Examples of LuaClosure

• org.luaj.vm2.LuaClosure
  Extension of {@link LuaFunction} which executes lua bytecode.

  A {@link LuaClosure} is a combination of a {@link Prototype} and a {@link LuaValue} to use as an environment for execution.

  There are three main ways {@link LuaClosure} instances are created:

  • Construct an instance using {@link #LuaClosure(Prototype,LuaValue)}
  • Construct it indirectly by loading a chunk via {@link LuaCompiler#load(java.io.InputStream,String,LuaValue)}
  • Execute the lua bytecode {@link Lua#OP_CLOSURE} as part of bytecode processing

  To construct it directly, the {@link Prototype} is typically created via a compiler such as {@link LuaC}:

    {@code InputStream is = new ByteArrayInputStream("print('hello,world').getBytes()); Prototype p = LuaC.instance.compile(is, "script"); LuaValue _G = JsePlatform.standardGlobals() LuaClosure f = new LuaClosure(p, _G);}

  To construct it indirectly, the {@link LuaC} compiler may be used, which implements the {@link LuaCompiler} interface:

    {@code LuaFunction f = LuaC.instance.load(is, "script", _G);}

  Typically, a closure that has just been loaded needs to be initialized by executing it, and its return value can be saved if needed:

    {@code LuaValue r = f.call(); _G.set( "mypkg", r ) }

  In the preceding, the loaded value is typed as {@link LuaFunction} to allow for the possibility of other compilers such as {@link LuaJC}producing {@link LuaFunction} directly without creating a {@link Prototype} or {@link LuaClosure}.

  Since a {@link LuaClosure} is a {@link LuaFunction} which is a {@link LuaValue}, all the value operations can be used directly such as:

  • {@link LuaValue#setfenv(LuaValue)}
  • {@link LuaValue#call()}
  • {@link LuaValue#call(LuaValue)}
  • {@link LuaValue#invoke()}
  • {@link LuaValue#invoke(Varargs)}
  • {@link LuaValue#method(String)}
  • {@link LuaValue#method(String,LuaValue)}
  • {@link LuaValue#invokemethod(String)}
  • {@link LuaValue#invokemethod(String,Varargs)}
  • ...

  @see LuaValue @see LuaFunction @see LuaValue#isclosure() @see LuaValue#checkclosure() @see LuaValue#optclosure(LuaClosure) @see LoadState @see LoadState#compiler

Examples of org.luaj.vm2.LuaClosure

Examples of org.luaj.vm2.LuaClosure