Initial pass at JSR 223 pluggable scripting engne.
This commit is contained in:
James Roseborough
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org.luaj.script.LuaScriptEngineFactory
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234
src/script/org/luaj/script/LuaScriptEngine.java
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234
src/script/org/luaj/script/LuaScriptEngine.java
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/*******************************************************************************
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* Copyright (c) 2008 LuaJ. 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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package org.luaj.script;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.LineNumberInputStream;
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import java.io.Reader;
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import java.io.StringWriter;
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import javax.script.Bindings;
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import javax.script.ScriptContext;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineFactory;
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import javax.script.ScriptException;
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import javax.script.SimpleBindings;
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import javax.script.SimpleScriptContext;
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import org.luaj.compiler.LuaC;
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import org.luaj.platform.J2sePlatform;
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import org.luaj.vm.LClosure;
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import org.luaj.vm.LDouble;
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import org.luaj.vm.LFunction;
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import org.luaj.vm.LInteger;
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import org.luaj.vm.LPrototype;
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import org.luaj.vm.LString;
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import org.luaj.vm.LTable;
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import org.luaj.vm.LUserData;
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import org.luaj.vm.LValue;
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import org.luaj.vm.LoadState;
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import org.luaj.vm.Lua;
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import org.luaj.vm.LuaErrorException;
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import org.luaj.vm.LuaState;
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import org.luaj.vm.Platform;
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/**
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*
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* @author jim_roseborough
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*/
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public class LuaScriptEngine extends LFunction implements ScriptEngine {
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private static final String __ENGINE_VERSION__ = "V0.28";
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private static final String __NAME__ = "Luaj";
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private static final String __SHORT_NAME__ = "Luaj";
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private static final String __LANGUAGE__ = "lua";
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private static final String __LANGUAGE_VERSION__ = "5.1";
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private static final String __ARGV__ = "arg";
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private static final String __FILENAME__ = "?";
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static {
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Platform.setInstance(new J2sePlatform());
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LuaC.install();
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}
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private static final ScriptEngineFactory myFactory = new LuaScriptEngineFactory();
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private ScriptContext defaultContext;
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private final LuaState luaState;
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public LuaScriptEngine() {
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setContext(new SimpleScriptContext());
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// set special values
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put(LANGUAGE_VERSION, __LANGUAGE_VERSION__);
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put(LANGUAGE, __LANGUAGE__);
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put(ENGINE, __NAME__);
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put(ENGINE_VERSION, __ENGINE_VERSION__);
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put(ARGV, __ARGV__);
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put(FILENAME, __FILENAME__);
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put(NAME, __SHORT_NAME__);
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put("THREADING", null);
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// set lua state
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luaState = Platform.getInstance().newLuaState();
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// connect up to bindings
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LTable metatable = new LTable();
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metatable.put("__index", this);
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metatable.put("__newindex", this);
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luaState._G.luaSetMetatable(metatable);
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}
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public Object eval(String script) throws ScriptException {
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return eval(script, getContext());
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}
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public Object eval(String script, ScriptContext context) throws ScriptException {
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try {
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byte[] bytes = script.getBytes("UTF-8");
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ByteArrayInputStream bais = new ByteArrayInputStream( bytes );
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LineNumberInputStream is = new LineNumberInputStream( bais );
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try {
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LPrototype p = LoadState.undump(luaState, is, "script");
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LClosure c = new LClosure( p, luaState._G );
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luaState.doCall( c, new LValue[0] );
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return luaState.topointer(1);
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} catch ( LuaErrorException lee ) {
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throw new ScriptException(lee.getMessage(), "script", is.getLineNumber() );
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} finally {
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is.close();
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}
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} catch ( Throwable t ) {
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throw new ScriptException("eval threw "+t.toString());
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}
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}
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public Object eval(String script, Bindings bindings) throws ScriptException {
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Bindings current = getContext().getBindings(ScriptContext.ENGINE_SCOPE);
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getContext().setBindings(bindings, ScriptContext.ENGINE_SCOPE);
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Object result = eval(script);
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getContext().setBindings(current, ScriptContext.ENGINE_SCOPE);
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return result;
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}
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public Object eval(Reader reader) throws ScriptException {
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return eval(getScriptFromReader(reader));
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}
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public Object eval(Reader reader, ScriptContext scriptContext) throws ScriptException {
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return eval(getScriptFromReader(reader), scriptContext);
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}
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public Object eval(Reader reader, Bindings bindings) throws ScriptException {
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return eval(getScriptFromReader(reader), bindings);
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}
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public void put(String key, Object value) {
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Bindings b = getBindings(ScriptContext.ENGINE_SCOPE);
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if ( value == null )
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b.remove(key);
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else {
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if ( value instanceof Number ) {
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double d = ((Number)value).doubleValue();
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int id = (int) d;
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value = (d==id? LInteger.valueOf(id): new LDouble(d));
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} else if ( value instanceof String ) {
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value = LString.valueOf(value.toString());
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} else {
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value = new LUserData(value);
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}
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b.put(key,value);
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}
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}
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public Object get(String key) {
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Bindings b = getBindings(ScriptContext.ENGINE_SCOPE);
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Object o = b.get(key);
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if ( o == null )
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return null;
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LValue v = (LValue)o;
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switch ( v.luaGetType() ) {
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case Lua.LUA_TSTRING: return v.toJavaString();
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case Lua.LUA_TUSERDATA: return v.toJavaInstance();
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case Lua.LUA_TNUMBER: return v.isInteger()? (Object) v.toJavaBoxedInteger(): (Object) v.toJavaBoxedDouble();
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}
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return o;
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}
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public void luaSetTable(LuaState vm, LValue table, LValue key, LValue val) {
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Bindings b = getBindings(ScriptContext.ENGINE_SCOPE);
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String k = key.toJavaString();
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Object v = (val.isNil()? null: val);
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b.put(k,v);
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}
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public void luaGetTable(LuaState vm, LValue table, LValue key) {
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Bindings b = getBindings(ScriptContext.ENGINE_SCOPE);
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String k = key.toJavaString();
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Object v = b.get(k);
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vm.pushlvalue((LValue)v);
