eventespresso / event-espresso-core

core/libraries/form_sections/form_handlers/SequentialStepFormManager.php

Indentation +578 added lines, -578 removed lines

@@ -30,582 +30,582 @@
 abstract class SequentialStepFormManager
 {
 
-    /**
-     * a simplified URL with no form related parameters
-     * that will be used to build the form's redirect URLs
-     *
-     * @var string $base_url
-     */
-    private $base_url = '';
-
-    /**
-     * the key used for the URL param that denotes the current form step
-     * defaults to 'ee-form-step'
-     *
-     * @var string $form_step_url_key
-     */
-    private $form_step_url_key = '';
-
-    /**
-     * @var string $default_form_step
-     */
-    private $default_form_step = '';
-
-    /**
-     * @var string $form_action
-     */
-    private $form_action;
-
-    /**
-     * value of one of the string constant above
-     *
-     * @var string $form_config
-     */
-    private $form_config;
-
-    /**
-     * @var string $progress_step_style
-     */
-    private $progress_step_style = '';
-
-    /**
-     * @var RequestInterface $request
-     */
-    private $request;
-
-    /**
-     * @var Collection $form_steps
-     */
-    protected $form_steps;
-
-    /**
-     * @var ProgressStepManager $progress_step_manager
-     */
-    protected $progress_step_manager;
-
-
-    /**
-     * @return Collection|null
-     */
-    abstract protected function getFormStepsCollection();
-
-    // phpcs:disable PEAR.Functions.ValidDefaultValue.NotAtEnd
-    /**
-     * StepsManager constructor
-     *
-     * @param string                           $base_url
-     * @param string                           $default_form_step
-     * @param string                           $form_action
-     * @param string                           $form_config
-     * @param EE_Request|RequestInterface|null $request
-     * @param string                           $progress_step_style
-     * @throws InvalidDataTypeException
-     * @throws InvalidArgumentException
-     */
-    public function __construct(
-        $base_url,
-        $default_form_step,
-        $form_action = '',
-        $form_config = FormHandler::ADD_FORM_TAGS_AND_SUBMIT,
-        $progress_step_style = 'number_bubbles',
-        $request = null
-    ) {
-        $this->setBaseUrl($base_url);
-        $this->setDefaultFormStep($default_form_step);
-        $this->setFormAction($form_action);
-        $this->setFormConfig($form_config);
-        $this->setProgressStepStyle($progress_step_style);
-        $this->request = $request instanceof RequestInterface
-            ?: LoaderFactory::getLoader()->getShared('EventEspresso\core\services\request\RequestInterface');
-    }
-
-
-    /**
-     * @return string
-     * @throws InvalidFormHandlerException
-     */
-    public function baseUrl()
-    {
-        if (strpos($this->base_url, $this->getCurrentStep()->slug()) === false) {
-            add_query_arg(
-                array($this->form_step_url_key => $this->getCurrentStep()->slug()),
-                $this->base_url
-            );
-        }
-        return $this->base_url;
-    }
-
-
-    /**
-     * @param string $base_url
-     * @throws InvalidDataTypeException
-     * @throws InvalidArgumentException
-     */
-    protected function setBaseUrl($base_url)
-    {
-        if (! is_string($base_url)) {
-            throw new InvalidDataTypeException('$base_url', $base_url, 'string');
-        }
-        if (empty($base_url)) {
-            throw new InvalidArgumentException(
-                esc_html__('The base URL can not be an empty string.', 'event_espresso')
-            );
-        }
-        $this->base_url = $base_url;
-    }
-
-
-    /**
-     * @return string
-     * @throws InvalidDataTypeException
-     */
-    public function formStepUrlKey()
-    {
-        if (empty($this->form_step_url_key)) {
-            $this->setFormStepUrlKey();
-        }
-        return $this->form_step_url_key;
-    }
-
-
-    /**
-     * @param string $form_step_url_key
-     * @throws InvalidDataTypeException
-     */
-    public function setFormStepUrlKey($form_step_url_key = 'ee-form-step')
-    {
-        if (! is_string($form_step_url_key)) {
-            throw new InvalidDataTypeException('$form_step_key', $form_step_url_key, 'string');
-        }
-        $this->form_step_url_key = ! empty($form_step_url_key) ? $form_step_url_key : 'ee-form-step';
-    }
-
-
-    /**
-     * @return string
-     */
-    public function defaultFormStep()
-    {
-        return $this->default_form_step;
-    }
-
-
-    /**
