From c119e8fd8b0106bb2e031e76ac1be89bd10a0674 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Sun, 4 Feb 2018 17:06:00 +0300
Subject: G: unsafe fn

---
 src/parser/grammar/items/mod.rs | 92 ++++++++++++++++++++++++++++-------------
 src/parser/parser.rs            |  6 +--
 2 files changed, 67 insertions(+), 31 deletions(-)

(limited to 'src')

diff --git a/src/parser/grammar/items/mod.rs b/src/parser/grammar/items/mod.rs
index 4afe2e418..588fca4c6 100644
--- a/src/parser/grammar/items/mod.rs
+++ b/src/parser/grammar/items/mod.rs
@@ -81,38 +81,74 @@ fn item(p: &mut Parser) {
                 CONST_ITEM
             }
         },
-        // test unsafe_trait
-        // unsafe trait T {}
-        UNSAFE_KW if la == TRAIT_KW => {
+        UNSAFE_KW => {
             p.bump();
-            traits::trait_item(p);
-            TRAIT_ITEM
-        }
+            let la = p.nth(1);
+            match p.current() {
+                // test unsafe_trait
+                // unsafe trait T {}
+                TRAIT_KW => {
+                    traits::trait_item(p);
+                    TRAIT_ITEM
+                }
 
-        // test unsafe_auto_trait
-        // unsafe auto trait T {}
-        UNSAFE_KW if p.at_kw(1, "auto") && p.nth(2) == TRAIT_KW => {
-            p.bump();
-            p.bump_remap(AUTO_KW);
-            traits::trait_item(p);
-            TRAIT_ITEM
-        }
+                // test unsafe_auto_trait
+                // unsafe auto trait T {}
+                IDENT if p.at_kw("auto") && la == TRAIT_KW => {
+                    p.bump_remap(AUTO_KW);
+                    traits::trait_item(p);
+                    TRAIT_ITEM
+                }
 
-        // test unsafe_impl
-        // unsafe impl Foo {}
-        UNSAFE_KW if la == IMPL_KW => {
-            p.bump();
-            traits::impl_item(p);
-            IMPL_ITEM
-        }
+                // test unsafe_impl
+                // unsafe impl Foo {}
+                IMPL_KW => {
+                    traits::impl_item(p);
+                    IMPL_ITEM
+                }
 
-        // test unsafe_default_impl
-        // unsafe default impl Foo {}
-        UNSAFE_KW if p.at_kw(1, "default") && p.nth(2) == IMPL_KW => {
-            p.bump();
-            p.bump_remap(DEFAULT_KW);
-            traits::impl_item(p);
-            IMPL_ITEM
+                // test unsafe_default_impl
+                // unsafe default impl Foo {}
+                IDENT if p.at_kw("default") && la == IMPL_KW => {
+                    p.bump_remap(DEFAULT_KW);
+                    traits::impl_item(p);
+                    IMPL_ITEM
+                }
+
+                // test unsafe_extern_fn
+                // unsafe extern "C" fn foo() {}
+                EXTERN_KW => {
+                    abi(p);
+                    if !p.at(FN_KW) {
+                        item.abandon(p);
+                        p.error().message("expected function").emit();
+                        return
+                    }
+                    fn_item(p);
+                    FN_ITEM
+                }
+
+                // test unsafe_fn
+                // unsafe fn foo() {}
+                FN_KW => {
+                    fn_item(p);
+                    FN_ITEM
+                }
+
+                t => {
+                    item.abandon(p);
+                    let message = "expected `trait`, `impl` or `fn`";
+
+                    // test unsafe_block_in_mod
+                    // fn foo(){} unsafe { } fn bar(){}
+                    if t == L_CURLY {
+                        error_block(p, message);
+                    } else {
+                        p.error().message(message).emit();
+                    }
+                    return;
+                }
+            }
         }
 
         MOD_KW => {
diff --git a/src/parser/parser.rs b/src/parser/parser.rs
index 7e1b22ee5..53a116fb7 100644
--- a/src/parser/parser.rs
+++ b/src/parser/parser.rs
@@ -1,6 +1,6 @@
 use super::Event;
 use super::input::{InputPosition, ParserInput};
-use SyntaxKind::{self, EOF, TOMBSTONE, IDENT};
+use SyntaxKind::{self, EOF, TOMBSTONE};
 
 pub(crate) struct Marker {
     pos: u32,
@@ -161,8 +161,8 @@ impl<'t> Parser<'t> {
         self.inp.kind(self.pos + n)
     }
 
-    pub(crate) fn at_kw(&self, n: u32, t: &str) -> bool {
-        self.nth(n) == IDENT && self.inp.text(self.pos + n) == t
+    pub(crate) fn at_kw(&self, t: &str) -> bool {
+        self.inp.text(self.pos) == t
     }
 
     pub(crate) fn current(&self) -> SyntaxKind {
-- 
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