WorkflowBundle/Validator/Constraints/ContainsYamlValidator.php

<?php
namespace WorkflowBundle\Validator\Constraints;

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Yaml\Yaml;
use Symfony\Component\Yaml\Exception\DumpException;
use Symfony\Component\Yaml\Exception\ParseException;
use Symfony\Component\Workflow\Definition;
use Symfony\Component\Workflow\Validator\StateMachineValidator;
use Symfony\Component\Workflow\Validator\WorkflowValidator;
use Symfony\Component\Workflow\Transition;

class ContainsYamlValidator extends ConstraintValidator
{
    public function validate($value, Constraint $constraint)
    {
        $valids_keys = array("supports","initial_place","places","transitions");

        $object = $this->context->getObject();
        $type = $object->getType();
        $markingType = $object->getMarkingType();
        $name = $this->context->getObject();;

        //Validate Format YAML
        try {
            $yaml = Yaml::parse($value,100,2);
        } catch (DumpException $e) {
            $this->context->buildViolation("errors.workflow_template_format_error")->setParameter('%string%', "")->addViolation();
            return;
        } catch (ParseException $e) {
            $this->context->buildViolation("errors.workflow_template_format_error")->setParameter('%string%', "")->addViolation();
            return;
        }

        if($yaml) {
            $no_valid_key = false;
            foreach($yaml as $key => $d) {
                if(!in_array($key,$valids_keys)) {
                    $no_valid_key = true;
                    $this->context->buildViolation("errors.workflow_template_key_invalid")->setParameter('%key%', $key)->addViolation();
                }
            }
            if($no_valid_key) return;
        } else {
            $this->context->buildViolation("errors.workflow_template_format_error")->setParameter('%string%', "")->addViolation();
            return;
        }

        //Validate Template SUPPORTS
        if(isset($yaml['supports'])) {
            if(!is_array($yaml['supports'])) {
                $this->context->buildViolation("errors.workflow_template_supports_error")->setParameter('%string%', "")->addViolation();
            } elseif(count($yaml['supports']) == 0) {
                $this->context->buildViolation("errors.workflow_template_supports_empty")->setParameter('%string%', "")->addViolation();
            } else {
                foreach($yaml['supports'] as $k => $class) {
                    if(!class_exists($class)) {
                        $this->context->buildViolation("errors.workflow_template_supports_class_error")->setParameter('%class%', $class)->addViolation();
                    }
                }
            }
        } else {
            $this->context->buildViolation("errors.workflow_template_supports_undefined")->setParameter('%string%', "")->addViolation();
        }

        //Validate Template PLACES
        $places = array();
        if(isset($yaml['places'])) {
            $places = $yaml['places'];
        } else {
            $this->context->buildViolation("errors.workflow_template_places_undefined")->setParameter('%string%', "")->addViolation();
        }

        $transitions = array();
        if(isset($yaml['transitions'])) {
            foreach($yaml['transitions'] as $k => $data) {

                $transitions[] = new Transition($k,$data['from'],$data['to']);
            }
        } else {
            $this->context->buildViolation("errors.workflow_template_transitions_undefined")->setParameter('%string%', "")->addViolation();
        }

        //Validate Definition
        if($type == "workflow") {
            $mt = ($markingType == "single_state");
            $validator = new WorkflowValidator($mt);
        } else {
            $validator = new StateMachineValidator();
        }

        $initialPlace = null;
        if(isset($yaml['initial_place'])) {
            $initialPlace = $yaml['initial_place'];
        }

        try {
            $definition = new Definition($places,$transitions,$initialPlace);
            $validator->validate($definition, $name);
        }  catch (\Exception $e) {
            $this->context->buildViolation("Exception: ".$e->getMessage())->setParameter('%string%', "")->addViolation();
            return;
        }  catch (\LogicException $e) {
            $this->context->buildViolation("Exception: ".$e->getMessage())->setParameter('%string%', "")->addViolation();
            return;
        }


    }
}