silverstripe-dms/code/tools/ShortCodeRelationFinder.php

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<?php
/**
* Finds {@link DataObject} instances using certain shortcodes
* by fulltext-querying only fields which are capable of parsing shortcodes.
* Effectively the reverse of "link tracking",
* which updates this relation on write rather than fetching it on demand.
*
* Doesn't scale to millions of pages due to triggering a potentially unindexed LIKE
* search across dozens of columns and tables - but for a couple of hundred pages
* and occasionally use its a feasible solution.
*/
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class ShortCodeRelationFinder
{
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/**
* @var String Regex matching a {@link DBField} class name which is shortcode capable.
*
* This should really look for implementors of a ShortCodeParseable interface,
* but we can't extend the core Text and HTMLText class
* on existing like SiteTree.Content for this.
*/
protected $fieldSpecRegex = '/^(HTMLText)/';
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/**
* @param String Shortcode index number to find
* @return array IDs
*/
public function findPageIDs($number)
{
$list = $this->getList($number);
$found = $list->column();
return $found;
}
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public function findPageCount($number)
{
$list = $this->getList($number);
return $list->count();
}
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/**
* @return DataList
*/
public function getList($number)
{
$list = DataList::create('SiteTree');
$where = array();
$fields = $this->getShortCodeFields('SiteTree');
$shortcode = DMS::inst()->getShortcodeHandlerKey();
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foreach ($fields as $ancClass => $ancFields) {
foreach ($ancFields as $ancFieldName => $ancFieldSpec) {
if ($ancClass != "SiteTree") {
$list = $list->leftJoin($ancClass, '"'.$ancClass.'"."ID" = "SiteTree"."ID"');
}
$where[] = "\"$ancClass\".\"$ancFieldName\" LIKE '%[{$shortcode},id=$number]%'"; //."%s" LIKE ""',
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}
}
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$list = $list->where(implode(' OR ', $where));
return $list;
}
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/**
* Returns a filtered list of fields which could contain shortcodes.
*
* @param String
* @return Array Map of class names to an array of field names on these classes.
*/
public function getShortcodeFields($class)
{
$fields = array();
$ancestry = array_values(ClassInfo::dataClassesFor($class));
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foreach ($ancestry as $ancestor) {
if (ClassInfo::classImplements($ancestor, 'TestOnly')) {
continue;
}
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$ancFields = DataObject::custom_database_fields($ancestor);
if ($ancFields) {
foreach ($ancFields as $ancFieldName => $ancFieldSpec) {
if (preg_match($this->fieldSpecRegex, $ancFieldSpec)) {
if (!@$fields[$ancestor]) {
$fields[$ancestor] = array();
}
$fields[$ancestor][$ancFieldName] = $ancFieldSpec;
}
}
}
}
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return $fields;
}
}