Lua embedded in Ruby, via Ruby FFI
http://www.lua.org/about.html says :
Lua is a powerful, fast, lightweight, embeddable scripting language.
Lua combines simple procedural syntax with powerful data description constructs based on associative arrays and extensible semantics. Lua is dynamically typed, runs by interpreting bytecode for a register-based virtual machine, and has automatic memory management with incremental garbage collection, making it ideal for configuration, scripting, and rapid prototyping.
- https://github.com/glejeune/ruby-lua by Gregoire Lejeune
- http://rubyluabridge.rubyforge.org/ by Evan Wies
- https://github.com/whitequark/rlua by Peter Zotov
On Debian GNU/Linux, I do
sudo apt-get install liblua5.1-0
If your system's package manager doesn't have some version (5.1.x) of Lua around, jump to "compiling liblua.dylib" below.
If you don't have liblua.dylib on your system, scroll until "compiling liblua.dylib" to learn how to get it.
gem install rufus-lua
or add to your Gemfile:
gem 'rufus-lua'then
require 'rufus/lua'
s = Rufus::Lua::State.new
puts s.eval("return table.concat({ 'hello', 'from', 'Lua' }, ' ')")
#
# => "Hello from Lua"
s.close require 'rufus/lua'
s = Rufus::Lua::State.new
s.function 'key_up' do |table|
table.inject({}) do |h, (k, v)|
h[k.to_s.upcase] = v
end
end
p s.eval(%{
local table = { CoW = 2, pigs = 3, DUCKS = 'none' }
return key_up(table) -- calling Ruby from Lua...
}).to_h
# => { 'COW' => 2.0, 'DUCKS => 'none', 'PIGS' => 3.0 }
s.closeIt's OK to bind a function inside of a table (library) :
require 'rufus/lua'
s = Rufus::Lua::State.new
s.eval("rubies = {}")
s.function 'add' do |x, y|
x + y
end
s.eval("rubies.add(1, 2)")
# => 3.0
s.closeYou can omit the table definition (only 1 level allowed here though) :
require 'rufus/lua'
s = Rufus::Lua::State.new
s.function 'rubies.add' do |x, y|
x + y
end
s.eval("rubies.add(1, 2)")
# => 3.0
s.closeThe specs contain more examples :
https://github.com/jmettraux/rufus-lua/tree/master/spec/
rufus-lua's rdoc is at :
http://rufus.rubyforge.org/rufus-lua/
original instructions by Adrian Perez at :
http://lua-users.org/lists/lua-l/2006-09/msg00894.html
get the source at
http://www.lua.org/ftp/lua-5.1.4.tar.gz
then
tar xzvf lua-5.1.4.tar.gz cd lua-5.1.4
modify the file src/Makefile as per http://lua-users.org/lists/lua-l/2006-09/msg00894.html
make make macosx # or make linux ... make -C src liblua.dylib sudo cp src/liblua.dylib /usr/local/lib/
sudo make macosx install
The following gems are needed to run the specs
sudo gem install bacon
ruby 1.8.7p72, ruby 1.9.1p0, jruby 1.2.0 jruby 1.1.6 has an issue with errors raised inside of Ruby functions (callbacks)
ruby-ffi 0.4.0 and 0.5.0
the ruby gem 'ffi'
On the rufus-ruby list :
http://groups.google.com/group/rufus-ruby
http://github.com/jmettraux/rufus-lua/issues
irc.freenode.net #ruote
http://github.com/jmettraux/rufus-lua
git clone git://github.com/jmettraux/rufus-lua.git
many thanks to the authors of Ruby FFI, and of Lua
- John Mettraux, [email protected], http://lambda.io/jmettraux
- Alain Hoang, http://blogs.law.harvard.edu/hoanga/
- Scott Persinger, http://github.com/scottpersinger/
MIT
Lua itself is licensed under the MIT license as well :