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diff --git a/server/lexer/details/parse.hpp b/server/lexer/details/parse.hpp
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+++ b/server/lexer/details/parse.hpp
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+// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "math-server" project.
+// For details, see https://github.com/egor-tensin/math-server.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include "../token_type.hpp"
+
+#include <optional>
+#include <string_view>
+
+namespace math::server::lexer::details {
+
+// Exposed for testing:
+std::string_view parse_whitespace(const std::string_view&);
+std::optional<double> parse_number(const std::string_view&, std::string_view&);
+std::optional<double> parse_number(const std::string_view&);
+std::optional<token::Type> parse_const_token(const std::string_view&, std::string_view&);
+std::optional<token::Type> parse_const_token(const std::string_view&);
+
+}