234 lines
7.0 KiB
Java
234 lines
7.0 KiB
Java
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/*******************************************************************************
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* Copyright (c) 2009-2012 Luaj.org. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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******************************************************************************/
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import java.io.BufferedInputStream;
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import java.io.BufferedReader;
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import java.io.ByteArrayInputStream;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.util.Vector;
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import org.luaj.vm2.Globals;
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import org.luaj.vm2.Lua;
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import org.luaj.vm2.LuaTable;
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import org.luaj.vm2.LuaValue;
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import org.luaj.vm2.Print;
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import org.luaj.vm2.Varargs;
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import org.luaj.vm2.lib.jse.JsePlatform;
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import org.luaj.vm2.luajc.LuaJC;
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/**
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* lua command for use in JSE environments.
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*/
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public class lua {
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private static final String version = Lua._VERSION + " Copyright (c) 2012 Luaj.org.org";
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private static final String usage = "usage: java -cp luaj-jse.jar lua [options] [script [args]].\n"
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+ "Available options are:\n" + " -e stat execute string 'stat'\n" + " -l name require library 'name'\n"
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+ " -i enter interactive mode after executing 'script'\n" + " -v show version information\n"
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+ " -b use luajc bytecode-to-bytecode compiler (requires bcel on class path)\n"
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+ " -n nodebug - do not load debug library by default\n" + " -p print the prototype\n"
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+ " -c enc use the supplied encoding 'enc' for input files\n" + " -- stop handling options\n"
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+ " - execute stdin and stop handling options";
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private static void usageExit() {
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System.out.println(usage);
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System.exit(-1);
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}
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private static Globals globals;
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private static boolean print = false;
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private static String encoding = null;
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public static void main(String[] args) throws IOException {
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// process args
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boolean interactive = args.length == 0;
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boolean versioninfo = false;
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boolean processing = true;
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boolean nodebug = false;
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boolean luajc = false;
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Vector libs = null;
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try {
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// stateful argument processing
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for (int i = 0; i < args.length; i++) {
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if (!processing || !args[i].startsWith("-")) {
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// input file - defer to last stage
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break;
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} else if (args[i].length() <= 1) {
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// input file - defer to last stage
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break;
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} else {
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switch (args[i].charAt(1)) {
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case 'e':
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if (++i >= args.length)
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usageExit();
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// input script - defer to last stage
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break;
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case 'b':
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luajc = true;
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break;
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case 'l':
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if (++i >= args.length)
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usageExit();
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libs = libs != null? libs: new Vector();
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libs.addElement(args[i]);
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break;
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case 'i':
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interactive = true;
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break;
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case 'v':
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versioninfo = true;
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break;
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case 'n':
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nodebug = true;
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break;
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case 'p':
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print = true;
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break;
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case 'c':
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if (++i >= args.length)
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usageExit();
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encoding = args[i];
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break;
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case '-':
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if (args[i].length() > 2)
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usageExit();
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processing = false;
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break;
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default:
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usageExit();
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break;
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}
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}
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}
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// echo version
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if (versioninfo)
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System.out.println(version);
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// new lua state
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globals = nodebug? JsePlatform.standardGlobals(): JsePlatform.debugGlobals();
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if (luajc)
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LuaJC.install(globals);
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for (int i = 0, n = libs != null? libs.size(): 0; i < n; i++)
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loadLibrary((String) libs.elementAt(i));
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// input script processing
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processing = true;
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for (int i = 0; i < args.length; i++) {
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if (!processing || !args[i].startsWith("-")) {
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processScript(new FileInputStream(args[i]), args[i], args, i);
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break;
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} else if ("-".equals(args[i])) {
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processScript(System.in, "=stdin", args, i);
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break;
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} else {
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switch (args[i].charAt(1)) {
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case 'l':
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case 'c':
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++i;
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break;
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case 'e':
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++i;
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processScript(new ByteArrayInputStream(args[i].getBytes()), "string", args, i);
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break;
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case '-':
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processing = false;
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break;
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}
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}
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}
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if (interactive)
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interactiveMode();
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} catch (IOException ioe) {
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System.err.println(ioe.toString());
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System.exit(-2);
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}
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}
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private static void loadLibrary(String libname) throws IOException {
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LuaValue slibname = LuaValue.valueOf(libname);
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try {
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// load via plain require
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globals.get("require").call(slibname);
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} catch (Exception e) {
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try {
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// load as java class
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LuaValue v = (LuaValue) Class.forName(libname).newInstance();
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v.call(slibname, globals);
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} catch (Exception f) {
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throw new IOException("loadLibrary(" + libname + ") failed: " + e + "," + f);
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}
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}
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}
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private static void processScript(InputStream script, String chunkname, String[] args, int firstarg)
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throws IOException {
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try {
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LuaValue c;
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try {
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script = new BufferedInputStream(script);
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c = encoding != null? globals.load(new InputStreamReader(script, encoding), chunkname)
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: globals.load(script, chunkname, "bt", globals);
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} finally {
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script.close();
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}
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if (print && c.isclosure())
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Print.print(c.checkclosure().p);
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Varargs scriptargs = setGlobalArg(chunkname, args, firstarg, globals);
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c.invoke(scriptargs);
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} catch (Exception e) {
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e.printStackTrace(System.err);
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}
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}
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private static Varargs setGlobalArg(String chunkname, String[] args, int i, LuaValue globals) {
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if (args == null)
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return LuaValue.NONE;
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LuaTable arg = LuaValue.tableOf();
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for (int j = 0; j < args.length; j++)
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arg.set(j-i, LuaValue.valueOf(args[j]));
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arg.set(0, LuaValue.valueOf(chunkname));
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arg.set(-1, LuaValue.valueOf("luaj"));
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globals.set("arg", arg);
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return arg.unpack();
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}
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private static void interactiveMode() throws IOException {
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BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
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while ( true ) {
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System.out.print("> ");
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System.out.flush();
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String line = reader.readLine();
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if (line == null)
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return;
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processScript(new ByteArrayInputStream(line.getBytes()), "=stdin", null, 0);
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}
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}
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}
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