*/
class SyntaxExtension extends \Twig_Extension
{
public function getFilters()
{
return [
new \Twig_SimpleFilter('format_sql', [$this, 'formatSQL'], ['is_safe' => ['html']]),
new \Twig_SimpleFilter('format_memory', [$this, 'formatMemory']),
];
}
public function getName()
{
return 'propel_syntax_extension';
}
/**
* Format a byte count into a human-readable representation.
*
* @param integer $bytes Byte count to convert. Can be negative.
* @param integer $precision How many decimals to include.
*
* @return string
*/
public function formatMemory($bytes, $precision = 3)
{
$absBytes = abs($bytes);
$sign = ($bytes == $absBytes) ? 1 : -1;
$suffix = array('B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB');
$total = count($suffix);
for ($i = 0; $absBytes > 1024 && $i < $total; $i++) {
$absBytes /= 1024;
}
return self::toPrecision($sign * $absBytes, $precision).' '.$suffix[$i];
}
public function formatSQL($sql)
{
// list of keywords to prepend a newline in output
$newlines = array(
'FROM',
'(((FULL|LEFT|RIGHT)? ?(OUTER|INNER)?|CROSS|NATURAL)? JOIN)',
'VALUES',
'WHERE',
'ORDER BY',
'GROUP BY',
'HAVING',
'LIMIT',
);
// list of keywords to highlight
$keywords = array_merge($newlines, array(
// base
'SELECT', 'UPDATE', 'DELETE', 'INSERT', 'REPLACE',
'SET',
'INTO',
'AS',
'DISTINCT',
// most used methods
'COUNT',
'AVG',
'MIN',
'MAX',
// joins
'ON', 'USING',
// where clause
'(IS (NOT)?)?NULL',
'(NOT )?IN',
'(NOT )?I?LIKE',
'AND', 'OR', 'XOR',
'BETWEEN',
// order, group, limit ..
'ASC',
'DESC',
'OFFSET',
));
$sql = preg_replace(array(
'/\b('.implode('|', $newlines).')\b/',
'/\b('.implode('|', $keywords).')\b/',
'/(\/\*.*\*\/)/',
'/(`[^`.]*`)/',
'/(([0-9a-zA-Z$_]+)\.([0-9a-zA-Z$_]+))/',
), array(
'
\\1',
'\\1',
'',
'\\1',
'\\1',
), $sql);
return $sql;
}
/**
* Rounding to significant digits (sort of like JavaScript's toPrecision()).
*
* @param float $number Value to round
* @param integer $significantFigures Number of significant figures
*
* @return float
*/
public static function toPrecision($number, $significantFigures = 3)
{
if (0 === $number) {
return 0;
}
$significantDecimals = floor($significantFigures - log10(abs($number)));
$magnitude = pow(10, $significantDecimals);
$shifted = round($number * $magnitude);
return number_format($shifted / $magnitude, $significantDecimals);
}
}