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# Author:: Eric Crane (mailto:eric.crane@mac.com)
# Copyright:: Copyright (c) 2020 Eric Crane. All rights reserved.
#
# A String.
#
module GlooLang
module Objs
class Alias < GlooLang::Core::Obj
KEYWORD = 'alias'.freeze
KEYWORD_SHORT = 'ln'.freeze
ALIAS_REFERENCE = '*'.freeze
#
# The name of the object type.
#
def self.typename
return KEYWORD
end
#
# The short name of the object type.
#
def self.short_typename
return KEYWORD_SHORT
end
#
# Set the value with any necessary type conversions.
#
def set_value( new_value )
self.value = new_value.to_s
end
# ---------------------------------------------------------------------
# Messages
# ---------------------------------------------------------------------
#
# Get a list of message names that this object receives.
#
def self.messages
return super + %w[resolve]
end
#
# Check to see if the referenced object exists.
#
def msg_resolve
pn = GlooLang::Core::Pn.new( @engine, self.value )
s = pn.exists?
@engine.heap.it.set_to s
return s
end
# ---------------------------------------------------------------------
# Resolve
# ---------------------------------------------------------------------
#
# Is the object an alias If so, then resolve it.
# The ref_name is the name used to refer to the object.
# If it ends with the * then we won't resolve the alias since
# we are trying to refer to the alias itself.
#
def self.resolve_alias( engine, obj, ref_name = nil )
return nil unless obj
return obj unless obj.type_display == GlooLang::Objs::Alias.typename
return obj if ref_name&.end_with?( ALIAS_REFERENCE )
ln = GlooLang::Core::Pn.new( engine, obj.value )
return ln.resolve
end
end
end
end
Version data entries
23 entries across 23 versions & 1 rubygems