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<?php |
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/** |
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* (c) Kitodo. Key to digital objects e.V. <[email protected]> |
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* |
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* This file is part of the Kitodo and TYPO3 projects. |
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* |
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* @license GNU General Public License version 3 or later. |
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* For the full copyright and license information, please read the |
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* LICENSE.txt file that was distributed with this source code. |
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*/ |
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namespace Kitodo\Dlf\Format; |
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/** |
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* Fulltext ALTO format class for the 'dlf' extension |
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* |
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* ** This currently supports only ALTO 2.x ** |
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* |
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* @author Sebastian Meyer <[email protected]> |
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* @package TYPO3 |
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* @subpackage dlf |
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* @access public |
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*/ |
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class Alto implements \Kitodo\Dlf\Common\FulltextInterface |
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{ |
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/** |
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* This extracts the fulltext data from ALTO XML |
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* |
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* @access public |
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* |
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* @param \SimpleXMLElement $xml: The XML to extract the raw text from |
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* |
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* @return string The raw unformatted fulltext |
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*/ |
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public function getRawText(\SimpleXMLElement $xml) |
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{ |
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$rawText = ''; |
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$xml->registerXPathNamespace('alto', 'http://www.loc.gov/standards/alto/ns-v2#'); |
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// Get all (presumed) words of the text. |
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$words = $xml->xpath('./alto:Layout/alto:Page/alto:PrintSpace//alto:TextBlock/alto:TextLine/alto:String/@CONTENT'); |
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if (!empty($words)) { |
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$rawText = implode(' ', $words); |
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} |
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return $rawText; |
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} |
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/** |
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* This extracts the fulltext data from ALTO XML and returns it in MiniOCR format |
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* |
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* @access public |
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* |
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* @param \SimpleXMLElement $xml: The XML to extract the raw text from |
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* |
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* @return string The unformatted fulltext in MiniOCR format |
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*/ |
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public function getTextAsMiniOcr(\SimpleXMLElement $xml) |
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{ |
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$xml->registerXPathNamespace('alto', 'http://www.loc.gov/standards/alto/ns-v2#'); |
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// get all text blocks |
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$blocks = $xml->xpath('./alto:Layout/alto:Page/alto:PrintSpace//alto:TextBlock'); |
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if (empty($blocks)) { |
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return ''; |
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} |
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$miniOcr = new \SimpleXMLElement("<ocr></ocr>"); |
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foreach ($blocks as $block) { |
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$newBlock = $miniOcr->addChild('b'); |
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foreach ($block->children() as $key => $value) { |
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if ($key === "TextLine") { |
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$newLine = $newBlock->addChild('l'); |
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foreach ($value->children() as $wordKey => $word) { |
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if ($wordKey == "String") { |
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$attributes = $word->attributes(); |
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$newWord = $newLine->addChild('w', $this->getWord($attributes)); |
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$newWord->addAttribute('x', $this->getCoordinates($attributes)); |
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} |
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} |
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} |
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} |
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} |
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$miniOcrXml = $miniOcr->asXml(); |
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if (\is_string($miniOcrXml)) { |
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return $miniOcrXml; |
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} |
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return ''; |
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} |
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/** |
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* This extracts and parses the word from attribute |
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* |
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* @access private |
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* |
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* @param \SimpleXMLElement $attributes: The XML to extract the word |
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* |
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* @return string The parsed word extracted from attribute |
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*/ |
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private function getWord($attributes) |
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{ |
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return htmlspecialchars((string) $attributes['CONTENT']) . ' '; |
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} |
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/** |
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* This extracts and parses the word coordinates from attributes |
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* |
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* @access private |
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* |
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* @param \SimpleXMLElement $attributes: The XML to extract the word coordinates |
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* |
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* @return string The parsed word coordinates extracted from attribute |
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*/ |
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private function getCoordinates($attributes) |
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{ |
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return (string) $attributes['HPOS'] . ' ' . (string) $attributes['VPOS'] . ' ' . (string) $attributes['WIDTH'] . ' ' . (string) $attributes['HEIGHT']; |
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} |
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} |
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kitodo /
kitodo-presentation
