/*

    File:       SVAERevert.c

    Contains:   

    Written by: Original version by Jon Lansdell and Nigel Humphreys.

                3.1 updates by Greg Sutton.

    Copyright:  Copyright © 1995-1999 by Apple Computer, Inc., All Rights Reserved.

                You may incorporate this Apple sample source code into your program(s) without

                restriction. This Apple sample source code has been provided "AS IS" and the

                responsibility for its operation is yours. You are not permitted to redistribute

                this Apple sample source code as "Apple sample source code" after having made

                changes. If you're going to re-distribute the source, we require that you make

                it clear in the source that the code was descended from Apple sample source

                code, but that you've made changes.

    Change History (most recent first):

                7/20/1999   Karl Groethe    Updated for Metrowerks Codewarror Pro 2.1

*/

#include "SVAERevert.h"

#include "SVEditWindow.h"       // for DPtrFromWindowPtr()

#include "SVEditFile.h"

#include "SVEditAEUtils.h"

#include "SVAETextUtils.h"

#include "SVAEAccessors.h"

#include "SVAEDelete.h"

#pragma segment File

// -----------------------------------------------------------------------

//  Name:       DoRevert

//  Purpose:    Handles the Revert AppleEvent.

// -----------------------------------------------------------------------

pascal OSErr DoRevert(const AppleEvent  *theAppleEvent,

                            AppleEvent  *reply,

                            long        handlerRefCon)

{ 

#pragma unused (reply, handlerRefCon)

    AEDesc          directObj = {typeNull, NULL};

    WindowToken     aWindowToken;

    OSErr           err;

        // pick up the direct object

    err = AEGetParamDesc(theAppleEvent,  keyDirectObject, typeWildCard, &directObj);

    err = GotRequiredParams(theAppleEvent);

    if (noErr != err) goto done;

    if (typeNull != directObj.descriptorType)

        err = RevertDesc(&directObj);

    else if (FrontWindow())                     // If no direct object given, default

    {                                           // to the front window.

        aWindowToken.tokenWindow = FrontWindow();

        err = RevertWindowToken(&aWindowToken);

    }

    else

        err = errAENoSuchObject;

done:

    if (directObj.dataHandle) 

        AEDisposeDesc(&directObj);

    return(err);

} // DoRevertWindow

OSErr    RevertWindowToken(WindowToken* theToken)

{

    DPtr            docPtr;

    TextToken       aTextToken;

    OSErr           err;

    docPtr = DPtrFromWindowPtr(theToken->tokenWindow);

    if (! docPtr)

        return(errAENoSuchObject);

                        // Get a token for all the text in the window

    err = TextTokenFromWindowToken(theToken, &aTextToken);

    if (noErr != err) goto done;

                        // Delete all the text

    err = DeleteTextToken(&aTextToken);

    if (noErr != err) goto done;

    if (docPtr->everSaved) 

    {

        err = GetFileContents(docPtr->theFSSpec, docPtr);

        if (noErr != err) goto done;

        DoResizeWindow(docPtr);

        docPtr->dirty = false;

    }

    DoUpdate(docPtr->theWindow);

done:

    return(err);

}

OSErr   RevertWindowDesc(AEDesc* windowDesc)

{

    WindowToken     aWindowToken;

    Size            actualSize;

    OSErr           err;

    if (typeMyWndw != windowDesc->descriptorType)

        return(errAETypeError);

    GetRawDataFromDescriptor(windowDesc, (Ptr)&aWindowToken, sizeof(aWindowToken), &actualSize);

    err = RevertWindowToken(&aWindowToken);

    return(err);

}

OSErr   RevertDesc(AEDesc* aDesc)

{

    AEDesc      revertDesc = {typeNull, NULL},

                windowDesc = {typeNull, NULL},

                itemDesc = {typeNull, NULL};

    long        itemCount,

                index;

    DescType    theAEKeyword;

    OSErr       err;

    if (typeObjectSpecifier == aDesc->descriptorType)

        err = AEResolve(aDesc, kAEIDoMinimum, &revertDesc);

    else

        err = AEDuplicateDesc(aDesc, &revertDesc);

    if (noErr != err) goto done;

    switch (revertDesc.descriptorType)

    {

        case typeAEList:

            err = AECountItems(&revertDesc, &itemCount);

            if (noErr != err) goto done;

            for (index = 1; index <= itemCount; index++)    // Do front back order

            {

                err = AEGetNthDesc(&revertDesc, index, typeWildCard, &theAEKeyword, &itemDesc);

                if (noErr != err) goto done;

                err = RevertDesc(&itemDesc);    // Call recursively

                if (noErr != err) goto done;

                if (itemDesc.dataHandle)

                    AEDisposeDesc(&itemDesc);

            }

            break;

        default:

            err = AECoerceDesc(&revertDesc, typeMyWndw, &windowDesc);

            if (noErr != err) goto done;

            err = RevertWindowDesc(&windowDesc);

    }

done:

    if (revertDesc.dataHandle)

        AEDisposeDesc(&revertDesc);

    if (windowDesc.dataHandle)

        AEDisposeDesc(&windowDesc);

    if (itemDesc.dataHandle)

        AEDisposeDesc(&itemDesc);

    return(err);

}