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# frozen_string_literal: true
require_relative 'term'
require_relative 'any_value'
module MiniKraken
module Core
# A variable reference represents the occurrence of a variable (name) in a
# MiniKraken term.
class VariableRef < Term
include Designation # Mixin: Acquire name attribute
alias var_name name
# @param aName [String] The name of the variable
def initialize(aName)
init_designation(aName)
end
# @param aValue [Term]
# @param env [Environment]
def associate(aValue, env)
env.add_assoc(var_name, aValue)
end
# @param env [Environment]
# @return [Array<Term>]
def values(env)
env[var_name].map(&:value)
end
# @param env [Environment]
# @return [Term, NilClass]
def value(env)
freshness = env.freshness_ref(self)
freshness.associated
end
# @param env [Environment]
def quote(env)
val = env.quote_ref(self)
val.nil? ? AnyValue.new(var_name, env, names_fused(env)) : val
end
# param another [VariableRef]
# @param env [Environment]
# @return [Boolean]
def fused_with?(another, env)
my_var = env.name2var(var_name)
return false unless my_var.fused?
other_var = env.name2var(another.var_name)
return my_var.i_name == other_var.i_name
end
def names_fused(env)
env.names_fused(var_name)
end
# param another [VariableRef]
# @param env [Environment]
# @return [Boolean]
def different_from?(another, env)
!fused_with?(another, env)
end
private
def valid_name(aName)
if aName.empty?
raise StandardError, 'Variable name may not be empty.'
end
aName
end
end # class
end # module
end # module
Version data entries
9 entries across 9 versions & 1 rubygems