[TxMt] Grammar file help

[Elliot Saba]

Hey guys, I'm trying to write a grammar file for a MATLAB-like language,
and I'm having trouble with the transpose operator. The transpose operator,
represented by the single quote, can be used in a variety of different
situations:


# Transposing a variable:
myMatrix'

# Transposing the result of a function:
myFunc( myMatrix )'

# Transposing the result of a parenthetical:
(myMatrix - 1)'

# Transposing a matrix literal:
[1,2,3]'


The first two forms are not difficult, they can be matched with simple
"match" forms.  However, the parenthetical and matrix literal forms are
more difficult; using begin/end blocks in the pattern matching causes *every
*open parentheses or open square bracket to match, regardless of whether or
not there is a transpose operator matched with the closing parentheses or
square bracket.  Not only does this cause performance issues, this causes
issues with nested operators such as:

([1,2,3]' - [4,5,6]')

Any ideas on how to do this the proper way?  I don't really care about
matching the parentheses or the square brackets; I just care that they are
present. Positive look-behind assertions would work fabulously here, but
they can't be variable-length, so that's a no-go here.

Thanks!
-E
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