Added epub export function

1 files changed, 782 insertions, 0 deletions

diff --git a/inc/3rdparty/libraries/PHPePub/EPub.NCX.php b/inc/3rdparty/libraries/PHPePub/EPub.NCX.php
new file mode 100644
index 00000000..e5da05cd
--- /dev/null
+++ b/inc/3rdparty/libraries/PHPePub/EPub.NCX.php
@@ -0,0 +1,782 @@
+<?php
+/**
+ * ePub NCX file structure
+ *
+ * @author A. Grandt <php@grandt.com>
+ * @copyright 2009-2014 A. Grandt
+ * @license GNU LGPL, Attribution required for commercial implementations, requested for everything else.
+ * @version 3.20
+ */
+class Ncx {
+    const _VERSION = 3.20;
+
+    const MIMETYPE = "application/x-dtbncx+xml";
+
+    private $bookVersion = EPub::BOOK_VERSION_EPUB2;
+
+    private $navMap = NULL;
+    private $uid = NULL;
+    private $meta = array();
+    private $docTitle = NULL;
+    private $docAuthor = NULL;
+
+    private $currentLevel = NULL;
+    private $lastLevel = NULL;
+
+    private $languageCode = "en";
+    private $writingDirection = EPub::DIRECTION_LEFT_TO_RIGHT;
+
+    public $chapterList = array();
+    public $referencesTitle = "Guide";
+    public $referencesClass = "references";
+        public $referencesId = "references";
+        public $referencesList = array();
+    public $referencesName = array();
+    public $referencesOrder = NULL;
+
+    /**
+     * Class constructor.
+         *
+         * @param string $uid
+         * @param string $docTitle
+         * @param string $docAuthor
+         * @param string $languageCode
+         * @param string $writingDirection
+         */
+    function __construct($uid = NULL, $docTitle = NULL, $docAuthor = NULL, $languageCode = "en", $writingDirection = EPub::DIRECTION_LEFT_TO_RIGHT) {
+        $this->navMap = new NavMap($writingDirection);
+        $this->currentLevel = $this->navMap;
+        $this->setUid($uid);
+        $this->setDocTitle($docTitle);
+        $this->setDocAuthor($docAuthor);
+                $this->setLanguageCode($languageCode);
+                $this->setWritingDirection($writingDirection);
+    }
+
+    /**
+     * Class destructor
+     *
+     * @return void
+     */
+    function __destruct() {
+        unset($this->bookVersion, $this->navMap, $this->uid, $this->meta);
+        unset($this->docTitle, $this->docAuthor, $this->currentLevel, $this->lastLevel);
+                unset($this->languageCode, $this->writingDirection, $this->chapterList, $this->referencesTitle);
+                unset($this->referencesClass, $this->referencesId, $this->referencesList, $this->referencesName);
+                unset($this->referencesOrder);
+        }
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @param string $bookVersion
+     */
+    function setVersion($bookVersion) {
+        $this->bookVersion = is_string($bookVersion) ? trim($bookVersion) : EPub::BOOK_VERSION_EPUB2;
+    }
+
+        /**
+         *
+         * @return bool TRUE if the book is set to type ePub 2
+         */
+    function isEPubVersion2() {
+        return $this->bookVersion === EPub::BOOK_VERSION_EPUB2;
+   }
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @param string $uid
+     */
+    function setUid($uid) {
+        $this->uid = is_string($uid) ? trim($uid) : NULL;
+    }
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @param string $docTitle
+     */
+    function setDocTitle($docTitle) {
+        $this->docTitle = is_string($docTitle) ? trim($docTitle) : NULL;
+    }
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @param string $docAuthor
+     */
+    function setDocAuthor($docAuthor) {
+        $this->docAuthor = is_string($docAuthor) ? trim($docAuthor) : NULL;
+    }
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @param string $languageCode
+     */
+    function setLanguageCode($languageCode) {
+        $this->languageCode = is_string($languageCode) ? trim($languageCode) : "en";
+    }
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @param string $writingDirection
+     */
+    function setWritingDirection($writingDirection) {
+        $this->writingDirection = is_string($writingDirection) ? trim($writingDirection) : EPub::DIRECTION_LEFT_TO_RIGHT;
+    }
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @param NavMap $navMap
+     */
+    function setNavMap($navMap) {
+        if ($navMap != NULL && is_object($navMap) && get_class($navMap) === "NavMap") {
+            $this->navMap = $navMap;
+        }
+    }
+
+    /**
+     * Add one chapter level.
