Added epub export function

1 files changed, 201 insertions, 0 deletions

diff --git a/inc/3rdparty/libraries/PHPePub/EPubChapterSplitter.php b/inc/3rdparty/libraries/PHPePub/EPubChapterSplitter.php
new file mode 100644
index 00000000..1d44f238
--- /dev/null
+++ b/inc/3rdparty/libraries/PHPePub/EPubChapterSplitter.php
@@ -0,0 +1,201 @@
+<?php
+/**
+ * Split an HTML file into smaller html files, retaining the formatting and structure for the individual parts.
+ * What this splitter does is using DOM to try and retain any formatting in the file, including rebuilding the DOM tree for subsequent parts.
+ * Split size is considered max target size. The actual size is the result of an even split across the resulting files.
+ *
+ * @author A. Grandt <php@grandt.com>
+ * @copyright 2009-2014 A. Grandt
+ * @license GNU LGPL 2.1
+ * @link http://www.phpclasses.org/package/6115
+ * @link https://github.com/Grandt/PHPePub
+ * @version 3.20
+ */
+class EPubChapterSplitter {
+    const VERSION = 3.20;
+
+    private $splitDefaultSize = 250000;
+    private $bookVersion = EPub::BOOK_VERSION_EPUB2;
+
+    /**
+     *
+     * Enter description here ...
+     *
+     * @param unknown_type $ident
+     */
+    function setVersion($bookVersion) {
+        $this->bookVersion = is_string($bookVersion) ? trim($bookVersion) : EPub::BOOK_VERSION_EPUB2;
+    }
+
+        /**
+     * Set default chapter target size.
+     * Default is 250000 bytes, and minimum is 10240 bytes.
+     *
+     * @param $size segment size in bytes
+     * @return void
+     */
+    function setSplitSize($size) {
+        $this->splitDefaultSize = (int)$size;
+        if ($size < 10240) {
+            $this->splitDefaultSize = 10240; // Making the file smaller than 10k is not a good idea.
+        }
+    }
+
+    /**
+     * Get the chapter target size.
+     *
+     * @return $size
+     */
+    function getSplitSize() {
+        return $this->splitDefaultSize;
+    }
+
+    /**
+     * Split $chapter into multiple parts.
+     *
+     * The search string can either be a regular string or a PHP PECL Regular Expression pattern as defined here: http://www.php.net/manual/en/pcre.pattern.php
+     * If the search string is a regular string, the matching will be for lines in the HTML starting with the string given
+     *
+     * @param String $chapter XHTML file
+     * @param Bool   $splitOnSearchString Split on chapter boundaries, Splitting on search strings disables the split size check.
+     * @param String $searchString Chapter string to search for can be fixed text, or a regular expression pattern.
+     *
+     * @return array with 1 or more parts
+     */
+    function splitChapter($chapter, $splitOnSearchString = false, $searchString = '/^Chapter\\ /i') {
+        $chapterData = array();
+        $isSearchRegexp = $splitOnSearchString && (preg_match('#^(\D|\S|\W).+\1[imsxeADSUXJu]*$#m', $searchString) == 1);
+        if ($splitOnSearchString && !$isSearchRegexp) {
+            $searchString = '#^<.+?>' . preg_quote($searchString, '#') . "#";
+        }
+
+        if (!$splitOnSearchString && strlen($chapter) <= $this->splitDefaultSize) {
+            return array($chapter);
+        }
+
+        $xmlDoc = new DOMDocument();
+        @$xmlDoc->loadHTML($chapter);
+
+        $head = $xmlDoc->getElementsByTagName("head");
+        $body = $xmlDoc->getElementsByTagName("body");
+
+        $htmlPos = stripos($chapter, "<html");
+        $htmlEndPos = stripos($chapter, ">", $htmlPos);
+        $newXML = substr($chapter, 0, $htmlEndPos+1) . "\n</html>";
+        if (strpos(trim($newXML), "<?xml ") === FALSE) {
+            $newXML = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" . $newXML;
+        }
+        $headerLength = strlen($newXML);
+
+        $files = array();
+        $chapterNames = array();
+        $domDepth = 0;
+        $domPath = array();
+        $domClonedPath = array();
+
+        $curFile = $xmlDoc->createDocumentFragment();
+        $files[] = $curFile;
