Search results
Luna compiles Lua functions into Java classes and loads them into the JVM; the compiler performs a type analysis of the Lua programs in order to generate a more tightly-typed code whenever feasible. Since the JVM does not directly support coroutines, Luna treats Lua functions as state machines and controls their execution (i.e., yields, resumes and pauses) using exceptions.
Aug 3, 2020 · 2. Lua is a C library, you can embed it in Java but you'll have to interface the java virtual machine and Lua with some C code. The LuaJava authors have already done that work - you're better off using that than writing your own. answered Jan 21, 2010 at 22:57. nos.
Jul 18, 2018 · I'm not sure about your cases of using Lua with Java, but one of options - compile Lua to JVM bytecode and execute it on JVM, interacting with any Java code. For interpretation of Lua on JVM you can use: LuaJ - Lua interpreter based on the 5.2.x version of Lua; Rembulan - implementation of Lua 5.3 for JVM.
- Overview
- Getting Started with LuaJ
- Goals of Luaj
- Luaj version and Lua Versions
- Performance
- Run a lua script in Java SE
- Compile lua source to lua bytecode
- Compile lua source or bytecode to java bytecode
- Run a script in a Java Application
- Run a script in a MIDlet
This repository has been forked from the original CVS sources of Luaj. The commit history has been converted to make sure that the original work of James Roseborough and Ian Farmer is not lost. Unfortunately, I was not able to contact either James or Ian to hand over ownership of the Github organization/repo as I have originally intended to. The community however seems interested enough to continue work on the original sources and therefore I have decided to make sure that any useful pull requests that may add some value to the original code base shall be merged in from now on.
-- Benjamin P. Jung, Jan. 26th 2018
James Roseborough, Ian Farmer, Version 3.0.2
Copyright © 2009-2014 Luaj.org. Freely available under the terms of the Luaj license.
Luaj is a lua interpreter based on the 5.2.x version of lua with the following goals in mind:
•Java-centric implementation of lua vm built to leverage standard Java features.
•Lightweight, high performance execution of lua.
•Multi-platform to be able to run on JME, JSE, or JEE environments.
•Complete set of libraries and tools for integration into real-world projects.
•Dependable due to sufficient unit testing of vm and library features.
Luaj 3.0.x
Support for lua 5.2.x features: •_ENV environments model. •yield from pcall or metatags. •Bitwise operator library. It also includes miscellaneous improvements over luaj 2.0.x: •Better thread safety. •More compatible table behavior. •Better coroutine-related garbage collection. •Maven integration. •Better debug reporting when using closures. •Line numbers in parse syntax tree.
Luaj 2.0.x
Support for lua 5.1.x features, plus: •Support for compiling lua source code into Java source code. •Support for compiling lua bytecode directly into Java bytecode. •Stackless vm design centered around dynamically typed objects. •Good alignment with C API (see names.csv for details) •Implementation of weak keys and values, and all metatags.
Luaj 1.0.x
Support for most lua 5.1.x features.
Good performance is a major goal of luaj. The following table provides measured execution times on a subset of benchmarks from the computer language benchmarks game in comparison with the standard C distribution.
Luaj in interpreted mode performs well for the benchmarks, and even better when the lua-to-java-bytecode (luajc) compiler is used, and actually executes faster than C-based lua in some cases.
From the main distribution directory line type:
You should see the following output:
To see how luaj can be used to acccess most Java API's including swing, try:
Links to sources:
From the main distribution directory line type:
The compiled output "luac.out" is lua bytecode and should run and produce the same result.
Luaj can compile lua sources or binaries directly to java bytecode if the bcel library is on the class path. From the main distribution directory line type:
The output hello.class is Java bytecode, should run and produce the same result. There is no runtime dependency on the bcel library, but the compiled classes must be in the class path at runtime, unless runtime jit-compiling via luajc and bcel are desired (see later sections).
A simple hello, world example in luaj is:
Loading from a file is done via Globals.loadFile():
Chunks can also be loaded from a Reader as text source
or an InputStream to be loaded as text source "t", or binary lua file "b":
A simple example may be found in
You must include the library luaj-jse-3.0.2.jar in your class path.
For MIDlets the JmePlatform is used instead:
The file must be a resource within within the midlet jar for the loader to find it. Any files included via require() must also be part of the midlet resources.
A simple example may be found in
You must include the library luaj-jme-3.0.2.jar in your midlet jar.
An ant script to build and run the midlet is in
You must install the wireless toolkit and define WTK_HOME for this script to work.
Dec 10, 2018 · Java follows a more verbose syntax with a strong emphasis on object-oriented programming principles. On the other hand, Lua has a more lightweight and flexible syntax, making it suitable for scripting and embedding into other applications. Typing: Another difference lies in the typing system of both languages.
Jan 13, 2017 · 1. Well I have been using LuaJ for the last month and while the documentation is indeed terrible the API itself is very flexible. The source is open so you can study it yourself and (well at least that's how it works for me) eventually have a better understanding then I think you'd accomplish with documentation.
People also ask
Is there a way to use Lua in Java?
Is Lua a Java scripting language?
What is the difference between Java and Lua?
Is Lua a Java bytecode?
How do I compile from Lua to Java bytecode?
Is there a pure Java implementation of Lua?
Lua (/ ˈ l uː ə / LOO-ə; from Portuguese: lua meaning moon) is a lightweight, high-level, multi-paradigm programming language designed mainly for embedded use in applications. [3] Lua is cross-platform software , since the interpreter of compiled bytecode is written in ANSI C , [ 4 ] and Lua has a relatively simple C application programming interface ( API ) to embed it into applications.
