Getting latte filters to run inside included variable text

madrian

The setup
I am using Markdown files for subpages. These files get loaded and their contents get set into variables inside the Presenter. Then every request gets routed to a single Latte-Template, which is supposed to display the variables. It's a markdown-sub-template-system so to speak.

The question
I would like to be able to place Latte filters inside the markdown text file and have these filters eventually evaluated in the layout.latte. For example consider these steps:

(1) The text is set in the PagePresenter. It includes a latte filter/function.

$vars->pageText = 'Say {="olleH" |reverse} to Latte!';

(2) Defining the main block inside page.latte. Text is placed here without escaping.

{define main}
{$vars->pageText |noescape}
{/define}

(3) The block is then included into @layout.latte

{include main}

I expect to see
Say Hello to Latte!

What I instead see is
Say {="olleH" |reverse} to Latte!

If I place the same code directly into the page.latte it obviously works. But when text from a variable gets printed into the page.latte the Latte engine does not evaluate the filters.

Thanks for any suggestions!

MajklNajt

Hi, this is not possible, you must use string loader for parse template in string

MajklNajt

https://latte.nette.org/en/guide#…

madrian

Thank you very much!
This is the working solution:

$latte = new \Latte\Engine;
$latte->setLoader(new \Latte\Loaders\StringLoader([
    'pageText' => 'Say {="olleH" |reverse} to Latte!'
]));
$vars->pageText = $latte->renderToString('pageText');

madrian

Additional issue:

Linking does not work with the above solution.

# this works

{php echo time()} also
{="olleH" |reverse}

# but this doesn't

<a n:href=Presenter:page>page</a>
# Latte\CompileException Unknown attribute n:href

{link Presenter:page}
# Latte\CompileException Unknown macro {link}

How come? Any suggestions? Thanks!

MajklNajt

you must add provider Nette\Application\LinkGenerator as uiControl:

class YourClassName
{
	private $linkGenerator;

	public function __construct(\Nette\Application\LinkGenerator $linkGenerator)
	{
        $this->linkGenerator = $linkGenerator;
	}

	private function createLatte(): \Latte\Engine
	{
		$latte = new \Latte\Engine;
		$latte->setLoader(new \Latte\Loaders\StringLoader(...));
        $latte->addProvider("uiControl", $this->linkGenerator);
		return $latte;
	}
}

Martk

@MajklNajt 's answer + UI macros installation:

Nette\Bridges\ApplicationLatte\UIMacros::install($latte->getCompiler());

madrian

Working solution:

/** @var \Nette\Application\LinkGenerator @inject */
public $linkGenerator;

private function createLatte(): \Latte\Engine
{
    $latte = new \Latte\Engine;
    $latte->addProvider('uiControl', $this->linkGenerator);
    \Nette\Bridges\ApplicationLatte\UIMacros::install($latte->getCompiler());
	return $latte;
}

Rest like before but with:

$latte = $this->createLatte();

instead of:

$latte = new \Latte\Engine;

Marek Bartoš

To have exactly same posibilities as in presenter/control template, use TemplateFactory

/** @var \Nette\Bridges\ApplicationLatte\TemplateFactory @inject */
public $templateFactory;

private function latteToText(string $latte, ?\Nette\Aplication\UI\Control $control = null): string
{
  $template = $this->templateFactory->createTemplate($control);
  assert($template instanceof \Nette\Bridges\ApplicationLatte\Template);
  $template->getLatte()->setLoader(new \Latte\Loaders\StringLoader());
  return $template->renderToString($latte);
}

Last edited by Mabar (2020-03-11 10:24)

madrian

Thank you @Mabar for this approach.

The following issues arrise:

(1) Injection missing

Nette\DI\MissingServiceException
Service of type Nette\Bridges\ApplicationLatte\TemplateFactory used in @var annotation at App\Presenters\AbstractPresenter::$templateFactory not found. Did you register it in configuration file?

(2) Type issue

latteToText(string $latte expects string, but
new \Latte\Loaders\StringLoader($latte) expexts array|null

Marek Bartoš

It's expected that you have registered Nette\Bridges\ApplicationDI\LatteExtension in DIC. You don't use nette/di? Or nette/bootstrap which should register this extension for you.
Fixed, forgot loader accepts multiple templates. Hope it works now

madrian

It's expected that you have registered Nette\Bridges\ApplicationDI\LatteExtension in DIC.

@Mabar: Well, don't expect to much.

I am unable to get you suggested code to run. Always running into the next exception. So I will stick to the former approach. Maybe your code is the superior approach, but it's not working “out of the box”.