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Add TokenId Shif in macro_rules

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This commit is contained in:
Edwin Cheng 2019-11-04 23:22:18 +08:00
parent f9f1effd01
commit 04af290d4e
2 changed files with 74 additions and 2 deletions
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27
crates/ra_mbe/src/tests.rs
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@ -58,6 +58,33 @@ mod rule_parsing {
// * Port the test to rust and add it to this module
// * Make it pass :-)
#[test]
fn test_token_id_shift() {
let macro_definition = r#"
macro_rules! foobar {
($e:ident) => { foo bar $e }
}
"#;
let rules = create_rules(macro_definition);
let expansion = expand(&rules, "foobar!(baz);");
fn get_id(t: &tt::TokenTree) -> Option<u32> {
if let tt::TokenTree::Leaf(tt::Leaf::Ident(ident)) = t {
return Some(ident.id.0);
}
None
}
assert_eq!(expansion.token_trees.len(), 3);
// ($e:ident) => { foo bar $e }
// 0 1 2 3 4
assert_eq!(get_id(&expansion.token_trees[0]), Some(2));
assert_eq!(get_id(&expansion.token_trees[1]), Some(3));
// So baz should be 5
assert_eq!(get_id(&expansion.token_trees[2]), Some(5));
}
#[test]
fn test_convert_tt() {
let macro_definition = r#"