includes/sql_parse.php
author Dan
Thu, 20 Aug 2009 21:15:19 -0400
changeset 1084 742cb0f10766
parent 1081 745200a9cc2a
child 1227 bdac73ed481e
permissions -rw-r--r--
Sessions: whoops, left a debug message in by accident, broke a few redirects
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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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 * Copyright (C) 2006-2009 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 $tpl_strings;
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  /**
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   * Constructor.
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   * @param string If this contains newlines, it will be treated as the target SQL. If not, will be treated as a filename.
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   * @param string If true, force as raw SQL, i.e. don't treat as a filename no matter what
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   */
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  public function __construct($sql, $force_file = false)
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  {
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    if ( strpos($sql, "\n") || $force_file )
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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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    // convert \r\n in the schema to \n, in case some FTP client or zip utility ran unix2dos for us
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    // thanks to InvisGhost for reporting this error
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    $this->sql_string = str_replace("\r\n", "\n", $this->sql_string);
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  }
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  /**
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   * Sets template variables.
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   * @param array Associative array of template variables to assign
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   */
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  public function assign_vars($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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    // Strip out comments
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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 ( 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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    $this->sql_array = explode(";\n", trim($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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      $query = trim($query);
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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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    return $this->sql_array;
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  }
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}
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