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Replace stripped derives with whitespace in process_macro_input

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This commit is contained in:
Lukas Wirth 2021-08-22 01:43:28 +02:00
parent 8cd171cd94
commit 5507512eaf
1 changed files with 23 additions and 10 deletions
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33
crates/hir_expand/src/input.rs
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@ -40,7 +40,7 @@ fn remove_derives_up_to(item: ast::Item, attr_index: usize) -> ast::Item {
attr.path().and_then(|path| path.as_single_segment()).and_then(|seg| seg.name_ref())
{
if name.as_name() == name![derive] {
attr.syntax().detach();
replace_attr(&item, &attr);
}
}
}
@ -54,10 +54,14 @@ fn remove_attr_invoc(item: ast::Item, attr_index: usize) -> ast::Item {
.attrs()
.nth(attr_index)
.unwrap_or_else(|| panic!("cannot find attribute #{}", attr_index));
replace_attr(&item, &attr);
item
}
fn replace_attr(item: &ast::Item, attr: &ast::Attr) {
let syntax_index = attr.syntax().index();
let ws = make::tokens::whitespace(&" ".repeat(u32::from(attr.syntax().text().len()) as usize));
item.syntax().splice_children(syntax_index..syntax_index + 1, vec![ws.into()]);
item
}
#[cfg(test)]
@ -78,7 +82,9 @@ mod tests {
assert_eq!(items.len(), 1);
let item = remove_derives_up_to(items.pop().unwrap(), attr);
expect.assert_eq(&item.to_string());
let res: String =
item.syntax().children_with_tokens().map(|e| format!("{:?}\n", e)).collect();
expect.assert_eq(&res);
}
#[test]
@ -95,13 +101,20 @@ struct A {
}
"#,
expect![[r#"
#[allow(unused)]
#[derive(Clone)]
struct A {
bar: u32
}"#]],
Node(ATTR@0..16)
Token(WHITESPACE@16..17 "\n")
Token(WHITESPACE@17..32 " ")
Token(WHITESPACE@32..33 "\n")
Token(WHITESPACE@33..49 " ")
Token(WHITESPACE@49..50 "\n")
Node(ATTR@50..66)
Token(WHITESPACE@66..67 "\n")
Token(STRUCT_KW@67..73 "struct")
Token(WHITESPACE@73..74 " ")
Node(NAME@74..75)
Token(WHITESPACE@75..76 " ")
Node(RECORD_FIELD_LIST@76..92)
"#]],
);
}
}