/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * The contents of this file are subject to the Netscape 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/NPL/
 *
 * 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.
 *
 * The Original Code is Rhino code, released
 * May 6, 1999.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1997-2000 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s):
 * Igor Bukanov
 * Roger Lawrence
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU Public License (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 NPL, indicate your decision by
 * deleting the provisions above and replace 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 NPL or the GPL.
 */

package org.mozilla.javascript;

import org.mozilla.javascript.debug.DebuggableScript;

final class InterpretedFunction extends NativeFunction implements Script
{
    static final long serialVersionUID = 541475680333911468L;

    InterpreterData idata;
    SecurityController securityController;
    Object securityDomain;
    Scriptable[] functionRegExps;

    private InterpretedFunction(InterpreterData idata,
                                Object staticSecurityDomain)
    {
        this.idata = idata;

        // Always get Context from the current thread to
        // avoid security breaches via passing mangled Context instances
        // with bogus SecurityController
        Context cx = Context.getContext();
        SecurityController sc = cx.getSecurityController();
        Object dynamicDomain;
        if (sc != null) {
            dynamicDomain = sc.getDynamicSecurityDomain(staticSecurityDomain);
        } else {
            if (staticSecurityDomain != null) {
                throw new IllegalArgumentException();
            }
            dynamicDomain = null;
        }

        this.securityController = sc;
        this.securityDomain = dynamicDomain;
    }

    private InterpretedFunction(InterpretedFunction parent, int index)
    {
        this.idata = parent.idata.itsNestedFunctions[index];
        this.securityController = parent.securityController;
        this.securityDomain = parent.securityDomain;
    }

    /**
     * Create script from compiled bytecode.
     */
    static InterpretedFunction createScript(InterpreterData idata,
                                            Object staticSecurityDomain)
    {
        InterpretedFunction f;
        f = new InterpretedFunction(idata, staticSecurityDomain);
        return f;
    }

    /**
     * Create function compiled from Function(...) constructor.
     */
    static InterpretedFunction createFunction(Context cx,Scriptable scope,
                                              InterpreterData idata,
                                              Object staticSecurityDomain)
    {
        InterpretedFunction f;
        f = new InterpretedFunction(idata, staticSecurityDomain);
        f.initInterpretedFunction(cx, scope);
        return f;
    }

    /**
     * Create function embedded in script or another function.
     */
    static InterpretedFunction createFunction(Context cx, Scriptable scope,
                                              InterpretedFunction  parent,
                                              int index)
    {
        InterpretedFunction f = new InterpretedFunction(parent, index);
        f.initInterpretedFunction(cx, scope);
        return f;
    }

    Scriptable[] createRegExpWraps(Context cx, Scriptable scope)
    {
        if (idata.itsRegExpLiterals == null) Kit.codeBug();

        RegExpProxy rep = ScriptRuntime.checkRegExpProxy(cx);
        int N = idata.itsRegExpLiterals.length;
        Scriptable[] array = new Scriptable[N];
        for (int i = 0; i != N; ++i) {
            array[i] = rep.wrapRegExp(cx, scope, idata.itsRegExpLiterals[i]);
        }
        return array;
    }

    private void initInterpretedFunction(Context cx, Scriptable scope)
    {
        initScriptFunction(cx, scope);
        if (idata.itsRegExpLiterals != null) {
            functionRegExps = createRegExpWraps(cx, scope);
        }
    }

    public String getFunctionName()
    {
        return (idata.itsName == null) ? "" : idata.itsName;
    }

    public Object call(Context cx, Scriptable scope, Scriptable thisObj,
                       Object[] args)
    {
        if (!ScriptRuntime.hasTopCall(cx)) {
            return ScriptRuntime.doTopCall(this, cx, scope, thisObj, args);
        }
        return Interpreter.interpret(this, cx, scope, thisObj, args);
    }

    public Object exec(Context cx, Scriptable scope)
    {
        if (idata.itsFunctionType != 0) {
            // Can only be applied to scripts
            throw new IllegalStateException();
        }
        if (!ScriptRuntime.hasTopCall(cx)) {
            // It will go through "call" path. but they are equivalent
            return ScriptRuntime.doTopCall(
                this, cx, scope, scope, ScriptRuntime.emptyArgs);
        }
        return Interpreter.interpret(
            this, cx, scope, scope, ScriptRuntime.emptyArgs);
    }

    public String getEncodedSource()
    {
        return Interpreter.getEncodedSource(idata);
    }

    public DebuggableScript getDebuggableView()
    {
        return idata;
    }

    protected int getLanguageVersion()
    {
        return idata.languageVersion;
    }

    protected int getParamCount()
    {
        return idata.argCount;
    }

    protected int getParamAndVarCount()
    {
        return idata.argNames.length;
    }

    protected String getParamOrVarName(int index)
    {
        return idata.argNames[index];
    }

}

