From c244dd10343ff96a73879c593bd9253c4073cb90 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Tue, 31 Jul 2018 12:26:19 +0300
Subject: Call expr

---
 src/parser/grammar/attributes.rs  |  4 +--
 src/parser/grammar/expressions.rs | 61 ++++++++++++++++++++++++++++++---------
 src/parser/grammar/mod.rs         |  2 +-
 3 files changed, 50 insertions(+), 17 deletions(-)

(limited to 'src/parser/grammar')

diff --git a/src/parser/grammar/attributes.rs b/src/parser/grammar/attributes.rs
index 7f1c0401a..c411d4d7f 100644
--- a/src/parser/grammar/attributes.rs
+++ b/src/parser/grammar/attributes.rs
@@ -36,7 +36,7 @@ fn meta_item(p: &mut Parser) {
         match p.current() {
             EQ => {
                 p.bump();
-                if !expressions::literal(p) {
+                if expressions::literal(p).is_none() {
                     p.error("expected literal");
                 }
             }
@@ -56,7 +56,7 @@ fn meta_item_arg_list(p: &mut Parser) {
         match p.current() {
             EOF | R_PAREN => break,
             IDENT => meta_item(p),
-            c => if !expressions::literal(p) {
+            c => if expressions::literal(p).is_none() {
                 let message = "expected attribute";
 
                 if items::ITEM_FIRST.contains(c) {
diff --git a/src/parser/grammar/expressions.rs b/src/parser/grammar/expressions.rs
index ece698248..92aaafa3d 100644
--- a/src/parser/grammar/expressions.rs
+++ b/src/parser/grammar/expressions.rs
@@ -13,39 +13,72 @@ use super::*;
 //     let _ = b"e";
 //     let _ = br"f";
 // }
-pub(super) fn literal(p: &mut Parser) -> bool {
+pub(super) fn literal(p: &mut Parser) -> Option<CompletedMarker> {
     match p.current() {
         TRUE_KW | FALSE_KW | INT_NUMBER | FLOAT_NUMBER | BYTE | CHAR | STRING | RAW_STRING
         | BYTE_STRING | RAW_BYTE_STRING => {
-            let lit = p.start();
+            let m = p.start();
             p.bump();
-            lit.complete(p, LITERAL);
-            true
+            Some(m.complete(p, LITERAL))
         }
-        _ => false,
+        _ => None,
     }
 }
 
 pub(super) fn expr(p: &mut Parser) {
-    if literal(p) {
-        return;
+    let mut lhs = atom_expr(p);
+
+    while let Some(m) = lhs {
+        match p.current() {
+            L_PAREN => lhs = Some(call_expr(p, m)),
+            _ => break,
+        }
+    }
+}
+
+fn atom_expr(p: &mut Parser) -> Option<CompletedMarker> {
+    match literal(p) {
+        Some(m) => return Some(m),
+        None => (),
     }
     if paths::is_path_start(p) {
-        return path_expr(p);
+        return Some(path_expr(p));
     }
 
     match p.current() {
-        L_PAREN => tuple_expr(p),
-        _ => p.error("expected expression"),
+        L_PAREN => Some(tuple_expr(p)),
+        _ => {
+            p.error("expected expression");
+            None
+        }
     }
 }
 
-fn tuple_expr(p: &mut Parser) {
+fn tuple_expr(p: &mut Parser) -> CompletedMarker {
     assert!(p.at(L_PAREN));
     let m = p.start();
     p.expect(L_PAREN);
     p.expect(R_PAREN);
-    m.complete(p, TUPLE_EXPR);
+    m.complete(p, TUPLE_EXPR)
+}
+
+// test call_expr
+// fn foo() {
+//     let _ = f();
+//     let _ = f()(1)(1, 2,);
+// }
+fn call_expr(p: &mut Parser, lhs: CompletedMarker) -> CompletedMarker {
+    assert!(p.at(L_PAREN));
+    let m = lhs.precede(p);
+    p.bump();
+    while !p.at(R_PAREN) && !p.at(EOF) {
+        expr(p);
+        if !p.at(R_PAREN) && !p.expect(COMMA) {
+            break;
+        }
+    }
+    p.eat(R_PAREN);
+    m.complete(p, CALL_EXPR)
 }
 
 // test path_expr
@@ -54,9 +87,9 @@ fn tuple_expr(p: &mut Parser) {
 //     let _ = a::b;
 //     let _ = ::a::<b>;
 // }
-fn path_expr(p: &mut Parser) {
+fn path_expr(p: &mut Parser) -> CompletedMarker {
     assert!(paths::is_path_start(p));
     let m = p.start();
     paths::expr_path(p);
-    m.complete(p, PATH_EXPR);
+    m.complete(p, PATH_EXPR)
 }
diff --git a/src/parser/grammar/mod.rs b/src/parser/grammar/mod.rs
index e4823eadb..63ad2782e 100644
--- a/src/parser/grammar/mod.rs
+++ b/src/parser/grammar/mod.rs
@@ -31,7 +31,7 @@ mod type_args;
 mod types;
 
 use {
-    parser::{parser::Parser, token_set::TokenSet},
+    parser::{parser::{Parser, CompletedMarker}, token_set::TokenSet},
     SyntaxKind::{self, *},
 };
 
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