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DifferentialChangesetParser.php
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DifferentialChangesetParser.php
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			<?php

			final class DifferentialChangesetParser extends Phobject {

			const HIGHLIGHT_BYTE_LIMIT = 262144;

			protected $visible = array();
			protected $new = array();
			protected $old = array();
			protected $intra = array();
			protected $newRender = null;
			protected $oldRender = null;

			protected $filename = null;
			protected $hunkStartLines = array();

			protected $comments = array();
			protected $specialAttributes = array();

			protected $changeset;
			protected $whitespaceMode = null;

			protected $renderCacheKey = null;

			private $handles = array();
			private $user;

			private $leftSideChangesetID;
			private $leftSideAttachesToNewFile;

			private $rightSideChangesetID;
			private $rightSideAttachesToNewFile;

			private $originalLeft;
			private $originalRight;

			private $renderingReference;
			private $isSubparser;

			private $isTopLevel;

			private $coverage;
			private $markupEngine;
			private $highlightErrors;
			private $disableCache;
			private $renderer;
			private $characterEncoding;
			private $highlightAs;
			private $highlightingDisabled;
			private $showEditAndReplyLinks = true;
			private $canMarkDone;
			private $objectOwnerPHID;
			private $offsetMode;

			private $rangeStart;
			private $rangeEnd;
			private $mask;
			private $linesOfContext = 8;

			private $highlightEngine;

			public function setRange($start, $end) {
			$this->rangeStart = $start;
			$this->rangeEnd = $end;
			return $this;
			}

			public function setMask(array $mask) {
			$this->mask = $mask;
			return $this;
			}

			public function renderChangeset() {
			return $this->render($this->rangeStart, $this->rangeEnd, $this->mask);
			}

			public function setShowEditAndReplyLinks($bool) {
			$this->showEditAndReplyLinks = $bool;
			return $this;
			}

			public function getShowEditAndReplyLinks() {
			return $this->showEditAndReplyLinks;
			}

			public function setHighlightAs($highlight_as) {
			$this->highlightAs = $highlight_as;
			return $this;
			}

			public function getHighlightAs() {
			return $this->highlightAs;
			}

			public function setCharacterEncoding($character_encoding) {
			$this->characterEncoding = $character_encoding;
			return $this;
			}

			public function getCharacterEncoding() {
			return $this->characterEncoding;
			}

			public function setRenderer(DifferentialChangesetRenderer $renderer) {
			$this->renderer = $renderer;
			return $this;
			}

			public function getRenderer() {
			if (!$this->renderer) {
			return new DifferentialChangesetTwoUpRenderer();
			}
			return $this->renderer;
			}

			public function setDisableCache($disable_cache) {
			$this->disableCache = $disable_cache;
			return $this;
			}

			public function getDisableCache() {
			return $this->disableCache;
			}

			public function setCanMarkDone($can_mark_done) {
			$this->canMarkDone = $can_mark_done;
			return $this;
			}

			public function getCanMarkDone() {
			return $this->canMarkDone;
			}

			public function setObjectOwnerPHID($phid) {
			$this->objectOwnerPHID = $phid;
			return $this;
			}

			public function getObjectOwnerPHID() {
			return $this->objectOwnerPHID;
			}

			public function setOffsetMode($offset_mode) {
			$this->offsetMode = $offset_mode;
			return $this;
			}

			public function getOffsetMode() {
			return $this->offsetMode;
			}

			public static function getDefaultRendererForViewer(PhabricatorUser $viewer) {
			$is_unified = $viewer->compareUserSetting(
			PhabricatorUnifiedDiffsSetting::SETTINGKEY,
			PhabricatorUnifiedDiffsSetting::VALUE_ALWAYS_UNIFIED);

			if ($is_unified) {
			return '1up';
			}

			return null;
			}

			public function readParametersFromRequest(AphrontRequest $request) {
			$this->setWhitespaceMode($request->getStr('whitespace'));
			$this->setCharacterEncoding($request->getStr('encoding'));
			$this->setHighlightAs($request->getStr('highlight'));

