From c9318e046c44fd3c161ff1253eb41c108e4733e3 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Fri, 2 Feb 2018 22:08:14 +0300
Subject: G: extern functions

---
 src/parser/event_parser/grammar/items/mod.rs | 43 +++++++++++++++++++++++++---
 src/syntax_kinds.rs                          | 20 +++++++------
 2 files changed, 51 insertions(+), 12 deletions(-)

(limited to 'src')

diff --git a/src/parser/event_parser/grammar/items/mod.rs b/src/parser/event_parser/grammar/items/mod.rs
index 4d8783735..a6d8f375c 100644
--- a/src/parser/event_parser/grammar/items/mod.rs
+++ b/src/parser/event_parser/grammar/items/mod.rs
@@ -19,18 +19,36 @@ fn item(p: &mut Parser) {
     visibility(p);
     let la = p.nth(1);
     let item_kind = match p.current() {
+        USE_KW => {
+            use_item(p);
+            USE_ITEM
+        }
         EXTERN_KW if la == CRATE_KW => {
             extern_crate_item(p);
             EXTERN_CRATE_ITEM
         }
+        EXTERN_KW => {
+            abi(p);
+            match p.current() {
+                FN_KW => {
+                    fn_item(p);
+                    FN_ITEM
+                }
+                L_CURLY => {
+                    extern_block(p);
+                    EXTERN_BLOCK
+                }
+                _ => {
+                    item.abandon(p);
+                    p.error().message("expected `fn` or `{`").emit();
+                    return;
+                }
+            }
+        }
         MOD_KW => {
             mod_item(p);
             MOD_ITEM
         }
-        USE_KW => {
-            use_item(p);
-            USE_ITEM
-        }
         STRUCT_KW => {
             structs::struct_item(p);
             STRUCT_ITEM
@@ -155,6 +173,12 @@ fn mod_item(p: &mut Parser) {
     }
 }
 
+fn extern_block(p: &mut Parser) {
+    assert!(p.at(L_CURLY));
+    p.bump();
+    p.expect(R_CURLY);
+}
+
 pub(super) fn is_use_tree_start(kind: SyntaxKind) -> bool {
     kind == STAR || kind == L_CURLY
 }
@@ -225,6 +249,17 @@ fn use_item(p: &mut Parser) {
     }
 }
 
+fn abi(p: &mut Parser) {
+    assert!(p.at(EXTERN_KW));
+    let abi = p.start();
+    p.bump();
+    match p.current() {
+        STRING | RAW_STRING => p.bump(),
+        _ => (),
+    }
+    abi.complete(p, ABI);
+}
+
 fn fn_item(p: &mut Parser) {
     assert!(p.at(FN_KW));
     p.bump();
diff --git a/src/syntax_kinds.rs b/src/syntax_kinds.rs
index cd4c753a9..7577fa037 100644
--- a/src/syntax_kinds.rs
+++ b/src/syntax_kinds.rs
@@ -82,15 +82,16 @@ pub enum SyntaxKind {
     FILE,
     STRUCT_ITEM,
     ENUM_ITEM,
+    FN_ITEM,
+    EXTERN_CRATE_ITEM,
+    MOD_ITEM,
+    USE_ITEM,
+    EXTERN_BLOCK,
     ENUM_VARIANT,
     NAMED_FIELD,
     POS_FIELD,
-    FN_ITEM,
-    EXTERN_CRATE_ITEM,
     ATTR,
     META_ITEM,
-    MOD_ITEM,
-    USE_ITEM,
     USE_TREE,
     PATH,
     PATH_SEGMENT,
@@ -100,6 +101,7 @@ pub enum SyntaxKind {
     TYPE_PARAM_LIST,
     LIFETIME_PARAM,
     TYPE_PARAM,
+    ABI,
 
     // Technical SyntaxKinds: they appear temporally during parsing,
     // but never end up in the final tree
@@ -189,15 +191,16 @@ impl SyntaxKind {
             FILE => &SyntaxInfo { name: "FILE" },
             STRUCT_ITEM => &SyntaxInfo { name: "STRUCT_ITEM" },
             ENUM_ITEM => &SyntaxInfo { name: "ENUM_ITEM" },
+            FN_ITEM => &SyntaxInfo { name: "FN_ITEM" },
+            EXTERN_CRATE_ITEM => &SyntaxInfo { name: "EXTERN_CRATE_ITEM" },
+            MOD_ITEM => &SyntaxInfo { name: "MOD_ITEM" },
+            USE_ITEM => &SyntaxInfo { name: "USE_ITEM" },
+            EXTERN_BLOCK => &SyntaxInfo { name: "EXTERN_BLOCK" },
             ENUM_VARIANT => &SyntaxInfo { name: "ENUM_VARIANT" },
             NAMED_FIELD => &SyntaxInfo { name: "NAMED_FIELD" },
             POS_FIELD => &SyntaxInfo { name: "POS_FIELD" },
-            FN_ITEM => &SyntaxInfo { name: "FN_ITEM" },
-            EXTERN_CRATE_ITEM => &SyntaxInfo { name: "EXTERN_CRATE_ITEM" },
             ATTR => &SyntaxInfo { name: "ATTR" },
             META_ITEM => &SyntaxInfo { name: "META_ITEM" },
-            MOD_ITEM => &SyntaxInfo { name: "MOD_ITEM" },
-            USE_ITEM => &SyntaxInfo { name: "USE_ITEM" },
             USE_TREE => &SyntaxInfo { name: "USE_TREE" },
             PATH => &SyntaxInfo { name: "PATH" },
             PATH_SEGMENT => &SyntaxInfo { name: "PATH_SEGMENT" },
@@ -207,6 +210,7 @@ impl SyntaxKind {
             TYPE_PARAM_LIST => &SyntaxInfo { name: "TYPE_PARAM_LIST" },
             LIFETIME_PARAM => &SyntaxInfo { name: "LIFETIME_PARAM" },
             TYPE_PARAM => &SyntaxInfo { name: "TYPE_PARAM" },
+            ABI => &SyntaxInfo { name: "ABI" },
 
             TOMBSTONE => &SyntaxInfo { name: "TOMBSTONE" },
             EOF => &SyntaxInfo { name: "EOF" },
-- 
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