-     * @param $default_form_step
-     * @throws InvalidDataTypeException
-     */
-    protected function setDefaultFormStep($default_form_step)
-    {
-        if (! is_string($default_form_step)) {
-            throw new InvalidDataTypeException('$default_form_step', $default_form_step, 'string');
-        }
-        $this->default_form_step = $default_form_step;
-    }
-
-
-    /**
-     * @return void
-     * @throws InvalidIdentifierException
-     * @throws InvalidDataTypeException
-     */
-    protected function setCurrentStepFromRequest()
-    {
-        $current_step_slug = $this->request()->getRequestParam($this->formStepUrlKey(), $this->defaultFormStep());
-        if (! $this->form_steps->setCurrent($current_step_slug)) {
-            throw new InvalidIdentifierException(
-                $current_step_slug,
-                $this->defaultFormStep(),
-                sprintf(
-                    esc_html__('The "%1$s" form step could not be set.', 'event_espresso'),
-                    $current_step_slug
-                )
-            );
-        }
-    }
-
-
-    /**
-     * @return SequentialStepFormInterface|object
-     * @throws InvalidFormHandlerException
-     */
-    public function getCurrentStep()
-    {
-        if (! $this->form_steps->current() instanceof SequentialStepForm) {
-            throw new InvalidFormHandlerException($this->form_steps->current());
-        }
-        return $this->form_steps->current();
-    }
-
-
-    /**
-     * @return string
-     * @throws InvalidFormHandlerException
-     */
-    public function formAction()
-    {
-        if (! is_string($this->form_action) || empty($this->form_action)) {
-            $this->form_action = $this->baseUrl();
-        }
-        return $this->form_action;
-    }
-
-
-    /**
-     * @param string $form_action
-     * @throws InvalidDataTypeException
-     */
-    public function setFormAction($form_action)
-    {
-        if (! is_string($form_action)) {
-            throw new InvalidDataTypeException('$form_action', $form_action, 'string');
-        }
-        $this->form_action = $form_action;
-    }
-
-
-    /**
-     * @param array $form_action_args
-     * @throws InvalidDataTypeException
-     * @throws InvalidFormHandlerException
-     */
-    public function addFormActionArgs($form_action_args = array())
-    {
-        if (! is_array($form_action_args)) {
-            throw new InvalidDataTypeException('$form_action_args', $form_action_args, 'array');
-        }
-        $form_action_args = ! empty($form_action_args)
-            ? $form_action_args
-            : array($this->formStepUrlKey() => $this->form_steps->current()->slug());
-        $this->getCurrentStep()->setFormAction(
-            add_query_arg($form_action_args, $this->formAction())
-        );
-        $this->form_action = $this->getCurrentStep()->formAction();
-    }
-
-
-    /**
-     * @return string
-     */
-    public function formConfig()
-    {
-        return $this->form_config;
-    }
-
-
-    /**
-     * @param string $form_config
-     */
-    public function setFormConfig($form_config)
-    {
-        $this->form_config = $form_config;
-    }
-
-
-    /**
-     * @return string
-     */
-    public function progressStepStyle()
-    {
-        return $this->progress_step_style;
-    }
-
-
-    /**
-     * @param string $progress_step_style
-     */
-    public function setProgressStepStyle($progress_step_style)
-    {
-        $this->progress_step_style = $progress_step_style;
-    }
-
-
-    /**
-     * @return RequestInterface
-     */
-    public function request()
-    {
-        return $this->request;
-    }
-
-
-    /**
-     * @return Collection|null
-     * @throws InvalidInterfaceException
-     */
-    protected function getProgressStepsCollection()
-    {
-        static $collection = null;
-        if (! $collection instanceof ProgressStepCollection) {
-            $collection = new ProgressStepCollection();
-        }
-        return $collection;
-    }
-
-
-    /**
-     * @param Collection $progress_steps_collection
-     * @return ProgressStepManager
-     * @throws InvalidInterfaceException
-     * @throws InvalidClassException
-     * @throws InvalidDataTypeException
-     * @throws InvalidEntityException
-     * @throws InvalidFormHandlerException
-     */
-    protected function generateProgressSteps(Collection $progress_steps_collection)
-    {
-        $current_step = $this->getCurrentStep();
-        /** @var SequentialStepForm $form_step */
-        foreach ($this->form_steps as $form_step) {
-            // is this step active ?