			$renderer = null;

			// If the viewer prefers unified diffs, always set the renderer to unified.
			// Otherwise, we leave it unspecified and the client will choose a
			// renderer based on the screen size.

			if ($request->getStr('renderer')) {
			$renderer = $request->getStr('renderer');
			} else {
			$renderer = self::getDefaultRendererForViewer($request->getViewer());
			}

			switch ($renderer) {
			case '1up':
			$this->setRenderer(new DifferentialChangesetOneUpRenderer());
			break;
			default:
			$this->setRenderer(new DifferentialChangesetTwoUpRenderer());
			break;
			}

			return $this;
			}

			const CACHE_VERSION = 11;
			const CACHE_MAX_SIZE = 8e6;

			const ATTR_GENERATED = 'attr:generated';
			const ATTR_DELETED = 'attr:deleted';
			const ATTR_UNCHANGED = 'attr:unchanged';
			const ATTR_WHITELINES = 'attr:white';
			const ATTR_MOVEAWAY = 'attr:moveaway';

			const WHITESPACE_SHOW_ALL = 'show-all';
			const WHITESPACE_IGNORE_TRAILING = 'ignore-trailing';
			const WHITESPACE_IGNORE_MOST = 'ignore-most';
			const WHITESPACE_IGNORE_ALL = 'ignore-all';

			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 setIntraLineDiffs(array $diffs) {
			$this->intra = $diffs;
			return $this;
			}

			public function setVisibileLinesMask(array $mask) {
			$this->visible = $mask;
			return $this;
			}

			public function setLinesOfContext($lines_of_context) {
			$this->linesOfContext = $lines_of_context;
			return $this;
			}

			public function getLinesOfContext() {
			return $this->linesOfContext;
			}


			/**
			* 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
			*/
			public function setRightSideCommentMapping($id, $is_new) {
			$this->rightSideChangesetID = $id;
			$this->rightSideAttachesToNewFile = $is_new;
			return $this;
			}

			/**
			* See setRightSideCommentMapping(), but this sets information for the left
			* side of the display diff.
			*/
			public function setLeftSideCommentMapping($id, $is_new) {
			$this->leftSideChangesetID = $id;
			$this->leftSideAttachesToNewFile = $is_new;
			return $this;
			}

			public function setOriginals(
			DifferentialChangeset $left,
			DifferentialChangeset $right) {

			$this->originalLeft = $left;
			$this->originalRight = $right;
			return $this;
			}

			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) {
			$this->changeset = $changeset;

			$this->setFilename($changeset->getFilename());

			return $this;
			}

			public function setWhitespaceMode($whitespace_mode) {
			$this->whitespaceMode = $whitespace_mode;
			return $this;
			}

			public function setRenderingReference($ref) {
			$this->renderingReference = $ref;
			return $this;
			}

			private function getRenderingReference() {
			return $this->renderingReference;
			}

			public function getChangeset() {
			return $this->changeset;
			}

			public function setFilename($filename) {
			$this->filename = $filename;
			return $this;
			}

			public function setHandles(array $handles) {
			assert_instances_of($handles, 'PhabricatorObjectHandle');
			$this->handles = $handles;
			return $this;
			}

			public function setMarkupEngine(PhabricatorMarkupEngine $engine) {
			$this->markupEngine = $engine;
			return $this;
			}

			public function setUser(PhabricatorUser $user) {
			$this->user = $user;
			return $this;
			}

			public function getUser() {
			return $this->user;
			}

			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;
			}
			return $this;
			}

			private function loadCache() {
			$render_cache_key = $this->getRenderCacheKey();
			if (!$render_cache_key) {
			return false;
			}

			$data = null;

