[feature/sql-bool-builder] First working version

PHPBB3-13652

phpBB/phpbb/db/driver/driver.php

@@ -792,6 +792,98 @@ abstract class driver implements driver_interface
 
 		return $sql;
 	}
+	
+	
+	protected function _process_boolean_tree_first($operations_ary)
+	{
+		if ($operations_ary[0] !== 'AND' && 
+			$operations_ary[0] !== 'OR')
+		{
+			$operations_ary = array('AND', $operations_ary);
+		}
+		return $this->_process_boolean_tree($operations_ary) . "\n";
+	}
+
+	protected function _process_boolean_tree($operations_ary)
+	{
+		$operation = array_shift($operations_ary);
+		
+		foreach ($operations_ary AS &$condition)
+		{
+			switch ($condition[0])
+			{
+				case 'AND':
+				case 'OR':
+					
+					$condition = ' ( ' . $this->_process_boolean_tree($condition) . ') ';
+					
+				break;
+				case 'NOT':
+					
+					$condition = ' NOT ' . $this->_process_boolean_tree($condition);
+					
+				break;
+				
+				default:
+					
+					switch (sizeof($condition))
+					{
+						case 3:
+						
+							// Typical 3 element clause with {left hand} {operator} {right hand}
+							switch ($condition[1])
+							{	
+								case 'IN':
+								case 'NOT_IN':
+								
+									// As this is used with an IN, assume it is a set of elements for sql_in_set()
+									$condition = $this->sql_in_set($condition[0], $condition[2], $condition[1] === 'NOT_IN', true);
+									
+								break;
+								
+								default:
+								
+									$condition = implode(' ', $condition);
+									
+								break;
+							}
+							
+						break;
+						
+						case 5:
+						
+							// Subquery with {left hand} {operator} {compare kind} {SELECT Kind } {Sub Query}
+						
+							$condition = $condition[0] . ' ' . $condition[1] . ' ' . $condition[2] . ' ( ';
+							$condition .= $this->sql_build_query($condition[3], $condition[4]);
+							$condition .= ' )';
+							
+						break;
+						
+						default:
+							// This is an unpredicted clause setup. Just join all elements.
+							$condition = implode(' ', $condition);
+								
+						break;
+					}
+					
+				break;
+			}
+			
+		}
+		
+		if($operation === 'NOT')
+		{
+			$operations_ary =  implode("", $operations_ary);
+		}
+		else
+		{
+			$operations_ary = implode(" \n	$operation ", $operations_ary);
+		}
+		
+		return $operations_ary;
+	}
+	
 
 	/**
 	* {@inheritDoc}