neco_nodegraph/
error.rs

1use alloc::string::String;
2use core::fmt;
3
4use crate::id::{EdgeId, NodeId, PortId};
5
6/// Graph operation failures.
7#[derive(Debug, Clone, PartialEq, Eq)]
8pub enum GraphError {
9    EmptyPortId,
10    EmptyTypeTag,
11    NodeNotFound(NodeId),
12    EdgeNotFound(EdgeId),
13    PortNotFound {
14        node: NodeId,
15        port: PortId,
16    },
17    DuplicatePort(PortId),
18    PortDirectionMismatch,
19    TypeTagMismatch {
20        expected: String,
21        actual: String,
22    },
23    SelfLoop,
24    DuplicateEdge,
25    #[cfg(feature = "json")]
26    Json(neco_json::AccessError),
27}
28
29impl fmt::Display for GraphError {
30    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
31        match self {
32            Self::EmptyPortId => f.write_str("port id must not be empty"),
33            Self::EmptyTypeTag => f.write_str("port type_tag must not be empty"),
34            Self::NodeNotFound(id) => write!(f, "node {id} not found"),
35            Self::EdgeNotFound(id) => write!(f, "edge {id} not found"),
36            Self::PortNotFound { node, port } => {
37                write!(f, "port {port} not found on node {node}")
38            }
39            Self::DuplicatePort(port) => write!(f, "duplicate port id {port}"),
40            Self::PortDirectionMismatch => {
41                f.write_str("edge endpoints must connect output to input")
42            }
43            Self::TypeTagMismatch { expected, actual } => {
44                write!(f, "port type mismatch: expected {expected}, got {actual}")
45            }
46            Self::SelfLoop => f.write_str("self-loop edges are not allowed"),
47            Self::DuplicateEdge => f.write_str("duplicate edge is not allowed"),
48            #[cfg(feature = "json")]
49            Self::Json(error) => write!(f, "json access error: {error}"),
50        }
51    }
52}
53
54impl core::error::Error for GraphError {
55    fn source(&self) -> Option<&(dyn core::error::Error + 'static)> {
56        match self {
57            #[cfg(feature = "json")]
58            Self::Json(error) => Some(error),
59            _ => None,
60        }
61    }
62}
63
64#[cfg(feature = "json")]
65impl From<neco_json::AccessError> for GraphError {
66    fn from(value: neco_json::AccessError) -> Self {
67        Self::Json(value)
68    }
69}
neco_nodegraph/error.rs

neco_nodegraph/
error.rs
