[antlr-interest] ANTLR v2 to v3 converter version 0.1

[Terence Parr]

Hi,

I have an initial v2 to v3 converter:

http://www.antlr.org/v3/v2v3-0.1.tar.gz

It converts two v2 ANTLR grammars from ANTLR v3 (antlr.g and  
antlr.print.g) syntactically, but I get lots of warnings...anyway,  
won't do trees in actions or anything, but it does some decent work  
for you.  Does most of the grunt work I'd say.

$ java v3me file.g

stdout will have the translation.

Use

$ java v3me -combined file.g

if you are converting a file with both parser/lexer in there!

Please send updates to me directly if you make some nice additions. :)

Let me know what you think.

Ter
------------------
Currently does this kind of stuff:

new keywords: grammar, tree; must warn with comment.

convert class T extends Parser -> grammar T if combined or
parser grammar T if not

header {...} -> @header {...} and move to action section after grammar.

option names; importVocab -> tokenVocab, buildAST=true -> output=AST

keyword protected->fragment

labels goes from colon to =

literals "abc" -> 'abc'

tree ^ -> ^^

kill empty strings in tokens; don't need to add to literals table.
tokens {
         "options";
}

add @members to member actions.

add @init to rule actions

comment out return value init expressions

move lexer member action to grammar member area if combined