-            if (! $form_step->initialize()) {
-                continue;
-            }
-            $progress_steps_collection->add(
-                new ProgressStep(
-                    $form_step->order(),
-                    $form_step->slug(),
-                    $form_step->slug(),
-                    $form_step->formName()
-                ),
-                $form_step->slug()
-            );
-        }
-        // set collection pointer back to current step
-        $this->form_steps->setCurrentUsingObject($current_step);
-        return new ProgressStepManager(
-            $this->progressStepStyle(),
-            $this->defaultFormStep(),
-            $this->formStepUrlKey(),
-            $progress_steps_collection
-        );
-    }
-
-
-    /**
-     * @throws InvalidClassException
-     * @throws InvalidDataTypeException
-     * @throws InvalidEntityException
-     * @throws InvalidIdentifierException
-     * @throws InvalidInterfaceException
-     * @throws InvalidArgumentException
-     * @throws InvalidFormHandlerException
-     */
-    public function buildForm()
-    {
-        $this->buildCurrentStepFormForDisplay();
-    }
-
-
-    /**
-     * @param array $form_data
-     * @throws InvalidArgumentException
-     * @throws InvalidClassException
-     * @throws InvalidDataTypeException
-     * @throws InvalidEntityException
-     * @throws InvalidFormHandlerException
-     * @throws InvalidIdentifierException
-     * @throws InvalidInterfaceException
-     */
-    public function processForm($form_data = array())
-    {
-        $this->buildCurrentStepFormForProcessing();
-        $this->processCurrentStepForm($form_data);
-    }
-
-
-    /**
-     * @throws InvalidClassException
-     * @throws InvalidDataTypeException
-     * @throws InvalidEntityException
-     * @throws InvalidInterfaceException
-     * @throws InvalidIdentifierException
-     * @throws InvalidArgumentException
-     * @throws InvalidFormHandlerException
-     */
-    public function buildCurrentStepFormForDisplay()
-    {
-        $form_step = $this->buildCurrentStepForm();
-        // no displayable content ? then skip straight to processing
-        if (! $form_step->displayable()) {
-            $this->addFormActionArgs();
-            $form_step->setFormAction($this->formAction());
-            wp_safe_redirect($form_step->formAction());
-        }
-    }
-
-
-    /**
-     * @throws InvalidClassException
-     * @throws InvalidDataTypeException
-     * @throws InvalidEntityException
-     * @throws InvalidInterfaceException
-     * @throws InvalidIdentifierException
-     * @throws InvalidArgumentException
-     * @throws InvalidFormHandlerException
-     */
-    public function buildCurrentStepFormForProcessing()
-    {
-        $this->buildCurrentStepForm(false);
-    }
-
-
-    /**
-     * @param bool $for_display
-     * @return SequentialStepFormInterface
-     * @throws InvalidArgumentException
-     * @throws InvalidClassException
-     * @throws InvalidDataTypeException
-     * @throws InvalidEntityException
-     * @throws InvalidFormHandlerException
-     * @throws InvalidIdentifierException
-     * @throws InvalidInterfaceException
-     */
-    private function buildCurrentStepForm($for_display = true)
-    {
-        $this->form_steps = $this->getFormStepsCollection();
-        $this->setCurrentStepFromRequest();
-        $form_step = $this->getCurrentStep();
-        if ($form_step->submitBtnText() === esc_html__('Submit', 'event_espresso')) {
-            $form_step->setSubmitBtnText(esc_html__('Next Step', 'event_espresso'));
-        }
-        if ($for_display && $form_step->displayable()) {
-            $this->progress_step_manager = $this->generateProgressSteps(
-                $this->getProgressStepsCollection()
-            );
-            $this->progress_step_manager->setCurrentStep(
-                $form_step->slug()
-            );
-            // mark all previous progress steps as completed
-            $this->progress_step_manager->setPreviousStepsCompleted();
-            $this->progress_step_manager->enqueueStylesAndScripts();
-            $this->addFormActionArgs();