+     *
+     * Subsequent chapters will be added to this level.
+         *
+         * @param string $navTitle
+         * @param string $navId
+         * @param string $navClass
+         * @param string $isNavHidden
+         * @param string $writingDirection
+         * @return NavPoint
+         */
+    function subLevel($navTitle = NULL, $navId = NULL, $navClass = NULL, $isNavHidden = FALSE, $writingDirection = NULL) {
+                $navPoint = FALSE;
+                if (isset($navTitle) && isset($navClass)) {
+                        $navPoint = new NavPoint($navTitle, NULL, $navId, $navClass, $isNavHidden, $writingDirection);
+                        $this->addNavPoint($navPoint);
+                }
+        if ($this->lastLevel !== NULL) {
+            $this->currentLevel = $this->lastLevel;
+        }
+                return $navPoint;
+    }
+
+    /**
+     * Step back one chapter level.
+     *
+     * Subsequent chapters will be added to this chapters parent level.
+     */
+    function backLevel() {
+        $this->lastLevel = $this->currentLevel;
+        $this->currentLevel = $this->currentLevel->getParent();
+    }
+
+    /**
+     * Step back to the root level.
+     *
+     * Subsequent chapters will be added to the rooot NavMap.
+     */
+    function rootLevel() {
+        $this->lastLevel = $this->currentLevel;
+        $this->currentLevel = $this->navMap;
+    }
+
+    /**
+     * Step back to the given level.
+     * Useful for returning to a previous level from deep within the structure.
+     * Values below 2 will have the same effect as rootLevel()
+     *
+     * @param int $newLevel
+     */
+    function setCurrentLevel($newLevel) {
+        if ($newLevel <= 1) {
+            $this->rootLevel();
+        } else {
+            while ($this->currentLevel->getLevel() > $newLevel) {
+                $this->backLevel();
+            }
+        }
+    }
+
+    /**
+     * Get current level count.
+     * The indentation of the current structure point.
+     *
+     * @return current level count;
+     */
+    function getCurrentLevel() {
+        return $this->currentLevel->getLevel();
+    }
+
+    /**
+     * Add child NavPoints to current level.
+     *
+     * @param NavPoint $navPoint
+     */
+    function addNavPoint($navPoint) {
+        $this->lastLevel = $this->currentLevel->addNavPoint($navPoint);
+    }
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @return NavMap
+     */
+    function getNavMap() {
+        return $this->navMap;
+    }
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @param string $name
+     * @param string $content
+     */
+    function addMetaEntry($name, $content) {
+        $name = is_string($name) ? trim($name) : NULL;
+        $content = is_string($content) ? trim($content) : NULL;
+
+        if ($name != NULL && $content != NULL) {
+            $this->meta[] = array($name => $content);
+        }
+    }
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @return string
+     */
+    function finalize() {
+        $nav = $this->navMap->finalize();
+
+        $ncx = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
+        if ($this->isEPubVersion2()) {
+            $ncx .= "<!DOCTYPE ncx PUBLIC \"-//NISO//DTD ncx 2005-1//EN\"\n"
+            . "  \"http://www.daisy.org/z3986/2005/ncx-2005-1.dtd\">\n";
+        }
+        $ncx .= "<ncx xmlns=\"http://www.daisy.org/z3986/2005/ncx/\" version=\"2005-1\" xml:lang=\"" . $this->languageCode . "\" dir=\"" . $this->writingDirection . "\">\n"
+        . "\t<head>\n"
+        . "\t\t<meta name=\"dtb:uid\" content=\"" . $this->uid . "\" />\n"
+        . "\t\t<meta name=\"dtb:depth\" content=\"" . $this->navMap->getNavLevels() . "\" />\n"
+        . "\t\t<meta name=\"dtb:totalPageCount\" content=\"0\" />\n"
+        . "\t\t<meta name=\"dtb:maxPageNumber\" content=\"0\" />\n";
+
+        if (sizeof($this->meta)) {
+            foreach ($this->meta as $metaEntry) {
+                list($name, $content) = each($metaEntry);
+                $ncx .= "\t\t<meta name=\"" . $name . "\" content=\"" . $content . "\" />\n";
+            }
+        }
+
+        $ncx .= "\t</head>\n\n\t<docTitle>\n\t\t<text>"
+        . $this->docTitle
+        . "</text>\n\t</docTitle>\n\n\t<docAuthor>\n\t\t<text>"
+        . $this->docAuthor
+        . "</text>\n\t</docAuthor>\n\n"
+        . $nav;
+
+        return $ncx . "</ncx>\n";
