Yapps

* *: Added a test/ directory for test cases; I had previously put
tests in the examples/ directory, which is a bad place to put
them. Examples are useful for learning how Yapps works. Tests
are for testing specific features of Yapps.

* parsetree.py (Plus.update): Fixed a long-standing bug in which
the FOLLOW set of 'a'+ would include 'a'. In theory this makes no
practical difference because the 'a'+ rule eats up all the 'a'
tokens anyway. However, it makes error messages a little bit more
confusing because they imply that an 'a' can follow.

* yappsrt.py (print_error): Incorporated the context object into
the printing of error messages.

2003-08-12 Amit Patel <amitpcs.stanford.edu>

* parsetree.py: Improved error message generation. Instead of
relying on the scanner to produce errors, the parser now checks
things explicitly and produces errors directly. The parser has
better knowledge of the context, so its error messages are more
precise and helpful.

* yapps_grammar.g: Instead of setting self.rule in the setup()
method, pass it in the constructor. To make it available at
construction time, pass it along as another attribute in the
attribute grammar.

2003-08-11 Amit Patel <amitpcs.stanford.edu>

* parsetree.py: Generated parsers now include a context object
that describes the parse rule stack. For example, while parsing
rule A, called from rule B, called from rule D, the context object
will let you reconstruct the path D > B > A. [Thanks David Morley]

* *: Removed all output when things are working
properly; all warnings/errors now go to stderr.

* yapps_grammar.g: Added support for A? meaning an optional A.
This is equivalent to [A].

* yapps2.py: Design - refactored yapps2.py into yapps2.py +
grammar.py + parsetree.py. grammar.py is automatically generated
from grammar.g. Added lots of docstrings.

2003-08-09 Amit Patel <amitpcs.stanford.edu>

* yapps2.py: Documentation - added doctest tests to some of the
set algorithms in class Generator.

* yapps2.py: Style - removed "import *" everywhere.

* yapps2.py: Style - moved to Python 2 -- string methods,
list comprehensions, inline syntax for apply

2003-07-28 Amit Patel <amitpcs.stanford.edu>

* yappsrt.py: Style - replaced raising string exceptions
with raising class exceptions. [Thanks Alex Verstak]

* yappsrt.py: (SyntaxError) Bug fix - SyntaxError.__init__ should
call Exception.__init__

* yapps2.py: Bug fix - identifiers in grammar rules that had
digits in them were not accessible in the {{python code}} sections
of the grammar.

* yapps2.py: Style - changed "b >= a and b < c" to "a <= b < c"

* yapps2.py: Style - change "`expr`" to "repr(expr)"

2002-08-00 Amit Patel <amitpcs.stanford.edu>

* yapps2.py: Bug fix - inline tokens using the r"" syntax weren't
treated properly.

2002-04-00 Amit Patel <amitpcs.stanford.edu>

* yapps2.py: Bug fix - when generating the "else" clause, if the
comment was too long, Yapps was not emitting a newline. [Thanks
Steven Engelhardt]

2001-10-00 Amit Patel <amitpcs.stanford.edu>

* yappsrt.py: (SyntaxError) Style - the exception classes now
inherit from Exception. [Thanks Rich Salz]

* yappsrt.py: (Scanner) Performance - instead of passing the set
of tokens into the scanner at initialization time, we build the
list at compile time. You can still override the default list per
instance of the scanner, but in the common case, we don't have to
rebuild the token list. [Thanks Amaury Forgeot d'Arc]