Error message and test cleanup

Changes error messages so they make sense both from linter and from cajoler..
And make some test code available to the ancillary tools.
Fix a semicolon warning issue after labeled blocks as in
   foo: {}
Add class=nocode to HTML error snippets so the filename is not prettified.


Submitted @3856

[metaweta, 2009-11-19 23:23:31]

LGTM

http://codereview.appspot.com/157079/diff/1/12
File src/com/google/caja/parser/js/Operation.java (right):

http://codereview.appspot.com/157079/diff/1/12#newcode681
src/com/google/caja/parser/js/Operation.java:681: //long l = (long) n;
remove old code

http://codereview.appspot.com/157079/diff/1/2
File tests/com/google/caja/parser/js/ExpressionTest.java (right):

http://codereview.appspot.com/157079/diff/1/2#newcode216
tests/com/google/caja/parser/js/ExpressionTest.java:216: assertFolded("-2", "-1
^ 1");
Do you do any folding of modular arithmetic expressions?

[DavidSarah, 2009-11-20 05:04:59]

http://codereview.appspot.com/157079/diff/40/1011
File src/com/google/caja/parser/js/Operation.java (right):

http://codereview.appspot.com/157079/diff/40/1011#newcode681
src/com/google/caja/parser/js/Operation.java:681: return (int) n;
I think this is incorrect. ToInt32 in ES and an (int) cast in Java behave
differently for infinities and numbers of magnitude >= 2^31.

http://java.sun.com/docs/books/jls/third_edition/html/conversions.html#25363

http://codereview.appspot.com/157079/diff/40/1011#newcode685
src/com/google/caja/parser/js/Operation.java:685: return ((long) n) &
0xffffffffL;
Also incorrect for infinities and large numbers.

[MikeSamuel, 2009-11-20 07:34:25]

http://codereview.appspot.com/157079/diff/40/1011
File src/com/google/caja/parser/js/Operation.java (right):

http://codereview.appspot.com/157079/diff/40/1011#newcode681
src/com/google/caja/parser/js/Operation.java:681: return (int) n;
Good catch.  I forgot Infinities are treated as integer 0 in ES instead of
Integer.MIN_VALUE and Integer.MAX_VALUE.