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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.
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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * Contributor(s):
 *   Norris Boyd
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License Version 2 or later (the "GPL"), in which
 * case the provisions of the GPL are applicable instead of those above. If
 * you wish to allow use of your version of this file only under the terms of
 * the GPL and not to allow others to use your version of this file under the
 * MPL, indicate your decision by deleting the provisions above and replacing
 * them with the notice and other provisions required by the GPL. If you do
 * not delete the provisions above, a recipient may use your version of this
 * file under either the MPL or the GPL.
 *
 * ***** END LICENSE BLOCK ***** */

package org.mozilla.javascript;

import java.util.List;

/**
 * Abstraction of evaluation, which can be implemented either by an
 * interpreter or compiler.
 */
public interface Evaluator {

    /**
     * Compile the script or function from intermediate representation
     * tree into an executable form.
     *
     * @param compilerEnv Compiler environment
     * @param tree intermediate representation
     * @param encodedSource encoding of the source code for decompilation
     * @param returnFunction if true, compiling a function
     * @return an opaque object that can be passed to either
     *         createFunctionObject or createScriptObject, depending on the
     *         value of returnFunction
     */
    public Object compile(CompilerEnvirons compilerEnv,
                      ScriptOrFnNode tree,
                      String encodedSource,
                      boolean returnFunction);

    /**
     * Create a function object.
     *
     * @param cx Current context
     * @param scope scope of the function
     * @param bytecode opaque object returned by compile
     * @param staticSecurityDomain security domain
     * @return Function object that can be called
     */
    public Function createFunctionObject(Context cx, Scriptable scope,
            Object bytecode, Object staticSecurityDomain);

    /**
     * Create a script object.
     *
     * @param bytecode opaque object returned by compile
     * @param staticSecurityDomain security domain
     * @return Script object that can be evaluated
     */
    public Script createScriptObject(Object bytecode,
                                     Object staticSecurityDomain);

    /**
     * Capture stack information from the given exception.
     * @param ex an exception thrown during execution
     */
    public void captureStackInfo(RhinoException ex);

    /**
     * Get the source position information by examining the stack.
     * @param cx Context
     * @param linep Array object of length >= 1; getSourcePositionFromStack
     *              will assign the line number to linep[0].
     * @return the name of the file or other source container
     */
    public String getSourcePositionFromStack(Context cx, int[] linep);

    /**
     * Given a native stack trace, patch it with script-specific source
     * and line information
     * @param ex exception
     * @param nativeStackTrace the native stack trace
     * @return patched stack trace
     */
    public String getPatchedStack(RhinoException ex,
                                  String nativeStackTrace);

    /**
     * Get the script stack for the given exception
     * @param ex exception from execution
     * @return list of strings for the stack trace
     */
    public List getScriptStack(RhinoException ex);

    /**
     * Mark the given script to indicate it was created by a call to
     * eval() or to a Function constructor.
     * @param script script to mark as from eval
     */
    public void setEvalScriptFlag(Script script);
}