Class: Dentaku::AST::Function

Inherits:
Node
  • Object
show all
Defined in:
lib/dentaku/ast/function.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Node

arity, precedence

Constructor Details

#initialize(*args) ⇒ Function

Returns a new instance of Function.



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# File 'lib/dentaku/ast/function.rb', line 6

def initialize(*args)
  @args = args
end

Class Method Details

.get(name) ⇒ Object 



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# File 'lib/dentaku/ast/function.rb', line 14

def self.get(name)
  registry.fetch(function_name(name)) {
    fail ParseError, "Undefined function #{ name }"
  }
end

.register(name, type, implementation) ⇒ Object 



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# File 'lib/dentaku/ast/function.rb', line 20

def self.register(name, type, implementation)
  function = Class.new(self) do
    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 value(context={})
      args = @args.map { |a| a.value(context) }
      self.class.implementation.call(*args)
    end

    def type
      self.class.type
    end
  end

  function_class = name.to_s.capitalize
  Dentaku::AST.send(:remove_const, function_class) if Dentaku::AST.const_defined?(function_class, false)
  Dentaku::AST.const_set(function_class, function)

  function.implementation = implementation
  function.type = type

  registry[function_name(name)] = function
end

.register_class(name, function_class) ⇒ Object 



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# File 'lib/dentaku/ast/function.rb', line 58

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

Instance Method Details

#dependencies(context = {}) ⇒ Object 



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# File 'lib/dentaku/ast/function.rb', line 10

def dependencies(context={})
  @args.flat_map { |a| a.dependencies(context) }
end