silverstripe-framework/dev/Backtrace.php

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<?php
/**
* @package sapphire
* @subpackage dev
*/
class SS_Backtrace {
/**
* Return debug_backtrace() results with functions filtered
* specific to the debugging system, and not the trace.
*
* @param null|array $ignoredFunctions If an array, filter these functions out of the trace
* @return array
*/
static function filtered_backtrace($ignoredFunctions = null) {
return self::filter_backtrace(debug_backtrace(), $ignoredFunctions);
}
/**
* Filter a backtrace so that it doesn't show the calls to the
* debugging system, which is useless information.
*
* @param array $bt Backtrace to filter
* @param null|array $ignoredFunctions List of extra functions to filter out
* @return array
*/
static function filter_backtrace($bt, $ignoredFunctions = null) {
$defaultIgnoredFunctions = array(
'SS_Log::log',
'SS_Backtrace::backtrace',
'SS_Backtrace::filtered_backtrace',
'Zend_Log_Writer_Abstract->write',
'Zend_Log->log',
'Zend_Log->__call',
'Zend_Log->err',
'DebugView->writeTrace',
'CliDebugView->writeTrace',
'Debug::emailError',
'Debug::warningHandler',
'Debug::noticeHandler',
'Debug::fatalHandler',
'errorHandler',
'Debug::showError',
'Debug::backtrace',
'exceptionHandler'
);
if($ignoredFunctions) foreach($ignoredFunctions as $ignoredFunction) {
$defaultIgnoredFunctions[] = $ignoredFunction;
}
while($bt && in_array(self::full_func_name($bt[0]), $defaultIgnoredFunctions)) {
array_shift($bt);
}
return $bt;
}
/**
* Render or return a backtrace from the given scope.
*
* @param unknown_type $returnVal
* @param unknown_type $ignoreAjax
* @return unknown
*/
static function backtrace($returnVal = false, $ignoreAjax = false, $ignoredFunctions = null) {
$plainText = Director::is_cli() || (Director::is_ajax() && !$ignoreAjax);
$result = self::get_rendered_backtrace(debug_backtrace(), $plainText, $ignoredFunctions);
if($returnVal) {
return $result;
} else {
echo $result;
}
}
/**
* Return the full function name. If showArgs is set to true, a string representation of the arguments will be shown
*
* @param Object $item
* @param boolean $showArg
* @param Int $argCharLimit
* @return String
*/
static function full_func_name($item, $showArgs = false, $argCharLimit = 10000) {
$funcName = '';
if(isset($item['class'])) $funcName .= $item['class'];
if(isset($item['type'])) $funcName .= $item['type'];
if(isset($item['function'])) $funcName .= $item['function'];
if($showArgs && isset($item['args'])) {
$args = array();
foreach($item['args'] as $arg) {
if(!is_object($arg) || method_exists($arg, '__toString')) {
$args[] = (strlen((string)$arg) > $argCharLimit) ? substr((string)$arg, 0, $argCharLimit) . '...' : (string)$arg;
} else {
$args[] = get_class($arg);
}
}
$funcName .= "(" . implode(",", $args) .")";
}
return $funcName;
}
/**
* Render a backtrace array into an appropriate plain-text or HTML string.
*
* @param string $bt The trace array, as returned by debug_backtrace() or Exception::getTrace()
* @param boolean $plainText Set to false for HTML output, or true for plain-text output
* @param array List of functions that should be ignored. If not set, a default is provided
* @return string The rendered backtrace
*/
static function get_rendered_backtrace($bt, $plainText = false, $ignoredFunctions = null) {
$bt = self::filter_backtrace($bt, $ignoredFunctions);
$result = "<ul>";
foreach($bt as $item) {
if($plainText) {
$result .= self::full_func_name($item,true) . "\n";
if(isset($item['line']) && isset($item['file'])) $result .= "line $item[line] of " . basename($item['file']) . "\n";
$result .= "\n";
} else {
if ($item['function'] == 'user_error') {
$name = $item['args'][0];
} else {
$name = self::full_func_name($item,true);
}
$result .= "<li><b>" . htmlentities($name, ENT_COMPAT, 'UTF-8') . "</b>\n<br />\n";
$result .= isset($item['line']) ? "Line $item[line] of " : '';
$result .= isset($item['file']) ? htmlentities(basename($item['file'])) : '';
$result .= "</li>\n";
}
}
$result .= "</ul>";
return $result;
}
}