public static function substVars($val, $props = null)
{
$sbuf = '';
$i = 0;
while (true) {
$j = strpos($val, self::DELIM_START, $i);
if ($j === false) {
// no more variables
if ($i == 0) {
// this is a simple string
return $val;
} else {
// add the tail string which contails no variables and return the result.
$sbuf .= substr($val, $i);
return $sbuf;
}
} else {
$sbuf .= substr($val, $i, $j - $i);
$k = strpos($val, self::DELIM_STOP, $j);
if ($k === false) {
// LoggerOptionConverter::substVars() has no closing brace. Opening brace
return '';
} else {
$j += self::DELIM_START_LEN;
$key = substr($val, $j, $k - $j);
// first try in System properties
$replacement = Payone_Log4php_LoggerOptionConverter::getSystemProperty($key, null);
// then try props parameter
if ($replacement == null and $props !== null) {
$replacement = @$props[$key];
}
if (!empty($replacement)) {
// Do variable substitution on the replacement string
// such that we can solve "Hello ${x2}" as "Hello p1"
// the where the properties are
// x1=p1
// x2=${x1}
$recursiveReplacement = Payone_Log4php_LoggerOptionConverter::substVars($replacement, $props);
$sbuf .= $recursiveReplacement;
}
$i = $k + self::DELIM_STOP_LEN;
}
}
}
}
