594 Code Problems and Changes
Spring 2007, David Matuszek
Here are the current versions of all the relevant files.
First off, I apparently failed to upload a
keyword method. I've
no idea how not.
Secondly, some people (including me) have been having trouble getting the most recent versions. I think the problem is that some browsers don't handle their caches correctly, so that if you have previously downloaded a file, downloading it again just gives you the cached version. If this is what is going on, the solution is (or at least, should be) simply to clear the cache before downloading.
TreeTest are as before. You may have a
version with a
package statement at the top, in which case you
need to put these files in a package named
Trees, or else remove
It really doesn't matter which. There is otherwise no difference. Both versions
should have a
child(int index) method; if not, you have files from a previous
assignment. The addition of this method is the only change.
Token has a
public static final Set KEYWORDS in it. If you have this version,
SyntaxException has never been changed.
Parser should have a
private boolean keyword(String expectedKeyword) method
in it, and
ParserTest should have a
If you have these, you're OK. I've now also made these changes to
Anywhere in your
Parser (and in your
Recognizer, if you
want to go back and make these changes) that you were calling
you should now be calling
keyword(String expectedKeyword); fortunately,
changes like this are easy in Eclipse.