Custom each does not support `as | a index |` syntax

[willdkp]

The PHP Code:

 $helpers = array(
'myeach' => function ($context, $options) {
    $ret = '';

    $theArray = json_decode($context, true);
    
    if(!is_array($theArray)) {
        return '';
    }
    
    foreach ($theArray as $i) {
        $ret .= $options['fn']($i);
    }
    return $ret;
},
);

$options = array(  
    'flags' => LightnCandy::FLAG_ERROR_LOG | LightnCandy::FLAG_STANDALONEPHP | LightnCandy::FLAG_HANDLEBARSJS | LightnCandy::FLAG_ADVARNAME | LightnCandy::FLAG_SPVARS | LightnCandy::FLAG_PARENT | LightnCandy::FLAG_JSTRUE | LightnCandy::FLAG_JSOBJECT,  
    'helpers' => $helpers
);  
  
$php = LightnCandy::compile($template, $options);  
$renderer = LightnCandy::prepare($php);  

$handlebarsOutput = $renderer($config);  

Template:

{{#myeach '[{"a":"ayy", "b":"bee"},{"a":"zzz", "b":"ccc"}]' as | newContext index | }} 
Foo {{newContext.a}} {{index}}
 {{/myeach}}

The Issue:

As in the example I have a custom each helper. When I attempt to use the as | value index| syntax as described in handlebars documentation it does not work. this will return the object that was pulled from the JSON okay, but newContext and index print nothing. Such that the rendered output is simply Foo Foo

Do I need additional flags to enable this? What am I doing wrong here?

[theodorejb]

In order for this to work the block parameters have to be explicitly passed to the fn() block renderer. This can be done with PHP Handlebars as follows:

use DevTheorem\Handlebars\{Handlebars, HelperOptions};

$helpers = [
    'myeach' => function ($context, HelperOptions $options) {
        $theArray = json_decode($context, true);
        if (!is_array($theArray)) {
            return '';
        }

        $ret = '';
        foreach ($theArray as $i => $value) {
            $ret .= $options->fn([], ['blockParams' => [$value, $i]]);
        }
        return $ret;
    },
];

$templateStr = "{{#myeach json as |newContext index|}}Foo {{newContext.a}} {{index}}\n{{/myeach}}";
$template = Handlebars::compile($templateStr);

$context = ['json' => '[{"a":"ayy", "b":"bee"},{"a":"zzz", "b":"ccc"}]'];
echo $template($context, ['helpers' => $helpers]);

Output:

Foo ayy 0
Foo zzz 1

This matches the API in Handlebars.js (playground demo).