Method flush_value_refs

codegraph-kernel/src/python.rs:840–944

(&mut self, root: Node<'t>)

    // --- value refs -------------------------------------------------------------------

    fn flush_value_refs(&mut self, root: Node<'t>) {
        let scopes = std::mem::take(&mut self.value_scopes);
        let mut targets = std::mem::take(&mut self.fs_values);
        let counts = std::mem::take(&mut self.fs_value_counts);
        if std::env::var("CODEGRAPH_VALUE_REFS").as_deref() == Ok("0") {
            return;
        }
        if targets.is_empty() || scopes.is_empty() || util::is_generated_file(self.file_path) {
            return;
        }

        // Shadow prune — python's declarator shape is `assignment`.
        let mut decl_counts: HashMap<&str, u32> = HashMap::new();
        let mut dstack: Vec<Node> = vec![root];
        let mut dvisited = 0usize;
        while let Some(n) = dstack.pop() {
            if dvisited >= MAX_VALUE_REF_NODES {
                break;
            }
            dvisited += 1;
            if n.kind() == "assignment" {
                let left = n
                    .child_by_field_name("left")
                    .or_else(|| n.child_by_field_name("pattern"))
                    .or_else(|| n.named_child(0));
                if let Some(left) = left {
                    if left.kind() == "identifier" {
                        let nm = self.text(left);
                        if targets.contains_key(nm) {
                            *decl_counts.entry(nm).or_insert(0) += 1;
                        }
                    } else {
                        for i in 0..left.named_child_count() {
                            if let Some(c) = left.named_child(i) {
                                if c.kind() == "identifier" {
                                    let nm = self.text(c);
                                    if targets.contains_key(nm) {
                                        *decl_counts.entry(nm).or_insert(0) += 1;
                                    }
                                }
                            }
                        }
                    }
                }
            }
            for i in 0..n.named_child_count() {
                if let Some(c) = n.named_child(i) {
                    dstack.push(c);
                }
            }
        }
        let shadowed: Vec<String> = decl_counts
            .iter()
            .filter(|(nm, c)| **c > counts.get(**nm).copied().unwrap_or(1))
            .map(|(nm, _)| nm.to_string())
            .collect();
        for nm in shadowed {
            targets.remove(&nm);