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phorge-phorge/src/applications/differential/parser/DifferentialChangesetParser.php

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<?php
final class DifferentialChangesetParser {
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protected $visible = array();
protected $new = array();
protected $old = array();
protected $intra = array();
protected $newRender = null;
protected $oldRender = null;
protected $filename = null;
protected $missingOld = array();
protected $missingNew = array();
protected $comments = array();
protected $specialAttributes = array();
protected $changeset;
protected $whitespaceMode = null;
protected $renderCacheKey = null;
private $handles = array();
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private $user;
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private $leftSideChangesetID;
private $leftSideAttachesToNewFile;
private $rightSideChangesetID;
private $rightSideAttachesToNewFile;
private $originalLeft;
private $originalRight;
private $renderingReference;
private $isSubparser;
private $isTopLevel;
private $coverage;
private $markupEngine;
private $highlightErrors;
const CACHE_VERSION = 8;
const CACHE_MAX_SIZE = 8e6;
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const ATTR_GENERATED = 'attr:generated';
const ATTR_DELETED = 'attr:deleted';
const ATTR_UNCHANGED = 'attr:unchanged';
const ATTR_WHITELINES = 'attr:white';
const LINES_CONTEXT = 8;
const WHITESPACE_SHOW_ALL = 'show-all';
const WHITESPACE_IGNORE_TRAILING = 'ignore-trailing';
// TODO: This is now "Ignore Most" in the UI.
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const WHITESPACE_IGNORE_ALL = 'ignore-all';
const WHITESPACE_IGNORE_FORCE = 'ignore-force';
public function setOldLines(array $lines) {
$this->old = $lines;
return $this;
}
public function setNewLines(array $lines) {
$this->new = $lines;
return $this;
}
public function setSpecialAttributes(array $attributes) {
$this->specialAttributes = $attributes;
return $this;
}
public function setMissingNewLineMarkerMap(array $map) {
$this->missingNew = $map;
return $this;
}
public function setMissingOldLineMarkerMap(array $map) {
$this->missingOld = $map;
return $this;
}
public function setIntraLineDiffs(array $diffs) {
$this->intra = $diffs;
return $this;
}
public function setVisibileLinesMask(array $mask) {
$this->visible = $mask;
return $this;
}
/**
* Configure which Changeset comments added to the right side of the visible
* diff will be attached to. The ID must be the ID of a real Differential
* Changeset.
*
* The complexity here is that we may show an arbitrary side of an arbitrary
* changeset as either the left or right part of a diff. This method allows
* the left and right halves of the displayed diff to be correctly mapped to
* storage changesets.
*
* @param id The Differential Changeset ID that comments added to the right
* side of the visible diff should be attached to.
* @param bool If true, attach new comments to the right side of the storage
* changeset. Note that this may be false, if the left side of
* some storage changeset is being shown as the right side of
* a display diff.
* @return this
*/
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public function setRightSideCommentMapping($id, $is_new) {
$this->rightSideChangesetID = $id;
$this->rightSideAttachesToNewFile = $is_new;
return $this;
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}
/**
* See setRightSideCommentMapping(), but this sets information for the left
* side of the display diff.
*/
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public function setLeftSideCommentMapping($id, $is_new) {
$this->leftSideChangesetID = $id;
$this->leftSideAttachesToNewFile = $is_new;
return $this;
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}
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public function setOriginals(
DifferentialChangeset $left,
DifferentialChangeset $right) {
$this->originalLeft = $left;
$this->originalRight = $right;
}
public function diffOriginals() {
$engine = new PhabricatorDifferenceEngine();
$changeset = $engine->generateChangesetFromFileContent(
implode('', mpull($this->originalLeft->getHunks(), 'getChanges')),
implode('', mpull($this->originalRight->getHunks(), 'getChanges')));
$parser = new DifferentialHunkParser();
return $parser->parseHunksForHighlightMasks(
$changeset->getHunks(),
$this->originalLeft->getHunks(),
$this->originalRight->getHunks()
);
}
/**
* Set a key for identifying this changeset in the render cache. If set, the
* parser will attempt to use the changeset render cache, which can improve
* performance for frequently-viewed changesets.
