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This commit is contained in:
Aleksey Kladov 2020-07-14 11:09:41 +02:00
parent 45ec95caf6
commit 7b2ce1a54f
1 changed files with 82 additions and 84 deletions
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48
crates/ra_hir_ty/src/diagnostics/match_check.rs
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@ -272,7 +272,7 @@ impl From<&PatId> for PatIdOrWild {
} }
#[derive(Debug, Clone, Copy, PartialEq)] #[derive(Debug, Clone, Copy, PartialEq)]
pub enum MatchCheckErr { pub(super) enum MatchCheckErr {
NotImplemented, NotImplemented,
MalformedMatchArm, MalformedMatchArm,
/// Used when type inference cannot resolve the type of /// Used when type inference cannot resolve the type of
@ -287,21 +287,21 @@ pub enum MatchCheckErr {
/// ///
/// The `std::result::Result` type is used here rather than a custom enum /// The `std::result::Result` type is used here rather than a custom enum
/// to allow the use of `?`. /// to allow the use of `?`.
pub type MatchCheckResult<T> = Result<T, MatchCheckErr>; pub(super) type MatchCheckResult<T> = Result<T, MatchCheckErr>;
#[derive(Debug)] #[derive(Debug)]
/// A row in a Matrix. /// A row in a Matrix.
/// ///
/// This type is modeled from the struct of the same name in `rustc`. /// This type is modeled from the struct of the same name in `rustc`.
pub(crate) struct PatStack(PatStackInner); pub(super) struct PatStack(PatStackInner);
type PatStackInner = SmallVec<[PatIdOrWild; 2]>; type PatStackInner = SmallVec<[PatIdOrWild; 2]>;
impl PatStack { impl PatStack {
pub(crate) fn from_pattern(pat_id: PatId) -> PatStack { pub(super) fn from_pattern(pat_id: PatId) -> PatStack {
Self(smallvec!(pat_id.into())) Self(smallvec!(pat_id.into()))
} }
pub(crate) fn from_wild() -> PatStack { pub(super) fn from_wild() -> PatStack {
Self(smallvec!(PatIdOrWild::Wild)) Self(smallvec!(PatIdOrWild::Wild))
} }
@ -510,14 +510,14 @@ impl PatStack {
/// A collection of PatStack. /// A collection of PatStack.
/// ///
/// This type is modeled from the struct of the same name in `rustc`. /// This type is modeled from the struct of the same name in `rustc`.
pub(crate) struct Matrix(Vec<PatStack>); pub(super) struct Matrix(Vec<PatStack>);
impl Matrix { impl Matrix {
pub(crate) fn empty() -> Self { pub(super) fn empty() -> Self {
Self(vec![]) Self(vec![])
} }
pub(crate) fn push(&mut self, cx: &MatchCheckCtx, row: PatStack) { pub(super) fn push(&mut self, cx: &MatchCheckCtx, row: PatStack) {
if let Some(Pat::Or(pat_ids)) = row.get_head().map(|pat_id| pat_id.as_pat(cx)) { if let Some(Pat::Or(pat_ids)) = row.get_head().map(|pat_id| pat_id.as_pat(cx)) {
// Or patterns are expanded here // Or patterns are expanded here
for pat_id in pat_ids { for pat_id in pat_ids {
@ -579,16 +579,16 @@ impl Matrix {
/// not matched by an prior match arms. /// not matched by an prior match arms.
/// ///
/// We may eventually need an `Unknown` variant here. /// We may eventually need an `Unknown` variant here.
pub enum Usefulness { pub(super) enum Usefulness {
Useful, Useful,
NotUseful, NotUseful,
} }
pub struct MatchCheckCtx<'a> { pub(super) struct MatchCheckCtx<'a> {
pub match_expr: Idx<Expr>, pub(super) match_expr: Idx<Expr>,
pub body: Arc<Body>, pub(super) body: Arc<Body>,
pub infer: Arc<InferenceResult>, pub(super) infer: Arc<InferenceResult>,
pub db: &'a dyn HirDatabase, pub(super) db: &'a dyn HirDatabase,
} }
/// Given a set of patterns `matrix`, and pattern to consider `v`, determines /// Given a set of patterns `matrix`, and pattern to consider `v`, determines
@ -599,7 +599,7 @@ pub struct MatchCheckCtx<'a> {
/// expected that you have already type checked the match arms. All patterns in /// expected that you have already type checked the match arms. All patterns in
/// matrix should be the same type as v, as well as they should all be the same /// matrix should be the same type as v, as well as they should all be the same
/// type as the match expression. /// type as the match expression.
pub(crate) fn is_useful( pub(super) fn is_useful(
cx: &MatchCheckCtx, cx: &MatchCheckCtx,
matrix: &Matrix, matrix: &Matrix,
v: &PatStack, v: &PatStack,
@ -837,23 +837,23 @@ fn enum_variant_matches(cx: &MatchCheckCtx, pat_id: PatId, enum_variant_id: Enum
#[cfg(test)] #[cfg(test)]
mod tests { mod tests {
pub(super) use insta::assert_snapshot; use insta::assert_snapshot;
pub(super) use ra_db::fixture::WithFixture; use ra_db::fixture::WithFixture;
pub(super) use crate::{diagnostics::MissingMatchArms, test_db::TestDB}; use crate::{diagnostics::MissingMatchArms, test_db::TestDB};
pub(super) fn check_diagnostic_message(ra_fixture: &str) -> String { fn check_diagnostic_message(ra_fixture: &str) -> String {
TestDB::with_single_file(ra_fixture).0.diagnostic::<MissingMatchArms>().0 TestDB::with_single_file(ra_fixture).0.diagnostic::<MissingMatchArms>().0
} }
pub(super) fn check_diagnostic(ra_fixture: &str) { fn check_diagnostic(ra_fixture: &str) {
let diagnostic_count = let diagnostic_count =
TestDB::with_single_file(ra_fixture).0.diagnostic::<MissingMatchArms>().1; TestDB::with_single_file(ra_fixture).0.diagnostic::<MissingMatchArms>().1;
assert_eq!(1, diagnostic_count, "no diagnostic reported"); assert_eq!(1, diagnostic_count, "no diagnostic reported");
} }
pub(super) fn check_no_diagnostic(ra_fixture: &str) { fn check_no_diagnostic(ra_fixture: &str) {
let (s, diagnostic_count) = let (s, diagnostic_count) =
TestDB::with_single_file(ra_fixture).0.diagnostic::<MissingMatchArms>(); TestDB::with_single_file(ra_fixture).0.diagnostic::<MissingMatchArms>();
@ -2036,9 +2036,7 @@ mod tests {
", ",
); );
} }
}
#[cfg(test)]
mod false_negatives { mod false_negatives {
//! The implementation of match checking here is a work in progress. As we roll this out, we //! The implementation of match checking here is a work in progress. As we roll this out, we
//! prefer false negatives to false positives (ideally there would be no false positives). This //! prefer false negatives to false positives (ideally there would be no false positives). This
@ -2049,8 +2047,7 @@ mod false_negatives {
//! //!
//! 1. It acts as a backlog of work that can be done to improve the behavior of the system. //! 1. It acts as a backlog of work that can be done to improve the behavior of the system.
//! 2. It ensures the code doesn't panic when handling these cases. //! 2. It ensures the code doesn't panic when handling these cases.
use super::*;
use super::tests::*;
#[test] #[test]
fn integers() { fn integers() {
@ -2156,3 +2153,4 @@ mod false_negatives {
); );
} }
} }
}