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DifferentialChangesetParser.php
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DifferentialChangesetParser.php
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			<?php

			final class DifferentialChangesetParser {

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

			protected $filename = null;
			protected $missingOld = array();
			protected $missingNew = array();

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

			protected $changeset;
			protected $whitespaceMode = null;

			protected $subparser;

			protected $renderCacheKey = null;

			private $handles;
			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;

			const CACHE_VERSION = 8;
			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 LINES_CONTEXT = 8;

			const WHITESPACE_SHOW_ALL = 'show-all';
			const WHITESPACE_IGNORE_TRAILING = 'ignore-trailing';

			// TODO: This is now "Ignore Most" in the UI.
			const WHITESPACE_IGNORE_ALL = 'ignore-all';

			const WHITESPACE_IGNORE_FORCE = 'ignore-force';

			/**
			* 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;
			}

			public function diffOriginals() {
			$engine = new PhabricatorDifferenceEngine();
			$changeset = $engine->generateChangesetFromFileContent(
			implode('', mpull($this->originalLeft->getHunks(), 'getChanges')),
			implode('', mpull($this->originalRight->getHunks(), 'getChanges')));

			// Put changes side by side.
			$olds = array();
			$news = array();
			foreach ($changeset->getHunks() as $hunk) {
			$n_old = $hunk->getOldOffset();
			$n_new = $hunk->getNewOffset();
			$changes = phutil_split_lines($hunk->getChanges());
			foreach ($changes as $line) {
			$diff_type = $line[0]; // Change type in diff of diffs.
			$orig_type = $line[1]; // Change type in the original diff.
			if ($diff_type == ' ') {
			// Use the same key for lines that are next to each other.
			$key = max(last_key($olds), last_key($news)) + 1;
			$olds[$key] = null;
			$news[$key] = null;
			} else if ($diff_type == '-') {
			$olds[] = array($n_old, $orig_type);
			} else if ($diff_type == '+') {
			$news[] = array($n_new, $orig_type);
			}
			if (($diff_type == '-' \|\| $diff_type == ' ') && $orig_type != '-') {
			$n_old++;
			}
			if (($diff_type == '+' \|\| $diff_type == ' ') && $orig_type != '-') {
			$n_new++;
			}
			}
			}

			$offsets_old = $this->originalLeft->computeOffsets();
			$offsets_new = $this->originalRight->computeOffsets();

			// Highlight lines that were added on each side or removed on the other
			// side.
			$highlight_old = array();
			$highlight_new = array();
			$last = max(last_key($olds), last_key($news));
			for ($i = 0; $i <= $last; $i++) {
			if (isset($olds[$i])) {
			list($n, $type) = $olds[$i];
			if ($type == '+' \|\|
			($type == ' ' && isset($news[$i]) && $news[$i][1] != ' ')) {
			$highlight_old[] = $offsets_old[$n];
			}
			}
			if (isset($news[$i])) {
			list($n, $type) = $news[$i];
			if ($type == '+' \|\|
			($type == ' ' && isset($olds[$i]) && $olds[$i][1] != ' ')) {
			$highlight_new[] = $offsets_new[$n];
			}
			}
			}

			return array($highlight_old, $highlight_new);
			}

			/**
			* 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($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;
			}

			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 setCoverage($coverage) {
			$this->coverage = $coverage;
			return $this;
			}

			public function parseHunk(DifferentialHunk $hunk) {
			$lines = $hunk->getChanges();
			$lines = phutil_split_lines($lines);

			$types = array();
			foreach ($lines as $line_index => $line) {
			if (isset($line[0])) {
			$char = $line[0];
			if ($char == ' ') {
			$types[$line_index] = null;
			} else {
			$types[$line_index] = $char;
			}
			} else {
			$types[$line_index] = null;
			}
			}

			$old_line = $hunk->getOldOffset();
			$new_line = $hunk->getNewOffset();
			$num_lines = count($lines);

			if ($old_line > 1) {
			$this->missingOld[$old_line] = true;
			} else if ($new_line > 1) {
			$this->missingNew[$new_line] = true;
			}

			for ($cursor = 0; $cursor < $num_lines; $cursor++) {
			$type = $types[$cursor];
			$data = array(
			'type' => $type,
			'text' => (string)substr($lines[$cursor], 1),
			'line' => $new_line,
			);
			if ($type == '\\') {
			$type = $types[$cursor - 1];
			$data['text'] = ltrim($data['text']);
			}
			switch ($type) {
			case '+':
			$this->new[] = $data;
			++$new_line;
			break;
			case '-':
			$data['line'] = $old_line;
			$this->old[] = $data;
			++$old_line;
			break;
			default:
			$this->new[] = $data;
			$data['line'] = $old_line;
			$this->old[] = $data;
			++$new_line;
			++$old_line;
			break;
			}
			}
			}

			public function parseInlineComment(
			PhabricatorInlineCommentInterface $comment) {

			// Parse only comments which are actually visible.
			if ($this->isCommentVisibleOnRenderedDiff($comment)) {
			$this->comments[] = $comment;
			}
			return $this;
			}

			public function process() {

			$old = array();
			$new = array();

			$this->old = array_reverse($this->old);
			$this->new = array_reverse($this->new);

			$whitelines = false;
			$changed = false;

			$skip_intra = array();
			while (count($this->old) \|\| count($this->new)) {
			$o_desc = array_pop($this->old);
			$n_desc = array_pop($this->new);

			if ($o_desc) {
			$o_type = $o_desc['type'];
			} else {
			$o_type = null;
			}

			if ($n_desc) {
			$n_type = $n_desc['type'];
			} else {
			$n_type = null;
			}

			if (($o_type != null) && ($n_type == null)) {
			$old[] = $o_desc;
			$new[] = null;
			if ($n_desc) {
			array_push($this->new, $n_desc);
			}
			$changed = true;
			continue;
			}

			if (($n_type != null) && ($o_type == null)) {
			$old[] = null;
			$new[] = $n_desc;
			if ($o_desc) {
			array_push($this->old, $o_desc);
			}
			$changed = true;
			continue;
			}

			if ($this->whitespaceMode != self::WHITESPACE_SHOW_ALL) {
			$similar = false;
			switch ($this->whitespaceMode) {
			case self::WHITESPACE_IGNORE_TRAILING:
			if (rtrim($o_desc['text']) == rtrim($n_desc['text'])) {
			if ($o_desc['type']) {
			// If we're converting this into an unchanged line because of
			// a trailing whitespace difference, mark it as a whitespace
			// change so we can show "This file was modified only by
			// adding or removing trailing whitespace." instead of
			// "This file was not modified.".
			$whitelines = true;
			}
			$similar = true;
			}
			break;
			default:
			// In this case, the lines are similar if there is no change type
			// (that is, just trust the diff algorithm).
			if (!$o_desc['type']) {
			$similar = true;
			}
			break;
			}
			if ($similar) {
			if ($o_desc['type'] == '\\') {
			// These are similar because they're "No newline at end of file"
			// comments.
			} else {
			$o_desc['type'] = null;
			$n_desc['type'] = null;
			$skip_intra[count($old)] = true;
			}
			} else {
			$changed = true;
			}
			} else {
			$changed = true;
			}

