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1 <?php
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2
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3 namespace Drupal\Component\Diff;
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4
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5 use Drupal\Component\Diff\Engine\HWLDFWordAccumulator;
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6
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7 /**
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8 * @todo document
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9 * @private
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10 * @subpackage DifferenceEngine
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11 */
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12 class WordLevelDiff extends MappedDiff {
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13
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14 const MAX_LINE_LENGTH = 10000;
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15
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16 public function __construct($orig_lines, $closing_lines) {
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17 list($orig_words, $orig_stripped) = $this->_split($orig_lines);
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18 list($closing_words, $closing_stripped) = $this->_split($closing_lines);
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19
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20 parent::__construct($orig_words, $closing_words, $orig_stripped, $closing_stripped);
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21 }
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22
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23 protected function _split($lines) {
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24 $words = [];
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25 $stripped = [];
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26 $first = TRUE;
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27 foreach ($lines as $line) {
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28 // If the line is too long, just pretend the entire line is one big word
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29 // This prevents resource exhaustion problems
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30 if ( $first ) {
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31 $first = FALSE;
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32 }
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33 else {
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34 $words[] = "\n";
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35 $stripped[] = "\n";
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36 }
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37 if (mb_strlen($line) > $this::MAX_LINE_LENGTH) {
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38 $words[] = $line;
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39 $stripped[] = $line;
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40 }
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41 else {
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42 if (preg_match_all('/ ( [^\S\n]+ | [0-9_A-Za-z\x80-\xff]+ | . ) (?: (?!< \n) [^\S\n])? /xs', $line, $m)) {
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43 $words = array_merge($words, $m[0]);
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44 $stripped = array_merge($stripped, $m[1]);
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45 }
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46 }
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47 }
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48 return [$words, $stripped];
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49 }
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50
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51 public function orig() {
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52 $orig = new HWLDFWordAccumulator();
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53
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54 foreach ($this->edits as $edit) {
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55 if ($edit->type == 'copy') {
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56 $orig->addWords($edit->orig);
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57 }
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58 elseif ($edit->orig) {
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59 $orig->addWords($edit->orig, 'mark');
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60 }
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61 }
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62 $lines = $orig->getLines();
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63 return $lines;
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64 }
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65
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66 public function closing() {
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67 $closing = new HWLDFWordAccumulator();
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68
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69 foreach ($this->edits as $edit) {
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70 if ($edit->type == 'copy') {
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71 $closing->addWords($edit->closing);
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72 }
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73 elseif ($edit->closing) {
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74 $closing->addWords($edit->closing, 'mark');
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75 }
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76 }
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77 $lines = $closing->getLines();
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78 return $lines;
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79 }
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80
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81 }
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