Support `or` operator in `case`/`when` tags

[TheLastZombie]

Checklist

• I have searched the issue list
• I have tested my example against Shopify Liquid. (This isn't necessary if the actual behavior is a panic, or an error for which IsTemplateError returns false.)

Expected Behavior

The following Liquid template:

{% case 1 %}{% when 1 or 2 %}{% endcase %}

Throws an error:

Liquid error: syntax error in "{%when 1 or 2" in {% case 1 %}

Actual Behavior

There should not be an error and the result should be the same as parsing the following template:

{% case 1 %}{% when 1, 2 %}{% endcase %}

Detailed Description

According to the Liquid documentation, there are two ways to separate multiple values with the same expression in a case tag:

Provide the values as a comma-separated list, or separate them using an or operator.

This package already supports the former, but the latter throws an error (see above or Go Playground example).

Possible Solution

The when tag parser would have to treat or in the same way as , .

[pierre-b]

feel free to check https://github.com/Notifuse/liquidgo