creating a DSL: adding random methods

[dc]

hi -

I'm trying to create a simple DSL, using method missing.

i want to be able to add different event logic for different
instances, defined in their own files.
trivial example:

# eg in fred.rb
event :say do
"hi this is fred!"
end

# and joe.rb
event :say do
"joe doesnt say much"
end


so i have a class to implement/create the DSL methods:

def event evt, &block
puts "event: #{evt} , #{event}"
str = "
def #{evt}
#{block}
end
"
puts str
self.class.class_eval(str)
end


after loading the individual fred.rb file in
class Brain
def self.load(filename)
dsl = new
dsl.instance_eval(File.read(filename))
end

then when the event XX do is encountered, i am getting:

ArgumentError: ./parser.rb:37:in ‘event’: wrong number of arguments (0
for 1)

# this is the method call
event :say do
puts ".code here.."
end

# calling this
def event evt, &block


i was expecting "say" to be passed as the evt (method name) and block
to be the code block after do.
perhaps i need to yield something back to the caller?

appreciate any tips on this!

/dc

 

[Tom Link]

Basically, I only wanted to say that your subject line sounded very
promising.

  def event evt, &block
    puts "event: #{evt} , #{event}"

What does this #{event} refer to?

Regards,
Thomas

 

[Shawn Anderson]

[Note: parts of this message were removed to make it a legal post.]

Based on what I'm seeing here, it looks as though you may want something
like the publisher library.

http://atomicobjectrb.rubyforge.org/publisher/

Not quite sure how to answer your question though. HTH
/Shawn