Allow variables to use multiple modifiers

[helmi-pts]

Description of the problem

JSON Variable Modifiers does not parse / ignore file field with image manipulation; instead it will only output the original file url

How To Reproduce

1. Create a file field
2. Create any setting for Constrain or Crop in the File Manager page
3. Upload file
4. Parse template using:
   {your_file_field:json}
{your_file_field:your_crop:json}

Error Messages

No error message. Instead it will output both tags value as the original file name url.

Environment Details:

• Version: [e.g. 5.1.3]
• PHP Version [e.g. 7.2]
• MySQL Version [e.g. 5.7]
• OS: [e.g. Linux]
• Web Server: [Apache]

Possible Solution

Additional context

[kevincupp]

This is because your_crop is a modifier and json is a modifier, and you currently cannot have more than one modifier on a variable. If this specific use case is to be fixed, then that fundamental change needs to be made to the template parser.

[aasun]

Definitely would love being able to use more than 1 modifier on a variable. Specific scenario:

I want to use :attr_safe to remove HTML tags from a string to display it as plain text. But, when the BR tags are removed, there are no spaces between those words.. So, I want to do a :replace to first replace any BRs with a space character, then :attr_safe to remove the remaining HTML, resulting in a plain text string.

Alternatively, maybe add more options to the existing modifiers so we can do more with them.