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embedding Lua in Ruby, via FFI
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= rufus-lua Lua embedded in Ruby, via Ruby FFI Tested with ruby 1.8.6, ruby 1.9.1p0, jruby 1.2.0 jruby 1.1.6 has an issue with errors raised inside of Ruby functions (callbacks) == Lua from http://www.lua.org/ http://www.lua.org/about.html """ 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. """ == other Ruby and Lua bridges / connectors http://rubyluabridge.rubyforge.org/ http://raa.ruby-lang.org/project/ruby-lua == using rufus-lua If you don't have liblua.dylib on your system, scroll until "compiling liblua.dylib" to learn how to get it. sudo gem install rufus-lua then require 'rubygems' require 'rufus/lua' s = Rufus::Lua::State.new puts s.eval("return table.concat({ 'hello', 'from', 'Lua' }, ' ')") # # => "Hello from Lua" s.close === binding Ruby code as Lua functions require 'rubygems' 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.close It's OK to bind a function inside of a table (library) : require 'rubygems' 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.close You can omit the table definition (only 1 level allowed here though) : require 'rubygems' 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.close The specs contain more examples : http://github.com/jmettraux/rufus-lua/tree/master/spec/ rufus-lua's rdoc is at : http://rufus.rubyforge.org/rufus-lua/ == compiling liblua.dylib 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 masocx # or make linux ... make -C src src liblua.dylib sudo cp src/liblua.dylib /usr/local/lib/ == build dependencies You need to add the github gems to your gem sources gem sources -a http://gems.github.com The following gems are needed to run the specs mislav-hanna install bacon == tested with ruby 1.8.6, ruby 1.9.1p0, jruby 1.2.0 jruby 1.1.6 has an issue with errors raised inside of Ruby functions (callbacks) == dependencies the ruby gem 'ffi' == mailing list On the rufus-ruby list : http://groups.google.com/group/rufus-ruby == issue tracker http://rubyforge.org/tracker/?atid=18584&group_id=4812&func=browse == irc irc.freenode.net #ruote == source http://github.com/jmettraux/rufus-lua git clone git://github.com/jmettraux/rufus-lua.git == credits many thanks to the authors of Ruby FFI, and of Lua http://kenai.com/projects/ruby-ffi/ http://lua.org/ == authors John Mettraux, [email protected], http://jmettraux.wordpress.com Alain Hoang, http://blogs.law.harvard.edu/hoanga/ == the rest of Rufus http://rufus.rubyforge.org == license MIT Lua itself is licensed under the MIT license as well : http://www.lua.org/license.html
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