prefix & substitution support (0.6c)

dibi/libs/driver.php

@@ -34,6 +34,13 @@ abstract class DibiDriver
     protected
         $config;
 
+    /**
+     * Substitutions for identifiers
+     * @var array
+     */
+    protected
+        $substs = array();
+
     /**
      * Describes how convert some datatypes to SQL command
      * @var array
@@ -153,6 +160,45 @@ abstract class DibiDriver
 
 
 
+    /**
+     * Create a new substitution pair for indentifiers
+     * @param string from
+     * @param string to
+     * @return void
+     */
+    public function addSubst($expr, $subst)
+    {
+        $this->substs[':'.$expr.':'] = $subst;
+    }
+
+
+    /**
+     * Remove substitution pair
+     * @param string from
+     * @return void
+     */
+    public function removeSubst($expr)
+    {
+        unset($this->substs[':'.$expr.':']);
+    }
+
+
+    /**
+     * Apply substitutions to indentifier
+     * @param string indentifier
+     * @return string
+     */
+    protected function applySubsts($value)
+    {
+        // apply substitutions
+        if ($this->substs && (strpos($value, ':') !== FALSE))
+            return strtr($value, $this->substs);
+
+        return $value;
+    }
+
+
+
 } // class DibiDriver