moodle/lib/adodb/drivers/adodb-text.inc.php

<?php
/*
@version   v5.20.9  21-Dec-2016
@copyright (c) 2000-2013 John Lim (jlim#natsoft.com). All rights reserved.
@copyright (c) 2014      Damien Regad, Mark Newnham and the ADOdb community
   Set tabs to 4.
*/

/*
Setup:

 	$db = NewADOConnection('text');
 	$db->Connect($array,[$types],[$colnames]);

	Parameter $array is the 2 dimensional array of data. The first row can contain the
	column names. If column names is not defined in first row, you MUST define $colnames,
	the 3rd parameter.

	Parameter $types is optional. If defined, it should contain an array matching
	the number of columns in $array, with each element matching the correct type defined
	by MetaType: (B,C,I,L,N). If undefined, we will probe for $this->_proberows rows
	to guess the type. Only C,I and N are recognised.

	Parameter $colnames is optional. If defined, it is an array that contains the
	column names of $array. If undefined, we assume the first row of $array holds the
	column names.

 The Execute() function will return a recordset. The recordset works like a normal recordset.
 We have partial support for SQL parsing. We process the SQL using the following rules:

 1. SQL order by's always work for the first column ordered. Subsequent cols are ignored

 2. All operations take place on the same table. No joins possible. In fact the FROM clause
	is ignored! You can use any name for the table.

 3. To simplify code, all columns are returned, except when selecting 1 column

 	$rs = $db->Execute('select col1,col2 from table'); // sql ignored, will generate all cols

	We special case handling of 1 column because it is used in filter popups

	$rs = $db->Execute('select col1 from table');
	// sql accepted and processed -- any table name is accepted

	$rs = $db->Execute('select distinct col1 from table');
	// sql accepted and processed

4. Where clauses are ignored, but searching with the 3rd parameter of Execute is permitted.
   This has to use PHP syntax and we will eval() it. You can even use PHP functions.

	 $rs = $db->Execute('select * from table',false,"\$COL1='abc' and $\COL2=3")
 	// the 3rd param is searched -- make sure that $COL1 is a legal column name
	// and all column names must be in upper case.

4. Group by, having, other clauses are ignored

5. Expression columns, min(), max() are ignored

6. All data is readonly. Only SELECTs permitted.
*/

// security - hide paths
if (!defined('ADODB_DIR')) die();

if (! defined("_ADODB_TEXT_LAYER")) {
 define("_ADODB_TEXT_LAYER", 1 );

// for sorting in _query()
function adodb_cmp($a, $b) {
	if ($a[0] == $b[0]) return 0;
	return ($a[0] < $b[0]) ? -1 : 1;
}
// for sorting in _query()
function adodb_cmpr($a, $b) {
	if ($a[0] == $b[0]) return 0;
	return ($a[0] > $b[0]) ? -1 : 1;
}
class ADODB_text extends ADOConnection {
	var $databaseType = 'text';

	var $_origarray; // original data
	var $_types;
	var $_proberows = 8;
	var $_colnames;
	var $_skiprow1=false;
	var $readOnly = true;
	var $hasTransactions = false;

	var $_rezarray;
	var $_reznames;
	var $_reztypes;

	function __construct()
	{
	}

	function RSRecordCount()
	{
		if (!empty($this->_rezarray)) return sizeof($this->_rezarray);

		return sizeof($this->_origarray);
	}

	function _insertid()
	{
			return false;
	}

	function _affectedrows()
	{
			return false;
	}

		// returns true or false
	function PConnect(&$array, $types = false, $colnames = false)
	{
		return $this->Connect($array, $types, $colnames);
	}
		// returns true or false
	function Connect(&$array, $types = false, $colnames = false)
	{
		if (is_string($array) and $array === 'iluvphplens') return 'me2';

		if (!$array) {
			$this->_origarray = false;
			return true;
		}
		$row = $array[0];
		$cols = sizeof($row);


		if ($colnames) $this->_colnames = $colnames;
		else {
			$this->_colnames = $array[0];
			$this->_skiprow1 = true;
		}
		if (!$types) {
		// probe and guess the type
			$types = array();
			$firstrow = true;
			if ($this->_proberows > sizeof($array)) $max = sizeof($array);
			else $max = $this->_proberows;
			for ($j=($this->_skiprow1)?1:0;$j < $max; $j++) {
				$row = $array[$j];
				if (!$row) break;
				$i = -1;
				foreach($row as $v) {
					$i += 1;
					//print " ($i ".$types[$i]. "$v) ";
					$v = trim($v);
	 				if (!preg_match('/^[+-]{0,1}[0-9\.]+$/',$v)) {
						$types[$i] = 'C'; // once C, always C
						continue;
					}
					if (isset($types[$i]) && $types[$i]=='C') continue;
					if ($firstrow) {
					// If empty string, we presume is character
					// test for integer for 1st row only
					// after that it is up to testing other rows to prove
					// that it is not an integer
						if (strlen($v) == 0) $types[0] = 'C';
						if (strpos($v,'.') !== false) $types[0] = 'N';
						else  $types[$i] = 'I';
						continue;
					}

					if (strpos($v,'.') !== false) $types[$i] = 'N';

				}
				$firstrow = false;
			}
		}
		//print_r($types);
		$this->_origarray = $array;
		$this->_types = $types;
		return true;
	}



	// returns queryID or false
	// We presume that the select statement is on the same table (what else?),
	// with the only difference being the order by.
	//You can filter by using $eval and each clause is stored in $arr .eg. $arr[1] == 'name'
	// also supports SELECT [DISTINCT] COL FROM ... -- only 1 col supported
	function _query($sql,$input_arr,$eval=false)
	{
		if ($this->_origarray === false) return false;

