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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 $depthOnlyLines = array();
			protected $newRender = null;
			protected $oldRender = null;

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

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

			protected $changeset;

			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 $highlightingDisabled;
			private $showEditAndReplyLinks = true;
			private $canMarkDone;
			private $objectOwnerPHID;
			private $offsetMode;

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

			private $highlightEngine;
			private $viewer;

			private $viewState;
			private $availableDocumentEngines;

			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 setViewState(PhabricatorChangesetViewState $view_state) {
			$this->viewState = $view_state;
			return $this;
			}

			public function getViewState() {
			return $this->viewState;
			}

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

			public function getRenderer() {
			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 function setViewer(PhabricatorUser $viewer) {
			$this->viewer = $viewer;
			return $this;
			}

			public function getViewer() {
			return $this->viewer;
			}

			private function newRenderer() {
			$viewer = $this->getViewer();
			$viewstate = $this->getViewstate();

			$renderer_key = $viewstate->getRendererKey();

			if ($renderer_key === null) {
			$is_unified = $viewer->compareUserSetting(
			PhabricatorUnifiedDiffsSetting::SETTINGKEY,
			PhabricatorUnifiedDiffsSetting::VALUE_ALWAYS_UNIFIED);

			if ($is_unified) {
			$renderer_key = '1up';
			} else {
			$renderer_key = $viewstate->getDefaultDeviceRendererKey();
			}
			}

			switch ($renderer_key) {
			case '1up':
			$renderer = new DifferentialChangesetOneUpRenderer();
			break;
			default:
			$renderer = new DifferentialChangesetTwoUpRenderer();
			break;
			}

			return $renderer;
			}

			const CACHE_VERSION = 14;
			const CACHE_MAX_SIZE = 8e6;

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

			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 setDepthOnlyLines(array $lines) {
			$this->depthOnlyLines = $lines;
			return $this;
			}

			public function getDepthOnlyLines() {
			return $this->depthOnlyLines;
			}

			public function setVisibleLinesMask(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 $id The Differential Changeset ID that comments added to the
			* right side of the visible diff should be attached to.
			* @param bool $is_new 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.
			*
			* @param string $key 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 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 setCoverage($coverage) {
			$this->coverage = $coverage;
			return $this;
			}
			private function getCoverage() {
			return $this->coverage;
			}

			public function parseInlineComment(
			PhabricatorInlineComment $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(
			$conn_r,
			'SELECT * FROM %T WHERE cacheIndex = %s',
			DifferentialChangeset::TABLE_CACHE,
			PhabricatorHash::digestForIndex($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',
			'depthOnlyLines',
			'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(
			$conn_w,
			'INSERT INTO %T (cacheIndex, cache, dateCreated) VALUES (%s, %B, %d)
			ON DUPLICATE KEY UPDATE cache = VALUES(cache)',
			DifferentialChangeset::TABLE_CACHE,
			PhabricatorHash::digestForIndex($render_cache_key),
			$cache,
			PhabricatorTime::getNow());
			} 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');

			$attribute = $this->changeset->isGeneratedChangeset();
			if ($attribute) {
			$generated = true;
			}

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

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

			foreach ($render as $key => $text) {
			$result = $text;

			if (isset($intra[$key])) {
			$result = PhabricatorDifferenceEngine::applyIntralineDiff(
			$result,
			$intra[$key]);
			}

			$result = $this->adjustRenderedLineForDisplay($result);

			$render[$key] = $result;
			}
			}

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

			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() {
			$changeset = $this->getChangeset();
			if (!$changeset->hasSourceTextBody()) {

			// TODO: This isn't really correct (the change is not "generated"), the
			// intent is just to not render a text body for Subversion directory
			// changes, etc.
			$this->markGenerated();

			return;
			}

			$viewstate = $this->getViewState();

			$skip_cache = false;

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

			$character_encoding = $viewstate->getCharacterEncoding();
			if ($character_encoding !== null) {
			$skip_cache = true;
			}

