Module: GetArgs

Included in:
Method, UnboundMethod
Defined in:
lib/mri_args.rb,
lib/vm_args.rb,
lib/get_args.rb,
lib/jruby_args.rb,
lib/argument_list.rb

Overview

Used in mapping controller arguments to the params hash. NOTE: You must have the ‘ruby2ruby’ gem installed for this to work.

Examples

# In PostsController
def show(id)  #=> id is the same as params[:id]

Defined Under Namespace

Classes: Argument, ArgumentList

Constant Summary collapse

Methods = 
org.jruby.internal.runtime.methods

Instance Method Summary collapse

Instance Method Details

#build_args(args_node) ⇒ Object 



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# File 'lib/jruby_args.rb', line 25

def build_args(args_node)
  args = []
  required = []
  optional = []

  # required args
  if (args_node.args && args_node.args.size > 0)
    required << args_node.args.child_nodes.map { |arg| [arg.name.to_s.intern] }
  end
  
  # optional args
  if (args_node.opt_args && args_node.opt_args.size > 0)
    optional << args_node.opt_args.child_nodes.map do |arg|
      name = arg.name.to_s.intern
      value_node = arg.value_node
      case value_node
      when org.jruby.ast::FixnumNode
        value = value_node.value
      when org.jruby.ast::SymbolNode
        value = value_node.get_symbol(JRuby.runtime)
      when org.jruby.ast::StrNode
        value = value_node.value
      else
        value = nil
      end
      [name, value]
    end
  end

  first_args = required.first
  optional.first.each {|arg| first_args << arg} if optional.first
  
  args = [first_args]
  
  rest = args_node.rest_arg_node
  args << (rest ? rest.name.to_s.intern : nil)
  
  block = args_node.block_arg_node
  args << (block ? block.name.to_s.intern : nil)

  args
end

#get_args ⇒ Object

Returns

Array

Method arguments and their default values.

Examples

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



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# File 'lib/mri_args.rb', line 82

def get_args
  unless respond_to?(:parameters)
    raise NotImplementedError, "Ruby #{RUBY_VERSION} doesn't support #{self.class}#parameters"
  end

  required = []
  optional = []

  parameters.each do |(type, name)|
    if type == :opt
      required << [name, nil]
      optional << name
    else
      required << [name]
    end
  end

  return [required, optional]
end

#get_argument_list ⇒ Object 



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# File 'lib/get_args.rb', line 15

def get_argument_list
  ArgumentList.new(get_args.first)
end