More work on the query parser

common/framework/parsers/dbquery/variablebase.php

@@ -0,0 +1,76 @@
+<?php
+
+namespace Rhymix\Framework\Parsers\DBQuery;
+
+/**
+ * VariableBase class.
+ */
+class VariableBase
+{
+	/**
+	 * Instance properties.
+	 */
+	public $var;
+	public $default;
+	
+	/**
+	 * Get the value of this variable.
+	 * 
+	 * @return Expression
+	 */
+	public function getValue(): Expression
+	{
+		if ($this->var)
+		{
+			return new Expression('var', $this->var);
+		}
+		else
+		{
+			return $this->getDefaultValue();
+		}
+	}
+	
+	/**
+	 * Get the default value of this variable.
+	 * 
+	 * @return Expression
+	 */
+	public function getDefaultValue(): Expression
+	{
+		// If the default value is not set, return null.
+		$val = $this->default;
+		if ($val === null)
+		{
+			return new Expression('null');
+		}
+		
+		// If the default value is a function shortcut, return an appropriate value.
+		switch ($val)
+		{
+			case 'ipaddress()':
+				return new Expression('string', \RX_CLIENT_IP);
+			case 'unixtime()':
+				return new Expression('string', time());
+			case 'curdate()':
+			case 'date()':
+				return new Expression('string', date('YmdHis'));
+			case 'sequence()':
+				return new Expression('int', getNextSequence());
+		}
+		
+		// If the default value is a calculation based on the current value, return a query string.
+		if (isset($this->column) && preg_match('/^(plus|minus|multiply)\(([0-9]+)\)$/', $val, $matches))
+		{
+			
+		}
+		
+		// If the default value is a column name, return the column name.20
+		if (\Rhymix\Framework\Parsers\DBQueryParser::isValidColumnName($val))
+		{
+			
+		}
+		
+		// Otherwise, return the literal value.
+		return new Expression('string', $val);
+	}
+}