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PhabricatorDocumentEngineBlocks.php
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PhabricatorDocumentEngineBlocks.php
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<?php
final class PhabricatorDocumentEngineBlocks
extends Phobject {
private $lists = array();
private $messages = array();
public function addMessage($message) {
$this->messages[] = $message;
return $this;
}
public function getMessages() {
return $this->messages;
}
public function addBlockList(PhabricatorDocumentRef $ref, array $blocks) {
assert_instances_of($blocks, 'PhabricatorDocumentEngineBlock');
$this->lists[] = array(
'ref' => $ref,
'blocks' => array_values($blocks),
);
return $this;
}
public function newTwoUpLayout() {
$rows = array();
$lists = $this->lists;
if (count($lists) != 2) {
return array();
}
$specs = array();
foreach ($this->lists as $list) {
$specs[] = $this->newDiffSpec($list['blocks']);
}
$old_map = $specs[0]['map'];
$new_map = $specs[1]['map'];
$old_list = $specs[0]['list'];
$new_list = $specs[1]['list'];
$changeset = id(new PhabricatorDifferenceEngine())
->generateChangesetFromFileContent($old_list, $new_list);
$hunk_parser = id(new DifferentialHunkParser())
->parseHunksForLineData($changeset->getHunks())
->reparseHunksForSpecialAttributes();
$hunk_parser->generateVisibleLinesMask(2);
$mask = $hunk_parser->getVisibleLinesMask();
$old_lines = $hunk_parser->getOldLines();
$new_lines = $hunk_parser->getNewLines();
$rows = array();
$count = count($old_lines);
for ($ii = 0; $ii < $count; $ii++) {
$old_line = idx($old_lines, $ii);
$new_line = idx($new_lines, $ii);
$is_visible = !empty($mask[$ii + 1]);
// TODO: There's currently a bug where one-line files get incorrectly
// masked. This causes images to completely fail to render. Just ignore
// the mask if it came back empty.
if (!$mask) {
$is_visible = true;
}
if ($old_line) {
$old_hash = rtrim($old_line['text'], "\n");
if (!strlen($old_hash)) {
// This can happen when one of the sources has no blocks.
$old_block = null;
} else {
$old_block = array_shift($old_map[$old_hash]);
$old_block
->setDifferenceType($old_line['type'])
->setIsVisible($is_visible);
}
} else {
$old_block = null;
}
if ($new_line) {
$new_hash = rtrim($new_line['text'], "\n");
if (!strlen($new_hash)) {
$new_block = null;
} else {
$new_block = array_shift($new_map[$new_hash]);
$new_block
->setDifferenceType($new_line['type'])
->setIsVisible($is_visible);
}
} else {
$new_block = null;
}
// If both lists are empty, we may generate a row which has two empty
// blocks.
if (!$old_block && !$new_block) {
continue;
}
$rows[] = array(
$old_block,
$new_block,
);
}
return $rows;
}
public function newOneUpLayout() {
$rows = array();
$lists = $this->lists;
$idx = 0;
while (true) {
$found_any = false;
$row = array();
foreach ($lists as $list) {
$blocks = $list['blocks'];
$cell = idx($blocks, $idx);
if ($cell !== null) {
$found_any = true;
}
if ($cell) {
$rows[] = $cell;
}
}
if (!$found_any) {
break;
}
$idx++;
}
return $rows;
}
private function newDiffSpec(array $blocks) {
$map = array();
$list = array();
foreach ($blocks as $block) {
$hash = $block->getDifferenceHash();
if (!isset($map[$hash])) {
$map[$hash] = array();
}
$map[$hash][] = $block;
$list[] = $hash;
}
return array(
'map' => $map,
'list' => implode("\n", $list)."\n",
);
}
}

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