MacRuby not finding a method that Ruby is

8 Oct 2009

      Hi,

I'm attempting to use the RParsec gem under MacRuby, but am getting a  
NoMethodError when it loads.  I've create a test file that simply adds  
my local gem directory to the front of the library search path and  
then calls "require 'rparsec'".  This file runs fine under Ruby 1.9,  
but produces the following error when called from MacRuby 0.4.

/Users/ehynes/Test/Gems/rparsec/parser.rb:32:in `block in init':  
super: no superclass method `initialize:' for  
RParsec::ValueParser:RParsec::ValueParser (NoMethodError)
	from /Users/ehynes/Test/Gems/rparsec/parsers.rb:621:in `new'
	from /Users/ehynes/Test/Gems/rparsec/parsers.rb:621:in  
`<module:RParsec>'
	from /Users/ehynes/Test/Gems/rparsec/parsers.rb:3:in `<top (required)>'
	from /Users/ehynes/Test/Gems/rparsec.rb:3:in `require'
	from /Users/ehynes/Test/Gems/rparsec.rb:3:in `block in <top  
(required)>'
	from /Users/ehynes/Test/Gems/rparsec.rb:2:in `each'
	from /Users/ehynes/Test/Gems/rparsec.rb:2:in `<top (required)>'
	from AbcParser.rb:2:in `require'
	from AbcParser.rb:2:in `<main>'

The method with the error in the Parser class is:

   def self.init(*vars)
     parser_checker = {}
     vars.each_with_index do |var, i|
       name = var.to_s
       parser_checker[i] = var if name.include?('parser') && ! 
name.include?('parsers')
     end
     define_method(:initialize) do |*params|
--->  super()   # <--- line 32
       vars.each_with_index do |var, i|
         param = params[i]
         if parser_checker.include? i
           TypeChecker.check_arg_type Parser, param, self, i
         end
         instance_variable_set("@"+var.to_s, param)
       end
     end
   end

Any ideas as to why Ruby can call super in the above method, but  
MacRuby can't?  Is there a fix or workaround that I could use?  An  
alternate parser?

Thanks,
Ed

P.S.  I did have to change one line in the RParsec parser.rb file to  
get it to run under Ruby 1.9, replacing a ':' with a 'then' in a case  
statement.

	$ diff parser_original.rb parser.rb
	881c881
	<     case c when String: c[0] else c end
	---
	>     case c when String then c[0] else c end  # ':' replaced with  
'then'

Edward Hynes

Matt Aimonetti

Edward Hynes

Laurent Sansonetti

Edward Hynes

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