LIP.lua

--[[
	Copyright (c) 2012 Carreras Nicolas

	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
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	The above copyright notice and this permission notice shall be included in all
	copies or substantial portions of the Software.

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	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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	SOFTWARE.
--]]
--- Lua INI Parser.
-- It has never been that simple to use INI files with Lua.
--@author Dynodzzo
---Modified by ConstaChymic

local LIP = {};

--does the actual work of converting the data to a table
local function convertToTable (iterator)
	local data = {};
	local section;
	for line in iterator do
		local tempSection = line:match('^%[([^%[%]]*)%]$');
		if(tempSection)then
			section = tonumber(tempSection) and tonumber(tempSection) or tempSection;
			data[section] = data[section] or {};
		end
		local param, value = line:match('^([%w|_]+)%s-=%s-(.+)$');
		if(param and value ~= nil)then
			if(tonumber(value))then
				value = tonumber(value);
			elseif(value == 'true')then
				value = true;
			elseif(value == 'false')then
				value = false;
			end
			if(tonumber(param))then
				param = tonumber(param);
			end
			data[section][param] = value;
		end
	end
	return data;
end

--- Returns a table containing all the data from the INI file.
--@param fileName The name of the INI file to parse. [string]
--@return The table containing all data from the INI file. [table]
function LIP.load(fileName)
	assert(type(fileName) == 'string', 'Parameter "fileName" must be a string.');
	local file = assert(io.open(fileName, 'r'), 'Error loading file : ' .. fileName);
	local data = convertToTable(file:lines())
	file:close();
	return data;
end

--- Returns a table containing all the data from the INI file.
--- Same as load, but you just pass the file directly rather than the path.
--@param fileName The name of the INI file to parse. [string]
--@return The table containing all data from the INI file. [table]
function LIP.loadFile(file)
	local f = file:lines()
	local data = convertToTable(f)
	file:close()
	return data;
end

--- Returns a table containing all the data from the INI file.
--- Same as load, except takes an ini string rather than a file
--@param iniString The INI file as a string to load. [string]
--@return The table containing all data from the INI file. [table]
function LIP.loadString(iniString)
	assert(type(iniString) == 'string', 'Parameter "iniString" must be a string.');
	iniString = iniString:gsub("\r\n", "\n");
	return convertToTable(string.gmatch(iniString, "([^\n]+)"))
end

--- Converts the given table to an INI string
--@param data The table containing all the data to store. [table]
function LIP.buildString(data, isfile)
    assert(type(data) == 'table', 'Parameter "data" must be a table.');
    local rline = isfile and '\r\n' or '\n'
    local contents = '';
    for section, param in pairs(data) do
        contents = contents .. ('[%s]\n'):format(section);
        for key, value in pairs(param) do
            contents = contents .. ('%s=%s\n'):format(key, tostring(value));
        end
        contents = contents .. rline;
    end
    return contents;
end

--- Saves all the data from a table to an INI file.
--@param fileName The name of the INI file to fill. [string]
--@param data The table containing all the data to store. [table]
function LIP.save(fileName, data)
    assert(type(fileName) == 'string', 'Parameter "fileName" must be a string.');
    local file = assert(io.open(fileName, 'w+b'), 'Error loading file :' .. fileName);
    file:write(LIP.buildString(data, true));
    file:close();
end

return LIP;