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Use a hash-and-diff strategy to produce a diff layout for block-based documents
Summary: Depends on D20835. Ref T13425. Ref T13414. When a document has a list of content blocks, we may not be able to diff it directly, but we can hash each block and then diff the hashes (internally "diff" also does approximately the same thing). We could do this ourselves with slightly fewer layers of indirection, but: diff already exists; we already use it; we already have a bunch of abstractions on top of it; and it's likely much faster on large inputs than the best we can do in PHP. Test Plan: {F6888169} Maniphest Tasks: T13425, T13414 Differential Revision: https://secure.phabricator.com/D20836
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932d829af3
commit
281598d65c
7 changed files with 115 additions and 24 deletions
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@ -11,7 +11,7 @@ return array(
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'conpherence.pkg.js' => '020aebcf',
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'core.pkg.css' => '6a8c9533',
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'core.pkg.js' => '6e5c894f',
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'differential.pkg.css' => 'ce54994e',
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'differential.pkg.css' => 'abd2c0d8',
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'differential.pkg.js' => '68fa36fc',
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'diffusion.pkg.css' => '42c75c37',
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'diffusion.pkg.js' => 'a98c0bf7',
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@ -61,7 +61,7 @@ return array(
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'rsrc/css/application/dashboard/dashboard.css' => '5a205b9d',
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'rsrc/css/application/diff/inline-comment-summary.css' => '81eb368d',
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'rsrc/css/application/differential/add-comment.css' => '7e5900d9',
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'rsrc/css/application/differential/changeset-view.css' => 'db306b82',
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'rsrc/css/application/differential/changeset-view.css' => '5dda5e53',
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'rsrc/css/application/differential/core.css' => '7300a73e',
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'rsrc/css/application/differential/phui-inline-comment.css' => '48acce5b',
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'rsrc/css/application/differential/revision-comment.css' => '7dbc8d1d',
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@ -554,7 +554,7 @@ return array(
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'conpherence-thread-manager' => 'aec8e38c',
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'conpherence-transaction-css' => '3a3f5e7e',
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'd3' => '9d068042',
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'differential-changeset-view-css' => 'db306b82',
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'differential-changeset-view-css' => '5dda5e53',
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'differential-core-view-css' => '7300a73e',
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'differential-revision-add-comment-css' => '7e5900d9',
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'differential-revision-comment-css' => '7dbc8d1d',
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@ -1457,6 +1457,9 @@ return array(
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'javelin-dom',
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'phuix-dropdown-menu',
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),
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'5dda5e53' => array(
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'phui-inline-comment-view-css',
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),
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'5faf27b9' => array(
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'phuix-form-control-view',
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),
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@ -2069,9 +2072,6 @@ return array(
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'javelin-uri',
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'phabricator-notification',
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),
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'db306b82' => array(
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'phui-inline-comment-view-css',
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),
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'dfa1d313' => array(
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'javelin-behavior',
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'javelin-dom',
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@ -379,7 +379,15 @@ final class DifferentialChangesetTwoUpRenderer
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if ($old) {
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$old_content = $old->newContentView();
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$old_key = $old->getBlockKey();
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$old_classes = implode(' ', $old->getClasses());
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$old_classes = $old->getClasses();
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if ($old->getDifferenceType() === '-') {
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$old_classes[] = 'old';
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$old_classes[] = 'old-full';
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}
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$old_classes = implode(' ', $old_classes);
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} else {
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$old_content = null;
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$old_key = null;
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@ -389,7 +397,14 @@ final class DifferentialChangesetTwoUpRenderer
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if ($new) {
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$new_content = $new->newContentView();
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$new_key = $new->getBlockKey();
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$new_classes = implode(' ', $new->getClasses());
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$new_classes = $new->getClasses();
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if ($new->getDifferenceType() === '+') {
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$new_classes[] = 'new';
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$new_classes[] = 'new-full';
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}
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$new_classes = implode(' ', $new_classes);
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} else {
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$new_content = null;
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$new_key = null;
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@ -6,6 +6,8 @@ final class PhabricatorDocumentEngineBlock
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private $blockKey;
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private $content;
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private $classes = array();
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private $differenceHash;
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private $differenceType;
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public function setContent($content) {
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$this->content = $content;
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@ -38,4 +40,22 @@ final class PhabricatorDocumentEngineBlock
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return $this->classes;
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}
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public function setDifferenceHash($difference_hash) {
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$this->differenceHash = $difference_hash;
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return $this;
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}
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public function getDifferenceHash() {
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return $this->differenceHash;
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}
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public function setDifferenceType($difference_type) {
