Class: TracePoint

Inherits:
Object show all
Defined in:
opal/opal/corelib/trace_point.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(event, &block) ⇒ TracePoint

Returns a new instance of TracePoint.



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# File 'opal/opal/corelib/trace_point.rb', line 10

def initialize(event, &block)
  ::Kernel.raise 'Only the :class event is supported' unless event == :class
  @event = event
  @block = block
  @trace_object = nil
  @trace_evt = "trace_#{@event}"
  @tracers_for_evt = "tracers_for_#{@event}"
end

Instance Attribute Details

#event ⇒ Object (readonly)

Returns the value of attribute event.



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# File 'opal/opal/corelib/trace_point.rb', line 8

def event
  @event
end

Class Method Details

.trace(event, &block) ⇒ Object

partial implementation of TracePoint for the moment only supports the :class event



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# File 'opal/opal/corelib/trace_point.rb', line 4

def self.trace(event, &block)
  new(event, &block).enable
end

Instance Method Details

#disable ⇒ Object 



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# File 'opal/opal/corelib/trace_point.rb', line 36

def disable
  %x{
    var idx = Opal[#{@tracers_for_evt}].indexOf(self)

    if (idx > -1) {
      Opal[#{@tracers_for_evt}].splice(idx, 1);

      if (Opal[#{@tracers_for_evt}].length === 0) {
        Opal[#{@trace_evt}] = false;
      }

      return true;
    } else {
      return false;
    }
  }
end

#enable(*args, &enable_block) ⇒ Object 



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# File 'opal/opal/corelib/trace_point.rb', line 19

def enable(*args, &enable_block)
  previous_state = enabled?
  %x{
    Opal[#{@tracers_for_evt}].push(self);
    Opal[#{@trace_evt}] = true;
  }
  if block_given?
    yield
    disable
  end
  previous_state
end

#enabled? ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/trace_point.rb', line 32

def enabled?
  `Opal[#{@trace_evt}] && Opal[#{@tracers_for_evt}].includes(self)`
end

#self ⇒ Object 



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# File 'opal/opal/corelib/trace_point.rb', line 54

def self
  @trace_object
end