			$highlight_language = $viewstate->getHighlightLanguage();
			if ($highlight_language !== null) {
			$skip_cache = true;
			}

			if ($skip_cache \|\| !$this->loadCache()) {
			$this->process();
			if (!$skip_cache) {
			$this->saveCache();
			}
			}
			}

			private function process() {
			$changeset = $this->changeset;

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

			$this->realignDiff($changeset, $hunk_parser);

			$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_MOVEAWAY => $moveaway,
			));

			$lines_context = $this->getLinesOfContext();

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

			$this->setOldLines($hunk_parser->getOldLines());
			$this->setNewLines($hunk_parser->getNewLines());
			$this->setIntraLineDiffs($hunk_parser->getIntraLineDiffs());
			$this->setDepthOnlyLines($hunk_parser->getDepthOnlyLines());
			$this->setVisibleLinesMask($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()) {

			$viewer = $this->getViewer();

			$renderer = $this->getRenderer();
			if (!$renderer) {
			$renderer = $this->newRenderer();
			$this->setRenderer($renderer);
			}

			// "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();

			$viewstate = $this->getViewState();

			$encoding = null;

			$character_encoding = $viewstate->getCharacterEncoding();
			if ($character_encoding) {
			// 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 = $character_encoding;
			foreach ($this->changeset->getHunks() as $hunk) {
			$hunk->forceEncoding($character_encoding);
			}
			} 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;
			}

			// NOTE: Inline comments use zero-based lengths. For example, a comment
			// that starts and ends on line 123 has length 0. Rendering considers
			// this range to have length 1. Probably both should agree, but that
			// ship likely sailed long ago. Tweak things here to get the two systems
			// to agree. See PHI985, where this affected mail rendering of inline
			// comments left on the final line of a file.

			$range_end = $this->getOffset($offset_map, $range_start + $range_len);
			$range_start = $this->getOffset($offset_map, $range_start);
			$range_len = ($range_end - $range_start) + 1;
			}

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

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

			$renderer = $this->getRenderer()
			->setUser($this->getViewer())
			->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())
			->setHandles($this->handles)
			->setOldLines($this->old)
			->setNewLines($this->new)
			->setOriginalCharacterEncoding($encoding)
			->setShowEditAndReplyLinks($this->getShowEditAndReplyLinks())
			->setCanMarkDone($this->getCanMarkDone())
			->setObjectOwnerPHID($this->getObjectOwnerPHID())
			->setHighlightingDisabled($this->highlightingDisabled)
			->setDepthOnlyLines($this->getDepthOnlyLines());

			if ($this->markupEngine) {
			$renderer->setMarkupEngine($this->markupEngine);
			}

			list($engine, $old_ref, $new_ref) = $this->newDocumentEngine();
			if ($engine) {
			$engine_blocks = $engine->newEngineBlocks(
			$old_ref,
			$new_ref);
			} else {
			$engine_blocks = null;
			}

			$has_document_engine = ($engine_blocks !== null);

			// Remove empty comments that don't have any unsaved draft data.
			PhabricatorInlineComment::loadAndAttachVersionedDrafts(
			$viewer,
			$this->comments);
			foreach ($this->comments as $key => $comment) {
			if ($comment->isVoidComment($viewer)) {
			unset($this->comments[$key]);
			}
			}

			// See T13515. Sometimes, we collapse file content by default: for
			// example, if the file is marked as containing generated code.

			// If a file has inline comments, that normally means we never collapse
			// it. However, if the viewer has already collapsed all of the inlines,
			// it's fine to collapse the file.

