1 files changed, 359 insertions, 0 deletions

diff --git a/crates/hir_ty/src/tests.rs b/crates/hir_ty/src/tests.rs
new file mode 100644
index 000000000..c953925ec
--- /dev/null
+++ b/crates/hir_ty/src/tests.rs
@@ -0,0 +1,359 @@
+mod never_type;
+mod coercion;
+mod regression;
+mod simple;
+mod patterns;
+mod traits;
+mod method_resolution;
+mod macros;
+mod display_source_code;
+
+use std::sync::Arc;
+
+use base_db::{fixture::WithFixture, FileRange, SourceDatabase, SourceDatabaseExt};
+use expect::Expect;
+use hir_def::{
+    body::{BodySourceMap, SyntheticSyntax},
+    child_by_source::ChildBySource,
+    db::DefDatabase,
+    item_scope::ItemScope,
+    keys,
+    nameres::CrateDefMap,
+    AssocItemId, DefWithBodyId, LocalModuleId, Lookup, ModuleDefId,
+};
+use hir_expand::{db::AstDatabase, InFile};
+use stdx::format_to;
+use syntax::{
+    algo,
+    ast::{self, AstNode},
+    SyntaxNode,
+};
+
+use crate::{
+    db::HirDatabase, display::HirDisplay, infer::TypeMismatch, test_db::TestDB, InferenceResult, Ty,
+};
+
+// These tests compare the inference results for all expressions in a file
+// against snapshots of the expected results using expect. Use
+// `env UPDATE_EXPECT=1 cargo test -p hir_ty` to update the snapshots.
+
+fn setup_tracing() -> tracing::subscriber::DefaultGuard {
+    use tracing_subscriber::{layer::SubscriberExt, EnvFilter, Registry};
+    use tracing_tree::HierarchicalLayer;
+    let filter = EnvFilter::from_env("CHALK_DEBUG");
+    let layer = HierarchicalLayer::default()
+        .with_indent_lines(true)
+        .with_ansi(false)
+        .with_indent_amount(2)
+        .with_writer(std::io::stderr);
+    let subscriber = Registry::default().with(filter).with(layer);
+    tracing::subscriber::set_default(subscriber)
+}
+
+fn check_types(ra_fixture: &str) {
+    check_types_impl(ra_fixture, false)
+}
+
+fn check_types_source_code(ra_fixture: &str) {
+    check_types_impl(ra_fixture, true)
+}
+
+fn check_types_impl(ra_fixture: &str, display_source: bool) {
+    let _tracing = setup_tracing();
+    let db = TestDB::with_files(ra_fixture);
+    let mut checked_one = false;
+    for (file_id, annotations) in db.extract_annotations() {
+        for (range, expected) in annotations {
+            let ty = type_at_range(&db, FileRange { file_id, range });
+            let actual = if display_source {
+                let module = db.module_for_file(file_id);
+                ty.display_source_code(&db, module).unwrap()
+            } else {
+                ty.display(&db).to_string()
+            };
+            assert_eq!(expected, actual);
+            checked_one = true;
+        }
+    }
+    assert!(checked_one, "no `//^` annotations found");
+}
+
+fn type_at_range(db: &TestDB, pos: FileRange) -> Ty {
+    let file = db.parse(pos.file_id).ok().unwrap();
+    let expr = algo::find_node_at_range::<ast::Expr>(file.syntax(), pos.range).unwrap();
+    let fn_def = expr.syntax().ancestors().find_map(ast::Fn::cast).unwrap();
+    let module = db.module_for_file(pos.file_id);
+    let func = *module.child_by_source(db)[keys::FUNCTION]
+        .get(&InFile::new(pos.file_id.into(), fn_def))
+        .unwrap();
+
+    let (_body, source_map) = db.body_with_source_map(func.into());
+    if let Some(expr_id) = source_map.node_expr(InFile::new(pos.file_id.into(), &expr)) {
+        let infer = db.infer(func.into());
+        return infer[expr_id].clone();
+    }
+    panic!("Can't find expression")
+}
+
+fn infer(ra_fixture: &str) -> String {
+    infer_with_mismatches(ra_fixture, false)
+}
+
+fn infer_with_mismatches(content: &str, include_mismatches: bool) -> String {
+    let _tracing = setup_tracing();
+    let (db, file_id) = TestDB::with_single_file(content);
+
+    let mut buf = String::new();
+
+    let mut infer_def = |inference_result: Arc<InferenceResult>,
+                         body_source_map: Arc<BodySourceMap>| {
+        let mut types: Vec<(InFile<SyntaxNode>, &Ty)> = Vec::new();
+        let mut mismatches: Vec<(InFile<SyntaxNode>, &TypeMismatch)> = Vec::new();
+
+        for (pat, ty) in inference_result.type_of_pat.iter() {
+            let syntax_ptr = match body_source_map.pat_syntax(pat) {
+                Ok(sp) => {
+                    let root = db.parse_or_expand(sp.file_id).unwrap();
