Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Component\Diff;
Chris@0: 
Chris@0: use Drupal\Component\Diff\Engine\HWLDFWordAccumulator;
Chris@0: 
Chris@0: /**
Chris@0:  * @todo document
Chris@0:  * @private
Chris@0:  * @subpackage DifferenceEngine
Chris@0:  */
Chris@0: class WordLevelDiff extends MappedDiff {
Chris@0: 
Chris@0:   const MAX_LINE_LENGTH = 10000;
Chris@0: 
Chris@0:   public function __construct($orig_lines, $closing_lines) {
Chris@0:     list($orig_words, $orig_stripped) = $this->_split($orig_lines);
Chris@0:     list($closing_words, $closing_stripped) = $this->_split($closing_lines);
Chris@0: 
Chris@0:     parent::__construct($orig_words, $closing_words, $orig_stripped, $closing_stripped);
Chris@0:   }
Chris@0: 
Chris@0:   protected function _split($lines) {
Chris@0:     $words = [];
Chris@0:     $stripped = [];
Chris@0:     $first = TRUE;
Chris@0:     foreach ($lines as $line) {
Chris@0:       // If the line is too long, just pretend the entire line is one big word
Chris@0:       // This prevents resource exhaustion problems
Chris@0:       if ( $first ) {
Chris@0:         $first = FALSE;
Chris@0:       }
Chris@0:       else {
Chris@0:         $words[] = "\n";
Chris@0:         $stripped[] = "\n";
Chris@0:       }
Chris@17:       if (mb_strlen($line) > $this::MAX_LINE_LENGTH) {
Chris@0:         $words[] = $line;
Chris@0:         $stripped[] = $line;
Chris@0:       }
Chris@0:       else {
Chris@0:         if (preg_match_all('/ ( [^\S\n]+ | [0-9_A-Za-z\x80-\xff]+ | . ) (?: (?!< \n) [^\S\n])? /xs', $line, $m)) {
Chris@0:           $words = array_merge($words, $m[0]);
Chris@0:           $stripped = array_merge($stripped, $m[1]);
Chris@0:         }
Chris@0:       }
Chris@0:     }
Chris@0:     return [$words, $stripped];
Chris@0:   }
Chris@0: 
Chris@0:   public function orig() {
Chris@0:     $orig = new HWLDFWordAccumulator();
Chris@0: 
Chris@0:     foreach ($this->edits as $edit) {
Chris@0:       if ($edit->type == 'copy') {
Chris@0:         $orig->addWords($edit->orig);
Chris@0:       }
Chris@0:       elseif ($edit->orig) {
Chris@0:         $orig->addWords($edit->orig, 'mark');
Chris@0:       }
Chris@0:     }
Chris@0:     $lines = $orig->getLines();
Chris@0:     return $lines;
Chris@0:   }
Chris@0: 
Chris@0:   public function closing() {
Chris@0:     $closing = new HWLDFWordAccumulator();
Chris@0: 
Chris@0:     foreach ($this->edits as $edit) {
Chris@0:       if ($edit->type == 'copy') {
Chris@0:         $closing->addWords($edit->closing);
Chris@0:       }
Chris@0:       elseif ($edit->closing) {
Chris@0:         $closing->addWords($edit->closing, 'mark');
Chris@0:       }
Chris@0:     }
Chris@0:     $lines = $closing->getLines();
Chris@0:     return $lines;
Chris@0:   }
Chris@0: 
Chris@0: }