glejeune / ruby-lua

Call Lua from Ruby (and Ruby from Lua in Ruby)

ruby-lua¶ ↑

Call Lua from Ruby (and Ruby from Lua in Ruby)

Language::Lua - Lua interpretor for Ruby

SYNOPSIS¶ ↑

require 'language/lua'
lua = Language::Lua.new()
lua.eval("script.lua")

out = lua.my_lua_function( ... )
print out;

Ruby API¶ ↑

class Language::Lua¶ ↑

new¶ ↑

Create a new Lua interpretor

load(filename)¶ ↑

Load a Lua Script

dofile(filename)¶ ↑

alias for load

call(, fname, *args)¶ ↑

Call the Lua function named fname with arguemnts *args

If first argument is true, the function result is not poped from the Lua Stack (default: false).

var(, vname, value)¶ ↑

Return the lua vname value or set the lua vname if value is given.

eval(lua_code)¶ ↑

Evaluate the lua_code

pop()¶ ↑

Pop the lua value on the top of the Lua stack

push(value)¶ ↑

Push the value on the top of the Lua stack

stack_size()¶ ↑

Return the Lua stack size

stack_dump()¶ ↑

Display the content of the Lua stack

class Language::Lua::Function¶ ↑

call(*args)¶ ↑

Call the current Lua function with arguments *args

Lua ¶ ↑

Ruby/Lua adds the following new method to Lua :

ruby(“ruby_function”, …)¶ ↑

In your Lua code, call ruby_function.

Contributing to ruby-lua¶ ↑

• Check out the latest master to make sure the feature hasn’t been implemented or the bug hasn’t been fixed yet

• Check out the issue tracker to make sure someone already hasn’t requested it and/or contributed it

• Fork the project

• Start a feature/bugfix branch

• Commit and push until you are happy with your contribution

• Make sure to add tests for it. This is important so I don’t break it in a future version unintentionally.

• Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

Copyright¶ ↑

Copyright © 2010-2013 Gregoire Lejeune. See LICENSE.txt for further details.

ruby-lua's Issues

cannot load such file -- language/lua/function

When I try to do a lua.call, I got this error.

cannot load such file -- language/lua/function

I'm using ruby 2.1, and lua5.1

Error trying to use Ruby-lua

Hello,

When running ruby-luas example code i get:

.9.3p194 :034 > lua = Language::Lua.new()
dyld: lazy symbol binding failed: Symbol not found: _lua_newstate
Referenced from: /Users/daniel/.rvm/gems/ruby-1.9.3-p194/gems/ruby-lua-0.3.0/lib/language/lua.bundle
Expected in: flat namespace

dyld: Symbol not found: _lua_newstate
Referenced from: /Users/daniel/.rvm/gems/ruby-1.9.3-p194/gems/ruby-lua-0.3.0/lib/language/lua.bundle
Expected in: flat namespace

(irb):34: [BUG] Segmentation fault
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.4.2]

I have Lua and ruby installed + the gem..

Translate Lua functions to Ruby procs

Currently ruby-lua exposes functions inside Lua tables as nil:

1.9.3p194 :006 > lua.var('string')
 => {"sub"=>nil, "upper"=>nil, "len"=>nil, "gfind"=>nil, "rep"=>nil, "find"=>nil, "match"=>nil, "char"=>nil, "dump"=>nil, "gmatch"=>nil, "reverse"=>nil, "byte"=>nil, "format"=>nil, "gsub"=>nil, "lower"=>nil} 
1.9.3p194 :007 >

Is there some reasonably simple way to expose them, perhaps as Ruby procs which call the Lua function?

It would also be great to be able to call Lua functions from inside tables, to avoid having to export everything to a global:

1.9.3p194 :010 > lua.call(false, 'string.len', 'foo')
SystemCallError: unknown error - error running lua function `string.len': attempt to call a nil value
    from (irb):10:in `call'
    from (irb):10
    from /Users/norman/.rvm/gems/ruby-1.9.3-p194-perf/gems/railties-3.2.6/lib/rails/commands/console.rb:47:in `start'
    from /Users/norman/.rvm/gems/ruby-1.9.3-p194-perf/gems/railties-3.2.6/lib/rails/commands/console.rb:8:in `start'
    from /Users/norman/.rvm/gems/ruby-1.9.3-p194-perf/gems/railties-3.2.6/lib/rails/commands.rb:41:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

Lua 5.2 support

Add Lua 5.2 support

Ubuntu 12.04 LTS build fails

Ubuntu's packages lua as lua5.1. To build correctly I had to update extconf.rb to:

elsif ex = find_executable( "pkg-config" )
   ["lua", "lua5.1"].any? do |lib|
     res = `#{ex} --libs #{lib}`.chomp
     next false if res.empty?

     $LDFLAGS << " #{res}"
     $CFLAGS  << ' ' + `#{ex} --cflags #{lib}`.chomp
     true
   end
else