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module Launchy::Detect
class RubyEngine
class NotFoundError < Launchy::Error; end
extend ::Launchy::DescendantTracker
# Detect the current ruby engine.
#
# If the current ruby engine cannot be detected, the return
# RubyEngine::Unknown
def self.detect( ruby_engine = RubyEngine.new )
found = find_child( :is_current_engine?, ruby_engine.to_s )
return found if found
raise NotFoundError, "#{ruby_engine_error_message( ruby_engine )} #{Launchy.bug_report_message}"
end
def self.ruby_engine_error_message( ruby_engine )
msg = "Unkonwn RUBY_ENGINE "
if ruby_engine then
msg += " '#{ruby_engine}'."
elsif defined?( RUBY_ENGINE ) then
msg += " '#{RUBY_ENGINE}'."
else
msg = "RUBY_ENGINE not defined for #{RUBY_DESCRIPTION}."
end
return msg
end
def self.is_current_engine?( ruby_engine )
return ruby_engine == self.engine_name
end
def self.mri?() self == Mri; end
def self.jruby?() self == Jruby; end
def self.rbx?() self == Rbx; end
def self.macruby?() self == MacRuby; end
attr_reader :ruby_engine
alias to_s ruby_engine
def initialize( ruby_engine = Launchy.ruby_engine )
if ruby_engine then
@ruby_engine = ruby_engine
else
@ruby_engine = defined?( RUBY_ENGINE ) ? RUBY_ENGINE : "ruby"
end
end
#-------------------------------
# The list of known ruby engines
#-------------------------------
#
# This is the ruby engine if the RUBY_ENGINE constant is not defined
class Mri < RubyEngine
def self.engine_name() "ruby"; end
def self.is_current_engine?( ruby_engine )
if ruby_engine then
super( ruby_engine )
else
return true if not Launchy.ruby_engine and not defined?( RUBY_ENGINE )
end
end
end
class Jruby < RubyEngine
def self.engine_name() "jruby"; end
end
class Rbx < RubyEngine
def self.engine_name() "rbx"; end
end
class MacRuby < RubyEngine
def self.engine_name() "macruby"; end
end
end
end
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