1 files changed, 75 insertions, 0 deletions

diff --git a/src/parser/event_parser/grammar/type_params.rs b/src/parser/event_parser/grammar/type_params.rs
new file mode 100644
index 000000000..12c9a5362
--- /dev/null
+++ b/src/parser/event_parser/grammar/type_params.rs
@@ -0,0 +1,75 @@
+use super::*;
+
+pub(super) fn list(p: &mut Parser) {
+    if !p.at(L_ANGLE) {
+        return;
+    }
+    let m = p.start();
+    p.bump();
+
+    while !p.at(EOF) && !p.at(R_ANGLE) {
+        match p.current() {
+            LIFETIME => lifetime_param(p),
+            IDENT => type_param(p),
+            _ => p.err_and_bump("expected type parameter"),
+        }
+        if !p.at(R_ANGLE) && !p.expect(COMMA) {
+            break;
+        }
+    }
+    p.expect(R_ANGLE);
+    m.complete(p, TYPE_PARAM_LIST);
+
+    fn lifetime_param(p: &mut Parser) {
+        assert!(p.at(LIFETIME));
+        let m = p.start();
+        p.bump();
+        if p.eat(COLON) {
+            while p.at(LIFETIME) {
+                p.bump();
+                if !p.eat(PLUS) {
+                    break;
+                }
+            }
+        }
+        m.complete(p, LIFETIME_PARAM);
+    }
+
+    fn type_param(p: &mut Parser) {
+        assert!(p.at(IDENT));
+        let m = p.start();
+        p.bump();
+        if p.eat(COLON) {
+            loop {
+                let has_paren = p.eat(L_PAREN);
+                p.eat(QUESTION);
+                if p.at(FOR_KW) {
+                    //TODO
+                }
+                if p.at(LIFETIME) {
+                    p.bump();
+                } else if paths::is_path_start(p) {
+                    paths::type_path(p);
+                } else {
+                    break;
+                }
+                if has_paren {
+                    p.expect(R_PAREN);
+                }
+                if !p.eat(PLUS) {
+                    break;
+                }
+            }
+        }
+        if p.at(EQ) {
+            types::type_ref(p)
+        }
+        m.complete(p, TYPE_PARAM);
+    }
+}
+
+pub(super) fn where_clause(p: &mut Parser) {
+    if p.at(WHERE_KW) {
+        p.bump();
+    }
+}