and the course staff reserves the right to assign 0/70 correctness points to any project which does not pass the above tests or similar ones.

Style

This will be much more subjective. To see what the staff may deduct points for, see proj2-grading.html.