			$old[] = $o_desc;
			$new[] = $n_desc;
			}

			$this->old = $old;
			$this->new = $new;

			$unchanged = false;
			if ($this->subparser) {
			$unchanged = $this->subparser->isUnchanged();
			$whitelines = $this->subparser->isWhitespaceOnly();
			} else if (!$changed) {
			$filetype = $this->changeset->getFileType();
			if ($filetype == DifferentialChangeType::FILE_TEXT \|\|
			$filetype == DifferentialChangeType::FILE_SYMLINK) {
			$unchanged = true;
			}
			}
			$changetype = $this->changeset->getChangeType();
			if ($changetype == DifferentialChangeType::TYPE_MOVE_AWAY) {
			// sometimes we show moved files as unchanged, sometimes deleted,
			// and sometimes inconsistent with what actually happened at the
			// destination of the move. Rather than make a false claim,
			// omit the 'not changed' notice if this is the source of a move
			$unchanged = false;
			}

			$this->specialAttributes = array(
			self::ATTR_UNCHANGED => $unchanged,
			self::ATTR_DELETED => array_filter($this->old) &&
			!array_filter($this->new),
			self::ATTR_WHITELINES => $whitelines
			);

			if ($this->isSubparser) {
			// The rest of this function deals with formatting the diff for display;
			// we can exit early if we're a subparser and avoid doing extra work.
			return;
			}

			if ($this->subparser) {

			// Use this parser's side-by-side line information -- notably, the
			// change types -- but replace all the line text with the subparser's.
			// This lets us render whitespace-only changes without marking them as
			// different.

			$old = $this->old;
			$new = $this->new;
			$old_text = ipull($this->subparser->old, 'text', 'line');
			$new_text = ipull($this->subparser->new, 'text', 'line');

			foreach ($old as $k => $desc) {
			if (empty($desc)) {
			continue;
			}
			$old[$k]['text'] = idx($old_text, $desc['line']);
			}
			foreach ($new as $k => $desc) {
			if (empty($desc)) {
			continue;
			}
			$new[$k]['text'] = idx($new_text, $desc['line']);

			if ($this->whitespaceMode == self::WHITESPACE_IGNORE_FORCE) {
			// Under forced ignore mode, ignore even internal whitespace
			// changes.
			continue;
			}

			// If there's a corresponding "old" text and the line is marked as
			// unchanged, test if there are internal whitespace changes between
			// non-whitespace characters, e.g. spaces added to a string or spaces
			// added around operators. If we find internal spaces, mark the line
			// as changed.
			//
			// We only need to do this for "new" lines because any line that is
			// missing either "old" or "new" text certainly can not have internal
			// whitespace changes without also having non-whitespace changes,
			// because characters had to be either added or removed to create the
			// possibility of internal whitespace.
			if (isset($old[$k]['text']) && empty($new[$k]['type'])) {
			if (trim($old[$k]['text']) != trim($new[$k]['text'])) {
			// The strings aren't the same when trimmed, so there are internal
			// whitespace changes. Mark this line changed.
			$old[$k]['type'] = '-';
			$new[$k]['type'] = '+';

			// Re-mark this line for intraline diffing.
			unset($skip_intra[$k]);
			}
			}
			}

			$this->old = $old;
			$this->new = $new;
			}

			$min_length = min(count($this->old), count($this->new));
			for ($ii = 0; $ii < $min_length; $ii++) {
			if ($this->old[$ii] \|\| $this->new[$ii]) {
			if (isset($this->old[$ii]['text'])) {
			$otext = $this->old[$ii]['text'];
			} else {
			$otext = '';
			}
			if (isset($this->new[$ii]['text'])) {
			$ntext = $this->new[$ii]['text'];
			} else {
			$ntext = '';
			}
			if ($otext != $ntext && empty($skip_intra[$ii])) {
			$this->intra[$ii] = ArcanistDiffUtils::generateIntralineDiff(
			$otext,
			$ntext);
			}
			}
			}

			$lines_context = self::LINES_CONTEXT;
			$max_length = max(count($this->old), count($this->new));
			$old = $this->old;
			$new = $this->new;
			$visible = false;
			$last = 0;
			for ($cursor = -$lines_context; $cursor < $max_length; $cursor++) {
			$offset = $cursor + $lines_context;
			if ((isset($old[$offset]) && $old[$offset]['type']) \|\|
			(isset($new[$offset]) && $new[$offset]['type'])) {
			$visible = true;
			$last = $offset;
			} else if ($cursor > $last + $lines_context) {
			$visible = false;
			}
			if ($visible && $cursor > 0) {
			$this->visible[$cursor] = 1;
			}
			}

			$old_corpus = array();
			foreach ($this->old as $o) {
			if ($o['type'] != '\\') {
			if ($o['text'] === null) {
			// There's no text on this side of the diff, but insert a placeholder
			// newline so the highlighted line numbers match up.
			$old_corpus[] = "\n";
			} else {
			$old_corpus[] = $o['text'];
			}
			}
			}
			$old_corpus_block = implode('', $old_corpus);

			$new_corpus = array();
			foreach ($this->new as $n) {
			if ($n['type'] != '\\') {
			if ($n['text'] === null) {
			$new_corpus[] = "\n";
			} else {
			$new_corpus[] = $n['text'];
			}
			}
			}
			$new_corpus_block = implode('', $new_corpus);

			$this->markGenerated($new_corpus_block);

			if ($this->isTopLevel && !$this->comments &&
			($this->isGenerated() \|\| $this->isUnchanged() \|\| $this->isDeleted())) {
			return;
			}

			$old_future = $this->getHighlightFuture($old_corpus_block);
			$new_future = $this->getHighlightFuture($new_corpus_block);
			$futures = array(
			'old' => $old_future,
			'new' => $new_future,
			);
			$corpus_blocks = array(
			'old' => $old_corpus_block,
			'new' => $new_corpus_block,
			);