+        $curParent = $curFile;
+        $curSize = 0;
+
+        $bodyLen = strlen($xmlDoc->saveXML($body->item(0)));
+        $headLen = strlen($xmlDoc->saveXML($head->item(0))) + $headerLength;
+
+        $partSize = $this->splitDefaultSize - $headLen;
+
+        if ($bodyLen > $partSize) {
+            $parts = ceil($bodyLen / $partSize);
+            $partSize = ($bodyLen / $parts)  - $headLen;
+        }
+
+        $node = $body->item(0)->firstChild;
+
+        do {
+            $nodeData = $xmlDoc->saveXML($node);
+            $nodeLen = strlen($nodeData);
+
+            if ($nodeLen > $partSize && $node->hasChildNodes()) {
+                $domPath[] = $node;
+                $domClonedPath[] = $node->cloneNode(false);
+                $domDepth++;
+
+                $node = $node->firstChild;
+            }
+
+            $node2 = $node->nextSibling;
+
+            if ($node != null && $node->nodeName != "#text") {
+                $doSplit = false;
+                if ($splitOnSearchString) {
+                    $doSplit = preg_match($searchString, $nodeData) == 1;
+                    if ($doSplit) {
+                        $chapterNames[] = trim($nodeData);
+                    }
+                }
+
+                if ($curSize > 0 && ($doSplit || (!$splitOnSearchString && $curSize + $nodeLen > $partSize))) {
+                    $curFile = $xmlDoc->createDocumentFragment();
+                    $files[] = $curFile;
+                    $curParent = $curFile;
+                    if ($domDepth > 0) {
+                        reset($domPath);
+                        reset($domClonedPath);
+                        $oneDomClonedPath = each($domClonedPath);
+                        while ($oneDomClonedPath) {
+                            list($k, $v) = $oneDomClonedPath;
+                            $newParent = $v->cloneNode(false);
+                            $curParent->appendChild($newParent);
+                            $curParent = $newParent;
+                            $oneDomClonedPath = each($domClonedPath);
+                        }
+                    }
+                    $curSize = strlen($xmlDoc->saveXML($curFile));
+                }
+                $curParent->appendChild($node->cloneNode(true));
+                $curSize += $nodeLen;
+            }
+
+            $node = $node2;
+            while ($node == null && $domDepth > 0) {
+                $domDepth--;
+                $node = end($domPath)->nextSibling;
+                array_pop($domPath);
+                array_pop($domClonedPath);
+                $curParent = $curParent->parentNode;
+            }
+        } while ($node != null);
+
+        $curFile = null;
+        $curSize = 0;
+
+        $xml = new DOMDocument('1.0', $xmlDoc->xmlEncoding);
+        $xml->lookupPrefix("http://www.w3.org/1999/xhtml");
+        $xml->preserveWhiteSpace = false;
+        $xml->formatOutput = true;
+
+        for ($idx = 0; $idx < count($files); $idx++) {
+            $xml2Doc = new DOMDocument('1.0', $xmlDoc->xmlEncoding);
+            $xml2Doc->lookupPrefix("http://www.w3.org/1999/xhtml");
+            $xml2Doc->loadXML($newXML);
+            $html = $xml2Doc->getElementsByTagName("html")->item(0);
+            $html->appendChild($xml2Doc->importNode($head->item(0), true));
+            $body = $xml2Doc->createElement("body");
+            $html->appendChild($body);
+            $body->appendChild($xml2Doc->importNode($files[$idx], true));
+
+            // force pretty printing and correct formatting, should not be needed, but it is.
+            $xml->loadXML($xml2Doc->saveXML());
+
+                        $doc = $xml->saveXML();
+
+                        if ($this->bookVersion === EPub::BOOK_VERSION_EPUB3) {
+                                $doc = preg_replace('#^\s*<!DOCTYPE\ .+?>\s*#im', '', $doc);
+                        }
+
+            $chapterData[$splitOnSearchString ? $chapterNames[$idx] : $idx] = $doc;
+        }
+
+        return $chapterData;
+    }
+}
+?>