			$changeset = new DifferentialChangeset();
			$conn_r = $changeset->establishConnection('r');
			$data = queryfx_one(
			$conn_r,
			'SELECT * FROM %T WHERE id = %d',
			$changeset->getTableName().'_parse_cache',
			$render_cache_key);

			if (!$data) {
			return false;
			}

			if ($data['cache'][0] == '{') {
			// This is likely an old-style JSON cache which we will not be able to
			// deserialize.
			return false;
			}

			$data = unserialize($data['cache']);
			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;
			}

			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',
			'hunkStartLines',
			'cacheVersion',
			'cacheHost',
			'highlightingDisabled',
			);
			}

			public function saveCache() {
			if (PhabricatorEnv::isReadOnly()) {
			return false;
			}

			if ($this->highlightErrors) {
			return false;
			}

			$render_cache_key = $this->getRenderCacheKey();
			if (!$render_cache_key) {
			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;
			}
			}
			$cache = serialize($cache);

			// We don't want to waste too much space by a single changeset.
			if (strlen($cache) > self::CACHE_MAX_SIZE) {
			return;
			}

			$changeset = new DifferentialChangeset();
			$conn_w = $changeset->establishConnection('w');

			$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
			try {
			queryfx(
			$conn_w,
			'INSERT INTO %T (id, cache, dateCreated) VALUES (%d, %B, %d)
			ON DUPLICATE KEY UPDATE cache = VALUES(cache)',
			DifferentialChangeset::TABLE_CACHE,
			$render_cache_key,
			$cache,
			time());
			} catch (AphrontQueryException $ex) {
			// Ignore these exceptions. A common cause is that the cache is
			// larger than 'max_allowed_packet', in which case we're better off
			// not writing it.

			// TODO: It would be nice to tailor this more narrowly.
			}
			unset($unguarded);
			}

			private function markGenerated($new_corpus_block = '') {
			$generated_guess = (strpos($new_corpus_block, '@'.'generated') !== false);

			if (!$generated_guess) {
			$generated_path_regexps = PhabricatorEnv::getEnvConfig(
			'differential.generated-paths');
			foreach ($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;
			}

			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);
			}

			public function isMoveAway() {
			return idx($this->specialAttributes, self::ATTR_MOVEAWAY, false);
			}

			private function applyIntraline(&$render, $intra, $corpus) {

			foreach ($render as $key => $text) {
			if (isset($intra[$key])) {
			$render[$key] = ArcanistDiffUtils::applyIntralineDiff(
			$text,
			$intra[$key]);
			}
			}
			}

			private function getHighlightFuture($corpus) {
			$language = $this->highlightAs;

			if (!$language) {
			$language = $this->highlightEngine->getLanguageFromFilename(
			$this->filename);

			if (($language != 'txt') &&
			(strlen($corpus) > self::HIGHLIGHT_BYTE_LIMIT)) {
			$this->highlightingDisabled = true;
			$language = 'txt';
			}
			}

			return $this->highlightEngine->getHighlightFuture(
			$language,
			$corpus);
			}

			protected function processHighlightedSource($data, $result) {

			$result_lines = phutil_split_lines($result);
			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_ALL:
			break;
			default:
			$whitespace_mode = self::WHITESPACE_IGNORE_MOST;
			break;
			}

			$skip_cache = ($whitespace_mode != self::WHITESPACE_IGNORE_MOST);
			if ($this->disableCache) {
			$skip_cache = true;
			}

			if ($this->characterEncoding) {
			$skip_cache = true;
			}

			if ($this->highlightAs) {
			$skip_cache = true;
			}

			$this->whitespaceMode = $whitespace_mode;

			$changeset = $this->changeset;

			if ($changeset->getFileType() != DifferentialChangeType::FILE_TEXT &&
			$changeset->getFileType() != DifferentialChangeType::FILE_SYMLINK) {

			$this->markGenerated();

			} else {
			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_MOST) \|\|
			($whitespace_mode == self::WHITESPACE_IGNORE_ALL));

			$force_ignore = ($whitespace_mode == self::WHITESPACE_IGNORE_ALL);