-            $form_step->setFormAction($this->formAction());
-        } else {
-            $form_step->setRedirectUrl($this->baseUrl());
-            $form_step->addRedirectArgs(
-                array($this->formStepUrlKey() => $this->form_steps->current()->slug())
-            );
-        }
-        $form_step->generate();
-        if ($for_display) {
-            $form_step->enqueueStylesAndScripts();
-        }
-        return $form_step;
-    }
-
-
-    /**
-     * @param bool $return_as_string
-     * @return string
-     * @throws InvalidFormHandlerException
-     */
-    public function displayProgressSteps($return_as_string = true)
-    {
-        $form_step = $this->getCurrentStep();
-        if (! $form_step->displayable()) {
-            return '';
-        }
-        $progress_steps = apply_filters(
-            'FHEE__EventEspresso_core_libraries_form_sections_form_handlers_SequentialStepFormManager__displayProgressSteps__before_steps',
-            ''
-        );
-        $progress_steps .= $this->progress_step_manager->displaySteps();
-        $progress_steps .= apply_filters(
-            'FHEE__EventEspresso_core_libraries_form_sections_form_handlers_SequentialStepFormManager__displayProgressSteps__after_steps',
-            ''
-        );
-        if ($return_as_string) {
-            return $progress_steps;
-        }
-        echo $progress_steps; // already escaped
-        return '';
-    }
-
-
-    /**
-     * @param bool $return_as_string
-     * @return string
-     * @throws InvalidFormHandlerException
-     */
-    public function displayCurrentStepForm($return_as_string = true)
-    {
-        if ($return_as_string) {
-            return $this->getCurrentStep()->display();
-        }
-        echo $this->getCurrentStep()->display(); // already escaped
-        return '';
-    }
-
-
-    /**
-     * @param array $form_data
-     * @return void
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidFormHandlerException
-     */
-    public function processCurrentStepForm($form_data = array())
-    {
-        // grab instance of current step because after calling next() below,
-        // any calls to getCurrentStep() will return the "next" step because we advanced
-        $current_step = $this->getCurrentStep();
-        try {
-            // form processing should either throw exceptions or return true
-            $current_step->process($form_data);
-        } catch (Exception $e) {
-            // something went wrong, convert the Exception to an EE_Error
-            EE_Error::add_error($e->getMessage(), __FILE__, __FUNCTION__, __LINE__);
-            // prevent redirect to next step or other if exception was thrown
-            if (
-                $current_step->redirectTo() === SequentialStepForm::REDIRECT_TO_NEXT_STEP
-                || $current_step->redirectTo() === SequentialStepForm::REDIRECT_TO_OTHER
-            ) {
-                $current_step->setRedirectTo(SequentialStepForm::REDIRECT_TO_CURRENT_STEP);
-            }
-        }
-        // save notices to a transient so that when we redirect back
-        // to the display portion for this step
-        // those notices can be displayed
-        EE_Error::get_notices(false, true);
-        $this->redirectForm($current_step);
-    }
-
-
-    /**
-     * handles where to go to next
-     *
-     * @param SequentialStepFormInterface $current_step
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidFormHandlerException
-     */
-    public function redirectForm(SequentialStepFormInterface $current_step)
-    {
-        $redirect_step = $current_step;
-        switch ($current_step->redirectTo()) {
-            case SequentialStepForm::REDIRECT_TO_OTHER:
-                // going somewhere else, so just check out now
-                wp_safe_redirect($redirect_step->redirectUrl());
-                exit();
-            case SequentialStepForm::REDIRECT_TO_PREV_STEP:
-                $redirect_step = $this->form_steps->previous();
-                break;
-            case SequentialStepForm::REDIRECT_TO_NEXT_STEP:
-                $this->form_steps->next();
-                if ($this->form_steps->valid()) {
