private function tryCacheStuff()
{
$whitespace_mode = $this->whitespaceMode;
switch ($whitespace_mode) {
case self::WHITESPACE_SHOW_ALL:
case self::WHITESPACE_IGNORE_TRAILING:
break;
default:
$whitespace_mode = self::WHITESPACE_IGNORE_ALL;
break;
}
$skip_cache = $whitespace_mode != self::WHITESPACE_IGNORE_ALL;
$this->whitespaceMode = $whitespace_mode;
$changeset = $this->changeset;
if ($changeset->getFileType() == DifferentialChangeType::FILE_TEXT || $changeset->getFileType() == DifferentialChangeType::FILE_SYMLINK) {
if ($skip_cache || !$this->loadCache()) {
$ignore_all = $this->whitespaceMode == self::WHITESPACE_IGNORE_ALL;
if ($ignore_all && $changeset->getWhitespaceMatters()) {
$ignore_all = false;
}
// The "ignore all whitespace" algorithm depends on rediffing the
// files, and we currently need complete representations of both
// files to do anything reasonable. If we only have parts of the files,
// don't use the "ignore all" algorithm.
if ($ignore_all) {
$hunks = $changeset->getHunks();
if (count($hunks) !== 1) {
$ignore_all = false;
} else {
$first_hunk = reset($hunks);
if ($first_hunk->getOldOffset() != 1 || $first_hunk->getNewOffset() != 1) {
$ignore_all = false;
}
}
}
if ($ignore_all) {
$old_file = $changeset->makeOldFile();
$new_file = $changeset->makeNewFile();
if ($old_file == $new_file) {
// If the old and new files are exactly identical, the synthetic
// diff below will give us nonsense and whitespace modes are
// irrelevant anyway. This occurs when you, e.g., copy a file onto
// itself in Subversion (see T271).
$ignore_all = false;
}
}
if ($ignore_all) {
// Huge mess. Generate a "-bw" (ignore all whitespace changes) diff,
// parse it out, and then play a shell game with the parsed format
// in process() so we highlight only changed lines but render
// whitespace differences. If we don't do this, we either fail to
// render whitespace changes (which is incredibly confusing,
// especially for python) or often produce a much larger set of
// differences than necessary.
$engine = new PhabricatorDifferenceEngine();
$engine->setIgnoreWhitespace(true);
$no_whitespace_changeset = $engine->generateChangesetFromFileContent($old_file, $new_file);
// subparser takes over the current non-whitespace-ignoring changeset
$subparser = new DifferentialChangesetParser();
$subparser->isSubparser = true;
$subparser->setChangeset($changeset);
foreach ($changeset->getHunks() as $hunk) {
$subparser->parseHunk($hunk);
}
// We need to call process() so that the subparser's values for
// metadata (like 'unchanged') is correct.
$subparser->process();
$this->subparser = $subparser;
// While we aren't updating $this->changeset (since it has a bunch
// of metadata we need to preserve, so that headers like "this file
// was moved" render correctly), we're overwriting the local
// $changeset so that the block below will choose the synthetic
// hunks we've built instead of the original hunks.
$changeset = $no_whitespace_changeset;
}
// This either uses the real hunks, or synthetic hunks we built above.
foreach ($changeset->getHunks() as $hunk) {
$this->parseHunk($hunk);
}
$this->process();
if (!$skip_cache) {
$this->saveCache();
}
}
}
}
