ILIAS  release_5-1 Revision 5.0.0-5477-g43f3e3fab5f
Text_Diff_Engine_xdiff Class Reference
+ Collaboration diagram for Text_Diff_Engine_xdiff:

Public Member Functions

 diff ($from_lines, $to_lines)
 

Detailed Description

Definition at line 255 of file Diff.php.

Member Function Documentation

◆ diff()

Text_Diff_Engine_xdiff::diff (   $from_lines,
  $to_lines 
)

Definition at line 257 of file Diff.php.

258 {
259 /* Convert the two input arrays into strings for xdiff processing. */
260 $from_string = implode("\n", $from_lines);
261 $to_string = implode("\n", $to_lines);
262
263 /* Diff the two strings and convert the result to an array. */
264 $diff = xdiff_string_diff($from_string, $to_string, count($to_lines));
265 $diff = explode("\n", $diff);
266
267 /* Walk through the diff one line at a time. We build the $edits
268 * array of diff operations by reading the first character of the
269 * xdiff output (which is in the "unified diff" format).
270 *
271 * Note that we don't have enough information to detect "changed"
272 * lines using this approach, so we can't add Text_Diff_Op_changed
273 * instances to the $edits array. The result is still perfectly
274 * valid, albeit a little less descriptive and efficient. */
275 $edits = array();
276 foreach ($diff as $line) {
277 switch ($line[0]) {
278 case ' ':
279 $edits[] = new Text_Diff_Op_copy(array(substr($line, 1)));
280 break;
281
282 case '+':
283 $edits[] = new Text_Diff_Op_add(array(substr($line, 1)));
284 break;
285
286 case '-':
287 $edits[] = new Text_Diff_Op_delete(array(substr($line, 1)));
288 break;
289 }
290 }
291
292 return $edits;
293 }

The documentation for this class was generated from the following file: