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Made further tweaks to search results formatting

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- Updated page names to not be limited to a certain length.
- Added better start/end fill logic.
- Prevented <strong> tags from being counted towards the target content
  length desired from the formatter.
This commit is contained in:
Dan Brown 2021-11-13 14:37:40 +00:00
parent 221458ccfd
commit 755dc99c72
No known key found for this signature in database
GPG Key ID: 46D9F943C24A2EF9
1 changed files with 36 additions and 10 deletions
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46
app/Entities/Tools/SearchResultsFormatter.php
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@ -37,9 +37,10 @@ class SearchResultsFormatter
];
foreach ($originalContentByNewAttribute as $attributeName => $content) {
$targetLength = ($attributeName === 'preview_name') ? 0 : 260;
$matchRefs = $this->getMatchPositions($content, $terms);
$mergedRefs = $this->sortAndMergeMatchPositions($matchRefs);
$formatted = $this->formatTextUsingMatchPositions($mergedRefs, $content);
$formatted = $this->formatTextUsingMatchPositions($mergedRefs, $content, $targetLength);
$entity->setAttribute($attributeName, new HtmlString($formatted));
}
@ -132,15 +133,25 @@ class SearchResultsFormatter
/**
* Format the given original text, returning a version where terms are highlighted within.
* Returned content is in HTML text format.
* A given $targetLength of 0 asserts no target length limit.
*
* This is a complex function but written to be relatively efficient, going through the term matches in order
* so that we're only doing a one-time loop through of the matches. There is no further searching
* done within here.
*/
protected function formatTextUsingMatchPositions(array $matchPositions, string $originalText): string
protected function formatTextUsingMatchPositions(array $matchPositions, string $originalText, int $targetLength): string
{
$contextRange = 32;
$targetLength = 260;
$maxEnd = strlen($originalText);
$lastEnd = 0;
$firstStart = null;
$fetchAll = ($targetLength === 0);
$content = '';
$contentTextLength = 0;
if ($fetchAll) {
$targetLength = $maxEnd * 2;
}
foreach ($matchPositions as $start => $end) {
// Get our outer text ranges for the added context we want to show upon the result.
@ -151,18 +162,30 @@ class SearchResultsFormatter
$startDiff = $start - $lastEnd;
if ($startDiff < 0) {
$contextStart = $start;
// Trims off '$startDiff' number of characters to bring it back to the start
// if this current match zone.
$content = substr($content, 0, strlen($content) + $startDiff);
$contentTextLength += $startDiff;
}
// Add ellipsis between results
if ($contextStart !== 0 && $contextStart !== $start) {
if (!$fetchAll && $contextStart !== 0 && $contextStart !== $start) {
$content .= ' ...';
$contentTextLength += 4;
} else if ($fetchAll) {
// Or fill in gap since the previous match
$fillLength = $contextStart - $lastEnd;
$content .= e(substr($originalText, $lastEnd, $fillLength));
$contentTextLength += $fillLength;
}
// Add our content including the bolded matching text
$content .= e(substr($originalText, $contextStart, $start - $contextStart));
$contentTextLength += $start - $contextStart;
$content .= '<strong>' . e(substr($originalText, $start, $end - $start)) . '</strong>';
$contentTextLength += $end - $start;
$content .= e(substr($originalText, $end, $contextEnd - $end));
$contentTextLength += $contextEnd - $end;
// Update our last end position
$lastEnd = $contextEnd;
@ -173,7 +196,7 @@ class SearchResultsFormatter
}
// Stop if we're near our target
if (strlen($content) >= $targetLength - 10) {
if ($contentTextLength >= $targetLength - 10) {
break;
}
}
@ -181,20 +204,23 @@ class SearchResultsFormatter
// Just copy out the content if we haven't moved along anywhere.
if ($lastEnd === 0) {
$content = e(substr($originalText, 0, $targetLength));
$contentTextLength = $targetLength;
$lastEnd = $targetLength;
}
// Pad out the end if we're low
$remainder = $targetLength - strlen($content);
$remainder = $targetLength - $contentTextLength;
if ($remainder > 10) {
$content .= e(substr($originalText, $lastEnd, $remainder));
$lastEnd += $remainder;
$padEndLength = min($maxEnd - $lastEnd, $remainder);
$content .= e(substr($originalText, $lastEnd, $padEndLength));
$lastEnd += $padEndLength;
$contentTextLength += $padEndLength;
}
// Pad out the start if we're still low
$remainder = $targetLength - strlen($content);
$remainder = $targetLength - $contentTextLength;
$firstStart = $firstStart ?: 0;
if ($remainder > 10 && $firstStart !== 0) {
if (!$fetchAll && $remainder > 10 && $firstStart !== 0) {
$padStart = max(0, $firstStart - $remainder);
$content = ($padStart === 0 ? '' : '...') . e(substr($originalText, $padStart, $firstStart - $padStart)) . substr($content, 4);
}