Function chain_depth

src/completion/variable/forward_walk.rs:5836–5861

Recursively compute the dependency chain depth for a variable.

(
    var: &str,
    deps: &HashMap<String, HashSet<String>>,
    cache: &mut HashMap<String, u32>,
    visiting: &mut HashSet<String>,
)

/// Recursively compute the dependency chain depth for a variable.
fn chain_depth(
    var: &str,
    deps: &HashMap<String, HashSet<String>>,
    cache: &mut HashMap<String, u32>,
    visiting: &mut HashSet<String>,
) -> u32 {
    if let Some(&cached) = cache.get(var) {
        return cached;
    }
    if !visiting.insert(var.to_string()) {
        // Cycle detected — break it.
        return 1;
    }
    let depth = if let Some(rhs_vars) = deps.get(var) {
        let mut max_child: u32 = 0;
        for dep in rhs_vars {
            max_child = max_child.max(chain_depth(dep, deps, cache, visiting));
        }
        max_child + 1
    } else {
        1
    };
    visiting.remove(var);
    cache.insert(var.to_string(), depth);
    depth
}

/// Collect assignment dependencies from a statement (cheap AST walk).
fn collect_assignment_deps(stmt: &Statement<'_>, deps: &mut HashMap<String, HashSet<String>>) {