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diff --git a/Userland/Libraries/LibSyntax/Highlighter.h b/Userland/Libraries/LibSyntax/Highlighter.h
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+++ b/Userland/Libraries/LibSyntax/Highlighter.h
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+/*
+ * Copyright (c) 2020-2021, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/Noncopyable.h>
+#include <AK/WeakPtr.h>
+#include <LibGUI/TextDocument.h>
+#include <LibGfx/Palette.h>
+
+namespace Syntax {
+
+enum class Language {
+    PlainText,
+    Cpp,
+    JavaScript,
+    INI,
+    GML,
+    Shell,
+};
+
+struct TextStyle {
+    const Gfx::Color color;
+    const bool bold { false };
+};
+
+class Highlighter {
+    AK_MAKE_NONCOPYABLE(Highlighter);
+    AK_MAKE_NONMOVABLE(Highlighter);
+
+public:
+    virtual ~Highlighter();
+
+    virtual Language language() const = 0;
+    virtual void rehighlight(Gfx::Palette) = 0;
+    virtual void highlight_matching_token_pair();
+
+    virtual bool is_identifier(void*) const { return false; };
+    virtual bool is_navigatable(void*) const { return false; };
+
+    void attach(GUI::TextEditor& editor);
+    void detach();
+    void cursor_did_change();
+
+protected:
+    Highlighter() { }
+
+    WeakPtr<GUI::TextEditor> m_editor;
+
+    struct MatchingTokenPair {
+        void* open;
+        void* close;
+    };
+
+    virtual Vector<MatchingTokenPair> matching_token_pairs() const = 0;
+    virtual bool token_types_equal(void*, void*) const = 0;
+
+    struct BuddySpan {
+        int index { -1 };
+        GUI::TextDocumentSpan span_backup;
+    };
+
+    bool m_has_brace_buddies { false };
+    BuddySpan m_brace_buddies[2];
+};
+
+}