zrx_graph/graph/
macros.rs

1// Copyright (c) 2025-2026 Zensical and contributors
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23
24// ----------------------------------------------------------------------------
25
26//! Macros for graph creation.
27
28// ----------------------------------------------------------------------------
29// Macros
30// ----------------------------------------------------------------------------
31
32/// Creates a graph builder from the given pairs.
33///
34/// This macro creates a [`Builder`][] and adds nodes and edges based on the
35/// provided source-target pairs. It's primarily intended for use in tests and
36/// examples to quickly set up graphs, and is not optimized for performance.
37/// Additionally, the node type must implement [`Copy`].
38///
39/// [`Builder`]: crate::graph::Builder
40///
41/// # Examples
42///
43/// ```
44/// use zrx_graph::graph_builder;
45///
46/// // Create graph builder from pairs
47/// let builder = graph_builder! {
48///     "a" => "b", "a" => "c",
49///     "b" => "c",
50/// };
51/// ```
52#[macro_export]
53macro_rules! graph_builder {
54    ($($source:expr => $target:expr),+ $(,)?) => {{
55        let mut builder = $crate::Graph::builder();
56        let mut nodes = std::collections::BTreeMap::new();
57        $(
58            nodes.entry($source).or_insert_with(|| builder.add_node($source));
59            nodes.entry($target).or_insert_with(|| builder.add_node($target));
60        )*
61        $(
62            let _ = builder.add_edge(nodes[$source], nodes[$target], ());
63        )*
64        builder
65    }};
66}
67
68/// Creates a graph from the given pairs.
69///
70/// This macro creates a [`Graph`][] and adds nodes and edges based on the
71/// provided source-target pairs. It's primarily intended for use in tests and
72/// examples to quickly set up graphs, and is not optimized for performance.
73/// Additionally, the node type must implement [`Copy`].
74///
75/// In case you need a [`Builder`][], e.g. to inspect the graph before building
76/// or to print it to DOT format, use the [`graph_builder!`][] macro.
77///
78/// [`Builder`]: crate::graph::Builder
79/// [`Graph`]: crate::graph::Graph
80///
81/// # Examples
82///
83/// ```
84/// use zrx_graph::graph;
85///
86/// // Create graph from pairs
87/// let graph = graph! {
88///     "a" => "b", "a" => "c",
89///     "b" => "c",
90/// };
91/// ```
92#[macro_export]
93macro_rules! graph {
94    ($($source:expr => $target:expr),+ $(,)?) => {{
95        $crate::graph_builder!($($source => $target),+).build()
96    }};
97}
zrx_graph/graph/macros.rs

zrx_graph/graph/
macros.rs
