Struct NodeCollector 

pub struct NodeCollector { /* private fields */ }

Visitor that collects all nodes of a specific type.

Example

use hedl_core::visitor::{utils::NodeCollector, traverse, TraversalConfig};
use hedl_core::{Document, Node};

let doc = Document::new((1, 0));
let mut collector = NodeCollector::new("User");
traverse(&doc, &mut collector, &TraversalConfig::default());
let users = collector.into_nodes();

Implementations

impl NodeCollector

pub fn new_all() -> Self

Create a collector for all nodes.

pub fn new(type_name: impl Into<String>) -> Self

Create a collector for a specific node type.

pub fn nodes(&self) -> &[Node]

Get the collected nodes.

pub fn into_nodes(self) -> Vec<Node>

Consume the collector and return collected nodes.

pub fn count(&self) -> usize

Get the count of collected nodes.

Trait Implementations

impl Debug for NodeCollector

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Visitor for NodeCollector

fn visit_node( &mut self, node: &Node, _ctx: &VisitorContext<'_>, ) -> VisitDecision

Called when visiting a node (row) in a list.

fn begin_document( &mut self, _doc: &Document, _ctx: &VisitorContext<'_>, ) -> VisitDecision

Called at the start of document traversal.

fn end_document( &mut self, _doc: &Document, _ctx: &VisitorContext<'_>, ) -> VisitDecision

Called at the end of document traversal.

fn visit_scalar( &mut self, _key: &str, _value: &Value, _ctx: &VisitorContext<'_>, ) -> VisitDecision

Called when visiting a scalar value.

fn begin_object( &mut self, _key: &str, _ctx: &VisitorContext<'_>, ) -> VisitDecision

Called before visiting an object’s children.

fn end_object(&mut self, _key: &str, _ctx: &VisitorContext<'_>) -> VisitDecision

Called after visiting an object’s children.

fn begin_list( &mut self, _key: &str, _list: &MatrixList, _ctx: &VisitorContext<'_>, ) -> VisitDecision

Called before visiting a list’s rows.

fn end_list( &mut self, _key: &str, _list: &MatrixList, _ctx: &VisitorContext<'_>, ) -> VisitDecision

Called after visiting a list’s rows.

fn begin_node_children( &mut self, _node: &Node, _ctx: &VisitorContext<'_>, ) -> VisitDecision

Called before visiting a node’s children.

fn end_node_children( &mut self, _node: &Node, _ctx: &VisitorContext<'_>, ) -> VisitDecision

Called after visiting a node’s children.

fn visit_reference( &mut self, _reference: &Reference, _ctx: &VisitorContext<'_>, ) -> VisitDecision

Called when visiting a reference value.

fn visit_expression( &mut self, _expr: &Expression, _ctx: &VisitorContext<'_>, ) -> VisitDecision

Called when visiting an expression value.

fn visit_tensor( &mut self, _tensor: &Tensor, _ctx: &VisitorContext<'_>, ) -> VisitDecision

Called when visiting a tensor value.