1 files changed, 178 insertions, 0 deletions

diff --git a/crates/parser/src/grammar/items/adt.rs b/crates/parser/src/grammar/items/adt.rs
new file mode 100644
index 000000000..addfb59d4
--- /dev/null
+++ b/crates/parser/src/grammar/items/adt.rs
@@ -0,0 +1,178 @@
+//! FIXME: write short doc here
+
+use super::*;
+
+pub(super) fn struct_def(p: &mut Parser, m: Marker) {
+    assert!(p.at(T![struct]));
+    p.bump(T![struct]);
+    struct_or_union(p, m, T![struct], STRUCT);
+}
+
+pub(super) fn union_def(p: &mut Parser, m: Marker) {
+    assert!(p.at_contextual_kw("union"));
+    p.bump_remap(T![union]);
+    struct_or_union(p, m, T![union], UNION);
+}
+
+fn struct_or_union(p: &mut Parser, m: Marker, kw: SyntaxKind, def: SyntaxKind) {
+    name_r(p, ITEM_RECOVERY_SET);
+    type_params::opt_type_param_list(p);
+    match p.current() {
+        T![where] => {
+            type_params::opt_where_clause(p);
+            match p.current() {
+                T![;] => {
+                    p.bump(T![;]);
+                }
+                T!['{'] => record_field_def_list(p),
+                _ => {
+                    //FIXME: special case `(` error message
+                    p.error("expected `;` or `{`");
+                }
+            }
+        }
+        T![;] if kw == T![struct] => {
+            p.bump(T![;]);
+        }
+        T!['{'] => record_field_def_list(p),
+        T!['('] if kw == T![struct] => {
+            tuple_field_def_list(p);
+            // test tuple_struct_where
+            // struct Test<T>(T) where T: Clone;
+            // struct Test<T>(T);
+            type_params::opt_where_clause(p);
+            p.expect(T![;]);
+        }
+        _ if kw == T![struct] => {
+            p.error("expected `;`, `{`, or `(`");
+        }
+        _ => {
+            p.error("expected `{`");
+        }
+    }
+    m.complete(p, def);
+}
+
+pub(super) fn enum_def(p: &mut Parser, m: Marker) {
+    assert!(p.at(T![enum]));
+    p.bump(T![enum]);
+    name_r(p, ITEM_RECOVERY_SET);
+    type_params::opt_type_param_list(p);
+    type_params::opt_where_clause(p);
+    if p.at(T!['{']) {
+        enum_variant_list(p);
+    } else {
+        p.error("expected `{`")
+    }
+    m.complete(p, ENUM);
+}
+
+pub(crate) fn enum_variant_list(p: &mut Parser) {
+    assert!(p.at(T!['{']));
+    let m = p.start();
+    p.bump(T!['{']);
+    while !p.at(EOF) && !p.at(T!['}']) {
+        if p.at(T!['{']) {
+            error_block(p, "expected enum variant");
+            continue;
+        }
+        let var = p.start();
+        attributes::outer_attributes(p);
+        if p.at(IDENT) {
+            name(p);
+            match p.current() {
+                T!['{'] => record_field_def_list(p),
+                T!['('] => tuple_field_def_list(p),
+                _ => (),
+            }
+
+            // test variant_discriminant
+            // enum E { X(i32) = 10 }
+            if p.eat(T![=]) {
+                expressions::expr(p);
+            }
+            var.complete(p, VARIANT);
+        } else {
+            var.abandon(p);
+            p.err_and_bump("expected enum variant");
+        }
+        if !p.at(T!['}']) {
+            p.expect(T![,]);
+        }
+    }
+    p.expect(T!['}']);
+    m.complete(p, VARIANT_LIST);
+}
+
+pub(crate) fn record_field_def_list(p: &mut Parser) {
+    assert!(p.at(T!['{']));
+    let m = p.start();
+    p.bump(T!['{']);
+    while !p.at(T!['}']) && !p.at(EOF) {
+        if p.at(T!['{']) {
+            error_block(p, "expected field");
+            continue;
+        }
+        record_field_def(p);
+        if !p.at(T!['}']) {
+            p.expect(T![,]);
+        }
+    }
+    p.expect(T!['}']);
+    m.complete(p, RECORD_FIELD_LIST);
+
+    fn record_field_def(p: &mut Parser) {
+        let m = p.start();
+        // test record_field_attrs
+        // struct S {
+        //     #[serde(with = "url_serde")]
+        //     pub uri: Uri,
+        // }
+        attributes::outer_attributes(p);
+        opt_visibility(p);
+        if p.at(IDENT) {
+            name(p);
+            p.expect(T![:]);
+            types::type_(p);
+            m.complete(p, RECORD_FIELD);
+        } else {
+            m.abandon(p);
+            p.err_and_bump("expected field declaration");
+        }
+    }
+}
+
+fn tuple_field_def_list(p: &mut Parser) {
+    assert!(p.at(T!['(']));
+    let m = p.start();
+    if !p.expect(T!['(']) {
+        return;
+    }
+    while !p.at(T![')']) && !p.at(EOF) {
+        let m = p.start();
+        // test tuple_field_attrs
+        // struct S (
+        //     #[serde(with = "url_serde")]
+        //     pub Uri,
+        // );
+        //
+        // enum S {
+        //     Uri(#[serde(with = "url_serde")] Uri),
+        // }
+        attributes::outer_attributes(p);
+        opt_visibility(p);
+        if !p.at_ts(types::TYPE_FIRST) {
+            p.error("expected a type");
+            m.complete(p, ERROR);
+            break;
+        }
+        types::type_(p);
+        m.complete(p, TUPLE_FIELD);
+
+        if !p.at(T![')']) {
+            p.expect(T![,]);
+        }
+    }
+    p.expect(T![')']);
+    m.complete(p, TUPLE_FIELD_LIST);
+}