			$expanded_comments = array();
			foreach ($this->comments as $comment) {
			if ($comment->isHidden()) {
			continue;
			}
			$expanded_comments[] = $comment;
			}

			$collapsed_count = (count($this->comments) - count($expanded_comments));

			$shield_raw = null;
			$shield_text = null;
			$shield_type = null;
			if ($this->isTopLevel && !$expanded_comments && !$has_document_engine) {
			if ($this->isGenerated()) {
			$shield_text = pht(
			'This file contains generated code, which does not normally '.
			'need to be reviewed.');
			} else if ($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.
			$shield_raw = '';
			} else if ($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';
			}

			$shield_type = $type;

			$type_add = DifferentialChangeType::TYPE_ADD;
			if ($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_text = pht('This is an empty file.');
			} else {
			$shield_text = pht('The contents of this file were not changed.');
			}
			} else if ($this->isDeleted()) {
			$shield_text = pht('This file was completely deleted.');
			} else if ($this->changeset->getAffectedLineCount() > 2500) {
			$shield_text = pht(
			'This file has a very large number of changes (%s lines).',
			new PhutilNumber($this->changeset->getAffectedLineCount()));
			}
			}

			$shield = null;
			if ($shield_raw !== null) {
			$shield = $shield_raw;
			} else if ($shield_text !== null) {
			if ($shield_type === null) {
			$shield_type = 'default';
			}

			// If we have inlines and the shield would normally show the whole file,
			// downgrade it to show only text around the inlines.
			if ($collapsed_count) {
			if ($shield_type === 'text') {
			$shield_type = 'default';
			}

			$shield_text = array(
			$shield_text,
			' ',
			pht(
			'This file has %d collapsed inline comment(s).',
			new PhutilNumber($collapsed_count)),
			);
			}

			$shield = $renderer->renderShield($shield_text, $shield_type);
			}

			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();

			// See T13524. Lint inlines from Harbormaster may not have a line
			// number.
			if ($line === null) {
			$back_line = null;
			} else if ($new_side) {
			$back_line = idx($new_backmap, $line);
			} else {
			$back_line = idx($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;
			}
			}

			$this->comments = id(new PHUIDiffInlineThreader())
			->reorderAndThreadCommments($this->comments);

			$old_max_display = 1;
			foreach ($this->old as $old) {
			if (isset($old['line'])) {
			$old_max_display = $old['line'];
			}
			}

			$new_max_display = 1;
			foreach ($this->new as $new) {
			if (isset($new['line'])) {
			$new_max_display = $new['line'];
			}
			}

			foreach ($this->comments as $comment) {
			$display_line = $comment->getLineNumber() + $comment->getLineLength();
			$display_line = max(1, $display_line);

			if ($this->isCommentOnRightSideWhenDisplayed($comment)) {
			$display_line = min($new_max_display, $display_line);
			$new_comments[$display_line][] = $comment;
			} else {
			$display_line = min($old_max_display, $display_line);
			$old_comments[$display_line][] = $comment;
			}
			}
			}

			$renderer
			->setOldComments($old_comments)
			->setNewComments($new_comments);

			if ($engine_blocks !== null) {
			$reference = $this->getRenderingReference();
			$parts = explode('/', $reference);
			if (count($parts) == 2) {
			list($id, $vs) = $parts;
			} else {
			$id = $parts[0];
			$vs = 0;
			}

			// If we don't have an explicit "vs" changeset, it's the left side of
			// the "id" changeset.
			if (!$vs) {
			$vs = $id;
			}

			if ($mask_force) {
			$engine_blocks->setRevealedIndexes(array_keys($mask_force));
			}

			if ($range_start !== null \|\| $range_len !== null) {
			$range_min = $range_start;

			if ($range_len === null) {
			$range_max = null;
			} else {
			$range_max = (int)$range_start + (int)$range_len;
			}

			$engine_blocks->setRange($range_min, $range_max);
			}

			$renderer
			->setDocumentEngine($engine)
			->setDocumentEngineBlocks($engine_blocks);

			return $renderer->renderDocumentEngineBlocks(
			$engine_blocks,
			(string)$id,
			(string)$vs);
			}