			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;
			}
			}

			$hunk_parser = new DifferentialHunkParser();
			$hunk_parser->setWhitespaceMode($whitespace_mode);
			$hunk_parser->parseHunksForLineData($changeset->getHunks());

			// Depending on the whitespace mode, we may need to compute a different
			// set of changes than the set of changes in the hunk data (specificaly,
			// we might want to consider changed lines which have only whitespace
			// changes as unchanged).
			if ($ignore_all) {
			$engine = new PhabricatorDifferenceEngine();
			$engine->setIgnoreWhitespace(true);
			$no_whitespace_changeset = $engine->generateChangesetFromFileContent(
			$old_file,
			$new_file);

			$type_parser = new DifferentialHunkParser();
			$type_parser->parseHunksForLineData($no_whitespace_changeset->getHunks());

			$hunk_parser->setOldLineTypeMap($type_parser->getOldLineTypeMap());
			$hunk_parser->setNewLineTypeMap($type_parser->getNewLineTypeMap());
			}

			$hunk_parser->reparseHunksForSpecialAttributes();

			$unchanged = false;
			if (!$hunk_parser->getHasAnyChanges()) {
			$filetype = $this->changeset->getFileType();
			if ($filetype == DifferentialChangeType::FILE_TEXT \|\|
			$filetype == DifferentialChangeType::FILE_SYMLINK) {
			$unchanged = true;
			}
			}

			$moveaway = false;
			$changetype = $this->changeset->getChangeType();
			if ($changetype == DifferentialChangeType::TYPE_MOVE_AWAY) {
			$moveaway = true;
			}

			$this->setSpecialAttributes(array(
			self::ATTR_UNCHANGED => $unchanged,
			self::ATTR_DELETED => $hunk_parser->getIsDeleted(),
			self::ATTR_WHITELINES => !$hunk_parser->getHasTextChanges(),
			self::ATTR_MOVEAWAY => $moveaway,
			));

			$lines_context = $this->getLinesOfContext();

			$hunk_parser->generateIntraLineDiffs();
			$hunk_parser->generateVisibileLinesMask($lines_context);

			$this->setOldLines($hunk_parser->getOldLines());
			$this->setNewLines($hunk_parser->getNewLines());
			$this->setIntraLineDiffs($hunk_parser->getIntraLineDiffs());
			$this->setVisibileLinesMask($hunk_parser->getVisibleLinesMask());
			$this->hunkStartLines = $hunk_parser->getHunkStartLines(
			$changeset->getHunks());

			$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,
			);

			$this->highlightErrors = false;
			foreach (new FutureIterator($futures) as $key => $future) {
			try {
			try {
			$highlighted = $future->resolve();
			} catch (PhutilSyntaxHighlighterException $ex) {
			$this->highlightErrors = true;
			$highlighted = id(new PhutilDefaultSyntaxHighlighter())
			->getHighlightFuture($corpus_blocks[$key])
			->resolve();
			}
			switch ($key) {
			case 'old':
			$this->oldRender = $this->processHighlightedSource(
			$this->old,
			$highlighted);
			break;
			case 'new':
			$this->newRender = $this->processHighlightedSource(
			$this->new,
			$highlighted);
			break;
			}
			} catch (Exception $ex) {
			phlog($ex);
			throw $ex;
			}
			}

			$this->applyIntraline(
			$this->oldRender,
			ipull($this->intra, 0),
			$old_corpus);
			$this->applyIntraline(
			$this->newRender,
			ipull($this->intra, 1),
			$new_corpus);
			}

			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;
			}

			return true;
			}

			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();

			$encoding = null;
			if ($this->characterEncoding) {
			// We are forcing this changeset to be interpreted with a specific
			// character encoding, so force all the hunks into that encoding and
			// propagate it to the renderer.
			$encoding = $this->characterEncoding;
			foreach ($this->changeset->getHunks() as $hunk) {
			$hunk->forceEncoding($this->characterEncoding);
			}
			} else {
			// We're just using the default, so tell the renderer what that is
			// (by reading the encoding from the first hunk).
			foreach ($this->changeset->getHunks() as $hunk) {
			$encoding = $hunk->getDataEncoding();
			break;
			}
			}

