Class: Roby::EventConstraints::UnboundTaskPredicate::SingleEvent

Inherits:
UnboundTaskPredicate
  • Object
show all
Defined in:
lib/roby/event_constraints.rb

Overview

Subclass of UnboundTaskPredicate to handle single event generators

This is the class that is e.g. returned by UnboundPredicateSupport#to_unbound_task_predicate

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(event_name, deadline: nil) ⇒ SingleEvent

Returns a new instance of SingleEvent.



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# File 'lib/roby/event_constraints.rb', line 906

def initialize(event_name, deadline: nil)
    @event_name = event_name
    @required_events = [event_name].to_set
    @deadline = deadline
    super()
end

Instance Attribute Details

#event_name ⇒ Object (readonly)

The generator name as a symbol



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# File 'lib/roby/event_constraints.rb', line 901

def event_name
  @event_name
end

#required_events ⇒ Object (readonly)

The set of events required to compute this predicate. This is used by UnboundTaskPredicate#compile



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# File 'lib/roby/event_constraints.rb', line 904

def required_events
  @required_events
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/roby/event_constraints.rb', line 913

def ==(other)
    other.kind_of?(SingleEvent) && other.event_name == event_name
end

#code ⇒ Object

Code generation to create the overall evaluated predicate



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# File 'lib/roby/event_constraints.rb', line 918

def code
    if @deadline
        "task_#{event_name} && ("\
            "task_#{event_name}.time.to_f > #{@deadline.to_f}"\
        ")"
    else
        "!!task_#{event_name}"
    end
end

#explain_false(task) ⇒ Object 



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# File 'lib/roby/event_constraints.rb', line 938

def explain_false(task)
    generator = task.event(event_name)
    Explanation.new(false, self, [generator]) unless generator.emitted?
end

#explain_static(task) ⇒ Object 



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# File 'lib/roby/event_constraints.rb', line 943

def explain_static(task)
    event = task.event(event_name)
    if event.last
        Explanation.new(true, self, [event.last])
    elsif event.unreachable?
        Explanation.new(nil, self, [event])
    end
end

#explain_true(task) ⇒ Object

Returns an Explanation object that explains why self is true. Note that it is valid only if evaluate(task) actually returned true (it will silently return an invalid explanation if evaluate(task) returns false).



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# File 'lib/roby/event_constraints.rb', line 932

def explain_true(task)
    return unless (event = task.event(event_name).last)

    Explanation.new(true, self, [event])
end

#followed_by(event) ⇒ Object 



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# File 'lib/roby/event_constraints.rb', line 969

def followed_by(event)
    FollowedBy.new(self, event.to_unbound_task_predicate)
end

#from_now ⇒ Object 



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# File 'lib/roby/event_constraints.rb', line 961

def from_now
    self.class.new(@event_name, deadline: Time.now)
end

#never ⇒ Object 



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# File 'lib/roby/event_constraints.rb', line 957

def never
    Never.new(self)
end

#not_followed_by(event) ⇒ Object 



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# File 'lib/roby/event_constraints.rb', line 965

def not_followed_by(event)
    NotFollowedBy.new(self, event.to_unbound_task_predicate)
end

#static?(task) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/roby/event_constraints.rb', line 952

def static?(task)
    event = task.event(event_name)
    evaluate(task) || event.unreachable?
end

#to_s ⇒ Object 



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# File 'lib/roby/event_constraints.rb', line 973

def to_s
    "#{event_name}?"
end