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}
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public Bindings getBindings(int scope) {
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return getContext().getBindings(scope);
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}
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public void setBindings(Bindings bindings, int scope) {
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getContext().setBindings(bindings, scope);
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}
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public Bindings createBindings() {
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return new SimpleBindings();
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}
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public ScriptContext getContext() {
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return defaultContext;
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}
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public void setContext(ScriptContext context) {
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defaultContext = context;
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}
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public ScriptEngineFactory getFactory() {
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return myFactory;
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}
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/*
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* private methods
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*/
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private static String getScriptFromReader(Reader reader) {
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try {
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StringWriter script = new StringWriter();
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int data;
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while ((data = reader.read()) != -1) {
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script.write(data);
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}
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script.flush();
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return script.toString();
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} catch (IOException ex) {
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}
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return null;
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}
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}
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127
src/script/org/luaj/script/LuaScriptEngineFactory.java
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127
src/script/org/luaj/script/LuaScriptEngineFactory.java
Normal file
@@ -0,0 +1,127 @@
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/*******************************************************************************
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* Copyright (c) 2008 LuaJ. 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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package org.luaj.script;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineFactory;
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/**
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*
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* @author jim_roseborough
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*/
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public class LuaScriptEngineFactory implements ScriptEngineFactory {
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private static final String FILEEXT = ".lua";
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private static final String [] MIMETYPES = {
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"text/plain",
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"text/lua",
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"application/lua"
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};
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private static final String [] NAMES = {
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"lua",
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"luaj",
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};
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private ScriptEngine myScriptEngine;
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private List<String> extensions;
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private List<String> mimeTypes;
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private List<String> names;
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public LuaScriptEngineFactory() {
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myScriptEngine = new LuaScriptEngine();
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extensions = Collections.nCopies(1, FILEEXT);
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mimeTypes = Arrays.asList(MIMETYPES);
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names = Arrays.asList(NAMES);
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}
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public String getEngineName() {
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return getScriptEngine().get(ScriptEngine.ENGINE).toString();
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}
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public String getEngineVersion() {
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return getScriptEngine().get(ScriptEngine.ENGINE_VERSION).toString();
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}
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public List<String> getExtensions() {
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return extensions;
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}
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public List<String> getMimeTypes() {
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return mimeTypes;
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}
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public List<String> getNames() {
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return names;
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}
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public String getLanguageName() {
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return getScriptEngine().get(ScriptEngine.LANGUAGE).toString();
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}
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public String getLanguageVersion() {
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return getScriptEngine().get(ScriptEngine.LANGUAGE_VERSION).toString();
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}
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public Object getParameter(String key) {
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return getScriptEngine().get(key).toString();
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}
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public String getMethodCallSyntax(String obj, String m, String... args) {
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StringBuffer sb = new StringBuffer();
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sb.append(obj + ":" + m + "(");
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int len = args.length;
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for (int i = 0; i < len; i++) {
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if (i > 0) {
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sb.append(',');
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}
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sb.append(args[i]);
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}
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sb.append(")");
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return sb.toString();
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}
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public String getOutputStatement(String toDisplay) {
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return "print(" + toDisplay + ")";
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}
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public String getProgram(String ... statements) {
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StringBuffer sb = new StringBuffer();
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int len = statements.length;
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for (int i = 0; i < len; i++) {
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if (i > 0) {
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sb.append('\n');
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}
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sb.append(statements[i]);
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}
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return sb.toString();
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}
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public ScriptEngine getScriptEngine() {
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return myScriptEngine;
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}
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}
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62
src/script/org/luaj/script/ScriptEngineSample.java
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62
src/script/org/luaj/script/ScriptEngineSample.java
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@@ -0,0 +1,62 @@
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/*******************************************************************************
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* Copyright (c) 2008 LuaJ. All rights reserved.
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*
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||||
* 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.
|
||||
******************************************************************************/
|
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package org.luaj.script;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineFactory;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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public class ScriptEngineSample {
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public static void main(String [] args) {
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ScriptEngineManager sem = new ScriptEngineManager();
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ScriptEngine e = sem.getEngineByExtension(".lua");
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ScriptEngineFactory f = e.getFactory();
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String engineName = f.getEngineName();
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String engineVersion = f.getEngineVersion();
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String langName = f.getLanguageName();
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String langVersion = f.getLanguageVersion();
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System.out.println(engineName + " " +
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engineVersion + " " +
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langName + " " +
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langVersion);
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String statement = f.getOutputStatement("\"hello, world\"");
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System.out.println(statement);
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try {
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e.eval(statement);
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e.put("x", 25);
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e.eval("y = math.sqrt(x)");
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System.out.println( "y="+e.get("y") );
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e.put("x", 2);
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e.eval("y = math.sqrt(x)");
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System.out.println( "y="+e.get("y") );
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e.eval("\n\nbogus example\n\n");
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} catch (ScriptException ex) {
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ex.printStackTrace();
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}
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}
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}
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Reference in New Issue
Block a user