LibCMake+LibSyntax: Add a CMake syntax highlighter

Userland/Libraries/LibCMake/SyntaxHighlighter.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2023, Sam Atkins <atkinssj@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibSyntax/Highlighter.h>
+
+namespace CMake {
+
+class SyntaxHighlighter final : public Syntax::Highlighter {
+public:
+    SyntaxHighlighter() = default;
+    virtual ~SyntaxHighlighter() override = default;
+
+    virtual bool is_identifier(u64) const override;
+
+    virtual Syntax::Language language() const override { return Syntax::Language::CMake; }
+    virtual Optional<StringView> comment_prefix() const override { return "#"sv; }
+    virtual Optional<StringView> comment_suffix() const override { return {}; }
+    virtual void rehighlight(Palette const&) override;
+
+protected:
+    virtual Vector<MatchingTokenPair> matching_token_pairs_impl() const override;
+    virtual bool token_types_equal(u64, u64) const override;
+};
+
+}