[bitc-dev] why the switch to c++?

[Sam Rushing]

Jonathan S. Shapiro wrote:
> On Wed, Feb 11, 2009 at 4:13 PM, <"jan"rtm443x at gmail.com
> <mailto:rtm443x at gmail.com>> wrote:
>
>     Or just write the new syntax lexer/parser by hand. Not a lot of
>     fun but
>     not too hard if it's a sensible syntax (ie. minimal lookahead).
>
>
> It's currently single token lookahead, but its 174 productions at the
> moment and about to grow. I'm not even going to *try* to maintain that
> by hand, and attempting to do so would make validation harder.
For Irken, I wrote a dfa-based lexer.  Right now I'm planning on just
using a recursive-descent parser, other options I looked at were:

An Earley parser:
ftp://ftp.cs.indiana.edu/pub/scheme-repository/code/lang/earley.scm ...
.. and combinator parsing (chapter 11 of EOPLv1).

The generator stuff I was talking about earlier makes the connection
between the lexer and the parser nice and simple, when the parser needs
another token it just calls the token generator.

-Sam

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