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<?php
/**
* Format a SQL Query for better readable output in HTML or Plaintext.
* Its a simple string parser, not a full tokenizer - so formatting
* is not aware of the SQL syntax. This means we have to be conservative
* with modifying the SQL string.
*
* @package framework
* @subpackage parsers
* @author Ingo Schommer, Silverstripe Ltd. (<firstname>@silverstripe.com)
*/
class SQLFormatter extends Object {
protected static $newline_before_tokens = array(
'SELECT',
'UPDATE',
'INSERT',
'DELETE',
'FROM',
'INNER JOIN',
'FULL JOIN',
'LEFT JOIN',
'RIGHT JOIN',
'WHERE',
'ORDER BY',
'GROUP BY',
'LIMIT',
);
public function formatPlain($sql) {
$sql = $this->addNewlines($sql, false);
return $sql;
}
public function formatHTML($sql) {
$sql = $this->addNewlines($sql, true);
return $sql;
}
/**
* Newlines for tokens defined in $newline_before_tokens.
* Case-sensitive, only applies to uppercase SQL to avoid
* messing with possible content fragments in the query.
*/
protected function addNewlines($sql, $useHtmlFormatting = false) {
$eol = PHP_EOL;
foreach(self::$newline_before_tokens as $token) {
$breakToken = ($useHtmlFormatting) ? "<br />$eol" : $eol;
$sql = preg_replace('/[^\n](' . $token . ')/', $breakToken . '$1', $sql);
}
return $sql;
}
}
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