Is there a way to use reflection or some other method to return the names of
the parameters a method uses? I know that 'arity' will return the number of
parameters, but I'm looking for the names of them.
Thanks in advance,
Charlie
No. Why do you need this?
Ryan
···
On 11/14/05, Charlie Squires <mercury542@yahoo.com> wrote:
Is there a way to use reflection or some other method to return the names of
the parameters a method uses?
If you can get the binding from the start of the method you can look at
#local_variables.
T.
Actually, ParseTree can give you this information.
http://rubyforge.org/projects/parsetree
···
On Nov 14, 2005, at 1:48 PM, Ryan Leavengood wrote:
On 11/14/05, Charlie Squires <mercury542@yahoo.com> wrote:
Is there a way to use reflection or some other method to return the names of
the parameters a method uses?No. Why do you need this?
--
Eric Hodel - drbrain@segment7.net - http://segment7.net
FEC2 57F1 D465 EB15 5D6E 7C11 332A 551C 796C 9F04
Trans wrote:
If you can get the binding from the start of the method you can look
at #local_variables.
IMHO you can't do that without changing the method. Charlie asked for a
solution using reflection so I think this is not an option for him.
Kind regards
robert
Thanks for the feedback. I need a way to do this without changing the method
itself. I'm trying to get an external program a list of parameters from a
Ruby source file. I suppose I could write a parse script.
"Robert Klemme" <bob.news@gmx.net> wrote in message
news:3tu0n5Fum4erU1@individual.net...
···
Trans wrote:
If you can get the binding from the start of the method you can look
at #local_variables.IMHO you can't do that without changing the method. Charlie asked for a
solution using reflection so I think this is not an option for him.Kind regards
robert
In that case use ParseTree like Eric suggested. Here is something that
probably does about what you want (sorry if I ruined your fun, but
this seemed like an interesting problem):
require 'enumerator'
require 'parse_tree'
class MethodParams
attr_reader :parsed, :methods
def initialize(klass)
@parsed = ParseTree.new.parse_tree(klass)
@methods = {}
@parsed[0].select {|i| i.respond_to?(:) and i[0] == :defn}.each do |i|
if i[2][0] == :scope
@methods[i[1]] = i[2][1][1][1..-1]
end
end
end
end
if $0 == __FILE__
if ARGV.length < 1
puts "Usage: #$0 <files to analyze>"
exit(1)
end
class_list = ObjectSpace.enum_for(:each_object, Class).to_a
ARGV.each do |file|
require file
end
new_classes = ObjectSpace.enum_for(:each_object, Class).to_a - class_list
new_classes.each do |klass|
m = MethodParams.new(klass)
m.methods.keys.each do |method|
puts "The parameters for #{klass}##{method} are
#{m.methods[method].join(',')}"
end
end
end
__END__
Depending on your platform, you may have trouble with RubyInline and
ParseTree. I had to do some hackery on my Windows laptop to get the
above to work. Note that the above will only show the parameters of
instance methods on classes inside the required files.
Ryan
···
On 11/16/05, Charlie Squires <mercury542@yahoo.com> wrote:
Thanks for the feedback. I need a way to do this without changing the method
itself. I'm trying to get an external program a list of parameters from a
Ruby source file. I suppose I could write a parse script.
RDoc parses this info too, maybe you could dig around in RDoc and see
how they do it?
Charlie Squires wrote:
···
Thanks for the feedback. I need a way to do this without changing the method
itself. I'm trying to get an external program a list of parameters from a
Ruby source file. I suppose I could write a parse script."Robert Klemme" <bob.news@gmx.net> wrote in message
news:3tu0n5Fum4erU1@individual.net...
> Trans wrote:
>> If you can get the binding from the start of the method you can look
>> at #local_variables.
>
> IMHO you can't do that without changing the method. Charlie asked for a
> solution using reflection so I think this is not an option for him.
>
> Kind regards
>
> robert
>