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Contents
# frozen_string_literal: true
require_relative '../datatype/all_datatypes'
require_relative 'lox_instance'
module Loxxy
module BackEnd
# Runtime representation of a Lox class.
class LoxClass
# @return [String] The name of the class
attr_reader :name
attr_reader :superclass
# @return [Hash{String => LoxFunction}] the list of methods
attr_reader :meths
# @return [Loxxy::BackEnd::Engine]
attr_reader :engine
# Create a class with given name
# @param aName [String] The name of the class
def initialize(aName, aSuperclass, theMethods, anEngine)
@name = aName.dup
@superclass = aSuperclass
@meths = {}
theMethods.each do |func|
meths[func.name] = func
end
@engine = anEngine
end
def accept(_visitor)
engine.expr_stack.push self
end
def arity
initializer = find_method('init')
initializer ? initializer.arity : 0
end
def call(engine, visitor)
instance = LoxInstance.new(self, engine)
initializer = find_method('init')
if initializer
constructor = initializer.bind(instance)
constructor.call(engine, visitor)
else
engine.expr_stack.push(instance)
end
end
# @param aName [String] the method name to search for
def find_method(aName)
found = meths[aName]
unless found || superclass.nil?
found = superclass.find_method(aName)
end
found
end
# Logical negation.
# As a function is a truthy thing, its negation is thus false.
# @return [Datatype::False]
def !
Datatype::False.instance
end
# Text representation of a Lox class
def to_str
name
end
end # class
end # module
end # module
Version data entries
11 entries across 11 versions & 1 rubygems