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
$replacement = LoggerOptionConverter::getSystemProperty($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}
$recursiveReplacement = LoggerOptionConverter::substVars($replacement, $props);
$sbuf .= $recursiveReplacement;
}
$i = $k + self::DELIM_STOP_LEN;
}
}
}
}
/**
* Perform variable substitution in string <var>$val</var> from the
* values of keys found with the {@link getSystemProperty()} method.
*
* <p>The variable substitution delimeters are <b>${</b> and <b>}</b>.
*
* <p>For example, if the "MY_CONSTANT" contains "value", then
* the call
* <code>
* $s = LoggerOptionConverter::substituteVars("Value of key is ${MY_CONSTANT}.");
* </code>
* will set the variable <i>$s</i> to "Value of key is value.".</p>
*
* <p>If no value could be found for the specified key, then the
* <var>$props</var> parameter is searched, if the value could not
* be found there, then substitution defaults to the empty string.</p>
*
* <p>For example, if {@link getSystemProperty()} cannot find any value for the key
* "inexistentKey", then the call
* <code>
* $s = LoggerOptionConverter::substVars("Value of inexistentKey is [${inexistentKey}]");
* </code>
* will set <var>$s</var> to "Value of inexistentKey is []".</p>
*
* <p>A warn is thrown if <var>$val</var> contains a start delimeter "${"
* which is not balanced by a stop delimeter "}" and an empty string is returned.</p>
*
* @log4j-author Avy Sharell
*
* @param string $val The string on which variable substitution is performed.
* @param array $props
* @return string
*
* @static
*/
function substVars($val, $props = null)
{
LoggerLog::debug("LoggerOptionConverter::substVars():val=[{$val}]");
$sbuf = '';
$i = 0;
while (true) {
$j = strpos($val, LOG4PHP_OPTION_CONVERTER_DELIM_START, $i);
if ($j === false) {
LoggerLog::debug("LoggerOptionConverter::substVars() no more variables");
// no more variables
if ($i == 0) {
// this is a simple string
LoggerLog::debug("LoggerOptionConverter::substVars() simple string");
return $val;
} else {
// add the tail string which contails no variables and return the result.
$sbuf .= substr($val, $i);
LoggerLog::debug("LoggerOptionConverter::substVars():sbuf=[{$sbuf}]. Returning sbuf");
return $sbuf;
}
} else {
$sbuf .= substr($val, $i, $j - $i);
LoggerLog::debug("LoggerOptionConverter::substVars():sbuf=[{$sbuf}]:i={$i}:j={$j}.");
$k = strpos($val, LOG4PHP_OPTION_CONVERTER_DELIM_STOP, $j);
if ($k === false) {
LoggerLog::warn("LoggerOptionConverter::substVars() " . "'{$val}' has no closing brace. Opening brace at position {$j}.");
return '';
} else {
$j += LOG4PHP_OPTION_CONVERTER_DELIM_START_LEN;
$key = substr($val, $j, $k - $j);
// first try in System properties
$replacement = LoggerOptionConverter::getSystemProperty($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}
$recursiveReplacement = LoggerOptionConverter::substVars($replacement, $props);
$sbuf .= $recursiveReplacement;
}
$i = $k + LOG4PHP_OPTION_CONVERTER_DELIM_STOP_LEN;
}
}
}
}
