More symbols

grammar.ron

@@ -25,5 +25,10 @@ Grammar(
         "COLON",
         "COLONCOLON",
         "DOLLAR",
+        "EQ",
+        "EQEQ",
+        "FAT_ARROW",
+        "NEQ",
+        "NOT",
     ]
 )

src/lexer/mod.rs

@@ -52,6 +52,8 @@ fn next_token_inner(c: char, ptr: &mut Ptr) -> SyntaxKind {
         '~' => return TILDE,
         '?' => return QUESTION,
         '$' => return DOLLAR,
+
+        // Multi-byte tokens.
         '.' => return match (ptr.next(), ptr.nnext()) {
             (Some('.'), Some('.')) => {
                 ptr.bump();
@@ -76,6 +78,24 @@ fn next_token_inner(c: char, ptr: &mut Ptr) -> SyntaxKind {
             }
             _ => COLON
         },
+        '=' => return match ptr.next() {
+            Some('=') => {
+                ptr.bump();
+                EQEQ
+            }
+            Some('>') => {
+                ptr.bump();
+                FAT_ARROW
+            }
+            _ => EQ,
+        },
+        '!' => return match ptr.next() {
+            Some('=') => {
+                ptr.bump();
+                NEQ
+            }
+            _ => NOT,
+        },
         _ => (),
     }
     ERROR

src/syntax_kinds.rs

@@ -26,8 +26,13 @@ pub const QUESTION: SyntaxKind = SyntaxKind(21);
 pub const COLON: SyntaxKind = SyntaxKind(22);
 pub const COLONCOLON: SyntaxKind = SyntaxKind(23);
 pub const DOLLAR: SyntaxKind = SyntaxKind(24);
+pub const EQ: SyntaxKind = SyntaxKind(25);
+pub const EQEQ: SyntaxKind = SyntaxKind(26);
+pub const FAT_ARROW: SyntaxKind = SyntaxKind(27);
+pub const NEQ: SyntaxKind = SyntaxKind(28);
+pub const NOT: SyntaxKind = SyntaxKind(29);
 
-static INFOS: [SyntaxInfo; 25] = [
+static INFOS: [SyntaxInfo; 30] = [
     SyntaxInfo { name: "ERROR" },
     SyntaxInfo { name: "IDENT" },
     SyntaxInfo { name: "UNDERSCORE" },
@@ -53,6 +58,11 @@ static INFOS: [SyntaxInfo; 25] = [
     SyntaxInfo { name: "COLON" },
     SyntaxInfo { name: "COLONCOLON" },
     SyntaxInfo { name: "DOLLAR" },
+    SyntaxInfo { name: "EQ" },
+    SyntaxInfo { name: "EQEQ" },
+    SyntaxInfo { name: "FAT_ARROW" },
+    SyntaxInfo { name: "NEQ" },
+    SyntaxInfo { name: "NOT" },
 ];
 
 pub(crate) fn syntax_info(kind: SyntaxKind) -> &'static SyntaxInfo {

tests/data/lexer/0005_symbols.rs

@@ -1,3 +1,5 @@
 ; , ( ) { } [ ] @ # ~ ? $
 . .. ... ..=
 : ::
+= =>
+! !=

tests/data/lexer/0005_symbols.txt

@@ -35,3 +35,11 @@ WHITESPACE 1 "\n"
 COLON 1 ":"
 WHITESPACE 1 " "
 COLONCOLON 2 "::"
+WHITESPACE 1 "\n"
+EQ 1 "="
+WHITESPACE 1 " "
+FAT_ARROW 2 "=>"
+WHITESPACE 1 "\n"
+NOT 1 "!"
+WHITESPACE 1 " "
+NEQ 2 "!="