			$this->highlightErrors = false;
			foreach (Futures($futures) as $key => $future) {
			try {
			try {
			$highlighted = $future->resolve();
			} catch (PhutilSyntaxHighlighterException $ex) {
			$this->highlightErrors = true;
			$highlighted = id(new PhutilDefaultSyntaxHighlighter())
			->getHighlightFuture($corpus_blocks[$key])
			->resolve();
			}
			switch ($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);
			}

			public 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;
			}

			$data = json_decode($data['cache'], true);
			if (!is_array($data) \|\| !$data) {
			return false;
			}

			foreach (self::getCacheableProperties() as $cache_key) {
			if (!array_key_exists($cache_key, $data)) {
			// If we're missing a cache key, assume we're looking at an old cache
			// and ignore it.
			return false;
			}
			}

			if ($data['cacheVersion'] !== self::CACHE_VERSION) {
			return false;
			}

			// Someone displays contents of a partially cached shielded file.
			if (!isset($data['newRender']) && (!$this->isTopLevel \|\| $this->comments)) {
			return false;
			}

			unset($data['cacheVersion'], $data['cacheHost']);
			$cache_prop = array_select_keys($data, self::getCacheableProperties());
			foreach ($cache_prop as $cache_key => $v) {
			$this->$cache_key = $v;
			}

			return true;
			}

			protected static function getCacheableProperties() {
			return array(
			'visible',
			'new',
			'old',
			'intra',
			'newRender',
			'oldRender',
			'specialAttributes',
			'missingOld',
			'missingNew',
			'cacheVersion',
			'cacheHost',
			);
			}

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

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

			$cache = array();
			foreach (self::getCacheableProperties() as $cache_key) {
			switch ($cache_key) {
			case 'cacheVersion':
			$cache[$cache_key] = self::CACHE_VERSION;
			break;
			case 'cacheHost':
			$cache[$cache_key] = php_uname('n');
			break;
			default:
			$cache[$cache_key] = $this->$cache_key;
			break;
			}
			}
			$cache = json_encode($cache);

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

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

			$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
			queryfx(
			$conn_w,
			'INSERT INTO %T (id, cache, dateCreated) VALUES (%d, %s, %d)
			ON DUPLICATE KEY UPDATE cache = VALUES(cache)',
			DifferentialChangeset::TABLE_CACHE,
			$render_cache_key,
			$cache,
			time());
			} catch (AphrontQueryException $ex) {
			// TODO: uhoh
			}
			}

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

			if (!$generated_guess) {
			$config_key = 'differential.generated-paths';
			$generated_path_regexps = PhabricatorEnv::getEnvConfig($config_key);
			foreach ($generated_path_regexps as $regexp) {
			if (preg_match($regexp, $this->changeset->getFilename())) {
			$generated_guess = true;
			break;
			}
			}
			}

			$event = new PhabricatorEvent(
			PhabricatorEventType::TYPE_DIFFERENTIAL_WILLMARKGENERATED,
			array(
			'corpus' => $new_corpus_block,
			'is_generated' => $generated_guess,
			)
			);
			PhutilEventEngine::dispatchEvent($event);

			$generated = $event->getValue('is_generated');
			$this->specialAttributes[self::ATTR_GENERATED] = $generated;
			}

			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 getLength() {
			return max(count($this->old), count($this->new));
			}

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

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

			protected function getHighlightFuture($corpus) {
			if (preg_match('/\r(?!\n)/', $corpus)) {
			// TODO: Pygments converts "\r" newlines into "\n" newlines, so we can't
			// use it on files with "\r" newlines. If we have "\r" not followed by
			// "\n" in the file, skip highlighting.
			$result = phutil_escape_html($corpus);
			return new ImmediateFuture($result);
			}

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

			protected function processHighlightedSource($data, $result) {

			$result_lines = phutil_split_lines($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_FORCE:
			break;
			default:
			$whitespace_mode = self::WHITESPACE_IGNORE_ALL;
			break;
			}

			$skip_cache = ($whitespace_mode != self::WHITESPACE_IGNORE_ALL);
			$this->whitespaceMode = $whitespace_mode;

			$changeset = $this->changeset;

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

			} else {
			if ($skip_cache \|\| !$this->loadCache()) {

			$ignore_all = (($whitespace_mode == self::WHITESPACE_IGNORE_ALL) \|\|
			($whitespace_mode == self::WHITESPACE_IGNORE_FORCE));

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

			if (!$force_ignore) {
			if ($ignore_all && $changeset->getWhitespaceMatters()) {
			$ignore_all = false;
			}
			}

			// The "ignore all whitespace" algorithm depends on rediffing the
			// files, and we currently need complete representations of both
			// files to do anything reasonable. If we only have parts of the files,
			// don't use the "ignore all" algorithm.
			if ($ignore_all) {
			$hunks = $changeset->getHunks();
			if (count($hunks) !== 1) {
			$ignore_all = false;
			} else {
			$first_hunk = reset($hunks);
			if ($first_hunk->getOldOffset() != 1 \|\|
			$first_hunk->getNewOffset() != 1) {
			$ignore_all = false;
			}
			}
			}

			if ($ignore_all) {
			$old_file = $changeset->makeOldFile();
			$new_file = $changeset->makeNewFile();
			if ($old_file == $new_file) {
			// If the old and new files are exactly identical, the synthetic
			// diff below will give us nonsense and whitespace modes are
			// irrelevant anyway. This occurs when you, e.g., copy a file onto
			// itself in Subversion (see T271).
			$ignore_all = false;
			}
			}

			if ($ignore_all) {

			// Huge mess. Generate a "-bw" (ignore all whitespace changes) diff,
			// parse it out, and then play a shell game with the parsed format
			// in process() so we highlight only changed lines but render
			// whitespace differences. If we don't do this, we either fail to
			// render whitespace changes (which is incredibly confusing,
			// especially for python) or often produce a much larger set of
			// differences than necessary.

			$engine = new PhabricatorDifferenceEngine();
			$engine->setIgnoreWhitespace(true);
			$no_whitespace_changeset = $engine->generateChangesetFromFileContent(
			$old_file,
			$new_file);

			// subparser takes over the current non-whitespace-ignoring changeset
			$subparser = new DifferentialChangesetParser();
			$subparser->isSubparser = true;
			$subparser->setChangeset($changeset);
			foreach ($changeset->getHunks() as $hunk) {
			$subparser->parseHunk($hunk);
			}
			// We need to call process() so that the subparser's values for
			// metadata (like 'unchanged') is correct.
			$subparser->process();

			$this->subparser = $subparser;

			// While we aren't updating $this->changeset (since it has a bunch
			// of metadata we need to preserve, so that headers like "this file
			// was moved" render correctly), we're overwriting the local
			// $changeset so that the block below will choose the synthetic
			// hunks we've built instead of the original hunks.
			$changeset = $no_whitespace_changeset;
			}

			// This either uses the real hunks, or synthetic hunks we built above.
			foreach ($changeset->getHunks() as $hunk) {
			$this->parseHunk($hunk);
			}
			$this->process();
			if (!$skip_cache) {
			$this->saveCache();
			}
			}
			}
			}

			public function render(
			$range_start = null,
			$range_len = null,
			$mask_force = array()) {

