G: type item

grammar.ron

@@ -26,6 +26,7 @@ Grammar(
         "static",
         "mut",
         "unsafe",
+        "type",
     ],
     contextual_keywords: [
         "auto",
@@ -98,6 +99,7 @@ Grammar(
         "CONST_ITEM",
         "TRAIT_ITEM",
         "IMPL_ITEM",
+        "TYPE_ITEM",
 
         "EXTERN_BLOCK",
         "ENUM_VARIANT",

src/parser/grammar/items/mod.rs

@@ -150,7 +150,14 @@ fn item(p: &mut Parser) {
                 }
             }
         }
-
+        FN_KW => {
+            fn_item(p);
+            FN_ITEM
+        }
+        TYPE_KW => {
+            type_item(p);
+            TYPE_ITEM
+        }
         MOD_KW => {
             mod_item(p);
             MOD_ITEM
@@ -163,10 +170,6 @@ fn item(p: &mut Parser) {
             structs::enum_item(p);
             ENUM_ITEM
         }
-        FN_KW => {
-            fn_item(p);
-            FN_ITEM
-        }
         L_CURLY => {
             item.abandon(p);
             error_block(p, "expected item");
@@ -203,29 +206,6 @@ fn extern_block(p: &mut Parser) {
     p.expect(R_CURLY);
 }
 
-fn mod_item(p: &mut Parser) {
-    assert!(p.at(MOD_KW));
-    p.bump();
-
-    if p.expect(IDENT) && !p.eat(SEMI) {
-        if p.expect(L_CURLY) {
-            mod_contents(p, true);
-            p.expect(R_CURLY);
-        }
-    }
-}
-
-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();
@@ -248,3 +228,47 @@ fn fn_item(p: &mut Parser) {
         p.expect(R_PAREN);
     }
 }
+
+// test type_item
+// type Foo = Bar;
+fn type_item(p: &mut Parser) {
+    assert!(p.at(TYPE_KW));
+    p.bump();
+
+    p.expect(IDENT);
+
+    // test type_item_type_params
+    // type Result<T> = ();
+    type_params::list(p);
+
+    // test type_item_where_clause
+    // type Foo where Foo: Copy = ();
+    type_params::where_clause(p);
+
+    p.expect(EQ);
+    types::type_ref(p);
+    p.expect(SEMI);
+}
+
+fn mod_item(p: &mut Parser) {
+    assert!(p.at(MOD_KW));
+    p.bump();
+
+    if p.expect(IDENT) && !p.eat(SEMI) {
+        if p.expect(L_CURLY) {
+            mod_contents(p, true);
+            p.expect(R_CURLY);
+        }
+    }
+}
+
+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);
+}

src/parser/grammar/type_params.rs

@@ -71,5 +71,8 @@ pub(super) fn list(p: &mut Parser) {
 pub(super) fn where_clause(p: &mut Parser) {
     if p.at(WHERE_KW) {
         p.bump();
+        p.expect(IDENT);
+        p.expect(COLON);
+        p.expect(IDENT);
     }
 }

src/parser/grammar/types.rs

@@ -1,5 +1,14 @@
 use super::*;
 
 pub(super) fn type_ref(p: &mut Parser) {
-    p.expect(IDENT);
+    match p.current() {
+        IDENT => p.bump(),
+        L_PAREN => {
+            p.bump();
+            p.expect(R_PAREN);
+        }
+        _ => {
+            p.error("expected type");
+        }
+    }
 }

src/syntax_kinds.rs

@@ -83,6 +83,7 @@ pub enum SyntaxKind {
     STATIC_KW,
     MUT_KW,
     UNSAFE_KW,
+    TYPE_KW,
     AUTO_KW,
     DEFAULT_KW,
     UNION_KW,
@@ -97,6 +98,7 @@ pub enum SyntaxKind {
     CONST_ITEM,
     TRAIT_ITEM,
     IMPL_ITEM,
+    TYPE_ITEM,
     EXTERN_BLOCK,
     ENUM_VARIANT,
     NAMED_FIELD,
@@ -203,6 +205,7 @@ impl SyntaxKind {
             STATIC_KW => &SyntaxInfo { name: "STATIC_KW" },
             MUT_KW => &SyntaxInfo { name: "MUT_KW" },
             UNSAFE_KW => &SyntaxInfo { name: "UNSAFE_KW" },
+            TYPE_KW => &SyntaxInfo { name: "TYPE_KW" },
             AUTO_KW => &SyntaxInfo { name: "AUTO_KW" },
             DEFAULT_KW => &SyntaxInfo { name: "DEFAULT_KW" },
             UNION_KW => &SyntaxInfo { name: "UNION_KW" },
@@ -217,6 +220,7 @@ impl SyntaxKind {
             CONST_ITEM => &SyntaxInfo { name: "CONST_ITEM" },
             TRAIT_ITEM => &SyntaxInfo { name: "TRAIT_ITEM" },
             IMPL_ITEM => &SyntaxInfo { name: "IMPL_ITEM" },
+            TYPE_ITEM => &SyntaxInfo { name: "TYPE_ITEM" },
             EXTERN_BLOCK => &SyntaxInfo { name: "EXTERN_BLOCK" },
             ENUM_VARIANT => &SyntaxInfo { name: "ENUM_VARIANT" },
             NAMED_FIELD => &SyntaxInfo { name: "NAMED_FIELD" },
@@ -268,6 +272,7 @@ pub(crate) fn ident_to_keyword(ident: &str) -> Option<SyntaxKind> {
         "static" => Some(STATIC_KW),
         "mut" => Some(MUT_KW),
         "unsafe" => Some(UNSAFE_KW),
+        "type" => Some(TYPE_KW),
         _ => None,
     }
 }

