Add slackware package database parser

katja/database.cpp

@@ -0,0 +1,67 @@
+#include "katja/database.hpp"
+
+namespace katja
+{
+    database_package database_package::create_database_package(const std::string& fullname)
+    {
+        std::string::const_reverse_iterator begin_iterator = std::crbegin(fullname);
+        std::string::const_reverse_iterator end_iterator = begin_iterator;
+        int minus_counter = 0;
+
+        std::string build_tag;
+        std::string architecture;
+        std::string version;
+
+        for (; begin_iterator != std::crend(fullname) && minus_counter < 3; ++begin_iterator)
+        {
+            if (*begin_iterator == '-')
+            {
+                if (minus_counter == 0)
+                {
+                    build_tag = std::string(begin_iterator.base(), end_iterator.base());
+                }
+                else if (minus_counter == 1)
+                {
+                    architecture = std::string(begin_iterator.base(), end_iterator.base());
+                }
+                else if (minus_counter == 2)
+                {
+                    version = std::string(begin_iterator.base(), end_iterator.base());
+                }
+                end_iterator = begin_iterator + 1;
+                ++minus_counter;
+            }
+        }
+        return database_package(std::string(fullname.cbegin(), end_iterator.base()),
+                std::move(version), std::move(architecture), std::move(build_tag));
+    }
+
+    database_package::database_package(std::string&& name, std::string&& version,
+                std::string&& architecture, std::string&& build_tag)
+        : name(name), version(version), architecture(version), build_tag(build_tag)
+    {
+    }
+
+    database_package::database_package(const std::string& fullname)
+        : database_package(create_database_package(fullname))
+    {
+    }
+
+    std::string database_package::to_string() const
+    {
+        std::string package_string;
+        const std::size_t total_size = this->name.size() + this->version.size()
+            + this->architecture.size() + this->build_tag.size() + 3;
+
+        package_string.reserve(total_size);
+        package_string.append(this->name);
+        package_string.push_back('-');
+        package_string.append(this->version);
+        package_string.push_back('-');
+        package_string.append(this->architecture);
+        package_string.push_back('-');
+        package_string.append(this->build_tag);
+
+        return package_string;
+    }
+}