Struct Graph 

pub struct Graph { /* private fields */ }

A built, type-checked DAG. Tile-independent; build once per style and evaluate many times.

Implementations

impl Graph

pub fn len(&self) -> usize

Number of nodes.

pub fn is_empty(&self) -> bool

pub fn output(&self) -> NodeIx

pub fn topo_order(&self) -> &[NodeIx]

Topological order; output node is last.

pub fn asset_inputs(&self) -> BTreeSet<String>

The union of every node’s Node::asset_inputs, deduplicated and ordered. A host consults this to learn which named bindings the document’s graph samples — including the @<dx>,<dy> neighbour names (see crate::neighbor) a cross-tile node requests, so it can fetch and bind exactly the neighbour tiles the graph needs rather than the whole 3×3 window unconditionally.

pub fn node(&self, ix: NodeIx) -> &dyn Node

pub fn node_id(&self, ix: NodeIx) -> &str

pub fn index_of(&self, id: &str) -> Option<NodeIx>

Look up a node’s index by id.

pub fn upstream(&self, ix: NodeIx) -> impl Iterator<Item = NodeIx> + '_

Upstream nodes feeding ix, deduplicated.

pub fn downstream(&self, ix: NodeIx) -> &[NodeIx]

Downstream nodes consuming ix’s output (may contain duplicates if the same node connects multiple of its input ports to ix).

pub fn downstream_unique(&self, ix: NodeIx) -> &[NodeIx]

Distinct downstream nodes consuming ix’s output, each listed once.

pub fn indegree(&self, ix: NodeIx) -> usize

Number of distinct upstream nodes feeding ix (0 for sources).

pub fn incoming(&self, ix: NodeIx, port_ix: usize) -> Option<NodeIx>

The source feeding node.inputs()[port_ix], if connected.

pub fn output_kind(&self, ix: NodeIx) -> PortKind

Resolved output PortKind for ix. Decided at build time; polymorphic nodes’ kind is fixed once the graph is built.

pub fn compute_pad(&self, doc_pad: u32) -> Result<Vec<u32>, BuildError>

Compute the canvas padding each node must supply, given the document-level pad requested at the output.

Trait Implementations

impl Debug for Graph

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

Formats the value using the given formatter.