+                    sp.map(|ptr| {
+                        ptr.either(
+                            |it| it.to_node(&root).syntax().clone(),
+                            |it| it.to_node(&root).syntax().clone(),
+                        )
+                    })
+                }
+                Err(SyntheticSyntax) => continue,
+            };
+            types.push((syntax_ptr, ty));
+        }
+
+        for (expr, ty) in inference_result.type_of_expr.iter() {
+            let node = match body_source_map.expr_syntax(expr) {
+                Ok(sp) => {
+                    let root = db.parse_or_expand(sp.file_id).unwrap();
+                    sp.map(|ptr| ptr.to_node(&root).syntax().clone())
+                }
+                Err(SyntheticSyntax) => continue,
+            };
+            types.push((node.clone(), ty));
+            if let Some(mismatch) = inference_result.type_mismatch_for_expr(expr) {
+                mismatches.push((node, mismatch));
+            }
+        }
+
+        // sort ranges for consistency
+        types.sort_by_key(|(node, _)| {
+            let range = node.value.text_range();
+            (range.start(), range.end())
+        });
+        for (node, ty) in &types {
+            let (range, text) = if let Some(self_param) = ast::SelfParam::cast(node.value.clone()) {
+                (self_param.self_token().unwrap().text_range(), "self".to_string())
+            } else {
+                (node.value.text_range(), node.value.text().to_string().replace("\n", " "))
+            };
+            let macro_prefix = if node.file_id != file_id.into() { "!" } else { "" };
+            format_to!(
+                buf,
+                "{}{:?} '{}': {}\n",
+                macro_prefix,
+                range,
+                ellipsize(text, 15),
+                ty.display(&db)
+            );
+        }
+        if include_mismatches {
+            mismatches.sort_by_key(|(node, _)| {
+                let range = node.value.text_range();
+                (range.start(), range.end())
+            });
+            for (src_ptr, mismatch) in &mismatches {
+                let range = src_ptr.value.text_range();
+                let macro_prefix = if src_ptr.file_id != file_id.into() { "!" } else { "" };
+                format_to!(
+                    buf,
+                    "{}{:?}: expected {}, got {}\n",
+                    macro_prefix,
+                    range,
+                    mismatch.expected.display(&db),
+                    mismatch.actual.display(&db),
+                );
+            }
+        }
+    };
+
+    let module = db.module_for_file(file_id);
+    let crate_def_map = db.crate_def_map(module.krate);
+
+    let mut defs: Vec<DefWithBodyId> = Vec::new();
+    visit_module(&db, &crate_def_map, module.local_id, &mut |it| defs.push(it));
+    defs.sort_by_key(|def| match def {
+        DefWithBodyId::FunctionId(it) => {
+            let loc = it.lookup(&db);
+            let tree = db.item_tree(loc.id.file_id);
+            tree.source(&db, loc.id).syntax().text_range().start()
+        }
+        DefWithBodyId::ConstId(it) => {
+            let loc = it.lookup(&db);
+            let tree = db.item_tree(loc.id.file_id);
+            tree.source(&db, loc.id).syntax().text_range().start()
+        }
+        DefWithBodyId::StaticId(it) => {
+            let loc = it.lookup(&db);
+            let tree = db.item_tree(loc.id.file_id);
+            tree.source(&db, loc.id).syntax().text_range().start()
+        }
+    });
+    for def in defs {
+        let (_body, source_map) = db.body_with_source_map(def);
+        let infer = db.infer(def);
+        infer_def(infer, source_map);
+    }
+
+    buf.truncate(buf.trim_end().len());
+    buf
+}
+
+fn visit_module(
+    db: &TestDB,
+    crate_def_map: &CrateDefMap,
+    module_id: LocalModuleId,
+    cb: &mut dyn FnMut(DefWithBodyId),
+) {
+    visit_scope(db, crate_def_map, &crate_def_map[module_id].scope, cb);
+    for impl_id in crate_def_map[module_id].scope.impls() {
+        let impl_data = db.impl_data(impl_id);
+        for &item in impl_data.items.iter() {
+            match item {
+                AssocItemId::FunctionId(it) => {
+                    let def = it.into();