*
* By default, there is no render cache key and parsers do not use the cache.
* This is appropriate for rarely-viewed changesets.
*
* NOTE: Currently, this key must be a valid Differential Changeset ID.
*
* @param string Key for identifying this changeset in the render cache.
* @return this
*/
public function setRenderCacheKey($key) {
$this->renderCacheKey = $key;
return $this;
}
private function getRenderCacheKey() {
return $this->renderCacheKey;
}
public function setChangeset(DifferentialChangeset $changeset) {
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$this->changeset = $changeset;
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$this->setFilename($changeset->getFilename());
return $this;
}
public function setWhitespaceMode($whitespace_mode) {
$this->whitespaceMode = $whitespace_mode;
return $this;
}
public function setRenderingReference($ref) {
$this->renderingReference = $ref;
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return $this;
}
private function getRenderingReference() {
return $this->renderingReference;
}
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public function getChangeset() {
return $this->changeset;
}
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public function setFilename($filename) {
$this->filename = $filename;
return $this;
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}
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public function setHandles(array $handles) {
assert_instances_of($handles, 'PhabricatorObjectHandle');
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$this->handles = $handles;
return $this;
}
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public function setMarkupEngine(PhabricatorMarkupEngine $engine) {
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$this->markupEngine = $engine;
return $this;
}
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public function setUser(PhabricatorUser $user) {
$this->user = $user;
return $this;
}
public function setCoverage($coverage) {
$this->coverage = $coverage;
return $this;
}
private function getCoverage() {
return $this->coverage;
}
public function parseInlineComment(
PhabricatorInlineCommentInterface $comment) {
// Parse only comments which are actually visible.
if ($this->isCommentVisibleOnRenderedDiff($comment)) {
$this->comments[] = $comment;
}
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return $this;
}
private function loadCache() {
$render_cache_key = $this->getRenderCacheKey();
if (!$render_cache_key) {
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return false;
}
$data = null;
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$changeset = new DifferentialChangeset();
$conn_r = $changeset->establishConnection('r');
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$data = queryfx_one(
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$conn_r,
'SELECT * FROM %T WHERE id = %d',
$changeset->getTableName().'_parse_cache',
$render_cache_key);
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if (!$data) {
return false;
}
$data = json_decode($data['cache'], true);
if (!is_array($data) || !$data) {
return false;
}
foreach (self::getCacheableProperties() as $cache_key) {
if (!array_key_exists($cache_key, $data)) {
// If we're missing a cache key, assume we're looking at an old cache
// and ignore it.
return false;
}
}
if ($data['cacheVersion'] !== self::CACHE_VERSION) {
return false;
}
// Someone displays contents of a partially cached shielded file.
if (!isset($data['newRender']) && (!$this->isTopLevel || $this->comments)) {
return false;
}
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unset($data['cacheVersion'], $data['cacheHost']);
$cache_prop = array_select_keys($data, self::getCacheableProperties());
foreach ($cache_prop as $cache_key => $v) {
$this->$cache_key = $v;
}
return true;
}
protected static function getCacheableProperties() {
return array(
'visible',
'new',
'old',
'intra',
'newRender',
'oldRender',
'specialAttributes',
'missingOld',
'missingNew',
'cacheVersion',
'cacheHost',
);
}
public function saveCache() {
if ($this->highlightErrors) {
return false;
}
$render_cache_key = $this->getRenderCacheKey();
if (!$render_cache_key) {
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return false;
}
$cache = array();
foreach (self::getCacheableProperties() as $cache_key) {
switch ($cache_key) {
case 'cacheVersion':
$cache[$cache_key] = self::CACHE_VERSION;
break;
case 'cacheHost':
$cache[$cache_key] = php_uname('n');
break;
default:
$cache[$cache_key] = $this->$cache_key;
break;
}
}
$cache = json_encode($cache);
// We don't want to waste too much space by a single changeset.