-                    $redirect_step = $this->form_steps->current();
-                }
-                break;
-            case SequentialStepForm::REDIRECT_TO_CURRENT_STEP:
-            default:
-                // $redirect_step is already set
-        }
-        $current_step->setRedirectUrl($this->baseUrl());
-        $current_step->addRedirectArgs(
-            // use the slug for whatever step we are redirecting too
-            array($this->formStepUrlKey() => $redirect_step->slug())
-        );
-        wp_safe_redirect($current_step->redirectUrl());
-        exit();
-    }
+	/**
+	 * a simplified URL with no form related parameters
+	 * that will be used to build the form's redirect URLs
+	 *
+	 * @var string $base_url
+	 */
+	private $base_url = '';
+
+	/**
+	 * the key used for the URL param that denotes the current form step
+	 * defaults to 'ee-form-step'
+	 *
+	 * @var string $form_step_url_key
+	 */
+	private $form_step_url_key = '';
+
+	/**
+	 * @var string $default_form_step
+	 */
+	private $default_form_step = '';
+
+	/**
+	 * @var string $form_action
+	 */
+	private $form_action;
+
+	/**
+	 * value of one of the string constant above
+	 *
+	 * @var string $form_config
+	 */
+	private $form_config;
+
+	/**
+	 * @var string $progress_step_style
+	 */
+	private $progress_step_style = '';
+
+	/**
+	 * @var RequestInterface $request
+	 */
+	private $request;
+
+	/**
+	 * @var Collection $form_steps
+	 */
+	protected $form_steps;
+
+	/**
+	 * @var ProgressStepManager $progress_step_manager
+	 */
+	protected $progress_step_manager;
+
+
+	/**
+	 * @return Collection|null
+	 */
+	abstract protected function getFormStepsCollection();
+
+	// phpcs:disable PEAR.Functions.ValidDefaultValue.NotAtEnd
+	/**
+	 * StepsManager constructor
+	 *
+	 * @param string                           $base_url
+	 * @param string                           $default_form_step
+	 * @param string                           $form_action
+	 * @param string                           $form_config
+	 * @param EE_Request|RequestInterface|null $request
+	 * @param string                           $progress_step_style
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidArgumentException
+	 */
+	public function __construct(
+		$base_url,
+		$default_form_step,
+		$form_action = '',
+		$form_config = FormHandler::ADD_FORM_TAGS_AND_SUBMIT,
+		$progress_step_style = 'number_bubbles',
+		$request = null
+	) {
+		$this->setBaseUrl($base_url);
+		$this->setDefaultFormStep($default_form_step);
+		$this->setFormAction($form_action);
+		$this->setFormConfig($form_config);
+		$this->setProgressStepStyle($progress_step_style);
+		$this->request = $request instanceof RequestInterface
+			?: LoaderFactory::getLoader()->getShared('EventEspresso\core\services\request\RequestInterface');
+	}
+
+
+	/**
+	 * @return string
+	 * @throws InvalidFormHandlerException
+	 */
+	public function baseUrl()
+	{
+		if (strpos($this->base_url, $this->getCurrentStep()->slug()) === false) {
+			add_query_arg(
+				array($this->form_step_url_key => $this->getCurrentStep()->slug()),
+				$this->base_url
+			);
+		}
+		return $this->base_url;
+	}
+
+
+	/**
+	 * @param string $base_url
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidArgumentException
+	 */
+	protected function setBaseUrl($base_url)
+	{
+		if (! is_string($base_url)) {
+			throw new InvalidDataTypeException('$base_url', $base_url, 'string');
+		}
+		if (empty($base_url)) {
+			throw new InvalidArgumentException(
+				esc_html__('The base URL can not be an empty string.', 'event_espresso')
+			);
+		}
+		$this->base_url = $base_url;
+	}
+
+
+	/**
+	 * @return string
+	 * @throws InvalidDataTypeException
+	 */
+	public function formStepUrlKey()
+	{
+		if (empty($this->form_step_url_key)) {
+			$this->setFormStepUrlKey();
+		}
+		return $this->form_step_url_key;
+	}
+
+
+	/**
+	 * @param string $form_step_url_key
+	 * @throws InvalidDataTypeException
+	 */
+	public function setFormStepUrlKey($form_step_url_key = 'ee-form-step')
+	{
+		if (! is_string($form_step_url_key)) {
+			throw new InvalidDataTypeException('$form_step_key', $form_step_url_key, 'string');
+		}
