Class: Keisan::Functions::Registry

Inherits:
Object
  • Object
show all
Defined in:
lib/keisan/functions/registry.rb

Instance Method Summary collapse

Constructor Details

#initialize(functions: {}, parent: nil, use_defaults: true, force: false) ⇒ Registry

Returns a new instance of Registry.



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# File 'lib/keisan/functions/registry.rb', line 4

def initialize(functions: {}, parent: nil, use_defaults: true, force: false)
  @hash = {}
  @parent = parent
  @use_defaults = use_defaults

  functions.each do |name, function|
    register!(name, function, force: force)
  end
end

Instance Method Details

#[](name) ⇒ Object 



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# File 'lib/keisan/functions/registry.rb', line 14

def [](name)
  return @hash[name] if @hash.has_key?(name)

  if @parent && (parent_value = @parent[name])
    return parent_value
  end

  return default_registry[name] if @use_defaults && default_registry.has_name?(name)
  raise Exceptions::UndefinedFunctionError.new name
end

#has?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/keisan/functions/registry.rb', line 29

def has?(name)
  !!self[name]
rescue Exceptions::UndefinedFunctionError
  false
end

#locals ⇒ Object 



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# File 'lib/keisan/functions/registry.rb', line 25

def locals
  @hash
end

#modifiable?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/keisan/functions/registry.rb', line 35

def modifiable?(name)
  !frozen? && has?(name)
end

#register!(name, function, force: false) ⇒ Object

Raises:



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# File 'lib/keisan/functions/registry.rb', line 39

def register!(name, function, force: false)
  raise Exceptions::UnmodifiableError.new("Cannot modify frozen functions registry") if frozen?
  name = name.to_s

  case function
  when Proc
    self[name] = ProcFunction.new(name, function)
  when Function
    self[name] = function
  else
    raise Exceptions::InvalidFunctionError.new
  end
end