From 5ea7e5fb7ab9f9ed762c8b5220ba01a29796a871 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Tue, 9 Jan 2018 23:32:18 +0300
Subject: G: simplest use items

---
 src/parser/event_parser/grammar/items.rs |  8 +++++++-
 src/parser/event_parser/grammar/mod.rs   |  9 ++-------
 src/parser/event_parser/grammar/paths.rs | 15 +++++++++++++++
 3 files changed, 24 insertions(+), 8 deletions(-)
 create mode 100644 src/parser/event_parser/grammar/paths.rs

(limited to 'src/parser/event_parser/grammar')

diff --git a/src/parser/event_parser/grammar/items.rs b/src/parser/event_parser/grammar/items.rs
index e775db14b..950e02a4d 100644
--- a/src/parser/event_parser/grammar/items.rs
+++ b/src/parser/event_parser/grammar/items.rs
@@ -12,7 +12,7 @@ pub(super) fn mod_contents(p: &mut Parser) {
 
 fn item_first(p: &Parser) -> bool {
     match p.current() {
-        STRUCT_KW | FN_KW | EXTERN_KW | MOD_KW => true,
+        STRUCT_KW | FN_KW | EXTERN_KW | MOD_KW | USE_KW => true,
         _ => false,
     }
 }
@@ -43,6 +43,7 @@ fn item(p: &mut Parser) -> bool {
     // || node_if(p, TYPE_KW, TYPE_ITEM, type_item)
     node_if(p, [EXTERN_KW, CRATE_KW], EXTERN_CRATE_ITEM, extern_crate_item)
         || node_if(p, MOD_KW, MOD_ITEM, mod_item)
+        || node_if(p, USE_KW, USE_ITEM, use_item)
         || node_if(p, STRUCT_KW, STRUCT_ITEM, struct_item)
         || node_if(p, FN_KW, FN_ITEM, fn_item)
 }
@@ -66,6 +67,11 @@ fn mod_item(p: &mut Parser) {
     p.curly_block(mod_contents);
 }
 
+fn use_item(p: &mut Parser) {
+    paths::use_path(p);
+    p.expect(SEMI);
+}
+
 fn struct_field(p: &mut Parser) -> bool {
     node_if(p, IDENT, STRUCT_FIELD, |p| {
         p.expect(COLON) && p.expect(IDENT);
diff --git a/src/parser/event_parser/grammar/mod.rs b/src/parser/event_parser/grammar/mod.rs
index 6d1cd7ec3..60458ce70 100644
--- a/src/parser/event_parser/grammar/mod.rs
+++ b/src/parser/event_parser/grammar/mod.rs
@@ -6,10 +6,11 @@ use syntax_kinds::*;
 mod items;
 mod attributes;
 mod expressions;
+mod paths;
 
 pub(crate) fn file(p: &mut Parser) {
     node(p, FILE, |p| {
-        p.optional(SHEBANG);
+        p.eat(SHEBANG);
         items::mod_contents(p);
     })
 }
@@ -99,12 +100,6 @@ impl<'p> Parser<'p> {
         }
     }
 
-    fn optional(&mut self, kind: SyntaxKind) {
-        if self.current() == kind {
-            self.bump();
-        }
-    }
-
     fn eat(&mut self, kind: SyntaxKind) -> bool {
         self.current() == kind && { self.bump(); true }
     }
diff --git a/src/parser/event_parser/grammar/paths.rs b/src/parser/event_parser/grammar/paths.rs
new file mode 100644
index 000000000..96966b380
--- /dev/null
+++ b/src/parser/event_parser/grammar/paths.rs
@@ -0,0 +1,15 @@
+use super::*;
+
+pub(crate) fn use_path(p: &mut Parser) {
+    if !AnyOf(&[IDENT, COLONCOLON]).is_ahead(p) {
+        return;
+    }
+    node(p, PATH, |p| {
+        p.eat(COLONCOLON);
+        path_segment(p);
+    })
+}
+
+fn path_segment(p: &mut Parser) -> bool {
+    node_if(p, IDENT, PATH_SEGMENT, |p| ())
+}
\ No newline at end of file
-- 
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