PhabricatorSearchResultView.php
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	<?php

	final class PhabricatorSearchResultView extends AphrontView {

	private $handle;
	private $object;
	private $tokens;

	public function setHandle(PhabricatorObjectHandle $handle) {
	$this->handle = $handle;
	return $this;
	}

	public function setTokens(array $tokens) {
	assert_instances_of($tokens, 'PhabricatorFulltextToken');
	$this->tokens = $tokens;
	return $this;
	}

	public function setObject($object) {
	$this->object = $object;
	return $this;
	}

	public function render() {
	$handle = $this->handle;
	if (!$handle->isComplete()) {
	return;
	}

	require_celerity_resource('phabricator-search-results-css');

	$type_name = nonempty($handle->getTypeName(), pht('Document'));

	$raw_title = $handle->getFullName();
	$title = $this->emboldenQuery($raw_title);

	$item = id(new PHUIObjectItemView())
	->setHeader($title)
	->setTitleText($raw_title)
	->setHref($handle->getURI())
	->setImageURI($handle->getImageURI())
	->addAttribute($type_name);

	if ($handle->getStatus() == PhabricatorObjectHandle::STATUS_CLOSED) {
	$item->setDisabled(true);
	$item->addAttribute(pht('Closed'));
	}

	return $item;
	}


	/**
	* Find the words which are part of the query string, and bold them in a
	* result string. This makes it easier for users to see why a result
	* matched their query.
	*/
	private function emboldenQuery($str) {
	$tokens = $this->tokens;

	if (!$tokens) {
	return $str;
	}

	if (count($tokens) > 16) {
	return $str;
	}

	if (!strlen($str)) {
	return $str;
	}

	if (strlen($str) > 2048) {
	return $str;
	}

	$patterns = array();
	foreach ($tokens as $token) {
	$raw_token = $token->getToken();
	$operator = $raw_token->getOperator();

	$value = $raw_token->getValue();

	switch ($operator) {
	case PhutilSearchQueryCompiler::OPERATOR_SUBSTRING:
	case PhutilSearchQueryCompiler::OPERATOR_EXACT:
	$patterns[] = '(('.preg_quote($value).'))ui';
	break;
	case PhutilSearchQueryCompiler::OPERATOR_AND:
	$patterns[] = '((?<=\W\|^)('.preg_quote($value).')(?=\W\|\z))ui';
	break;
	default:
	// Don't highlight anything else, particularly "NOT".
	break;
	}
	}

	// Find all matches for all query terms in the document title, then reduce
	// them to a map from offsets to highlighted sequence lengths. If two terms
	// match at the same position, we choose the longer one.
	$all_matches = array();
	foreach ($patterns as $pattern) {
	$matches = null;
	$ok = preg_match_all(
	$pattern,
	$str,
	$matches,
	PREG_OFFSET_CAPTURE);
	if (!$ok) {
	continue;
	}

	foreach ($matches[1] as $match) {
	$match_text = $match[0];
	$match_offset = $match[1];

	if (!isset($all_matches[$match_offset])) {
	$all_matches[$match_offset] = 0;
	}

	$all_matches[$match_offset] = max(
	$all_matches[$match_offset],
	strlen($match_text));
	}
	}

	// Go through the string one display glyph at a time. If a glyph starts
	// on a highlighted byte position, turn on highlighting for the number
	// of matching bytes. If a query searches for "e" and the document contains
	// an "e" followed by a bunch of combining marks, this will correctly
	// highlight the entire glyph.
	$parts = array();
	$highlight = 0;
	$offset = 0;
	foreach (phutil_utf8v_combined($str) as $character) {
	$length = strlen($character);

	if (isset($all_matches[$offset])) {
	$highlight = $all_matches[$offset];
	}

	if ($highlight > 0) {
	$is_highlighted = true;
	$highlight -= $length;
	} else {
	$is_highlighted = false;
	}

	$parts[] = array(
	'text' => $character,
	'highlighted' => $is_highlighted,
	);

	$offset += $length;
	}

	// Combine all the sequences together so we aren't emitting a tag around
	// every individual character.
	$last = null;
	foreach ($parts as $key => $part) {
	if ($last !== null) {
	if ($part['highlighted'] == $parts[$last]['highlighted']) {
	$parts[$last]['text'] .= $part['text'];
	unset($parts[$key]);
	continue;
	}
	}

	$last = $key;
	}

	// Finally, add tags.
	$result = array();
	foreach ($parts as $part) {
	if ($part['highlighted']) {
	$result[] = phutil_tag('strong', array(), $part['text']);
	} else {
	$result[] = $part['text'];
	}
	}

	return $result;
	}

	}

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