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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Workflow\Dumper;
use Symfony\Component\Workflow\Definition;
use Symfony\Component\Workflow\Exception\InvalidArgumentException;
use Symfony\Component\Workflow\Marking;
class MermaidDumper implements DumperInterface
{
public const DIRECTION_TOP_TO_BOTTOM = 'TB';
public const DIRECTION_TOP_DOWN = 'TD';
public const DIRECTION_BOTTOM_TO_TOP = 'BT';
public const DIRECTION_RIGHT_TO_LEFT = 'RL';
public const DIRECTION_LEFT_TO_RIGHT = 'LR';
private const VALID_DIRECTIONS = [
self::DIRECTION_TOP_TO_BOTTOM,
self::DIRECTION_TOP_DOWN,
self::DIRECTION_BOTTOM_TO_TOP,
self::DIRECTION_RIGHT_TO_LEFT,
self::DIRECTION_LEFT_TO_RIGHT,
];
public const TRANSITION_TYPE_STATEMACHINE = 'statemachine';
public const TRANSITION_TYPE_WORKFLOW = 'workflow';
private const VALID_TRANSITION_TYPES = [
self::TRANSITION_TYPE_STATEMACHINE,
self::TRANSITION_TYPE_WORKFLOW,
];
/**
* @var string
*/
private $direction;
/**
* @var string
*/
private $transitionType;
/**
* Just tracking the transition id is in some cases inaccurate to
* get the link's number for styling purposes.
*
* @var int
*/
private $linkCount;
public function __construct(string $transitionType, string $direction = self::DIRECTION_LEFT_TO_RIGHT)
{
$this->validateDirection($direction);
$this->validateTransitionType($transitionType);
$this->direction = $direction;
$this->transitionType = $transitionType;
}
public function dump(Definition $definition, Marking $marking = null, array $options = []): string
{
$this->linkCount = 0;
$placeNameMap = [];
$placeId = 0;
$output = ['graph '.$this->direction];
$meta = $definition->getMetadataStore();
foreach ($definition->getPlaces() as $place) {
[$placeNodeName, $placeNode, $placeStyle] = $this->preparePlace(
$placeId,
$place,
$meta->getPlaceMetadata($place),
\in_array($place, $definition->getInitialPlaces()),
null !== $marking && $marking->has($place)
);
$output[] = $placeNode;
if ('' !== $placeStyle) {
$output[] = $placeStyle;
}
$placeNameMap[$place] = $placeNodeName;
++$placeId;
}
foreach ($definition->getTransitions() as $transitionId => $transition) {
$transitionMeta = $meta->getTransitionMetadata($transition);
$transitionLabel = $transition->getName();
if (\array_key_exists('label', $transitionMeta)) {
$transitionLabel = $transitionMeta['label'];
}
foreach ($transition->getFroms() as $from) {
$from = $placeNameMap[$from];
foreach ($transition->getTos() as $to) {
$to = $placeNameMap[$to];
if (self::TRANSITION_TYPE_STATEMACHINE === $this->transitionType) {
$transitionOutput = $this->styleStatemachineTransition(
$from,
$to,
$transitionId,
$transitionLabel,
$transitionMeta
);
} else {
$transitionOutput = $this->styleWorkflowTransition(
$from,
$to,
$transitionId,
$transitionLabel,
$transitionMeta
);
}
foreach ($transitionOutput as $line) {
if (\in_array($line, $output)) {
// additional links must be decremented again to align the styling
if (0 < strpos($line, '-->')) {
--$this->linkCount;
}
continue;
}
$output[] = $line;
}
}
}
}
return implode("\n", $output);
}
private function preparePlace(int $placeId, string $placeName, array $meta, bool $isInitial, bool $hasMarking): array
{
$placeLabel = $placeName;
if (\array_key_exists('label', $meta)) {
$placeLabel = $meta['label'];
}
$placeLabel = $this->escape($placeLabel);
$labelShape = '((%s))';
if ($isInitial) {
$labelShape = '([%s])';
}
$placeNodeName = 'place'.$placeId;
$placeNodeFormat = '%s'.$labelShape;
$placeNode = sprintf($placeNodeFormat, $placeNodeName, $placeLabel);
$placeStyle = $this->styleNode($meta, $placeNodeName, $hasMarking);
return [$placeNodeName, $placeNode, $placeStyle];
}
private function styleNode(array $meta, string $nodeName, bool $hasMarking = false): string
{
$nodeStyles = [];
if (\array_key_exists('bg_color', $meta)) {
$nodeStyles[] = sprintf(
'fill:%s',
$meta['bg_color']
);
}
if ($hasMarking) {
$nodeStyles[] = 'stroke-width:4px';
}
if (0 === \count($nodeStyles)) {
return '';
}
return sprintf('style %s %s', $nodeName, implode(',', $nodeStyles));
}
/**
* Replace double quotes with the mermaid escape syntax and
* ensure all other characters are properly escaped.
*/
private function escape(string $label)
{
$label = str_replace('"', '#quot;', $label);
return sprintf('"%s"', $label);
}
public function validateDirection(string $direction): void
{
if (!\in_array($direction, self::VALID_DIRECTIONS, true)) {
throw new InvalidArgumentException(sprintf('Direction "%s" is not valid, valid directions are: "%s".', $direction, implode(', ', self::VALID_DIRECTIONS)));
}
}
private function validateTransitionType(string $transitionType): void
{
if (!\in_array($transitionType, self::VALID_TRANSITION_TYPES, true)) {
throw new InvalidArgumentException(sprintf('Transition type "%s" is not valid, valid types are: "%s".', $transitionType, implode(', ', self::VALID_TRANSITION_TYPES)));
}
}
private function styleStatemachineTransition(
string $from,
string $to,
int $transitionId,
string $transitionLabel,
array $transitionMeta
): array {
$transitionOutput = [sprintf('%s-->|%s|%s', $from, str_replace("\n", ' ', $this->escape($transitionLabel)), $to)];
$linkStyle = $this->styleLink($transitionMeta);
if ('' !== $linkStyle) {
$transitionOutput[] = $linkStyle;
}
++$this->linkCount;
return $transitionOutput;
}
private function styleWorkflowTransition(
string $from,
string $to,
int $transitionId,
string $transitionLabel,
array $transitionMeta
) {
$transitionOutput = [];
$transitionLabel = $this->escape($transitionLabel);
$transitionNodeName = 'transition'.$transitionId;
$transitionOutput[] = sprintf('%s[%s]', $transitionNodeName, $transitionLabel);
$transitionNodeStyle = $this->styleNode($transitionMeta, $transitionNodeName);
if ('' !== $transitionNodeStyle) {
$transitionOutput[] = $transitionNodeStyle;
}
$connectionStyle = '%s-->%s';
$transitionOutput[] = sprintf($connectionStyle, $from, $transitionNodeName);
$linkStyle = $this->styleLink($transitionMeta);
if ('' !== $linkStyle) {
$transitionOutput[] = $linkStyle;
}
++$this->linkCount;
$transitionOutput[] = sprintf($connectionStyle, $transitionNodeName, $to);
$linkStyle = $this->styleLink($transitionMeta);
if ('' !== $linkStyle) {
$transitionOutput[] = $linkStyle;
}
++$this->linkCount;
return $transitionOutput;
}
private function styleLink(array $transitionMeta): string
{
if (\array_key_exists('color', $transitionMeta)) {
return sprintf('linkStyle %d stroke:%s', $this->linkCount, $transitionMeta['color']);
}
return '';
}
}