			// If we've made it here with a type of file we don't know how to render,
			// bail out with a default empty rendering. Normally, we'd expect a
			// document engine to catch these changes before we make it this far.
			switch ($this->changeset->getFileType()) {
			case DifferentialChangeType::FILE_DIRECTORY:
			case DifferentialChangeType::FILE_BINARY:
			case DifferentialChangeType::FILE_IMAGE:
			$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) = $this->calculateGapsAndMask(
			$mask_force,
			$feedback_mask,
			$range_start,
			$range_len);

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

			$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 sparsely populated dictionary
			* of $visible_line_number => true.
			*
			* @return array($gaps, $mask)
			*/
			private function calculateGapsAndMask(
			$mask_force,
			$feedback_mask,
			$range_start,
			$range_len) {

			$lines_context = $this->getLinesOfContext();

			$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;

			return array($gaps, $mask);
			}

			/**
			* Determine if an inline comment will appear on the rendered diff,
			* taking into consideration which halves of which changesets will actually
			* be shown.
			*
			* @param PhabricatorInlineComment $comment Comment to test for visibility.
			* @return bool True if the comment is visible on the rendered diff.
			*/
			private function isCommentVisibleOnRenderedDiff(
			PhabricatorInlineComment $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 PhabricatorInlineComment $comment Comment to test for display
			* location.
			* @return bool True for right, false for left.
			*/
			private function isCommentOnRightSideWhenDisplayed(
			PhabricatorInlineComment $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 $spec Range specification, indicating the range of the diff
			* that should be rendered.
			* @return tuple List of <start, end, mask> suitable for passing to
			* @{method:render}.
			*/
			public static function parseRangeSpecification($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 === null) {
			continue;
			}

			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)));
			}

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

			private function realignDiff(
			DifferentialChangeset $changeset,
			DifferentialHunkParser $hunk_parser) {
			// Normalizing and realigning the diff 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, skip realignment.

			// We have more than one hunk, so we're definitely missing part of the file.
			$hunks = $changeset->getHunks();
			if (count($hunks) !== 1) {
			return null;
			}

			// The first hunk doesn't start at the beginning of the file, so we're
			// missing some context.
			$first_hunk = head($hunks);
			if ($first_hunk->getOldOffset() != 1 \|\| $first_hunk->getNewOffset() != 1) {
			return null;
			}

			$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).
			return null;
			}


			$engine = id(new PhabricatorDifferenceEngine())
			->setNormalize(true);

			$normalized_changeset = $engine->generateChangesetFromFileContent(
			$old_file,
			$new_file);

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

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

			private function adjustRenderedLineForDisplay($line) {
			// IMPORTANT: We're using "str_replace()" against raw HTML here, which can
			// easily become unsafe. The input HTML has already had syntax highlighting
			// and intraline diff highlighting applied, so it's full of "<span />" tags.

			static $search;
			static $replace;
			if ($search === null) {
			$rules = $this->newSuspiciousCharacterRules();

			$map = array();
			foreach ($rules as $key => $spec) {
			$tag = phutil_tag(
			'span',
			array(
			'data-copy-text' => $key,
			'class' => $spec['class'],
			'title' => $spec['title'],
			),
			$spec['replacement']);
			$map[$key] = phutil_string_cast($tag);
			}

			$search = array_keys($map);
			$replace = array_values($map);
			}

			$is_html = false;
			if ($line instanceof PhutilSafeHTML) {
			$is_html = true;
			$line = hsprintf('%s', $line);
			}

			$line = phutil_string_cast($line);

			// TODO: This should be flexible, eventually.
			$tab_width = 2;

			$line = self::replaceTabsWithSpaces($line, $tab_width);
			$line = str_replace($search, $replace, $line);

			if ($is_html) {
			$line = phutil_safe_html($line);
			}

			return $line;
			}

			private function newSuspiciousCharacterRules() {
			// The "title" attributes are cached in the database, so they're
			// intentionally not wrapped in "pht(...)".

