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<?php |
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/* |
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* This file is part of the trefoil application. |
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* |
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* (c) Miguel Angel Gabriel <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Trefoil\Publishers; |
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use mikehaertl\wkhtmlto\Pdf; |
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use Symfony\Component\Yaml\Yaml; |
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/** |
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* It publishes the book as a PDF file. All the internal links are transformed |
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* into clickable cross-section book links. These links even display automatically |
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* the page number where they point into, so no information is lost when printing |
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* the book. |
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*/ |
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class PdfWkhtmltopdfPublisher extends PdfPublisher |
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{ |
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public function checkIfThisPublisherIsSupported() |
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{ |
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if (null !== $this->app['wkhtmltopdf.path'] && file_exists($this->app['wkhtmltopdf.path'])) { |
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$wkhtmltopdfPath = $this->app['wkhtmltopdf.path']; |
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} else { |
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$wkhtmltopdfPath = $this->findWkhtmltopdfPath(); |
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} |
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$this->app['wkhtmltopdf.path'] = $wkhtmltopdfPath; |
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return null !== $wkhtmltopdfPath && file_exists($wkhtmltopdfPath); |
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} |
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/** |
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* Assemble the book using wkhtmltopdf. |
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* |
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* Some limitations/remarks: |
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* |
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* - Hyphenation is unsupported natively by wkhtmltopdf. |
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* Currently managed by an external Javascript library. |
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* |
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* - PDF cover is not supported. Only HTML cover is supported. |
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* |
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* - Facing odd/even pages are unsupported. |
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* |
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* - PDF outline cannot be filtered. It will always contain all |
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* document headings. |
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* |
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* - TOC filtering is (very) limited, performed via XSLT |
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* transformation. |
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* |
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*/ |
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public function assembleBook() |
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{ |
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// reuse output temp dir for easy debugging and to avoid polluting the cache dir |
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$tmpDir = $this->app['app.dir.cache'] . '/' . 'easybook_pdf'; |
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if (!$this->app['filesystem']->exists($tmpDir)) { |
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$this->app['filesystem']->mkdir($tmpDir); |
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} |
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/** @var Pdf $wkhtmltopdf */ |
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$wkhtmltopdf = $this->app['wkhtmltopdf']; |
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// consolidate book images to temp dir |
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$imagesDir = $tmpDir . '/images'; |
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if (!$this->app['filesystem']->exists($imagesDir)) { |
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$this->app['filesystem']->mkdir($imagesDir); |
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} |
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$this->prepareBookImages($imagesDir); |
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// filter out unusupported content items and extract certain values |
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$extractedValues = $this->prepareBookItems(); |
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// render components |
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$htmlBookFilePath = $this->renderBook($tmpDir); |
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$htmlCoverFilePath = $this->renderHtmlCover($tmpDir); |
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$tocFilePath = $this->renderToc($tmpDir, $extractedValues['toc-title']); |
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// prepare global options like paper size and margins |
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$globalOptions = $this->setGlobalOptions($tmpDir); |
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// add the stylesheet |
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$globalOptions = array_merge($globalOptions, $this->prepareStyleSheet($tmpDir)); |
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// prepare page options like headers and footers |
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$pageOptions = $this->prepareHeaderAndFooter($tmpDir); |
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// top and bottom margins need to be tweaked to make room for header/footer |
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$globalOptions['margin-top'] += $pageOptions['header-spacing']; |
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$globalOptions['margin-bottom'] += $pageOptions['footer-spacing']; |
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// set the options as global |
