natalie/indefero
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Rewrite the diff parser and reduce the memory footprint.

Browse Source 
The diff parser code was rewritten for clarity and speed and now handles
a couple of ugly cornercases, like SVN's property change output and single
change chunks, much better. Since the path parsing was unified as well,
the SCM interface gained a new method `getPathStripLevel()` which determines
how many path components need to be shoven off a file name for the SCM
to form a valid path in the workspace (similar to patch(1)'s --strip option).
Fixes issue 627. Automated tests follow.
This commit is contained in:
Patrick Georgi 2011-03-16 23:50:41 +01:00 committed by Thomas Keller
parent 6fb9b72e22
commit baa88412b9
7 changed files with 105 additions and 147 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
NEWS.mdtext
View File

@ -52,6 +52,7 @@
- Disable browser autocomplete of password fields in the account settings (issue 616)
- Improvements in the automatic linker parser (issue 618)
- The `createIssue` API method did not check the API authentication (issue 619)
- Reduce the memory footprint and compatibility of the internal diff parser (issue 627)
- Print active git branch heads and tags in bold
## Documentation

198
src/IDF/Diff.php
View File

@ -27,16 +27,14 @@
*/
class IDF_Diff
{
public $repo = '';
public $diff = '';
public $path_strip_level = 0;
protected $lines = array();
public $files = array();
public function __construct($diff, $repo='')
public function __construct($diff, $path_strip_level = 0)
{
$this->repo = $repo;
$this->diff = $diff;
$this->path_strip_level = $path_strip_level;
$this->lines = preg_split("/\015\012|\015|\012/", $diff);
}
@ -49,118 +47,90 @@ class IDF_Diff
$files = array();
$indiff = false; // Used to skip the headers in the git patches
$i = 0; // Used to skip the end of a git patch with --\nversion number
foreach ($this->lines as $line) {
$diffsize = count($this->lines);
while ($i < $diffsize) {
// look for the potential beginning of a diff
if (substr($this->lines[$i], 0, 4) !== '--- ') {
$i++;
if (0 === strpos($line, '--') and isset($this->lines[$i])
and preg_match('/^\d+\.\d+\.\d+\.\d+$/', $this->lines[$i])) {
continue;
}
// we're inside a diff candiate
$oldfileline = $this->lines[$i++];
$newfileline = $this->lines[$i++];
if (substr($newfileline, 0, 4) !== '+++ ') {
// not a valid diff here, move on
continue;
}
// use new file name by default
preg_match("/^\+\+\+ ([^\t]+)/", $newfileline, $m);
$current_file = $m[1];
if ($current_file === '/dev/null') {
// except if it's /dev/null, use the old one instead
// eg. mtn 0.48 and newer
preg_match("/^--- ([^\t]+)/", $oldfileline, $m);
$current_file = $m[1];
}
if ($this->path_strip_level > 0) {
$current_file = array_pop(explode('/', $current_file, $this->path_strip_level+1));
}
$current_chunk = 0;
$files[$current_file] = array();
$files[$current_file]['chunks'] = array();
$files[$current_file]['chunks_def'] = array();
while ($i < $diffsize && substr($this->lines[$i], 0, 3) === '@@ ') {
$elems = preg_match('/@@ -(\d+),?(\d*) \+(\d+),?(\d*) @@.*/',
$this->lines[$i++], $results);
if ($elems != 1) {
// hunk is badly formatted
break;
}
if (0 === strpos($line, 'diff --git a')) {
$current_file = self::getFile($line);
$files[$current_file] = array();
$files[$current_file]['chunks'] = array();
$files[$current_file]['chunks_def'] = array();
$current_chunk = 0;
$indiff = true;
continue;
} else if (preg_match('#^diff -r [^\s]+ -r [^\s]+ (.+)$#', $line, $matches)) {
$current_file = $matches[1];
$files[$current_file] = array();
$files[$current_file]['chunks'] = array();
$files[$current_file]['chunks_def'] = array();
$current_chunk = 0;
$indiff = true;
continue;
} else if (!$indiff && 0 === strpos($line, '=========')) {
// ignore pseudo stanzas with a hint of a binary file
if (preg_match("/^# (.+) is binary/", $this->lines[$i]))
continue;
// by default always use the new name of a possibly renamed file