			$rules = array(
			"\xE2\x80\x8B" => array(
			'title' => 'ZWS',
			'class' => 'suspicious-character',
			'replacement' => '!',
			),
			"\xC2\xA0" => array(
			'title' => 'NBSP',
			'class' => 'suspicious-character',
			'replacement' => '!',
			),
			"\x7F" => array(
			'title' => 'DEL (0x7F)',
			'class' => 'suspicious-character',
			'replacement' => "\xE2\x90\xA1",
			),
			);

			// Unicode defines special pictures for the control characters in the
			// range between "0x00" and "0x1F".

			$control = array(
			'NULL',
			'SOH',
			'STX',
			'ETX',
			'EOT',
			'ENQ',
			'ACK',
			'BEL',
			'BS',
			null, // "\t" Tab
			null, // "\n" New Line
			'VT',
			'FF',
			null, // "\r" Carriage Return,
			'SO',
			'SI',
			'DLE',
			'DC1',
			'DC2',
			'DC3',
			'DC4',
			'NAK',
			'SYN',
			'ETB',
			'CAN',
			'EM',
			'SUB',
			'ESC',
			'FS',
			'GS',
			'RS',
			'US',
			);

			foreach ($control as $idx => $label) {
			if ($label === null) {
			continue;
			}

			$rules[chr($idx)] = array(
			'title' => sprintf('%s (0x%02X)', $label, $idx),
			'class' => 'suspicious-character',
			'replacement' => "\xE2\x90".chr(0x80 + $idx),
			);
			}

			return $rules;
			}

			public static function replaceTabsWithSpaces($line, $tab_width) {
			static $tags = array();
			if (empty($tags[$tab_width])) {
			for ($ii = 1; $ii <= $tab_width; $ii++) {
			$tag = phutil_tag(
			'span',
			array(
			'data-copy-text' => "\t",
			),
			str_repeat(' ', $ii));
			$tag = phutil_string_cast($tag);
			$tags[$ii] = $tag;
			}
			}

			// Expand all prefix tabs until we encounter any non-tab character. This
			// is cheap and often immediately produces the correct result with no
			// further work (and, particularly, no need to handle any unicode cases).

			$len = strlen($line);

			$head = 0;
			for ($head = 0; $head < $len; $head++) {
			$char = $line[$head];
			if ($char !== "\t") {
			break;
			}
			}

			if ($head) {
			if (empty($tags[$tab_width * $head])) {
			$tags[$tab_width * $head] = str_repeat($tags[$tab_width], $head);
			}
			$prefix = $tags[$tab_width * $head];
			$line = substr($line, $head);
			} else {
			$prefix = '';
			}

			// If we have no remaining tabs elsewhere in the string after taking care
			// of all the prefix tabs, we're done.
			if (strpos($line, "\t") === false) {
			return $prefix.$line;
			}

			$len = strlen($line);

			// If the line is particularly long, don't try to do anything special with
			// it. Use a faster approximation of the correct tabstop expansion instead.
			// This usually still arrives at the right result.
			if ($len > 256) {
			return $prefix.str_replace("\t", $tags[$tab_width], $line);
			}

			$in_tag = false;
			$pos = 0;

			// See PHI1210. If the line only has single-byte characters, we don't need
			// to vectorize it and can avoid an expensive UTF8 call.

			$fast_path = preg_match('/^[\x01-\x7F]*\z/', $line);
			if ($fast_path) {
			$replace = array();
			for ($ii = 0; $ii < $len; $ii++) {
			$char = $line[$ii];
			if ($char === '>') {
			$in_tag = false;
			continue;
			}

			if ($in_tag) {
			continue;
			}

			if ($char === '<') {
			$in_tag = true;
			continue;
			}

			if ($char === "\t") {
			$count = $tab_width - ($pos % $tab_width);
			$pos += $count;
			$replace[$ii] = $tags[$count];
			continue;
			}