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$wkhtmltopdf->setOptions($globalOptions); |
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// add cover |
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$wkhtmltopdf->addPage($htmlCoverFilePath); |
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// TOC is always first after cover |
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$tocOptions = [ |
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'xsl-style-sheet' => $tocFilePath, |
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]; |
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$wkhtmltopdf->addToc($tocOptions); |
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// rest of the book |
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$wkhtmltopdf->addPage($htmlBookFilePath, $pageOptions); |
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// do the conversion |
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$pdfBookFilePath = $this->app['publishing.dir.output'] . '/book.pdf'; |
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if ($wkhtmltopdf->saveAs($pdfBookFilePath) === false) { |
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$this->displayPdfConversionErrors($wkhtmltopdf->getError()); |
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} |
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echo $wkhtmltopdf->getCommand()->getExecCommand(); |
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} |
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/** |
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* Looks for the executable of the wkhtmltopdf library. |
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* |
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* @return string The absolute path of the executable |
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* |
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* @throws \RuntimeException If the wkhtmltopdf executable is not found |
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*/ |
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View Code Duplication |
protected function findWkhtmltopdfPath() |
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{ |
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foreach ($this->app['wkhtmltopdf.default_paths'] as $path) { |
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if (file_exists($path)) { |
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return $path; |
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} |
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} |
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// the executable couldn't be found in the common |
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// installation directories. Ask the user for the path |
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$isInteractive = null !== $this->app['console.input'] && $this->app['console.input']->isInteractive(); |
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if ($isInteractive) { |
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return $this->askForWkhtmltopdfPath(); |
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} |
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throw new \RuntimeException( |
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sprintf( |
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"ERROR: The wkhtmltopdf library needed to generate PDF books cannot be found.\n" |
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. " Check that you have installed wkhtmltopdf in a common directory \n" |
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. " or set your custom wkhtmltopdf path in the book's config.yml file:\n\n" |
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. '%s', |
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$this->getSampleYamlConfiguration() |
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) |
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); |
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} |
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/** |
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* Ask the user for the executable location. |
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* |
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* @return string |
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*/ |
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View Code Duplication |
protected function askForWkhtmltopdfPath() |
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{ |
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$this->app['console.output']->write( |
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sprintf( |
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" In order to generate PDF files, PrinceXML library must be installed. \n\n" |
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. " We couldn't find PrinceXML executable in any of the following directories: \n" |
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. " -> %s \n\n" |
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. " If you haven't installed it yet, you can download a fully-functional demo at: \n" |
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. " %s \n\n" |
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. " If you have installed in a custom directory, please type its full absolute path:\n > ", |
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implode($this->app['prince.default_paths'], "\n -> "), |
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'http://wkhtmltopdf.org/downloads.html' |
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) |
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); |
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$userGivenPath = trim(fgets(STDIN)); |
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// output a newline for aesthetic reasons |
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$this->app['console.output']->write("\n"); |
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return $userGivenPath; |
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} |
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/** |
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* It displays the error messages generated by the PDF conversion |
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* process in a user-friendly way. |
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* |
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* @param array $errorMessages The array of messages generated by PrinceXML |
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*/ |
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protected function displayPdfConversionErrors($errorMessages) |
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{ |
