[Rubygrammar-grammarians] Ruby Grammar Project

[MenTaLguY]

On Fri, 2005-11-25 at 15:19 -0800, Terence Parr wrote:
> Kewl.  If I knew ruby syntax, we'd be done with the grammar now. : 
> (  I just finished my first script to build and test my v3 ANTLR  
> examples.  Works great!  Amazing...Java collections seem so bare in  
> comparison now.  Back to closure blocks...oh smalltalk how I missed  
> you! ;))

Ah, you're just scratching the surface.  I'll warn you -- from here on
it can get addictive. :)

> If I had a canonical list of constructs including tricky examples, it  
> would really help.

Hmm, I'm hoping some of the grammarian-newcomers can help out with that,
but to start off here are some bits with method calls:

First:

 foo bar baz

(where foo and bar are method names) parses the same as:

 foo( bar( baz ) )

Note that omitting the parenthesis for more than one function in the
"stack" is deprecated, however.

Next:

 def foo
   zort = 3 # assign to variable
   blah = zort # assign to variable from variable
   ...
 end

versus:

 def foo
   blah = zort # assign to variable from method result
   zort = 3 # assign to variable
   ...
 end

I am not sure that 'blah = zort' is parsed differently in these cases,
however; that subtree may look the same in the AST and simply get
interpreted differently.

Next:

 foo 1, 2, 3 # ok
 foo(1, 2, 3) # ok
 bar(1, 2, 3) { ... } # ok
 bar 1, 2, 3 { ... } # parse error
 bar 1, 2, baz { ... } # parses as bar(1, 2, baz { ... })

-mental
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