From 9f87c9a3f927d3b7a3cbb92818c45c979ece693b Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Tue, 31 Jul 2018 17:35:54 +0300
Subject: Field expr

---
 src/parser/grammar/expressions.rs | 43 +++++++++++++++++++++++++++++++++++----
 1 file changed, 39 insertions(+), 4 deletions(-)

(limited to 'src/parser/grammar')

diff --git a/src/parser/grammar/expressions.rs b/src/parser/grammar/expressions.rs
index 11bb3436b..3956df568 100644
--- a/src/parser/grammar/expressions.rs
+++ b/src/parser/grammar/expressions.rs
@@ -26,11 +26,20 @@ pub(super) fn literal(p: &mut Parser) -> Option<CompletedMarker> {
 }
 
 pub(super) fn expr(p: &mut Parser) {
-    let mut lhs = prefix_expr(p);
+    let mut lhs = match prefix_expr(p) {
+        Some(lhs) => lhs,
+        None => return,
+    };
 
-    while let Some(m) = lhs {
-        match p.current() {
-            L_PAREN => lhs = Some(call_expr(p, m)),
+    loop {
+        lhs = match p.current() {
+            L_PAREN => call_expr(p, lhs),
+            DOT if p.nth(1) == IDENT =>
+                if p.nth(2) == L_PAREN {
+                    method_call_expr(p, lhs)
+                } else {
+                    field_expr(p, lhs)
+                }
             _ => break,
         }
     }
@@ -95,6 +104,32 @@ fn call_expr(p: &mut Parser, lhs: CompletedMarker) -> CompletedMarker {
     m.complete(p, CALL_EXPR)
 }
 
+// test method_call_expr
+// fn foo() {
+//     x.foo();
+//     y.bar(1, 2,);
+// }
+fn method_call_expr(p: &mut Parser, lhs: CompletedMarker) -> CompletedMarker {
+    assert!(p.at(DOT) && p.nth(1) == IDENT && p.nth(2) == L_PAREN);
+    let m = lhs.precede(p);
+    p.bump();
+    p.bump();
+    arg_list(p);
+    m.complete(p, METHOD_CALL_EXPR)
+}
+
+// test field_expr
+// fn foo() {
+//     x.foo.bar;
+// }
+fn field_expr(p: &mut Parser, lhs: CompletedMarker) -> CompletedMarker {
+    assert!(p.at(DOT) && p.nth(1) == IDENT);
+    let m = lhs.precede(p);
+    p.bump();
+    p.bump();
+    m.complete(p, FIELD_EXPR)
+}
+
 fn arg_list(p: &mut Parser) {
     assert!(p.at(L_PAREN));
     let m = p.start();
-- 
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