new file mode 100644
--- /dev/null
+++ b/library/smarty/libs/sysplugins/smarty_internal_compilebase.php
@@ -0,0 +1,170 @@
+<?php
+/**
+ * Smarty Internal Plugin CompileBase
+ *
+ * @package    Smarty
+ * @subpackage Compiler
+ * @author     Uwe Tews
+ */
+
+/**
+ * This class does extend all internal compile plugins
+ *
+ * @package    Smarty
+ * @subpackage Compiler
+ */
+abstract class Smarty_Internal_CompileBase {
+    /**
+     * Array of names of required attribute required by tag
+     *
+     * @var array
+     */
+    public $required_attributes = array();
+    /**
+     * Array of names of optional attribute required by tag
+     * use array('_any') if there is no restriction of attributes names
+     *
+     * @var array
+     */
+    public $optional_attributes = array();
+    /**
+     * Shorttag attribute order defined by its names
+     *
+     * @var array
+     */
+    public $shorttag_order = array();
+    /**
+     * Array of names of valid option flags
+     *
+     * @var array
+     */
+    public $option_flags = array('nocache');
+
+    /**
+     * This function checks if the attributes passed are valid
+     * The attributes passed for the tag to compile are checked against the list of required and
+     * optional attributes. Required attributes must be present. Optional attributes are check against
+     * the corresponding list. The keyword '_any' specifies that any attribute will be accepted
+     * as valid
+     *
+     * @param  object $compiler compiler object
+     * @param  array $attributes attributes applied to the tag
+     *
+     * @return array  of mapped attributes for further processing
+     */
+    public function getAttributes($compiler, $attributes) {
+        $_indexed_attr = array();
+        // loop over attributes
+        foreach ($attributes as $key => $mixed) {
+            // shorthand ?
+            if (!is_array($mixed)) {
+                // option flag ?
+                if (in_array(trim($mixed, '\'"'), $this->option_flags)) {
+                    $_indexed_attr[trim($mixed, '\'"')] = true;
+                    // shorthand attribute ?
+                } elseif (isset($this->shorttag_order[$key])) {
+                    $_indexed_attr[$this->shorttag_order[$key]] = $mixed;
+                } else {
+                    // too many shorthands
+                    $compiler->trigger_template_error('too many shorthand attributes', $compiler->lex->taglineno);
+                }
+                // named attribute
+            } else {
+                $kv = each($mixed);
+                // option flag?
+                if (in_array($kv['key'], $this->option_flags)) {
+                    if (is_bool($kv['value'])) {
+                        $_indexed_attr[$kv['key']] = $kv['value'];
+                    } elseif (is_string($kv['value']) && in_array(trim($kv['value'], '\'"'), array('true', 'false'))) {
+                        if (trim($kv['value']) == 'true') {
+                            $_indexed_attr[$kv['key']] = true;
+                        } else {
+                            $_indexed_attr[$kv['key']] = false;
+                        }
+                    } elseif (is_numeric($kv['value']) && in_array($kv['value'], array(0, 1))) {
+                        if ($kv['value'] == 1) {
+                            $_indexed_attr[$kv['key']] = true;
+                        } else {
+                            $_indexed_attr[$kv['key']] = false;
+                        }
+                    } else {
+                        $compiler->trigger_template_error("illegal value of option flag \"{$kv['key']}\"", $compiler->lex->taglineno);
+                    }
+                    // must be named attribute
+                } else {
+                    reset($mixed);
+                    $_indexed_attr[key($mixed)] = $mixed[key($mixed)];
+                }
+            }
+        }
+        // check if all required attributes present
+        foreach ($this->required_attributes as $attr) {
+            if (!array_key_exists($attr, $_indexed_attr)) {
+                $compiler->trigger_template_error("missing \"" . $attr . "\" attribute", $compiler->lex->taglineno);
+            }
+        }
+        // check for not allowed attributes
+        if ($this->optional_attributes != array('_any')) {
+            $tmp_array = array_merge($this->required_attributes, $this->optional_attributes, $this->option_flags);
+            foreach ($_indexed_attr as $key => $dummy) {
+                if (!in_array($key, $tmp_array) && $key !== 0) {
+                    $compiler->trigger_template_error("unexpected \"" . $key . "\" attribute", $compiler->lex->taglineno);
+                }
+            }
+        }
+        // default 'false' for all option flags not set
+        foreach ($this->option_flags as $flag) {
+            if (!isset($_indexed_attr[$flag])) {
+                $_indexed_attr[$flag] = false;
+            }
+        }
+
+        return $_indexed_attr;
+    }
+
+    /**
+     * Push opening tag name on stack
+     * Optionally additional data can be saved on stack
+     *
+     * @param object $compiler compiler object
+     * @param string $openTag the opening tag's name
+     * @param mixed $data optional data saved
+     */
+    public function openTag($compiler, $openTag, $data = null) {
+        array_push($compiler->_tag_stack, array($openTag, $data));
+    }
+
+    /**
+     * Pop closing tag
+     * Raise an error if this stack-top doesn't match with expected opening tags
+     *
+     * @param  object $compiler compiler object
+     * @param  array|string $expectedTag the expected opening tag names
+     *
+     * @return mixed        any type the opening tag's name or saved data
+     */
+    public function closeTag($compiler, $expectedTag) {
+        if (count($compiler->_tag_stack) > 0) {
+            // get stacked info
+            list($_openTag, $_data) = array_pop($compiler->_tag_stack);
+            // open tag must match with the expected ones
+            if (in_array($_openTag, (array)$expectedTag)) {
+                if (is_null($_data)) {
+                    // return opening tag
+                    return $_openTag;
+                } else {
+                    // return restored data
+                    return $_data;
+                }
+            }
+            // wrong nesting of tags
+            $compiler->trigger_template_error("unclosed {$compiler->smarty->left_delimiter}" . $_openTag . "{$compiler->smarty->right_delimiter} tag");
+
+            return;
+        }
+        // wrong nesting of tags
+        $compiler->trigger_template_error("unexpected closing tag", $compiler->lex->taglineno);
+
+        return;
+    }
+}