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$this->app['console.output']->writeln("\n Wkhtmltopdf errors and warnings"); |
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$this->app['console.output']->writeln(" -------------------------------\n"); |
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$this->app['console.output']->writeln($errorMessages); |
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$this->app['console.output']->writeln("\n"); |
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} |
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/** |
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* It returns the needed configuration to set up the custom wkhtmltopdf path |
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* using YAML format. |
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* |
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* @return string The sample YAML configuration |
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*/ |
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private function getSampleYamlConfiguration() |
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{ |
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return <<<YAML |
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easybook: |
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parameters: |
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wkhtmltopdf.path: '/path/to/utils/wkhtmltopdf' |
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book: |
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title: ... |
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author: ... |
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# ... |
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YAML; |
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} |
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/** |
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* Set global wkhtmptopdf options. |
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* |
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* @param $tmpDir |
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* |
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* @return array options |
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*/ |
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protected function setGlobalOptions($tmpDir) |
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{ |
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// margins and media size |
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// TODO: allow other units (inches, cms) |
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$marginTop = str_replace('mm', '', $this->app->edition('margin')['top']); |
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$marginBottom = str_replace('mm', '', $this->app->edition('margin')['bottom']); |
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$marginLeft = str_replace('mm', '', $this->app->edition('margin')['inner']); |
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$marginRight = str_replace( |
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'mm', |
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'', |
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isset($this->app->edition('margin')['outer']) ?: $this->app->edition('margin')['outter'] |
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); |
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$orientation = $this->app->edition('orientation') ?: 'portrait'; |
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$newOptions = [ |
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'page-size' => $this->app->edition('page_size'), |
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'margin-top' => $marginTop ?: 25, |
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'margin-bottom' => $marginBottom ?: 25, |
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'margin-left' => $marginLeft ?: 30, |
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'margin-right' => $marginRight ?: 20, |
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'orientation' => $orientation, |
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'encoding' => 'UTF-8', |
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'print-media-type', |
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]; |
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// misc. |
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$newOptions['outline-depth'] = $this->app->edition('toc')['deep']; |
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// dump outline xml for easy outline/toc debugging |
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$newOptions['dump-outline'] = $tmpDir . '/outline.xml'; |
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return $newOptions; |
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} |
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/** |
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* Prepare the stylesheets to use in the book. |
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* |
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* @param $tmpDir |
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* |
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* @return array $options |
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*/ |
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protected function prepareStyleSheet($tmpDir) |
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{ |
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$newOptions = []; |
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// copy the general styles if edition wants them included |
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View Code Duplication |
if ($this->app->edition('include_styles')) { |
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$defaultStyles = $tmpDir . '/default_styles.css'; |
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$this->app->render( |
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'@theme/wkhtmltopdf-style.css.twig', |
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array('resources_dir' => $this->app['app.dir.resources'] . '/'), |
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$defaultStyles |
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); |
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$newOptions['user-style-sheet'] = $defaultStyles; |
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} |
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// get the custom templates for the book |
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$customCss = $this->getCustomCssFile(); |
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// concat it to the general styles or set it as default |
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if (file_exists($customCss)) { |
