Feature Request: Expose AST Root Node to Enable Custom NodeVisitor Implementation

[Ryokki]

I am using Pebble version 3.2.2.

My goal is to implement a custom NodeVisitor for static analysis, such as collecting all variable names used within a template.

Pebble provides the NodeVisitor interface, which is perfect for this. However, there is no public API to access the AST's root node from a compiled PebbleTemplate. The implementation class, PebbleTemplateImpl, holds rootNode as a private field without a public getter.

This makes it impossible to initiate the AST traversal (i.e., rootNode.accept(myVisitor)), preventing the use of custom visitors.

To enable this powerful feature, could you please consider adding a public getter for the root node to PebbleTemplateImpl?

[seriouswebby]

I was wanting to do the same thing, i did find this i was thinking of using (based on ANTLR4) from the IntelliJ Pebble plugin: https://github.com/bjansen/pebble-intellij/blob/master/parser/src/main/antlr/com/github/bjansen/pebble/parser/PebbleParser.g4

ANTLR4 you can generate a visitor or a listener (or both!), but would be great to use Pebble directly

[ebussieres]

You're welcome to create a PR for this