if (strlen($cache) > self::CACHE_MAX_SIZE) {
return;
}
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try {
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$changeset = new DifferentialChangeset();
$conn_w = $changeset->establishConnection('w');
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
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queryfx(
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$conn_w,
'INSERT INTO %T (id, cache, dateCreated) VALUES (%d, %s, %d)
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ON DUPLICATE KEY UPDATE cache = VALUES(cache)',
DifferentialChangeset::TABLE_CACHE,
$render_cache_key,
$cache,
time());
} catch (AphrontQueryException $ex) {
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// TODO: uhoh
}
}
private function markGenerated($new_corpus_block = '') {
$generated_guess = (strpos($new_corpus_block, '@'.'generated') !== false);
if (!$generated_guess) {
$config_key = 'differential.generated-paths';
$generated_path_regexps = PhabricatorEnv::getEnvConfig($config_key);
foreach ($generated_path_regexps as $regexp) {
if (preg_match($regexp, $this->changeset->getFilename())) {
$generated_guess = true;
break;
}
}
}
$event = new PhabricatorEvent(
PhabricatorEventType::TYPE_DIFFERENTIAL_WILLMARKGENERATED,
array(
'corpus' => $new_corpus_block,
'is_generated' => $generated_guess,
)
);
PhutilEventEngine::dispatchEvent($event);
$generated = $event->getValue('is_generated');
$this->specialAttributes[self::ATTR_GENERATED] = $generated;
}
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public function isGenerated() {
return idx($this->specialAttributes, self::ATTR_GENERATED, false);
}
public function isDeleted() {
return idx($this->specialAttributes, self::ATTR_DELETED, false);
}
public function isUnchanged() {
return idx($this->specialAttributes, self::ATTR_UNCHANGED, false);
}
public function isWhitespaceOnly() {
return idx($this->specialAttributes, self::ATTR_WHITELINES, false);
}
private function applyIntraline(&$render, $intra, $corpus) {
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foreach ($render as $key => $text) {
if (isset($intra[$key])) {
$render[$key] = ArcanistDiffUtils::applyIntralineDiff(
$text,
$intra[$key]);
}
}
}
private function getHighlightFuture($corpus) {
if (preg_match('/\r(?!\n)/', $corpus)) {
// TODO: Pygments converts "\r" newlines into "\n" newlines, so we can't
// use it on files with "\r" newlines. If we have "\r" not followed by
// "\n" in the file, skip highlighting.
$result = phutil_escape_html($corpus);
return new ImmediateFuture($result);
}
return $this->highlightEngine->getHighlightFuture(
$this->highlightEngine->getLanguageFromFilename($this->filename),
$corpus);
}
protected function processHighlightedSource($data, $result) {
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$result_lines = phutil_split_lines($result);
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foreach ($data as $key => $info) {
if (!$info) {
unset($result_lines[$key]);
}
}
return $result_lines;
}
private function tryCacheStuff() {
$whitespace_mode = $this->whitespaceMode;
switch ($whitespace_mode) {
case self::WHITESPACE_SHOW_ALL:
case self::WHITESPACE_IGNORE_TRAILING:
case self::WHITESPACE_IGNORE_FORCE:
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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) {
$this->markGenerated();
} else {
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if ($skip_cache || !$this->loadCache()) {
$this->process();
if (!$skip_cache) {
$this->saveCache();
}
}
}
}
private function process() {
$whitespace_mode = $this->whitespaceMode;
$changeset = $this->changeset;
$ignore_all = (($whitespace_mode == self::WHITESPACE_IGNORE_ALL) ||
($whitespace_mode == self::WHITESPACE_IGNORE_FORCE));
$force_ignore = ($whitespace_mode == self::WHITESPACE_IGNORE_FORCE);
if (!$force_ignore) {
if ($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;
}
}
$old_text = array();
$new_text = array();
$is_unchanged = null;
$whitelines = null;
if ($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
// later 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);
$hunk_parser = new DifferentialHunkParser();
$hunk_parser->parseHunksForLineData($changeset->getHunks());
$hunk_parser->reparseHunksForSpecialAttributes();
$is_unchanged = $hunk_parser->getIsUnchanged();
$whitelines = $hunk_parser->getHasWhiteLines();
// 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;
// let the games continue - pull out the proper text so we can
// later accurately display the diff
$old_text = ipull($hunk_parser->getOldLines(), 'text', 'line');
$new_text = ipull($hunk_parser->getNewLines(), 'text', 'line');
}
// This either uses the real hunks, or synthetic hunks we built above.