+		$this->form_step_url_key = ! empty($form_step_url_key) ? $form_step_url_key : 'ee-form-step';
+	}
+
+
+	/**
+	 * @return string
+	 */
+	public function defaultFormStep()
+	{
+		return $this->default_form_step;
+	}
+
+
+	/**
+	 * @param $default_form_step
+	 * @throws InvalidDataTypeException
+	 */
+	protected function setDefaultFormStep($default_form_step)
+	{
+		if (! is_string($default_form_step)) {
+			throw new InvalidDataTypeException('$default_form_step', $default_form_step, 'string');
+		}
+		$this->default_form_step = $default_form_step;
+	}
+
+
+	/**
+	 * @return void
+	 * @throws InvalidIdentifierException
+	 * @throws InvalidDataTypeException
+	 */
+	protected function setCurrentStepFromRequest()
+	{
+		$current_step_slug = $this->request()->getRequestParam($this->formStepUrlKey(), $this->defaultFormStep());
+		if (! $this->form_steps->setCurrent($current_step_slug)) {
+			throw new InvalidIdentifierException(
+				$current_step_slug,
+				$this->defaultFormStep(),
+				sprintf(
+					esc_html__('The "%1$s" form step could not be set.', 'event_espresso'),
+					$current_step_slug
+				)
+			);
+		}
+	}
+
+
+	/**
+	 * @return SequentialStepFormInterface|object
+	 * @throws InvalidFormHandlerException
+	 */
+	public function getCurrentStep()
+	{
+		if (! $this->form_steps->current() instanceof SequentialStepForm) {
+			throw new InvalidFormHandlerException($this->form_steps->current());
+		}
+		return $this->form_steps->current();
+	}
+
+
+	/**
+	 * @return string
+	 * @throws InvalidFormHandlerException
+	 */
+	public function formAction()
+	{
+		if (! is_string($this->form_action) || empty($this->form_action)) {
+			$this->form_action = $this->baseUrl();
+		}
+		return $this->form_action;
+	}
+
+
+	/**
+	 * @param string $form_action
+	 * @throws InvalidDataTypeException
+	 */
+	public function setFormAction($form_action)
+	{
+		if (! is_string($form_action)) {
+			throw new InvalidDataTypeException('$form_action', $form_action, 'string');
+		}
+		$this->form_action = $form_action;
+	}
+
+
+	/**
+	 * @param array $form_action_args
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidFormHandlerException
+	 */
+	public function addFormActionArgs($form_action_args = array())
+	{
+		if (! is_array($form_action_args)) {
+			throw new InvalidDataTypeException('$form_action_args', $form_action_args, 'array');
+		}
+		$form_action_args = ! empty($form_action_args)
+			? $form_action_args
+			: array($this->formStepUrlKey() => $this->form_steps->current()->slug());
+		$this->getCurrentStep()->setFormAction(
+			add_query_arg($form_action_args, $this->formAction())
+		);
+		$this->form_action = $this->getCurrentStep()->formAction();
+	}
+
+
+	/**
+	 * @return string
+	 */
+	public function formConfig()
+	{
+		return $this->form_config;
+	}
+
+
+	/**
+	 * @param string $form_config
+	 */
+	public function setFormConfig($form_config)
+	{
+		$this->form_config = $form_config;
+	}
+
+
+	/**
+	 * @return string
+	 */
+	public function progressStepStyle()
+	{
+		return $this->progress_step_style;
+	}
+
+
+	/**
+	 * @param string $progress_step_style
+	 */
+	public function setProgressStepStyle($progress_step_style)
+	{
+		$this->progress_step_style = $progress_step_style;
+	}
+
+
+	/**
+	 * @return RequestInterface
+	 */
+	public function request()
+	{
+		return $this->request;
+	}
+
+
+	/**
+	 * @return Collection|null
+	 * @throws InvalidInterfaceException
+	 */
+	protected function getProgressStepsCollection()
+	{
+		static $collection = null;
+		if (! $collection instanceof ProgressStepCollection) {
+			$collection = new ProgressStepCollection();
+		}
+		return $collection;
+	}
+
+
+	/**
+	 * @param Collection $progress_steps_collection
+	 * @return ProgressStepManager
+	 * @throws InvalidInterfaceException
+	 * @throws InvalidClassException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidEntityException
+	 * @throws InvalidFormHandlerException
+	 */
+	protected function generateProgressSteps(Collection $progress_steps_collection)
+	{
+		$current_step = $this->getCurrentStep();
+		/** @var SequentialStepForm $form_step */
+		foreach ($this->form_steps as $form_step) {
+			// is this step active ?
