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xquery version "3.1";

(:~
 : This modules handles the conversion of the Fontante-TEI/XML into TEI simplePrint
 : for the edited text. The resulting TEI simplePrint is the basis for the "Editerter
 : Text" (edited text) view on the website and the book. It represents the latest
 : layer of text.
 :
 : @author Michelle Rodzis
 : @version 0.1
 : @since TODO
 :)

module namespace tidySimple ="http://fontane-nb.dariah.eu/tidysimple";

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declare namespace tei="http://www.tei-c.org/ns/1.0";
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declare namespace test="http://exist-db.org/xquery/xqsuite";
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import module namespace config="http://textgrid.de/ns/SADE/config" at "../../config/config.xqm";
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import module namespace console="http://exist-db.org/xquery/console";
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import module namespace functx="http://www.functx.com";
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import module namespace simpleHelpers="http://fontane-nb.dariah.eu/teisimplehelpers" at "teisimplehelpers.xqm";

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declare variable $tidySimple:valid-hands :=
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    for $res in collection("/db/sade-projects/textgrid/data/xml/data")
(:    for $res in collection("/db/apps/SADE/resources/xml"):)
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    return
        $res//tei:handNote[@script = "contemporary"]/@xml:id/string();


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declare function tidySimple:main($tei as node()*) {
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  let $doc :=
    try {
      (doc($config:app-root || "/resources/xml/tei-simple-pre.xml"))
    } catch * {
      (console:log("It was not possible to open the requested file tei-simple-pre.xml."))
    }
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    let $text := $tei//tei:text
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    let $clear-invalid-hands := tidySimple:sort-out-invalid-hands($text)
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    let $clear-surplus-hands := tidySimple:sort-out-surplus-elements($clear-invalid-hands)
(:    let $text-with-sections := tidySimple:make-structure($clear-surplus-hands):)
(:    let $store := xmldb:store("/db/apps/SADE/resources/xml/", "tei-simple-tmp.xml", <div>{$text-with-sections}</div>):)
    let $store := xmldb:store("/db/apps/SADE/resources/xml/", "tei-simple-tmp.xml", <div>{$clear-surplus-hands}</div>)
    return "done"
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(:    let $doc := doc($config:app-root || "/resources/xml/tei-simple-tmp.xml"):)
(:    let $tidied-text := tidySimple:tidy($doc//tei:text):)
(:    let $final-tei:=:)
(:        <TEI xmlns="http://www.tei-c.org/ns/1.0">:)
(:            {$tei//tei:teiHeader}:)
(:            {$tidied-text}:)
(:        </TEI>:)
(::)
(:    return xmldb:store("/db/apps/SADE/resources/xml/", "tei-simple.xml", $final-tei):)
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};

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declare function tidySimple:sort-out-invalid-hands($nodes as node()*) 
as node()* {
    for $node in $nodes return
        typeswitch ($node)
        case text() return
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            if($node/preceding::tei:milestone[@unit = "handshift"][1] 
            and not(simpleHelpers:is-hand-valid($tidySimple:valid-hands, $node/preceding::tei:milestone[@unit = "handshift"][1]))) then
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                ()
            else
                $node
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        (: all lines have to be preserved because of the editorial commentary
        which references the lines in the notebooks. if we omitted @unit = "line"
        referencing wouldn't work any longer :)        
        case element(tei:milestone) return
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            let $prev-handshift := $node/preceding::tei:milestone[@unit = "handshift"][1]
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                return
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                if($node/@unit = "handshift" and
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                    simpleHelpers:is-hand-valid($tidySimple:valid-hands, $node)) then
                    tidySimple:clear-handshift($node)  
                    
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                else if($node/@unit = "handshift") then
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                    ()
                    
                else if($prev-handshift
                and $node/@unit = "line" 
                and not(simpleHelpers:is-hand-valid($tidySimple:valid-hands, $prev-handshift))) then
                    tidySimple:copy-element($node, "post")
                
                else if($prev-handshift
                and not(simpleHelpers:is-hand-valid($tidySimple:valid-hands, $prev-handshift))) then
                    ()
                
                else
                    tidySimple:copy-element($node, "post")
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        default return
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            let $prev-handshift := $node/preceding::tei:milestone[@unit = "handshift"][1]
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            return
                if($prev-handshift
                and not(simpleHelpers:is-hand-valid($tidySimple:valid-hands, $prev-handshift))) then
                    ()
                else
                    tidySimple:copy-element($node, "post")
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};


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declare function tidySimple:sort-out-surplus-elements($nodes as node()*) 
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as node()* {
    for $node in $nodes return
        typeswitch ($node)
        case text() return
            $node
        
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        case element(tei:milestone) return
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            if($node/@unit = "handshift") then
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                if(simpleHelpers:is-prev-hand-same($node)
                or not(tidySimple:has-hand-text($node))) then
                    ()
                else
                    tidySimple:clear-handshift($node)
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            else if($node/@unit = "line") then
                let $next-pb := $node/following::tei:pb[1]
                let $nodes-on-page := $node/preceding::tei:pb[1]/following::node()[. << $next-pb][functx:node-kind(.) = "text"]
                let $contains-text :=
                    for $node-pb in $nodes-on-page return
                        if(normalize-space($node-pb) != "") then
                            true()
                        else 
                            false()
                return
                    if(functx:is-value-in-sequence(true(), $contains-text)) then
                        element {QName("http://www.tei-c.org/ns/1.0", $node/name())} {
                            $node/@*,
                            tidySimple:sort-out-surplus-elements($node/node())
                        }
                    else
                        ()
                