			$this->tryCacheStuff();

			// If we're rendering in an offset mode, treat the range numbers as line
			// numbers instead of rendering offsets.
			$offset_mode = $this->getOffsetMode();
			if ($offset_mode) {
			if ($offset_mode == 'new') {
			$offset_map = $this->new;
			} else {
			$offset_map = $this->old;
			}

			$range_end = $this->getOffset($offset_map, $range_start + $range_len);
			$range_start = $this->getOffset($offset_map, $range_start);
			$range_len = ($range_end - $range_start);
			}

			$render_pch = $this->shouldRenderPropertyChangeHeader($this->changeset);

			$rows = max(
			count($this->old),
			count($this->new));

			$renderer = $this->getRenderer()
			->setUser($this->getUser())
			->setChangeset($this->changeset)
			->setRenderPropertyChangeHeader($render_pch)
			->setIsTopLevel($this->isTopLevel)
			->setOldRender($this->oldRender)
			->setNewRender($this->newRender)
			->setHunkStartLines($this->hunkStartLines)
			->setOldChangesetID($this->leftSideChangesetID)
			->setNewChangesetID($this->rightSideChangesetID)
			->setOldAttachesToNewFile($this->leftSideAttachesToNewFile)
			->setNewAttachesToNewFile($this->rightSideAttachesToNewFile)
			->setCodeCoverage($this->getCoverage())
			->setRenderingReference($this->getRenderingReference())
			->setMarkupEngine($this->markupEngine)
			->setHandles($this->handles)
			->setOldLines($this->old)
			->setNewLines($this->new)
			->setOriginalCharacterEncoding($encoding)
			->setShowEditAndReplyLinks($this->getShowEditAndReplyLinks())
			->setCanMarkDone($this->getCanMarkDone())
			->setObjectOwnerPHID($this->getObjectOwnerPHID())
			->setHighlightingDisabled($this->highlightingDisabled);

			$shield = null;
			if ($this->isTopLevel && !$this->comments) {
			if ($this->isGenerated()) {
			$shield = $renderer->renderShield(
			pht(
			'This file contains generated code, which does not normally '.
			'need to be reviewed.'));
			} else if ($this->isMoveAway()) {
			// We put an empty shield on these files. Normally, they do not have
			// any diff content anyway. However, if they come through `arc`, they
			// may have content. We don't want to show it (it's not useful) and
			// we bailed out of fully processing it earlier anyway.

			// We could show a message like "this file was moved", but we show
			// that as a change header anyway, so it would be redundant. Instead,
			// just render an empty shield to skip rendering the diff body.
			$shield = '';
			} else if ($this->isUnchanged()) {
			$type = 'text';
			if (!$rows) {
			// NOTE: Normally, diffs which don't change files do not include
			// file content (for example, if you "chmod +x" a file and then
			// run "git show", the file content is not available). Similarly,
			// if you move a file from A to B without changing it, diffs normally
			// do not show the file content. In some cases `arc` is able to
			// synthetically generate content for these diffs, but for raw diffs
			// we'll never have it so we need to be prepared to not render a link.
			$type = 'none';
			}

			$type_add = DifferentialChangeType::TYPE_ADD;
			if ($this->changeset->getChangeType() == $type_add) {
			// Although the generic message is sort of accurate in a technical
			// sense, this more-tailored message is less confusing.
			$shield = $renderer->renderShield(
			pht('This is an empty file.'),
			$type);
			} else {
			$shield = $renderer->renderShield(
			pht('The contents of this file were not changed.'),
			$type);
			}
			} else if ($this->isWhitespaceOnly()) {
			$shield = $renderer->renderShield(
			pht('This file was changed only by adding or removing whitespace.'),
			'whitespace');
			} else if ($this->isDeleted()) {
			$shield = $renderer->renderShield(
			pht('This file was completely deleted.'));
			} else if ($this->changeset->getAffectedLineCount() > 2500) {
			$shield = $renderer->renderShield(
			pht(
			'This file has a very large number of changes (%s lines).',
			new PhutilNumber($this->changeset->getAffectedLineCount())));
			}
			}