			// "Top level" renders are initial requests for the whole file, versus
			// requests for a specific range generated by clicking "show more". We
			// generate property changes and "shield" UI elements only for toplevel
			// requests.
			$this->isTopLevel = (($range_start === null) && ($range_len === null));

			$this->highlightEngine = PhabricatorSyntaxHighlighter::newEngine();

			$this->tryCacheStuff();

			$shield = null;
			if ($this->isTopLevel && !$this->comments) {
			if ($this->isGenerated()) {
			$shield = $this->renderShield(
			"This file contains generated code, which does not normally need ".
			"to be reviewed.",
			true);
			} else if ($this->isUnchanged()) {
			if ($this->isWhitespaceOnly()) {
			$shield = $this->renderShield(
			"This file was changed only by adding or removing trailing ".
			"whitespace.",
			false);
			} else {
			$shield = $this->renderShield(
			"The contents of this file were not changed.",
			false);
			}
			} else if ($this->isDeleted()) {
			$shield = $this->renderShield(
			"This file was completely deleted.",
			true);
			} else if ($this->changeset->getAffectedLineCount() > 2500) {
			$lines = number_format($this->changeset->getAffectedLineCount());
			$shield = $this->renderShield(
			"This file has a very large number of changes ({$lines} lines).",
			true);
			}
			}

			if ($shield) {
			return $this->renderChangesetTable($this->changeset, $shield);
			}

			$feedback_mask = array();

			switch ($this->changeset->getFileType()) {
			case DifferentialChangeType::FILE_IMAGE:
			$old = null;
			$cur = null;
			// TODO: Improve the architectural issue as discussed in D955
			// https://secure.phabricator.com/D955
			$reference = $this->renderingReference;
			$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);
			$vs_metadata = $vs_changeset->getMetadata();
			$old_phid = idx($vs_metadata, 'new:binary-phid');

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

			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 PhabricatorFile())->loadAllWhere(
			'phid IN (%Ls)',
			$file_phids);

			foreach ($files as $file) {
			if (empty($file)) {
			continue;
			}
			if ($file->getPHID() == $old_phid) {
			$old = phutil_render_tag(
			'div',
			array(
			'class' => 'differential-image-stage'
			),
			phutil_render_tag(
			'img',
			array(
			'src' => $file->getBestURI(),
			)
			)
			);
			} else {
			$cur = phutil_render_tag(
			'div',
			array(
			'class' => 'differential-image-stage'
			),
			phutil_render_tag(
			'img',
			array(
			'src' => $file->getBestURI(),
			)
			)
			);
			}
			}
			}

			$this->comments = msort($this->comments, 'getID');
			$old_comments = array();
			$new_comments = array();
			foreach ($this->comments as $comment) {
			if ($this->isCommentOnRightSideWhenDisplayed($comment)) {
			$new_comments[] = $comment;
			} else {
			$old_comments[] = $comment;
			}
			}

			$html_old = array();
			$html_new = array();
			foreach ($old_comments as $comment) {
			$xhp = $this->renderInlineComment($comment);
			$html_old[] =
			'<tr class="inline">'.
			'<th />'.
			'<td class="left">'.$xhp.'</td>'.
			'<th />'.
			'<td class="right3" colspan="3" />'.
			'</tr>';
			}
			foreach ($new_comments as $comment) {
			$xhp = $this->renderInlineComment($comment);
			$html_new[] =
			'<tr class="inline">'.
			'<th />'.
			'<td class="left" />'.
			'<th />'.
			'<td class="right3" colspan="3">'.$xhp.'</td>'.
			'</tr>';
			}

			if (!$old) {
			$th_old = '<th></th>';
			} else {
			$th_old = '<th id="C'.$vs.'OL1">1</th>';
			}

			if (!$cur) {
			$th_new = '<th></th>';
			} else {
			$th_new = '<th id="C'.$id.'NL1">1</th>';
			}

			$output = $this->renderChangesetTable(
			$this->changeset,
			'<tr class="differential-image-diff">'.
			$th_old.
			'<td class="left differential-old-image">'.$old.'</td>'.
			$th_new.
			'<td class="right3 differential-new-image" colspan="3">'.
			$cur.
			'</td>'.
			'</tr>'.
			implode('', $html_old).
			implode('', $html_new));

			return $output;
			case DifferentialChangeType::FILE_DIRECTORY:
			case DifferentialChangeType::FILE_BINARY:
			$output = $this->renderChangesetTable($this->changeset, null);
			return $output;
			}

			$old_comments = array();
			$new_comments = array();

			$old_mask = array();
			$new_mask = array();
			$feedback_mask = array();

			if ($this->comments) {
			foreach ($this->comments as $comment) {
			$start = max($comment->getLineNumber() - self::LINES_CONTEXT, 0);
			$end = $comment->getLineNumber() +
			$comment->getLineLength() +
			self::LINES_CONTEXT;
			$new = $this->isCommentOnRightSideWhenDisplayed($comment);
			for ($ii = $start; $ii <= $end; $ii++) {
			if ($new) {
			$new_mask[$ii] = true;
			} else {
			$old_mask[$ii] = true;
			}
			}
			}

			foreach ($this->old as $ii => $old) {
			if (isset($old['line']) && isset($old_mask[$old['line']])) {
			$feedback_mask[$ii] = true;
			}
			}

			foreach ($this->new as $ii => $new) {
			if (isset($new['line']) && isset($new_mask[$new['line']])) {
			$feedback_mask[$ii] = true;
			}
			}
			$this->comments = msort($this->comments, 'getID');
			foreach ($this->comments as $comment) {
			$final = $comment->getLineNumber() +
			$comment->getLineLength();
			$final = max(1, $final);
			if ($this->isCommentOnRightSideWhenDisplayed($comment)) {
			$new_comments[$final][] = $comment;
			} else {
			$old_comments[$final][] = $comment;
			}
			}
			}

			$html = $this->renderTextChange(
			$range_start,
			$range_len,
			$mask_force,
			$feedback_mask,
			$old_comments,
			$new_comments);

			return $this->renderChangesetTable($this->changeset, $html);
			}

			/**
			* Determine if an inline comment will appear on the rendered diff,
			* taking into consideration which halves of which changesets will actually
			* be shown.
			*
			* @param PhabricatorInlineCommentInterface Comment to test for visibility.
			* @return bool True if the comment is visible on the rendered diff.
			*/
			private function isCommentVisibleOnRenderedDiff(
			PhabricatorInlineCommentInterface $comment) {

