What a Ruby parser would you suggest to parse Ruby sources?

Question

A parser I'm looking for should:

• be Ruby parsing friendly,
• be elegant by rule design,
• produce user friendly parsing errors,
• user documentation should be available in volume more than a calculator example,
• UPD: allowing to omit optional whitespaces writing a grammar.

Fast parsing is not an important feature.

I tried Citrus but the lack of documentation and need to specify every space in rules just turned me away from it.

Answer 1

• Treetop
• Ragel

Or in case you want to parse Ruby itself:

parse_tree and ruby_parser

Edit:

I just saw your last comment about needing a subset of Ruby for your project, in that case I'd also recommend having a look at tinyrb.