install/includes/sql_parse.php
author Dan
Sun, 27 Jan 2008 22:57:40 -0500
changeset 378 c1c7fa6b329f
parent 348 87e08a6e4fec
child 400 7eef739a5b81
permissions -rw-r--r--
Got Enano to load even if there are no plugins; added caching for decrypted session keys to significantly improve performance (in theory at least)
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<?php
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Version 1.1.1
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 * Copyright (C) 2006-2007 Dan Fuhry
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 * Installation package
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 * sql_parse.php - SQL query splitter and templater
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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/**
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 * Parses a full file of SQL into individual queries. Also includes substitution (template) functions.
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 * @package Enano
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 * @subpackage Installer
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 * @author Dan Fuhry
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 */
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class SQL_Parser
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{
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  /**
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   * The SQL to be parsed.
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   * @var string
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   * @access private
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   */
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  private $sql_string;
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  /**
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   * Parsed SQL array
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   * @var array
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   * @access private
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   */
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  private $sql_array;
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  /**
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   * Template variables.
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   * @var array
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   * @access private
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   */
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  private $tpl_strings;
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  /**
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   * Constructor.
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   * @param string If this contains newlines, it will be treated as the target SQL. If not, will be treated as a filename.
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   */
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  public function __construct($sql)
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  {
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    if ( strpos("\n", $sql) )
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    {
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      $this->sql_string = $sql;
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    }
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    else
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    {
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      if ( file_exists($sql) )
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      {
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        $this->sql_string = @file_get_contents($sql);
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        if ( empty($this->sql_string) )
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        {
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          throw new Exception('SQL file is blank or permissions are bad');
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        }
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      }
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      else
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      {
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        throw new Exception('SQL file doesn\'t exist');
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      }
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    }
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    $this->sql_array = false;
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    $this->tpl_strings = array();
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  }
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  /**
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   * Sets template variables.
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   * @param array Associative array of template variables to assign
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   */
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  public function assign_vars($vars)
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  {
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    if ( !is_array($vars) )
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      return false;
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    $this->tpl_strings = array_merge($this->tpl_strings, $vars);
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  }
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  /**
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   * Internal function to parse the SQL.
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   * @access private
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   */
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  private function parse_sql()
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  {
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    $this->sql_array = $this->sql_string;
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    foreach ( $this->tpl_strings as $key => $value )
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    {
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      $this->sql_array = str_replace("{{{$key}}}", $value, $this->sql_array);
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    }
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    // Build an array of queries
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    $this->sql_array = explode("\n", $this->sql_array);
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    foreach ( $this->sql_array as $i => $sql )
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    {
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      $query =& $this->sql_array[$i];
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      $t = trim($query);
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      if ( empty($t) || preg_match('/^(\#|--)/i', $t) )
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      {
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        unset($this->sql_array[$i]);
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        unset($query);
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      }
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    }
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    unset($query);
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    $this->sql_array = array_values($this->sql_array);
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    $this->sql_array = implode("\n", $this->sql_array);
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    $this->sql_array = explode(";\n", $this->sql_array);
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    foreach ( $this->sql_array as $i => $sql )
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    {
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      $query =& $this->sql_array[$i];
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      if ( substr($query, ( strlen($query) - 1 ), 1 ) != ';' )
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      {
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        $query .= ';';
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      }
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    }
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    unset($query);
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  }
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  /**
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   * Returns the parsed array of SQL queries.
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   * @param bool Optional. Defaults to false. If true, a parse is performed even if it already happened.
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   * @return array
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   */
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  public function parse($force_reparse = false)
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  {
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    if ( !$this->sql_array || $force_reparse )
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      $this->parse_sql();
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Dan
parents:
diff changeset
   145
    return $this->sql_array;
87e08a6e4fec Welcome to the new Enano installer. Much distance still to be covered but the basics are there.
Dan
parents:
diff changeset
   146
  }
87e08a6e4fec Welcome to the new Enano installer. Much distance still to be covered but the basics are there.
Dan
parents:
diff changeset
   147
}
87e08a6e4fec Welcome to the new Enano installer. Much distance still to be covered but the basics are there.
Dan
parents:
diff changeset
   148
87e08a6e4fec Welcome to the new Enano installer. Much distance still to be covered but the basics are there.
Dan
parents:
diff changeset
   149
?>