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if (isset($newOptions['user-style-sheet'])) { |
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$customCssText = file_get_contents($customCss); |
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file_put_contents( |
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$newOptions['user-style-sheet'], |
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"\n/* --- custom styles --- */\n" . $customCssText, |
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FILE_APPEND |
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); |
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} else { |
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$newOptions['user-style-sheet'] = $customCss; |
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} |
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} |
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return $newOptions; |
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} |
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/** |
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* Prepare book items to be rendered, filtering out unuspported types |
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* and extracting certain values. |
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* |
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* @return array options |
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*/ |
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protected function prepareBookItems() |
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{ |
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$extracted = []; |
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$newItems = []; |
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foreach ($this->app['publishing.items'] as $item) { |
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// extract toc title |
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if ($item['config']['element'] === 'toc') { |
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$extracted['toc-title'] = $item['title']; |
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} |
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// exclude unsupported items |
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// - toc: added by wkhtmltopdf |
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// - tof: no way to render with page numbers |
|
323
|
|
|
// - cover: added after document generation |
|
324
|
|
|
if (!in_array($item['config']['element'], ['toc', 'tof', 'cover'])) { |
|
325
|
|
|
$newItems[] = $item; |
|
326
|
|
|
} |
|
327
|
|
|
} |
|
328
|
|
|
|
|
329
|
|
|
$this->app['publishing.items'] = $newItems; |
|
330
|
|
|
|
|
331
|
|
|
return $extracted; |
|
332
|
|
|
} |
|
333
|
|
|
|
|
334
|
|
|
/** |
|
335
|
|
|
* Render header and footer yml file and configure options. |
|
336
|
|
|
* |
|
337
|
|
|
* @param $tmpDir |
|
338
|
|
|
* |
|
339
|
|
|
* @return array options |
|
340
|
|
|
*/ |
|
341
|
|
|
protected function prepareHeaderAndFooter($tmpDir) |
|
342
|
|
|
{ |
|
343
|
|
|
$newOptions = []; |
|
344
|
|
|
|
|
345
|
|
|
$headerFooterFile = $tmpDir . '/header-footer.yml'; |
|
346
|
|
|
$this->app->render( |
|
347
|
|
|
'@theme/wkhtmltopdf-header-footer.yml.twig', |
|
348
|
|
|
[], |
|
349
|
|
|
$headerFooterFile |
|
350
|
|
|
); |
|
351
|
|
|
|
|
352
|
|
|
$values = Yaml::parse(file_get_contents($headerFooterFile)); |
|
353
|
|
|
|
|
354
|
|
|
$newOptions['header-spacing'] = $values['header']['spacing'] ?: 20; |
|
355
|
|
|
$newOptions['header-font-name'] = $values['header']['font-name'] ?: 'sans-serif'; |
|
356
|
|
|
$newOptions['header-font-size'] = $values['header']['font-size'] ?: 12; |
|
357
|
|
|
$newOptions['header-left'] = $values['header']['left'] ?: '[doctitle]'; |
|
358
|
|
|
$newOptions['header-center'] = $values['header']['center'] ?: ''; |
|
359
|
|
|
$newOptions['header-right'] = $values['header']['right'] ?: '[section]'; |
|
360
|
|
|
if ($values['header']['line'] === true) { |
|
361
|
|
|
$newOptions[] = 'header-line'; |
|
362
|
|
|
} else { |
|
363
|
|
|
$newOptions[] = 'no-header-line'; |
|
364
|
|
|
} |
|
365
|
|
|
|
|
366
|
|
|
$newOptions['footer-spacing'] = $values['footer']['spacing'] ?: 20; |
|
367
|
|
|
$newOptions['footer-font-name'] = $values['footer']['font-name'] ?: 'sans-serif'; |
|
368
|
|
|
$newOptions['footer-font-size'] = $values['footer']['font-size'] ?: 12; |
|
369
|
|
|
$newOptions['footer-left'] = $values['footer']['left'] ?: ''; |
|
370
|
|
|
$newOptions['footer-center'] = $values['footer']['center'] ?: '[page]'; |
|
371
|
|
|
$newOptions['footer-right'] = $values['footer']['right'] ?: ''; |
|
372
|
|
|
if ($values['footer']['line'] === true) { |
|
373
|
|
|
$newOptions[] = 'footer-line'; |
|
374
|
|
|
} else { |
|
375
|
|
|
$newOptions[] = 'no-footer-line'; |
|
376
|
|
|
} |
|
377
|
|
|
|
|
378
|
|
|
return $newOptions; |
|
379
|
|
|
} |
|
380
|
|
|
|
|
381
|
|
|
/** |
|
382
|
|
|
* Render the whole book (except excluded items) and set options. |
|
383
|
|
|
* |
|
384
|
|
|
* @param $tmpDir |
|
385
|
|
|
* |
|
386
|
|
|
* @return string |
|
387
|
|
|
*/ |
|
388
|
|
|
protected function renderBook($tmpDir) |
|
389
|
|
|
{ |
|
390
|
|
|
$htmlBookFilePath = $tmpDir . '/book.html'; |
|
391
|
|
|
$this->app->render( |
|
392
|
|
|
'book.twig', |
|
393
|
|
|
[ |
|
394
|
|
|
'items' => $this->app['publishing.items'], |
|
395
|
|
|
'resources_dir' => $this->app['app.dir.resources'] . '/' |
|
396
|
|
|
], |
|
397
|
|
|
$htmlBookFilePath |
|
398
|
|
|
); |
|
399
|
|
|
|
|
400
|
|
|
return $htmlBookFilePath; |
|
401
|
|
|
} |
|
402
|
|
|
|
|
403
|
|
|
/** |
|
404
|
|
|
* Render the cover html file. |
|
405
|
|
|
* |
|
406
|
|
|
* @param $tmpDir |
|
407
|
|
|
* |
|
408
|
|
|
* @return string |
|
409
|
|
|
*/ |
|
410
|
|
|
protected function renderHtmlCover($tmpDir) |
|
411
|
|
|
{ |
|
412
|
|
|
$this->app->edition('has_cover_image', false); |
|
413
|
|
|
|
|
414
|
|
|
$htmlCoverFilePath = $tmpDir . '/cover.html'; |
|
415
|
|
|
$this->app->render( |
|
416
|
|
|
'cover.twig', |
|
417
|
|
|
[], |
|
418
|
|
|
$htmlCoverFilePath |
|
419
|
|
|
); |
|
420
|
|
|
|
|
421
|
|
|
return $htmlCoverFilePath; |
|
422
|
|
|
} |
|
423
|
|
|
|
|
424
|
|
|
/** |
|
425
|
|
|
* Render the TOC html file. |
|
426
|
|
|
* |
|
427
|
|
|
* @param $tmpDir |
|
428
|
|
|
* @param $tocTitle |
|
429
|
|
|
* |
|
430
|
|
|
* @return string |
|
431
|
|
|
* |
|
432
|
|
|
*/ |
|
433
|
|
|
protected function renderToc($tmpDir, $tocTitle) |
|
434
|
|
|
{ |
|
435
|
|
|
$tocFilePath = $tmpDir . '/toc.xsl'; |
|
436
|
|
|
$this->app->render( |
|
437
|
|
|
'wkhtmltopdf-toc.xsl.twig', |
|
438
|
|
|
[ |
|
439
|
|
|
'toc_title' => $tocTitle, |
|
440
|
|
|
'toc_deep' => $this->app->edition('toc')['deep'] |
|
441
|
|
|
], |
|
442
|
|
|
$tocFilePath |
|
443
|
|
|
); |
|
444
|
|
|
|
|
445
|
|
|
return $tocFilePath; |
|
446
|
|
|
} |
|
447
|
|
|
} |
|
448
|
|
|
|