Hi,
I'm Carlo, I'm new to MacRuby and I'd like to contribute if possible. I
found this weird bug when requiring modules that define classes that extend
Forwardable and define delgates:
$ echo "require 'csv'; puts 'good'" | macirb
require 'csv'; puts 'good'
NameError: undefined local variable or method `str' for CSV::Row:Class
from 0:in `def_delegator:'
But requiring it from a script works fine:
$ macruby -e "require 'csv'; puts 'good'"
good
Same behavior for rss/parser:
$ echo "require 'rss/parser'; puts 'good'" | macirb
require 'rss/parser'; puts 'good'
NameError: undefined local variable or method `str' for RSS::Parser:Class
from 0:in `def_delegator:'
$ macruby -e "require 'rss/parser'; puts 'good'"
good
I traced it to the def_instance_delegator method in Forwardable:
def def_instance_delegator(accessor, method, ali = method)
str = %Q{
def #{ali}(*args, &block)
#{accessor}.send(:#{method}, *args, &block)
end
}
# If it's not a class or module, it's an instance
begin
module_eval(str)
rescue
instance_eval(str)
end
end
I found that if I just hard code the str value as the parameters to
module_eval and instance_eval, it works:
def def_instance_delegator(accessor, method, ali = method)
# If it's not a class or module, it's an instance
begin
module_eval(%Q{ def #{ali}(*args, &block)
#{accessor}.send(:#{method}, *args, &block)
end
})
rescue
instance_eval(%Q{ def #{ali}(*args, &block)
#{accessor}.send(:#{method}, *args, &block)
end
})
end
end
This is kind of hack, so I'm assuming the root cause has to do with how
macirb treats variable scope? Is this a known bug? Can I help somehow?
--
.Carlo
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