			$changeset_id = $comment->getChangesetID();
			$is_new = $comment->getIsNewFile();

			if ($changeset_id == $this->rightSideChangesetID &&
			$is_new == $this->rightSideAttachesToNewFile) {
			return true;
			}

			if ($changeset_id == $this->leftSideChangesetID &&
			$is_new == $this->leftSideAttachesToNewFile) {
			return true;
			}

			return false;
			}


			/**
			* Determine if a comment will appear on the right side of the display diff.
			* Note that the comment must appear somewhere on the rendered changeset, as
			* per isCommentVisibleOnRenderedDiff().
			*
			* @param PhabricatorInlineCommentInterface Comment to test for display
			* location.
			* @return bool True for right, false for left.
			*/
			private function isCommentOnRightSideWhenDisplayed(
			PhabricatorInlineCommentInterface $comment) {

			if (!$this->isCommentVisibleOnRenderedDiff($comment)) {
			throw new Exception("Comment is not visible on changeset!");
			}

			$changeset_id = $comment->getChangesetID();
			$is_new = $comment->getIsNewFile();

			if ($changeset_id == $this->rightSideChangesetID &&
			$is_new == $this->rightSideAttachesToNewFile) {
			return true;
			}

			return false;
			}

			protected function renderShield($message, $more) {

			if ($more) {
			$end = $this->getLength();
			$reference = $this->renderingReference;
			$more =
			' '.
			javelin_render_tag(
			'a',
			array(
			'mustcapture' => true,
			'sigil' => 'show-more',
			'class' => 'complete',
			'href' => '#',
			'meta' => array(
			'ref' => $reference,
			'range' => "0-{$end}",
			),
			),
			'Show File Contents');
			} else {
			$more = null;
			}

			return javelin_render_tag(
			'tr',
			array(
			'sigil' => 'context-target',
			),
			'<td class="differential-shield" colspan="6">'.
			phutil_escape_html($message).
			$more.
			'</td>');
			}

			protected function renderTextChange(
			$range_start,
			$range_len,
			$mask_force,
			$feedback_mask,
			array $old_comments,
			array $new_comments) {
			foreach (array_merge($old_comments, $new_comments) as $comments) {
			assert_instances_of($comments, 'PhabricatorInlineCommentInterface');
			}

			$context_not_available = null;
			if ($this->missingOld \|\| $this->missingNew) {
			$context_not_available = javelin_render_tag(
			'tr',
			array(
			'sigil' => 'context-target',
			),
			phutil_render_tag(
			'td',
			array(
			'colspan' => 6,
			'class' => 'show-more'
			),
			pht('Context not available.')
			)
			);
			}

			$html = array();

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

			if ($range_start === null) {
			$range_start = 0;
			}

			if ($range_len === null) {
			$range_len = $rows;
			}

			$range_len = min($range_len, $rows - $range_start);

			// Gaps - compute gaps in the visible display diff, where we will render
			// "Show more context" spacers. This builds an aggregate $mask of all the
			// lines we must show (because they are near changed lines, near inline
			// comments, or the request has explicitly asked for them, i.e. resulting
			// from the user clicking "show more") and then finds all the gaps between
			// visible lines. 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.

			$gaps = array();
			$gap_start = 0;
			$in_gap = false;
			$mask = $this->visible + $mask_force + $feedback_mask;
			$mask[$range_start + $range_len] = true;
			for ($ii = $range_start; $ii <= $range_start + $range_len; $ii++) {
			if (isset($mask[$ii])) {
			if ($in_gap) {
			$gap_length = $ii - $gap_start;
			if ($gap_length <= self::LINES_CONTEXT) {
			for ($jj = $gap_start; $jj <= $gap_start + $gap_length; $jj++) {
			$mask[$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);

			$reference = $this->renderingReference;

			$left_id = $this->leftSideChangesetID;
			$right_id = $this->rightSideChangesetID;

			// "N" stands for 'new' and means the comment should attach to the new file
			// when stored, i.e. DifferentialInlineComment->setIsNewFile().
			// "O" stands for 'old' and means the comment should attach to the old file.

			$left_char = $this->leftSideAttachesToNewFile
			? 'N'
			: 'O';
			$right_char = $this->rightSideAttachesToNewFile
			? 'N'
			: 'O';

			$copy_lines = idx($this->changeset->getMetadata(), 'copy:lines', array());

			if ($this->originalLeft && $this->originalRight) {
			list($highlight_old, $highlight_new) = $this->diffOriginals();
			$highlight_old = array_flip($highlight_old);
			$highlight_new = array_flip($highlight_new);
			}

			// We need to go backwards to properly indent whitespace in this code:
			//
			// 0: class C {
			// 1:
			// 1: function f() {
			// 2:
			// 2: return;
			//
			$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;
			}

			for ($ii = $range_start; $ii < $range_start + $range_len; $ii++) {
			if (empty($mask[$ii])) {
			// If we aren't going to show this line, we've just entered a gap.
			// Pop information about the next gap off the $gaps stack and render
			// an appropriate "Show more context" element. This branch eventually
			// increments $ii by the entire size of the gap and then continues
			// the loop.
			$gap = array_pop($gaps);
			$top = $gap[0];
			$len = $gap[1];

			$end = $top + $len - 20;

			$contents = array();

			if ($len > 40) {
			$is_first_block = false;
			if ($ii == 0) {
			$is_first_block = true;
			}

			$contents[] = javelin_render_tag(
			'a',
			array(
			'href' => '#',
			'mustcapture' => true,
			'sigil' => 'show-more',
			'meta' => array(
			'ref' => $reference,
			'range' => "{$top}-{$len}/{$top}-20",
			),
			),
			$is_first_block
			? "Show First 20 Lines"
			: "\xE2\x96\xB2 Show 20 Lines");
			}

			$contents[] = javelin_render_tag(
			'a',
			array(
			'href' => '#',
			'mustcapture' => true,
			'sigil' => 'show-more',
			'meta' => array(
			'type' => 'all',
			'ref' => $reference,
			'range' => "{$top}-{$len}/{$top}-{$len}",
			),
			),
			'Show All '.$len.' Lines');

			$is_last_block = false;
			if ($ii + $len >= $rows) {
			$is_last_block = true;
			}

			if ($len > 40) {
			$contents[] = javelin_render_tag(
			'a',
			array(
			'href' => '#',
			'mustcapture' => true,
			'sigil' => 'show-more',
			'meta' => array(
			'ref' => $reference,
			'range' => "{$top}-{$len}/{$end}-20",
			),
			),
			$is_last_block
			? "Show Last 20 Lines"
			: "\xE2\x96\xBC Show 20 Lines");
			}

			$context = null;
			$context_line = null;
			if (!$is_last_block && $depths[$ii + $len]) {
			for ($l = $ii + $len - 1; $l >= $ii; $l--) {
			$line = $this->new[$l]['text'];
			if ($depths[$l] < $depths[$ii + $len] && trim($line) != '') {
			$context = $this->newRender[$l];
			$context_line = $this->new[$l]['line'];
			break;
			}
			}
			}

			$container = javelin_render_tag(
			'tr',
			array(
			'sigil' => 'context-target',
			),
			'<td colspan="2" class="show-more">'.
			implode(' • ', $contents).
			'</td>'.
			'<th class="show-context-line">'.$context_line.'</td>'.
			'<td colspan="3" class="show-context">'.$context.'</td>');

