Cosider to migrate to pegjs 0.9

[physikerwelt]

I tried to migrate to pegjs 0.9, but it seems that the following block

expr
  = ne_expr
  / /* */
  { return ast.LList.EMPTY; }

does not pass validation anymore.

45:3: Expected "!", "$", "&", "(", ".", character class, comment, end of line, identifier, literal or whitespace but "{" found.

Some of the changes from 0.8 to 0.9 seem to be interesting https://github.com/pegjs/pegjs/blob/master/CHANGELOG.md.

[physikerwelt]

I had a look at that. One needs to replace empty tokens with "", change the name of the parse() function.
In addition, I removed the ..h version that were not used since they caused recursion problems.
The last thing I need to do is to update the error reporting. Afterwards I'll make a pull request