108 lines
2.7 KiB
PHP
108 lines
2.7 KiB
PHP
<?php
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/**
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* Text extractor that calls pdftotext to do the conversion.
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* @author mstephens
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*
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*/
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class PDFTextExtractor extends FileTextExtractor
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{
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public function isAvailable()
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{
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$bin = $this->bin('pdftotext');
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return (file_exists($bin) && is_executable($bin));
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}
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public function supportsExtension($extension)
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{
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return strtolower($extension) === 'pdf';
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}
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public function supportsMime($mime)
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{
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return in_array(
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strtolower($mime),
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array(
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'application/pdf',
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'application/x-pdf',
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'application/x-bzpdf',
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'application/x-gzpdf'
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)
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);
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}
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/**
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* Accessor to get the location of the binary
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*
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* @param string $prog Name of binary
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* @return string
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*/
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protected function bin($prog = '')
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{
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if ($this->config()->binary_location) {
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// By config
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$path = $this->config()->binary_location;
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} elseif (file_exists('/usr/bin/pdftotext')) {
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// By searching common directories
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$path = '/usr/bin';
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} elseif (file_exists('/usr/local/bin/pdftotext')) {
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$path = '/usr/local/bin';
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} else {
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$path = '.'; // Hope it's in path
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}
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return ($path ? $path . '/' : '') . $prog;
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}
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public function getContent($path)
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{
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if (!$path) {
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return "";
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} // no file
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$content = $this->getRawOutput($path);
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return $this->cleanupLigatures($content);
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}
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/**
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* Invoke pdftotext with the given path
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*
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* @param string $path
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* @return string Output
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* @throws FileTextExtractor_Exception
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*/
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protected function getRawOutput($path)
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{
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exec(sprintf('%s %s - 2>&1', $this->bin('pdftotext'), escapeshellarg($path)), $content, $err);
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if ($err) {
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throw new FileTextExtractor_Exception(sprintf(
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'PDFTextExtractor->getContent() failed for %s: %s',
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$path,
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implode('', $err)
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));
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}
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return implode('', $content);
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}
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/**
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* Removes utf-8 ligatures.
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*
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* @link http://en.wikipedia.org/wiki/Typographic_ligature#Computer_typesetting
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*
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* @param string $input
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* @return string
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*/
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protected function cleanupLigatures($input)
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{
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$mapping = array(
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'ff' => 'ff',
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'fi' => 'fi',
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'fl' => 'fl',
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'ffi' => 'ffi',
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'ffl' => 'ffl',
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'ſt' => 'ft',
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'st' => 'st'
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);
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return str_replace(array_keys($mapping), array_values($mapping), $input);
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}
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}
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