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$this->differenceType = $difference_type;
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return $this;
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}
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public function getDifferenceType() {
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return $this->differenceType;
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}
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}
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@ -20,28 +20,54 @@ final class PhabricatorDocumentEngineBlocks
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$rows = array();
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$lists = $this->lists;
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$idx = 0;
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while (true) {
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$found_any = false;
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$specs = array();
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foreach ($this->lists as $list) {
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$specs[] = $this->newDiffSpec($list['blocks']);
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}
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$row = array();
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foreach ($lists as $list) {
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$blocks = $list['blocks'];
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$cell = idx($blocks, $idx);
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$old_map = $specs[0]['map'];
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$new_map = $specs[1]['map'];
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if ($cell !== null) {
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$found_any = true;
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}
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$old_list = $specs[0]['list'];
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$new_list = $specs[1]['list'];
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$row[] = $cell;
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$changeset = id(new PhabricatorDifferenceEngine())
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->generateChangesetFromFileContent($old_list, $new_list);
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$hunk_parser = id(new DifferentialHunkParser())
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->parseHunksForLineData($changeset->getHunks())
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->reparseHunksForSpecialAttributes();
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$old_lines = $hunk_parser->getOldLines();
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$new_lines = $hunk_parser->getNewLines();
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$rows = array();
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$count = count($old_lines);
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for ($ii = 0; $ii < $count; $ii++) {
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$old_line = idx($old_lines, $ii);
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$new_line = idx($new_lines, $ii);
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if ($old_line) {
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$old_hash = rtrim($old_line['text'], "\n");
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$old_block = array_shift($old_map[$old_hash]);
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$old_block->setDifferenceType($old_line['type']);
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} else {
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$old_block = null;
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}
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if (!$found_any) {
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break;
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if ($new_line) {
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$new_hash = rtrim($new_line['text'], "\n");
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$new_block = array_shift($new_map[$new_hash]);
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$new_block->setDifferenceType($new_line['type']);
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} else {
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$new_block = null;
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}
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$rows[] = $row;
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$idx++;
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$rows[] = array(
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$old_block,
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$new_block,
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);
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}
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return $rows;
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@ -80,4 +106,25 @@ final class PhabricatorDocumentEngineBlocks
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}
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private function newDiffSpec(array $blocks) {
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$map = array();
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$list = array();
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foreach ($blocks as $block) {
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$hash = $block->getDifferenceHash();
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if (!isset($map[$hash])) {
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$map[$hash] = array();
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}
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$map[$hash][] = $block;
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$list[] = $hash;
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}
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return array(
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'map' => $map,
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'list' => implode("\n", $list)."\n",
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);
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}
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}
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@ -55,9 +55,12 @@ final class PhabricatorImageDocumentEngine
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'src' => $file->getBestURI(),
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)));
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$hash = $file->getContentHash();
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$blocks[] = id(new PhabricatorDocumentEngineBlock())
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->setBlockKey('1')
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->addClass('diff-image-cell')
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->setDifferenceHash($hash)
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->setContent($image_view);
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return $blocks;
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@ -82,8 +82,13 @@ final class PhabricatorJupyterDocumentEngine
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),
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$notebook_table);
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$hash = PhabricatorHash::digestWithNamedKey(
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serialize($cell),
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'document-engine.content-digest');
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$blocks[] = id(new PhabricatorDocumentEngineBlock())
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->setBlockKey($idx)
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->setDifferenceHash($hash)
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->setContent($container);
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$idx++;
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@ -282,7 +282,8 @@ td.cov-I {
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font-weight: bold;
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}
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.differential-diff .diff-image-cell {
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.differential-diff td.diff-image-cell {
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background-color: transparent;
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background-image: url(/rsrc/image/checker_light.png);
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padding: 8px;
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}
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