$current_file = self::getMtnFile($this->lines[$i+1]);
// mtn 0.48 and newer set /dev/null as file path for dropped files
// so we display the old name here
if ($current_file == "/dev/null") {
$current_file = self::getMtnFile($this->lines[$i]);
}
if ($current_file == "/dev/null") {
throw new Exception(
"could not determine path from diff"
);
}
$files[$current_file] = array();
$files[$current_file]['chunks'] = array();
$files[$current_file]['chunks_def'] = array();
$current_chunk = 0;
$indiff = true;
continue;
} else if (0 === strpos($line, 'Index: ')) {
$current_file = self::getSvnFile($line);
$files[$current_file] = array();
$files[$current_file]['chunks'] = array();
$files[$current_file]['chunks_def'] = array();
$current_chunk = 0;
$indiff = true;
continue;
}
if (!$indiff) {
continue;
}
if (0 === strpos($line, '@@ ')) {
$files[$current_file]['chunks_def'][] = self::getChunk($line);
$delstart = $results[1];
$dellines = $results[2] === '' ? 1 : $results[2];
$addstart = $results[3];
$addlines = $results[4] === '' ? 1 : $results[4];
$chunks_def = array(array($delstart), array($addstart));
if ($results[2] != '') $chunks_def[0][] = $dellines;
if ($results[4] != '') $chunks_def[1][] = $addlines;
$files[$current_file]['chunks_def'][] = $chunks_def;
$files[$current_file]['chunks'][] = array();
while ($addlines >= 0 || $dellines >= 0) {
$linetype = $this->lines[$i] != '' ? $this->lines[$i][0] : ' ';
switch ($linetype) {
case ' ':
$files[$current_file]['chunks'][$current_chunk][] =
array($delstart, $addstart, substr($this->lines[$i++], 1));
$dellines--;
$addlines--;
$delstart++;
$addstart++;
break;
case '+':
$files[$current_file]['chunks'][$current_chunk][] =
array('', $addstart, substr($this->lines[$i++], 1));
$addlines--;
$addstart++;
break;
case '-':
$files[$current_file]['chunks'][$current_chunk][] =
array($delstart, '', substr($this->lines[$i++], 1));
$dellines--;
$delstart++;
break;
default:
break 2;
}
}
$current_chunk++;
$lline = $files[$current_file]['chunks_def'][$current_chunk-1][0][0];
$rline = $files[$current_file]['chunks_def'][$current_chunk-1][1][0];
continue;
}
if (0 === strpos($line, '---') or 0 === strpos($line, '+++')) {
continue;
}
if (0 === strpos($line, '-')) {
$files[$current_file]['chunks'][$current_chunk-1][] = array($lline, '', substr($line, 1));
$lline++;
continue;
}
if (0 === strpos($line, '+')) {
$files[$current_file]['chunks'][$current_chunk-1][] = array('', $rline, substr($line, 1));
$rline++;
continue;
}
if (0 === strpos($line, ' ')) {
$files[$current_file]['chunks'][$current_chunk-1][] = array($lline, $rline, substr($line, 1));
$rline++;
$lline++;
continue;
}
if ($line == '') {
$files[$current_file]['chunks'][$current_chunk-1][] = array($lline, $rline, $line);
$rline++;
$lline++;
continue;
}
}
$this->files = $files;
return $files;
}
public static function getFile($line)
{
$line = substr(trim($line), 10);
$n = (int) strlen($line)/2;
return trim(substr($line, 3, $n-3));
}
public static function getSvnFile($line)
{
return substr(trim($line), 7);
}
public static function getMtnFile($line)
{
preg_match("/^[+-]{3} ([^\t]+)/", $line, $m);
return $m[1];
}
/**
* Return the html version of a parsed diff.
*/
@ -197,7 +167,6 @@ class IDF_Diff
return Pluf_Template::markSafe($out);
}
public static function padLine($line)
{
$line = str_replace("\t", ' ', $line);
@ -210,19 +179,6 @@ class IDF_Diff
return str_repeat('&nbsp;', $i).substr($line, $i);
}
/**
* @return array array(array(start, n), array(start, n))
*/
public static function getChunk($line)
{
$elts = explode(' ', $line);
$res = array();
for ($i=1;$i<3;$i++) {
$res[] = explode(',', trim(substr($elts[$i], 1)));
}
return $res;
}
/**
* Review patch.
*
@ -347,7 +303,6 @@ class IDF_Diff
return $nnew_chunks;
}
public function renderCompared($chunks, $filename)
{
$fileinfo = IDF_FileUtil::getMimeType($filename);
@ -381,6 +336,5 @@ class IDF_Diff
$i++;
}
return Pluf_Template::markSafe($out);
}
}