// $is_unchanged, $whitelines, $old_text and $new_text are populated
// for synthetic hunks, otherwise they are default values.
$hunk_parser = new DifferentialHunkParser();
$hunk_parser->parseHunksForLineData($changeset->getHunks());
$hunk_parser->reparseHunksForSpecialAttributes();
$unchanged = false;
// i.e. if we didn't have to play horrendous games above
if ($is_unchanged === null) {
if ($hunk_parser->getIsUnchanged()) {
$filetype = $this->changeset->getFileType();
if ($filetype == DifferentialChangeType::FILE_TEXT ||
$filetype == DifferentialChangeType::FILE_SYMLINK) {
$unchanged = true;
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}
}
$whitelines = $hunk_parser->getHasWhiteLines();
} else {
$unchanged = $is_unchanged;
}
$changetype = $this->changeset->getChangeType();
if ($changetype == DifferentialChangeType::TYPE_MOVE_AWAY) {
// sometimes we show moved files as unchanged, sometimes deleted,
// and sometimes inconsistent with what actually happened at the
// destination of the move. Rather than make a false claim,
// omit the 'not changed' notice if this is the source of a move
$unchanged = false;
}
$this->setSpecialAttributes(array(
self::ATTR_UNCHANGED => $unchanged,
self::ATTR_DELETED => $hunk_parser->getIsDeleted(),
self::ATTR_WHITELINES => $whitelines
));
$hunk_parser->updateParsedHunksText($old_text, $new_text);
$hunk_parser->generateIntraLineDiffs();
$hunk_parser->generateVisibileLinesMask();
$this->setOldLines($hunk_parser->getOldLines());
$this->setNewLines($hunk_parser->getNewLines());
$this->setIntraLineDiffs($hunk_parser->getIntraLineDiffs());
$this->setVisibileLinesMask($hunk_parser->getVisibleLinesMask());
$new_corpus = $hunk_parser->getNewCorpus();
$new_corpus_block = implode('', $new_corpus);
$this->markGenerated($new_corpus_block);
if ($this->isTopLevel &&
!$this->comments &&
($this->isGenerated() ||
$this->isUnchanged() ||
$this->isDeleted())) {
return;
}
$old_corpus = $hunk_parser->getOldCorpus();
$old_corpus_block = implode('', $old_corpus);
$old_future = $this->getHighlightFuture($old_corpus_block);
$new_future = $this->getHighlightFuture($new_corpus_block);
$futures = array(
'old' => $old_future,
'new' => $new_future,
);
$corpus_blocks = array(
'old' => $old_corpus_block,
'new' => $new_corpus_block,
);
$this->highlightErrors = false;
foreach (Futures($futures) as $key => $future) {
try {
try {
$highlighted = $future->resolve();
} catch (PhutilSyntaxHighlighterException $ex) {
$this->highlightErrors = true;
$highlighted = id(new PhutilDefaultSyntaxHighlighter())
->getHighlightFuture($corpus_blocks[$key])
->resolve();
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}
switch ($key) {
case 'old':
$this->oldRender = $this->processHighlightedSource(
$this->old,
$highlighted);
break;
case 'new':
$this->newRender = $this->processHighlightedSource(
$this->new,
$highlighted);
break;
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}
} catch (Exception $ex) {
phlog($ex);
throw $ex;
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}
}
$this->applyIntraline(
$this->oldRender,
ipull($this->intra, 0),
$old_corpus);
$this->applyIntraline(
$this->newRender,
ipull($this->intra, 1),
$new_corpus);
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}
private function shouldRenderPropertyChangeHeader($changeset) {
if (!$this->isTopLevel) {
// We render properties only at top level; otherwise we get multiple
// copies of them when a user clicks "Show More".
