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/*******************************************************************************
* Copyright (c) 2013 LuaJ. All rights reserved.
*
* 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.
******************************************************************************/
package org.luaj.vm2.script;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.Reader;
import java.io.Writer;

import javax.script.ScriptContext;
import javax.script.SimpleScriptContext;

import org.luaj.vm2.Globals;
import org.luaj.vm2.lib.jse.JsePlatform;
import org.luaj.vm2.luajc.LuaJC;

/** 
 * Context for LuaScriptEngine execution which maintains its own Globals, 
 * and manages the input and output redirection.
 */
public class LuajContext extends SimpleScriptContext implements ScriptContext {

	/** Globals for this context instance. */
	public final Globals globals;

	/** The initial value of globals.STDIN */
	private final InputStream stdin;
	/** The initial value of globals.STDOUT */
	private final PrintStream stdout;
	/** The initial value of globals.STDERR */
	private final PrintStream stderr;
	
	/** Construct a LuajContext with its own globals which may
	 * be debug globals depending on the value of the system
	 * property 'org.luaj.debug'
	 * 

* If the system property 'org.luaj.debug' is set, the globals * created will be a debug globals that includes the debug * library. This may provide better stack traces, but may * have negative impact on performance. */ public LuajContext() { this("true".equals(System.getProperty("org.luaj.debug")), "true".equals(System.getProperty("org.luaj.luajc"))); } /** Construct a LuajContext with its own globals, which * which optionally are debug globals, and optionally use the * luajc direct lua to java bytecode compiler. *

* If createDebugGlobals is set, the globals * created will be a debug globals that includes the debug * library. This may provide better stack traces, but may * have negative impact on performance. * @param createDebugGlobals true to create debug globals, * false for standard globals. * @param useLuaJCCompiler true to use the luajc compiler, * reqwuires bcel to be on the class path. */ public LuajContext(boolean createDebugGlobals, boolean useLuaJCCompiler) { globals = createDebugGlobals? JsePlatform.debugGlobals(): JsePlatform.standardGlobals(); if (useLuaJCCompiler) LuaJC.install(globals); stdin = globals.STDIN; stdout = globals.STDOUT; stderr = globals.STDERR; } @Override public void setErrorWriter(Writer writer) { globals.STDERR = writer != null? new PrintStream(new WriterOutputStream(writer)): stderr; } @Override public void setReader(Reader reader) { globals.STDIN = reader != null? new ReaderInputStream(reader): stdin; } @Override public void setWriter(Writer writer) { globals.STDOUT = writer != null? new PrintStream(new WriterOutputStream(writer)): stdout; } static final class WriterOutputStream extends OutputStream { final Writer w; WriterOutputStream(Writer w) { this.w = w; } public void write(int b) throws IOException { w.write(b); } } static final class ReaderInputStream extends InputStream { final Reader r; ReaderInputStream(Reader r) { this.r = r; } public int read() throws IOException { return r.read(); } } }





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