LibGLSL: Add initial GLSL parser implementation

Userland/Libraries/LibGLSL/Token.cpp

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2023, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "Token.h"
+#include <AK/String.h>
+
+namespace GLSL {
+
+bool Position::operator<(Position const& other) const
+{
+    return line < other.line || (line == other.line && column < other.column);
+}
+
+bool Position::operator>(Position const& other) const
+{
+    return !(*this < other) && !(*this == other);
+}
+
+bool Position::operator==(Position const& other) const
+{
+    return line == other.line && column == other.column;
+}
+
+bool Position::operator<=(Position const& other) const
+{
+    return !(*this > other);
+}
+
+ErrorOr<String> Token::to_string() const
+{
+    return String::formatted("{}  {}:{}-{}:{} ({})", type_to_string(m_type), start().line, start().column, end().line, end().column, text());
+}
+
+ErrorOr<String> Token::type_as_string() const
+{
+    auto str = type_to_string(m_type);
+    auto view = StringView(str, strlen(str));
+    return String::from_utf8(view);
+}
+
+}