return false;
}
$old = $changeset->getOldProperties();
$new = $changeset->getNewProperties();
if ($old === $new) {
return false;
}
if ($changeset->getChangeType() == DifferentialChangeType::TYPE_ADD &&
$new == array('unix:filemode' => '100644')) {
return false;
}
if ($changeset->getChangeType() == DifferentialChangeType::TYPE_DELETE &&
$old == array('unix:filemode' => '100644')) {
return false;
}
return true;
}
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public function render(
$range_start = null,
$range_len = null,
$mask_force = array()) {
// "Top level" renders are initial requests for the whole file, versus
// requests for a specific range generated by clicking "show more". We
// generate property changes and "shield" UI elements only for toplevel
// requests.
$this->isTopLevel = (($range_start === null) && ($range_len === null));
$this->highlightEngine = PhabricatorSyntaxHighlighter::newEngine();
$this->tryCacheStuff();
$render_pch = $this->shouldRenderPropertyChangeHeader($this->changeset);
$rows = max(
count($this->old),
count($this->new));
$renderer = id(new DifferentialChangesetTwoUpRenderer())
->setChangeset($this->changeset)
->setRenderPropertyChangeHeader($render_pch)
->setLineCount($rows)
->setOldRender($this->oldRender)
->setNewRender($this->newRender)
->setMissingOldLines($this->missingOld)
->setMissingNewLines($this->missingNew)
->setOldChangesetID($this->leftSideChangesetID)
->setNewChangesetID($this->rightSideChangesetID)
->setOldAttachesToNewFile($this->leftSideAttachesToNewFile)
->setNewAttachesToNewFile($this->rightSideAttachesToNewFile)
->setCodeCoverage($this->getCoverage())
->setRenderingReference($this->getRenderingReference())
->setMarkupEngine($this->markupEngine)
->setHandles($this->handles);
if ($this->user) {
$renderer->setUser($this->user);
}
$shield = null;
if ($this->isTopLevel && !$this->comments) {
if ($this->isGenerated()) {
$shield = $renderer->renderShield(
pht(
'This file contains generated code, which does not normally '.
'need to be reviewed.'),
true);
} else if ($this->isUnchanged()) {
if ($this->isWhitespaceOnly()) {
$shield = $renderer->renderShield(
pht(
'This file was changed only by adding or removing trailing '.
'whitespace.'),
false);
} else {
$shield = $renderer->renderShield(
pht("The contents of this file were not changed."),
false);
}
} else if ($this->isDeleted()) {
$shield = $renderer->renderShield(
pht("This file was completely deleted."),
true);
} else if ($this->changeset->getAffectedLineCount() > 2500) {
$lines = number_format($this->changeset->getAffectedLineCount());
$shield = $renderer->renderShield(
pht(
'This file has a very large number of changes ({%s} lines).',
$lines),
true);
}
}
if ($shield) {
return $renderer->renderChangesetTable($shield);
}
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$old_comments = array();
$new_comments = array();
$old_mask = array();
$new_mask = array();
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$feedback_mask = array();
if ($this->comments) {
foreach ($this->comments as $comment) {
$start = max($comment->getLineNumber() - self::LINES_CONTEXT, 0);
$end = $comment->getLineNumber() +
$comment->getLineLength() +
self::LINES_CONTEXT;
$new_side = $this->isCommentOnRightSideWhenDisplayed($comment);
for ($ii = $start; $ii <= $end; $ii++) {
if ($new_side) {
$new_mask[$ii] = true;
} else {
$old_mask[$ii] = true;
}
}
}
foreach ($this->old as $ii => $old) {
if (isset($old['line']) && isset($old_mask[$old['line']])) {
$feedback_mask[$ii] = true;
}
}
foreach ($this->new as $ii => $new) {
if (isset($new['line']) && isset($new_mask[$new['line']])) {
$feedback_mask[$ii] = true;
}
}
$this->comments = msort($this->comments, 'getID');
foreach ($this->comments as $comment) {
$final = $comment->getLineNumber() +
$comment->getLineLength();
$final = max(1, $final);
if ($this->isCommentOnRightSideWhenDisplayed($comment)) {
$new_comments[$final][] = $comment;
} else {
$old_comments[$final][] = $comment;
}
}
}
