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<?php
/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
namespace Icinga\Module\Icingadb\Util;
use ArrayIterator;
use IteratorAggregate;
class PerfDataSet implements IteratorAggregate
{
/**
* The performance data being parsed
*
* @var string
*/
protected $perfdataStr;
/**
* The current parsing position
*
* @var int
*/
protected $parserPos = 0;
/**
* A list of PerfData objects
*
* @var array
*/
protected $perfdata = array();
/**
* Create a new set of performance data
*
* @param string $perfdataStr A space separated list of label/value pairs
*/
protected function __construct(string $perfdataStr)
{
if (($perfdataStr = trim($perfdataStr)) !== '') {
$this->perfdataStr = $perfdataStr;
$this->parse();
}
}
/**
* Return a iterator for this set of performance data
*
* @return ArrayIterator
*/
public function getIterator(): ArrayIterator
{
return new ArrayIterator($this->asArray());
}
/**
* Return a new set of performance data
*
* @param string $perfdataStr A space separated list of label/value pairs
*
* @return PerfDataSet
*/
public static function fromString(string $perfdataStr): self
{
return new static($perfdataStr);
}
/**
* Return this set of performance data as array
*
* @return array
*/
public function asArray(): array
{
return $this->perfdata;
}
/**
* Parse the current performance data
*/
protected function parse()
{
while ($this->parserPos < strlen($this->perfdataStr)) {
$label = trim($this->readLabel());
$value = trim($this->readUntil(' '));
if ($label) {
$this->perfdata[] = new PerfData($label, $value);
}
}
uasort(
$this->perfdata,
function ($a, $b) {
if ($a->isVisualizable() && ! $b->isVisualizable()) {
return -1;
} elseif (! $a->isVisualizable() && $b->isVisualizable()) {
return 1;
} elseif (! $a->isVisualizable() && ! $b->isVisualizable()) {
return 0;
}
return $a->worseThan($b) ? -1 : ($b->worseThan($a) ? 1 : 0);
}
);
}
/**
* Return the next label found in the performance data
*
* @return string The label found
*/
protected function readLabel(): string
{
$this->skipSpaces();
if (in_array($this->perfdataStr[$this->parserPos], array('"', "'"))) {
$quoteChar = $this->perfdataStr[$this->parserPos++];
$label = $this->readUntil($quoteChar);
$this->parserPos++;
if ($this->perfdataStr[$this->parserPos] === '=') {
$this->parserPos++;
}
} else {
$label = $this->readUntil('=');
$this->parserPos++;
}
$this->skipSpaces();
return $label;
}
/**
* Return all characters between the current parser position and the given character
*
* @param string $stopChar The character on which to stop
*
* @return string
*/
protected function readUntil(string $stopChar): string
{
$start = $this->parserPos;
while ($this->parserPos < strlen($this->perfdataStr) && $this->perfdataStr[$this->parserPos] !== $stopChar) {
$this->parserPos++;
}
return substr($this->perfdataStr, $start, $this->parserPos - $start);
}
/**
* Advance the parser position to the next non-whitespace character
*/
protected function skipSpaces()
{
while ($this->parserPos < strlen($this->perfdataStr) && $this->perfdataStr[$this->parserPos] === ' ') {
$this->parserPos++;
}
}
}
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