Class: Dentaku::AST::FunctionRegistry

Inherits:
Hash
  • Object
show all
Defined in:
lib/dentaku/ast/function_registry.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.default ⇒ Object 



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# File 'lib/dentaku/ast/function_registry.rb', line 111

def self.default
  Dentaku::AST::Function.registry
end

Instance Method Details

#default ⇒ Object 



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# File 'lib/dentaku/ast/function_registry.rb', line 107

def default
  self.class.default
end

#get(name) ⇒ Object 



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# File 'lib/dentaku/ast/function_registry.rb', line 4

def get(name)
  name = function_name(name)
  return self[name] if has_key?(name)
  return default[name] if default.has_key?(name)
  nil
end

#register(name, type, implementation, callback = nil, volatile: false) ⇒ Object 



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# File 'lib/dentaku/ast/function_registry.rb', line 11

def register(name, type, implementation, callback = nil, volatile: false)
  function = Class.new(Function) do
    def self.name=(name)
      @name = name.to_s
    end

    def self.name
      @name
    end

    # only the first registration of a given name claims the constant
    # under Dentaku::AST::Function, so later ones stay anonymous and
    # would otherwise render as "#<Class:0x...>" in error messages
    def self.display_name=(display_name)
      @display_name = display_name
    end

    def self.to_s
      @display_name || super
    end

    def self.inspect
      to_s
    end

    def self.implementation=(impl)
      @implementation = impl
    end

    def self.implementation
      @implementation
    end

    def self.type=(type)
      @type = type
    end

    def self.type
      @type
    end

    def self.callback=(callback)
      @callback = callback
    end

    def self.callback
      @callback
    end

    def self.volatile=(volatile)
      @volatile = volatile
    end

    def self.volatile?
      @volatile
    end

    def self.arity
      @implementation.arity < 0 ? nil : @implementation.arity
    end

    def self.min_param_count
      @implementation.parameters.select { |type, _name| type == :req }.count
    end

    def self.max_param_count
      @implementation.parameters.select { |type, _name| type == :rest }.any? ? Float::INFINITY : @implementation.parameters.count
    end

    def value(context = {})
      args = @args.map { |a| a.value(context) }
      self.class.implementation.call(*args)
    end

    def type
      self.class.type
    end
  end

  function.name = name
  function.display_name = "#{Function}::#{normalize_name(name)}"

  define_class(name, function)

  function.type = type
  function.implementation = implementation
  function.callback = callback
  function.volatile = volatile

  self[function_name(name)] = function
end

#register_class(name, function_class) ⇒ Object 



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# File 'lib/dentaku/ast/function_registry.rb', line 103

def register_class(name, function_class)
  self[function_name(name)] = function_class
end