$renderer
->setOldComments($old_comments)
->setNewComments($new_comments);
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switch ($this->changeset->getFileType()) {
case DifferentialChangeType::FILE_IMAGE:
$old = null;
$new = null;
// TODO: Improve the architectural issue as discussed in D955
// https://secure.phabricator.com/D955
$reference = $this->getRenderingReference();
$parts = explode('/', $reference);
if (count($parts) == 2) {
list($id, $vs) = $parts;
} else {
$id = $parts[0];
$vs = 0;
}
$id = (int)$id;
$vs = (int)$vs;
if (!$vs) {
$metadata = $this->changeset->getMetadata();
$data = idx($metadata, 'attachment-data');
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$old_phid = idx($metadata, 'old:binary-phid');
$new_phid = idx($metadata, 'new:binary-phid');
} else {
$vs_changeset = id(new DifferentialChangeset())->load($vs);
$vs_metadata = $vs_changeset->getMetadata();
$old_phid = idx($vs_metadata, 'new:binary-phid');
$changeset = id(new DifferentialChangeset())->load($id);
$metadata = $changeset->getMetadata();
$new_phid = idx($metadata, 'new:binary-phid');
}
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if ($old_phid || $new_phid) {
// grab the files, (micro) optimization for 1 query not 2
$file_phids = array();
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if ($old_phid) {
$file_phids[] = $old_phid;
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}
if ($new_phid) {
$file_phids[] = $new_phid;
}
$files = id(new PhabricatorFile())->loadAllWhere(
'phid IN (%Ls)',
$file_phids);
foreach ($files as $file) {
if (empty($file)) {
continue;
}
if ($file->getPHID() == $old_phid) {
$old = $file;
} else if ($file->getPHID() == $new_phid) {
$new = $file;
}
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}
}
return $renderer->renderFileChange($old, $new, $id, $vs);
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case DifferentialChangeType::FILE_DIRECTORY:
case DifferentialChangeType::FILE_BINARY:
$output = $renderer->renderChangesetTable(null);
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return $output;
}
if ($this->originalLeft && $this->originalRight) {
list($highlight_old, $highlight_new) = $this->diffOriginals();
$highlight_old = array_flip($highlight_old);
$highlight_new = array_flip($highlight_new);
$renderer
->setHighlightOld($highlight_old)
->setHighlightNew($highlight_new);
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}
$renderer
->setOriginalOld($this->originalLeft)
->setOriginalNew($this->originalRight);
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if ($range_start === null) {
$range_start = 0;
}
if ($range_len === null) {
$range_len = $rows;
}
$range_len = min($range_len, $rows - $range_start);
list($gaps, $mask, $depths) = $this->calculateGapsMaskAndDepths(
$mask_force,
$feedback_mask,
$range_start,
$range_len
);
$renderer
->setOldLines($this->old)
->setNewLines($this->new)
->setGaps($gaps)
->setMask($mask)
->setDepths($depths);
$html = $renderer->renderTextChange(
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$range_start,
$range_len,
$rows
);
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return $renderer->renderChangesetTable($html);
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}
/**
* This function calculates a lot of stuff we need to know to display
* the diff:
*
* Gaps - compute gaps in the visible display diff, where we will render
* "Show more context" spacers. If a gap is smaller than the context size,
* we just display it. Otherwise, we record it into $gaps and will render a
* "show more context" element instead of diff text below. A given $gap
* is a tuple of $gap_line_number_start and $gap_length.
*
* Mask - compute the actual lines that need to be shown (because they
* are near changes lines, near inline comments, or the request has
* explicitly asked for them, i.e. resulting from the user clicking
* "show more"). The $mask returned is a sparesely populated dictionary
* of $visible_line_number => true.