			if ($shield !== null) {
			return $renderer->renderChangesetTable($shield);
			}

			// This request should render the "undershield" headers if it's a top-level
			// request which made it this far (indicating the changeset has no shield)
			// or it's a request with no mask information (indicating it's the request
			// that removes the rendering shield). Possibly, this second class of
			// request might need to be made more explicit.
			$is_undershield = (empty($mask_force) \|\| $this->isTopLevel);
			$renderer->setIsUndershield($is_undershield);

			$old_comments = array();
			$new_comments = array();
			$old_mask = array();
			$new_mask = array();
			$feedback_mask = array();
			$lines_context = $this->getLinesOfContext();

			if ($this->comments) {
			// If there are any comments which appear in sections of the file which
			// we don't have, we're going to move them backwards to the closest
			// earlier line. Two cases where this may happen are:
			//
			// - Porting ghost comments forward into a file which was mostly
			// deleted.
			// - Porting ghost comments forward from a full-context diff to a
			// partial-context diff.

			list($old_backmap, $new_backmap) = $this->buildLineBackmaps();

			foreach ($this->comments as $comment) {
			$new_side = $this->isCommentOnRightSideWhenDisplayed($comment);

			$line = $comment->getLineNumber();
			if ($new_side) {
			$back_line = $new_backmap[$line];
			} else {
			$back_line = $old_backmap[$line];
			}

			if ($back_line != $line) {
			// TODO: This should probably be cleaner, but just be simple and
			// obvious for now.
			$ghost = $comment->getIsGhost();
			if ($ghost) {
			$moved = pht(
			'This comment originally appeared on line %s, but that line '.
			'does not exist in this version of the diff. It has been '.
			'moved backward to the nearest line.',
			new PhutilNumber($line));
			$ghost['reason'] = $ghost['reason']."\n\n".$moved;
			$comment->setIsGhost($ghost);
			}

			$comment->setLineNumber($back_line);
			$comment->setLineLength(0);

			}

			$start = max($comment->getLineNumber() - $lines_context, 0);
			$end = $comment->getLineNumber() +
			$comment->getLineLength() +
			$lines_context;
			for ($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 = $this->reorderAndThreadComments($this->comments);

			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);

			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');

			$old_phid = idx($metadata, 'old:binary-phid');
			$new_phid = idx($metadata, 'new:binary-phid');
			} else {
			$vs_changeset = id(new DifferentialChangeset())->load($vs);
			$old_phid = null;
			$new_phid = null;

			// TODO: This is spooky, see D6851
			if ($vs_changeset) {
			$vs_metadata = $vs_changeset->getMetadata();
			$old_phid = idx($vs_metadata, 'new:binary-phid');
			}

			$changeset = id(new DifferentialChangeset())->load($id);
			if ($changeset) {
			$metadata = $changeset->getMetadata();
			$new_phid = idx($metadata, 'new:binary-phid');
			}
			}

			if ($old_phid \|\| $new_phid) {
			// grab the files, (micro) optimization for 1 query not 2
			$file_phids = array();
			if ($old_phid) {
			$file_phids[] = $old_phid;
			}
			if ($new_phid) {
			$file_phids[] = $new_phid;
			}

			$files = id(new PhabricatorFileQuery())
			->setViewer($this->getUser())
			->withPHIDs($file_phids)
			->execute();
			foreach ($files as $file) {
			if (empty($file)) {
			continue;
			}
			if ($file->getPHID() == $old_phid) {
			$old = $file;
			} else if ($file->getPHID() == $new_phid) {
			$new = $file;
			}
			}
			}

