103 lines
3.8 KiB
Rust
103 lines
3.8 KiB
Rust
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// run-pass
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#![feature(macro_metavar_expr)]
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#[derive(Debug)]
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struct Example<'a> {
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_indexes: &'a [(u32, u32)],
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_counts: &'a [u32],
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_nested: Vec<Example<'a>>,
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}
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macro_rules! example {
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( $( [ $( ( $( $x:ident )* ) )* ] )* ) => {
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Example {
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_indexes: &[],
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_counts: &[${count(x, 0)}, ${count(x, 1)}, ${count(x, 2)}],
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_nested: vec![
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$(
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Example {
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_indexes: &[(${index()}, ${length()})],
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_counts: &[${count(x, 0)}, ${count(x, 1)}],
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_nested: vec![
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$(
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Example {
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_indexes: &[(${index(1)}, ${length(1)}), (${index()}, ${length()})],
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_counts: &[${count(x)}],
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_nested: vec![
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$(
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Example {
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_indexes: &[
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(${index(2)}, ${length(2)}),
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(${index(1)}, ${length(1)}),
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(${index()}, ${length()})
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],
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_counts: &[],
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_nested: vec![],
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${ignore(x)}
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}
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),*
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]
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}
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),*
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]
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}
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),*
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]
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}
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};
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}
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static EXPECTED: &str = concat!(
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"Example { _indexes: [], _counts: [2, 4, 13], _nested: [",
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concat!(
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"Example { _indexes: [(0, 2)], _counts: [3, 10], _nested: [",
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concat!(
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"Example { _indexes: [(0, 2), (0, 3)], _counts: [4], _nested: [",
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concat!(
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"Example { _indexes: [(0, 2), (0, 3), (0, 4)], _counts: [], _nested: [] }, ",
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"Example { _indexes: [(0, 2), (0, 3), (1, 4)], _counts: [], _nested: [] }, ",
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"Example { _indexes: [(0, 2), (0, 3), (2, 4)], _counts: [], _nested: [] }, ",
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"Example { _indexes: [(0, 2), (0, 3), (3, 4)], _counts: [], _nested: [] }",
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),
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"] }, ",
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"Example { _indexes: [(0, 2), (1, 3)], _counts: [4], _nested: [",
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concat!(
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"Example { _indexes: [(0, 2), (1, 3), (0, 4)], _counts: [], _nested: [] }, ",
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"Example { _indexes: [(0, 2), (1, 3), (1, 4)], _counts: [], _nested: [] }, ",
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"Example { _indexes: [(0, 2), (1, 3), (2, 4)], _counts: [], _nested: [] }, ",
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"Example { _indexes: [(0, 2), (1, 3), (3, 4)], _counts: [], _nested: [] }",
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),
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"] }, ",
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"Example { _indexes: [(0, 2), (2, 3)], _counts: [2], _nested: [",
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concat!(
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"Example { _indexes: [(0, 2), (2, 3), (0, 2)], _counts: [], _nested: [] }, ",
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"Example { _indexes: [(0, 2), (2, 3), (1, 2)], _counts: [], _nested: [] }",
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),
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"] }",
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),
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"] }, ",
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"Example { _indexes: [(1, 2)], _counts: [1, 3], _nested: [",
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concat!(
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"Example { _indexes: [(1, 2), (0, 1)], _counts: [3], _nested: [",
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concat!(
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"Example { _indexes: [(1, 2), (0, 1), (0, 3)], _counts: [], _nested: [] }, ",
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"Example { _indexes: [(1, 2), (0, 1), (1, 3)], _counts: [], _nested: [] }, ",
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"Example { _indexes: [(1, 2), (0, 1), (2, 3)], _counts: [], _nested: [] }",
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),
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"] }",
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),
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"] }",
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),
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"] }",
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);
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fn main() {
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let e = example! {
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[ ( A B C D ) ( E F G H ) ( I J ) ]
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[ ( K L M ) ]
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};
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let debug = format!("{:?}", e);
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assert_eq!(debug, EXPECTED);
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}
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