Help of the recursive algorithm

Hello world. I'm recursively processing a file XML using ExtendScript. I have a "level" variable, so I can keep track of how deep I am in the structure. I want to detect where the level of change in both senses. I can't find out how to use a variable 'prevLevel' to keep track of its current level, so I can see if it has changed. It seems to work when the level increases, but not when it decreases. Any help would be appreciated. Here is my script. It will ask you an XML file that I'll also post.

main ();

function main () {
    
    var xmlFile, xml;
    
    // Prompt the user for the XML file.
    xmlFile = File.openDialog ("Please select an xml file:","XML:*xml", false);
    if (xmlFile === null) {
        return; // User cancelled the XML dialog box.
    }

    xml = loadXmlFile (xmlFile);
    if (xml === 0) {
        alert ("XML file could not be loaded.");
        return;
    }

    processElements (xml, 1, 0);
}

function processElements (node, level, prevLevel) {
    
    var nodes = node.elements ();
    var count = nodes.length (), i;
    
    for (i = 0; i < count; i += 1) {
        $.writeln (level + " " + nodes[i].localName () + " (" + prevLevel + ")");
        prevLevel = level;
        if (nodes[i].hasComplexContent () === true) {
            processElements (nodes[i], level + 1, prevLevel);
        }
    }
}

function loadXmlFile (xmlFile) {
    
    var xml = 0;

    // Open, read, and close the XML file.
    xmlFile.open("r");
    try {
        xml = new XML(xmlFile.read());
    } catch (e) {
        xmlFile.close();
        return xml;
    }
    xmlFile.close();
    return xml;
}

<?xml version="1.0" encoding="utf-8"?>
<Boek>
  <CursusTitelblad href="C:\temp\Presentatie\CursusTitelblad-1\PresentGBS-StorOndh-CursusVB.xml" />
  <Inhoud />
  <Hoofdstuk>
    <Titelblad href="C:\temp\Presentatie\Hoofdstuk-1\PresentHfst-SignaalgeversVeld.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-1\PresentInlSignaalgevers.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-1\PresentWat zijn Signaalgevers.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-1\PresentSignaalgevrOpnemer.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-1\PresentType signaalgevers.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-1\PresentType opnemers.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-1\PresentTypen signalen.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-1\PresentSpecificatiesDocumentatie.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-1\PresentMetenSignaalgevers-Signalen.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-1\PresentPlaatsing Signaalgevers.xml" />
    <OpgTheorie href="C:\temp\Presentatie\Hoofdstuk-1\PresentOpgTh-SignaalgeversVeld.xml" />
    <OpgTechTake href="C:\temp\Presentatie\Hoofdstuk-1\PresentOpgvTT-SignVerbindingGBSVeld.xml" />
    <PraktijkOpdracht href="C:\temp\Presentatie\Hoofdstuk-1\PresentPrakOpdr-SignaalgeversVeld.xml" />
  </Hoofdstuk>
  <Hoofdstuk>
    <Titelblad href="C:\temp\Presentatie\Hoofdstuk-2\PresentHfst-UitvoerorganenVeld.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-2\PresentInlUitvoerorganen.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-2\PresentSoortenUitvoerorganen.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-2\PresentTypeStuursignalenUitvoerorganen.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-2\PresentSpecificatiesUitvoerorganen.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-2\PresentMetenSignalenUitvoerorganen.xml" />
    <OpgTheorie href="C:\temp\Presentatie\Hoofdstuk-2\PresentOpgTh-UitvoerorganenVeld.xml" />
    <PraktijkOpdracht href="C:\temp\Presentatie\Hoofdstuk-2\PresentPrakOpdr-UitvoerorganenVeld.xml" />
  </Hoofdstuk>
  <Hoofdstuk>
    <Titelblad href="C:\temp\Presentatie\Hoofdstuk-3\PresentHfst-SignaalverbindingGBS.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-3\PresentInlSignaalverbindGBS-Veld.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-3\PresentSoorten I-O-Modulen.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-3\PresentVerbindingenVeldModulen.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-3\PresentVerbindingenModulenOnderling.xml" />
    <OpgTheorie href="C:\temp\Presentatie\Hoofdstuk-3\PresentOpgTh-SignVerbindingGBSVeld.xml" />
    <PraktijkOpdracht href="C:\temp\Presentatie\Hoofdstuk-3\PresentPrakOpdr-SignVerbindingGBSVeld.xml" />
  </Hoofdstuk>
  <Hoofdstuk>
    <Titelblad href="C:\temp\Presentatie\Hoofdstuk-4\PresentHfst-SignaalverbindingenAansluit.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-4\PresentInlSignaalverbindingen.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-4\PresentGebruikSchemaDocumentatie.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-4\PresentHoofd-Stuurstroomschema.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-4\PresentDocumentatieComponenten.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-4\PresentI-O-LijstenSchema.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-4\PresentKlemmenlijst-Rangeren.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-4\PresentMeten I-O-Signalen.xml" />
    <OpgTheorie href="C:\temp\Presentatie\Hoofdstuk-4\PresentOpgvTh-SignVerbindAansluit.xml" />
    <PraktijkOpdracht href="C:\temp\Presentatie\Hoofdstuk-4\PresentPrakOpdr-SignVerbindAansluit.xml" />
  </Hoofdstuk>
  <Hoofdstuk>
    <Titelblad href="C:\temp\Presentatie\Hoofdstuk-5\PresentHfst-CommVerbindingenGBS.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-5\PresentInlCommVerbingenGBS.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-5\PresentTypeCommVerbindingen.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-5\PresentGateways.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-5\PresentAdresbusGBS-systeem.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-5\PresentDataPackets.xml" />
    <OpgTheorie href="C:\temp\Presentatie\Hoofdstuk-5\PresentOpgTh-CommVerbindingenGBS.xml" />
    <PraktijkOpdracht href="C:\temp\Presentatie\Hoofdstuk-5\PresentPrakOpdr-CommVerbindingenGBS.xml" />
  </Hoofdstuk>
  <Hoofdstuk>
    <Titelblad href="C:\temp\Presentatie\Hoofdstuk-6\PresentHfst-GestructureerdSmido.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-6\PresentInlGestrucStorzGBS.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-6\PresentStoringsmeldingKlachtStoring.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-6\PresentStorzoekenSmido.xml" />
    <Onderwerp href="C:\temp\Presentatie\Hoofdstuk-6\PresentGBS-sysGebruikStorzoek.xml" />
  </Hoofdstuk>
</Boek>

