gantz_core 0.1.0

The core types and traits for gantz, an environment for creative systems.
Documentation 
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//! Provides [`visit`](crate::graph::visit) and [`register`] fns for generic
//! gantz graphs.

use crate::{
    Edge,
    node::{self, Node},
    visit,
};
use petgraph::visit::{
    Data, EdgeRef, IntoEdgesDirected, IntoNodeReferences, NodeIndexable, NodeRef, Topo, Visitable,
};
use steel::steel_vm::engine::Engine;

/// Visit all nodes in the graph in toposort order, and all nested nodes in
/// depth-first order.
pub fn visit<G>(g: G, path: &[node::Id], visitor: &mut dyn node::Visitor)
where
    G: Data<EdgeWeight = Edge> + IntoEdgesDirected + IntoNodeReferences + NodeIndexable + Visitable,
    G::NodeWeight: Node,
{
    let mut path = path.to_vec();
    let mut topo = Topo::new(g);
    while let Some(n) = topo.next(g) {
        let ix = g.to_index(n);
        path.push(ix);
        let inputs: Vec<_> = g
            .edges_directed(n, petgraph::Direction::Incoming)
            .map(|e_ref| (g.to_index(e_ref.source()), e_ref.weight().clone()))
            .collect();
        let ctx = visit::Ctx::new(&path, &inputs);

        // FIXME: index directly.
        let nref = g.node_references().find(|nref| nref.id() == n).unwrap();

        node::visit(ctx, nref.weight(), visitor);
        path.pop();
    }
}

/// Register the given graph of nodes, including any nested nodes.
pub fn register<G>(g: G, path: &[node::Id], vm: &mut Engine)
where
    G: Data<EdgeWeight = Edge> + IntoEdgesDirected + IntoNodeReferences + NodeIndexable + Visitable,
    G::NodeWeight: Node,
{
    visit(g, path, &mut visit::Register(vm));
}