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<?php |
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namespace PolderKnowledge\LogModule\Formatter; |
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class ExceptionPrinter |
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{ |
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public static function linesFromException(\Throwable $exception, bool $nested = false): array |
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{ |
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$lines = []; |
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$lines[] = self::printFirstLineFromException($exception, $nested); |
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foreach ($exception->getTrace() as $traceLine) { |
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$lines[] = self::formatTraceLine($traceLine); |
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} |
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if ($exception->getPrevious()) { |
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$previousLines = self::linesFromException($exception->getPrevious(), true); |
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// recursion makes sure deeper nesting has longer prefixes |
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foreach ($previousLines as $previousLine) { |
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$lines[] = ' ' . $previousLine; |
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} |
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} |
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return $lines; |
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} |
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public static function printFirstLineFromException(\Throwable $exception, bool $nested): string |
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{ |
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return sprintf('[%s] %s: %s in %s:%s', ...[ |
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// only the root exception has a timestamp |
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$nested ? 'Previous Exception' : date('r'), |
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get_class($exception), |
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$exception->getMessage(), |
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$exception->getFile(), |
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$exception->getLine() |
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]); |
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} |
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/** |
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* Transform an element of the array Exception::getTrace |
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* to a string of a single line |
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* |
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* @param mixed[] $trace element of Exception::getTrace |
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* @return string of a single line |
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*/ |
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public static function formatTraceLine(array $trace): string |
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{ |
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$output = ''; |
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// only display file if we're not in the context of a class |
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// to save space for the sake for readability of the stack trace |
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if (isset($trace['file']) && !isset($trace['class'])) { |
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$output .= $trace['file']; |
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if (isset($trace['line'])) { |
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$output .= '(' . $trace['line'] . ')'; |
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} |
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if (!isset($trace['function'])) { |
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return $output; |
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} |
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} |
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$output .= $trace['class'] ?? ''; |
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$output .= $trace['type'] ?? ''; |
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$output .= $trace['function'] ?? ''; |
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if (isset($trace['function'])) { |
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$arguments = self::formatArguments($trace['args'] ?? []); |
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$output .= '(' . $arguments . ')'; |
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} |
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// print line number now if we skipped it |
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if (isset($trace['class']) && isset($trace['line'])) { |
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$output .= ':' . $trace['line']; |
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} |
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return $output; |
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} |
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/** |
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* Convert function arguments of any type to a short readable string |
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* |
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* @param mixed[] $arguments |
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* @return string a summary of the list of arguments |
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*/ |
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public static function formatArguments(array $arguments): string |
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{ |
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return implode(', ', array_map([__CLASS__, 'formatArgument'], $arguments)); |
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} |
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/** |
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* Summarize a variable |
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* |
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* @param mixed $argument anything at all |
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* @return string a summary of the argument |
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*/ |
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public static function formatArgument($argument): string |
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{ |
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if (is_object($argument)) { |
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return get_class($argument); |
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} |
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if (is_int($argument) || is_float($argument)) { |
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return $argument; |
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} |
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if (is_string($argument)) { |
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return self::truncateString($argument); |
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} |
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if ($argument === false) { |
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return 'false'; |
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} |
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if ($argument === true) { |
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return 'true'; |
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} |
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if (is_array($argument)) { |
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return 'array(' . count($argument) . ')'; |
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} |
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// resource or null |
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return gettype($argument); |
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} |
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public static function truncateString(string $argument): string |
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{ |
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if (strlen($argument) < 80) { |
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$truncated = $argument; |
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} else { |
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$truncated = substr($argument, 0, 30) . '...' . substr($argument, -30, 30); |
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} |
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return "'$truncated'"; |
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} |
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} |
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polderknowledge /
log-module