			$renderer->attachOldFile($old);
			$renderer->attachNewFile($new);

			return $renderer->renderFileChange($old, $new, $id, $vs);
			case DifferentialChangeType::FILE_DIRECTORY:
			case DifferentialChangeType::FILE_BINARY:
			$output = $renderer->renderChangesetTable(null);
			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);
			}
			$renderer
			->setOriginalOld($this->originalLeft)
			->setOriginalNew($this->originalRight);

			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);

			$renderer
			->setGaps($gaps)
			->setMask($mask)
			->setDepths($depths);

			$html = $renderer->renderTextChange(
			$range_start,
			$range_len,
			$rows);

			return $renderer->renderChangesetTable($html);
			}

			/**
			* 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) {

			$lines_context = $this->getLinesOfContext();

			// 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 <= $lines_context) {
			for ($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;
			// 1:
			// 1: }
			// 0:
			// 0: }
			//
			$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(pht('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;
			}

			return false;
			}

			/**
			* 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 = phutil_tag('em', array(), '-');

			$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) {
			$lines = $hunk->getStructuredOldFile();
			foreach ($lines as $line => $info) {
			$type = $info['type'];
			if ($type == '\\') {
			continue;
			}
			$types[$file][$line] = $type;

			$text = $info['text'];
			$text = trim($text);
			$files[$file][$line] = $text;

			if (strlen($text) >= $min_width) {
			$map[$text][] = array($file, $line);
			}
			}
			}
			}

			foreach ($changesets as $changeset) {
			$copies = array();
			foreach ($changeset->getHunks() as $hunk) {
			$added = $hunk->getStructuredNewFile();
			$atype = array();

			foreach ($added as $line => $info) {
			$atype[$line] = $info['type'];
			$added[$line] = trim($info['text']);
			}

			$skip_lines = 0;
			foreach ($added as $line => $code) {
			if ($skip_lines) {
			// We're skipping lines that we already processed because we
			// extended a block above them downward to include them.
			$skip_lines--;
			continue;
			}

			if ($atype[$line] !== '+') {
			// This line hasn't been changed in the new file, so don't try
			// to figure out where it came from.
			continue;
			}

			if (empty($map[$code])) {
			// This line was too short to trigger copy/move detection.
			continue;
			}

			if (count($map[$code]) > 16) {
			// If there are a large number of identical lines in this diff,
			// don't try to figure out where this block came from: the analysis
			// is O(N^2), since we need to compare every line against every
			// other line. Even if we arrive at a result, it is unlikely to be
			// meaningful. See T5041.
			continue;
			}

			$best_length = 0;

			// Explore all candidates.
			foreach ($map[$code] as $val) {
			list($file, $orig_line) = $val;
			$length = 1;

			// Search backward and forward to find all of the adjacent lines
			// which match.
			foreach (array(-1, 1) as $direction) {
			$offset = $direction;
			while (true) {
			if (isset($copies[$line + $offset])) {
			// If we run into a block above us which we've already
			// attributed to a move or copy from elsewhere, stop
			// looking.
			break;
			}

			if (!isset($added[$line + $offset])) {
			// If we've run off the beginning or end of the new file,
			// stop looking.
			break;
			}

			if (!isset($files[$file][$orig_line + $offset])) {
			// If we've run off the beginning or end of the original
			// file, we also stop looking.
			break;
			}

			$old = $files[$file][$orig_line + $offset];
			$new = $added[$line + $offset];
			if ($old !== $new) {
			// If the old line doesn't match the new line, stop
			// looking.
			break;
			}

			$length++;
			$offset += $direction;
			}
			}

			if ($length < $best_length) {
			// If we already know of a better source (more matching lines)
			// for this move/copy, stick with that one. We prefer long
			// copies/moves which match a lot of context over short ones.
			continue;
			}

			if ($length == $best_length) {
			if (idx($types[$file], $orig_line) != '-') {
			// If we already know of an equally good source (same number
			// of matching lines) and this isn't a move, stick with the
			// other one. We prefer moves over copies.
			continue;
			}
			}