+			if (! $form_step->initialize()) {
+				continue;
+			}
+			$progress_steps_collection->add(
+				new ProgressStep(
+					$form_step->order(),
+					$form_step->slug(),
+					$form_step->slug(),
+					$form_step->formName()
+				),
+				$form_step->slug()
+			);
+		}
+		// set collection pointer back to current step
+		$this->form_steps->setCurrentUsingObject($current_step);
+		return new ProgressStepManager(
+			$this->progressStepStyle(),
+			$this->defaultFormStep(),
+			$this->formStepUrlKey(),
+			$progress_steps_collection
+		);
+	}
+
+
+	/**
+	 * @throws InvalidClassException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidEntityException
+	 * @throws InvalidIdentifierException
+	 * @throws InvalidInterfaceException
+	 * @throws InvalidArgumentException
+	 * @throws InvalidFormHandlerException
+	 */
+	public function buildForm()
+	{
+		$this->buildCurrentStepFormForDisplay();
+	}
+
+
+	/**
+	 * @param array $form_data
+	 * @throws InvalidArgumentException
+	 * @throws InvalidClassException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidEntityException
+	 * @throws InvalidFormHandlerException
+	 * @throws InvalidIdentifierException
+	 * @throws InvalidInterfaceException
+	 */
+	public function processForm($form_data = array())
+	{
+		$this->buildCurrentStepFormForProcessing();
+		$this->processCurrentStepForm($form_data);
+	}
+
+
+	/**
+	 * @throws InvalidClassException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidEntityException
+	 * @throws InvalidInterfaceException
+	 * @throws InvalidIdentifierException
+	 * @throws InvalidArgumentException
+	 * @throws InvalidFormHandlerException
+	 */
+	public function buildCurrentStepFormForDisplay()
+	{
+		$form_step = $this->buildCurrentStepForm();
+		// no displayable content ? then skip straight to processing
+		if (! $form_step->displayable()) {
+			$this->addFormActionArgs();
+			$form_step->setFormAction($this->formAction());
+			wp_safe_redirect($form_step->formAction());
+		}
+	}
+
+
+	/**
+	 * @throws InvalidClassException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidEntityException
+	 * @throws InvalidInterfaceException
+	 * @throws InvalidIdentifierException
+	 * @throws InvalidArgumentException
+	 * @throws InvalidFormHandlerException
+	 */
+	public function buildCurrentStepFormForProcessing()
+	{
+		$this->buildCurrentStepForm(false);
+	}
+
+
+	/**
+	 * @param bool $for_display
+	 * @return SequentialStepFormInterface
+	 * @throws InvalidArgumentException
+	 * @throws InvalidClassException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidEntityException
+	 * @throws InvalidFormHandlerException
+	 * @throws InvalidIdentifierException
+	 * @throws InvalidInterfaceException
+	 */
+	private function buildCurrentStepForm($for_display = true)
+	{
+		$this->form_steps = $this->getFormStepsCollection();
+		$this->setCurrentStepFromRequest();
+		$form_step = $this->getCurrentStep();
+		if ($form_step->submitBtnText() === esc_html__('Submit', 'event_espresso')) {
+			$form_step->setSubmitBtnText(esc_html__('Next Step', 'event_espresso'));
+		}
+		if ($for_display && $form_step->displayable()) {
+			$this->progress_step_manager = $this->generateProgressSteps(
+				$this->getProgressStepsCollection()
+			);
+			$this->progress_step_manager->setCurrentStep(
+				$form_step->slug()
+			);
+			// mark all previous progress steps as completed
+			$this->progress_step_manager->setPreviousStepsCompleted();
+			$this->progress_step_manager->enqueueStylesAndScripts();
+			$this->addFormActionArgs();
+			$form_step->setFormAction($this->formAction());
+		} else {
+			$form_step->setRedirectUrl($this->baseUrl());
+			$form_step->addRedirectArgs(
+				array($this->formStepUrlKey() => $this->form_steps->current()->slug())
+			);