+    }
+
+        /**
+         *
+         * @param string $title
+         * @param string $cssFileName
+         * @return string
+         */
+    function finalizeEPub3($title = "Table of Contents", $cssFileName = NULL) {
+                $end = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
+            . "<html xmlns=\"http://www.w3.org/1999/xhtml\"\n"
+            . "      xmlns:epub=\"http://www.idpf.org/2007/ops\"\n"
+            . "      xml:lang=\"" . $this->languageCode . "\" lang=\"" . $this->languageCode . "\" dir=\"" . $this->writingDirection . "\">\n"
+            . "\t<head>\n"
+            . "\t\t<title>" . $this->docTitle . "</title>\n"
+            . "\t\t<meta http-equiv=\"default-style\" content=\"text/html; charset=utf-8\"/>\n";
+        if ($cssFileName !== NULL) {
+            $end .= "\t\t<link rel=\"stylesheet\" href=\"" . $cssFileName . "\" type=\"text/css\"/>\n";
+        }
+        $end .= "\t</head>\n"
+            . "\t<body epub:type=\"frontmatter toc\">\n"
+            . "\t\t<header>\n"
+            . "\t\t\t<h1>" . $title . "</h1>\n"
+            . "\t\t</header>\n"
+            . $this->navMap->finalizeEPub3()
+            . $this->finalizeEPub3Landmarks()
+            . "\t</body>\n"
+            . "</html>\n";
+
+        return $end;
+    }
+
+        /**
+         * Build the references for the ePub 2 toc.
+         * These are merely reference pages added to the end of the navMap though.
+         *
+         * @return string
+         */
+        function finalizeReferences() {
+                if (isset($this->referencesList) && sizeof($this->referencesList) > 0) {
+                        $this->rootLevel();
+                        $this->subLevel($this->referencesTitle, $this->referencesId, $this->referencesClass);
+                        $refId = 1;
+                        while (list($item, $descriptive) = each($this->referencesOrder)) {
+                                if (array_key_exists($item, $this->referencesList)) {
+                                        $name = (empty($this->referencesName[$item]) ? $descriptive : $this->referencesName[$item]);
+                                        $navPoint = new NavPoint($name, $this->referencesList[$item], "ref-" . $refId++);
+                                        $this->addNavPoint($navPoint);
+                                }
+                        }
+                }
+        }
+
+        /**
+         * Build the landmarks for the ePub 3 toc.
+         * @return string
+         */
+        function finalizeEPub3Landmarks() {
+                $lm = "";
+                if (isset($this->referencesList) && sizeof($this->referencesList) > 0) {
+                        $lm = "\t\t\t<nav epub:type=\"landmarks\">\n"
+                                        . "\t\t\t\t<h2"
+                                        . ($this->writingDirection === EPub::DIRECTION_RIGHT_TO_LEFT ? " dir=\"rtl\"" : "")
+                                        . ">" . $this->referencesTitle . "</h2>\n"
+                                        . "\t\t\t\t<ol>\n";
+
+                        $li = "";
+                        while (list($item, $descriptive) = each($this->referencesOrder)) {
+                                if (array_key_exists($item, $this->referencesList)) {
+                                        $li .= "\t\t\t\t\t<li><a epub:type=\""
+                                                        . $item
+                                                        . "\" href=\"" . $this->referencesList[$item] . "\">"
+                                                        . (empty($this->referencesName[$item]) ? $descriptive : $this->referencesName[$item])
+                                                        . "</a></li>\n";
+                                }
+                        }
+                        if (empty($li)) {
+                                return "";
+                        }
+
+                        $lm .= $li
+                                        . "\t\t\t\t</ol>\n"
+                                        . "\t\t\t</nav>\n";
+                }
+                return $lm;
+        }
+}
+
+/**
+ * ePub NavMap class
+ */
+class NavMap {
+    const _VERSION = 3.00;
+
+    private $navPoints = array();
+    private $navLevels = 0;
+        private $writingDirection = NULL;
+
+    /**
+     * Class constructor.
