/**
* Remove parts of a SQL string that contain quoted strings
* of values or identifiers.
*
* @param string $sql
* @return string
*/
protected function _stripQuoted($sql)
{
// get the character for value quoting
// this should be '
$q = $this->_adapter->quote('a');
$q = $q[0];
// get the value used as an escaped quote,
// e.g. \' or ''
$qe = $this->_adapter->quote($q);
$qe = substr($qe, 1, 2);
$qe = preg_quote($qe);
$escapeChar = substr($qe, 0, 1);
// remove 'foo\'bar'
if (!empty($q)) {
$escapeChar = preg_quote($escapeChar);
// this segfaults only after 65,000 characters instead of 9,000
$sql = preg_replace("/{$q}([^{$q}{$escapeChar}]*|({$qe})*)*{$q}/s", '', $sql);
}
// get a version of the SQL statement with all quoted
// values and delimited identifiers stripped out
// remove "foo\"bar"
$sql = preg_replace("/\"(\\\\\"|[^\"])*\"/Us", '', $sql);
// get the character for delimited id quotes,
// this is usually " but in MySQL is `
$d = $this->_adapter->quoteIdentifier('a');
$d = $d[0];
// get the value used as an escaped delimited id quote,
// e.g. \" or "" or \`
$de = $this->_adapter->quoteIdentifier($d);
$de = substr($de, 1, 2);
$de = preg_quote($de);
// Note: $de and $d where never used..., now they are:
$sql = preg_replace("/{$d}({$de}|\\\\{2}|[^{$d}])*{$d}/Us", '', $sql);
return $sql;
}
