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invocation

Extract information about a method's invocation including the method name, parameter names, and parameter values

Example

class Example
  def some_method(some_parameter, some_other_parameter)
    Invocation.build(binding)
  end
end

subject = Example.new
invocation = subject.some_method(11, 111)

invocation.method_name
# => :some_method

invocation.parameters[:some_parameter]
# => 11

invocation.parameters[:some_other_parameter]
# => 111

All Parameter Types and Combinations

A method signature with positional parameters, named parameters, splat parameters, double splat parameters, and block arguments works no differently than a method signature with simple positional parameters.

def some_method(some_parameter, *parameters, some_other_parameter:, **named_parameters, &blk)
  ::Invocation.build(binding)
end

The Invocation Data Structure

The Invocation data structure captures information about a method invocation, including the method name, the parameter names, and their values.

It has two attributes:

  • method_name
  • parameters

The parameters attribute is a hash of the form parameter_name => parameter_value.

Uses

The Invocation library is used by the Mimic library when a mimic object has method recording activated. When a mimic records an invocation of a method on a mimic, it is recorded as an instance of Invocation.

License

The invocation library is released under the MIT License.

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