			$pos++;
			}

			if ($replace) {
			// Apply replacements starting at the end of the string so they
			// don't mess up the offsets for following replacements.
			$replace = array_reverse($replace, true);

			foreach ($replace as $replace_pos => $replacement) {
			$line = substr_replace($line, $replacement, $replace_pos, 1);
			}
			}
			} else {
			$line = phutil_utf8v_combined($line);
			foreach ($line as $key => $char) {
			if ($char === '>') {
			$in_tag = false;
			continue;
			}

			if ($in_tag) {
			continue;
			}

			if ($char === '<') {
			$in_tag = true;
			continue;
			}

			if ($char === "\t") {
			$count = $tab_width - ($pos % $tab_width);
			$pos += $count;
			$line[$key] = $tags[$count];
			continue;
			}

			$pos++;
			}

			$line = implode('', $line);
			}

			return $prefix.$line;
			}

			private function newDocumentEngine() {
			$changeset = $this->changeset;
			$viewer = $this->getViewer();

			list($old_file, $new_file) = $this->loadFileObjectsForChangeset();

			$no_old = !$changeset->hasOldState();
			$no_new = !$changeset->hasNewState();

			if ($no_old) {
			$old_ref = null;
			} else {
			$old_ref = id(new PhabricatorDocumentRef())
			->setName($changeset->getOldFile());
			if ($old_file) {
			$old_ref->setFile($old_file);
			} else {
			$old_data = $this->getRawDocumentEngineData($this->old);
			$old_ref->setData($old_data);
			}
			}

			if ($no_new) {
			$new_ref = null;
			} else {
			$new_ref = id(new PhabricatorDocumentRef())
			->setName($changeset->getFilename());
			if ($new_file) {
			$new_ref->setFile($new_file);
			} else {
			$new_data = $this->getRawDocumentEngineData($this->new);
			$new_ref->setData($new_data);
			}
			}

			$old_engines = null;
			if ($old_ref) {
			$old_engines = PhabricatorDocumentEngine::getEnginesForRef(
			$viewer,
			$old_ref);
			}

			$new_engines = null;
			if ($new_ref) {
			$new_engines = PhabricatorDocumentEngine::getEnginesForRef(
			$viewer,
			$new_ref);
			}

			if ($new_engines !== null && $old_engines !== null) {
			$shared_engines = array_intersect_key($new_engines, $old_engines);
			$default_engine = head_key($new_engines);
			} else if ($new_engines !== null) {
			$shared_engines = $new_engines;
			$default_engine = head_key($shared_engines);
			} else if ($old_engines !== null) {
			$shared_engines = $old_engines;
			$default_engine = head_key($shared_engines);
			} else {
			return null;
			}

			foreach ($shared_engines as $key => $shared_engine) {
			if (!$shared_engine->canDiffDocuments($old_ref, $new_ref)) {
			unset($shared_engines[$key]);
			}
			}

			$this->availableDocumentEngines = $shared_engines;

			$viewstate = $this->getViewState();

			$engine_key = $viewstate->getDocumentEngineKey();
			if (phutil_nonempty_string($engine_key)) {
			if (isset($shared_engines[$engine_key])) {
			$document_engine = $shared_engines[$engine_key];
			} else {
			$document_engine = null;
			}
			} else {
			// If we aren't rendering with a specific engine, only use a default
			// engine if the best engine for the new file is a shared engine which
			// can diff files. If we're less picky (for example, by accepting any
			// shared engine) we can end up with silly behavior (like ".json" files
			// rendering as Jupyter documents).

			if (isset($shared_engines[$default_engine])) {
			$document_engine = $shared_engines[$default_engine];
			} else {
			$document_engine = null;
			}
			}

			if ($document_engine) {
			return array(
			$document_engine,
			$old_ref,
			$new_ref);
			}

			return null;
			}

			private function loadFileObjectsForChangeset() {
			$changeset = $this->changeset;
			$viewer = $this->getViewer();