+		}
+		$form_step->generate();
+		if ($for_display) {
+			$form_step->enqueueStylesAndScripts();
+		}
+		return $form_step;
+	}
+
+
+	/**
+	 * @param bool $return_as_string
+	 * @return string
+	 * @throws InvalidFormHandlerException
+	 */
+	public function displayProgressSteps($return_as_string = true)
+	{
+		$form_step = $this->getCurrentStep();
+		if (! $form_step->displayable()) {
+			return '';
+		}
+		$progress_steps = apply_filters(
+			'FHEE__EventEspresso_core_libraries_form_sections_form_handlers_SequentialStepFormManager__displayProgressSteps__before_steps',
+			''
+		);
+		$progress_steps .= $this->progress_step_manager->displaySteps();
+		$progress_steps .= apply_filters(
+			'FHEE__EventEspresso_core_libraries_form_sections_form_handlers_SequentialStepFormManager__displayProgressSteps__after_steps',
+			''
+		);
+		if ($return_as_string) {
+			return $progress_steps;
+		}
+		echo $progress_steps; // already escaped
+		return '';
+	}
+
+
+	/**
+	 * @param bool $return_as_string
+	 * @return string
+	 * @throws InvalidFormHandlerException
+	 */
+	public function displayCurrentStepForm($return_as_string = true)
+	{
+		if ($return_as_string) {
+			return $this->getCurrentStep()->display();
+		}
+		echo $this->getCurrentStep()->display(); // already escaped
+		return '';
+	}
+
+
+	/**
+	 * @param array $form_data
+	 * @return void
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidFormHandlerException
+	 */
+	public function processCurrentStepForm($form_data = array())
+	{
+		// grab instance of current step because after calling next() below,
+		// any calls to getCurrentStep() will return the "next" step because we advanced
+		$current_step = $this->getCurrentStep();
+		try {
+			// form processing should either throw exceptions or return true
+			$current_step->process($form_data);
+		} catch (Exception $e) {
+			// something went wrong, convert the Exception to an EE_Error
+			EE_Error::add_error($e->getMessage(), __FILE__, __FUNCTION__, __LINE__);
+			// prevent redirect to next step or other if exception was thrown
+			if (
+				$current_step->redirectTo() === SequentialStepForm::REDIRECT_TO_NEXT_STEP
+				|| $current_step->redirectTo() === SequentialStepForm::REDIRECT_TO_OTHER
+			) {
+				$current_step->setRedirectTo(SequentialStepForm::REDIRECT_TO_CURRENT_STEP);
+			}
+		}
+		// save notices to a transient so that when we redirect back
+		// to the display portion for this step
+		// those notices can be displayed
+		EE_Error::get_notices(false, true);
+		$this->redirectForm($current_step);
+	}
+
+
+	/**
+	 * handles where to go to next
+	 *
+	 * @param SequentialStepFormInterface $current_step
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidFormHandlerException
+	 */
+	public function redirectForm(SequentialStepFormInterface $current_step)
+	{
+		$redirect_step = $current_step;
+		switch ($current_step->redirectTo()) {
+			case SequentialStepForm::REDIRECT_TO_OTHER:
+				// going somewhere else, so just check out now
+				wp_safe_redirect($redirect_step->redirectUrl());
+				exit();
+			case SequentialStepForm::REDIRECT_TO_PREV_STEP:
+				$redirect_step = $this->form_steps->previous();
+				break;
+			case SequentialStepForm::REDIRECT_TO_NEXT_STEP:
+				$this->form_steps->next();
+				if ($this->form_steps->valid()) {
+					$redirect_step = $this->form_steps->current();
+				}
+				break;
+			case SequentialStepForm::REDIRECT_TO_CURRENT_STEP:
+			default:
+				// $redirect_step is already set
+		}
+		$current_step->setRedirectUrl($this->baseUrl());
+		$current_step->addRedirectArgs(
+			// use the slug for whatever step we are redirecting too
+			array($this->formStepUrlKey() => $redirect_step->slug())
+		);
+		wp_safe_redirect($current_step->redirectUrl());
+		exit();
+	}
 }