*
* Depths - compute how indented any given line is. The $depths returned
* is a sparesely populated dictionary of $visible_line_number => $depth.
*
* This function also has the side effect of modifying member variable
* new such that tabs are normalized to spaces for each line of the diff.
*
* @return array($gaps, $mask, $depths)
*/
private function calculateGapsMaskAndDepths($mask_force,
$feedback_mask,
$range_start,
$range_len) {
// Calculate gaps and mask first
$gaps = array();
$gap_start = 0;
$in_gap = false;
$base_mask = $this->visible + $mask_force + $feedback_mask;
$base_mask[$range_start + $range_len] = true;
for ($ii = $range_start; $ii <= $range_start + $range_len; $ii++) {
if (isset($base_mask[$ii])) {
if ($in_gap) {
$gap_length = $ii - $gap_start;
if ($gap_length <= self::LINES_CONTEXT) {
for ($jj = $gap_start; $jj <= $gap_start + $gap_length; $jj++) {
$base_mask[$jj] = true;
}
} else {
$gaps[] = array($gap_start, $gap_length);
}
$in_gap = false;
}
} else {
if (!$in_gap) {
$gap_start = $ii;
$in_gap = true;
}
}
}
$gaps = array_reverse($gaps);
$mask = $base_mask;
// Time to calculate depth.
// We need to go backwards to properly indent whitespace in this code:
//
// 0: class C {
// 1:
// 1: function f() {
// 2:
// 2: return;
// 3:
// 3: }
// 4:
// 4: }
//
$depths = array();
$last_depth = 0;
$range_end = $range_start + $range_len;
if (!isset($this->new[$range_end])) {
$range_end--;
}
for ($ii = $range_end; $ii >= $range_start; $ii--) {
// We need to expand tabs to process mixed indenting and to round
// correctly later.
$line = str_replace("\t", " ", $this->new[$ii]['text']);
$trimmed = ltrim($line);
if ($trimmed != '') {
// We round down to flatten "/**" and " *".
$last_depth = floor((strlen($line) - strlen($trimmed)) / 2);
}
$depths[$ii] = $last_depth;
}
return array($gaps, $mask, $depths);
}
/**
* Determine if an inline comment will appear on the rendered diff,
* taking into consideration which halves of which changesets will actually
* be shown.
*
* @param PhabricatorInlineCommentInterface Comment to test for visibility.
* @return bool True if the comment is visible on the rendered diff.
*/
private function isCommentVisibleOnRenderedDiff(
PhabricatorInlineCommentInterface $comment) {
$changeset_id = $comment->getChangesetID();
$is_new = $comment->getIsNewFile();
if ($changeset_id == $this->rightSideChangesetID &&
$is_new == $this->rightSideAttachesToNewFile) {
return true;
}
if ($changeset_id == $this->leftSideChangesetID &&
$is_new == $this->leftSideAttachesToNewFile) {
return true;
}
return false;
}
/**
* Determine if a comment will appear on the right side of the display diff.
* Note that the comment must appear somewhere on the rendered changeset, as
* per isCommentVisibleOnRenderedDiff().
*
* @param PhabricatorInlineCommentInterface Comment to test for display
* location.
* @return bool True for right, false for left.
*/
private function isCommentOnRightSideWhenDisplayed(
PhabricatorInlineCommentInterface $comment) {
if (!$this->isCommentVisibleOnRenderedDiff($comment)) {
throw new Exception("Comment is not visible on changeset!");
}
$changeset_id = $comment->getChangesetID();
$is_new = $comment->getIsNewFile();
if ($changeset_id == $this->rightSideChangesetID &&
$is_new == $this->rightSideAttachesToNewFile) {
return true;
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}
return false;
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}
/**
* Parse the 'range' specification that this class and the client-side JS
* emit to indicate that a user clicked "Show more..." on a diff. Generally,
* use is something like this:
*
* $spec = $request->getStr('range');
* $parsed = DifferentialChangesetParser::parseRangeSpecification($spec);
* list($start, $end, $mask) = $parsed;
* $parser->render($start, $end, $mask);
*
* @param string Range specification, indicating the range of the diff that
* should be rendered.