+     *
+     * @return void
+     */
+    function __construct($writingDirection = NULL) {
+                $this->setWritingDirection($writingDirection);
+    }
+
+    /**
+     * Class destructor
+     *
+     * @return void
+     */
+    function __destruct() {
+        unset($this->navPoints, $this->navLevels, $this->writingDirection);
+    }
+
+    /**
+     * Set the writing direction to be used for this NavPoint.
+     *
+     * @param string $writingDirection
+     */
+    function setWritingDirection($writingDirection) {
+        $this->writingDirection = isset($writingDirection) && is_string($writingDirection) ? trim($writingDirection) : NULL;
+    }
+
+    function getWritingDirection() {
+        return $this->writingDirection;
+    }
+
+    /**
+     * Add a navPoint to the root of the NavMap.
+     *
+     * @param NavPoint $navPoint
+     * @return NavMap
+     */
+    function addNavPoint($navPoint) {
+        if ($navPoint != NULL && is_object($navPoint) && get_class($navPoint) === "NavPoint") {
+            $navPoint->setParent($this);
+                        if ($navPoint->getWritingDirection() == NULL) {
+                                $navPoint->setWritingDirection($this->writingDirection);
+                        }
+            $this->navPoints[] = $navPoint;
+            return $navPoint;
+        }
+        return $this;
+    }
+
+    /**
+     * The final max depth for the "dtb:depth" meta attribute
+     * Only available after finalize have been called.
+     *
+     * @return number
+     */
+    function getNavLevels() {
+        return $this->navLevels+1;
+    }
+
+    function getLevel() {
+        return 1;
+    }
+
+    function getParent() {
+        return $this;
+    }
+
+    /**
+     * Finalize the navMap, the final max depth for the "dtb:depth" meta attribute can be retrieved with getNavLevels after finalization
+     *
+     */
+    function finalize() {
+        $playOrder = 0;
+        $this->navLevels = 0;
+
+        $nav = "\t<navMap>\n";
+        if (sizeof($this->navPoints) > 0) {
+            $this->navLevels++;
+            foreach ($this->navPoints as $navPoint) {
+                $retLevel = $navPoint->finalize($nav, $playOrder, 0);
+                if ($retLevel > $this->navLevels) {
+                    $this->navLevels = $retLevel;
+                }
+            }
+        }
+        return $nav . "\t</navMap>\n";
+    }
+
+    /**
+     * Finalize the navMap, the final max depth for the "dtb:depth" meta attribute can be retrieved with getNavLevels after finalization
+     *
+     */
+    function finalizeEPub3() {
+        $playOrder = 0;
+        $level = 0;
+        $this->navLevels = 0;
+
+        $nav = "\t\t<nav epub:type=\"toc\" id=\"toc\">\n";
+
+        if (sizeof($this->navPoints) > 0) {
+            $this->navLevels++;
+
+            $nav .= str_repeat("\t", $level) . "\t\t\t<ol epub:type=\"list\">\n";
+            foreach ($this->navPoints as $navPoint) {
+                $retLevel = $navPoint->finalizeEPub3($nav, $playOrder, 0);
+                if ($retLevel > $this->navLevels) {
+                    $this->navLevels = $retLevel;
+                }
+            }
+            $nav .= str_repeat("\t", $level) . "\t\t\t</ol>\n";
+        }
+
+        return $nav . "\t\t</nav>\n";
+    }
+}
+
+/**
+ * ePub NavPoint class
+ */
+class NavPoint {
+    const _VERSION = 3.00;
+
+    private $label = NULL;
+    private $contentSrc = NULL;
+    private $id = NULL;
+    private $navClass = NULL;
+    private $isNavHidden = FALSE;
+        private $navPoints = array();
+        private $parent = NULL;
+
+    /**
+     * Class constructor.
