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# frozen_string_literal: true
require_relative '../datatype/all_datatypes'
module Loxxy
module BackEnd
# Runtime representation of a Lox object (instance).
class LoxInstance
# @return BackEnd::LoxClass] the class that this object is an instance of
attr_reader :klass
attr_reader :engine
# @return [Hash{String => BuiltinDatatype | LoxFunction | LoxInstance }]
attr_reader :fields
# Create an instance from given class
# @param aClass [BackEnd::LoxClass] the class this this object belong
def initialize(aClass, anEngine)
@klass = aClass
@engine = anEngine
@fields = {}
end
# In Lox, only false and Nil have false value...
# @return [FalseClass]
def falsey?
false # Default implementation
end
# Any instance is truthy
# @return [TrueClass]
def truthy?
true # Default implementation
end
# Text representation of a Lox instance
def to_str
"#{klass.to_str} instance"
end
def accept(_visitor)
engine.expr_stack.push self
end
# Look up the value of property with given name
# aName [String] name of object property
def get(aName)
return fields[aName] if fields.include? aName
method = klass.find_method(aName)
unless method
raise Loxxy::RuntimeError, "Undefined property '#{aName}'."
end
method.bind(self)
end
# Set the value of property with given name
# aName [String] name of object property
def set(aName, aValue)
fields[aName] = aValue
end
end # class
end # module
end # module
Version data entries
9 entries across 9 versions & 1 rubygems