[antlr-interest] Optional tokens

[hammett]

Howdy!

I'm struggling with my grammar where I need to express that SEMI or NEWLINE 
is required to signal the end of my statements while should be totally 
ignored elsewhere.

So, a possible AST could be

NEWLINE
TypeDefinition
NEWLINE
  MethodDefintion
  NEWLINE
    Statements either SEMI or NEWLINE must be used to end each statement
      But NEWLINEs on the code should be ignored

Being concrete

-- --
# a comment (Token.SKIP)

class MyClass

  def self.initialize
    x, y = 1, 2
    puts x, y
  end

end
-- --

Any help would be great!

-- 
Cheers,
hammett
http://www.castleproject.org/~hammett