+     *
+     * All three attributes are mandatory, though if ID is set to null (default) the value will be generated.
+     *
+     * @param string $label
+     * @param string $contentSrc
+     * @param string $id
+         * @param string $navClass
+         * @param bool   $isNavHidden
+         * @param string $writingDirection
+         */
+    function __construct($label, $contentSrc = NULL, $id = NULL, $navClass = NULL, $isNavHidden = FALSE, $writingDirection = NULL) {
+        $this->setLabel($label);
+        $this->setContentSrc($contentSrc);
+        $this->setId($id);
+        $this->setNavClass($navClass);
+        $this->setNavHidden($isNavHidden);
+                $this->setWritingDirection($writingDirection);
+    }
+
+    /**
+     * Class destructor
+     *
+     * @return void
+     */
+    function __destruct() {
+        unset($this->label, $this->contentSrc, $this->id, $this->navClass);
+        unset($this->isNavHidden, $this->navPoints, $this->parent);
+    }
+
+    /**
+     * Set the Text label for the NavPoint.
+     *
+     * The label is mandatory.
+     *
+     * @param string $label
+     */
+    function setLabel($label) {
+        $this->label = is_string($label) ? trim($label) : NULL;
+    }
+
+    /**
+     * Get the Text label for the NavPoint.
+     *
+     * @return string Label
+     */
+    function getLabel() {
+        return $this->label;
+    }
+
+    /**
+     * Set the src reference for the NavPoint.
+     *
+     * The src is mandatory for ePub 2.
+     *
+     * @param string $contentSrc
+     */
+    function setContentSrc($contentSrc) {
+        $this->contentSrc =  isset($contentSrc) && is_string($contentSrc) ? trim($contentSrc) : NULL;
+    }
+
+    /**
+     * Get the src reference for the NavPoint.
+     *
+     * @return string content src url.
+     */
+    function getContentSrc() {
+        return $this->contentSrc;
+    }
+    /**
+     * Set the parent for this NavPoint.
+     *
+     * @param NavPoint or NavMap $parent
+     */
+    function setParent($parent) {
+        if ($parent != NULL && is_object($parent) &&
+                (get_class($parent) === "NavPoint" || get_class($parent) === "NavMap") ) {
+            $this->parent = $parent;
+        }
+    }
+
+    /**
+     * Get the parent to this NavPoint.
+     *
+     * @return NavPoint, or NavMap if the parent is the root.
+     */
+    function getParent() {
+        return $this->parent;
+    }
+
+    /**
+     * Get the current level. 1 = document root.
+     *
+     * @return int level
+     */
+    function getLevel() {
+        return $this->parent === NULL ? 1 : $this->parent->getLevel()+1;
+    }
+
+    /**
+     * Set the id for the NavPoint.
+     *
+     * The id must be unique, and is mandatory.
+     *
+     * @param string $id
+     */
+    function setId($id) {
+        $this->id = is_string($id) ? trim($id) : NULL;
+    }
+
+    /**
+     * Set the class to be used for this NavPoint.
+     *
+     * @param string $navClass
+     */
+    function setNavClass($navClass) {
+        $this->navClass = isset($navClass) && is_string($navClass) ? trim($navClass) : NULL;
+    }
+
+    /**
+     * Set the class to be used for this NavPoint.
+     *
+     * @param string $navClass
+     */
+    function setNavHidden($isNavHidden) {
+        $this->isNavHidden = $isNavHidden === TRUE;
+    }
+
+    /**
+     * Set the writing direction to be used for this NavPoint.
+     *
+     * @param string $writingDirection
+     */
+    function setWritingDirection($writingDirection) {
+        $this->writingDirection = isset($writingDirection) && is_string($writingDirection) ? trim($writingDirection) : NULL;
+    }
+
+    function getWritingDirection() {
+        return $this->writingDirection;
+    }
+
+        /**
+     * Add child NavPoints for multi level NavMaps.