+                    cb(def);
+                    let body = db.body(def);
+                    visit_scope(db, crate_def_map, &body.item_scope, cb);
+                }
+                AssocItemId::ConstId(it) => {
+                    let def = it.into();
+                    cb(def);
+                    let body = db.body(def);
+                    visit_scope(db, crate_def_map, &body.item_scope, cb);
+                }
+                AssocItemId::TypeAliasId(_) => (),
+            }
+        }
+    }
+
+    fn visit_scope(
+        db: &TestDB,
+        crate_def_map: &CrateDefMap,
+        scope: &ItemScope,
+        cb: &mut dyn FnMut(DefWithBodyId),
+    ) {
+        for decl in scope.declarations() {
+            match decl {
+                ModuleDefId::FunctionId(it) => {
+                    let def = it.into();
+                    cb(def);
+                    let body = db.body(def);
+                    visit_scope(db, crate_def_map, &body.item_scope, cb);
+                }
+                ModuleDefId::ConstId(it) => {
+                    let def = it.into();
+                    cb(def);
+                    let body = db.body(def);
+                    visit_scope(db, crate_def_map, &body.item_scope, cb);
+                }
+                ModuleDefId::StaticId(it) => {
+                    let def = it.into();
+                    cb(def);
+                    let body = db.body(def);
+                    visit_scope(db, crate_def_map, &body.item_scope, cb);
+                }
+                ModuleDefId::TraitId(it) => {
+                    let trait_data = db.trait_data(it);
+                    for &(_, item) in trait_data.items.iter() {
+                        match item {
+                            AssocItemId::FunctionId(it) => cb(it.into()),
+                            AssocItemId::ConstId(it) => cb(it.into()),
+                            AssocItemId::TypeAliasId(_) => (),
+                        }
+                    }
+                }
+                ModuleDefId::ModuleId(it) => visit_module(db, crate_def_map, it.local_id, cb),
+                _ => (),
+            }
+        }
+    }
+}
+
+fn ellipsize(mut text: String, max_len: usize) -> String {
+    if text.len() <= max_len {
+        return text;
+    }
+    let ellipsis = "...";
+    let e_len = ellipsis.len();
+    let mut prefix_len = (max_len - e_len) / 2;
+    while !text.is_char_boundary(prefix_len) {
+        prefix_len += 1;
+    }
+    let mut suffix_len = max_len - e_len - prefix_len;
+    while !text.is_char_boundary(text.len() - suffix_len) {
+        suffix_len += 1;
+    }
+    text.replace_range(prefix_len..text.len() - suffix_len, ellipsis);
+    text
+}
+
+#[test]
+fn typing_whitespace_inside_a_function_should_not_invalidate_types() {
+    let (mut db, pos) = TestDB::with_position(
+        "
+        //- /lib.rs
+        fn foo() -> i32 {
+            <|>1 + 1
+        }
+    ",
+    );
+    {
+        let events = db.log_executed(|| {
+            let module = db.module_for_file(pos.file_id);
+            let crate_def_map = db.crate_def_map(module.krate);
+            visit_module(&db, &crate_def_map, module.local_id, &mut |def| {
+                db.infer(def);
+            });
+        });
+        assert!(format!("{:?}", events).contains("infer"))
+    }
+
+    let new_text = "
+        fn foo() -> i32 {
+            1
+            +
+            1
+        }
+    "
+    .to_string();
+
+    db.set_file_text(pos.file_id, Arc::new(new_text));
+
+    {
+        let events = db.log_executed(|| {
+            let module = db.module_for_file(pos.file_id);
+            let crate_def_map = db.crate_def_map(module.krate);
+            visit_module(&db, &crate_def_map, module.local_id, &mut |def| {
+                db.infer(def);
+            });
+        });
+        assert!(!format!("{:?}", events).contains("infer"), "{:#?}", events)
+    }
+}
+
+fn check_infer(ra_fixture: &str, expect: Expect) {
+    let mut actual = infer(ra_fixture);
+    actual.push('\n');
+    expect.assert_eq(&actual);
+}
+
+fn check_infer_with_mismatches(ra_fixture: &str, expect: Expect) {
+    let mut actual = infer_with_mismatches(ra_fixture, true);
+    actual.push('\n');
+    expect.assert_eq(&actual);
+}