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https://github.com/rust-lang/rust-clippy
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lint on implementing visit_string
without also implementing visit_str
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6 changed files with 101 additions and 1 deletions
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@ -246,6 +246,7 @@ All notable changes to this project will be documented in this file.
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[`result_unwrap_used`]: https://github.com/Manishearth/rust-clippy/wiki#result_unwrap_used
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[`reverse_range_loop`]: https://github.com/Manishearth/rust-clippy/wiki#reverse_range_loop
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[`search_is_some`]: https://github.com/Manishearth/rust-clippy/wiki#search_is_some
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[`serde_api_misuse`]: https://github.com/Manishearth/rust-clippy/wiki#serde_api_misuse
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[`shadow_reuse`]: https://github.com/Manishearth/rust-clippy/wiki#shadow_reuse
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[`shadow_same`]: https://github.com/Manishearth/rust-clippy/wiki#shadow_same
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[`shadow_unrelated`]: https://github.com/Manishearth/rust-clippy/wiki#shadow_unrelated
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@ -34,6 +34,7 @@ lazy_static = "0.1.15"
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regex = "0.1.71"
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rustc-serialize = "0.3"
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clippy-mini-macro-test = { version = "0.1", path = "mini-macro" }
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serde = "0.7"
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[features]
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@ -17,7 +17,7 @@ Table of contents:
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## Lints
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There are 158 lints included in this crate:
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There are 159 lints included in this crate:
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name | default | meaning
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---------------------------------------------------------------------------------------------------------------------|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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@ -136,6 +136,7 @@ name
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[result_unwrap_used](https://github.com/Manishearth/rust-clippy/wiki#result_unwrap_used) | allow | using `Result.unwrap()`, which might be better handled
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[reverse_range_loop](https://github.com/Manishearth/rust-clippy/wiki#reverse_range_loop) | warn | Iterating over an empty range, such as `10..0` or `5..5`
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[search_is_some](https://github.com/Manishearth/rust-clippy/wiki#search_is_some) | warn | using an iterator search followed by `is_some()`, which is more succinctly expressed as a call to `any()`
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[serde_api_misuse](https://github.com/Manishearth/rust-clippy/wiki#serde_api_misuse) | warn | Various things that will negatively affect your serde experience
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[shadow_reuse](https://github.com/Manishearth/rust-clippy/wiki#shadow_reuse) | allow | rebinding a name to an expression that re-uses the original value, e.g. `let x = x + 1`
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[shadow_same](https://github.com/Manishearth/rust-clippy/wiki#shadow_same) | allow | rebinding a name to itself, e.g. `let mut x = &mut x`
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[shadow_unrelated](https://github.com/Manishearth/rust-clippy/wiki#shadow_unrelated) | allow | The name is re-bound without even using the original value
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@ -114,6 +114,7 @@ pub mod ptr_arg;
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pub mod ranges;
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pub mod regex;
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pub mod returns;
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pub mod serde;
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pub mod shadow;
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pub mod strings;
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pub mod swap;
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@ -167,6 +168,7 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry) {
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store.register_removed("string_to_string", "using `string::to_string` is common even today and specialization will likely happen soon");
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// end deprecated lints, do not remove this comment, it’s used in `update_lints`
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reg.register_late_lint_pass(box serde::Serde);
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reg.register_late_lint_pass(box types::TypePass);
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reg.register_late_lint_pass(box booleans::NonminimalBool);
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reg.register_late_lint_pass(box misc::TopLevelRefPass);
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@ -399,6 +401,7 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry) {
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regex::TRIVIAL_REGEX,
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returns::LET_AND_RETURN,
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returns::NEEDLESS_RETURN,
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serde::SERDE_API_MISUSE,
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strings::STRING_LIT_AS_BYTES,
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swap::ALMOST_SWAPPED,
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swap::MANUAL_SWAP,
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55
clippy_lints/src/serde.rs
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55
clippy_lints/src/serde.rs
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@ -0,0 +1,55 @@
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use rustc::lint::*;
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use rustc::hir::*;
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use utils::{span_lint, get_trait_def_id};
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/// **What it does:** This lint checks for mis-uses of the serde API
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///
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/// **Why is this bad?** Serde is very finnicky about how its API should be used, but the type system can't be used to enforce it (yet)
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///
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/// **Known problems:** None.
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///
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/// **Example:** implementing `Visitor::visit_string` but not `Visitor::visit_str`
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declare_lint! {
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pub SERDE_API_MISUSE, Warn,
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"Various things that will negatively affect your serde experience"
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}
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#[derive(Copy, Clone)]
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pub struct Serde;
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impl LintPass for Serde {
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fn get_lints(&self) -> LintArray {
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lint_array!(SERDE_API_MISUSE)
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}
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}
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impl LateLintPass for Serde {
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fn check_item(&mut self, cx: &LateContext, item: &Item) {
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if let ItemImpl(_, _, _, Some(ref trait_ref), _, ref items) = item.node {
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let did = cx.tcx.expect_def(trait_ref.ref_id).def_id();
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if let Some(visit_did) = get_trait_def_id(cx, &["serde", "de", "Visitor"]) {
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if did == visit_did {
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let mut seen_str = None;
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let mut seen_string = None;
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for item in items {
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match &*item.name.as_str() {
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"visit_str" => seen_str = Some(item.span),
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"visit_string" => seen_string = Some(item.span),
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_ => {},
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}
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}
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if let Some(span) = seen_string {
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if seen_str.is_none() {
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span_lint(cx,
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SERDE_API_MISUSE,
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span,
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"you should not implement `visit_string` without also implementing `visit_str`",
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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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39
tests/compile-fail/serde.rs
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39
tests/compile-fail/serde.rs
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@ -0,0 +1,39 @@
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#![feature(plugin)]
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#![plugin(clippy)]
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#![deny(serde_api_misuse)]
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#![allow(dead_code)]
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extern crate serde;
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struct A;
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impl serde::de::Visitor for A {
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type Value = ();
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fn visit_str<E>(&mut self, _v: &str) -> Result<Self::Value, E>
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where E: serde::Error,
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{
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unimplemented!()
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}
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fn visit_string<E>(&mut self, _v: String) -> Result<Self::Value, E>
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where E: serde::Error,
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{
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unimplemented!()
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}
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}
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struct B;
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impl serde::de::Visitor for B {
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type Value = ();
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fn visit_string<E>(&mut self, _v: String) -> Result<Self::Value, E>
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//~^ ERROR you should not implement `visit_string` without also implementing `visit_str`
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where E: serde::Error,
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{
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unimplemented!()
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}
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}
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fn main() {
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}
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