9
src/IDF/Scm.php
View File

@ -473,5 +473,14 @@ class IDF_Scm
{
return str_replace('%2F', '/', rawurlencode($path));
}
/**
* Returns the number of slashes and preceeding path components
* that should be stripped from paths in the SCM's diff output
*/
public function getDiffPathStripLevel()
{
return 0;
}
}

8
src/IDF/Scm/Git.php
View File

@ -649,6 +649,14 @@ class IDF_Scm_Git extends IDF_Scm
return new Pluf_HTTP_Response_CommandPassThru($cmd, 'application/x-zip');
}
/**
* @see IDF_Scm::getDiffPathStripLevel()
*/
public function getDiffPathStripLevel()
{
return 1;
}
/*
* =====================================================
* Specific Git Commands

8
src/IDF/Scm/Mercurial.php
View File

@ -464,4 +464,12 @@ class IDF_Scm_Mercurial extends IDF_Scm
escapeshellarg($commit));
return new Pluf_HTTP_Response_CommandPassThru($cmd, 'application/x-zip');
}
/**
* @see IDF_Scm::getDiffPathStripLevel()
*/
public function getDiffPathStripLevel()
{
return 1;
}
}

23
src/IDF/Tests/TestDiff.php
View File

@ -32,29 +32,6 @@ class IDF_Tests_TestDiff extends UnitTestCase
parent::__construct('Test the diff parser.');
}
public function testGetFile()
{
$lines = array(
'diff --git a/src/IDF/Form/Register.php b/src/IDF/Form/Register.php',
'diff --git a/src/IDF/Form/RegisterConfirmation.php b/src/IDF/Form/RegisterConfirmation.php',
'diff --git a/src/IDF/Form/RegisterInputKey.php b/src/IDF/Form/RegisterInputKey.php',
'diff --git a/src/IDF/Views.php b/src/IDF/Views.php',
'diff --git a/src/IDF/conf/views.php b/src/IDF/conf/views.php',
);
$files = array(
'src/IDF/Form/Register.php',
'src/IDF/Form/RegisterConfirmation.php',
'src/IDF/Form/RegisterInputKey.php',
'src/IDF/Views.php',
'src/IDF/conf/views.php',
);
$i = 0;
foreach ($lines as $line) {
$this->assertEqual($files[$i], IDF_Diff::getFile($line));
$i++;
}
}
public function testBinaryDiff()
{
$diff_content = file_get_contents(dirname(__FILE__).'/test-diff.diff');

3
src/IDF/Views/Source.php
View File

@ -303,7 +303,8 @@ class IDF_Views_Source
$title = sprintf(__('%s Commit Details'), (string) $request->project);
$page_title = sprintf(__('%s Commit Details - %s'), (string) $request->project, $commit);
$rcommit = IDF_Commit::getOrAdd($cobject, $request->project);
$diff = new IDF_Diff($cobject->diff);
$diff = new IDF_Diff($cobject->diff, $scm->getDiffPathStripLevel());
$cobject->diff = null;
$diff->parse();
$scmConf = $request->conf->getVal('scm', 'git');
try {