ini is only three letters away from owo

src/common/utils/ini.cpp

@@ -1,2 +1,150 @@
 #include "ini.hpp"
+using namespace sosc::ini;
 
+File* File::Open
+    (const std::string& filename, const std::vector<Rule>& rules)
+{
+    auto ini = new File;
+    ini->filename = filename;
+    std::ifstream file;
+
+    file.open(filename);
+    if(!file.is_open())
+        throw LoadError(ini, -1,
+            "Could not open file."
+        );
+
+    int line_number = 0;
+    std::string line, tmp;
+    File::SectionList::Section* active_section = nullptr;
+    while(std::getline(file, line)) {
+        ++line_number;
+        str::trim(&line);
+        if(line == "")
+            continue;
+        if(line[0] == ';')
+            continue;
+
+        if(line[0] == '[') {
+            str::tolower(&line);
+            if(line[line.length() - 1] != ']' || line.length() == 2)
+                throw LoadError(ini, line_number,
+                    "Section header must begin with [ and end with ]."
+                );
+
+            tmp = line.substr(1, line.length() - 2);
+            if(ini->section_lists.count(tmp) == 0)
+                ini->section_lists[tmp] = SectionList();
+
+            auto sections = &(ini->section_lists[tmp].sections);
+            sections->push_back(SectionList::Section());
+            active_section = &((*sections)[sections->size() - 1]);
+        } else {
+            if(active_section == nullptr)
+                throw LoadError(ini, line_number,
+                    "Key-value pair field must be after section header."
+                );
+
+            auto parts = str::split(line, '=', 2);
+            if(parts.size() < 2)
+                throw LoadError(ini, line_number,
+                    "Key-value pair field must be separated by '='."
+                );
+
+            str::tolower(str::trim(&(parts[0])));
+            str::trim(&(parts[1]));
+
+            if(parts[0] == "" || active_section->values.count(parts[0]) == 0)
+                throw LoadError(ini, line_number,
+                    "Duplicate key-value pair field in section."
+                );
+
+            active_section->values[parts[0]] = parts[1];
+        }
+    }
+
+    for(auto& rule : rules) {
+        if(rule.required && ini->section_lists.count(rule.name) == 0)
+            throw LoadError(ini, -1, str::join({
+                "Required section '", rule.name, "' not found."
+            }));
+
+        if(!rule.allow_multiple && ini[rule.name].sections.size() > 1)
+            throw LoadError(ini, -1, str::join({
+                "Multiple instances of '", rule.name, "' section "
+                "when explicitely not allowed."
+            }));
+
+        for(auto& section : ini[rule.name].sections) {
+            for(auto &field : rule.required_fields) {
+                str::tolower(&field.name);
+                if(section.values.count(field.name) == 0)
+                    throw LoadError(ini, -1, str::join({
+                        "Required field '", field.name, "' in section '",
+                        rule.name, "' not found."
+                    }));
+
+                if(!field.Test())
+                    throw LoadError(ini, -1, str::join({
+                        "Field '", field.name, "' in section '",rule.name, "' "
+                        "cannot be casted to requested type."
+                    }));
+            }
+        }
+    }
+
+    return ini;
+}
+
+std::runtime_error File::LoadError
+    (File* file, int line, const std::string &error)
+{
+    delete file;
+    if(line > 0)
+        return std::runtime_error(str::join(
+            {"LOAD ERROR IN '", file->filename, "' L", TOSTR(line), ": ", error}
+        ));
+    else
+        return std::runtime_error(str::join(
+            {"LOAD ERROR IN '", file->filename, "': ", error}
+        ));
+}
+
+const File::SectionList&
+    File::operator[] (std::string name) const
+{
+    str::tolower(&name);
+    if(this->section_lists.count(name) > 0)
+        return this->section_lists[name];
+    else
+        throw std::range_error("Section name not found.");
+}
+
+const std::string&
+    File::SectionList::operator[] (std::string key) const
+{
+    return this->sections[0][key];
+}
+
+const File::SectionList::Section&
+    File::SectionList::operator[] (int index) const
+{
+    if(index < sections.size())
+        return this->sections[index];
+    else
+        throw std::range_error("Section index out-of-bounds.");
+}
+
+const std::string&
+    File::SectionList::Section::operator[] (std::string key) const
+{
+    str::tolower(&key);
+    if(this->values.count(key) > 0)
+        return this->values[key];
+    else
+        throw std::range_error("Key not found in section.");
+}
+
+void File::Close() {
+    delete this;
+}

src/common/utils/ini.hpp

@@ -1,20 +1,73 @@
 #ifndef SOSC_UTIL_INI_H
 #define SOSC_UTIL_INI_H
 
+#include <typeinfo>
+#include <fstream>
+#include <sstream>
 #include <vector>
 #include <map>
 
