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PHPJavaBridge server (soluble fork)
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/*-*- mode: Java; tab-width:8 -*-*/

package io.soluble.pjb.script;

/*
 * Copyright (C) 2003-2007 Jost Boekemeier
 *
 * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
 */

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.Writer;

import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptException;

import io.soluble.pjb.bridge.Util;
import io.soluble.pjb.bridge.http.IContext;

/**
 * This class implements the ScriptEngine.
 * Example:
 * 
 * ScriptEngine e = (new ScriptEngineManager()).getEngineByName("php");

 * try { e.eval(<?php foo() ?>"); } catch (ScriptException e) { ... }

 * 
 *
 * @author jostb
 */
public class PhpScriptEngine extends AbstractPhpScriptEngine {

    /**
     * Create a new ScriptEngine with a default context.
     */
    public PhpScriptEngine() {
        super(new PhpScriptEngineFactory());
    }

    /**
     * Create a new ScriptEngine from a factory.
     *
     * @param factory The factory
     * @see #getFactory()
     */
    public PhpScriptEngine(PhpScriptEngineFactory factory) {
        super(factory);
    }

    /**
     * Create a new ScriptEngine with bindings.
     *
     * @param n the bindings
     */
    public PhpScriptEngine(Bindings n) {
        this();
        setBindings(n, ScriptContext.ENGINE_SCOPE);
    }

    protected Reader getLocalReader(Reader reader, boolean embedJavaInc) throws IOException {
        /* header: /JavaBridge/java/Java.inc"); ?> */
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        Writer w = new OutputStreamWriter(out);
        try {
            Reader localReader = null;
            char[] buf = new char[Util.BUF_SIZE];
            int c;
            String stdHeader = embedJavaInc ? null : ((IContext) getContext()).getRedirectURL("/JavaBridge");
            localReader = new StringReader(getStandardHeader(stdHeader));

            while ((c = localReader.read(buf)) > 0) w.write(buf, 0, c);
            localReader.close();
            localReader = null;

	    /* the script: */
            while ((c = reader.read(buf)) > 0) w.write(buf, 0, c);
            w.close();
            w = null;
        
	    /* now evaluate our script */
            localReader = new InputStreamReader(new ByteArrayInputStream(out.toByteArray()));
            return localReader;
        } finally {
            if (w != null) try {
                w.close();
            } catch (IOException e) {/*ignore*/}
        }
    }

    protected Object doEvalPhp(Reader reader, ScriptContext context) throws ScriptException {
        if ((continuation != null) || (reader == null)) release();
        if (reader == null) return null;

        setNewContextFactory();
        Reader localReader = null;

        try {
            localReader = getLocalReader(reader, false);
            this.script = doEval(localReader, context);
        } catch (Exception e) {
            Util.printStackTrace(e);
            if (e instanceof RuntimeException) throw (RuntimeException) e;
            if (e instanceof ScriptException) throw (ScriptException) e;
            throw new ScriptException(e);
        } finally {
            if (localReader != null) try {
                localReader.close();
            } catch (IOException e) {/*ignore*/}

            // release the engine, so that any error reported by the script can trigger a Java exception
            release();
        }

        return resultProxy;
    }

    protected Object doEvalCompiledPhp(Reader reader, ScriptContext context) throws ScriptException {
        if ((continuation != null) || (reader == null)) release();
        if (reader == null) return null;

        setNewContextFactory();
        try {
            this.script = doEval(reader, context);
        } catch (Exception e) {
            Util.printStackTrace(e);
            if (e instanceof RuntimeException) throw (RuntimeException) e;
            if (e instanceof ScriptException) throw (ScriptException) e;
            throw new ScriptException(e);
        } finally {

            // release the engine, so that any error reported by the script can trigger a Java exception
            release();
        }

        return resultProxy;
    }
}