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/*******************************************************************************
* Copyright (c) 2010 Luaj.org. All rights reserved.
*
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* 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.
*
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package org.luaj.vm2.luajc;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.Hashtable;
import org.luaj.vm2.Globals;
import org.luaj.vm2.LuaClosure;
import org.luaj.vm2.LuaFunction;
import org.luaj.vm2.LuaValue;
import org.luaj.vm2.Prototype;
import org.luaj.vm2.compiler.LuaC;
/**
* Implementation of {@link org.luaj.vm2.Globals.Compiler} which does direct
* lua-to-java-bytecode compiling.
*
* By default, when using {@link org.luaj.vm2.lib.jse.JsePlatform} or
* {@link org.luaj.vm2.lib.jme.JmePlatform}
* to construct globals, the plain compiler {@link LuaC} is installed and lua code
* will only be compiled into lua bytecode and execute as {@link LuaClosure}.
*
* To override the default compiling behavior with {@link LuaJC}
* lua-to-java bytecode compiler, install it before undumping code,
* for example:
*
{@code
* LuaValue globals = JsePlatform.standardGlobals();
* LuaJC.install(globals);
* LuaValue chunk = globals.load( "print('hello, world'), "main.lua");
* System.out.println(chunk.isclosure()); // Will be false when LuaJC is working.
* chunk.call();
* }
*
* This requires the bcel library to be on the class path to work as expected.
* If the library is not found, the default {@link LuaC} lua-to-lua-bytecode
* compiler will be used.
*
* @see Globals#compiler
* @see #install(Globals)
* @see org.luaj.vm2.compiler.LuaC
* @see LuaValue
*/
public class LuaJC implements Globals.Loader {
public static final LuaJC instance = new LuaJC();
/**
* Install the compiler as the main Globals.Loader to use in a set of globals.
* Will fall back to the LuaC prototype compiler.
*/
public static final void install(Globals G) {
G.loader = instance;
}
protected LuaJC() {}
public Hashtable compileAll(InputStream script, String chunkname, String filename, Globals globals, boolean genmain) throws IOException {
final String classname = toStandardJavaClassName( chunkname );
final Prototype p = globals.loadPrototype(script, classname, "bt");
return compileProtoAndSubProtos(p, classname, filename, genmain);
}
public Hashtable compileAll(Reader script, String chunkname, String filename, Globals globals, boolean genmain) throws IOException {
final String classname = toStandardJavaClassName( chunkname );
final Prototype p = globals.compilePrototype(script, classname);
return compileProtoAndSubProtos(p, classname, filename, genmain);
}
private Hashtable compileProtoAndSubProtos(Prototype p, String classname, String filename, boolean genmain) throws IOException {
final String luaname = toStandardLuaFileName( filename );
final Hashtable h = new Hashtable();
final JavaGen gen = new JavaGen(p, classname, luaname, genmain);
insert( h, gen );
return h;
}
private void insert(Hashtable h, JavaGen gen) {
h.put(gen.classname, gen.bytecode);
for ( int i=0, n=gen.inners!=null? gen.inners.length: 0; i 0) && Character.isJavaIdentifierPart(c)))? c: '_');
}
return classname.toString();
}
private static String toStandardLuaFileName( String luachunkname ) {
String stub = toStub( luachunkname );
String filename = stub.replace('.','/')+".lua";
return filename.startsWith("@")? filename.substring(1): filename;
}
private static String toStub( String s ) {
String stub = s.endsWith(".lua")? s.substring(0,s.length()-4): s;
return stub;
}
}