Used in mapping controller arguments to the params hash. NOTE: You must have the ‘ruby2ruby’ gem installed for this to work.
# In PostsController def show(id) #=> id is the same as params[:id]
![[+]](./images/find.png "show/hide quicksearch"){kind=small}
# File lib/merb-action-args/jruby_args.rb, line 25
25: def build_args(args_node)
26: args = []
27: required = []
28: optional = []
29:
30: # required args
31: if (args_node.args && args_node.args.size > 0)
32: required = args_node.args.child_nodes.map { |arg| [arg.name.to_s.intern] }
33: end
34:
35: # optional args
36: if (args_node.opt_args && args_node.opt_args.size > 0)
37: optional = args_node.opt_args.child_nodes.map do |arg|
38: name = arg.name.to_s.intern
39: value_node = arg.value_node
40: case value_node
41: when org.jruby.ast::FixnumNode
42: value = value_node.value
43: when org.jruby.ast::SymbolNode
44: value = value_node.get_symbol(JRuby.runtime)
45: when org.jruby.ast::StrNode
46: value = value_node.value
47: else
48: value = nil
49: end
50: [name, value]
51: end
52: end
53:
54: args = required + optional
55: return [args, optional.map{|name,| name}]
56: end
# File lib/merb-action-args/jruby_args.rb, line 7
7: def get_args
8: real_method = JRuby.reference(self)
9:
10: # hack to expose a protected field; could be improved in 1.1.5
11: method_field = org.jruby.RubyMethod.java_class.declared_field(:method)
12:
13: method_field.accessible = true
14:
15: dyn_method = method_field.value(real_method)
16:
17: case dyn_method
18: when Methods.MethodArgs
19: return build_args(dyn_method.args_node)
20: else
21: raise "Can't get args from method: #{self}"
22: end
23: end
# File lib/merb-action-args/vm_args.rb, line 8
8: def get_args
9: unless respond_to?(:parameters)
10: raise NotImplementedError, "Ruby #{RUBY_VERSION} doesn't support #{self.class}#parameters"
11: end
12:
13: required = []
14: optional = []
15:
16: parameters.each do |(type, name)|
17: if type == :opt
18: required << [name, nil]
19: optional << name
20: else
21: required << [name]
22: end
23: end
24:
25: return [required, optional]
26: end
| Array | Method arguments and their default values. |
class Example
def hello(one,two="two",three)
end
def goodbye
end
end
Example.instance_method(:hello).get_args
#=> [[:one], [:two, "two"], [:three, "three"]]
Example.instance_method(:goodbye).get_args #=> nil
# File lib/merb-action-args/mri_args.rb, line 82
82: def get_args
83: klass, meth = self.to_s.split(/ /).to_a[1][0..2].split("#")
84: # Remove stupidity for #<Method: Class(Object)#foo>
85: klass = $` if klass =~ /\(/
86: ParseTreeArray.translate(Object.full_const_get(klass), meth).get_args
87: end
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