split server into multiple components

In a vague attempt to make header files more readable, split server/
into a number of components.
Also, refactor the unit tests to use the "Data-driven test cases" of
Boost.Test.

1 files changed, 49 insertions, 0 deletions

diff --git a/server/lexer/token.hpp b/server/lexer/token.hpp
new file mode 100644
index 0000000..6f98383
--- /dev/null
+++ b/server/lexer/token.hpp
@@ -0,0 +1,49 @@
+#pragma once
+
+#include "token_type.hpp"
+
+#include <cstddef>
+
+#include <string_view>
+#include <utility>
+#include <variant>
+
+namespace math::server::lexer {
+
+class Token {
+public:
+    using Type = token::Type;
+
+    explicit Token(token::Type type);
+    explicit Token(double value);
+
+    bool operator==(const Token& other) const;
+    bool operator!=(const Token& other) const { return !(*this == other); }
+
+    Type get_type() const { return m_type; }
+
+    double as_number() const;
+
+private:
+    token::Type m_type;
+    std::variant<double> m_value;
+
+    friend std::ostream& operator<<(std::ostream&, const Token&);
+};
+
+class ParsedToken : public Token {
+public:
+    ParsedToken(Token&& token, std::size_t pos, const std::string_view& view)
+        : Token{std::move(token)}, m_pos{pos}, m_view{view} {
+    }
+
+    std::size_t get_pos() const { return m_pos; }
+
+    std::size_t get_length() const { return m_view.length(); }
+
+private:
+    std::size_t m_pos;
+    std::string_view m_view;
+};
+
+}