C++ Parser Lua file config

Just a basic mini library for parsing simple files that only have variables written and with Lua extension.

Note: At the moment this parser is only for variables, I have not yet implemented the table and metatable parser in Lua.

It is a parser without running Lua, that is, without using the PUC-RIO Lua libraries.

I decided to start this project because I haven't seen any similar without using additional libraries, only C++. If you want to contribute to the implementation of tables and metatables, feel free to modify and send a pull request.

Features and News

Installation

git clone https://github.com/terroo/cpp-lua-parsing
cd cpp-lua-parsing/
sudo make install

You can also use cpplua.hpp file without installing, just copying and including in your project.

Use

Suppose you have a file in Lua with only variable names and values for them.

And that file can be with spaces, comments and blank lines, and want to use as a "mini database", example:

cat file.lua

-- file configuration for game
position = 18.3
name = "Strike Man The Biggest of The World" -- use name capitalize and spaces
color = #554477
skin = "Dragon"
-- for more configs add here
        after = true
result = 935


news = "information"

Basic use

Print the entire file, but ignoring spaces and comments. This basic code would be:

vim main.cpp

Include cpp-lua-parsing:

#include <cpp-lua-parsing/cpplua.hpp>

If you haven't installed it and want to use it separately, just: #include "cpplua.hpp".

Instantiate the luaparsing class inside the cpp namespace

cpp::luaparsing luapp;

Initialize and declare the luafile member for your .lua file (must be .lua) or the full path to it:

luapp.luafile = "file.lua";

Print member function readluafile():

Full main.cpp code:

#include "cpplua.hpp"

int main(){
  cpp::luaparsing luapp;
  luapp.luafile = "file.lua";
  std::cout << luapp.readluafile();
}

Compile: g++ main.cpp -o luaparsing . After running ./luaparsing the formatted output of the example file will be:

position = 18.3
name = Strike Man The Biggest of The World 
color = #554477
skin = Dragon
after = true
result = 935
news = information

Get the value of a specific variable

Use member function: get_value_from_key()

#include <cpp-lua-parsing/cpplua.hpp>

int main( int argc , char **argv ){
  cpp::luaparsing luapp;
  luapp.luafile = "./resources/file.lua";
  std::cout << luapp.get_value_from_key("color") << '\n';
}

The output will be: #554477

Knowing which variable has a certain value

Use member function: get_key_from_value()

#include "cpplua.hpp"

int main( int argc , char **argv ){
  cpp::luaparsing luapp;
  luapp.luafile = "./resources/file.lua";
  std::cout << luapp.get_key_from_value("Dragon") << '\n';
}

Output: skin .

NOTE: get_key_from_value() ≠ get_value_from_key()

Uninstall

sudo make uninstall

Contribute! Issues: https://github.com/terroo/cpp-lua-parsing/issues

tiagomelojuca/cpp-lua-parsing