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Multiplatform Kotlin LuaJ port (LUA interpreter)
/*******************************************************************************
* Copyright (c) 2009 Luaj.org. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.luaj.vm2.lib.jse
import org.luaj.vm2.Globals
import org.luaj.vm2.LuaError
import org.luaj.vm2.LuaTable
import org.luaj.vm2.LuaValue
import org.luaj.vm2.Varargs
import org.luaj.vm2.compiler.LuaC
import org.luaj.vm2.lib.LibFunction
import org.luaj.vm2.lib.VarArgFunction
import java.lang.reflect.*
/**
* Subclass of [LibFunction] which implements the features of the luajava package.
*
*
* Luajava is an approach to mixing lua and java using simple functions that bind
* java classes and methods to lua dynamically. The API is documented on the
* [luajava](http://www.keplerproject.org/luajava/) documentation pages.
*
*
*
* Typically, this library is included as part of a call to
* [org.luaj.vm2.lib.jse.JsePlatform.standardGlobals]
* `Globals globals = JsePlatform.standardGlobals();
* System.out.println( globals.get("luajava").get("bindClass").call( LuaValue.valueOf("java.lang.System") ).invokeMethod("currentTimeMillis") );
` *
*
*
* To instantiate and use it directly,
* link it into your globals table via [Globals.load] using code such as:
* `Globals globals = new Globals();
* globals.load(new JseBaseLib());
* globals.load(new PackageLib());
* globals.load(new LuajavaLib());
* globals.load(
* "sys = luajava.bindClass('java.lang.System')\n"+
* "print ( sys:currentTimeMillis() )\n", "main.lua" ).call();
` *
*
*
*
* The `luajava` library is available
* on all JSE platforms via the call to [org.luaj.vm2.lib.jse.JsePlatform.standardGlobals]
* and the luajava api's are simply invoked from lua.
* Because it makes extensive use of Java's reflection API, it is not available
* on JME, but can be used in Android applications.
*
*
* This has been implemented to match as closely as possible the behavior in the corresponding library in C.
*
* @see LibFunction
*
* @see org.luaj.vm2.lib.jse.JsePlatform
* //@see org.luaj.vm2.lib.jme.JmePlatform
*
* @see LuaC
*
* @see CoerceJavaToLua
*
* @see CoerceLuaToJava
*
* @see [http://www.keplerproject.org/luajava/manual.html.luareference](http://www.keplerproject.org/luajava/manual.html.luareference)
*/
class LuajavaLib : VarArgFunction() {
override fun invoke(args: Varargs): Varargs {
try {
when (opcode) {
INIT -> {
// LuaValue modname = args.arg1();
val env = args.arg(2)
val t = LuaTable()
bind(t, { LuajavaLib() }, NAMES, BINDCLASS)
env["luajava"] = t
env["package"]["loaded"]["luajava"] = t
return t
}
BINDCLASS -> {
val clazz = classForName(args.checkjstring(1))
return JavaClass.forClass(clazz)
}
NEWINSTANCE, NEW -> {
// get constructor
val c = args.checkvalue(1)
val clazz =
if (opcode == NEWINSTANCE) classForName(c.tojstring()) else c.checkuserdata(Class::class) as Class<*>?
val consargs = args.subargs(2)
return JavaClass.forClass(clazz!!).getConstructor()!!.invoke(consargs)
}
CREATEPROXY -> {
val niface = args.narg() - 1
if (niface <= 0)
throw LuaError("no interfaces")
val lobj = args.checktable(niface + 1)
// get the interfaces
val ifaces = Array(niface) { classForName(args.checkjstring(it + 1)) }
// create the invocation handler
val handler = ProxyInvocationHandler(lobj!!)
// create the proxy object
val proxy = Proxy.newProxyInstance(javaClass.classLoader, ifaces, handler)
// return the proxy
return LuaValue.userdataOf(proxy)
}
LOADLIB -> {
// get constructor
val classname = args.checkjstring(1)
val methodname = args.checkjstring(2)
val clazz = classForName(classname)
val method = clazz.getMethod(methodname!!, *arrayOf())
val result = method.invoke(clazz, *arrayOf())
return result as? LuaValue ?: LuaValue.NIL
}
else -> throw LuaError("not yet supported: $this")
}
} catch (e: LuaError) {
throw e
} catch (ite: InvocationTargetException) {
throw LuaError(ite.targetException)
} catch (e: Exception) {
throw LuaError(e)
}
}
// load classes using app loader to allow luaj to be used as an extension
protected fun classForName(name: String?): Class<*> {
return Class.forName(name, true, ClassLoader.getSystemClassLoader())
}
class ProxyInvocationHandler constructor(private val lobj: LuaValue) : InvocationHandler {
override fun invoke(proxy: Any, method: Method, args: kotlin.Array?): Any? {
val name = method.name
val func = lobj[name]
if (func.isnil())
return null
val isvarargs = method.modifiers and METHOD_MODIFIERS_VARARGS != 0
var n = if (args != null) args!!.size else 0
val v: kotlin.Array
if (isvarargs) {
val o = args!![--n]
val m = java.lang.reflect.Array.getLength(o)
v = arrayOfNulls(n + m) as kotlin.Array
for (i in 0 until n) v[i] = CoerceJavaToLua.coerce(args!![i])
for (i in 0 until m) v[i + n] = CoerceJavaToLua.coerce(java.lang.reflect.Array.get(o, i))
} else {
v = Array(n) { CoerceJavaToLua.coerce(args!![it]) }
}
val result = func.invoke(v).arg1()
return CoerceLuaToJava.coerce(result, method.returnType)
}
}
companion object {
internal const val INIT = 0
internal const val BINDCLASS = 1
internal const val NEWINSTANCE = 2
internal const val NEW = 3
internal const val CREATEPROXY = 4
internal const val LOADLIB = 5
@kotlin.jvm.JvmField
internal val NAMES = arrayOf("bindClass", "newInstance", "new", "createProxy", "loadLib")
internal const val METHOD_MODIFIERS_VARARGS = 0x80
}
}