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authorAkshay <[email protected]>2021-10-27 15:20:52 +0100
committerAkshay <[email protected]>2021-10-27 20:03:48 +0100
commit8eccf15964e09c2e024710512e671c6b1b88e885 (patch)
treeda902a799840c3031f2ca68e3be39e3f101b05eb /lib/src/lints/empty_pattern.rs
parentf909b20c540ea99dddfd04b8439ee35b8dd703b8 (diff)
add 3 new lints, bump to v0.2.3v0.2.3
- empty_pattern - redundant_pattern_bind - unquoted_splice
Diffstat (limited to 'lib/src/lints/empty_pattern.rs')
-rw-r--r--lib/src/lints/empty_pattern.rs37
1 files changed, 37 insertions, 0 deletions
diff --git a/lib/src/lints/empty_pattern.rs b/lib/src/lints/empty_pattern.rs
new file mode 100644
index 0000000..6fb7558
--- /dev/null
+++ b/lib/src/lints/empty_pattern.rs
@@ -0,0 +1,37 @@
1use crate::{make, Lint, Metadata, Report, Rule, Suggestion};
2
3use if_chain::if_chain;
4use macros::lint;
5use rnix::{
6 types::{Pattern, TypedNode},
7 NodeOrToken, SyntaxElement, SyntaxKind,
8};
9
10#[lint(
11 name = "empty pattern",
12 note = "Found empty pattern in function argument",
13 code = 10,
14 match_with = SyntaxKind::NODE_PATTERN
15)]
16struct EmptyPattern;
17
18impl Rule for EmptyPattern {
19 fn validate(&self, node: &SyntaxElement) -> Option<Report> {
20 if_chain! {
21 if let NodeOrToken::Node(node) = node;
22 if let Some(pattern) = Pattern::cast(node.clone());
23 // no patterns within `{ }`
24 if pattern.entries().count() == 0;
25 // pattern is not bound
26 if pattern.at().is_none();
27 then {
28 let at = node.text_range();
29 let message = "This pattern is empty, use `_` instead";
30 let replacement = make::ident("_").node().clone();
31 Some(Self::report().suggest(at, message, Suggestion::new(at, replacement)))
32 } else {
33 None
34 }
35 }
36 }
37}