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python style exception trace for PHP
static function python_like_exception(
Throwable $e, bool $skip_seen = true, ?array $seen = null
): string {
if ($skip_seen && !$seen) {
$seen = array();
}
$prev = $e->getPrevious();
if ($prev) {
$result[] = self::python_like_exception($prev, $skip_seen, $seen);
$result[] = "\nDuring handling of the above exception, another exception occurred:\n";
}
$trace = $e->getTrace();
// add the current line as well
$trace = array_merge([["file" => $e->getFile(), "line" => $e->getLine(), "function" => null, "args" => null]], $trace);
$str = self::python_like_trace($trace, $skip_seen, $seen, "# Exception thrown");
$str.= sprintf('%s: %s', get_class($e), $e->getMessage());
return $str;
}
static function python_like_trace(
array $trace, bool $skip_seen = false, ?array $seen = null, string $end_message='# You are here.'
): string {
if ($skip_seen && !$seen) {
$seen = array();
}
$result = array();
$trace = array_reverse($trace);
$trace_count = count($trace);
$result[] = "Traceback (most recent call last):";
$last_stack = null;
$current = null;
while ($trace_count > 0) {
$stack = $trace[0];
$last_current = $current;
$current = serialize($stack);
if ($skip_seen && is_array($seen) && in_array($current, $seen) && in_array($last_current, $seen)) {
$duplications = 1;
while ($trace_count > 1) {
$last_stack = $stack;
$stack = $trace[0];
$current = serialize($stack);
if (!in_array($current, $seen)) {
$result[] = sprintf(' ... %d more ...', $duplications + 1);
break;
}
$duplications++;
array_shift($trace);
$trace_count--;
}
echo "";
}
//File "/Users/me/Desktop/exception_test.py", line 8, in foo
if ($last_stack) {
$func_name = sprintf('%s%s%s',
$trace_count && array_key_exists('class', $last_stack) ? str_replace('\\', '.', $last_stack['class']) : '',
$trace_count && array_key_exists('class', $last_stack) && array_key_exists('function', $last_stack) ? '.' : '', // dot only if function and class.
$trace_count && array_key_exists('function', $last_stack) && $last_stack['function'] ? str_replace('\\', '.', $last_stack['function']) : '{???}'
);
} else {
$func_name = '{main}';
}
$last_stack = $stack;
$result[] = sprintf(' File %s%s in %s',
array_key_exists('file', $stack) ? '"'.$stack['file'].'"' : 'Unknown Source',
array_key_exists('file', $stack) && array_key_exists('line', $stack) && $stack['line'] ? sprintf(', line %s', $stack['line']) : '',
$func_name
);
if ($trace_count > 1) {
$result[] = sprintf(" %s%s%s(%s)",
$trace_count && array_key_exists('class', $stack) ? str_replace('\\', '.', $stack['class']) : '',
$trace_count && array_key_exists('class', $stack) && array_key_exists('function', $stack) ? (array_key_exists('type', $stack) ? $stack['type'] : '.') : '', // dot only if function and class.
$trace_count && array_key_exists('function', $stack) && $stack['function'] ? str_replace('\\', '.', $stack['function']) : '{main}',
$trace_count && array_key_exists('function', $stack) && $stack['args'] !== null ? implode(", ", array_map(function ($arg) use ($stack) {return implode('', array_map(function ($line) use ($stack) { return trim($line); }, explode("\n", @var_export($arg, true))));}, $stack['args'])) : '…'
);
} else {
$result[] = sprintf(" %s", $end_message);
}
if ($skip_seen && is_array($seen)) {
$seen[] = $current;
}
if (!$trace_count) {
break;
}
array_shift($trace);
$trace_count--;
}
$result = join("\n", $result);
return $result;
}
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