			$html[] = $container;

			$ii += ($len - 1);
			continue;
			}

			$o_num = null;
			$o_classes = 'left';
			$o_text = null;
			if (isset($this->old[$ii])) {
			$o_num = $this->old[$ii]['line'];
			$o_text = isset($this->oldRender[$ii]) ? $this->oldRender[$ii] : null;
			if ($this->old[$ii]['type']) {
			if ($this->old[$ii]['type'] == '\\') {
			$o_text = $this->old[$ii]['text'];
			$o_classes .= ' comment';
			} else if ($this->originalLeft && !isset($highlight_old[$o_num])) {
			$o_classes .= ' old-rebase';
			} else if (empty($this->new[$ii])) {
			$o_classes .= ' old old-full';
			} else {
			$o_classes .= ' old';
			}
			}
			}

			$n_copy = null;
			$n_cov = null;
			$n_colspan = 3;
			$n_classes = '';
			$n_num = null;
			$n_text = null;

			if (isset($this->new[$ii])) {
			$n_num = $this->new[$ii]['line'];
			$n_text = isset($this->newRender[$ii]) ? $this->newRender[$ii] : null;

			if ($this->coverage !== null) {
			if (empty($this->coverage[$n_num - 1])) {
			$cov_class = 'N';
			} else {
			$cov_class = $this->coverage[$n_num - 1];
			}
			$cov_class = 'cov-'.$cov_class;
			$n_cov = '<td class="cov '.$cov_class.'"></td>';
			$n_colspan--;
			}


			if ($this->new[$ii]['type']) {
			if ($this->new[$ii]['type'] == '\\') {
			$n_text = $this->new[$ii]['text'];
			$n_class = 'comment';
			} else if ($this->originalRight && !isset($highlight_new[$n_num])) {
			$n_class = 'new-rebase';
			} else if (empty($this->old[$ii])) {
			$n_class = 'new new-full';
			} else {
			$n_class = 'new';
			}
			$n_classes = $n_class;

			if ($this->new[$ii]['type'] == '\\' \|\| !isset($copy_lines[$n_num])) {
			$n_copy = '<td class="copy '.$n_class.'"></td>';
			} else {
			list($orig_file, $orig_line, $orig_type) = $copy_lines[$n_num];
			$title = ($orig_type == '-' ? 'Moved' : 'Copied').' from ';
			if ($orig_file == '') {
			$title .= "line {$orig_line}";
			} else {
			$title .=
			basename($orig_file).
			":{$orig_line} in dir ".
			dirname('/'.$orig_file);
			}
			$class = ($orig_type == '-' ? 'new-move' : 'new-copy');
			$n_copy = javelin_render_tag(
			'td',
			array(
			'meta' => array(
			'msg' => $title,
			),
			'class' => 'copy '.$class,
			),
			'');
			}
			}
			$n_colspan--;
			}
			$n_classes .= ' right'.$n_colspan;


			if (($o_num && !empty($this->missingOld[$o_num])) \|\|
			($n_num && !empty($this->missingNew[$n_num]))) {
			$html[] = $context_not_available;
			}

			if ($o_num && $left_id) {
			$o_id = ' id="C'.$left_id.$left_char.'L'.$o_num.'"';
			} else {
			$o_id = null;
			}

			if ($n_num && $right_id) {
			$n_id = ' id="C'.$right_id.$right_char.'L'.$n_num.'"';
			} else {
			$n_id = null;
			}

			// NOTE: The Javascript is sensitive to whitespace changes in this
			// block!

			$html[] =
			'<tr>'.
			'<th'.$o_id.'>'.$o_num.'</th>'.
			'<td class="'.$o_classes.'">'.$o_text.'</td>'.
			'<th'.$n_id.'>'.$n_num.'</th>'.
			$n_copy.
			// NOTE: This is a unicode zero-width space, which we use as a hint
			// when intercepting 'copy' events to make sure sensible text ends
			// up on the clipboard. See the 'phabricator-oncopy' behavior.
			'<td class="'.$n_classes.'" colspan="'.$n_colspan.'">'.
			"\xE2\x80\x8B".$n_text.
			'</td>'.
			$n_cov.
			'</tr>';

			if ($context_not_available && ($ii == $rows - 1)) {
			$html[] = $context_not_available;
			}

			if ($o_num && isset($old_comments[$o_num])) {
			foreach ($old_comments[$o_num] as $comment) {
			$xhp = $this->renderInlineComment($comment);
			$new = '';
			if ($n_num && isset($new_comments[$n_num])) {
			foreach ($new_comments[$n_num] as $key => $new_comment) {
			if ($comment->isCompatible($new_comment)) {
			$new = $this->renderInlineComment($new_comment);
			unset($new_comments[$n_num][$key]);
			}
			}
			}
			$html[] =
			'<tr class="inline">'.
			'<th />'.
			'<td class="left">'.$xhp.'</td>'.
			'<th />'.
			'<td colspan="2">'.$new.'</td>'.
			'<td class="cov" />'.
			'</tr>';
			}
			}
			if ($n_num && isset($new_comments[$n_num])) {
			foreach ($new_comments[$n_num] as $comment) {
			$xhp = $this->renderInlineComment($comment);
			$html[] =
			'<tr class="inline">'.
			'<th />'.
			'<td class="left" />'.
			'<th />'.
			'<td colspan="2">'.$xhp.'</td>'.
			'<td class="cov" />'.
			'</tr>';
			}
			}
			}

			return implode('', $html);
			}

			private function renderInlineComment(
			PhabricatorInlineCommentInterface $comment) {

			$user = $this->user;
			$edit = $user &&
			($comment->getAuthorPHID() == $user->getPHID()) &&
			($comment->isDraft());
			$allow_reply = (bool)$this->user;

			$on_right = $this->isCommentOnRightSideWhenDisplayed($comment);

			return id(new DifferentialInlineCommentView())
			->setInlineComment($comment)
			->setOnRight($on_right)
			->setHandles($this->handles)
			->setMarkupEngine($this->markupEngine)
			->setEditable($edit)
			->setAllowReply($allow_reply)
			->render();
			}

			protected function renderPropertyChangeHeader($changeset) {
			if (!$this->isTopLevel) {
			// We render properties only at top level; otherwise we get multiple
			// copies of them when a user clicks "Show More".
			return null;
			}

			$old = $changeset->getOldProperties();
			$new = $changeset->getNewProperties();

			if ($old === $new) {
			return null;
			}

			if ($changeset->getChangeType() == DifferentialChangeType::TYPE_ADD &&
			$new == array('unix:filemode' => '100644')) {
			return null;
			}

			if ($changeset->getChangeType() == DifferentialChangeType::TYPE_DELETE &&
			$old == array('unix:filemode' => '100644')) {
			return null;
			}

