New search engine (#4378)

* New possibility to invoke user queries from a search expression
From the search field: `S:"My query"`.
Can be combined with other filters such as `S:"My query" date:P3d` as long as the user queries do not contain `OR`.
A use-case is to have an RSS filter with a stable address or an external API call with the ability to update the user query.

* Draft of parenthesis logic

* More draft

* Working parenthesis (a OR b) (c OR d)

* Working (A) OR (B)

* Support nested parentheses + unit tests + documentation

* search:MySearch and S:3

1 files changed, 4 insertions, 4 deletions

diff --git a/app/Models/EntryDAOPGSQL.php b/app/Models/EntryDAOPGSQL.php
index b97417a7c..13bf8b41f 100644
--- a/app/Models/EntryDAOPGSQL.php
+++ b/app/Models/EntryDAOPGSQL.php
@@ -2,19 +2,19 @@
 
 class FreshRSS_EntryDAOPGSQL extends FreshRSS_EntryDAOSQLite {
 
-	public function hasNativeHex(): bool {
+	public static function hasNativeHex(): bool {
 		return true;
 	}
 
-	public function sqlHexDecode(string $x): string {
+	public static function sqlHexDecode(string $x): string {
 		return 'decode(' . $x . ", 'hex')";
 	}
 
-	public function sqlHexEncode(string $x): string {
+	public static function sqlHexEncode(string $x): string {
 		return 'encode(' . $x . ", 'hex')";
 	}
 
-	public function sqlIgnoreConflict(string $sql): string {
+	public static function sqlIgnoreConflict(string $sql): string {
 		return rtrim($sql, ' ;') . ' ON CONFLICT DO NOTHING';
 	}