[antlr-interest] PHP AST Grammar

[Darien Hager]

On 3/11/08, Adam Cooney <ad_cooney at hotmail.com> wrote:
>
> Hey,
> I've been searching for a grammar for PHP that can build ASTs and so far
> have come up with nothing for ANTLR (in fact, nothing at all related to
> PHP). However, I did find a program called PHC which contains a php grammar
> I am thinking of attempting to convert to ANTLR, but was wondering if anyone
> has attempted to build a PHP AST grammar before or has a PHP grammar.
>

Depending on what you're trying to do with your ASTs, I'd like to recommend
you at least take a look at PHP's built-in lexer/tokenizer extension. I've
found it useful for things like disallowing dangerous code in eval()
statements (don't ask, yes, eval() is actually evil() )

http://us.php.net/manual/en/ref.tokenizer.php

Mind you, this is only a tokenizer, but it means you don't need to
reimplement all the possible quoting, comments, whitespace, and HEREDOC
rules. There are some wrinkles (you need to do lookahead for a parenthesis
to figure out if something is a function call or not.)

You can't directly integrate it with ANTLR--that'd have to be some custom
project for a particular rntime...Hmmm... A custom token
stream in Java which can deserialize those tokens (e.g. from JSON) for
use with an ANTLR parser...

-- 
Darien Hager
Developer
Etelos, Inc.
darien at etelos.com

http://www.etelos.com
"Revolutionizing the way applications are developed, distributed and
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