Class: MockSuey::Tracer::TracePointCollector

Inherits:
Object
  • Object
show all
Defined in:
lib/mock_suey/tracer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tracer) ⇒ TracePointCollector

Returns a new instance of TracePointCollector.



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# File 'lib/mock_suey/tracer.rb', line 56

def initialize(tracer)
  @tracer = tracer
end

Instance Attribute Details

#tracer ⇒ Object (readonly)

Returns the value of attribute tracer.



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# File 'lib/mock_suey/tracer.rb', line 54

def tracer
  @tracer
end

Instance Method Details

#setup(targets) ⇒ Object 



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# File 'lib/mock_suey/tracer.rb', line 60

def setup(targets)
  tracer = self.tracer
  calls_stack = []

  @tp = TracePoint.trace(:call, :return) do |tp|
    methods = targets[tp.defined_class]
    next unless methods
    next unless methods.include?(tp.method_id)

    receiver_class, method_name = tp.defined_class, tp.method_id

    if tp.event == :call
      method = tp.self.method(method_name)
      arguments = []
      kwargs = {}

      method.parameters.each do |(type, name)|
        next if name == :** || name == :* || name == :&

        val = tp.binding.local_variable_get(name)

        case type
        when :req, :opt
          arguments << val
        when :keyreq, :key
          kwargs[name] = val
        when :rest
          arguments.concat(val)
        when :keyrest
          kwargs.merge!(val)
        end
      end

      arguments << kwargs unless kwargs.empty?

      call_obj = MethodCall.new(
        receiver_class:,
        method_name:,
        arguments:,
        has_kwargs: !kwargs.empty?,
        metadata: {
          location: method.source_location.first
        }
      )
      tracer << call_obj
      calls_stack << call_obj
    elsif tp.event == :return
      call_obj = calls_stack.pop
      call_obj.return_value = tp.return_value
    end
  end
end

#stop ⇒ Object 



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# File 'lib/mock_suey/tracer.rb', line 113

def stop
  tp.disable
end