Module visit 

Generic AST visitor used by the linter, formatter, and any other crate that needs to walk every SNode in a parsed program.

Centralizing this here keeps a single source of truth for which children each Node variant has — adding a new variant requires one edit (in walk_children) and every consumer benefits.

Usage

use harn_parser::visit::walk_program;
let mut count = 0;
walk_program(&program, &mut |node| {
    if matches!(&node.node, harn_parser::Node::FunctionCall { .. }) {
        count += 1;
    }
});

The visitor invokes the closure on each node before recursing into its children (pre-order). To stop recursion at a particular node, prefer using walk_children directly.

Functions

walk_children

Recurse into node’s children without re-visiting node itself. Useful when a caller wants to handle the parent specially and then continue the default traversal.

walk_node

Visit node, then recurse into its children.

walk_program

Walk every node in program in pre-order, invoking visitor on each.