bug#15594: 24.3; Indentation of method arguments without parentheses in ruby-mode is broken

[Bozhidar Batsov]

On Saturday, October 12, 2013 at 5:37 PM, Stefan Monnier wrote:

In Ruby one can invoke methods with or without parentheses:

some_method(arg1, arg2)

some_method arg1, arg2

Interesting. How is the following parsed, then:

some_method arg1, other_method arg2, arg3, arg4

There are some limitations, of course. Ambiguous cases generally result in parsing errors:

Parser::CurrentRuby.parse('some_method arg1, other_method arg2, arg3, arg4')

(string):1:32: error: unexpected token tIDENTIFIER

some_method arg1, other_method arg2, arg3, arg4

                                                  ^^^^

Parser::SyntaxError: unexpected token tIDENTIFIER 

If we remove arg1, however, there is no ambiguity:

[21] pry(main)> Parser::CurrentRuby.parse('some_method other_method arg2, arg3, arg4')

=> (send nil :some_method

  (send nil :other_method

    (send nil :arg2)

    (send nil :arg3)

    (send nil :arg4)))

-- Stefan