getting access to the variable name inside self.method_added

Question

I believe in Ruby, there is a way to access the name of all local variables within a block.

def some_method(param1, param2) p local_variables end

whenever 'some_method' is called, param1, and param2 will be printed out. Not the value! but the variable names.

Now, I would like to achieve the same result but within the self.method_added.

Whenever a method is defined, self.method_added is called. I want to be able to access the names of the local variables of the method being defined inside self.method_added. For example,

def self.method_added(method_name) #prints the variables names of the argument for method method_name end def do_something param1, param2 #crazy stuff end

with the code above, when do_something is created, I would like to have access to the variable name 'param1' and 'param2'

Is there a way to do this?

Take a look at this answer and the other answers to the same question. It doesn't provide a way to get all the local variable names used in a method, but it does allow you to get the parameter names given a method name. — mikej
– mikej, Commented Aug 30, 2011 at 7:48
I want to create a way for subclasses' methods to check the type of its variable based on the name of the variables. so you can say stringName.. it will check that it is a string. — denniss
– denniss, Commented Aug 30, 2011 at 16:27
That's rather against the philosophy of ruby. You should use duck typing to ensure the objects passed into a method do what you want. I highly recommend Avdi Grimm's talk "Confident Code", available here: confreaks.net/videos/614-cascadiaruby2011-confident-code — joshsz
– joshsz, Commented Aug 30, 2011 at 19:12
Yea I am not doing this because I want to follow the philosophy of Ruby. I just wanna see whether I can do it or not. — denniss
– denniss, Commented Aug 30, 2011 at 21:13

fjlj · Accepted Answer · 2011-10-15 21:46:01Z

0

def self.method_added(method_name) p self.instance_method(method_name.to_sym).parameters.collect{|g| g[1]} end

answered Oct 15, 2011 at 21:46

fjlj

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Comments

ayckoster · Accepted Answer · 2011-08-31 00:11:51Z

Depending on your ruby version you might consider ruby2ruby.

See: http://www.slideshare.net/marc_chung/RubyConfRubyDosRuby

It allows you to get an AST (abstract syntax tree) of your code. But last time I checked it worked only with 1.8.

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