+#include "string.hpp"
+
 namespace sosc {
 namespace ini {
 class File {
 public:
+    struct Proxy {
+        std::string value;
+        Proxy(const std::string& value) : value(value) {};
+
+        explicit operator bool() const {
+            if(this->value == "1" || this->value == "true")
+                return true;
+            else if(this->value == "0" || this->value == "false")
+                return false;
+            else
+                throw std::bad_cast();
+        }
+
+        template<
+            typename T,
+            typename Decayed = typename std::decay<T>::type,
+            typename = typename std::enable_if<
+                !std::is_same<const char*, Decayed>::value
+             && !std::is_same<std::allocator<char>, Decayed>::value
+             && !std::is_same<std::initializer_list<char>, Decayed>::value
+            >::type
+        > explicit operator T() {
+            std::stringstream ss;
+            ss << this->value;
+
+            T retval;
+            if(!(ss >> retval))
+                throw std::bad_cast();
+            else
+                return retval;
+        }
+    };
+
     struct Rule {
+        template<typename T = std::string>
+        struct Field {
+            Field(const std::string& name) : name(name) {}
+            bool Test() {
+                try {
+                    (T)Proxy(this->name);
+                    return true;
+                } catch(...) {
+                    return false;
+                }
+            }
+
+            std::string name;
+        };
+
         Rule() = delete;
         Rule(
             const std::string& name,
             bool required,
             bool allow_multiple,
-            const std::vector<std::string>& required_fields
+            const std::vector<Field>& required_fields
         ) : name(name),
             required(required),
             allow_multiple(allow_multiple),
@@ -23,14 +76,43 @@ public:
         std::string name;
         bool required;
         bool allow_multiple;
-        std::vector<std::string> required_fields;
+        std::vector<Field> required_fields;
     };
 
+    class SectionList {
+    public:
         class Section {
+        public:
+            const std::string& operator[] (std::string key) const;
+        private:
+            Section() = default;
 
+            std::map<std::string, std::string> values;
+            friend class File;
         };
+
+        const std::string& operator[] (std::string key) const;
+        const Section& operator[] (int index) const;
+    private:
+        SectionList() = default;
+
+        std::vector<Section> sections;
+        friend class File;
+    };
+
+    File(const File&) = delete;
+    static File* Open
+        (const std::string& filename, const std::vector<Rule>& rules = {});
+    void Close();
+
+    const SectionList& operator[] (std::string name) const;
 private:
-    std::map<std::string, Section>
+    File() = default;
+    static std::runtime_error LoadError
+        (File* file, int line, const std::string& error);
+
+    std::string filename;
+    std::map<std::string, SectionList> section_lists;
 };
 }}
 

src/common/utils/string.cpp

@@ -73,6 +73,12 @@ std::vector<std::string> sosc::str::split
     return parts;
 }
 
+std::string sosc::str::join
+    (const std::vector<std::string>& parts, int count)
+{
+    return join(parts, "", count);
+}
+
 std::string sosc::str::join(const std::vector<std::string>& parts,
     char delimiter, int count)
 {

src/common/utils/string.hpp

@@ -30,6 +30,7 @@ std::vector<std::string> split
 std::vector<std::string> split
     (const std::string& str, std::string delimiter, int count = -1);
 
+std::string join(const std::vector<std::string>& parts, int count = -1);
 std::string join(const std::vector<std::string>& parts, 
     char delimiter, int count = -1);
 std::string join(const std::vector<std::string>& parts, 

src/server/main.cpp

@@ -3,10 +3,11 @@
 #include <ctime>
 #include <thread>
 
-#include "utils/string.hpp"
 #include "db/database.hpp"
 #include "hosts/master.hpp"
 #include "hosts/slave.hpp"
+#include "utils/ini.hpp"
+#include "utils/string.hpp"
 
 template<class T, class U>
 struct _server_ctx {
@@ -42,6 +43,12 @@ int main(int argc, char **argv) {
     if(argc < 2)
         return -1;
 
+    auto test = ini::File::Open("test.ini", {
+        ini::File::Rule("test section", true, false, {
+            ini::File::Rule::Field<bool>("test")
+        }),
+    });
+
     if(argv[1][0] == 'm') {
         if(!db::init_databases(nullptr))
             return -1;