ThinkPHP/Library/Vendor/Smarty/sysplugins/smarty_internal_parsetree.php

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<?php
/**
 * Smarty Internal Plugin Templateparser Parsetrees
 *
 * These are classes to build parsetrees in the template parser
 *
 * @package Smarty
 * @subpackage Compiler
 * @author Thue Kristensen
 * @author Uwe Tews
 */

/**
 * @package Smarty
 * @subpackage Compiler
 * @ignore
 */
abstract class _smarty_parsetree {

    /**
     * Parser object
     * @var object
     */
    public $parser;
    /**
     * Buffer content
     * @var mixed
     */
    public $data;

    /**
     * Return buffer
     *
     * @return string  buffer content
     */
    abstract public function to_smarty_php();

}

/**
 * A complete smarty tag.
 *
 * @package Smarty
 * @subpackage Compiler
 * @ignore
 */
class _smarty_tag extends _smarty_parsetree {

    /**
     * Saved block nesting level
     * @var int
     */
    public $saved_block_nesting;

    /**
     * Create parse tree buffer for Smarty tag
     *
     * @param object $parser    parser object
     * @param string $data      content
     */