			$keys = array_keys($old + $new);
			sort($keys);

			$rows = array();
			foreach ($keys as $key) {
			$oval = idx($old, $key);
			$nval = idx($new, $key);
			if ($oval !== $nval) {
			if ($oval === null) {
			$oval = '<em>null</em>';
			} else {
			$oval = nl2br(phutil_escape_html($oval));
			}

			if ($nval === null) {
			$nval = '<em>null</em>';
			} else {
			$nval = nl2br(phutil_escape_html($nval));
			}

			$rows[] =
			'<tr>'.
			'<th>'.phutil_escape_html($key).'</th>'.
			'<td class="oval">'.$oval.'</td>'.
			'<td class="nval">'.$nval.'</td>'.
			'</tr>';
			}
			}

			return
			'<table class="differential-property-table">'.
			'<tr class="property-table-header">'.
			'<th>Property Changes</th>'.
			'<td class="oval">Old Value</td>'.
			'<td class="nval">New Value</td>'.
			'</tr>'.
			implode('', $rows).
			'</table>';
			}

			protected function renderChangesetTable($changeset, $contents) {
			$props = $this->renderPropertyChangeHeader($this->changeset);
			$table = null;
			if ($contents) {
			$table = javelin_render_tag(
			'table',
			array(
			'class' => 'differential-diff remarkup-code PhabricatorMonospaced',
			'sigil' => 'differential-diff',
			),
			$contents);
			}

			if (!$table && !$props) {
			$notice = $this->renderChangeTypeHeader($this->changeset, true);
			} else {
			$notice = $this->renderChangeTypeHeader($this->changeset, false);
			}

			$result = implode(
			"\n",
			array(
			$notice,
			$props,
			$table,
			));

			// TODO: Let the user customize their tab width / display style.
			$result = str_replace("\t", ' ', $result);

			// TODO: We should possibly post-process "\r" as well.

			return $result;
			}

			protected function renderChangeTypeHeader($changeset, $force) {
			$change = $changeset->getChangeType();
			$file = $changeset->getFileType();

			$message = null;
			if ($change == DifferentialChangeType::TYPE_CHANGE &&
			$file == DifferentialChangeType::FILE_TEXT) {
			if ($force) {
			// We have to force something to render because there were no changes
			// of other kinds.
			$message = pht('This file was not modified.');
			} else {
			// Default case of changes to a text file, no metadata.
			return null;
			}
			} else {
			switch ($change) {

			case DifferentialChangeType::TYPE_ADD:
			switch ($file) {
			case DifferentialChangeType::FILE_TEXT:
			$message = pht('This file was <strong>added</strong>.');
			break;
			case DifferentialChangeType::FILE_IMAGE:
			$message = pht('This image was <strong>added</strong>.');
			break;
			case DifferentialChangeType::FILE_DIRECTORY:
			$message = pht('This directory was <strong>added</strong>.');
			break;
			case DifferentialChangeType::FILE_BINARY:
			$message = pht('This binary file was <strong>added</strong>.');
			break;
			case DifferentialChangeType::FILE_SYMLINK:
			$message = pht('This symlink was <strong>added</strong>.');
			break;
			case DifferentialChangeType::FILE_SUBMODULE:
			$message = pht('This submodule was <strong>added</strong>.');
			break;
			}
			break;

			case DifferentialChangeType::TYPE_DELETE:
			switch ($file) {
			case DifferentialChangeType::FILE_TEXT:
			$message = pht('This file was <strong>deleted</strong>.');
			break;
			case DifferentialChangeType::FILE_IMAGE:
			$message = pht('This image was <strong>deleted</strong>.');
			break;
			case DifferentialChangeType::FILE_DIRECTORY:
			$message = pht('This directory was <strong>deleted</strong>.');
			break;
			case DifferentialChangeType::FILE_BINARY:
			$message = pht('This binary file was <strong>deleted</strong>.');
			break;
			case DifferentialChangeType::FILE_SYMLINK:
			$message = pht('This symlink was <strong>deleted</strong>.');
			break;
			case DifferentialChangeType::FILE_SUBMODULE:
			$message = pht('This submodule was <strong>deleted</strong>.');
			break;
			}
			break;

			case DifferentialChangeType::TYPE_MOVE_HERE:
			$from =
			"<strong>".
			phutil_escape_html($changeset->getOldFile()).
			"</strong>";
			switch ($file) {
			case DifferentialChangeType::FILE_TEXT:
			$message = pht('This file was moved from %s.', $from);
			break;
			case DifferentialChangeType::FILE_IMAGE:
			$message = pht('This image was moved from %s.', $from);
			break;
			case DifferentialChangeType::FILE_DIRECTORY:
			$message = pht('This directory was moved from %s.', $from);
			break;
			case DifferentialChangeType::FILE_BINARY:
			$message = pht('This binary file was moved from %s.', $from);
			break;
			case DifferentialChangeType::FILE_SYMLINK:
			$message = pht('This symlink was moved from %s.', $from);
			break;
			case DifferentialChangeType::FILE_SUBMODULE:
			$message = pht('This submodule was moved from %s.', $from);
			break;
			}
			break;

			case DifferentialChangeType::TYPE_COPY_HERE:
			$from =
			"<strong>".
			phutil_escape_html($changeset->getOldFile()).
			"</strong>";
			switch ($file) {
			case DifferentialChangeType::FILE_TEXT:
			$message = pht('This file was copied from %s.', $from);
			break;
			case DifferentialChangeType::FILE_IMAGE:
			$message = pht('This image was copied from %s.', $from);
			break;
			case DifferentialChangeType::FILE_DIRECTORY:
			$message = pht('This directory was copied from %s.', $from);
			break;
			case DifferentialChangeType::FILE_BINARY:
			$message = pht('This binary file was copied from %s.', $from);
			break;
			case DifferentialChangeType::FILE_SYMLINK:
			$message = pht('This symlink was copied from %s.', $from);
			break;
			case DifferentialChangeType::FILE_SUBMODULE:
			$message = pht('This submodule was copied from %s.', $from);
			break;
			}
			break;

			case DifferentialChangeType::TYPE_MOVE_AWAY:
			$paths =
			"<strong>".
			phutil_escape_html(implode(', ', $changeset->getAwayPaths())).
			"</strong>";
			switch ($file) {
			case DifferentialChangeType::FILE_TEXT:
			$message = pht('This file was moved to %s.', $paths);
			break;
			case DifferentialChangeType::FILE_IMAGE:
			$message = pht('This image was moved to %s.', $paths);
			break;
			case DifferentialChangeType::FILE_DIRECTORY:
			$message = pht('This directory was moved to %s.', $paths);
			break;
			case DifferentialChangeType::FILE_BINARY:
			$message = pht('This binary file was moved to %s.', $paths);
			break;
			case DifferentialChangeType::FILE_SYMLINK:
			$message = pht('This symlink was moved to %s.', $paths);
			break;
			case DifferentialChangeType::FILE_SUBMODULE:
			$message = pht('This submodule was moved to %s.', $paths);
			break;
			}
			break;

