class Roby::EventConstraints::UnboundTaskPredicate::FollowedBy

Representation of UnboundPredicateSupport#followed_by

See documentation from UnboundTaskPredicate

Public Instance Methods

code() click to toggle source
# File lib/roby/event_constraints.rb, line 689
def code
    this_event  = predicates[0].event_name
    other_event = predicates[1].event_name
    "(task_#{this_event} && task_#{other_event} && task_#{other_event}.time > task_#{this_event}.time)"
end
explain_false(task) click to toggle source
# File lib/roby/event_constraints.rb, line 649
def explain_false(task)
    return if evaluate(task)

    this_generator  = task.event(predicates[0].event_name)
    other_generator = task.event(predicates[1].event_name)
    if !this_generator.last
        Explanation.new(false, self, [this_generator])
    else
        Explanation.new(false, self, [other_generator])
    end
end
explain_static(task) click to toggle source
# File lib/roby/event_constraints.rb, line 660
def explain_static(task)
    return if !static?(task)

    if predicates[0].static?(task)
        this_generator  = task.event(predicates[0].event_name)
        if !predicates[0].evaluate(task) || evaluate(task)
            Explanation.new(nil, self, [this_generator])
        else # first event emitted, second event cannot be emitted (static)
            other_generator = task.event(predicates[1].event_name)
            Explanation.new(nil, self, [other_generator])
        end
    else
        other_generator = task.event(predicates[1].event_name)
        Explanation.new(nil, self, [other_generator])
    end
end
explain_true(task) click to toggle source
# File lib/roby/event_constraints.rb, line 642
def explain_true(task)
    return if !evaluate(task)

    this_event  = task.event(predicates[0].event_name).last
    other_event = task.event(predicates[1].event_name).last
    Explanation.new(true, self, [this_event, other_event])
end
static?(task) click to toggle source
# File lib/roby/event_constraints.rb, line 676
def static?(task)
    event0 = task.event(predicates[0].event_name)
    event1 = task.event(predicates[1].event_name)

    if event0.unreachable?
        (!predicates[0].evaluate(task) || # will stay false as pred[0] can't emit
         evaluate(task) || # will stay true as pred[0] can't emit
         predicates[1].static?(task))
    elsif event1.unreachable?
        !evaluate(task)
    end
end
to_s() click to toggle source
# File lib/roby/event_constraints.rb, line 694
def to_s; "#{predicates[0].event_name}.followed_by(#{predicates[1].event_name})" end