Error: [ANTLR_027]: Encountered recursive node without a parent node during processing

[chopperoon]

When wrapping the toc tag within any if statement, I'm seeing an error [ANTLR_027]: Encountered recursive node without a parent node during processing, in reference to the {{ *recursive children* }} line. (I need to allow editors to decide if they wish to include the TOC, hence the need for an if statement).)

Here's my test code:

{{ if 2 > 1 }}
    <ol>
    {{ toc field="content" }}
        <li>
            <a href="#{{ toc_id }}">{{ toc_title }}</a>
            {{ if children }}
            <ol>
                {{ *recursive children* }}
            </ol>
            {{ /if }}
        </li>
    {{ /toc }}
    </ol>
{{ /if }}

Aside from this, the add-on is exactly what I need ;)

Do you have any suggestions on how to resolve this? I'm using statamic-toc 1.7 on Statamic 5.69.

[goldnead]

Thanks for this. I can reproduce it. This is an error that came with the new runtime antlers parser, I wonder why noone encountered this previously.

The error occurs because I use the magic tag {{ *recursive children }}. With that and a wrapping '{{ if }}` that the parser is getting confused which scope to use.

There are two workarounds: One is an additional "when" parameter, that you can use on the tag itself, instead of a wrapping if tag. This is something that will be released tomorrow in a new release of the addon.

Another workaround would be to use a separate partial that references itself for the items without the magic-recursion tag:

{{ if 2 > 1 }}
    <ol>
        {{ toc field="content" }}
            {{ partial:toc_item }}
        {{ /toc }}
    </ol>
{{ /if }}

Partial:

<li>
    <a href="#{{ toc_id }}">{{ toc_title }}</a>
    {{ if children }}
        <ol>
            {{ children }}
                {{ partial:toc_item }}
            {{ /children }}
        </ol>
    {{ /if }}
</li>

If you can wait a day, you would be able to use it like this:

{{ $condition = 2 > 1 }}
{{ toc :when="$condition" content="{bard_content}" }}
    {{ if count > 0 }}
        <div class="max-w-md mx-auto">
            <div class="text-2xl font-bold">Table Of Contents</div>
            <div class="py-4 text-base text-gray-700 sm:text-lg">
                <ol class="list-decimal list-inside space-y-2">
                    <li>
                        <a class="font-bold text-cyan-800" href="#{{ toc_id }}">{{ toc_title }}</a>
                        {{ if children }}
                        <ol>
                            {{ *recursive children* }}
                        </ol>
                        {{ /if }}
                    </li>
                </ol>
            </div>
        </div>
    {{ /if }}
{{ /toc }}

Hope this helps :)

[chopperoon]

Fantastic, thanks so much for the quick reply — much appreciated. I can certainly wait for the next release ;)

[chopperoon]

Hi there, I've tried using the nested partial workaround but this is causing timeouts any time the depth is enough to require the partial to call itself. Do you have any ETA on the next release which will allow the new when parameter to be used?

[goldnead]

Hey @chopperoon,
Sorry, I got delayed. I will patch it in the coming week! If your like, You can try with the pr #29 to see if it works.

[chopperoon]

Hi, I've patched in the PR but I'm not able to get it working as expected. The $condition doesn't seem to be respected when passed to the when parameter. As a test, asking toc to run when 1 > 2 results in the TOC still showing.

{{ $condition = 1 > 2 }}
    <ol>
    {{ toc :when="$condition" field="content" from="h2" depth="3" }}
        <li>
            <a href="#{{ toc_id }}">{{ toc_title }}</a>
            {{ if children }}
            <ol>
                {{ *recursive children* }}
            </ol>
            {{ /if }}
        </li>
    {{ /toc }}
</ol>

The original [Error: [ANTLR_027]] is no longer triggered, but I can't get the when condition to work. Any help much appreciated!