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            else
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                element {QName("http://www.tei-c.org/ns/1.0", $node/name())} {
                    $node/@*,
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                    tidySimple:sort-out-surplus-elements($node/node())
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                }                
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        default return
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            element {QName("http://www.tei-c.org/ns/1.0", $node/name())} {
                $node/@*,
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                tidySimple:sort-out-surplus-elements($node/node())
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            }
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};

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declare function tidySimple:has-hand-text($node as element(tei:milestone))
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as xs:boolean {
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    let $next-handshift := $node/following::tei:milestone[@unit = "handshift"][1]
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    let $nodes-between := $node/following::node()[. << $next-handshift]
    let $is-text-node :=
        for $node-between in $nodes-between
        return 
            if ($node-between[self::text()]
            and not(normalize-space($node-between) = "")) then
                true()
            else
                false()
    return 
        if($next-handshift 
        and functx:is-value-in-sequence(true(), $is-text-node)) then
            true()
        else if(not($next-handshift)) then
            true()
        else
            false()
};

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declare function tidySimple:copy-element($node as node(), $flag as xs:string)
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 {
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    element {QName("http://www.tei-c.org/ns/1.0", $node/name())}{
        $node/@*,
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        if($flag = "structure") then
            tidySimple:make-structure($node/node())
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        else if($flag = "post") then
            tidySimple:sort-out-invalid-hands($node/node())        
        else if($flag = "surplus") then
            tidySimple:sort-out-invalid-hands($node/node())
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        else
            tidySimple:tidy($node/node())
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    }
};

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(:~
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 : Purges surplus attributes from tei:milestone[@unit = "handshift"].
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 : 
 : @author Michelle Rodzis
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 : @param $node the current tei:milestone[@unit = "handshift"]
 : @return the purged tei:milestone[@unit = "handshift"]
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 :  :)
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declare function tidySimple:clear-handshift($node as element(tei:milestone))
as element(tei:milestone) {
    element tei:milestone {
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        attribute unit {"handshift"},
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        if($node/@subtype = "") then
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            ()
        else
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            $node/@subtype,
        if($node/@rend = "") then
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            ()
        else
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            $node/@rend
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    }
};
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(:~ 
 : 
 :  :)
declare function tidySimple:make-structure($nodes as node()*) as node()* {
    for $node in $nodes return
        typeswitch ($node)
        case text() return
            if(tidySimple:is-in-section($node)) then
                ()
            else
                $node
                
        case element(tei:milestone) return 
            if($node/@unit = "section") then
                tidySimple:make-section($node)
                
            else if($node/@unit = "paragraph") then
                tidySimple:copy-element($node, "structure")
            
            (: lines in sections have to be ignored since they are copied into 
            the section with get-section-chunk :)    
            else if($node/@unit = "line"
            and tidySimple:is-in-section($node)) then
                ()
            else
                tidySimple:copy-element($node, "structure")
                
        case element(tei:anchor) return
            if (matches($node/preceding::tei:milestone/@spanTo, $node/@xml:id)) then
                ()
            else
                tidySimple:copy-element($node, "structure")
                
        default return 
            if(tidySimple:is-in-section($node)) then
                ()
            else
                tidySimple:copy-element($node, "structure")
};
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(:~
 : Checks if a given node is between a tei:milestone[@unit = "section"] and its
 : corresponing tei:anchor.
 : 
 : @author Michelle Rodzis
 : @param the current node
 : @return xs:boolean
 :  :)
declare function tidySimple:is-in-section($node as node()) as xs:boolean {
    let $prev-section-marker := $node/preceding::tei:milestone[1][@spanTo]
    let $target-id := replace($prev-section-marker, "#", "")
    let $next-anchor := $node/following::tei:anchor[matches(@xml:id, $target-id)]
    return
        if($prev-section-marker 
        and $next-anchor) then
            true()
        else
            false()
};


(:~
 : Creates a tei:div from a given tei:milestone[@unit = "section"] that contains 
 : all elements from a given tei:milestone to its corresponding tei:anchor.
 : 
 : Since the nodes between the current and the target one may also contain 
 : structural information (e.g. tei:milestone[@unit = "paragraph"]), these nodes
 : cannot simply be copied but have to be transformed as well.
 : 
 : @author Michelle Rodzis
 : @param $node the current tei:milestone[@unit = "section"]
 : @return element(tei:div)
 :  :)
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declare function tidySimple:make-section($node as element(tei:milestone)) 
as element(tei:div) {
    element tei:div {
        attribute type {"section"},
        tidySimple:get-section-chunk($node)
    }
};


(:~
 : Returns all nodes between a tei:milestone[@unit = "section"] and its 
 : corresponding tei:anchor.
 :
 : @author Michelle Rodzis
 : @param the current tei:milestone element
 : @return all nodes between the current element and the respective tei:anchor
 :)
declare function tidySimple:get-section-chunk($node as element(tei:milestone)) 
as node()* {
    let $target-id := substring-after($node/@spanTo, "#")
    let $target := $node/following::tei:anchor[matches(@xml:id, $target-id)]
    return
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        $node/following-sibling::node()[. << $target]
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};


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declare function tidySimple:tidy($nodes as node()*) as node()* {
    ()
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};