			case DifferentialChangeType::TYPE_COPY_AWAY:
			$paths =
			"<strong>".
			phutil_escape_html(implode(', ', $changeset->getAwayPaths())).
			"</strong>";
			switch ($file) {
			case DifferentialChangeType::FILE_TEXT:
			$message = pht('This file was copied to %s.', $paths);
			break;
			case DifferentialChangeType::FILE_IMAGE:
			$message = pht('This image was copied to %s.', $paths);
			break;
			case DifferentialChangeType::FILE_DIRECTORY:
			$message = pht('This directory was copied to %s.', $paths);
			break;
			case DifferentialChangeType::FILE_BINARY:
			$message = pht('This binary file was copied to %s.', $paths);
			break;
			case DifferentialChangeType::FILE_SYMLINK:
			$message = pht('This symlink was copied to %s.', $paths);
			break;
			case DifferentialChangeType::FILE_SUBMODULE:
			$message = pht('This submodule was copied to %s.', $paths);
			break;
			}
			break;

			case DifferentialChangeType::TYPE_MULTICOPY:
			$paths =
			"<strong>".
			phutil_escape_html(implode(', ', $changeset->getAwayPaths())).
			"</strong>";
			switch ($file) {
			case DifferentialChangeType::FILE_TEXT:
			$message = pht(
			'This file was deleted after being copied to %s.',
			$paths);
			break;
			case DifferentialChangeType::FILE_IMAGE:
			$message = pht(
			'This image was deleted after being copied to %s.',
			$paths);
			break;
			case DifferentialChangeType::FILE_DIRECTORY:
			$message = pht(
			'This directory was deleted after being copied to %s.',
			$paths);
			break;
			case DifferentialChangeType::FILE_BINARY:
			$message = pht(
			'This binary file was deleted after being copied to %s.',
			$paths);
			break;
			case DifferentialChangeType::FILE_SYMLINK:
			$message = pht(
			'This symlink was deleted after being copied to %s.',
			$paths);
			break;
			case DifferentialChangeType::FILE_SUBMODULE:
			$message = pht(
			'This submodule was deleted after being copied to %s.',
			$paths);
			break;
			}
			break;

			default:
			switch ($file) {
			case DifferentialChangeType::FILE_TEXT:
			$message = pht('This is a file.');
			break;
			case DifferentialChangeType::FILE_IMAGE:
			$message = pht('This is an image.');
			break;
			case DifferentialChangeType::FILE_DIRECTORY:
			$message = pht('This is a directory.');
			break;
			case DifferentialChangeType::FILE_BINARY:
			$message = pht('This is a binary file.');
			break;
			case DifferentialChangeType::FILE_SYMLINK:
			$message = pht('This is a symlink.');
			break;
			case DifferentialChangeType::FILE_SUBMODULE:
			$message = pht('This is a submodule.');
			break;
			}
			break;
			}
			}

			return
			'<div class="differential-meta-notice">'.
			$message.
			'</div>';
			}

			public function renderForEmail() {
			$ret = '';

			$min = min(count($this->old), count($this->new));
			for ($i = 0; $i < $min; $i++) {
			$o = $this->old[$i];
			$n = $this->new[$i];

			if (!isset($this->visible[$i])) {
			continue;
			}

			if ($o['line'] && $n['line']) {
			// It is quite possible there are better ways to achieve this. For
			// example, "white-space: pre;" can do a better job, WERE IT NOT for
			// broken email clients like OWA which use newlines to do weird
			// wrapping. So dont give them newlines.
			if (isset($this->intra[$i])) {
			$ret .= sprintf(
			"<font color=\"red\">- %s</font><br/>",
			str_replace(" ", " ", phutil_escape_html($o['text']))
			);
			$ret .= sprintf(
			"<font color=\"green\">+ %s</font><br/>",
			str_replace(" ", " ", phutil_escape_html($n['text']))
			);
			} else {
			$ret .= sprintf("  %s<br/>",
			str_replace(" ", " ", phutil_escape_html($n['text']))
			);
			}
			} else if ($o['line'] && !$n['line']) {
			$ret .= sprintf(
			"<font color=\"red\">- %s</font><br/>",
			str_replace(" ", " ", phutil_escape_html($o['text']))
			);
			} else {
			$ret .= sprintf(
			"<font color=\"green\">+ %s</font><br/>",
			str_replace(" ", " ", phutil_escape_html($n['text']))
			);
			}
			}

			return $ret;
			}

			/**
			* Parse the 'range' specification that this class and the client-side JS
			* emit to indicate that a user clicked "Show more..." on a diff. Generally,
			* use is something like this:
			*
			* $spec = $request->getStr('range');
			* $parsed = DifferentialChangesetParser::parseRangeSpecification($spec);
			* list($start, $end, $mask) = $parsed;
			* $parser->render($start, $end, $mask);
			*
			* @param string Range specification, indicating the range of the diff that
			* should be rendered.
			* @return tuple List of <start, end, mask> suitable for passing to
			* @{method:render}.
			*/
			public static function parseRangeSpecification($spec) {
			$range_s = null;
			$range_e = null;
			$mask = array();

			if ($spec) {
			$match = null;
			if (preg_match('@^(\d+)-(\d+)(?:/(\d+)-(\d+))?$@', $spec, $match)) {
			$range_s = (int)$match[1];
			$range_e = (int)$match[2];
			if (count($match) > 3) {
			$start = (int)$match[3];
			$len = (int)$match[4];
			for ($ii = $start; $ii < $start + $len; $ii++) {
			$mask[$ii] = true;
			}
			}
			}
			}

			return array($range_s, $range_e, $mask);
			}

			/**
			* Render "modified coverage" information; test coverage on modified lines.
			* This synthesizes diff information with unit test information into a useful
			* indicator of how well tested a change is.
			*/
			public function renderModifiedCoverage() {
			$na = '<em>-</em>';

			if (!$this->coverage) {
			return $na;
			}

			$covered = 0;
			$not_covered = 0;

			foreach ($this->new as $k => $new) {
			if (!$new['line']) {
			continue;
			}

			if (!$new['type']) {
			continue;
			}

			if (empty($this->coverage[$new['line'] - 1])) {
			continue;
			}

			switch ($this->coverage[$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)));
			}

			}

phab/src/applications/differential/parser/DifferentialChangesetParser.php210f8e03903aproduction

DifferentialChangesetParser.phpView Options

phab/src/applications/differential/parser/DifferentialChangesetParser.php
210f8e03903aproduction

DifferentialChangesetParser.php
View Options