feat(lexer): supports tag

3 files changed, 6 insertions, 1 deletions

diff --git a/grammar.ebnf b/grammar.ebnf
index 76c124c..d443a9d 100644
--- a/grammar.ebnf
+++ b/grammar.ebnf
@@ -25,3 +25,4 @@ code-inline = "`", content, "`";
 math-inline = "$", content, "$";
 link = "[", [ content ], "](", content, ")";
 ref = "<", content, ">";
+tag = "#", ? [^\n ]+ ?;
diff --git a/src/lexer/lexed.zig b/src/lexer/lexed.zig
index cb3a4b7..63395bb 100644
--- a/src/lexer/lexed.zig
+++ b/src/lexer/lexed.zig
@@ -18,6 +18,7 @@ pub const Kind = enum {
     callout,
     list_ordored,
     list_unordored,
+    tag,
 };
 
 pub const Lexed = struct {
diff --git a/src/lexer/lexer.zig b/src/lexer/lexer.zig
index 873d40b..e2a4f7b 100644
--- a/src/lexer/lexer.zig
+++ b/src/lexer/lexer.zig
@@ -50,7 +50,10 @@ pub const Lexer = struct {
                         _ = self.iter.nextCodepoint();
                         break;
                     }
-                    current_kind = .literal;
+                    current_kind = switch (current_kind.?) {
+                        .title => if (acc.items.len == 1) .tag else .literal,
+                        else => .literal,
+                    };
                 }
             }
         }