		$eval = $this->evalAll;
		$usql = strtoupper(trim($sql));
		$usql = preg_replace("/[\t\n\r]/",' ',$usql);
		$usql = preg_replace('/ *BY/i',' BY',strtoupper($usql));

		$eregword ='([A-Z_0-9]*)';
		//print "<BR> $sql $eval ";
		if ($eval) {
			$i = 0;
			foreach($this->_colnames as $n) {
				$n = strtoupper(trim($n));
				$eval = str_replace("\$$n","\$arr[$i]",$eval);

				$i += 1;
			}

			$i = 0;
			$eval = "\$rez=($eval);";
			//print "<p>Eval string = $eval </p>";
			$where_arr = array();

			reset($this->_origarray);
			foreach ($this->_origarray as $arr) {

				if ($i == 0 && $this->_skiprow1)
					$where_arr[] = $arr;
				else {
					eval($eval);
					//print " $i: result=$rez arr[0]={$arr[0]} arr[1]={$arr[1]} <BR>\n ";
					if ($rez) $where_arr[] = $arr;
				}
				$i += 1;
			}
			$this->_rezarray = $where_arr;
		}else
			$where_arr = $this->_origarray;

		// THIS PROJECTION CODE ONLY WORKS FOR 1 COLUMN,
		// OTHERWISE IT RETURNS ALL COLUMNS
		if (substr($usql,0,7) == 'SELECT ') {
			$at = strpos($usql,' FROM ');
			$sel = trim(substr($usql,7,$at-7));

			$distinct = false;
			if (substr($sel,0,8) == 'DISTINCT') {
				$distinct = true;
				$sel = trim(substr($sel,8,$at));
			}

			// $sel holds the selection clause, comma delimited
			// currently we only project if one column is involved
			// this is to support popups in PHPLens
			if (strpos(',',$sel)===false) {
				$colarr = array();

				preg_match("/$eregword/",$sel,$colarr);
				$col = $colarr[1];
				$i = 0;
				$n = '';
				reset($this->_colnames);
				foreach ($this->_colnames as $n) {

					if ($col == strtoupper(trim($n))) break;
					$i += 1;
				}

				if ($n && $col) {
					$distarr = array();
					$projarray = array();
					$projtypes = array($this->_types[$i]);
					$projnames = array($n);

					reset($where_arr);
					while (list($k_a,$a) = each($where_arr)) {
						if ($i == 0 && $this->_skiprow1) {
							$projarray[] = array($n);
							continue;
						}

						if ($distinct) {
							$v = strtoupper($a[$i]);
							if (! $distarr[$v]) {
								$projarray[] = array($a[$i]);
								$distarr[$v] = 1;
							}
						} else
							$projarray[] = array($a[$i]);

					} //foreach
					//print_r($projarray);
				}
			} // check 1 column in projection
		}  // is SELECT

		if (empty($projarray)) {
			$projtypes = $this->_types;
			$projarray = $where_arr;
			$projnames = $this->_colnames;
		}
		$this->_rezarray = $projarray;
		$this->_reztypes = $projtypes;
		$this->_reznames = $projnames;


		$pos = strpos($usql,' ORDER BY ');
		if ($pos === false) return $this;
		$orderby = trim(substr($usql,$pos+10));

		preg_match("/$eregword/",$orderby,$arr);
		if (sizeof($arr) < 2) return $this; // actually invalid sql
		$col = $arr[1];
		$at = (integer) $col;
		if ($at == 0) {
			$i = 0;
			reset($projnames);
			foreach ($projnames as $n) {
				if (strtoupper(trim($n)) == $col) {
					$at = $i+1;
					break;
				}
				$i += 1;
			}
		}

		if ($at <= 0 || $at > sizeof($projarray[0])) return $this; // cannot find sort column
		$at -= 1;

		// generate sort array consisting of (sortval1, row index1) (sortval2, row index2)...
		$sorta = array();
		$t = $projtypes[$at];
		$num = ($t == 'I' || $t == 'N');
		for ($i=($this->_skiprow1)?1:0, $max = sizeof($projarray); $i < $max; $i++) {
			$row = $projarray[$i];
			$val = ($num)?(float)$row[$at]:$row[$at];
			$sorta[]=array($val,$i);
		}

		// check for desc sort
		$orderby = substr($orderby,strlen($col)+1);
		$arr == array();
		preg_match('/([A-Z_0-9]*)/i',$orderby,$arr);

		if (trim($arr[1]) == 'DESC') $sortf = 'adodb_cmpr';
		else $sortf = 'adodb_cmp';

		// hasta la sorta babe
		usort($sorta, $sortf);

		// rearrange original array
		$arr2 = array();
		if ($this->_skiprow1) $arr2[] = $projarray[0];
		foreach($sorta as $v) {
			$arr2[] = $projarray[$v[1]];
		}

		$this->_rezarray = $arr2;
		return $this;
	}

	/*	Returns: the last error message from previous database operation	*/
	function ErrorMsg()
	{
			return '';
	}

	/*	Returns: the last error number from previous database operation	*/
	function ErrorNo()
	{
		return 0;
	}

	// returns true or false
	function _close()
	{
	}


}

/*--------------------------------------------------------------------------------------
	 Class Name: Recordset
--------------------------------------------------------------------------------------*/


class ADORecordSet_text extends ADORecordSet_array
{

	var $databaseType = "text";

	function __construct(&$conn,$mode=false)
	{
		parent::__construct();
		$this->InitArray($conn->_rezarray,$conn->_reztypes,$conn->_reznames);
		$conn->_rezarray = false;
	}

} // class ADORecordSet_text


} // defined