+     *
+     * @param NavPoint $navPoint
+     */
+    function addNavPoint($navPoint) {
+        if ($navPoint != NULL && is_object($navPoint) && get_class($navPoint) === "NavPoint") {
+            $navPoint->setParent($this);
+                        if ($navPoint->getWritingDirection() == NULL) {
+                                $navPoint->setWritingDirection($this->writingDirection);
+                        }
+            $this->navPoints[] = $navPoint;
+            return $navPoint;
+        }
+        return $this;
+    }
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @param string $nav
+     * @param int    $playOrder
+     * @param int    $level
+     * @return int
+     */
+    function finalize(&$nav = "", &$playOrder = 0, $level = 0) {
+        $maxLevel = $level;
+        $levelAdjust = 0;
+
+                if ($this->isNavHidden) {
+                        return $maxLevel;
+                }
+
+                if (isset($this->contentSrc)) {
+                        $playOrder++;
+
+                        if ($this->id == NULL) {
+                                $this->id = "navpoint-" . $playOrder;
+                        }
+                        $nav .= str_repeat("\t", $level) . "\t\t<navPoint id=\"" . $this->id . "\" playOrder=\"" . $playOrder . "\">\n"
+                        . str_repeat("\t", $level) . "\t\t\t<navLabel>\n"
+                        . str_repeat("\t", $level) . "\t\t\t\t<text>" . $this->label . "</text>\n"
+                        . str_repeat("\t", $level) . "\t\t\t</navLabel>\n"
+                        . str_repeat("\t", $level) . "\t\t\t<content src=\"" . $this->contentSrc . "\" />\n";
+                } else {
+                        $levelAdjust++;
+                }
+
+        if (sizeof($this->navPoints) > 0) {
+            $maxLevel++;
+            foreach ($this->navPoints as $navPoint) {
+                $retLevel = $navPoint->finalize($nav, $playOrder, ($level+1+$levelAdjust));
+                if ($retLevel > $maxLevel) {
+                    $maxLevel = $retLevel;
+                }
+            }
+        }
+
+                if (isset($this->contentSrc)) {
+                $nav .= str_repeat("\t", $level) . "\t\t</navPoint>\n";
+                }
+
+        return $maxLevel;
+    }
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @param string $nav
+     * @param int    $playOrder
+     * @param int    $level
+     * @return int
+     */
+    function finalizeEPub3(&$nav = "", &$playOrder = 0, $level = 0, $subLevelClass = NULL, $subLevelHidden = FALSE) {
+        $maxLevel = $level;
+
+        if ($this->id == NULL) {
+            $this->id = "navpoint-" . $playOrder;
+        }
+                $indent = str_repeat("\t", $level) . "\t\t\t\t";
+
+        $nav .= $indent . "<li id=\"" . $this->id . "\"";
+                if (isset($this->writingDirection)) {
+                        $nav .= " dir=\"" . $this->writingDirection . "\"";
+                }
+                $nav .=  ">\n";
+
+                if (isset($this->contentSrc)) {
+                        $nav .= $indent . "\t<a href=\"" . $this->contentSrc . "\">" . $this->label . "</a>\n";
+                } else {
+                        $nav .= $indent . "\t<span>" . $this->label . "</span>\n";
+                }
+
+        if (sizeof($this->navPoints) > 0) {
+            $maxLevel++;
+
+                        $nav .= $indent . "\t<ol epub:type=\"list\"";
+            if (isset($subLevelClass)) {
+                                $nav .= " class=\"" . $subLevelClass . "\"";
+                        }
+            if ($subLevelHidden) {
+                                $nav .= " hidden=\"hidden\"";
+                        }
+            $nav .= ">\n";
+
+            foreach ($this->navPoints as $navPoint) {
+                $retLevel = $navPoint->finalizeEPub3($nav, $playOrder, ($level+2), $subLevelClass, $subLevelHidden);
+                if ($retLevel > $maxLevel) {
+                    $maxLevel = $retLevel;
+                }
+            }
+            $nav .= $indent . "\t</ol>\n";
+        }
+
+        $nav .= $indent . "</li>\n";
+
+        return $maxLevel;
+    }
+}
+?>
\ No newline at end of file