[Ironruby-core] Adding methods to Kernel

Curt Hagenlocher curth at microsoft.com
Sun Jul 13 16:47:51 EDT 2008


You need to declare a "self" parameter, even though it will be unused.

From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at rubyforge.org] On Behalf Of Peter Bacon Darwin
Sent: Sunday, July 13, 2008 1:46 PM
To: ironruby-core at rubyforge.org
Subject: [Ironruby-core] Adding methods to Kernel

I am still having problems adding the BigDecimal method into the Kernel module.  As I understand it the correct method is to create a new class that extends Kernel and adds the methods as both Private-Instance and Public-Singleton.  This is the code:

namespace Ruby.StandardLibrary.BigDecimal {
    [RubyModule(Extends = typeof(Kernel))]
    public static class KernelOps {
        [RubyMethod("BigDecimal", RubyMethodAttributes.PrivateInstance)]
        [RubyMethod("BigDecimal", RubyMethodAttributes.PublicSingleton)]
        public static BigDecimal/*!*/ CreateBigDecimal(CodeContext/*!*/ context, [NotNull]MutableString/*!*/ value, [Optional]int n) {
            return BigDecimalOps.CreateBigDecimal(value, n);
        }
        [RubyMethod("BigDecimal", RubyMethodAttributes.PrivateInstance)]
        [RubyMethod("BigDecimal", RubyMethodAttributes.PublicSingleton)]
        public static BigDecimal/*!*/ CreateBigDecimal(CodeContext/*!*/ context, object value, [Optional]int n) {
            return BigDecimalOps.CreateBigDecimal(context, value, n);
        }
    }
}

This appears to create the methods (you can see them in Kernel.methods)  but it is not possible to call them.  You always get an ArgumentError thrown with "incorrect type or number of parameters" as a message.

I have been digging through the code but I can't work out why this is happening.  One thing that seems a little worrying but not necessarily wrong is that it appears that the target (self) has a RubyClass of type Ruby.Builtins. BuiltinsLibraryInitializer, which seems rather bizarre.

Currently I am able to get around this by defining the methods in Ruby itself, I changed the bigdecimal.rb file in the libs folder to:

load_assembly 'IronRuby.Libraries', 'Ruby.StandardLibrary.BigDecimal'
class Object
                def BigDecimal(v, n = 0)
                                BigDecimal.new(v,n)
                end
end

Any ideas?
Pete
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