Class: TEALrb::Scratch

Inherits:
Object
  • Object
show all
Defined in:
lib/tealrb/scratch.rb

Instance Method Summary collapse

Constructor Details

#initialize(contract) ⇒ Scratch

Returns a new instance of Scratch.



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# File 'lib/tealrb/scratch.rb', line 5

def initialize(contract)
  @open_slots = (0..256).to_a
  @named_slots = {}
  @values = {}
  @contract = contract
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/tealrb/scratch.rb', line 12

def [](key)
  @contract.teal << "load #{@named_slots[key]} // #{key}"
  @values[key]
end

#[]=(key, value) ⇒ Object 



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# File 'lib/tealrb/scratch.rb', line 17

def []=(key, value)
  store(key, value)
end

#delete(key) ⇒ Object 



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# File 'lib/tealrb/scratch.rb', line 26

def delete(key)
  @values.delete(key)
  @open_slots << @named_slots.delete(key)
end

#reserve(slot) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/tealrb/scratch.rb', line 31

def reserve(slot)
  name = @named_slots.key(slot)
  raise ArgumentError, "Attempted to reserve a slot (#{slot}) that corresponds to a named slot (#{name})" if name

  @open_slots.delete slot
end

#store(key, value = @contract.teal) ⇒ Object 



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# File 'lib/tealrb/scratch.rb', line 21

def store(key, value = @contract.teal)
  @values[key] = value
  @contract.teal << "store #{@named_slots[key] ||= @open_slots.shift} // #{key}"
end

#unreserve(slot) ⇒ Object 



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# File 'lib/tealrb/scratch.rb', line 38

def unreserve(slot)
  @open_slots << slot
end