			$old_phid = $changeset->getOldFileObjectPHID();
			$new_phid = $changeset->getNewFileObjectPHID();

			$old_file = null;
			$new_file = null;

			if ($old_phid \|\| $new_phid) {
			$file_phids = array();
			if ($old_phid) {
			$file_phids[] = $old_phid;
			}
			if ($new_phid) {
			$file_phids[] = $new_phid;
			}

			$files = id(new PhabricatorFileQuery())
			->setViewer($viewer)
			->withPHIDs($file_phids)
			->execute();
			$files = mpull($files, null, 'getPHID');

			if ($old_phid) {
			$old_file = idx($files, $old_phid);
			if (!$old_file) {
			throw new Exception(
			pht(
			'Failed to load file data for changeset ("%s").',
			$old_phid));
			}
			$changeset->attachOldFileObject($old_file);
			}

			if ($new_phid) {
			$new_file = idx($files, $new_phid);
			if (!$new_file) {
			throw new Exception(
			pht(
			'Failed to load file data for changeset ("%s").',
			$new_phid));
			}
			$changeset->attachNewFileObject($new_file);
			}
			}

			return array($old_file, $new_file);
			}

			public function newChangesetResponse() {
			// NOTE: This has to happen first because it has side effects. Yuck.
			$rendered_changeset = $this->renderChangeset();

			$renderer = $this->getRenderer();
			$renderer_key = $renderer->getRendererKey();

			$viewstate = $this->getViewState();

			$undo_templates = $renderer->renderUndoTemplates();
			foreach ($undo_templates as $key => $undo_template) {
			$undo_templates[$key] = hsprintf('%s', $undo_template);
			}

			$document_engine = $renderer->getDocumentEngine();
			if ($document_engine) {
			$document_engine_key = $document_engine->getDocumentEngineKey();
			} else {
			$document_engine_key = null;
			}

			$available_keys = array();
			$engines = $this->availableDocumentEngines;
			if (!$engines) {
			$engines = array();
			}

			$available_keys = mpull($engines, 'getDocumentEngineKey');

			// TODO: Always include "source" as a usable engine to default to
			// the buitin rendering. This is kind of a hack and does not actually
			// use the source engine. The source engine isn't a diff engine, so
			// selecting it causes us to fall through and render with builtin
			// behavior. For now, overall behavir is reasonable.

			$available_keys[] = PhabricatorSourceDocumentEngine::ENGINEKEY;
			$available_keys = array_fuse($available_keys);
			$available_keys = array_values($available_keys);

			$state = array(
			'undoTemplates' => $undo_templates,
			'rendererKey' => $renderer_key,
			'highlight' => $viewstate->getHighlightLanguage(),
			'characterEncoding' => $viewstate->getCharacterEncoding(),
			'requestDocumentEngineKey' => $viewstate->getDocumentEngineKey(),
			'responseDocumentEngineKey' => $document_engine_key,
			'availableDocumentEngineKeys' => $available_keys,
			'isHidden' => $viewstate->getHidden(),
			);

			return id(new PhabricatorChangesetResponse())
			->setRenderedChangeset($rendered_changeset)
			->setChangesetState($state);
			}

			private function getRawDocumentEngineData(array $lines) {
			$text = array();

			foreach ($lines as $line) {
			if ($line === null) {
			continue;
			}

			// If this is a "No newline at end of file." annotation, don't hand it
			// off to the DocumentEngine.
			if ($line['type'] === '\\') {
			continue;
			}

			$text[] = $line['text'];
			}

			return implode('', $text);
			}

			}

Owner Packages

No Owners

phorge/src/applications/differential/parser/DifferentialChangesetParser.phpe81eff68e581HEAD -> master

DifferentialChangesetParser.phpView Options

Owner Packages

phorge/src/applications/differential/parser/DifferentialChangesetParser.php
e81eff68e581HEAD -> master

DifferentialChangesetParser.php
View Options