			$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));
			}

			$skip_lines = $best_offset;
			}
			}

			$copies = array_filter($copies);
			if ($copies) {
			$metadata = $changeset->getMetadata();
			$metadata['copy:lines'] = $copies;
			$changeset->setMetadata($metadata);
			}
			}
			return $changesets;
			}

			/**
			* Build maps from lines comments appear on to actual lines.
			*/
			private function buildLineBackmaps() {
			$old_back = array();
			$new_back = array();
			foreach ($this->old as $ii => $old) {
			$old_back[$old['line']] = $old['line'];
			}
			foreach ($this->new as $ii => $new) {
			$new_back[$new['line']] = $new['line'];
			}

			$max_old_line = 0;
			$max_new_line = 0;
			foreach ($this->comments as $comment) {
			if ($this->isCommentOnRightSideWhenDisplayed($comment)) {
			$max_new_line = max($max_new_line, $comment->getLineNumber());
			} else {
			$max_old_line = max($max_old_line, $comment->getLineNumber());
			}
			}

			$cursor = 1;
			for ($ii = 1; $ii <= $max_old_line; $ii++) {
			if (empty($old_back[$ii])) {
			$old_back[$ii] = $cursor;
			} else {
			$cursor = $old_back[$ii];
			}
			}

			$cursor = 1;
			for ($ii = 1; $ii <= $max_new_line; $ii++) {
			if (empty($new_back[$ii])) {
			$new_back[$ii] = $cursor;
			} else {
			$cursor = $new_back[$ii];
			}
			}

			return array($old_back, $new_back);
			}

			private function reorderAndThreadComments(array $comments) {
			$comments = msort($comments, 'getID');

			// Build an empty map of all the comments we actually have. If a comment
			// is a reply but the parent has gone missing, we don't want it to vanish
			// completely.
			$comment_phids = mpull($comments, 'getPHID');
			$replies = array_fill_keys($comment_phids, array());

			// Now, remove all comments which are replies, leaving only the top-level
			// comments.
			foreach ($comments as $key => $comment) {
			$reply_phid = $comment->getReplyToCommentPHID();
			if (isset($replies[$reply_phid])) {
			$replies[$reply_phid][] = $comment;
			unset($comments[$key]);
			}
			}

			// For each top level comment, add the comment, then add any replies
			// to it. Do this recursively so threads are shown in threaded order.
			$results = array();
			foreach ($comments as $comment) {
			$results[] = $comment;
			$phid = $comment->getPHID();
			$descendants = $this->getInlineReplies($replies, $phid, 1);
			foreach ($descendants as $descendant) {
			$results[] = $descendant;
			}
			}

			// If we have anything left, they were cyclic references. Just dump
			// them in a the end. This should be impossible, but users are very
			// creative.
			foreach ($replies as $phid => $comments) {
			foreach ($comments as $comment) {
			$results[] = $comment;
			}
			}

			return $results;
			}

			private function getInlineReplies(array &$replies, $phid, $depth) {
			$comments = idx($replies, $phid, array());
			unset($replies[$phid]);

			$results = array();
			foreach ($comments as $comment) {
			$results[] = $comment;
			$descendants = $this->getInlineReplies(
			$replies,
			$comment->getPHID(),
			$depth + 1);
			foreach ($descendants as $descendant) {
			$results[] = $descendant;
			}
			}

			return $results;
			}

			private function getOffset(array $map, $line) {
			if (!$map) {
			return null;
			}

			$line = (int)$line;
			foreach ($map as $key => $spec) {
			if ($spec && isset($spec['line'])) {
			if ((int)$spec['line'] >= $line) {
			return $key;
			}
			}
			}

			return $key;
			}

			}

phab/src/applications/differential/parser/DifferentialChangesetParser.php2604c5af55f6production

DifferentialChangesetParser.phpView Options

phab/src/applications/differential/parser/DifferentialChangesetParser.php
2604c5af55f6production

DifferentialChangesetParser.php
View Options