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There is a newer version: 3.0.4
/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2011-2016 Incapture Technologies LLC
 *
 * 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 reflex;

import reflex.debug.IReflexDebugger;
import reflex.debug.NullDebugger;
import reflex.node.ReflexNode;
import reflex.util.function.LanguageRegistry;
import reflex.value.ReflexValue;

/**
 * Handles a reflex REPL
 * 
 * @author amkimian
 * 
 */
public class ReflexREPL {
    private IReflexHandler handler;
    private StringBuilder currentLine = new StringBuilder();
    private Scope scope = Scope.getInitialScope();
    private IReflexDebugger debugger = new NullDebugger();
    private LanguageRegistry savedRegistry = null;

    public ReflexREPL(IReflexHandler handler) {
        this.handler = handler;
    }

    public ReflexValue processLine(String line) {
        line = line.trim();
        if (line.endsWith("\\")) {
            currentLine.append(line.substring(0, line.length() - 1));
            currentLine.append("\n");
            return new ReflexValue(">");
        } else if (!line.endsWith(";") && !line.endsWith("end") && !line.endsWith("}")) {
            line = line + ";";
        }
        currentLine.append(line);
        try {
            ReflexTreeWalker walker = ReflexExecutor.getWalkerForProgramWithRegistry(savedRegistry, currentLine.toString(), handler);
            if (handler != null) {
                walker.setReflexHandler(handler);
            }
            ReflexNode returned = walker.walk();
            ReflexValue val = returned.evaluate(debugger, scope);
            savedRegistry = walker.languageRegistry;
            return val;
        } catch (Exception e) {
            e.printStackTrace();
            return new ReflexValue(e.getMessage());
        } finally {
            currentLine.setLength(0);
        }
    }

    public Scope getScope() {
        return scope;
    }
}