Begin Refactor

vendor/gabordemooij/redbean/RedBeanPHP/Plugin/TinyQueryBuilder.php

@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * Tiny Query Builder
+ *
+ * <code>
+ * $sql = build_query([
+ * [               'SELECT * FROM book'],
+ * [$title         ,'WHERE','title = ?'],
+ * [$price         ,'AND','price < ?'],
+ * [$order         ,'ORDER BY ? ASC'],
+ * [$limit         ,'LIMIT ?']
+ * ]);
+ * </code>
+ *
+ * Now, if we have a $title and a $price the query will be:
+ * 'SELECT * FROM book WHERE title = ? AND price < ? '
+ * If we only have a $price and a $limit:
+ * 'SELECT * FROM book WHERE price < ? LIMIT ?'
+ * The Query Builder works very easy, it simply loops through the array,
+ * each element is another array inside this main array,
+ * let's call this inner array a 'piece'.
+ * A piece can have one, two or three elements.
+ * If it has one element, the element is simply concatenated to the final query.
+ * If a piece has two elements, the second element will be
+ * concatenated only if the first evaluates to TRUE.
+ * Finally a piece having three elements works the same as a piece with two elements,
+ * except that it will use the glue provided in the second element
+ * to concat the value of the third element. The glue acts as a little tube of glue.
+ * If there is still glue left in the tube (WHERE) it will preserve this
+ * until it can be applied (so the first AND will be ignored in case of a WHERE condition).
+ */
+R::ext('buildQuery', function($pieces) {
+  $sql = '';
+  $glue = NULL;
+  foreach( $pieces as $piece ) {
+    $n = count( $piece );
+    switch( $n ) {
+      case 1:
+        $sql .= " {$piece[0]} ";
+        break;
+      case 2:
+        $glue = NULL;
+        if (!is_null($piece[0])) $sql .= " {$piece[1]} ";
+        break;
+      case 3:
+        $glue = ( is_null( $glue ) ) ? $piece[1] : $glue;
+	if (!is_null($piece[0])) {
+		$sql .= " {$glue} {$piece[2]} ";
+		$glue = NULL;
+	}
+        break;
+    }
+  }
+  return $sql;
+});