The script writes the results in the JavaScript Console. Here are the results I get. It's about what I want, except as the level rises, that it does not appear correctly the previous level.

1 CursusTitelblad (0)

1 content (1)

Hoofdstuk 1 (1)

2 Titelblad (1)

Onderwerp 2 (2)

2 OpgTheorie (2)

2 OpgTechTake (2)

2 PraktijkOpdracht (2)

Hoofdstuk 1 (1)

2 Titelblad (1)

Onderwerp 2 (2)

2 OpgTheorie (2)

2 PraktijkOpdracht (2)

Hoofdstuk 1 (1)

2 Titelblad (1)

Onderwerp 2 (2)

2 OpgTheorie (2)

2 PraktijkOpdracht (2)

Hoofdstuk 1 (1)

2 Titelblad (1)

Onderwerp 2 (2)

2 OpgTheorie (2)

2 PraktijkOpdracht (2)

Hoofdstuk 1 (1)

2 Titelblad (1)

Onderwerp 2 (2)

2 OpgTheorie (2)

2 PraktijkOpdracht (2)

Hoofdstuk 1 (1)

2 Titelblad (1)

Onderwerp 2 (2)

Thus, for example, when he jumps to one of the < Hoofdsuk > elements, I see this:

Hoofdstuk 1 (1)

Instead of

Hoofdstuk 1 (2)

-Rick

No doubt you waited until prevLevel is released "by reference" in recursion, which is true for objects, but not for simple variables.

It should work when you set prevLevel as an object:

function main () {  

    var xmlFile, xml;  

    // Prompt the user for the XML file.
    xmlFile = File.openDialog ("Please select an xml file:","XML:*xml", false);
    if (xmlFile === null) {
        return; // User cancelled the XML dialog box.
    }  

    xml = loadXmlFile (xmlFile);
    if (xml === 0) {
        alert ("XML file could not be loaded.");
        return;
    }  

    var prevLevel = { val : 0 };  // CHANGED
    processElements (xml, 1, prevLevel);
}  

function processElements (node, level, prevLevel) {  

    var nodes = node.elements ();
    var count = nodes.length (), i;  

    for (i = 0; i < count; i += 1) {
        $.writeln (level + " " + nodes[i].localName () + " (" + prevLevel.val + ")");  // CHANGED
        prevLevel.val = level;    // CHANGED
        if (nodes[i].hasComplexContent () === true) {
            processElements (nodes[i], level + 1, prevLevel);
        }
    }
}

Tags: Adobe FrameMaker

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);
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---------- ---------- ---------- ---------- ----------
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--------------------------------------------------
2 2 1 2 ROLL
--------------------------------------------------
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10 6 2 6 LOAD
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11 6 2 6.1 FLATTEN
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12 7 1 7 RELOAD
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13 7 1 1 APPROVAL
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This sounds like a job for the analytical LAST_VALUE function:

SELECT col_pk

LAST_VALUE (fins IGNORE NULLS)

COURSES (ORDER BY col_pk) AS fins2

LAST_VALUE (fo_fv IGNORE NULLS)

COURSES (ORDER BY col_pk) AS fo_fv2

jup_fv

action

OF the test

ORDER BY col_pk

;

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---------- ---------- ---------- ---------- ----------

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