diff core/lib/Drupal/Component/Diff/WordLevelDiff.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Component/Diff/WordLevelDiff.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,82 @@
+<?php
+
+namespace Drupal\Component\Diff;
+
+use Drupal\Component\Diff\Engine\HWLDFWordAccumulator;
+use Drupal\Component\Utility\Unicode;
+
+/**
+ * @todo document
+ * @private
+ * @subpackage DifferenceEngine
+ */
+class WordLevelDiff extends MappedDiff {
+
+  const MAX_LINE_LENGTH = 10000;
+
+  public function __construct($orig_lines, $closing_lines) {
+    list($orig_words, $orig_stripped) = $this->_split($orig_lines);
+    list($closing_words, $closing_stripped) = $this->_split($closing_lines);
+
+    parent::__construct($orig_words, $closing_words, $orig_stripped, $closing_stripped);
+  }
+
+  protected function _split($lines) {
+    $words = [];
+    $stripped = [];
+    $first = TRUE;
+    foreach ($lines as $line) {
+      // If the line is too long, just pretend the entire line is one big word
+      // This prevents resource exhaustion problems
+      if ( $first ) {
+        $first = FALSE;
+      }
+      else {
+        $words[] = "\n";
+        $stripped[] = "\n";
+      }
+      if (Unicode::strlen($line) > $this::MAX_LINE_LENGTH) {
+        $words[] = $line;
+        $stripped[] = $line;
+      }
+      else {
+        if (preg_match_all('/ ( [^\S\n]+ | [0-9_A-Za-z\x80-\xff]+ | . ) (?: (?!< \n) [^\S\n])? /xs', $line, $m)) {
+          $words = array_merge($words, $m[0]);
+          $stripped = array_merge($stripped, $m[1]);
+        }
+      }
+    }
+    return [$words, $stripped];
+  }
+
+  public function orig() {
+    $orig = new HWLDFWordAccumulator();
+
+    foreach ($this->edits as $edit) {
+      if ($edit->type == 'copy') {
+        $orig->addWords($edit->orig);
+      }
+      elseif ($edit->orig) {
+        $orig->addWords($edit->orig, 'mark');
+      }
+    }
+    $lines = $orig->getLines();
+    return $lines;
+  }
+
+  public function closing() {
+    $closing = new HWLDFWordAccumulator();
+
+    foreach ($this->edits as $edit) {
+      if ($edit->type == 'copy') {
+        $closing->addWords($edit->closing);
+      }
+      elseif ($edit->closing) {
+        $closing->addWords($edit->closing, 'mark');
+      }
+    }
+    $lines = $closing->getLines();
+    return $lines;
+  }
+
+}