From 00863566ec4601c65c435b74e575d49546a1c707 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Sat, 7 Dec 2019 03:36:21 +0300
Subject: 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.
---
 server/lexer/input.hpp | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 server/lexer/input.hpp

(limited to 'server/lexer/input.hpp')

diff --git a/server/lexer/input.hpp b/server/lexer/input.hpp
new file mode 100644
index 0000000..1104a4b
--- /dev/null
+++ b/server/lexer/input.hpp
@@ -0,0 +1,42 @@
+#pragma once
+
+#include "error.hpp"
+
+#include <cstddef>
+
+#include <string_view>
+
+namespace math::server::lexer {
+
+class Input {
+public:
+    explicit Input(const std::string_view& input)
+        : m_pos{0}, m_input{input}
+    { }
+
+    const std::string_view& get_input() const { return m_input; }
+
+    std::size_t get_pos() const { return m_pos; }
+
+    std::size_t get_length() const { return m_input.length(); }
+
+    bool empty() const { return m_input.empty(); }
+
+    void consume(std::size_t len) {
+        if (m_input.length() < len) {
+            throw LexerError{"internal: not enough input to consume"};
+        }
+        m_pos += len;
+        m_input.remove_prefix(len);
+    }
+
+    void consume(const std::string_view& sub) {
+        consume(sub.length());
+    }
+
+private:
+    std::size_t m_pos;
+    std::string_view m_input;
+};
+
+}
-- 
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