From 0eaa2a420cb699cdb23ce9b1573560a5d9e59a31 Mon Sep 17 00:00:00 2001
From: Nathan Reiner <nathan@nathanreiner.xyz>
Date: Wed, 5 Aug 2026 09:08:24 +0200
Subject: add regex literals

---
 src/z/parser/js/grammar/literal.zig | 37 +++++++++++++++++++++++++++++++++----
 1 file changed, 33 insertions(+), 4 deletions(-)

(limited to 'src/z/parser/js/grammar/literal.zig')

diff --git a/src/z/parser/js/grammar/literal.zig b/src/z/parser/js/grammar/literal.zig
index 039ebf4..71b990d 100644
--- a/src/z/parser/js/grammar/literal.zig
+++ b/src/z/parser/js/grammar/literal.zig
@@ -24,6 +24,9 @@ pub const Literal = union(enum) {
 
             var token = lexer.start(.{ .literal = undefined });
 
+            const regex_possible = lexer.context.regex_possible;
+            lexer.context.regex_possible = false;
+
             switch (try lexer.consume()) {
                 '0'...'9', '.' => |c| {
                     const base = if (c != '0') 10 else switch (lexer.peekChar() orelse 0) {
@@ -69,7 +72,7 @@ pub const Literal = union(enum) {
                     while (true) {
                         switch (try lexer.consume()) {
                             quote => break,
-                            '\\' => try lexer.consume(),
+                            '\\' => try lexer.skip(),
                             else => {},
                         }
                     }
@@ -83,11 +86,12 @@ pub const Literal = union(enum) {
                                 token.kind.literal.template = .whole;
                                 break;
                             },
-                            '\\' => try lexer.consume(),
+                            '\\' => try lexer.skip(),
                             '$' => if (lexer.peekChar() == '{') {
                                 lexer.skip() catch unreachable;
                                 lexer.context.template_nesting += 1;
                                 token.kind.literal.template = .start;
+                                lexer.context.regex_possible = true;
                                 break;
                             },
                             else => {},
@@ -104,17 +108,28 @@ pub const Literal = union(enum) {
                                 token.kind.literal.template = .end;
                                 break;
                             },
-                            '\\' => try lexer.consume(),
+                            '\\' => try lexer.skip(),
                             '$' => if (lexer.peekChar() == '{') {
                                 lexer.skip() catch unreachable;
                                 lexer.context.template_nesting += 1;
                                 token.kind.literal.template = .middle;
+                                lexer.context.regex_possible = true;
                                 break;
                             },
                             else => {},
                         }
                     }
-                },
+                } else return Lexer.Error.UnexpectedToken,
+                '/' => if (regex_possible) {
+                    while (true) {
+                        switch (try lexer.consume()) {
+                            '/' => break,
+                            '\\' => try lexer.skip(),
+                            '\n' => return Lexer.Error.UnexpectedToken,
+                            else => {},
+                        }
+                    }
+                } else return Lexer.Error.UnexpectedToken,
                 else => return Lexer.Error.UnexpectedToken,
             }
 
@@ -159,3 +174,17 @@ test "string" {
         Simple.run("'hello", 0),
     );
 }
+
+test "regex" {
+    const Simple = struct {
+        pub fn run(comptime buffer: []const u8, n: usize) !void {
+            comptime var lexer: Lexer = .init(buffer);
+            try Literal.tokenize(&lexer);
+            try std.testing.expectEqual(1, lexer.tokens.len);
+            try std.testing.expectEqual(n, lexer.tokens[0].slice.len);
+        }
+    };
+
+    try Simple.run("/hello/", 7);
+    try Simple.run("/some string\\/ here/", 20);
+}
-- 
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