* @return tuple List of <start, end, mask> suitable for passing to
* @{method:render}.
*/
public static function parseRangeSpecification($spec) {
$range_s = null;
$range_e = null;
$mask = array();
if ($spec) {
$match = null;
if (preg_match('@^(\d+)-(\d+)(?:/(\d+)-(\d+))?$@', $spec, $match)) {
$range_s = (int)$match[1];
$range_e = (int)$match[2];
if (count($match) > 3) {
$start = (int)$match[3];
$len = (int)$match[4];
for ($ii = $start; $ii < $start + $len; $ii++) {
$mask[$ii] = true;
}
}
}
}
return array($range_s, $range_e, $mask);
}
/**
* Render "modified coverage" information; test coverage on modified lines.
* This synthesizes diff information with unit test information into a useful
* indicator of how well tested a change is.
*/
public function renderModifiedCoverage() {
$na = '<em>-</em>';
$coverage = $this->getCoverage();
if (!$coverage) {
return $na;
}
$covered = 0;
$not_covered = 0;
foreach ($this->new as $k => $new) {
if (!$new['line']) {
continue;
}
if (!$new['type']) {
continue;
}
if (empty($coverage[$new['line'] - 1])) {
continue;
}
switch ($coverage[$new['line'] - 1]) {
case 'C':
$covered++;
break;
case 'U':
$not_covered++;
break;
}
}
if (!$covered && !$not_covered) {
return $na;
}
return sprintf('%d%%', 100 * ($covered / ($covered + $not_covered)));
}
public function detectCopiedCode(
array $changesets,
$min_width = 30,
$min_lines = 3) {
assert_instances_of($changesets, 'DifferentialChangeset');
$map = array();
$files = array();
$types = array();
foreach ($changesets as $changeset) {
$file = $changeset->getFilename();
foreach ($changeset->getHunks() as $hunk) {
$line = $hunk->getOldOffset();
foreach (explode("\n", $hunk->getChanges()) as $code) {
$type = (isset($code[0]) ? $code[0] : '');
if ($type == '-' || $type == ' ') {
$code = trim(substr($code, 1));
$files[$file][$line] = $code;
$types[$file][$line] = $type;
if (strlen($code) >= $min_width) {
$map[$code][] = array($file, $line);
}
$line++;
}
}
}
}
foreach ($changesets as $changeset) {
$copies = array();
foreach ($changeset->getHunks() as $hunk) {
$added = array_map('trim', $hunk->getAddedLines());
for (reset($added); list($line, $code) = each($added); ) {
if (isset($map[$code])) { // We found a long matching line.
$best_length = 0;
foreach ($map[$code] as $val) { // Explore all candidates.
list($file, $orig_line) = $val;
$length = 1;
// Search also backwards for short lines.
foreach (array(-1, 1) as $direction) {
$offset = $direction;
while (!isset($copies[$line + $offset]) &&
isset($added[$line + $offset]) &&
idx($files[$file], $orig_line + $offset) ===
$added[$line + $offset]) {
$length++;
$offset += $direction;
}
}
if ($length > $best_length ||
($length == $best_length && // Prefer moves.
idx($types[$file], $orig_line) == '-')) {
$best_length = $length;
// ($offset - 1) contains number of forward matching lines.
$best_offset = $offset - 1;
$best_file = $file;
$best_line = $orig_line;
}
}
$file = ($best_file == $changeset->getFilename() ? '' : $best_file);
for ($i = $best_length; $i--; ) {
$type = idx($types[$best_file], $best_line + $best_offset - $i);
$copies[$line + $best_offset - $i] = ($best_length < $min_lines
? array() // Ignore short blocks.
: array($file, $best_line + $best_offset - $i, $type));
}
for ($i = 0; $i < $best_offset; $i++) {
next($added);
}
}
}
}
$copies = array_filter($copies);
if ($copies) {
$metadata = $changeset->getMetadata();
$metadata['copy:lines'] = $copies;
$changeset->setMetadata($metadata);
}
}
return $changesets;
}
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}