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Blazingly fast Minecraft world manipulation for artists, builders and everyone else.

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/*
 * WorldEdit, a Minecraft world manipulation toolkit
 * Copyright (C) sk89q 
 * Copyright (C) WorldEdit team and contributors
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package com.sk89q.worldedit.scripting;

import com.sk89q.worldedit.WorldEditException;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.ImporterTopLevel;
import org.mozilla.javascript.JavaScriptException;
import org.mozilla.javascript.RhinoException;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.WrappedException;

import javax.script.ScriptException;
import java.util.Map;

public class RhinoCraftScriptEngine implements CraftScriptEngine {

    private int timeLimit;

    @Override
    public int getTimeLimit() {
        return timeLimit;
    }

    @Override
    public void setTimeLimit(int milliseconds) {
        timeLimit = milliseconds;
    }

    @Override
    public Object evaluate(String script, String filename, Map args)
            throws Throwable {
        RhinoContextFactory factory = new RhinoContextFactory(timeLimit);
        Context cx = factory.enterContext();
        cx.setClassShutter(new MinecraftHidingClassShutter());
        ScriptableObject scriptable = new ImporterTopLevel(cx);
        Scriptable scope = cx.initStandardObjects(scriptable);

        for (Map.Entry entry : args.entrySet()) {
            ScriptableObject.putProperty(scope, entry.getKey(),
                    Context.javaToJS(entry.getValue(), scope)
            );
        }
        try {
            return cx.evaluateString(scope, script, filename, 1, null);
        } catch (Error e) {
            throw new ScriptException(e.getMessage());
        } catch (RhinoException e) {
            if (e instanceof WrappedException) {
                Throwable cause = e.getCause();
                if (cause instanceof WorldEditException) {
                    throw cause;
                }
            }

            String msg;
            int line = (line = e.lineNumber()) == 0 ? -1 : line;

            if (e instanceof JavaScriptException) {
                msg = String.valueOf(((JavaScriptException) e).getValue());
            } else {
                msg = e.getMessage();
            }

            ScriptException scriptException =
                    new ScriptException(msg, e.sourceName(), line);
            scriptException.initCause(e);

            throw scriptException;
        } finally {
            Context.exit();
        }
    }

}