Class: Marty::ScriptSet

Inherits:
Delorean::AbstractContainer
  • Object
show all
Defined in:
app/helpers/marty/script_set.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tag = nil) ⇒ ScriptSet

Returns a new instance of ScriptSet.



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# File 'app/helpers/marty/script_set.rb', line 13

def initialize(tag = nil)
  @tag = Marty::Tag.map_to_tag(tag)
  super()
end

Instance Attribute Details

#tag ⇒ Object (readonly)

ScriptSet acts as a process-wide cache for Delorean engines. FIXME: rewrite as Singleton.



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# File 'app/helpers/marty/script_set.rb', line 5

def tag
  @tag
end

Class Method Details

.clear_cache ⇒ Object 



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# File 'app/helpers/marty/script_set.rb', line 7

def self.clear_cache
  @@engines, @@dengines, @@dengines_dt = {}, {}, nil
end

Instance Method Details

#get_engine(sname) ⇒ Object 



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# File 'app/helpers/marty/script_set.rb', line 24

def get_engine(sname)
  raise "bad sname #{sname}" unless sname.is_a?(String)

  if tag.isdev?
    # FIXME: there are race conditions here if a script changes in
    # the middle of a DEV import sequence. But, DEV imports are
    # hacky/rare anyway.  So, don't bother for now.

    max_dt = Marty::Script.
      order('created_dt DESC').limit(1).pluck(:created_dt).first

    @@dengines_dt ||= max_dt

    # reset dengine cache if a script has changed
    @@dengines = {} if max_dt > @@dengines_dt

    engine = @@dengines[sname]

    return engine if engine

    script = Marty::Script.find_script(sname, tag) || raise('No such script')

    @@dengines[sname] = parse_check(sname, script.body)
  else
    engine = @@engines[[tag.id, sname]]

    return engine if engine

    script = Marty::Script.find_script(sname, tag) || raise('No such script')

    @@engines[[tag.id, sname]] = parse_check(sname, script.body)
  end
end

#parse_check(sname, body) ⇒ Object 



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# File 'app/helpers/marty/script_set.rb', line 18

def parse_check(sname, body)
  engine = Delorean::Engine.new(sname, self)
  engine.parse(body)
  engine
end