Initial sources for planned 2.0 luaj vm release. Most interpreter features and library functions working.
This commit is contained in:
James Roseborough
199
src/jse/lua.java
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199
src/jse/lua.java
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/*******************************************************************************
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* Copyright (c) 2009 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.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 org.luaj.vm2.LoadState;
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import org.luaj.vm2.Lua;
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import org.luaj.vm2.LuaClosure;
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import org.luaj.vm2.LuaValue;
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import org.luaj.vm2.Prototype;
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import org.luaj.vm2.compiler.LuaC;
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import org.luaj.vm2.lib.DebugLib;
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import org.luaj.vm2.lib.JsePlatform;
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/**
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* lua command for use in java se 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) 2009 Luaj.org.org";
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private static final String usage =
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"usage: java -cp luaj-jse.jar lua [options] [script [args]].\n" +
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"Available options are:\n" +
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" -e stat execute string 'stat'\n" +
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" -l name require library 'name'\n" +
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" -i enter interactive mode after executing 'script'\n" +
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" -v show version information\n" +
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" -- 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 LuaValue _G;
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public static void main( String[] args ) throws IOException {
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// new lua state
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LuaC.install();
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_G = JsePlatform.standardGlobals();
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DebugLib.install( _G );
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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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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 'l':
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if ( ++i >= args.length )
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usageExit();
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loadLibrary( 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 '-':
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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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// 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+1 );
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break;
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} else if ( args[i].length() <= 1 ) {
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processScript( System.in, "-", args, i+1 );
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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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++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()), args[i], null, 0 );
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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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_G.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.setfenv(_G);
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v.call(slibname, _G);
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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 offset ) throws IOException {
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try {
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LuaClosure c;
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try {
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Prototype p = LoadState.undump(script, chunkname );
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c = new LuaClosure(p,_G);
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} finally {
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script.close();
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}
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LuaValue[] a = new LuaValue[args.length-offset];
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for ( int i=0; i<a.length; i++ )
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a[i] = LuaValue.valueOf(args[offset+i]);
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c.invoke( a );
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} catch ( Throwable t ) {
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t.printStackTrace( System.err );
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}
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}
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private static final String[] NOARGS = {};
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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()), "-", NOARGS, 0 );
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}
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}
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}
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