tests/data/lexer/0011_keywords.rs

@@ -1,3 +1,3 @@
 fn use struct trait enum impl true false as extern crate
 mod pub self super in where for loop while if match const
-static mut
+static mut type

tests/data/lexer/0011_keywords.txt

@@ -47,4 +47,6 @@ WHITESPACE 1 "\n"
 STATIC_KW 6 "static"
 WHITESPACE 1 " "
 MUT_KW 3 "mut"
+WHITESPACE 1 " "
+TYPE_KW 4 "type"
 WHITESPACE 1 "\n"

tests/data/parser/inline/0014_type_item_type_params.rs

@@ -0,0 +1 @@
+type Result<T> = ();

tests/data/parser/inline/0014_type_item_type_params.txt

@@ -0,0 +1,17 @@
+FILE@[0; 21)
+  TYPE_ITEM@[0; 21)
+    TYPE_KW@[0; 4)
+    WHITESPACE@[4; 5)
+    IDENT@[5; 11) "Result"
+    TYPE_PARAM_LIST@[11; 15)
+      L_ANGLE@[11; 12)
+      TYPE_PARAM@[12; 13)
+        IDENT@[12; 13) "T"
+      R_ANGLE@[13; 14)
+      WHITESPACE@[14; 15)
+    EQ@[15; 16)
+    WHITESPACE@[16; 17)
+    L_PAREN@[17; 18)
+    R_PAREN@[18; 19)
+    SEMI@[19; 20)
+    WHITESPACE@[20; 21)

tests/data/parser/inline/0015_type_item.rs

@@ -0,0 +1 @@
+type Foo = Bar;

tests/data/parser/inline/0015_type_item.txt

@@ -0,0 +1,11 @@
+FILE@[0; 16)
+  TYPE_ITEM@[0; 16)
+    TYPE_KW@[0; 4)
+    WHITESPACE@[4; 5)
+    IDENT@[5; 8) "Foo"
+    WHITESPACE@[8; 9)
+    EQ@[9; 10)
+    WHITESPACE@[10; 11)
+    IDENT@[11; 14) "Bar"
+    SEMI@[14; 15)
+    WHITESPACE@[15; 16)

tests/data/parser/inline/0016_type_item_where_clause.rs

@@ -0,0 +1 @@
+type Foo where Foo: Copy = ();

tests/data/parser/inline/0016_type_item_where_clause.txt

@@ -0,0 +1,19 @@
+FILE@[0; 31)
+  TYPE_ITEM@[0; 31)
+    TYPE_KW@[0; 4)
+    WHITESPACE@[4; 5)
+    IDENT@[5; 8) "Foo"
+    WHITESPACE@[8; 9)
+    WHERE_KW@[9; 14)
+    WHITESPACE@[14; 15)
+    IDENT@[15; 18) "Foo"
+    COLON@[18; 19)
+    WHITESPACE@[19; 20)
+    IDENT@[20; 24) "Copy"
+    WHITESPACE@[24; 25)
+    EQ@[25; 26)
+    WHITESPACE@[26; 27)
+    L_PAREN@[27; 28)
+    R_PAREN@[28; 29)
+    SEMI@[29; 30)
+    WHITESPACE@[30; 31)

tests/testutils/src/lib.rs

@@ -76,15 +76,14 @@ fn test_from_dir(dir: &Path) -> Vec<PathBuf> {
 fn print_difference(expected: &str, actual: &str, path: &Path) {
     let dir = project_dir();
     let path = path.strip_prefix(&dir).unwrap_or_else(|_| path);
-    println!("\nfile: {}", path.display());
     if expected.trim() == actual.trim() {
-        println!("whitespace difference");
+        println!("whitespace difference, rewriting");
-        println!("rewriting the file");
         file::put_text(path, actual).unwrap();
     } else {
         let changeset = Changeset::new(actual, expected, "\n");
-        println!("{}", changeset);
+        print!("{}", changeset);
     }
+    println!("file: {}\n", path.display());
     panic!("Comparison failed")
 }